WO2001077151A2 - Nouvelles molecules de proteines et d'acide nucleique fdrg et utilisation desdites molecules - Google Patents

Nouvelles molecules de proteines et d'acide nucleique fdrg et utilisation desdites molecules Download PDF

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WO2001077151A2
WO2001077151A2 PCT/US2001/011400 US0111400W WO0177151A2 WO 2001077151 A2 WO2001077151 A2 WO 2001077151A2 US 0111400 W US0111400 W US 0111400W WO 0177151 A2 WO0177151 A2 WO 0177151A2
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seq
fdrg
nucleic acid
protein
polypeptide
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PCT/US2001/011400
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WO2001077151A3 (fr
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Douglas A. Holtzman
Bruce M. Spiegelman
Clifford Hyunsuk Yoon
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Millennium Pharmaceuticals, Inc.
Dana-Farber Cancer Institute, Inc.
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Priority to AU2001249929A priority Critical patent/AU2001249929A1/en
Publication of WO2001077151A2 publication Critical patent/WO2001077151A2/fr
Publication of WO2001077151A3 publication Critical patent/WO2001077151A3/fr

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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K14/00Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/435Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/475Growth factors; Growth regulators
    • C07K14/515Angiogenesic factors; Angiogenin
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K48/00Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy

Definitions

  • Vasculogenesis involves establishment of a primitive vascular network during embryogenesis. Subsequently, angiogenesis remodels this network to form the mature cardiovascular system. In addition, angiogenesis takes place in adult tissues during tissue repair, the reshaping of female reproductive tissues and tumor growth and metastasis. (Maisonpierre et al. (1997) Science 277:55-60).
  • Endothelial cells have been found to be centrally involved in both vasculogenesis and angiogenesis. These cells migrate, proliferate and assemble to form tubes with tight cell to cell connections. Peri-endothelial support cells are then recruited to encase the endothelial tube to thereby provide maintenance and modulary functions to the blood vessels. (Hanahan (1997) Science 277:48-50). The process of establishing and remodeling of blood vessels is controlled by the interaction of several protein ligands and tyrosine kinase-like receptors expressed on endothelial cells. Such receptors include, for example, the recently discovered TIE receptor family consisting of TIE 1 and TIE2 which have been found to be critically involved in the formation of vascula ure.
  • ligands which bind to the TIE2 receptor and belong to the protein family which includes fibrinogen and ficolin have been discovered. These ligands include angiopoietin-1 which binds and induces phosphorylation of TIE2 (Davis et al. (1996) Cell 87:1161-1169) and angiopoietin-2 which acts as a natural antagonist for angiopoietin-1 and TIE2 (Maisonpierre (1997)
  • leptin a protein secreted by fat cells
  • the finding that a factor secreted by fat cells having a known role in metabolism and obesity also plays a role in angiogenesis demonstrates a novel link between adipocytes and the vasculature.
  • the complex functionality of leptin raises the possibility that there exist other molecules which may play a dual role in both angiogenesis and obesity.
  • the present invention is based, at least in part, on the discovery of novel secreted molecules having homology to angiopoietin which are believed to modulate angiogenesis and mediate the contribution of adipocytes to various metabolic processes.
  • novel molecules are referred to herein as Fibrinogen Domain Related (referred to herein as "FDRG” or TANGO 115) nucleic acid and protein molecules and are useful as modulating agents in regulating a variety of cellular processes (e.g., angiogenesis-related and metabolism-related processes).
  • this invention provides isolated nucleic acid molecules encoding FDRG proteins or biologically active portions , thereof, as well as nucleic acid fragments suitable as primers or hybridization probes for the detection of FDRG-encoding nucleic acids.
  • a FDRG nucleic acid molecule is 60% homologous to the nucleotide sequence shown in SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO: 13, SEQ ID NO: 14, the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or a complement thereof.
  • an isolated FDRG nucleic acid molecule encodes the amino acid sequence of human FDRG shown in SEQ ID NO:2.
  • an isolated FDRG nucleic acid molecule encodes the amino acid sequence of murine FDRG shown in SEQ ID NO: 12.
  • an isolated FDRG nucleic acid molecule has the nucleotide sequence of SEQ ID NO: 1 , or a complement thereof.
  • a FDRG nucleic acid molecule further comprises nucleotides 1-165 of SEQ ID NO:l.
  • a FDRG nucleic acid molecule further comprises nucleotides 1384- 1894 of SEQ ID NO : 1.
  • a FDRG nucleic acid molecule comprises the nucleotide sequence of SEQ ID NO:3.
  • an isolated FDRG nucleic acid molecule has the nucleotide sequence of SEQ ID NO: 11 , or a complement thereof.
  • a FDRG nucleic acid molecule further comprises nucleotides 1-148 of SEQ ID NO:l 1. In yet another embodiment, a FDRG nucleic acid molecule further comprises nucleotides 1379-1893 of SEQ ID NO:l 1. In yet another embodiment, a FDRG nucleic acid molecule comprises the nucleotide sequence of SEQ ID NO : 13.
  • an isolated FDRG nucleic acid molecule has the nucleotide sequence of SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:13, SEQ ID NO: 14 or a complement thereof.
  • a FDRG nucleic acid molecule comprises nucleotides 1-556 of SEQ ID NO:3 or SEQ ID NO:13 or nucleotides 1-481 of SEQ ID NO:4 or SEQ ID NO:14.
  • an isolated FDRG nucleic acid molecule has the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or a complement thereof.
  • a FDRG nucleic acid molecule includes a nucleotide sequence encoding a protein having an amino acid sequence sufficiently homologous to the amino acid sequence of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12, or SEQ ID NO: 15.
  • a FDRG nucleic acid molecule includes a nucleotide sequence encoding a protein having an amino acid sequence at least 60% homologous to the amino acid sequence of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO: 12, or SEQ ID NO: 15.
  • a FDRG nucleic acid molecule includes a nucleotide sequence encoding a protein having the amino acid sequence of SEQ ID NO: 2, SEQ ID NO:5, SEQ ID NO: 12, or SEQ ID NO: 15.
  • an isolated nucleic acid molecule of the present invention encodes a FDRG protein which includes a signal sequence, an N-terminal unique domain, a C-terminal fibrinogen-like domain, and is secreted.
  • the FDRG nucleic acid molecule encodes a FDRG protein and is a naturally occurring nucleotide sequence.
  • an isolated nucleic acid molecule of the present invention encodes a FDRG protein and comprises a nucleotide sequence which hybridizes under stringent hybridization conditions to a nucleic acid molecule having the nucleotide sequence of SEQ ID NO: 1 , SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO:14, or of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632.
  • FDRG nucleic acid molecules which specifically detect FDRG nucleic acid molecules relative to nucleic acid molecules encoding non-FDRG proteins.
  • a FDRG nucleic acid molecule hybridizes under stringent conditions to a nucleic acid molecule comprising nucleotides 1-721 of SEQ ID NO:l or SEQ ID NO:l 1.
  • a FDRG nucleic acid molecule hybridizes under stringent conditions to a nucleic acid molecule comprising nucleotides 1-556 of SEQ ID NO: 3 or SEQ ID NO : 13.
  • a FDRG nucleic acid molecule hybridizes under stringent conditions to a nucleic acid molecule comprising nucleotides 1-481 of SEQ ID NO:4 or SEQ ID NO: 14.
  • the FDRG nucleic acid molecule is at least 500 to 550 nucleotides in length, 600 to 650 nucleotides in length, 700 to 750 nucleotides in length, 800 to 850 nucleotides in length and hybridizes under stringent conditions to a nucleic acid molecule comprising the nucleotide sequence shown in SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l l, SEQ ID NO:13, SEQ ID NO: 14, the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or a complement thereof
  • the invention provides an isolated nucleic acid molecule which is antisense to the coding strand of a FDRG nucleic acid.
  • Another aspect of the invention provides a vector comprising a FDRG nucleic acid molecule.
  • the vector is a recombinant expression vector.
  • the invention provides a host cell containing a vector of the invention.
  • the invention also provides a method for producing FDRG protein by culturing in a suitable medium, a host cell of the invention containing a recombinant expression vector such that FDRG protein is produced.
  • an isolated FDRG protein has a signal sequence, an N-terminal unique domain, a C-terminal fibrinogen-like domain, and is secreted.
  • an isolated FDRG protein has an N-terminal unique domain and a C-terminal fibrinogen-like domain.
  • an isolated FDRG protein has an amino acid sequence sufficiently homologous to the amino acid sequence of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO: 12 or SEQ ID NO: 15.
  • a FDRG protein has an amino acid sequence at least about 60% homologous to the amino acid sequence of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO: 12 or SEQ ID NO: 15.
  • a FDRG protein has the amino acid sequence of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12 or SEQ ID NO:15.
  • Another embodiment of the invention features an isolated FDRG protein which is encoded by a nucleic acid molecule having a nucleotide sequence at least about 60% homologous to a nucleotide sequence of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO: 13, SEQ ID NO: 14, or the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or a complement thereof.
  • This invention also features an isolated FDRG protein which is encoded by a nucleic acid molecule having a nucleotide sequence which hybridizes under stringent hybridization conditions to a nucleic acid molecule comprising the nucleotide sequence of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO:14, the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or a complement thereof.
  • the polypeptide is fragment of a FDRG polypeptide comprising the amino acid sequence of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO: 12, SEQ ID NO: 15, or an amino acid sequence encoded by the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, where the fragment comprises at least 15 contiguous amino acids of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12, SEQ ID NO: 15, or the amino acid sequence encoded by the DNA insert of the plasmid deposited with ATCC as Accession Number 98632
  • the FDRG proteins of the present invention, or biologically active portions thereof can be operatively linked to a non-FDRG polypeptide to form FDRG fusion proteins.
  • the invention further features antibodies that specifically bind FDRG proteins, such as monoclonal or polyclonal antibodies.
  • the FDRG proteins or biologically active portions thereof can be incorporated into pharmaceutical compositions, which optionally include pharmaceutically acceptable carriers.
  • the present invention provides a method for detecting FDRG expression in a biological sample by contacting the biological sample with an agent capable of detecting a FDRG nucleic acid molecule, protein or polypeptide such that the presence of FDRG nucleic acid molecule, protein or polypeptide is detected in the biological sample.
  • the present invention provides a method for detecting the presence of FDRG activity in a biological sample by contacting the biological sample with an agent capable of detecting an indicator of FDRG activity such that the presence of FDRG activity is detected in the biological sample.
  • the invention provides a method for modulating FDRG activity comprising contacting the cell with an agent that modulates FDRG activity such that FDRG activity in the cell is modulated.
  • the agent inhibits FDRG activity.
  • the agent stimulates FDRG activity.
  • the agent is an antibody that specifically binds to FDRG protein.
  • the agent modulates expression of FDRG by modulating transcription of a FDRG gene or translation of a FDRG mRNA.
  • the agent is a nucleic acid molecule having a nucleotide sequence that is antisense to the coding strand of the FDRG mRNA or the FDRG gene.
  • the methods of the present invention are used to treat a subject having a disorder characterized by aberrant FDRG protein or nucleic acid expression or activity by administering an agent which is a FDRG modulator to the subject.
  • the FDRG modulator is a FDRG protein.
  • the FDRG modulator is a FDRG nucleic acid molecule.
  • the FDRG modulator is a peptide, peptidomimetic, or other small molecule.
  • the disorder characterized by aberrant FDRG protein or nucleic acid expression is a hematopoietic disorder, a differentiative or developmental disorder, a proliferative disorder or a cell recruitment disorder.
  • the present invention also provides a diagnostic assay for identifying the presence or absence of a genetic alteration characterized by at least one of (i) aberrant modification or mutation of a gene encoding a FDRG protein; (ii) mis-regulation of said gene; and (iii) aberrant post-translational modification of a FDRG protein, wherein a wild-type form of said gene encodes an protein with a FDRG activity.
  • the invention provides a method for identifying a compound that binds to or modulates the activity of a FDRG protein, by providing an indicator composition comprising a FDRG protein having FDRG activity, contacting the indicator composition with a test compound, and determining the effect of the test compound on FDRG activity in the indicator composition to identify a compound that modulates the activity of a FDRG protein.
  • the invention provides a method of treating obesity or diabetes in a subject which involves administering to the subject an agent (e.g., a small molecule modulator of FDRG, a FDRG nucleic acid molecule, or a FDRG antibody).
  • the invention provides a method for diagnosing obesity or diabetes in a subject utilizing FDRG nucleic acid molecles. In yet another aspect, the invention provides a method for identifying compounds which modulate metabolic disorders utilizing cells which expresses a FDRG receptor. In yet another aspect, the invention provides a method of regulating angiogenesis in a subject.
  • Figure I depicts the cDNA sequence and predicted amino acid sequences of human FDRG (also referred to as “hFDRG” or “hTl 15").
  • the nucleotide sequence corresponds to nucleic acids 1 to 1894 of SEQ ID NO:l.
  • the amino acid sequence corresponds to amino acids 1 to 406 of SEQ ID NO:2.
  • Figure 2 depicts the cDNA sequence and predicted amino acid sequence of mature human FDRG.
  • the nucleotide sequence corresponds to nucleic acids 1 to 1143 of SEQ ID NO:4.
  • the amino acid sequence corresponds to amino acids 1 to 381 of SEQ ID NO-.5.
  • Figure 3 depicts a multiple sequence alignment of the amino acid sequences of human FDRG (corresponding to amino acids 1 to 406 of SEQ ID NO:2), murine FDRG (corresponding to amino acids 1 to 410 of SEQ ID NO: 12), human angiopoietin 2 (GenbankTM Accession No. AF004327) (SEQ ID NO:8), murine angiopoietin 2 (GenbankTM Accession No. AF004326) (SEQ ID NO:9), and porcine ficolin (GenbankTM Accession No. L12345) (SEQ ID NO:10).
  • the alignment was generated using MegAlignTM sequence alignment software.
  • the initial pairwise alignment step was performed using a Lipman Pearson algorithm with a K-tuple of 1, a GAP penalty of 3, a window of 5, and diagonals saved set to 5.
  • the multiple alignment step was performed using the Clustal algorithm with a PAM 250 residue weight Table, a GAP penalty of 10, and a GAP length penalty of 10.
  • Figure 4 depicts the cDNA sequence and predicted amino acid sequences of murine FDRG (also referred to as "mFDRG", “mTl 15", or BK89).
  • the nucleotide sequence corresponds to nucleic acids 1 to 1893 of SEQ ID NO: 11.
  • the amino acid sequence corresponds to amino acids 1 to 410 of SEQ ID NO.T2.
  • Figure 5 depicts the cDNA sequence and predicted amino acid sequence of mature murine FDRG.
  • the nucleotide sequence corresponds to nucleic acids 1 to 1161 of SEQ ID NO: 14.
  • the amino acid sequence corresponds to amino acids 1 to 387 of SEQ ID NO:15.
  • Figure 7 depicts a pairwise alignment of human and murine FRDG amino acid sequences (corresponding to SEQ ID NO:2 and SEQ ID NO: 12, respectively). The alignment was generated as described in the legend of Fig. 6.
  • Panel A depicts the deduced amino acid sequences of mouse and human FDRG. Bold italics indicate the limits of the coiled-coil domain and bold indicates the limits of the fibrinogen-like domains.
  • Panel B is a schematic diagram of the predicted FDRG protein structure.
  • Panel C is a schematic depiction of the genomic structure of murine FDRG. Exons are denoted by black boxes and introns by a solid line.
  • Figure 8 depicts the genomic sequence of muring FDRG.
  • the present invention is based on the discovery of novel molecules having homology to the protein family that includes fibrinogen, angiopoietin(s), and ficolin, referred to herein as FDRG protein and nucleic acid molecules, which comprise a family of molecules having certain conserved structural and functional features.
  • FDRG protein and nucleic acid molecules which comprise a family of molecules having certain conserved structural and functional features.
  • the nucleotide sequence of a human FDRG nucleic acid molecule and the amino acid sequence of the predicted human FDRG protein molecule are depicted in Figure 1.
  • the nucleotide sequence of a murine FDRG nucleic acid molecule and the amino acid sequence of the predicted murine FDRG protein molecule are depicted in Figure 4.
  • family when referring to the protein and nucleic acid molecules of the invention is intended to mean two or more protein or nucleic acid molecules having a common structural domain and having sufficient amino acid or nucleotide sequence homology as defined herein.
  • family members can be naturally occurring and can be from either the same or different species.
  • a family can contain a first protein of human origin and a homologue of that protein of murine origin, as well as a second, distinct protein of human origin and a murine homologue of that protein.
  • An exemplary family of the present invention is the fibrinogen-like protein family whose members include, at least, human angiopoietin 1 , human angiopoietin 2, ficolin and fibrinogen.
  • Another exemplary family of the present invention is the FDRG protein family.
  • a FDRG family member is identified based on the presence of an "N-terminal coiled-coil domain" in the protein or corresponding nucleic acid molecule.
  • N-terminal coiled-coil domain includes a protein domain which is at about 100 amino acid residues in length and has a primary structure that is predicted to form a coiled-coil quaternary structure.
  • an "N-terminal coiled-coil domain” is at least about 90-110 amino acid residues in length, and preferably at least about 80-120 amino acid residues in length, and has a primary structure that is predicted to form a coiled-coil quaternary structure.
  • an "N-terminal coiled-coil domain” refers to a protein domain which is at about 100 amino acid residues in length, preferably at least about 90- 110 amino acid residues in length, and more preferably at least about 80-120 amino acid residues in length, and has at least about 70-75%, preferably at least about 80-85%, more preferably at least about 90-95% homology, and even more preferably greater than 95% homology with amino acid residues 99-170 of SEQ ID NO:2.
  • an "N-terminal coiled-coil domain” consists of about amino acid residues 99-170 of SEQ ID NO:2.
  • an "N-terminal coiled-coil domain” consists of about amino acid residues 103-174 of SEQ ID NO:12. In a preferred embodiment, an "N-terminal coiled-coil domain" is similar to that found in other members of the fibrinogen-like protein family.
  • the amino acid sequence of the protein family member can be searched against a database of HMMs (e.g. , the Pfam database, release 3.3) e.g. , using the default parameters.
  • HMMs e.g. , the Pfam database, release 3.3
  • the search can be performed using the hni sf program (family specific) and threshold score of 15 for determining a hit.
  • hnimsf is available as part of the HMMER package of search programs (HMMER 2.1.1, Dec. 1998) which is freely distributed by the Washington University school of medicine.
  • a hit to a fibrinogen_C (fibrinogen beta and gamma chains, C-terminal globular domain, Accession No. PF00147) HMM having a score of at least 150-200, preferably at least 200-250, more preferably at least 250-300, and more preferably at least 300-350 or more is determinative of the presence of a C-terminal fibrinogen-like domain within a query protein.
  • a search using the amino acid sequence of SEQ ID NO:2 was performed against the HMM database resulting in two hits to the fibrinogen_C HMM having scores of 162.3 and 69.8, respectively, resulting in the identification of a C-terminal fibrinogen-like domain in the amino acid sequence of SEQ ID NO:2.
  • a FDRG protein has a C- terminal fibrinogen-like domain at about amino acids 184-400 of SEQ ID NO:2.
  • a search using the amino acid sequence of SEQ ID NO: 12 was performed against the HMM database resulting in two hits to the fibrinogen_C HMM having scores of 160.9 and 66.3, respectively, resulting in the identification of a C-terminal fibrinogen-like domain in the amino acid sequence of SEQ ID NO:12.
  • a FDRG protein has a C-terminal fibrinogen-like domain domain at about amino acids 188-404 of SEQ ID NO:12.
  • the C-terminal fibrinogen-like domains of human and mouse FDRG, as well as those of human angiopoietin, mouse angoipoietin- 2, and ficolin are indicated by bold italics in Figure 3.
  • a FDRG family member is identified based on the presence of a "C-terminal fibrinogen-like domain" in the protein or corresponding nucleic acid molecule.
  • C-terminal fibrinogen-like domain includes a protein domain which is at least about 200-225 amino acid residues in length and has at least about 38-41% homology with human fibrinogen beta or gamma chain.
  • a "C-terminal fibrinogen-like domain” is at least about 100-300 amino acid residues in length, and preferably at least about 150-250 amino acid residues in length, and has at least about 25-60%, preferably at least about 30-50%, and more preferably at least about 35-45% homology with human fibrinogen beta or gamma chain.
  • a "C-terminal fibrinogen-like domain” refers to a protein domain which is at least about 100-300 amino acid residues in length, preferably at least about 150-250 amino acid residues in length, and more preferably at least about 200 amino acid residues in length, and has at least about 25-60%, preferably at least about 30-50%), more preferably at least about 35-45% homology, and even more preferably at least about 38-41% homology with amino acid residues 184-400 of SEQ ID NO:2.
  • a C-terminal fibrinogen domain is involved in protein-protein interactions.
  • the amino acid sequence of the protein family member can be searched against a database of HMMs (e.g., the Pfam database, release 3.3) e.g., using the default parameters.
  • the search can be performed using the hmmsf program (family specific) and threshold score of 15 for determining a hit.
  • hmmsf is available as part of the HMMER package of search programs (HMMER 2.1.1, Dec. 1998) which is freely distributed by the Washington University school of medicine.
  • a hit to a f ⁇ brinogen_C (fibrinogen beta and gamma chains, C-terminal globular domain, Accession No.
  • PF00147 HMM having a score of at least 150-200, preferably at least 200-250, more preferably at least 250-300, and more preferably at least 300-350 or more is determinative of the presence of a C-terminal fibrinogen-like domain within a query protein.
  • a search using the amino acid sequence of SEQ ID NO:2 was performed against the HMM database resulting in two hits to the fibrinogen_C HMM having scores of 162.3 and 69.8, respectively, resulting in the identification of a C-terminal fibrinogen-like domain in the amino acid sequence of SEQ ID NO:2.
  • a FDRG protein has a C- terminal fibrinogen-like domain at about amino acids 184-400 of SEQ ID NO:2.
  • a FDRG protein has a C-terminal fibrinogen-like domain domain at about amino acids 188-404 of SEQ ID NO.T2.
  • the C-terminal fibrinogen-like domains of human and mouse FDRG, as well as those of human angiopoietin, mouse angoipoietin- 2, and ficolin are indicated by bold italics in Figure 3.
  • a C-terminal fibrinogen-like domain can further contain at least about two, more preferably at least three, and even more preferably at least four cysteine residues which are conserved between FDRG molecules and members of the fibrinogen-like protein family (e.g., human angiopoietin 2, murine angiopoietin 2, human angiopoietin 1, and ficolin.)
  • the C-terminal fibrinogen-like domain of FDRG has cysteine residues which are located in the same or similar positions as cysteine residues in a fibrinogen-like protein family member.
  • cysteine residues of the invention are those in which cysteine residues in the amino acid sequence of FDRG are located in the same or similar position as the cysteine residues in other FDRG family or fibrinogen-like family members.
  • Fig. 3 shows cysteine residues located in the same or similar positions of the human FDRG protein
  • amino acid number 188 of human FDRG and amino acid number 284 of the human angiopoietin 2 protein amino acid number 216 of human FDRG and amino acid number 313 of the human angiopoietin 2 protein; amino acid number 341 of human FDRG and amino acid number 437 of the human angiopoietin 2 protein; and amino acid number 354 of human FDRG and amino acid number 450 of the human angiopoietin 2 protein.
  • conserveed cysteines are indicated by asterices in Fig. 3.
  • N-terminal unique domain includes a protein domain of a FDRG protein family member which includes amino acid residues N-terminal to the N-terminus of a C-terminal fibrinogen-like domain in the amino acid sequence of the FDRG protein, e.g., a protein domain which includes amino acid residues from the N-terminal amino acid residue of the amino acid sequence of the protein to the N-terminus of the C-terminal fibrinogen-like domain.
  • an "N-terminal unique domain” includes a protein domain which is at least about 170-190 amino acid residues in length and has at least about 75-85% homology with the amino acid sequence of a second FDRG family member.
  • an N- terminal unique domain is at least about 150-210 amino acid residues in length, preferably at least about 160-200 amino acid residues in length, and has at least about 65-95%, preferably at least about 70-90% homology with the amino acid sequence of a second FDRG family member.
  • an N-terminal unique domain of a FDRG protein family member is not sufficiently homologous to the amino acid sequence of a member of another protein family, such as an angiopoietin protein family.
  • an N-terminal unique domain of human FDRG (containing about amino acids 1-183 of SEQ ID NO:2 has at least about 80% homology to the N- terminal unique domain of murine FDRG (amino acid residues 1 - 187 of SEQ ID NO : 12) but has no significant homology to the amino acid sequence of human angiopoietin 2.
  • an N-terminal unique domain may further contain an "N-terminal signal sequence".
  • a signal sequence refers to a peptide containing about 25 amino acids which occurs at the extreme N-terminal end of secretory and integral membrane proteins and which contains large numbers of hydrophobic amino acid residues.
  • a signal sequence contains at least about 15-35 amino acid residues, preferably about 18-32 amino acid residues, more preferably about 20-30 amino acid residues, and more preferably about 22-28 amino acid residues, and has at least about 40-70%, preferably about 50-65%, and more preferably about 55- 60% hydrophobic amino acid residues (e.g. , Alanine, Valine, Leucine, Isoleucine, Phenylalanine, or Proline).
  • Such a "signal sequence” also referred to in the art as a “signal peptide” serves to direct a protein containing such a sequence to a lipid bilayer.
  • a FDRG protein contains both an N-terminal unique domain and a C-terminal fibrinogen-like domain.
  • a FDRG N-terminal unique domain further contains a signal sequence.
  • a FDRG protein contains an N-terminal unique domain comprising amino acids 1-183 of SEQ ID NO:2 which further contains a signal sequence at amino acids 1- 25 of SEQ ID NO:2.
  • a FDRG protein contains an N-terminal unique domain comprising amino acids 1-158 of SEQ ID NO:5.
  • a FDRG protein contains an N-terminal unique domain comprising amino acids 1 - 187 of SEQ ID NO : 12 which further contains a signal sequence at amino acids 1-23 of SEQ ID NO.T2.
  • a FDRG protein contains an N-terminal unique domain comprising amino acids 1-162 of SEQ ID NO:15.
  • a FDRG protein encodes a mature FDRG protein.
  • the term "mature FDRG protein” refers to a FDRG protein from which the signal peptide has been cleaved.
  • a mature FDRG protein contains amino acid residues 1-381 of SEQ ID NO: 5.
  • a mature FDRG protein contains amino acid residues 1-387 of SEQ ID NO : 15.
  • a FDRG protein is a mature FDRG protein which comprises a C-terminal fibrinogen-like domain.
  • Preferred FDRG molecules of the present invention have an amino acid sequence sufficiently homologous to the amino acid sequence of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12 or SEQ ID NO:15.
  • the term "sufficiently homologous” refers to a first amino acid or nucleotide sequence which contains a sufficient or minimum number of identical or equivalent (e.g. , an amino acid residue which has a similar side chain) amino acid residues or nucleotides to a second amino acid or nucleotide sequence such that the first and second amino acid or nucleotide sequences share common structural domains and/or a common functional activity.
  • amino acid or nucleotide sequences which share common structural domains have at least about 60-65% homology, preferably 70-75% homology, more preferably 80-85%, and more preferably 90-95% homology across the amino acid sequences of the domains and contain at least one, preferably two, and more preferably three or four structural domains, are defined herein as sufficiently homologous.
  • amino acid or nucleotide sequences that share at least 60-65%, preferably 70-75%>, more preferably 80- 85%, and even more preferably 90-95% homology and share a common functional activity are defined herein as sufficiently homologous.
  • an "FDRG activity”, “biological activity of FDRG” or “functional activity of FDRG”, refers to an activity exerted by a FDRG protein, polypeptide or nucleic acid molecule on a FDRG responsive cell as determined in vivo, or in vitro, according to standard techniques.
  • a FDRG activity is a direct activity, such as an association with a cell-surface protein (e.g. , a FDRG receptor or FDRG binding protein).
  • a FDRG activity is an indirect activity, such as the modulation of the activity of a second protein (e.g. a cellular signaling molecule) mediated by interaction of the FDRG protein with a cell surface protein.
  • a FDRG activity is at least one or more of the following activities: (i) interaction of a FDRG protein in the extracellular milieu with a non-FDRG protein molecule (e.g., a FDRG receptor) on the surface of the same cell which secreted the FDRG protein molecule; (ii) interaction of a FDRG protein in the extracellular milieu with a non-FDRG protein molecule (e.g., a FDRG receptor) on the surface of a different cell from that which secreted the FDRG protein molecule; (iii) complex formation between a FDRG protein and a FDRG receptor; (iv) complex formation between a FDRG protein and non-FDRG receptor; (v) modulation of signal transduction via a cell surface protein (e.g., a FDRG receptor); (vi) modulation of the expression of adipogenic genes; (vii) modulation of a PPAR ⁇ function or modulation by a PPAR ⁇ function; (vii
  • a FDRG activity is at least one or more of the following activities: (i) activation of a FDRG-dependent signal transduction pathway; (ii) modulation of angiogenesis; (iii) modulation of a hematopoiesis; (iv) modulation of the proliferation, development or differentiation of a FDRG-expressing cell or FDRG-receptor expressing cell (e.g., mediation of growth and/or differentiation of adipocytes, for example, white adipocytes or brown adipocytes); (v) modulation of the proliferation, development or differentiation of a non- FDRG-expressing cell or FDRG-expressing cell; (vi) modulation of the ho eostasis of a FDRG-expressing cell; (vii) modulation of insulin sensitivity and/or insulin responsiveness; (viii) modulation of insulin secretion; (ix) modulation of cell recruitment; (x) modulation of the homeostasis of a non-FDRG-expressing cell;
  • the present invention is based, at least in part, on the discovery of a novel secreted protein (the human FDRG protein having the amino acid sequence of SEQ ID NO:2) which was isolated from an aortic endothelial cDNA library, is. highly expressed in placenta and fat, and has homology to angiopoietin.
  • the present invention is based further in part on the discovery of a murine FDRG protein having the amino acid sequence of SEQ ID NO: 12 which was isolated in a screen for transcriptional targets of PPAR ⁇ , a nuclear hormone receptor that can act as an adipogenic transcription factor and a potent regulator of systemic insulin action.
  • PPAR ⁇ is a nuclear hormone receptor which exists in two isoforms ( ⁇ l and ⁇ 2) ' formed by alternative splicing (Zhu et al. (1995) PNAS 92:7921-7925) and which appears to function as both a direct regulator of many fat-specific genes and also as a "master" regulator that can trigger the entire program of adipogenesis (Spiegelman and Flier (1996) Cell 87:377-389).
  • PPAR ⁇ forms a heterodimer with RXR ⁇ and has been shown to bind directly to well characterized fat-specific enhancers from the adipocyte P2 (aP2: Tontonoz (1994) Genes Dev.
  • FDRG phosphoenolpyruvate carboxykinase
  • Murine FDRG is higly expressed in brown and white fat and placenta and expression is acutely induced in cultured cells by PPAR ⁇ ligands such as thiazolidinediones (TZDs).
  • PPAR ⁇ ligands such as thiazolidinediones (TZDs).
  • Murine FDRG expression is also upregulated in tissues of rodents chronically treated with TZDs.
  • FDRG mRNA levels are elevated in murine models of obesity including the ob/ob and db/db mice, and are regulated on an acute basis by nutrition.
  • a FDRG activity is at least one or more of the following activities: (1) maintenance of energy homeostasis (e.g., regulating the balance and/or imbalance between energy storage and energy expenditure, for example, increasing/decreasing energy expenditure); (2) regulation of adaptive thermogenesis (e.g., regulation of the biogenesis of mitochondria, regulation of the expression of mitocrondrial enzymes, regulation of expression of uncoupling proteins; (3) regulation of adiposity; (4) regulation of lipolysis and/or lipogenesis; (6) modulation of the efficiency of energy storage; (6) regulation of appetite; (7) regulation of vasculogenesis (i.e., blood vessel formation or vascular remodeling); (8) regulation of tumor angiogenesis; (9) regulation of wound healing; (10) expansion/reduction of tumor mass; and (11) expansion/reduction of fat mass.
  • energy homeostasis e.g., regulating the balance and/or imbalance between energy storage and energy expenditure, for example, increasing/decreasing energy expenditure
  • adaptive thermogenesis e.g.
  • a FDRG protein or polypeptide is a secreted intercellular signalling molecule or factor (e.g. , a secreted homeostatic factor) which is capable of modulating or regulating or modulates or regulates glucose metabolism and/or insulin sensitivity, for example, in tissues such as muscle and/or liver.
  • a FDRG protein or polypeptide is a secreted intercellular signalling molecule or factor which is capable of modulating or regulating or modulates or regulates (e.g., induces) angiogenesis and/or adipogenesis (e.g., fat development and/or differentiation.)
  • a FDRG molecule or preferably, a FDRG or FDRG receptor modulator is useful for regulating, preventing and/or treating at least one or more of the following diseases or disorders: (1) obesity (e.g.
  • obesity e.g., cardiovasculalar disorders
  • diabetes e.g., Type I or insulin dependent diabetes mellitus, Type II or non-insulin dependent diabetes mellitus, and/or insulin-resistent diabetes, both Type I and Type II
  • disorders of energy homeostasis e.g., metabolic abnormalities typical of obesity (e.g., hyperinsulinemia); (6) insulin resistance; (7) disorders associated with lipid metabolism (e.g., cachexia); (8) atherosclerosis; and (9) disorders associated with abnormal vasculogenesis (e.g., cancers including, but not limited to, cancers of the epithelia (e.g., carcinomas of the pancreas, stomach, liver, secretory glands (e.g., adenocarcinoma), bladder, lung, breast, skin (e.g., f ⁇ bromatosis or malignant melanoma), reproductive tract including
  • a FDRG molecule, FDRG modulator or FDRG receptor modulator is useful for regulating, preventing and/or treating Type II diabetes mellitus and or obesity, insulin resistance, hyperinsulinemia and/or hypergyycemia associated with Type II diabetes mellitus.
  • a FDRG molecule or preferably, a FDRG or FDRG receptor modulator is an antidiabetic agent or an insulin sensitizing agent.
  • a FDRG molecule or preferably, a FDRG or FDRG receptor modulator is an angiogenic factor.
  • FDRG proteins and polypeptides having a FDRG activity.
  • Preferred FDRG proteins have a C- terminal fibrinogen-like domain and a FDRG activity.
  • the FDRG protein has an N-terminal unique domain, a C-terminal fibrinogen-like domain, and a FDRG activity.
  • the FDRG protein has at least at least a C-terminal fibrinogen-like domain, an N-terminal unique domain, a FDRG activity, and an amino acid sequence sufficiently homologous to an amino acid sequence of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO: 12 or SEQ ID NO: 15.
  • the FDRG protein and nucleic acid molecules of the present invention are human FDRG molecules.
  • a human FDRG cDNA molecule was obtained from a human aortic endothelial cDNA library as described in Example 1.
  • the nucleotide sequences of the isolated human FDRG cDNA and the predicted amino acid sequence of the human FDRG protein are shown in Figure 1 and in SEQ ID NOs: 1 and 2, respectively.
  • the nucleotide sequence corresponding to the coding region of the human FDRG cDNA is represented as SEQ ID NO:3.
  • the human FDRG I cDNA set forth in SEQ ID NO:l is approximately 1894 nucleotides in length and encodes a protein which is approximately 406 amino acid residues in length (SEQ ID NO:2).
  • the human FDRG protein contains a signal sequence, an N-terminal unique domain, and a C-terminal fibrinogen-like domain, as defined herein.
  • a FDRG N-terminal unique domain can be found at least, for example, from about amino acids 1-183 of SEQ ID NO:2 and, for example, from about amino acids 1-158 of SEQ ID NO: 5.
  • a FDRG C-terminal fibrinogen-like domain can be found at least, for example, from about amino acids 184-400 of SEQ ID NO:2 and, for example, from about amino acids 159-374 of SEQ ID NO:5.
  • a signal sequence can be found at least, for example, from about amino acids 1-23 of SEQ ID NO:2. The prediction of such a signal peptide can be made, for example, utilizing the computer ⁇ algorithm SIGNALP (Henrik, et al (1997) Protein Engineering 10:1-6).
  • the FDRG protein and nucleic acid molecules of the present invention are murine FDRG molecules.
  • a murine FDRG cDNA molecule was obtained from a screen designed to delect nucleic acids regulated by PPAR ⁇ , a fat-specific transcription factor, as described in Example 4.
  • the nucleotide sequences of the isolated murine FDRG cDNA and the predicted amino acid sequence of the murine FDRG protein are shown in Figure 4 and in SEQ ID NOs:l 1 and 12, respectively.
  • the nucleotide sequence corresponding to the coding region of the murine FDRG cDN A is represented as SEQ ID NO : 13.
  • the murine FDRG I cDNA set forth in SEQ ID NO:l 1 is approximately 1893 nucleotides in length and encodes a protein which is approximately 410 amino acid residues in length (SEQ ID NO: 12).
  • the murine FDRG protein contains a signal sequence, an N-terminal unique domain, and a C-terminal fibrinogen-like domain, as defined herein.
  • a FDRG N-terminal unique domain can be found at least, for example, from about amino acids 1-187 of SEQ ID NO: 12 and, for example, from about amino acids 1-162 of SEQ ID NO: 15.
  • a FDRG C-terminal fibrinogen-like domain can be found at least, for example, from about amino acids 188-404 of SEQ ID NO:12 and, for example, from about amino acids 163-379 of SEQ ID NO: 15.
  • a signal sequence can be found at least, for example, from about amino acids 1-23 of SEQ ID NO.T2. The prediction of such a signal peptide can be made, for example, utilizing the computer algorithm SIGNALP (Henrik, et al. (1997) Protein Engineering 10:1-6).
  • FDRG mRNA expression was particularly high in placenta and fat as determined by norther blot analysis of various human and mouse tissues (See Examples 2 and 8).
  • nucleic acid molecules that encode FDRG proteins or biologically active portions thereof, as well as nucleic acid fragments sufficient for use as hybridization probes to identify FDRG-encoding nucleic acids (e.g. , FDRG mRNA) and fragments for use as PCR primers for the amplification or mutation of FDRG nucleic acid molecules.
  • nucleic acid molecule is intended to include DNA molecules (e.g., cDNA or genomic DNA) and RNA molecules (e.g., mRNA) and analogs of the DNA or RNA generated using nucleotide analogs.
  • the nucleic acid molecule can be single-stranded or double- stranded, but preferably is double-stranded DNA.
  • An "isolated" nucleic acid molecule is one which is separated from other nucleic acid molecules which are present in the natural source of the nucleic acid.
  • an "isolated" nucleic acid is free of sequences which naturally flank the nucleic acid (i.e., sequences located at the 5' and 3' ends of the nucleic acid) in the genomic DNA of the organism from which the nucleic acid is derived.
  • the isolated FDRG nucleic acid molecule can contain less than about 5 kb, 4 kb, 3 kb, 2 kb, 1 kb, 0.5 kb or 0.1 kb of nucleotide sequences which naturally flank the nucleic acid molecule in genomic DNA of the cell from which the nucleic acid is derived.
  • an "isolated" nucleic acid molecule such as a cDNA molecule, can be substantially free of other cellular material, or culture medium when produced by recombinant techniques, or substantially free of chemical precursors or other chemicals when chemically synthesized.
  • a nucleic acid molecule of the present invention e.g., a nucleic acid molecule having the nucleotide sequence of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO: 13, SEQ ID NO: 14, the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or a portion thereof, can be isolated using standard molecular biology techniques and the sequence information provided herein.
  • FDRG nucleic acid molecules can be isolated using standard hybridization and cloning techniques (e.g., as described in Sambrook, J., Fritsh, E. F., and Maniatis, T. Molecular Cloning: A Laboratory Manual. 2nd, ed., Cold Spring Harbor Laboratory, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, 1989). Moreover, a nucleic acid molecule encompassing all or a portion of SEQ ID NO:
  • nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632 can be isolated by the polymerase chain reaction (PCR) using synthetic oligonucleotide primers designed based upon the sequence of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, or the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632.
  • a nucleic acid of the invention can be amplified using cDNA, mRNA or alternatively, genomic DNA, as a template and appropriate oligonucleotide primers according to standard PCR amplification techniques.
  • the nucleic acid so amplified can be cloned into an appropriate vector and characterized by DNA sequence analysis.
  • oligonucleotides corresponding to FDRG nucleotide sequences can be prepared by standard synthetic techniques, e.g., using an automated DNA synthesizer.
  • an isolated nucleic acid molecule of the invention comprises the nucleotide sequence shown in SEQ ID NO:l.
  • the sequence of SEQ ID NO: 1 corresponds to a human FDRG cDNA.
  • This cDNA comprises sequences encoding a human FDRG protein (i.e., "the coding region", from nucleotides 166-1386), as well as 5' untranslated sequences (nucleotides 1 to 165) and 3' untranslated sequences (nucleotides 1387 to 1894).
  • the nucleic acid molecule can comprise only the coding region of SEQ ID NO.T (e.g., nucleotides 166 to 1386).
  • an isolated nucleic acid molecule of the invention comprises the nucleotide sequence shown in SEQ ID NO:3. The sequence of SEQ ID NO: 3 corresponds to the human FDRG cDNA.
  • This cDNA comprises sequences encoding the human FDRG protein (i.e., "the coding region", from nucleotides 1 to 1218 of SEQ ID NO:3).
  • an isolated nucleic acid molecule of the invention comprises the nucleotide sequence shown in SEQ ID NO:4.
  • the sequence of SEQ ID NO:4 corresponds to human FDRG cDNA.
  • This cDNA comprises sequences encoding the mature FDRG protein (i.e., from nucleotides 241-1386 of SEQ ID NO:l after the signal sequence has been cleaved).
  • an isolated nucleic acid molecule of the invention comprises the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632.
  • a plasmid containing the full length nucleotide sequence encoding FDRG was deposited with the American Type Culture Collection (ATCC), Rockville, Maryland, on January 14, 1997 and assigned Accession Number 98632.
  • an isolated nucleic acid molecule of the invention comprises the nucleotide sequence shown in SEQ ID NO: 13.
  • the sequence of SEQ ID NO: 13 corresponds to a murine FDRG cDNA.
  • This cDNA comprises sequences encoding a murine FDRG protein (i.e., "the coding region", from nucleotides 149-1378), as well as 5' untranslated sequences (nucleotides 1 to 148) and 3' untranslated sequences (nucleotides 1379 to 1893).
  • the nucleic acid molecule can comprise only the coding region of SEQ ID NO: 13 (e.g., nucleotides 149 to 1378).
  • an isolated nucleic acid molecule of the invention comprises the nucleotide sequence shown in SEQ ID NO: 13.
  • the sequence of SEQ ID NO: 13 corresponds to the murine FDRG cDNA.
  • This cDNA comprises sequences encoding the murine FDRG protein (i.e., "the coding region", from nucleotides 1 to 1230 of SEQ ID NO: 13).
  • an isolated nucleic acid molecule of the invention comprises the nucleotide sequence shown in SEQ ID NO: 14.
  • the sequence of SEQ ID NO: 14 corresponds to murine FDRG cDNA.
  • This cDNA comprises sequences encoding the mature FDRG protein (i.e., from nucleotides 710-1380 of SEQ ID NO:l 1 after the signal sequence has been cleaved).
  • an isolated nucleic acid molecule of the invention comprises a nucleic acid molecule which is a complement of the nucleotide sequence shown in SEQ ID NO: 1 , SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO: 11 , SEQ ID NO: 13, SEQ ID NO: 14, the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or a portion of any of these nucleotide sequences.
  • a nucleic acid molecule which is complementary to the nucleotide sequence shown in SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO.T3, SEQ ID NO.T4, or the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632 is one which is sufficiently complementary to the nucleotide sequence shown in SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO:14, or the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632 such that it can hybridize to the nucleotide sequence shown in SEQ ID NO: 1, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO:14, or the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC
  • an isolated nucleic acid molecule of the present invention comprises a nucleotide sequence which is at least about 60-65%, preferably at least about 70-75%, more preferable at least about 80-85%, and even more preferably at least about 90-95% or more homologous to the nucleotide sequence shown in SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO: 13, SEQ ID NO: 14, the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or a portion of any of these nucleotide sequences.
  • an isolated nucleic acid molecule of the present invention comprises a nucleotide sequence which is at least about 61%, 62%>, 63%, 64%, 65%, 66%, 67%, 68%, or 69% homologous, preferably at least about 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, or 79% homologous, more preferably at least about 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, or 89% homologous, and even more preferably at least about 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% or more homologous to the nucleotide sequence shown in SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO:14, the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number
  • nucleic acid molecule of the invention can comprise only a portion of the nucleic acid sequence of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:ll, SEQ ID NO:13, SEQ ID NO:14, or the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, for example a fragment which can be used as a probe or primer or a fragment encoding a biologically active portion of FDRG.
  • the nucleotide sequence determined from the cloning of the human and murine FDRG genes allows for the generation of probes and primers designed for use in identifying and/or cloning FDRG homologues in other cell types, e.g., from other tissues, as well as FDRG homologues from other mammals.
  • the probe/primer typically comprises substantially purified oligonucleotide.
  • the oligonucleotide typically comprises a region of nucleotide sequence that hybridizes under stringent conditions to at least about 12, preferably about 25, more preferably about 40, 50 or 75 consecutive nucleotides of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO:14, or the DNA insert of the plasmid deposited with ATCC as Accession Number 98632 sense, or an anti-sense sequence of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:ll, SEQ ID NO:13, SEQ ID NO:14, or the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or of a naturally occurring mutant of SEQ ID NO.T, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:ll, SEQ ID NO:13, SEQ ID NO:14, or the DNA insert of the plasmid deposited with ATCC as Acces
  • Probes based on the human FDRG nucleotide sequence can be used to detect transcripts or genomic sequences encoding the same or homologous proteins.
  • the probe further comprises a label group attached thereto, e.g., the label group can be a radioisotope, a fluorescent compound, an enzyme, or an enzyme co-factor.
  • Such probes can be used as a part of a diagnostic test kit for identifying cells or tissue which misexpress a FDRG protein, such as by measuring a level of a FDRG- encoding nucleic acid in a sample of cells from a subject e.g. , detecting FDRG mRNA levels or determining whether a genomic FDRG gene has been mutated or deleted.
  • a nucleic acid fragment encoding a "biologically active portion of FDRG” can be prepared by isolating a portion of SEQ ID NO: 1 , SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO:14, or the DNA insert of the plasmid deposited with ATCC as Accession Number 98632 which encodes a polypeptide having a FDRG biological activity (the biological activities of the FDRG proteins have previously been described), expressing the encoded portion of FDRG protein (e.g., by recombinant expression in vitro) and assessing the activity of the encoded portion of FDRG.
  • the invention further encompasses nucleic acid molecules that differ from the nucleotide sequence shown in SEQ ID NO: 1 , SEQ ID NO:3, SEQ ID NO:4 and from the nucleotide sequences of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or portions thereof, due to degeneracy of the genetic code and thus encode the same FDRG protein as that encoded by the nucleotide sequence shown in SEQ ID NO:l, SEQ ID NO:3 or SEQ ID NO:4 or by the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632.
  • an isolated nucleic acid molecule of the invention has a nucleotide sequence encoding a protein having an amino acid sequence shown in SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12 or SEQ ID NO:15.
  • DNA sequence polymorphisms that lead to changes in the amino acid sequences of FDRG may exist within a population (e.g. , the human population). Such genetic polymorphism in the FDRG gene may exist among individuals within a population due to natural allelic variation.
  • the terms "gene” and “recombinant gene” refer to nucleic acid molecules comprising an open reading frame encoding a FDRG protein, preferably a mammalian FDRG protein.
  • Such natural allelic variations can typically result in 1-5% variance in the nucleotide sequence of the FDRG gene. Any and all such nucleotide variations and resulting amino acid polymorphisms in FDRG that are the result of natural allelic variation and that do not alter the functional activity of FDRG are intended to be within the scope of the invention.
  • nucleic acid molecules encoding FDRG proteins from other species and thus which have a nucleotide sequence which differs from the human sequences of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO: 14, or the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as Accession Number 98632 are intended to be within the scope of the invention.
  • Nucleic acid molecules corresponding to natural allelic variants and homologues of the FDRG cDNA of the invention can be isolated based on their homology to the human FDRG nucleic acids disclosed herein using the human cDNA, or portions thereof, as a hybridization probe according to standard hybridization techniques under stringent hybridization conditions.
  • a viral FDRG cDNA can be isolated based on its homology to human FDRG.
  • an isolated nucleic acid molecule of the invention is at least 15 nucleotides in length and hybridizes under stringent conditions to the nucleic acid molecule comprising the nucleotide sequence of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO:14, or the DNA insert of the plasmid deposited with ATCC as Accession Number 98613.
  • the nucleic acid is at least 30, 50, 100, 250 or 500 nucleotides in length.
  • hybridizes under stringent conditions is intended to describe conditions for hybridization and washing under which nucleotide sequences at least 60% homologous to each other typically remain hybridized to each other.
  • the conditions are such that sequences at least about 65%, more preferably at least about 70%, and even more preferably at least about 75% homologous to each other typically remain hybridized to each other.
  • stringent conditions are known to those skilled in the art and can be found in Current Protocols in Molecular Biology, John Wiley & Sons, N.Y. (1989), 6.3.1-6.3.6.
  • a preferred, non-limiting example of stringent hybridization conditions are hybridization in 6X sodium chloride/sodium citrate (SSC) at about 45°C, followed by one or more washes in 0.2 X SSC, 0.1% SDS at 50-65°C.
  • SSC 6X sodium chloride/sodium citrate
  • an isolated nucleic acid molecule of the invention that hybridizes under stringent conditions to the sequence of SEQ ID NO:l, SEQ ID NO:3 or SEQ ID NO:4 corresponds to a naturally-occurring nucleic acid molecule.
  • a "naturally-occurring" nucleic acid molecule refers to an RNA or DNA molecule having a nucleotide sequence that occurs in nature (e.g. , encodes a natural protein).
  • allelic variants of the FDRG sequence that may exist in the population, the skilled artisan will further appreciate that changes can be introduced by mutation into the nucleotide sequence of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, or the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, thereby leading to changes in the amino acid sequence of the encoded FDRG protein, without altering the functional ability of the FDRG protein.
  • nucleotide substitutions leading to amino acid substitutions at "non-essential" amino acid residues can be made in the sequence of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:ll, SEQ ID NO:13, SEQ ID NO:14, or the DNA insert of the plasmid deposited with ATCC as Accession Number 98632.
  • a "non-essential" amino acid residue is a residue that can be altered from the wild-type sequence of FDRG (e.g., the sequence of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO.T2 or SEQ ID NO: 15) without altering the biological activity, whereas an "essential" amino acid residue is required for biological activity.
  • amino acid residues that are conserved among the FDRG proteins of the present invention are predicted to be particularly unamenable to alteration.
  • amino acid residues that are conserved between FDRG protein and other proteins having fibrinogen-like domains are not likely to be amenable to alteration.
  • another aspect of the invention pertains to nucleic acid molecules encoding FDRG proteins that contain changes in amino acid residues that are not essential for activity.
  • Such FDRG proteins differ in amino acid sequence from SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO: 12 or SEQ ID NO: 15 yet retain biological activity.
  • the isolated nucleic acid molecule comprises a nucleotide sequence encoding a protein, wherein the protein comprises an amino acid sequence at least about 60-65% homologous to the amino acid sequence of SEQ ID NO:2.
  • the protein encoded by the nucleic acid molecule is at least about 70-75% homologous to SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12, or SEQ ID NO:15, more preferably at least about 80-85% homologous to SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO: 12, or SEQ ID NO: 15, and even more preferably at least about 90-95% homologous to SEQ ID NO:2, SEQ ID O:5, SEQ ID NO:12, or SEQ ID NO:15.
  • the isolated nucleic acid molecule comprises a nucleotide sequence encoding a protein, wherein the protein comprises an amino acid sequence at least about 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, or 69% homologous, preferably at least about 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, or 79% homologous, more preferably at least about 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%o, or 89% homologous, and even more preferably at least about 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% or more homologous to SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO.T2, or SEQ ID NO:15.
  • An isolated nucleic acid molecule encoding a FDRG protein homologous to the protein of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12 or SEQ ID NO:15 can be created by introducing one or more nucleotide substitutions, additions or deletions into the nucleotide sequence of SEQ ID NO:l, SEQ ID NO:3 or SEQ ID NO:4, or into the nucleotide sequence of the DNA insert of the plasmid deposited with ATCC as
  • Families of amino acid residues having similar side chains have been defined in the art. These families include amino acids with basic side chains (e.g., lysine, arginine, histidine), acidic side chains (e.g., aspartic acid, glutamic acid), uncharged polar side chains (e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine), nonpolar side chains (e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan), beta-branched side chains (e.g., threonine, valine, isoleucine) and aromatic side chains (e.g., tyrosine, phenylalanine, tryptophan, histidine).
  • basic side chains e.g., lysine, arginine, histidine
  • acidic side chains e.g.
  • a predicted nonessential amino acid residue in FDRG is preferably replaced with another amino acid residue from the same side chain family.
  • mutations can be introduced randomly along all or part of a FDRG coding sequence, such as by saturation mutagenesis, and the resultant mutants can be screened for FDRG biological activity to identify mutants that retain activity.
  • SEQ ID NO: 1 SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO:14, or the DNA insert of the plasmid deposited with ATCC as Accession Number 98632
  • the encoded protein can be expressed recombinantly and the activity of the protein can be determined.
  • a mutant FDRG protein can be assayed for (1) activation of a FDRG-dependent signal transduction pathway; (2) modulation of secretion of a non-IL-17 cytokine; (3) modulation of secretion of IL-17; (4) modulation of surface expression of a cellular adhesion molecule; (5) modulation of a proinflammatory cytokine; (6) modulation of a hematopoietic cytokine; (7) modulation of the development or differentiation of a FDRG-expressing cell; (8) modulation of the development or differentiation of a non- FDRG-expressing cell; (9) modulation of the homeostasis of a FDRG-expressing cell; (10) modulation of the homeostasis of a non- FDRG-expressing cell; (11) modulation of adipocyte development and physiology; and (12) modulation of insulin signaling.
  • an antisense nucleic acid comprises a nucleotide sequence which is complementary to a "sense" nucleic acid encoding a protein, e.g., complementary to the coding strand of a double-stranded cDNA molecule or complementary to an mRNA sequence. Accordingly, an antisense nucleic acid can hydrogen bond to a sense nucleic acid.
  • the antisense nucleic acid can be complementary to an entire FDRG coding strand, or to only a portion thereof.
  • an antisense nucleic acid molecule is antisense to a "coding region" of the coding strand of a nucleotide sequence encoding FDRG.
  • the term "coding region” refers to the region of the nucleotide sequence comprising codons which are translated into amino acid residues (e.g., the coding region of human FDRG corresponds to SEQ ID NO:3 and the coding region of murine FDRG corresponds to SEQ ID NO:13).
  • the antisense nucleic acid molecule is antisense to a "noncoding region" of the coding strand of a nucleotide sequence encoding FDRG.
  • noncoding region refers to 5' and 3' sequences which flank the coding region that are not translated into amino acids (i.e., also referred to as 5' and 3' untranslated regions). Given the coding strand sequences encoding FDRG disclosed herein (e.g., SEQ ID NO: 1
  • antisense nucleic acids of the invention can be designed according to the rules of Watson and Crick base pairing.
  • the antisense nucleic acid molecule can be complementary to the entire coding region of FDRG mRNA, but more preferably is an oligonucleotide which is antisense to only a portion of the coding or noncoding region of FDRG mRNA.
  • the antisense oligonucleotide can be complementary to the region surrounding the translation start site of FDRG mRNA.
  • An antisense oligonucleotide can be, for example, about 5, 10, 15, 20, 25, 30, 35, 40, 45 or 50 nucleotides in length.
  • an antisense nucleic acid of the invention can be constructed using chemical synthesis and enzymatic ligation reactions using procedures known in the art.
  • an antisense nucleic acid e.g., an antisense oligonucleotide
  • an antisense nucleic acid can be chemically synthesized using naturally occurring nucleotides or variously modified nucleotides designed to increase the biological stability of the molecules or to increase the physical stability of the duplex formed between the antisense and sense nucleic acids, e.g., phosphorothioate derivatives and acridine substituted nucleotides can be used.
  • modified nucleotides which can be used to generate the antisense nucleic acid include 5-fluorouracil, 5-bromouracil, 5-chlorouracil, 5-iodouracil, hypoxanthine, xantine, 4-acetylcytosine, 5-(carboxyhydroxylmethyl) uracil, 5- carboxymethylaminomethyl-2-thiouridine, 5-carboxymethylaminomethyluracil, dihydrouracil, beta-D-galactosylqueosine, inosine,
  • N6-isopentenyladenine 1-methylguanine, 1-methylinosine, 2,2-dimethylguanine, 2-methyladenine, 2-methylguanine, 3-methylcytosine, 5-methylcytosine, N6-adenine, 7-methylguanine, 5-methylaminomethyluracil, 5-methoxyaminomethyl-2-thiouracil, beta-D-mannosylqueosine, 5'-methoxycarboxymethyluracil, 5-methoxyuracil, 2-methylthio-N6-isopentenyladenine, uracil-5-oxyacetic acid (v), wybutoxosine, pseudouracil, queosine, 2-thiocytosine, 5-methyl-2-thiouracil, 2-thiouracil, 4-thiouracil, 5-methyluracil, uracil-5- oxyacetic acid methylester, uracil-5-oxyacetic.acid (v), 5-methyl-2-thiouracil, 3-(3-
  • the antisense nucleic acid can be produced biologically using an expression vector into which a nucleic acid has been subcloned in an antisense orientation (i.e., RNA transcribed from the inserted nucleic acid will be of an antisense orientation to a target nucleic acid of interest, described further in the following subsection).
  • the antisense nucleic acid molecules of the invention are typically administered to a subject or generated in situ such that they hybridize with or bind to cellular mRNA and/or genomic DNA encoding a FDRG protein to thereby inhibit expression of the protein, e.g., by inhibiting transcription and/or translation.
  • the hybridization can be by conventional nucleotide complementarity to form a. stable duplex, or, for example, in the case of an antisense nucleic acid molecule which binds to DNA duplexes, through specific interactions in the major groove of the double helix.
  • An example of a route of administration of antisense nucleic acid molecules of the invention include direct injection at a tissue site.
  • antisense nucleic acid molecules can be modified to target selected cells and then administered systemically.
  • antisense molecules can be modified such that they specifically bind to receptors or antigens expressed on a selected cell surface, e.g., by linking the antisense nucleic acid molecules to peptides or antibodies which bind to cell surface receptors or antigens.
  • the antisense nucleic acid molecules can also be delivered to cells using the vectors described herein. To achieve sufficient intracellular concentrations of the antisense molecules, vector constructs in which the antisense nucleic acid molecule is placed under the control of a strong pol II or pol III promoter are preferred.
  • the antisense nucleic acid molecule of the invention is an ⁇ -anomeric nucleic acid molecule.
  • An ⁇ -anomeric nucleic acid molecule forms specific double-stranded hybrids with complementary RNA in which, contrary to the usual ⁇ -units, the strands run parallel to each other (Gaultier et al. (1987) Nucleic Acids. Res. 15:6625-6641).
  • the antisense nucleic acid molecule can also comprise a 2'-o- methylribonucleotide (Inoue et al (1987) Nucleic Acids Res. 15:6131-6148) or a chimeric RNA-DNA analogue (Inoue et al (1987) FEBS Lett.
  • an antisense nucleic acid of the invention is a ribozyme.
  • Ribozymes are catalytic RNA molecules with ribonuclease activity which are capable of cleaving a single-stranded nucleic acid, such as an mRNA, to which they have a complementary region.
  • ribozymes e.g., hammerhead ribozymes (described in Haselhoff and Gerlach (1988) Nature 334:585-591)) can be used to catalytically cleave FDRG mRNA transcripts to thereby inhibit translation of FDRG mRNA.
  • a ribozyme having specificity for a FDRG-encoding nucleic acid can be designed based upon the nucleotide sequence of a FDRG cDNA disclosed herein (i.e., SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:ll, SEQ ID NO: 13, SEQ ID NO :14, or the DNA insert of the plasmid deposited with ATCC as Accession Number 98632).
  • a derivative of a Tetrahymena L-19 IVS RNA can be constructed in which the nucleotide sequence of the active site is complementary to the nucleotide sequence to be cleaved in a FDRG-encoding mRNA.
  • FDRG mRNA can be used to select a catalytic RNA having a specific ribonuclease activity from a pool of RNA molecules. See, e.g., Bartel, D. and Szostak, J.W. (1993) Science 261:1411- 1418.
  • FDRG gene expression can be inhibited by targeting nucleotide sequences complementary to the regulatory region of the FDRG (e.g., the FDRG promoter and/or enhancers) to form triple helical structures that prevent transcription of the FDRG gene in target cells.
  • nucleotide sequences complementary to the regulatory region of the FDRG e.g., the FDRG promoter and/or enhancers
  • FDRG promoter and/or enhancers nucleotide sequences complementary to the regulatory region of the FDRG
  • the nucleic acids of FDRG can be modified at the base moiety, sugar moiety or phosphate backbone to improve, e.g., the stability, hybridization, or solubility of the molecule.
  • the deoxyribose phosphate backbone of the nucleic acids can be modified to generate peptide nucleic acids (see Hyrup B. et al (1996) Bioorganic & Medicinal Chemistry 4 (1): 5-23).
  • peptide nucleic acids refer to nucleic acid mimics, e.g., DNA mimics, in which the deoxyribose phosphate backbone is replaced by a pseudopeptide backbone and only the four natural nucleobases are retained.
  • the neutral backbone of PNAs has been shown to allow for specific hybridization to DNA and RNA under conditions of low ionic strength.
  • the synthesis of PNA oligomers can be performed using standard solid phase peptide synthesis protocols as described in Hyrup B. et al. (1996) supra; Perry-O'Keefe et al PNAS 93: 14670-675.
  • PNAs of FDRG can be used therapeutic and diagnostic applications.
  • PNAs can be used as antisense or antigene agents for sequence-specific modulation of gene expression by, e.g., inducing trascription or translation arrest or inhibiting replication.
  • PNAs of FDRG can also be used, e.g., in the analysis of single base pair mutations in a gene by, e.g., PNA directed PCR clamping; as 'artificial restriction enzymes when used in combination with other enzymes, e.g. , S 1 nucleases (Hyrup B. (1996) supra); or as probes or primers for DNA sequence and hybridization (Hyrup B. et al (1996) supra; Perry-O'Keefe supra).
  • PNAs of FDRG can be modified, e.g., to enhance their stability or cellular uptake, by attaching lipophilic or other helper groups to PNA, by the formation of PNA-DNA chimeras, or by the use of liposomes or other techniques of drug delivery known in the art.
  • PNA-DNA chimeras of FDRG can be generated which may combine the advantageous properties of PNA and DNA.
  • Such chimeras allow DNA recognition enzymes, e.g., RNAse H and DNA polymerases, to interact with the DNA portion while the PNA portion would provide high binding affinity and specificity.
  • PNA-DNA chimeras can be linked using linkers of appropriate lengths selected in terms of base stacking, number of bonds between the nucleobases, and orientation (Hyrup B. (1996) supra).
  • the synthesis of PNA-DNA chimeras can be performed as described in Hyrup B. (1996) supra and Finn P.J. et al. (1996) Nucleic Acids Research 24 (17): 3357-63.
  • a DNA chain can be synthesized on a solid support using standard phosphoramidite coupling chemistry and modified nucleoside analogs, e.g., 5'-(4-methoxytrityl)amino-5'-deoxy-thymidine phosphoramidite, can be used as a between the PNA and the 5' end of DNA (Mag, M. et al. (1989) Nucleic Acid Res. 17: 5973-88). PNA monomers are then coupled in a stepwise manner to produce a chimeric molecule with a 5' PNA segment and a 3' DNA segment (Finn P.J. et al. (1996) supra).
  • chimeric molecules can be synthesized with a 5' DNA segment and a 3' PNA segment (Peterser, K.H. et al. (1975) Bioorganic Med. Chem. Lett. 5: 1119-11124).
  • the oligonucleotide may include other appended groups such as peptides (e.g., for targeting host cell receptors in vivo), or agents facilitating transport across the cell membrane (see, e.g. , Letsinger et al. , 1989, Proc. Natl. Acad. Sci. U.S.A. 86:6553-6556; Lemaitre et al, 1987, Proc. Natl. Acad. Sci. 84:648-652; PCT Publication No. W088/09810, published December 15, 1988) or the blood-brain barrier (see, e.g., PCT Publication No. W089/10134, published April 25, 1988).
  • other appended groups such as peptides (e.g., for targeting host cell receptors in vivo), or agents facilitating transport across the cell membrane (see, e.g. , Letsinger et al. , 1989, Proc. Natl. Acad. Sci. U.S.
  • oligonucleotides can be modified with hybridization-triggered cleavage agents (See, e.g., Krol et al, 1988, BioTechniques 6:958-976) or intercalating agents. (See, e.g., Zon, 1988, Pharm. Res. 5:539-549).
  • the oligonucleotide may be conjugated to another molecule, e.g., a peptide, hybridization triggered cross-linking agent, transport agent, hybridization-triggered cleavage agent, etc.
  • the present invention also features isolated "genes” corresponding to the nucleic acid molecules of SEQ ID NO:l, SEQ ID NO:3, SEQ ID O:4, SEQ ID NO:ll, SEQ ID NO:13 or SEQ ID NO: 14.
  • isolated gene includes a nucleic acid molecule comprising introns and exons which is separated from genomic DNA sequences which naturally flank the gene (i.e., sequences located at the 5' and 3' ends of the naturally- occurring gene) in the genomic DNA of the organism from which the isolated gene is derived.
  • an isolated gene corresponding, for example, to the isolated nucleic acid molecules of SEQ ID NO:l 1, SEQ ID NO:13 or SEQ ID NO:14 is set forth as SEQ ID NO:27 and described in Example 7 herein.
  • an isolated gene "corresponding to" the isolated nucleic acid molecules of SEQ ID NO:l 1, SEQ ID NO: 13 or SEQ ID NO: 14 includes an isolated gene having a nucleotide sequence which includes fragments of contiguous nucleotides of the nucleic acid sequence of the isolated nucleic acid molecules of SEQ ID NO:l l, SEQ ID NO:13 or SEQ ID NO:14 (e.g., cDNA sequence corresponding to exons in the isolated gene), such fragments being interspersed with nucleotide sequence not set forth in SEQ ID NO:l 1, SEQ ID NO: 13 or SEQ ID NO.T4 (e.g., cDNA sequence corresponding to introns in the isolated gene).
  • the present invention features an isolated gene corresponding to SEQ ID NO: 11 , SEQ ID NO: 13 or SEQ ID NO: 14.
  • the invention features an isolated gene comprising the nucleotide sequence of SEQ ID NO: 27.
  • the present invention features an isolated gene corresponding to SEQ ID NO:l, SEQ ID NO:3 or SEQ ID NO:4.
  • Isolated FDRG Proteins and Anti-FDRG Antibodies One aspect of the invention pertains to isolated FDRG proteins, and biologically active portions thereof, as well as polypeptide fragments suitable for use as immunogens to raise anti-FDRG antibodies.
  • native FDRG proteins can be isolated from cells or tissue sources by an appropriate purification scheme using standard protein purification techniques.
  • FDRG proteins are produced by recombinant DNA techniques.
  • a FDRG protein or polypeptide can be synthesized chemically using standard peptide synthesis techniques.
  • an “isolated” or “purified” protein or biologically active portion thereof is substantially free of cellular material or other contaminating proteins from the cell or tissue source from which the FDRG protein is derived, or substantially free from chemical precursors or other chemicals when chemically synthesized.
  • the language “substantially free of cellular material” includes preparations of FDRG protein in which the protein is separated from cellular components of the cells from which it is isolated or recombinantly produced.
  • the language "substantially free of cellular material” includes preparations of FDRG protein having less than about 30% (by dry weight) of non-FDRG protein (also referred to herein as a "contaminating protein"), more preferably less than about 20% of non-FDRG protein, still more preferably less than about 10% of non-FDRG protein, and most preferably less than about 5% non- FDRG protein.
  • non-FDRG protein also referred to herein as a "contaminating protein”
  • FDRG protein or biologically active portion thereof is recombinantly produced, it is also preferably substantially free of culture medium, i.e., culture medium represents less than about 20%, more preferably less than about 10%>, and most preferably less than about 5% of the volume of the protein preparation.
  • the language “substantially free of chemical precursors or other chemicals” includes preparations of FDRG protein in which the protein is separated from chemical precursors or other chemicals which are involved in the synthesis of the protein.
  • the language “substantially free of chemical precursors or other chemicals” includes preparations of FDRG protein having less than about 30% (by dry weight) of chemical precursors or non-FDRG chemicals, more preferably less than about 20% chemical precursors or non-FDRG chemicals, still more preferably less than about 10% chemical precursors or non-FDRG chemicals, and most preferably less than about 5% chemical precursors or non-FDRG chemicals.
  • Biologically active portions of a FDRG protein include peptides comprising amino acid sequences sufficiently homologous to or derived from the amino acid sequence of the FDRG protein, e.g., the amino acid sequence shown in SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12 or SEQ ID NO:15, which include less amino acids than the full length FDRG proteins, and exhibit at least one activity of a FDRG protein.
  • biologically active portions comprise a domain or motif with at least one activity of the FDRG protein.
  • a biologically active portion of a FDRG protein can be a polypeptide which is, for example, 10, 25, 50, 100 or more amino acids in length.
  • a biologically active portion of a FDRG protein comprises at least a C-terminal fibrinogen-like domain. In yet another embodiment, a biologically active portion of a FDRG protein comprises at least a signal sequence. In an alternative embodiment, a biologically active portion of a FDRG protein comprises a FDRG amino acid sequence lacking a signal sequence.
  • a preferred biologically active portion of a FDRG protein of the present invention may contain at least one of the above-identified structural domains.
  • a more preferred biologically active portion of a FDRG protein may contain at least two of the above-identified structural domains.
  • An even more preferred biologically active portion of a FDRG protein may contain at least three or more of the above-identified structural domains.
  • biologically active portions in which other regions of the protein are deleted, can be prepared by recombinant techniques and evaluated for one or more of the functional activities of a native FDRG protein.
  • the FDRG protein has an amino acid sequence shown in SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO: 12 or SEQ ID NO: 15.
  • the FDRG protein is substantially homologous to SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12 or SEQ ID NO:15 and retains the functional activity of the protein of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12 or SEQ ID NO:15 yet differs in amino acid sequence due to natural allelic variation or mutagenesis, as described in detail in subsection I above.
  • the FDRG protein is a protein which comprises an amino acid sequence at least about 60% homologous to the amino acid sequence of SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO: 12 or SEQ ID
  • the protein is at least about 70% homologous to SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO: 12 or SEQ ID NO: 15, more preferably at least about 80% homologous to SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12 or SEQ ID NO:15, even more preferably at least about 90% homologous to SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12 or SEQ ID NO:15, and most preferably at least about 95% or more homologous to SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO:12 or SEQ ID NO:15.
  • sequences are aligned for optimal comparison purposes (e.g., gaps can be introduced in the sequence of a first amino acid or nucleic acid sequence for optimal alignment with a second amino or nucleic acid sequence and non-homologous sequences can be disregarded for comparison purposes).
  • the length of a reference sequence aligned for comparison purposes is at least 30%, preferably at least 40%, more preferably at least 50%, even more preferably at least 60%, and even more preferably at least 70%, 80%, or 90% of the length of the reference sequence (e.g., when aligning a second sequence to the FDRG amino acid sequence of SEQ ID NO:2, having 86 amino acid residues, at least 66, preferably at least 46, more preferably at least 26 are aligned). The amino acid residues or nucleotides at corresponding amino acid positions or nucleotide positions are then compared.
  • amino acid or nucleic acid "homology” is equivalent to amino acid or nucleic acid "identity”).
  • the comparison of sequences and determination of percent homology between two sequences can be accomplished using a mathematical algorithim.
  • a preferred, non- limiting example of a mathematical algorithim utilized for the comparison of sequences is the algorithm of Karlin and Altschul (1990) Proc. Natl. Acad. Sci. USA 87:2264-68, modified as in Karlin and Altschul (1993) Proc. Natl. Acad. Sci. USA 90:5873-77. Such an algorithm is incorporated into the NBLAST and XBLAST programs (version 2.0) of Altschul, et al (1990) J. Mol. Biol. 215:403-10.
  • Gapped BLAST can be utilized as described in Altschul et al, (1997) Nucleic Acids Research 25(17):3389-3402. When utilizing BLAST and Gapped BLAST programs, the default parameters of the respective programs (e.g. , XBLAST and NBLAST) can be used.
  • a mathematical algorithim utilized for the comparison of sequences is the algorithm of Myers and Miller, CABIOS (1989). Such an algorithm is incorporated into the ALIGN program (version 2.0) which is part of the GCG sequence alignment software package.
  • ALIGN program version 2.0
  • a PAM 120 weight residue table, a gap length penalty of 12, and a gap penalty of 4 can be used.
  • a PAM 250 residue weight Table, a GAP penalty of 10, and a GAP length penalty of 10 can be used.
  • a mathematical algorithim utilized for the comparison of sequences is the algorithm of Wilbur-Lipmann which is part of Meg AlignTM sequence alignment software.
  • a FDRG "chimeric protein” or “fusion protein” comprises a FDRG polypeptide operatively linked to a non-FDRG polypeptide.
  • a "FDRG polypeptide” refers to a polypeptide having an amino acid sequence corresponding to FDRG
  • a non- FDRG polypeptide refers to a polypeptide having an amino acid sequence corresponding to a protein which is not substantially homologous to the FDRG protein, e.g., a protein which is different from the FDRG protein and which is derived from the same or a different organism.
  • a FDRG fusion protein can correspond to all or a portion of a FDRG protein.
  • a FDRG fusion protein comprises at least one biologically active portion of a FDRG protein.
  • a FDRG fusion protein comprises at least two biologically active portions of a FDRG protein.
  • a FDRG fusion protein comprises at least three biologically active portions of a FDRG protein.
  • the term "operatively linked" is intended to indicate that the FDRG polypeptide and the non-FDRG polypeptide are fused in-frame to each other.
  • the non-FDRG polypeptide can be fused to the N-terminus or C-terminus of the FDRG polypeptide.
  • the fusion protein is a GST-FDRG fusion protein in which the FDRG sequences are fused to the C-terminus of the GST sequences.
  • Such fusion proteins can facilitate the purification of recombinant FDRG.
  • the fusion protein is a FDRG protein containing a heterologous signal sequence at its N-terminus.
  • the native FDRG signal sequence i.e, about amino acids 1 to 25 of SEQ ID NO:2
  • the fusion protein is a FDRG-immunoglobulin fusion protein in which the FDRG sequences comprising primarily the FDRG extracellular domain are fused to sequences derived from a member of the immunoglobulin protein family.
  • Soluble derivatives have also been made of cell surface glycoproteins in the immunoglobulin gene superfamily consisting of an extracellular domain of the cell surface glycoprotein fused to an immunoglobulin constant (Fc) region (see e.g., Capon, D.J. et al (1989) Nature 337:525-531 and Capon U.S. Patents 5,116,964 and 5,428,130 [CD4-IgGl constructs]; Linsley, P.S. et al (1991) J. Exp. Med. 173:721-730 [a CD28-IgGl construct and a B7-l-IgGl construct]; and Linsley, P.S. et al (1991) J. Exp. Med.
  • Fc immunoglobulin constant
  • fusion proteins have proven useful for modulating receptor-ligand interactions.
  • Soluble derivatives of cell surface proteins of the tumor necrosis factor receptor (TNFR) superfamily proteins have been made consisting of an extracellular domain of the cell surface receptor fused to an immunoglobulin constant (Fc) region (see for example Moreland et al. (1997) N. Engl. J. Med. 337(3): 141-147; van der Poll et al (1997) Blood 89(10):3727-3734; and Ammann et al (1997) J. Clin. Invest.
  • FDRG-immunoglobulin fusion proteins of the invention can be inco ⁇ orated into pharmaceutical compositions and administered to a subject to inhibit an interaction between a FDRG protein and a FDRG receptor on the surface of a cell, to thereby suppress FDRG-mediated cellular function in vivo.
  • the FDRG-immunoglobulin fusion proteins can be used to affect the bioavailability of a FDRG protein. Inhibition of the FDRG protein/FDRG receptor interaction may be useful therapeutically, for example, in regulation of the cellular immune response, regulation of inflammation, regulation of hematopoiesis, regulation of adipogenesis, or regulation of angiogenesis.
  • the FDRG-immunoglobulin fusion proteins of the invention can be used as immunogens to produce anti-FDRG antibodies in a subject, to purify FDRG receptors and in screening assays to identify molecules which inhibit the interaction of a FDRG protein with a FDRG receptor.
  • a FDRG chimeric or fusion protein of the invention is produced by standard recombinant DNA techniques.
  • DNA fragments coding for the different polypeptide sequences are ligated together in-frame in accordance with conventional techniques, for example by employing blunt-ended or stagger-ended termini for ligation, restriction enzyme digestion to provide for appropriate termini, filling-in of cohesive ends as appropriate, alkaline phosphatase treatment to avoid undesirable joining, and enzymatic ligation.
  • the fusion gene can be synthesized by conventional techniques including automated DNA synthesizers.
  • PCR amplification of gene fragments can be carried out using anchor primers which give rise to complementary overhangs between two consecutive gene fragments which can subsequently be annealed and reamplified to generate a chimeric gene sequence (see, for example, Current Protocols in Molecular Biology, eds. Ausubel et al John Wiley & Sons: 1992).
  • anchor primers which give rise to complementary overhangs between two consecutive gene fragments which can subsequently be annealed and reamplified to generate a chimeric gene sequence
  • many expression vectors are commercially available that already encode a fusion moiety (e.g., a GST polypeptide).
  • a FDRG- encoding nucleic acid can be cloned into such an expression vector such that the fusion moiety is linked in-frame to the FDRG protein.
  • the present invention also pertains to variants of the FDRG proteins which function as either FDRG agonists (mimetics) or as FDRG antagonists.
  • Variants of the FDRG protein can be generated by mutagenesis, e.g., discrete point mutation or truncation of the FDRG protein.
  • An agonist of the FDRG protein can retain substantially the same, or a subset, of the biological activities of the naturally occurring form of the FDRG protein.
  • An antagonist of the FDRG protein can inhibit one or more of the activities of the naturally occurring form of the FDRG protein by, for example, competitively binding to a FDRG receptor of FDRG-binding protein.
  • specific biological effects can be elicited by treatment with a variant of limited function.
  • treatment of a subject with a variant having a subset of the biological activities of the naturally occurring form of the protein has fewer side effects in a subject relative to treatment with the naturally occurring form of the FDRG proteins.
  • variants of the FDRG protein which function as either
  • FDRG agonists or as FDRG antagonists can be identified by screening combinatorial libraries of mutants, (e.g., truncation mutants) of the FDRG protein for FDRG protein agonist or antagonist activity.
  • a variegated library of FDRG variants is generated by combinatorial mutagenesis at the nucleic acid level and is encoded by a variegated gene library.
  • a variegated library of FDRG variants can be produced by, for example, enzymatically ligating a mixture of synthetic oligonucleotides into gene sequences such that a degenerate set of potential FDRG sequences is expressible as individual polypeptides, or alternatively, as a set of larger fusion proteins (e.g., for phage display) containing the set of FDRG sequences therein.
  • a degenerate set of potential FDRG sequences is expressible as individual polypeptides, or alternatively, as a set of larger fusion proteins (e.g., for phage display) containing the set of FDRG sequences therein.
  • degenerate set of genes allows for the provision, in one mixture, of all of the sequences encoding the desired set of potential FDRG sequences.
  • Methods for synthesizing degenerate oligonucleotides are known in the art (see, e.g., Narang, S.A. (1983) Tetrahedron 39:3; Itakura et al (1984) Annu. Rev. Biochem. 53:323; Itakura et al (1984) Science 198:1056; Ike et al. (1983) Nucleic Acid Res. 11 :477.
  • libraries of fragments of the FDRG protein coding sequence can be used to generate a variegated population of FDRG fragments for screening and subsequent selection of variants of a FDRG protein.
  • a library of coding sequence fragments can be generated by treating a double stranded PCR fragment of a FDRG coding sequence with a nuclease under conditions wherein nicking occurs only about once per molecule, denaturing the double stranded DNA, renaturing the DNA to form double stranded DNA, which can include sense/antisense pairs from different nicked products, removing single stranded portions from reformed duplexes by treatment with SI nuclease, and ligating the resulting fragment library into an expression vector.
  • an expression library can be derived which encodes N-terminal, C-terminal and internal fragments of various sizes of the FDRG protein.
  • Recrusive ensemble mutagenesis (REM), a new technique which enhances the frequency of functional mutants in the libraries, can be used in combination with the screening assays to identify FDRG variants (Arkin and Yourvan (1992) PNAS 59:7811-7815; Delgrave et al (1993) Protein Engineering 6(3):327-331).
  • cell based assays can be exploited to analyze a variegated FDRG library.
  • a library of expression vectors can be transfected into a cell line which ordinarily secretes FDRG protein. Supernatants from the transfected cells are then contacted with FDRG-responsive cells and the effect of the mutation in FDRG can be detected, e.g., by measuring any of a number of FDRG-responsive cell responses. Plasmid DNA can then be recovered from the mutant FDRG-secreting cells which score for inhibition, or alternatively, potentiation of the FDRG-dependent response, and the individual clones further characterized.
  • an isolated FDRG protein, or a portion or fragment thereof, can be used as an immunogen to generate antibodies that bind FDRG using standard techniques for polyclonal and monoclonal antibody preparation.
  • the full-length FDRG protein can be used or, alternatively, the invention provides antigenic peptide fragments of FDRG for use as immunogens.
  • the antigenic peptide of FDRG comprises at least 8 amino acid residues of the amino acid sequence shown in SEQ ID NO:2, SEQ ID NO:5, SEQ ID NO :12 or SEQ ID NO: 15 and encompasses an epitope of FDRG such that an antibody raised against the peptide forms a specific immune complex with FDRG.
  • the antigenic peptide comprises at least 10 amino acid residues, more preferably at least 15 amino acid residues, even more preferably at least 20 amino acid residues, and most preferably at least 30 amino acid residues.
  • a FDRG immunogen typically is used to prepare antibodies by immunizing a suitable subject, (e.g., rabbit, goat, mouse or other mammal) with the immunogen.
  • An appropriate immunogenic preparation can contain, for example, recombinantly expressed FDRG protein or a chemically synthesized FDRG polypeptide.
  • the preparation can further include an adjuvant, such as Freund's complete or incomplete adjuvant, or similar immunostimulatory agent. Immunization of a suitable subject with an immunogenic FDRG preparation induces a polyclonal anti-FDRG antibody response. Accordingly, another aspect of the invention pertains to anti-FDRG antibodies.
  • antibody refers to immunoglobulin molecules and immunologically active portions of immunoglobulin molecules, i.e., molecules that contain an antigen binding site which specifically binds (immunoreacts with) an antigen, such as FDRG.
  • immunologically active portions of immunoglobulin molecules include F(ab) and F(ab')2 fragments which can be generated by treating the antibody with an enzyme such as pepsin.
  • the invention provides polyclonal and monoclonal antibodies that bind FDRG.
  • monoclonal antibody or “monoclonal antibody composition”, as used herein, refers to a population of antibody molecules that contain only one species of an antigen binding site capable of immunoreacting with a particular epitope of FDRG.
  • a monoclonal antibody composition thus typically displays a single binding affinity for a particular FDRG protein with which it immunoreacts.
  • Polyclonal anti-FDRG antibodies can be prepared as described above by immunizing a suitable subject with a FDRG immunogen. The anti-FDRG antibody titer in the immunized subject can be monitored over time by standard techniques, such as with an enzyme linked immunosorbent assay (ELISA) using immobilized FDRG.
  • ELISA enzyme linked immunosorbent assay
  • the antibody molecules directed against FDRG can be isolated from the mammal (e.g., from the blood) and further purified by well known techniques, such as protein A chromatography to obtain the IgG fraction.
  • antibody -producing cells can be obtained from the subject and used to prepare monoclonal antibodies by standard techniques, such as the hybridoma technique originally described by Kohler and Milstein (1975) Nature 256:495-497) (see also, Brown et al (1981) J. Immunol 127:539-46; Brown et al (1980) J Biol.
  • an immortal cell line typically a myeloma
  • lymphocytes typically splenocytes
  • the immortal cell line e.g., a myeloma cell line
  • the immortal cell line is derived from the same mammalian species as the lymphocytes.
  • murine hybridomas can be made by fusing lymphocytes from a mouse immunized with an immunogenic preparation of the present invention with an immortalized mouse cell line.
  • Preferred immortal cell lines are mouse myeloma cell lines that are sensitive to culture medium containing hypoxanthine, aminopterin and thymidine ("HAT medium").
  • HAT medium culture medium containing hypoxanthine, aminopterin and thymidine
  • Any of a number of myeloma cell lines can be used as a fusion partner according to standard techniques, e.g., the P3-NSl/l-Ag4-l, P3-x63-Ag8.653 or Sp2/O-Agl4 myeloma lines. These myeloma lines are available from ATCC.
  • HAT-sensitive mouse myeloma cells are fused to mouse splenocytes using polyethylene glycol ("PEG").
  • PEG polyethylene glycol
  • Hybridoma cells resulting from the fusion are then selected using HAT medium, which kills unfused and unproductively fused myeloma cells (unfused splenocytes die after several days because they are not transformed).
  • Hybridoma cells producing a monoclonal antibody of the invention are detected by screening the hybridoma culture supernatants for antibodies that bind FDRG, e.g., using a standard ELISA assay.
  • a monoclonal anti-FDRG antibody can be identified and isolated by screening a recombinant combinatorial immunoglobulin library (e.g., an antibody phage display library) with FDRG to thereby isolate immunoglobulin library members that bind FDRG.
  • Kits for generating and screening phage display libraries are commercially available (e.g. , the Pharmacia Recombinant Phage Antibody System, Catalog No. 27- 9400-01 ; and the Stratagene SurfZAPTM Phage Display Kit, Catalog No. 240612).
  • examples of methods and reagents particularly amenable for use in generating and screening antibody display library can be found in, for example, Ladner et al U.S. Patent No. 5,223,409; Kang et al. PCT International Publication No. WO 92/18619; Dower et al PCT International Publication No. WO 91/17271; Winter et al PCT International Publication WO 92/20791; Markland et al PCT International PubhcationNo. WO 92/15679; Breitling et al PCT International Publication WO 93/01288; McCafferty et al. PCT International Publication No.
  • recombinant anti-FDRG antibodies such as chimeric and humanized monoclonal antibodies, comprising both human and non-human portions, which can be made using standard recombinant DNA techniques, are within the scope of the invention.
  • Such chimeric and humanized monoclonal antibodies can be produced by recombinant DNA techniques known in the art, for example using methods described in Robinson et al. International Application No. PCT/US 86/02269; Akira, et al. European Patent Application 184,187; Taniguchi, M., European Patent Application 171,496; Morrison et al. European Patent Application 173,494; Neuberger et al. PCT International Publication No. WO 86/01533; Cabilly et al. U.S. Patent No. 4,816,567; Cabilly et al. European Patent Application 125,023; Better et al (1988) Science
  • Patent 5,225,539 Jones et al. (1986) Nature 321:552-525; Verhoeyan et al. (1988) Science 239:1534; and Beidler et al. (1988) J. Immunol 141:4053-4060.
  • An anti-FDRG antibody (e.g., monoclonal antibody) can be used to isolate FDRG by standard techniques, such as affinity chromatography or immunoprecipitation.
  • An anti-FDRG antibody can facilitate the purification of natural FDRG from cells and of recombinantly produced FDRG expressed in host cells.
  • an anti-FDRG antibody can be used to detect FDRG protein (e.g., in a cellular lysate or cell supernatant) in order to evaluate the abundance and pattern of expression of the FDRG protein.
  • Anti-FDRG antibodies can be used diagnostically to monitor protein levels in tissue as part of a clinical testing procedure, e.g. , to, for example, determine the efficacy of a given treatment regimen.
  • Detection can be facilitated by coupling (i.e., physically linking) the antibody to a detectable substance.
  • detectable substances include various enzymes, prosthetic groups, fluorescent materials, luminescent materials, bioluminescent materials, and radioactive materials.
  • suitable enzymes include horseradish peroxidase, alkaline phosphatase, ⁇ -galactosidase, or acetylcholinesterase;
  • suitable prosthetic group complexes include streptavidin/biotin and avidin/biotin;
  • suitable fluorescent materials include umbelliferone, fluorescein, fluorescein isothiocyanate, rhodamine, dichlorotriazinylamine fluorescein, dansyl chloride or phycoerythrin;
  • an example of a luminescent material includes luminol;
  • bioluminescent materials include luciferase, luciferin, and aequorin, and examples of suitable radioactive material include 125 I,
  • vectors preferably expression vectors, containing a nucleic acid encoding FDRG (or a portion thereof).
  • vector refers to a nucleic acid molecule capable of transporting another nucleic acid to which it has been linked.
  • plasmid refers to a circular double stranded DNA loop into which additional DNA segments can be ligated.
  • viral vector Another type of vector is a viral vector, wherein additional DNA segments can be ligated into the viral genome.
  • Certain vectors are capable of autonomous replication in a host cell into which they are introduced (e.g., bacterial vectors having a bacterial origin of replication and episomal mammalian vectors).
  • vectors e.g. , non-episomal mammalian vectors
  • Other vectors are integrated into the genome of a host cell upon introduction into the host cell, and thereby are replicated along with the host genome.
  • certain vectors are capable of directing the expression of genes to which they are operatively linked.
  • Such vectors are referred to herein as "expression vectors".
  • expression vectors of utility in recombinant DNA techniques are often in the form of plasmids.
  • plasmid and vector can be used interchangeably as the plasmid is the most commonly used form of vector.
  • the invention is intended to include such other forms of expression vectors, such as viral vectors (e.g., replication defective retroviruses, adenoviruses and adeno- associated viruses), which serve equivalent functions.
  • the recombinant expression vectors of the invention comprise a nucleic acid of the invention in a form suitable for expression of the nucleic acid in a host cell, which means that the recombinant expression vectors include one or more regulatory sequences, selected on the basis of the host cells to be used for expression, which is operatively linked to the nucleic acid sequence to be expressed.
  • "operably linked" is intended to mean that the nucleotide sequence of interest is linked to the regulatory sequence(s) in a manner which allows for expression of the nucleotide sequence (e.g., in an in vitro transcription/translation.system or in a host cell when the vector is introduced into the host cell).
  • regulatory sequence is intended to includes promoters, enhancers and other expression control elements (e.g., polyadenylation signals). Such regulatory sequences are described, for example, in Goeddel; Gene Expression Technology: Methods in Enzymology 185, Academic Press, San Diego, CA (1990). Regulatory sequences include those which direct constitutive expression of a nucleotide sequence in many types of host cell and those which direct expression of the nucleotide sequence only in certain host cells (e.g., tissue-specific regulatory sequences). It will be appreciated by those skilled in the art that the design of the expression vector can depend on such factors as the choice of the host cell to be transformed, the level of expression of protein desired, etc.
  • the expression vectors of the invention can be introduced into host cells to thereby produce proteins or peptides, including. fusion proteins or. peptides, encoded by nucleic acids as described herein (e.g., FDRG proteins, mutant forms of FDRG, fusion proteins, etc.).
  • the recombinant expression vectors of the invention can be designed for expression of FDRG in prokaryotic or eukaryotic cells.
  • FDRG can be expressed in bacterial cells such as E. coli, insect cells (using baculovirus expression vectors) yeast cells or mammalian cells. Suitable host cells are discussed further in Goeddel, Gene Expression Technology: Methods in Enzymology 185, Academic Press, San Diego, CA (1990).
  • the recombinant expression vector can be transcribed and translated in vitro, for example using T7 promoter regulatory sequences and T7 polymerase. Expression of proteins in prokaryotes is most often carried out in E. coli with vectors containing constitutive or inducible promotors directing the expression of either fusion or non-fusion proteins. Fusion vectors add a number of amino acids to a protein, encoded therein, usually to the amino terminus of the recombinant protein. Such fusion vectors typically serve three purposes: 1) to increase expression of recombinant protein; 2) to increase the solubility of the recombinant protein; and 3) to aid in the purification of the recombinant protein by acting as a ligand in affinity purification.
  • a proteolytic cleavage site is introduced at the junction of the fusion moiety and the recombinant protein to enable separation of the recombinant protein from the fusion moiety subsequent to purification of the fusion protein.
  • enzymes, and their cognate recognition sequences include Factor Xa, thrombin and enterokinase.
  • Typical fusion expression vectors include pGEX (Pharmacia Biotech Inc; Smith, D.B. and Johnson, K.S.
  • fusion proteins can be utilized in FDRG activity assays, in FDRG ligand binding (e.g., direct assays or competitive assays described in detail below), to generate antibodies specific for FDRG proteins, as examples.
  • a FDRG fusion expressed in a retro viral expression vector of the present invention can be utilized to infect bone marrow cells which are subsequently transplanted into irradiated recipients. The pathology of the subject recipient is then examined after sufficient time has passed (e.g., six (6) weeks).
  • Suitable inducible non-fusion E. coli expression vectors include pTrc (Amann et al, (1988) Gene 69:301-315) and pET 1 Id (Studier et al, Gene Expression Technology: Methods in Enzymology 185, Academic Press, San Diego, California (1990) 60-89).
  • Target gene expression from the pTrc vector relies on host RNA polymerase transcription from a hybrid trp-lac fusion promoter.
  • Target gene expression from the pET l id vector relies on transcription from a T7 gnlO-lac fusion promoter mediated by a coexpressed viral RNA polymerase (T7 gnl). This viral polymerase is supplied by host strains BL21(DE3) or HMS174(DE3) from a resident ⁇ prophage harboring a T7 gnl gene under the transcriptional control of the lacUV 5 promoter.
  • One strategy to maximize recombinant protein expression in E. coli is to express the protein in a host bacteria with an impaired capacity to proteolytically cleave the recombinant protein (Gottesman, S., Gene Expression Technology: Methods in Enzymology 185, Academic Press, San Diego, California (1990) 119-128).
  • Another strategy is to alter the nucleic acid sequence of the nucleic acid to be inserted into an expression vector so that the individual codons for each amino acid are those preferentially utilized in E. coli (Wada et al, (1992) Nucleic Acids Res. 20:2111-2118). Such alteration of nucleic acid sequences of the invention can be carried out by standard DNA synthesis techniques.
  • the FDRG expression vector is a yeast expression vector.
  • yeast expression vectors for expression in yeast S. cerivisae include pYepSecl (Baldari, et al, (1987) EMBOJ. 6:229-234), pMFa (Kurjan and Herskowitz, (1982) Cell 30:933-943), pJRY88 (Schultz et al, (1987) Gene 54:113-123), pYES2 ( ⁇ nvitrogen Corporation, San Diego, CA), and picZ (InVitrogen Corp, Carlsbad, CA).
  • FDRG can be expressed in insect cells using baculovirus expression vectors.
  • Baculovirus vectors available for expression of proteins in cultured insect cells include the pAc series (Smith et al. (1983) Mol Cell Biol 3:2156-2165) and the pVL series (Lucklow and Summers (1989) Virology 170:31 -39).
  • a nucleic acid of the invention is expressed in mammalian cells using a mammalian expression vector. Examples of mammalian expression vectors include pCDM8 (Seed, B. (1987) Nature 329:840) and pMT2PC (Kaufman et al. (1987) EMBOJ.
  • the expression vector's control functions are often provided by viral regulatory elements.
  • viral regulatory elements For example, commonly used promoters are derived from polyoma, Adenovirus 2, cytomegalovirus and Simian Virus 40.
  • promoters are derived from polyoma, Adenovirus 2, cytomegalovirus and Simian Virus 40.
  • suitable expression systems for both prokaryotic and eukaryotic cells see chapters 16 and 17 of Sambrook, J., Fritsh, E. F., and Maniatis, T. Molecular Cloning: A Laboratory Manual. 2nd, ed, Cold Spring Harbor Laboratory, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, 1989.
  • the recombinant mammalian expression vector is capable of directing expression of the nucleic acid preferentially in a particular cell type (e.g., tissue-specific regulatory elements are used to express the nucleic acid).
  • tissue-specific regulatory elements are known in the art.
  • suitable tissue-specific promoters include the albumin promoter (liver-specific; Pinkert et al. (1987) Genes Dev. 1:268-277), lymphoid-specific promoters (Calame and Eaton (1988) Adv. Immunol. 43:235-275), in particular promoters of T cell receptors (Winoto and Baltimore (1989) EMBO J.
  • promoters are also encompassed, for example the murine hox promoters (Kessel and Grass (1990) Science 249:374-379) and the ⁇ -fetoprotein promoter (Campes and Tilghman (1989) Genes Dev. 3:537-546).
  • the invention further provides a recombinant expression vector comprising a DNA molecule of the invention cloned into the expression vector in an antisense orientation. That is, the DNA molecule is operatively linked to a regulatory sequence in a manner which allows for expression (by transcription of the DNA molecule) of an RNA molecule which is antisense to FDRG mRNA. Regulatory sequences operatively linked to a nucleic acid cloned in the antisense orientation can be chosen which direct the continuous expression of the antisense RNA molecule in a variety of cell types, for instance viral promoters and/or enhancers, or regulatory sequences can be chosen which direct constitutive, tissue specific or cell type specific expression of antisense RNA.
  • the antisense expression vector can be in the form of a recombinant plasmid, phagemid or attenuated virus in which antisense nucleic acids are produced under the control of a high efficiency regulatory region, the activity of which can be determined by the cell type into which the vector is introduced.
  • a high efficiency regulatory region the activity of which can be determined by the cell type into which the vector is introduced.
  • host cell and "recombinant host cell” are used interchangeably herein. It is understood that such terms refer not only to the particular subject cell but to the progeny or potential progeny of such a cell. Because certain modifications may occur in succeeding generations due to either mutation or environmental influences, such progeny may not, in fact, be identical to the parent cell, but are still included within the scope of the term as used herein.
  • a host cell can be any prokaryotic or eukaryotic cell.
  • FDRG protein can be expressed in bacterial cells such as E. coli, insect cells, yeast or mammalian cells (such as Chinese hamster ovary cells (CHO) or COS cells). Other suitable host cells are known to those skilled in the art.
  • Vector DNA can be introduced into prokaryotic or eukaryotic cells via conventional transformation or transfection techniques.
  • transformation and “transfection” are intended to refer to a variety of art-recognized techniques for introducing foreign nucleic acid (e.g.
  • DNA into a host cell, including calcium phosphate or calcium chloride co-precipitation, DEAE-dextran-mediated transfection, lipofection, or electroporation.
  • Suitable methods for transforming or transfecting host cells can be found in Sambrook, et ⁇ al (Molecular Cloning: A Laboratory Manual 2nd, ed., Cold Spring Harbor Laboratory, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, 1989), and other laboratory manuals.
  • a gene that encodes a selectable marker (e.g., resistance to antibiotics) is generally introduced into the host cells along with the gene of interest.
  • selectable markers include those which confer resistance to drugs, such as G418, hygromycin and methotrexate.
  • Nucleic acid encoding a selectable marker can be introduced into a host cell on the same vector as that encoding FDRG or can be introduced on a separate vector. Cells stably transfected with the introduced nucleic acid can be identified by drug selection (e.g., cells that have incorporated the selectable marker gene will survive, while the other cells die).
  • a host cell of the invention such as a prokaryotic or eukaryotic host cell in culture, can be used to produce (i.e., express) FDRG protein.
  • the invention further provides methods for producing FDRG protein using the host cells of the invention.
  • the method comprises culturing the host cell of invention (into which a recombinant expression vector encoding FDRG has been introduced) in a suitable medium such that FDRG protein is produced.
  • the method further comprises isolating FDRG from the medium or the host cell.
  • the host cells of the invention can also be used to produce nonhuman transgenic animals.
  • a host cell of the invention is a fertilized oocyte or an embryonic stem cell into which FDRG-coding sequences have been introduced.
  • Such host cells can then be used to create non-human transgenic animals in which exogenous FDRG sequences have been introduced into their genome or homologous recombinant animals in which endogenous FDRG sequences have been altered.
  • Such animals are useful for studying the function and/or activity of FDRG and for identifying and/or evaluating modulators of FDRG activity.
  • a "transgenic animal” is a non-human animal, preferably a mammal, more preferably a rodent such as a rat or mouse, in which one or more of the cells of the animal includes a transgene.
  • Other examples of transgenic animals include non-human primates, sheep, dogs, cows, goats, chickens, amphibians, etc.
  • a transgene is exogenous DNA which is integrated into the genome of a cell from which a transgenic animal develops and which remains in the genome of the mature animal, thereby directing the expression of an encoded gene product in one or more cell types or tissues of the transgenic animal.
  • a "homologous recombinant animal” is a non-human animal, preferably a mammal, more preferably a mouse, in which an endogenous FDRG gene has been altered by homologous recombination between the endogenous gene and an exogenous DNA molecule introduced into a cell of the animal, e.g. , an embryonic cell of the animal, prior to development of the animal.
  • a transgenic animal of the invention can be created by introducing FDRG- encoding nucleic acid into the male pronuclei of a fertilized oocyte, e.g., by microinjection, retro viral infection, and allowing the oocyte to develop in a pseudopregnant female foster animal.
  • the FDRG cDNA sequences of SEQ ID NO.T, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO:13, SEQ ID NO.T4, or the DNA insert of the plasmid deposited with ATCC as Accession Number 98632 can be introduced as a transgene into the genome of a non-human animal. Intronic sequences and polyadenylation signals can also be included in the transgene to increase the efficiency of expression of the transgene.
  • a tissue-specific regulatory sequence(s) can be operably linked to the FDRG transgene to direct expression of FDRG protein to particular cells.
  • transgenic animals via embryo manipulation and microinjection, particularly animals such as mice
  • U.S. Patent Nos. 4,736,866 and 4,870,009 both by Leder et al
  • U.S. Patent No. 4,873,191 by Wagner et al. and in Hogan, B., Manipulating the Mouse Embryo, (Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y., 1986). Similar methods are used for production of other transgenic animals.
  • a transgenic founder animal can be identified based upon the presence of the FDRG transgene in its genome and/or expression of FDRG mRNA in tissues or cells of the animals.
  • a transgenic founder animal can then be used to breed additional animals carrying the transgene.
  • transgenic animals carrying a transgene encoding FDRG can further be bred to other transgenic animals carrying other transgenes.
  • a vector which contains at least a portion of a FDRG gene into which a deletion, addition or substitution has been introduced to thereby alter, e.g., functionally disrupt, the FDRG gene.
  • the FDRG gene can be a human gene (e.g. , the cDNA of SEQ ID NO: 1 , SEQ ID NO:3 or SEQ ID NO:4), but more preferably, is a non-human homologue of a human FDRG gene.
  • a mouse FDRG gene e.g.
  • the cDNA of SEQ ID NO: 11 , SEQ ID NO: 13 or SEQ ID NO: 14 can be used to construct a homologous recombination vector suitable for altering an endogenous FDRG gene in the mouse genome.
  • the vector is designed such that, upon homologous recombination, the endogenous FDRG gene is functionally disrupted (i.e., no longer encodes a functional protein; also referred to as a "knock out" vector).
  • the vector can be designed such that, upon homologous recombination, the endogenous FDRG gene is mutated or otherwise altered but still encodes functional protein (e.g., the upstream regulatory region can be altered to thereby alter the expression of the endogenous FDRG protein).
  • the altered portion of the FDRG gene is flanked at its 5' and 3' ends by additional nucleic acid of the FDRG gene to allow for homologous recombination to occur between the exogenous FDRG gene carried by the vector and an endogenous FDRG gene in an embryonic stem cell.
  • the additional flanking FDRG nucleic acid is of sufficient length for successful homologous recombination with the endogenous gene.
  • flanking DNA both at the 5' and 3' ends
  • flanking DNA both at the 5' and 3' ends
  • the vector is introduced into an embryonic stem cell line (e.g., by electroporation) and cells in which the introduced FDRG gene has homologously recombined with the endogenous FDRG gene are selected (see e.g., Li, E. et al (1992) Cell 69:915).
  • the selected cells are then injected into a blastocyst of an animal (e.g., a mouse) to form aggregation chimeras (see e.g., Bradley, A. in Teratocarcinomas and Embryonic Stem Cells: A Practical Approach, E.J. Robertson, ed. (IRL, Oxford, 1987) pp. 113-152).
  • a chimeric embryo can then be implanted into a suitable pseudopregnant female foster animal and the embryo brought to term.
  • Progeny harboring the homologously recombined DNA in their germ cells can be. used to breed animals in which all cells of the animal contain the homologously recombined DNA by germline transmission of the transgene.
  • Methods for constructing homologous recombination vectors and homologous recombinant animals are described further in Bradley, A. (1991) Current Opinion in Biotechnology 2:823-829 and in PCT International
  • transgenic non-humans animals can be produced which contain selected systems which allow for regulated expression of the transgene.
  • a system is the cre/loxP recombinase system of bacteriophage PI.
  • cre/loxP recombinase system of bacteriophage PI.
  • a recombinase system is the FLP recombinase system of Saccharomyces cerevisiae (O'Gorman et al. (1991) Science 251:1351-1355.
  • mice containing transgenes encoding both the Cre recombinase and a selected protein are required.
  • Such animals can be provided through the construction of "double" transgenic animals, e.g. , by mating two transgenic animals, one containing a transgene encoding a selected protein and the other containing a transgene encoding a recombinase.
  • Clones of the non-human transgenic animals described herein can also be produced according to the methods described in Wilmut, I. et al (1997) Nature 385:810- 813 and PCT Publication Numbers WO 97/07668 and WO 97/07669.
  • a cell e.g., a somatic cell
  • the quiescent cell can then be fused, e.g., through the use of electrical pulses, to an enucleated oocyte from an animal of the same species from which the quiescent cell is isolated.
  • the recontructed oocyte is then cultured such that it develops to morula or blastocyte and then transferred to pseudopregnant female foster animal.
  • the offspring borne of this female foster animal will be a clone of the animal from which the cell, e.g., the somatic cell, is isolated.
  • compositions The FDRG nucleic acid molecules, FDRG proteins, and anti-FDRG antibodies
  • compositions suitable for administration typically comprise the nucleic acid molecule, protein, or antibody and a pharmaceutically acceptable carrier.
  • pharmaceutically acceptable carrier is intended to include any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like, compatible with pharmaceutical administration. The use of such media and agents for pharmaceutically active substances is well known in the art. Except insofar as any conventional media or agent is incompatible with the active compound, use thereof in the compositions is contemplated. Supplementary active compounds can also be incorporated into the compositions.
  • a pharmaceutical composition of the invention is formulated to be compatible with its intended route of administration.
  • routes of administration include parenteral, e.g., intravenous, intradermal, subcutaneous, oral (e.g., inhalation), transdermal (topical), transmucosal, and rectal administration.
  • Solutions or suspensions used for parenteral, intradermal, or subcutaneous application can include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and- agents for the adjustment of tonicity such as sodium chloride or dextrose. pH can be adjusted with acids or bases, such as hydrochloric acid or sodium hydroxide.
  • a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents
  • antibacterial agents such as benzyl alcohol or methyl parabens
  • compositions suitable for injectable use include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion.
  • suitable carriers include physiological saline, bacteriostatic water, Cremophor ELTM (BASF, Parsippany, NJ) or phosphate buffered saline (PBS). In all cases, the composition must be sterile and should be fluid to the extent that easy syringability exists.
  • the carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyetheylene glycol, and the like), and suitable mixtures thereof.
  • the proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.
  • Prevention of the action of microorganisms can be achieved by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like.
  • isotonic agents for example, sugars, polyalcohols such as manitol, sorbitol, sodium chloride in the composition.
  • Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent which delays absorption, for example, aluminum monostearate and gelatin.
  • Sterile injectable solutions can be prepared by incorporating the active compound (e.g. , a FDRG protein or anti-FDRG antibody) in the required amount in an . appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered sterilization.
  • the active compound e.g. , a FDRG protein or anti-FDRG antibody
  • dispersions are prepared by incorporating the active compound into a sterile vehicle which contains a basic dispersion medium and the required other ingredients from those enumerated above.
  • the preferred methods of preparation are vacuum drying and freeze-drying which yields a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.
  • Oral compositions generally include an inert diluent or an edible carrier. They can be enclosed in gelatin capsules or compressed into tablets. For the purpose of oral therapeutic administration, the active compound can be incorporated with excipients and used in the form of tablets, troches, or capsules. Oral compositions can also be prepared using a fluid carrier for use as a mouthwash, wherein the compound in the fluid carrier is applied orally and swished and expectorated or swallowed. Pharmaceutically compatible binding agents, and/or adjuvant materials can be included as part of the composition.
  • the tablets, pills, capsules, troches and the like can contain any of the following ingredients, or compounds of a similar nature: a binder such as microcrystalline cellulose, gum tragacanth or gelatin; an excipient such as starch or lactose, a disintegrating agent such as alginic acid, PrimogelTM, or corn starch; a , lubricant such as magnesium stearate or Sterotes; a glidant such as colloidal silicon dioxide; a sweetening agent such as sucrose or saccharin; or a flavoring agent such as peppermint, methyl salicylate, or orange flavoring.
  • a binder such as microcrystalline cellulose, gum tragacanth or gelatin
  • an excipient such as starch or lactose, a disintegrating agent such as alginic acid, PrimogelTM, or corn starch
  • a lubricant such as magnesium stearate or Sterotes
  • a glidant such as colloidal silicon dioxide
  • the compounds are delivered in the form of an aerosol spray from pressured container or dispenser which contains a suitable propellant, e.g. , a gas such as carbon dioxide, or a nebulizer.
  • a suitable propellant e.g. , a gas such as carbon dioxide, or a nebulizer.
  • Systemic administration can also be by transmucosal or transdermal means.
  • penetrants appropriate to the barrier to be permeated are used in the formulation.
  • penetrants are generally known in the art, and include, for example, for transmucosal administration, detergents, bile salts, and fusidic acid derivatives.
  • Transmucosal administration can be accomplished through the use of nasal sprays or suppositories.
  • the active compounds are formulated into ointments, salves, gels, or creams as generally known in the art.
  • the compounds can also be prepared in the form of suppositories (e.g. , with conventional suppository bases such as cocoa butter and other glycerides) or retention enemas for rectal delivery.
  • suppositories e.g. , with conventional suppository bases such as cocoa butter and other glycerides
  • retention enemas for rectal delivery.
  • the active compounds are prepared with carriers that will protect the compound against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems.
  • a controlled release formulation including implants and microencapsulated delivery systems.
  • Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and polylactic acid. Methods for preparation of such formulations will be apparent to those skilled in the art.
  • the materials can also be obtained commercially from Alza Corporation and Nova Pharmaceuticals, Inc.
  • Liposomal suspensions (including liposomes targeted to infected cells with monoclonal antibodies to viral antigens) can also be used as pharmaceutically acceptable carriers. These can be prepared according to methods known to those skilled in the art, for example, as described in U.S.. Patent No. 4,522,811.
  • Dosage unit form refers to physically discrete units suited as unitary dosages for the subject to be treated; each unit containing a predetermined quantity of active compound calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier.
  • the specification for the dosage unit forms of the invention are dictated by and directly dependent on the unique characteristics of the active compound and the particular therapeutic effect to be achieved, and the limitations inherent in the art of compounding such an active compound for the treatment of individuals.
  • Toxiciry and therapeutic efficacy of such compounds can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., for determining the LD50 (the dose lethal to 50% of the population) and the ED50 (the dose therapeutically effective in 50% of the population).
  • the dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio
  • LD50/ED50 Compounds which exhibit large therapeutic indices are preferred. While compounds that exhibit toxic side effects may be used, care should be taken to design a delivery system that targets such compounds to the site of affected tissue in order to minimize potential damage to uninfected cells and, thereby, reduce side effects.
  • the data obtained from the cell culture assays and> nimal studies can be used in formulating a range of dosage for use in humans.
  • the dosage of such compounds lies preferably within a range of circulating concentrations that include the ED50 with little or no toxicity. The dosage may vary within this range depending upon the dosage form employed and the route of administration utilized.
  • the therapeutically effective dose can be estimated initially from cell culture assays.
  • a dose may be formulated in animal models to achieve a circulating plasma concentration range that includes the IC50 (i.e., the concentration of the test compound which achieves a half-maximal inhibition of symptoms) as determined in cell culture. Such information can be used to more accurately determine useful doses in humans. Levels in plasma may be measured, for example, by high performance liquid chromatography.
  • the nucleic acid molecules of the invention can be inserted into vectors and used as gene therapy vectors.
  • Gene therapy vectors can be delivered to a subject by, for example, intravenous injection, local administration (see U.S. Patent 5,328,470) or by stereotactic injection (see e.g. , Chen et al. (1994) PNAS 91 :3054-3057).
  • the pharmaceutical preparation of the gene therapy vector can include the gene therapy vector in an acceptable diluent, or can comprise a slow release matrix in which the gene delivery vehicle is imbedded.
  • the pharmaceutical preparation can include one or more cells which produce the gene delivery system.
  • the pharmaceutical compositions can be included in a container, pack, or dispenser together with instructions for administration.
  • nucleic acid molecules, proteins, protein homologues, and antibodies described herein can be used in one or more of the following methods: a) screening assays; b) detection assays (e.g., chromosomal mapping, tissue typing, forensic biology), c) predictive medicine (e.g., diagnostic assays, prognostic assays, monitoring clinical trials); and d) methods of treatment (e.g., therapeutic and prophylactic methods as well as such methods in the context of pharmacogenetics).
  • detection assays e.g., chromosomal mapping, tissue typing, forensic biology
  • predictive medicine e.g., diagnostic assays, prognostic assays, monitoring clinical trials
  • methods of treatment e.g., therapeutic and prophylactic methods as well as such methods in the context of pharmacogenetics.
  • a FDRG protein of the invention has one or more of the following activities: (i) interaction of a FDRG protein in the extracellular milieu with a non-FDRG protein molecule (e.g., a FDRG receptor) on the surface of the same cell which secreted the FDRG protein molecule; (ii) interaction of a FDRG protein in the extracellular milieu with a non- FDRG protein molecule (e.g.
  • a FDRG receptor on the surface of a different cell from that which secreted the FDRG protein molecule; (iii) complex formation between a FDRG protein and a FDRG receptor; (iv) complex formation between a FDRG protein and non-FDRG receptor; (v) modulation of signal transduction via a cell surface protein (e.g., a FDRG receptor); (vi) modulation of the expression of adipogenic genes; (vii) modulation of a PPAR ⁇ function or modulation by a PPAR ⁇ function; (viii) modulation of a cellular response to a PPAR ⁇ ligand (e.g., thiazolidinediones) and (ix) interaction of a FDRG protein with a second protein in the extracellular milieu (e.g., a FDRG binding protein).
  • a cell surface protein e.g., a FDRG receptor
  • modulation of signal transduction via a cell surface protein e.g., a
  • a FDRG protein, FDRG modulator, or FDRG receptor modulator can be used in, for example, (1) activation of a FDRG-dependent signal transduction pathway; (2) modulation of angiogenesis; (3) modulation of a hematopoiesis; (4) modulation of the development or differentiation of a FDRG-expressing cell (e.g., mediation of growth and/or differentiation of adipocytes, for example, white adipocytes or brown adipocytes); (5) modulation of the proliferation, development or differentiation of a non- FDRG-expressing cell; (6) modulation of the homeostasis of a FDRG- expressing cell; (7) modulation of insulin sensitivity and/or insulin responsiveness; (8) modulation of insulin secretion (9) modulation of cell recruitment; (10) modulation of the homeostasis of a non-FDRG-expressing cell; (11) modulation of glucose metabolism; (12) maintenance of energy homeostasis (e.g., regulating the balance and/or imbalance
  • the isolated nucleic acid molecules of the invention can be used, for example, to express FDRG protein (e.g. , via a recombinant expression vector in a host cell in gene therapy applications), to detect FDRG mRNA (e.g., in a biological sample) or a genetic alteration in a FDRG gene, and to modulate FDRG activity, as described further below.
  • FDRG protein e.g. , via a recombinant expression vector in a host cell in gene therapy applications
  • detect FDRG mRNA e.g., in a biological sample
  • a genetic alteration in a FDRG gene e.g., in a genetic alteration in a FDRG gene
  • the FDRG proteins can be used to screen drugs or compounds which modulate the FDRG activity as well as to treat disorders characterized by insufficient or excessive production of FDRG protein or production of FDRG protein forms which have decreased or aberrant activity compared to FDRG wild type protein (e.g., obesity and/or obesity-related disorders, diabetes and/or diabetes-related disorders, metabolic disorders, vascular disorders, differentiative or developmental disorders, proliferative disorders or cell recruitment disorders).
  • soluble forms of the FDRG protein can be used to bind membrane-bound FDRG receptors and influence bioavailability of such a receptors cognate ligand.
  • the anti-FDRG antibodies of the invention can be used to detect and isolate FDRG proteins and modulate FDRG activity.
  • the invention provides a method (also referred to herein as a "screening assay") for identifying modulators, i.e., candidate or test compounds or agents (e.g., peptides, peptidomimetics, small molecules or other drugs) which bind to FDRG proteins or have a stimulatory or inhibitory effect on, for example, FDRG expression or FDRG activity.
  • the invention provides assays for screening candidate or test compounds which bind to or modulate the activity of a FDRG protein or polypeptide or biologically active portion thereof.
  • the invention provides assays for screening candidate or test compounds which bind to or modulate the activity of a FDRG receptor.
  • test compounds of the present invention can be obtained using any of the numerous approaches in combinatorial library methods known in the art, including: biological libraries; spatially addressable parallel solid, phase or solution phase libraries; synthetic library methods requiring deconvolution; the 'one-bead one-compound' library method; and synthetic library methods using affinity chromatography selection.
  • biological libraries include biological libraries; spatially addressable parallel solid, phase or solution phase libraries; synthetic library methods requiring deconvolution; the 'one-bead one-compound' library method; and synthetic library methods using affinity chromatography selection.
  • the biological library approach is limited to peptide libraries, while the other four approaches are applicable to peptide, non-peptide oligomer or small molecule libraries of compounds (Lam, K.S. (1997) Anticancer Drug Des. 12:145).
  • an assay is a cell-based assay in which a cell which expresses FDRG is contacted with a test compound and the ability of the test compound to modulate FDRG expression and/or activity determined. Determining the ability of the compound to modulate FDRG expression can be accomplished, for example, by detecting the presence or absence or amount of a FDRG transcript of protein (e.g., using a probe based on the nucleotide sequences of the present invention or an anti-FDRG antibody). Determining the ability of the compound to modulate FDRG activity can be accomplished, for example, by detecting FDRG activity in cellular supernatants (e.g., contacting a second cell with the supernatants).
  • an assay is a cell-based assay in which a cell which expresses a FDRG receptor on the cell surface is contacted with a test compound and the ability of the test compound to bind to a FDRG receptor determined.
  • the cell for example, can be of mammalian origin or a yeast cell. Determining the ability of the test compound to bind to a FDRG receptor can be accomplished, for example, by coupling the test compound with a radioisotope or enzymatic label such that binding of the test compound to the FDRG receptor can be determined by detecting the labeled compound in a complex.
  • test compounds can be labeled with 125 I, 35 S, 14 C, or 3 H, either directly or indirectly, and the radioisotope detected by direct counting of radioemmission or by scintillation counting.
  • test compounds can be enzymatically labeled with, for example, horseradish peroxidase, alkaline phosphatase, or luciferase, and the enzymatic label detected by determination of conversion of an appropriate substrate to product. It is also within the scope of this invention to determine the ability of a test compound to interact with a FDRG receptor without the labeling of any of the interactants.
  • a microphysiometer can be used to detect the interaction of a test compound with a FDRG receptor without the labeling of either the test compound or the receptor. McConnell, H. M. et al (1992) Science 257:1906-1912.
  • a "microphysiometer” e.g., CytosensorTM
  • LAPS light-addressable potentiometric sensor
  • the assay comprises contacting a cell which expresses a FDRG receptor on the cell surface with a FDRG protein or biologically- active portion thereof, to form an assay mixture, contacting the assay mixture with a test compound, and determining the ability of the test compound to interact with a FDRG receptor, wherein determining the ability of the test compound to interact with a FDRG receptor comprises determining the ability of the test compound to preferentially bind to the FDRG receptor as compared to the ability of FDRG, or a biologically active portion thereof, to bind to the receptor.
  • the assay can comprise determining the ability of the test compound to modulate a cellular activity of FDRG and/or an FDRG receptor.
  • Determining the ability of the FDRG protein to bind to or interact with a FDRG target molecule, or to modulate a FDRG activity can be accomplished by one of the methods described above for determining direct binding.
  • determining the ability of the FDRG protein to bind to or interact with a FDRG target molecule can be accomplished by determining the activity of the target molecule.
  • the activity of the target molecule can be determined by detecting induction of a cellular second messenger of the target (i.e.
  • a reporter gene comprising a FDRG-responsive regulatory element operatively linked to a nucleic acid encoding a detectable marker, e.g. , luciferase
  • a cellular response for example, expression of a differentiated phenotype.
  • an assay of the present invention is a cell-free assay in which a FDRG protein or biologically active portion thereof is contacted with a test compound and the ability of the test compound to bind to the FDRG protein or biologically active portion thereof is determined. Binding of the test compound to the FDRG protein can be determined either directly or indirectly as described above.
  • the assay includes contacting the FDRG protein or biologically active portion thereof with a known compound which binds FDRG to form an assay mixture, contacting the assay mixture with a test compound, and determining the ability of the test compound to interact with a FDRG protein, wherein determining the ability of the test compound to interact with a FDRG protein comprises determining the ability of the test compound to preferentially bind to FDRG or biologically active portion thereof as compared to the known compound.
  • the assay is a cell-free assay in which FDRG protein or biologically active portion thereof is contacted with a test compound and the ability of the test compound to modulate (e.g., stimulate or inhibit) the activity of the FDRG protein or biologically active portion thereof is determined. Determining the ability of the test compound to modulate the activity of FDRG can be accomplished, for example, by determining the ability of the FDRG protein to bind to a. FDRG target molecule (e.g., a FDRG binding protein) by one of the methods described above for determining direct binding.
  • FDRG target molecule e.g., a FDRG binding protein
  • Determining the ability of the FDRG protein to bind to a FDRG target molecule can also be accomplished using a technology such as real-time Biomolocular Interaction Analysis (BIA).
  • BIOA Biomolocular Interaction Analysis
  • BIOA is a technology for studying biospecific interactions in real time, without labeling any of the interactants (e.g., BIAcoreTM). Changes in the optical phenomenon surface plasmon resonance (SPR) can be used as an indication of real-time reactions between biological molecules.
  • SPR surface plasmon resonance
  • determining the ability of the test compound to modulate the activity of FDRG can be accomplished by determining the ability of the FDRG protein to further modulate a FDRG target molecule.
  • the activity of the target molecule on a receptor can be determined as previously described.
  • the cell-free assay involves contacting the FDRG protein or biologically active portion thereof with a known compound which binds FDRG to form an assay mixture, contacting the assay mixture with a test compound, and determining the ability of the test compound to interact with a FDRG protein, wherein determining the ability of the test compound to interact with a FDRG protein comprises determining the ability of the FDRG protein to preferentially bind to or modulate the activity of a FDRG target molecule.
  • the cell-free assays of the present invention are amenable to use of both soluble and/or membrane-bound forms of isolated proteins (e.g. FDRG proteins or biologically active portions thereof or FDRG target molecules).
  • a membrane-bound form an isolated protein e.g., a FDRG target molecule or receptor
  • a solubilizing agent such that the membrane- bound form of the isolated protein is maintained in solution.
  • solubilizing agents include non-ionic detergents such as n-octylglucoside, n- dodecylglucoside, n-dodecylmaltoside, octanoyl-N-methylglucamide, decanoyl-N- methylglucamide, Triton® X-100, Triton® X-114, Thesit®, Isotridecypoly(ethylene glycol ether) n , 3-[(3-cholamidopropyl)dimethylamminio]-l-propane sulfonate
  • CHAPS 3-[(3-cholamidopropyl)dimethylammimo]-2-hydroxy-l-propane sulfonate
  • N-dodecyl N,N-dimethyl-3-ammonio-l -propane sulfonate.
  • FDRG FDRG
  • target molecule a test compound to FDRG
  • binding of a test compound to FDRG, or interaction of FDRG with a target molecule in the presence and absence of a candidate compound can be accomplished in any vessel suitable for containing the reactants. Examples of such vessels include microtitre plates, test tubes, and micro-centrifuge tubes.
  • a fusion protein can be provided which adds a domain that allows one or both of the proteins to be bound to a matrix.
  • glutathione-S-transferase/ FDRG fusion proteins or glutathione- S- transferase/target fusion proteins can be adsorbed onto glutathione sepharose beads (Sigma Chemical, St. Louis, MO) or glutathione derivatized microtitre plates, which are then combined with the test compound or the test compound and either the non-adsorbed target protein or FDRG protein, and the mixture incubated under conditions conducive to complex formation (e.g., at physiological conditions for salt and pH). Following incubation, the beads or microtitre plate wells are washed to remove any unbound components, the matrix immobilized in the case of beads, complex determined either directly or indirectly, for example, as described above. Alternatively, the complexes can be dissociated from the matrix, and the level of FDRG binding or activity determined using standard techniques.
  • FDRG or its target molecule can be immobilized utilizing conjugation of biotin and streptavidin.
  • Biotinylated FDRG or target molecules can be prepared from biotin-NHS (N-hydroxy-succinimide) using techniques well known in the art (e.g., biotinylation kit, Pierce Chemicals, Rockford, IL), and immobilized in the wells of streptavidin-coated 96 well plates (Pierce Chemical).
  • antibodies reactive with FDRG or target molecules but which do not interfere with binding of the FDRG protein to its target molecule can be derivatized to the wells of the plate, and unbound target or FDRG trapped in the wells by antibody conjugation.
  • Methods for detecting such complexes include immunodetection of complexes using antibodies reactive with the FDRG or target molecule, as well as enzyme-linked assays which rely on detecting an enzymatic activity associated with the FDRG or target molecule.
  • modulators of FDRG expression are identified in a method wherein a cell is contacted with a candidate compound and the expression of FDRG mRNA or protein in the cell is determined.
  • the level of expression of FDRG mRNA or protein in the presence of the candidate compound is compared to the level of expression of FDRG mRNA or protein in the absence of the candidate compound.
  • the candidate compound can then be identified as a modulator of FDRG expression based on this comparison. For example, when expression of FDRG mRNA or protein is greater (statistically significantly greater) in the presence of the candidate compound than in its absence, the candidate compound is identified as a stimulator of FDRG mRNA or protein expression.
  • the candidate compound when expression of FDRG mRNA or protein is less (statistically significantly less) in the presence of the candidate compound than in its absence, the candidate compound is identified as an inhibitor of FDRG mRNA or protein expression.
  • the level of FDRG mRNA or protein expression in the cells can be determined by methods described herein for detecting FDRG mRNA or protein.
  • the FDRG proteins can be used as "bait proteins" in a two-hybrid assay or three-hybrid assay (see, e.g., U.S. Patent No. 5,283,317; Zervos et al. (1993) Cell 72:223-232; Madura et al. (1993) J Biol. Chem.
  • FDRG-binding proteins FDRG-binding proteins
  • FDRG-binding proteins FDRG-binding proteins
  • Such FDRG-binding proteins are also likely to be involved in the propagation of signals by the FDRG proteins as, for example, downstream elements of a FDRG-mediated signaling pathway.
  • FDRG-binding proteins are likely to be cell-surface molecules associated with non-FDRG expressing cells, wherein such FDRG-binding proteins are involved in secondary cytokine production.
  • the two-hybrid system is based on the modular nature of most transcription factors, which consist of separable DNA-binding and activation domains.
  • the assay utilizes two different DNA constructs.
  • the gene that codes for FDRG is fused to a gene encoding the DNA binding domain of a known transcription factor (e.g., GAL-4).
  • a DNA sequence, from a library of DNA sequences, that encodes an unidentified protein (“prey" or "sample”) is fused to a gene that codes for the activation domain of the known transcription factor.
  • the DNA-binding and activation domains of the transcription factor are brought into close proximity. This proximity allows transcription of a reporter gene (e.g. , LacZ) which is operably linked to a transcriptional regulatory site responsive to the transcription factor. Expression of the reporter gene can be detected and cell colonies containing the functional transcription factor can be isolated and used to obtain the cloned gene which encodes the protein which interacts with FDRG.
  • a reporter gene e.g. , LacZ
  • This invention further pertains to novel agents identified by the above-described screening assays. Accordingly, it is within the scope of this invention to further use an agent identified as described herein in an appropriate animal model.
  • an agent identified as described herein e.g., a FDRG modulating agent, an antisense FDRG nucleic acid molecule, a FDRG-specific antibody, or a FDRG binding partner
  • an agent identified as described herein can be used in an animal model to determine the efficacy, toxicity, or side effects of treatment with such an agent.
  • an agent identified as described herein can be used in an animal model to determine the mechanism of action of such an agent.
  • this invention pertains to uses of novel agents identified by the above-described screening assays for treatments as described herein.
  • cDNA sequences identified herein can be used in numerous ways as polynucleotide reagents. For example, these sequences can be used to: (i) map their respective genes on a chromosome; and, thus, locate, gene regions associated with genetic disease; (ii) identify an individual from a minute biological sample (tissue typing); and (iii) aid in forensic identification of a biological sample. These applications are described in the subsections below.
  • this sequence can be used to map the location of the gene on a chromosome. This process is called chromosome mapping. Accordingly, portions or fragments of the FDRG, sequences, described herein, can be used to map the location of the FDRG genes, respectively, on a chromosome. The mapping of the FDRG sequences to chromosomes is an important first step in correlating these sequences with genes associated with disease.
  • FDRG genes can be mapped to chromosomes by preparing PCR primers (preferably 15-25 bp in length) from the FDRG sequences. Computer analysis of the FDRG sequences can be used to rapidly select primers that do not span more than one exon in the genomic DNA, thus complicating the amplification process. These primers can then be used for PCR screening of somatic cell hybrids containing individual human chromosomes. Only those hybrids containing the human gene corresponding to the FDRG sequences will yield an amplified fragment. Somatic cell hybrids are prepared by fusing somatic cells from different mammals (e.g., human and mouse cells).
  • PCR mapping of somatic cell hybrids is a rapid procedure for assigning a particular sequence to a particular chromosome. Three or more sequences can be assigned per day using a single thermal cycler. Using the FDRG sequences to design oligonucleotide primers, sublocalization can be achieved with panels of fragments from specific chromosomes. Other mapping strategies which can similarly be used to map a 9o, lp, or lv sequence to its chromosome include in situ hybridization (described in Fan, Y. et al. (1990) PNAS, 87:6223-27), pre-screening with labeled flow-sorted chromosomes, and pre-selection by hybridization to chromosome specific cDNA libraries.
  • Fluorescence in situ hybridization (FISH) of a DNA sequence to a metaphase chromosomal spread can further be used to provide a precise chromosomal location in one step.
  • Chromosome spreads can be made using cells whose division has been blocked in metaphase by a chemical like colcemid that disrupts the mitotic spindle.
  • the chromosomes can be treated briefly with trypsin, and then stained with Giemsa. A pattern of light and dark bands develops on each chromosome, so that the chromosomes can be identified individually.
  • the FISH technique can be used with a DNA sequence as short as 500 or 600 bases.
  • clones larger than 1,000 bases have a higher likelihood of binding to a unique chromosomal location with sufficient signal intensity for simple detection.
  • 1,000 bases, and more preferably 2,000 bases will suffice to get good results at a reasonable amount of time.
  • Reagents for chromosome mapping can be used individually to mark a single chromosome or a single site on that chromosome, or panels of reagents can be used for marking multiple sites and/or multiple chromosomes. Reagents corresponding to noncoding regions of the genes actually are preferred for mapping purposes (e.g., non coding sequences of the genomic DNA described in Example 7 herein). Coding sequences are more likely to be conserved within gene families, thus increasing the chance of cross hybridizations during chromosomal mapping.
  • differences in the DNA sequences between individuals affected and unaffected with a disease associated with the FDRG gene can be determined. If a mutation is observed in some or all of the affected individuals but not in any unaffected individuals, then the mutation is likely to be the causative agent of the particular disease. Comparison of affected and unaffected individuals generally- involves first looking for structural alterations in the chromosomes, such as deletions or translocations that are visible from chromosome spreads or detectable using PCR based on that DNA sequence. Ultimately, complete sequencing of genes from several individuals can be performed to confirm the presence of a mutation and to distinguish mutations from polymorphisms.
  • the FDRG sequences of the present invention can also be used to identify individuals from minute biological samples.
  • the United States military for example, is considering the use of restriction fragment length polymorphism (RFLP) for identification of its personnel.
  • RFLP restriction fragment length polymorphism
  • an individual's genomic DNA is digested with one or more restriction enzymes, and probed on a Southern blot to yield unique bands for identification.
  • This method does not suffer from the current limitations of "Dog Tags" which can be lost, switched, or stolen, making positive identification difficult.
  • the sequences of the present invention are useful as additional DNA markers for RFLP (described in U.S. Patent 5,272,057).
  • sequences of the present invention can be used to provide an alternative technique which determines the actual base-by -base DNA sequence of selected portions of an individual's genome.
  • the FDRG sequences described herein can be used to prepare two PCR primers from the 5' and 3'. ends of the sequences. These primers can then be used to amplify an individual's DNA and subsequently sequence it.
  • Panels of corresponding DNA sequences from individuals, prepared in this manner, can provide unique individual identifications, as each individual will have a unique set of such DNA sequences due to allelic differences.
  • the sequences of the present invention can be used to obtain such identification sequences from individuals and from tissue.
  • the FDRG sequences of the invention uniquely represent portions of ' the human genome. Allelic variation occurs to some degree in the coding regions of • these sequences, and to a greater degree in the noncoding regions. It is estimated that allelic variation between individual humans occurs with a frequency of about once per each 500 bases.
  • Each of the sequences described herein can, to some degree, be used as a standard against which DNA from an individual can be •compared for identification purposes.
  • the noncoding sequences of SEQ ID NO: 1 can comfortably provide positive individual identification with a panel of perhaps 10 to 1,000 primers which each yield a noncoding amplified sequence of 100 bases. If predicted coding sequences, such as those in SEQ ID NO:3 are used, a more appropriate number of primers for positive individual identification would be 500-2,000. If a panel of reagents from FDRG sequences described herein is used to generate a unique identification database for an individual, those same reagents can later be used to identify tissue from that individual. Using the unique identification database, positive identification of the individual, living or dead, can be made from extremely small tissue samples.
  • Forensic biology is a scientific field employing genetic typing of biological evidence found at a crime scene as a means for positively identifying, for example, a perpetrator of a crime.
  • PCR technology can be used to amplify DNA sequences taken from very small biological samples such as tissues, e.g., hair or skin, or body fluids, e.g., blood, saliva, or semen found at a crime scene.
  • the amplified sequence can then be compared to a standard, thereby allowing identification of the origin of the biological sample.
  • sequences of the present invention can be used to provide polynucleotide reagents, e.g., PCR primers, targeted to specific loci in the human genome, which can enhance the reliability of DNA-based forensic identifications by, for example, providing another "identification marker" (i.e. another DNA sequence that is unique to a particular individual).
  • an "identification marker” i.e. another DNA sequence that is unique to a particular individual.
  • actual base sequence information can be used for identification as an accurate alternative to patterns formed by restriction enzyme generated fragments.
  • Sequences targeted to noncoding regions of SEQ ID NO: 1 are particularly appropriate for this use as greater numbers of polymorphisms occur in the noncoding regions, making it easier to differentiate individuals using this technique.
  • polynucleotide reagents include the FDRG sequences or portions thereof, e.g., fragments derived from the noncoding regions of SEQ ID NO:l having a length of at least 20 bases, preferably at least 30 bases.
  • the FDRG sequences described herein can further be used to provide polynucleotide reagents, e.g., labeled or labelable probes which can be used in, for example, an in situ hybridization technique, to identify a specific tissue, e.g., brain tissue. This can be very useful in cases where a forensic pathologist is presented with a tissue of unknown origin. Panels of such FDRG probes can be used to identify tissue by species and/or by organ type. In a similar fashion, these reagents, e.g., FDRG primers or probes can be used to screen tissue culture for contamination (i.e. screen for the presence of a mixture of different types of cells in a culture).
  • the present invention also pertains to the field of predictive medicine in which diagnostic assays, prognostic assays, and monitoring clinical trials are used for prognostic (predictive) purposes to thereby treat an individual prophylactically.
  • diagnostic assays for determining FDRG protein and/or nucleic acid expression as well as FDRG activity, in the context of a biological sample (e.g., blood, serum, cells, tissue) to thereby determine whether an individual is afflicted with a disease or disorder, or is at risk of developing a disorder, associated with aberrant FDRG expression or activity.
  • a biological sample e.g., blood, serum, cells, tissue
  • the invention also provides for prognostic (or predictive) assays for determining whether an individual is at risk of developing a disorder associated with FDRG protein, nucleic acid expression or activity. For example, mutations in a FDRG gene can be assayed in a biological sample. Such assays can be used for prognostic or predictive purpose to thereby phophylactically treat an individual prior to the onset of a disorder characterized by or associated with FDRG protein, nucleic acid expression or activity. Another aspect of the invention pertains to monitoring the influence of agents
  • An exemplary method for detecting the presence or absence of FDRG in a biological sample involves obtaining a biological sample from a test subject and contacting the biological sample with a compound or an agent capable of detecting FDRG protein or nucleic acid (e.g., mRNA, genomic DNA) that encodes FDRG protein such that the presence of FDRG is detected in the biological sample.
  • a compound or an agent capable of detecting FDRG protein or nucleic acid e.g., mRNA, genomic DNA
  • a preferred agent for detecting FDRG mRNA or genomic DNA is a labeled nucleic acid probe capable of hybridizing to FDRG mRNA or genomic DNA.
  • the nucleic acid probe can be, for example, a full-length FDRG nucleic acid, such as the nucleic acid of SEQ ID NO:l, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:l 1, SEQ ID NO.T3, SEQ ID NO.T4, the DNA insert of the plasmid deposited with ATCC as Accession Number 98632, or a portion thereof, such as an oligonucleotide of at least 15, 30, 50, 100, 250 or 500 nucleotides in length and sufficient to specifically hybridize under stringent conditions to FDRG mRNA or genomic DNA.
  • Other suitable probes for use in the diagnostic assays of the invention are described herein.
  • a preferred agent for detecting FDRG protein is an antibody capable of binding to FDRG protein, preferably an antibody with a detectable label.
  • Antibodies can be polyclonal, or more preferably, monoclonal. An intact antibody, or a fragment thereof (e.g., Fab or F(ab')2) can be used.
  • the term "labeled", with regard to the probe or antibody, is intended to encompass direct labeling of the probe or antibody by coupling (i.e., physically linking) a detectable substance to the probe or antibody, as well as indirect labeling of the probe or antibody by reactivity with another reagent that is directly labeled.
  • Examples of indirect labeling include detection of a primary antibody using a fluorescently labeled secondary antibody and end-labeling of a DNA probe with biotin such that it can be detected with fluorescently labeled streptavidin.
  • biological sample is intended to include tissues, cells and biological fluids isolated from a subject, as well as tissues, cells and fluids present within a subject. That is, the detection method of the invention can be used to detect FDRG mRNA, protein, or genomic DNA in a biological sample in vitro. as well as in vivo.
  • in vitro techniques for detection of FDRG mRNA include Northern hybridizations and in situ hybridizations.
  • In vitro techniques for detection of FDRG protein include enzyme linked immunosorbent assays (ELISAs), Western blots, immunoprecipitations and immunofluorescence.
  • In vitro techniques for detection of FDRG genomic DNA include Southern hybridizations.
  • in vivo techniques for detection of FDRG protein include introducing into a subject a labeled anti-FDRG antibody.
  • the antibody can be labeled with a radioactive marker whose presence and location in a subject can be detected by standard imaging techniques.
  • the biological sample contains protein molecules from the test subject.
  • the biological sample can contain mRNA molecules from the test subject or genomic DNA molecules from the test subject.
  • a preferred biological sample is a serum sample isolated by conventional means from a subject.
  • the methods further involve obtaining a control biological sample from a control subject, contacting the control sample with a compound or agent capable of detecting FDRG protein, mRNA, or genomic DNA, such that the presence of FDRG protein, mRNA or genomic DNA is detected in the biological sample, and comparing the presence of FDRG protein, mRNA or genomic DNA in the control sample with the presence of FDRG protein, mRNA or genomic DNA in the test sample.
  • kits for detecting the presence of FDRG in a biological sample can comprise a labeled compound or agent capable of detecting FDRG protein or mRNA in a biological sample; means for determining the amount of FDRG in the sample; and means for comparing the amount of FDRG in the sample with a standard.
  • the compound or agent can be packaged in a suitable container.
  • the kit can further comprise instructions for using the kit to detect FDRG protein or nucleic acid.
  • the diagnostic methods described herein can furthermore be utilized to identify subjects having or at risk of developing a disease or disorder associated with aberrant FDRG expression or activity.
  • the assays described herein such as the preceding diagnostic assays or the following assays, can be utilized to identify a subject having or at risk of developing a disorder associated with FDRG protein, nucleic acid expression or activity such as a proliferative disorder, a differentiative or developmental disorder, a cell migration disorder or a hematopoietic disorder.
  • the present invention provides a method for identifying a disease or disorder associated with aberrant FDRG expression or activity in which a test sample is obtained from a subject and FDRG protein or nucleic acid (e.g, mRNA, genomic DNA) is detected, wherein the presence of FDRG protein or nucleic acid is diagnostic for a subject having or at risk of developing a disease or disorder associated with aberrant FDRG expression or activity.
  • a test sample refers to a biological sample obtained from a subject of interest.
  • a test sample can be a biological fluid (e.g., serum), cell sample, or tissue.
  • the prognostic assays described herein can be used to determine whether a subject can be administered an agent (e.g., an agonist, antagonist, peptidomimetic, protein, peptide, nucleic acid, small molecule, or other drug candidate) to treat a disease or disorder associated with aberrant FDRG expression or activity.
  • an agent e.g., an agonist, antagonist, peptidomimetic, protein, peptide, nucleic acid, small molecule, or other drug candidate
  • agents for a disorder such as a proliferative disorder, a differentiative or developmental disorder, a cell migration or recruitment disorder, or a hematopoietic disorder.
  • the present invention provides methods for determining whether a subject can be effectively treated with an agent for a disorder associated with aberrant FDRG expression or activity in which a test sample is obtained and FDRG protein or nucleic acid is detected (e.g. , wherein the presence of FDRG protein or nucleic acid is diagnostic for a subject that can be administered the agent to treat a disorder associated with aberrant FDRG expression or activity.)
  • the methods of the invention can also be used to detect genetic alterations in a FDRG gene, thereby determining if a subject with the altered gene is at risk for a disorder characterized by aberrant differentiation, aberrant angiogenesis, an aberrant proliferative response or an aberrant hematopoietic. response.
  • the methods include detecting, in a sample of cells from the subject, the presence or absence of a genetic alteration characterized by at least one of an alteration affecting the integrity of a gene encoding a FDRG protein, or the mis-expression of the FDRG gene.
  • such genetic alterations can be detected by ascertaining the existence of at least one of 1) a deletion of one or more nucleotides from a FDRG gene; 2) an addition of one or more nucleotides to a FDRG gene; 3) a substitution of one or more nucleotides of a FDRG gene, 4) a chromosomal rearrangement of a FDRG gene; 5) an alteration in the level of a messenger RNA transcript of a FDRG gene, 6) aberrant modification of a FDRG gene, such as of the methylation pattern of the genomic DNA, 7) the presence of a non- wild type splicing pattern of a messenger RNA transcript of a FDRG gene, 8) a non-wild type level of a FDRG protein, 9) allelic loss of a FDRG gene, and 10) inappropriate post-translational modification of a FDRG protein.
  • assay techniques known in the art which can be used
  • detection of the alteration involves the use of a probe/primer in a polymerase chain reaction (PCR) (see, e.g., U.S. Patent Nos. 4,683,195 and 4,683,202), such as anchor PCR or RACE PCR, or, alternatively, in a ligation chain reaction (LCR) (see, e.g., Landegran et al. (1988) Science 241:1077-1080; and Nakazawa et al. (1994) PNAS 91 :360-364), the latter of which can be particularly useful for detecting point mutations in the FDRG gene (see Abravaya et al. (1995) Nucleic Acids Res .23:675-682).
  • PCR polymerase chain reaction
  • LCR ligation chain reaction
  • This method can include the steps of collecting a sample of cells from a patient, isolating nucleic acid (e.g., genomic, mRNA or both) from the cells of the sample, contacting the nucleic acid sample with one or more primers which specifically hybridize to a FDRG gene under conditions such that hybridization and amplification of the FDRG gene (if present) occurs, and detecting the presence or absence of an amplification product, or detecting the size of the amplification product and comparing the length to a control sample.
  • nucleic acid e.g., genomic, mRNA or both
  • primers which specifically hybridize to a FDRG gene under conditions such that hybridization and amplification of the FDRG gene (if present) occurs
  • detecting the presence or absence of an amplification product or detecting the size of the amplification product and comparing the length to a control sample.
  • PCR and/or LCR may be desirable to use as a preliminary amplification step in conjunction with any of the techniques used for detecting
  • mutations in a FDRG gene from a sample cell can be identified by alterations in restriction enzyme cleavage patterns.
  • sample and control DNA is isolated, amplified (optionally), digested with one or more restriction endonucleases, and fragment length sizes are determined by gel electrophoresis and compared. Differences in fragment length sizes between sample and control DNA indicates mutations in the sample DNA.
  • sequence specific ribozymes see, for example, U.S. Patent No. 5,498,531 can be used to score for the presence of specific mutations by development or loss of a ribozyme cleavage site.
  • genetic mutations in FDRG can be identified by hybridizing a sample and control nucleic acids, e.g., DNA or RNA, to high density arrays containing hundreds or thousands of oligonucleotides probes (Cronin, M.T. et al (1996) Human Mutation 7: 244-255; Kozal, M.J. et al: (1996) Nature Medicine 2: 753- 759).
  • genetic mutations in FDRG can be identified in two dimensional arrays containing light-generated DNA probes as described in Cronin, M.T. et al supra.
  • a first hybridization array of probes can be used to scan through long stretches of DNA in a sample and control to identify base changes between the sequences by making linear arrays of sequential ovelapping probes. This step allows the identification of point mutations. This step is followed by a second hybridization array that allows the characterization of specific mutations by using smaller, specialized probe arrays complementary to all variants or mutations detected. Each mutation array is composed of parallel probe sets, one complementary to the wild-type gene and the other complementary to the mutant gene.
  • any of a variety of sequencing reactions known in the art can be used to directly sequence the FDRG gene and detect mutations by comparing the sequence of the sample FDRG with the corresponding wild-type (control) sequence.
  • Examples of sequencing reactions include those based on techniques developed by Maxim and Gilbert ((1977) PNAS 74:560) or Sanger ((1977) PNAS 74:5463). It is also contemplated that any of a variety of automated sequencing procedures can be utilized when performmg the diagnostic assays (Naeve et ⁇ .(1995) Biotechniques 19:448), including sequencing by mass spectromefry (see, e.g., PCT International Publication No. WO 94/16101; Cohen et al.
  • RNA/RNA or RNA/DNA heteroduplexes methods in which protection from cleavage agents is used to detect mismatched bases in RNA/RNA or RNA/DNA heteroduplexes.
  • Myers et al. (1985) Science 230:1242 methods in which protection from cleavage agents is used to detect mismatched bases in RNA/RNA or RNA/DNA heteroduplexes.
  • the art technique of "mismatch cleavage" starts by providing heteroduplexes of formed by hybridizing (labeled) RNA or DNA containing the wild-type FDRG sequence with potentially mutant RNA or DNA obtained from ⁇ tissue sample.
  • RNA/DNA duplexes can be treated with RNase and DNA/DNA hybrids treated with SI nuclease to enzymatically digesting the.mismatched regions.
  • either DNA/DNA or RNA/DNA duplexes can be treated with hydroxylamine or osmium tetroxide and with piperidine in order to digest mismatched regions. After digestion of the mismatched regions, the resulting material is then separated by size on denaturing polyacrylamide gels to determine the site of mutation.
  • control DNA or RNA can be labeled for detection.
  • the mismatch cleavage reaction employs one or more proteins that recognize mismatched base pairs in double-stranded DNA (so called "DNA mismatch repair" enzymes) in defined systems for. detecting and mapping point mutations in FDRG cDNAs obtained from samples of cells.
  • DNA mismatch repair enzymes
  • the mutY enzyme of E. coli cleaves A at G/A mismatches and the thymidine DNA glycosylase from HeLa cells cleaves T at G/T mismatches (Hsu et al. (1994) Carcinogenesis 15:1657-1662).
  • a probe based on a FDRG sequence e.g.
  • a wild-type FDRG sequence is hybridized to a cDNA or other DNA product from a test eell(s).
  • the duplex is treated with a DNA mismatch repair enzyme, and the cleavage products, if any, can be detected from electrophoresis protocols or the like. See, for example, U.S. Patent No. 5,459,039.
  • alterations in electrophoretic mobility will be used to identify mutations in FDRG genes.
  • SSCP single strand conformation polymorphism
  • Single-stranded DNA fragments of sample and control FDRG nucleic acids will be denatured and allowed to renature.
  • the secondary structure of single-stranded nucleic acids varies according to sequence, the resulting alteration in , .electrophoretic mobility enables the detection of even a single base change.
  • the DNA fragments may be labeled or detected with labeled probes.
  • the sensitivity of the assay ⁇ may be enhanced by using RNA (rather than DNA), in which the secondary structure is more sensitive to a change in sequence.
  • the subject method utilizes heteroduplex analysis to separate double istranded, heteroduplex molecules on the basis of changes in electrophoretic mobility (Keen etal. (1991) Trends Genet 7:5).
  • the movement of mutant or wild-type fragments in polyacrylamide gels containing a gradient of denaturant is assayed using denaturing gradient gel electrophoresis (DGGE) (Myers et al. (1985) Nature 313:495).
  • DGGE denaturing gradient gel electrophoresis
  • DNA will be modified to insure that it does not completely denature, for example by adding a GC clamp of approximately 40 bp of high-melting GC-rich DNA by PCR.
  • a temperature gradient is used in place of a denaturing gradient to identify differences in the mobility of control and sample DNA (Rosenbaum and Reissner (1987) Biophys Chem 265:12753).
  • oligonucleotide primers may be prepared in which the known mutation is placed centrally and then hybridized to target DNA under conditions which permit hybridization only if a perfect match is found (Saiki et al. (1986) Nature 324:163); Saiki et al. (1989) Proc. Natl Acad. Sci USA 86:6230).
  • Such allele specific oligonucleotides are hybridized to PCR amplified target DNA or a number of different mutations when the oligonucleotides are attached to the hybridizing membrane and hybridized with labeled target DNA.
  • Oligonucleotides used as primers for specific amplification may carry the mutation of interest in the center of the molecule (so that amplification depends on differential hybridization) (Gibbs et al. (1989) Nucleic Acids Res. 17:2437-2448) or at the extreme 3' end of one primer where, under appropriate conditions, mismatch can prevent, or reduce polymerase extension (Prossner (1993) Tibtech 11 :238).
  • amplification may also be performed using Taq ligase for amplification (Barany (1991) Proc. Natl. Acad. Sci USA 88:189). In such cases, ligation will occur only if there is a perfect match at the 3' end of the 5' sequence making it possible to detect the presence of a known mutation at a specific site by looking for the presence or absence of amplification.
  • FDRG nucleic acid ' molecules of the present invention can be used in diagnostic assays (e.g., genetic linkage analysis) of patients at risk or suspected to be at risk for ATHS and/or ML4.
  • the methods described herein may be performed, for example, by utilizing prepackaged diagnostic kits comprising at least one probe nucleic acid or antibody reagent described herein, which may be conveniently used, e.g., in clinical settings to diagnose patients exhibiting symptoms or family history of a disease or illness involving a FDRG gene.
  • any cell type or tissue in which FDRG is expressed may be utilized in the prognostic assays described herein.
  • Monitoring the influence of agents (e.g., drugs, compounds) on the expression or activity of FDRG can be applied not only in basic drug screening, but also in clinical trials.
  • agents e.g., drugs, compounds
  • FDRG e.g., activation of a FDRG-dependent signal transduction pathway; modulation of angiogenesis or cellular proliferation; modulation of cell migration or recruitment; or modulation of a hematopoietic response
  • agents e.g., drugs, compounds
  • FDRG-dependent signal transduction pathway e.g., activation of a FDRG-dependent signal transduction pathway; modulation of angiogenesis or cellular proliferation; modulation of cell migration or recruitment; or modulation of a hematopoietic response
  • the effectiveness of an agent determined by a screening assay as described herein to increase FDRG gene expression, protein levels, or upregulate FDRG activity can be monitored in clinical trials of subjects exhibiting decreased FDRG gene expression, protein levels, or downregulated FDRG activity.
  • the effectiveness of an agent determined by a screening assay to decrease FDRG gene expression, protein levels, or downregulate FDRG activity can be monitored in clinical trials of subjects exhibiting increased FDRG gene expression, protein levels, or upregulated FDRG activity.
  • the expression or activity of FDRG and, preferably, other genes that have been implicated in, for example, a proliferative disorder can be used 'as a "read out" or markers of the proliferation of a particular cell.
  • genes including FDRG, that are modulated in cells by treatment with an agent (e.g., compound, drug or small molecule) which modulates FDRG activity (e.g. , identified in a screening assay as described herein) can be identified.
  • an agent e.g., compound, drug or small molecule
  • FDRG activity e.g. , identified in a screening assay as described herein
  • cells can be isolated and RNA prepared and analyzed for the levels of expression of FDRG and other genes implicated in the proliferative disorder, developmental disorder, or hematopoietic disorder, respectively.
  • the levels of gene expression can be quantified by Northern blot analysis or RT-PCR, as described herein, or alternatively by measuring the amount of protein produced, by one of the methods as described herein, or by measurmg the levels of activity of FDRG or other genes.
  • the gene expression pattern can serve as a marker, indicative of the physiological response of the cells to the agent. Accordingly, this response state may be determined before, and at various points during, treatment of the individual with the agent.
  • the present invention provides a method for monitoring the effectiveness of treatment of a subject with an agent (e.g., an agonist, antagonist, peptidomimetic, protein, peptide, nucleic acid, small molecule, or other drug candidate identified by the screening assays described herein) comprising the steps of (i) obtaining a pre-administration sample from a subject prior to administration of the agent; (ii) detecting the level of expression of a FDRG protein, mRNA, or genomic DNA in the preadministration sample; (iii) obtaining one or more post-administration samples from the subject; (iv) detecting the level of expression or activity of the FDRG protein, mRNA, or genomic DNA in the post-administration samples; (v) comparing the level of expression or activity of the FDRG protein, mRNA, or genomic DNA in the pre-administration sample with the FDRG protein, mRNA, or genomic DNA in the post administration sample or samples; and (vi) altering the administration of the agent to the subject accordingly.
  • an agent e.
  • increased administration of the agent may be desirable to increase the expression or activity of FDRG to higher levels than detected, z.e., to increase the effectiveness of the agent.
  • decreased administration of the agent may be desirable to decrease expression or activity of FDRG to lower levels than detected, i.e. to decrease the effectiveness of the agent.
  • FDRG expression or activity may be used as an indicator of the effectiveness of an agent, even in the absence of an observable phenotypic response.
  • the present invention provides for both prophylactic and therapeutic methods of treating a subject at risk of (or susceptible to) a disorder or having a disorder associated with aberrant FDRG expression or activity.
  • treatments may be specifically tailored or modified, based on knowledge obtained from the field of pharmacogenomics.
  • “Pharmacogenomics”, as used herein, refers, to the application of genomics technologies such as gene sequencing, statistical genetics,- and gene expression analysis to drugs in clinical development and on the market. More specifically, the term refers the study of how a patient's genes determine his or her response to a drug (e.g. , a patient's "drug response phenotype", or “drug response genotype”.)
  • a drug response genotype e.g. , a patient's "drug response phenotype", or “drug response genotype”.
  • Pharmacogenomics allows a clinician or physician to target prophylactic or therapeutic treatments to patients who will most benefit from the treatment and to avoid treatment of patients who will experience toxic drug-related side effects.
  • the invention provides a method for preventing in a subject, a disease or condition associated with an aberrant FDRG expression or activity, by administering to the subject an agent which modulates FDRG expression or at least one FDRG activity.
  • Subjects at risk for a disease which is caused or contributed to by aberrant FDRG expression or activity can be identified by, for example, any or a combination of diagnostic or prognostic assays as described herein.
  • Administration of a prophylactic agent can occur prior to the manifestation of symptoms characteristic of the FDRG aberrancy, such that a disease or disorder is prevented or, alternatively, delayed in its progression.
  • a FDRG agonist or FDRG antagonist agent can be used for treating the subject. The appropriate agent can be determined based on screening assays described herein.
  • the modulatory method of the invention involves contacting a cell with an agent that modulates one or more of the activities of FDRG protein activity associated with the cell.
  • An agent that modulates FDRG protein activity can be an agent as described herein, such as a nucleic acid or a protein, a naturally-occurring target molecule of a FDRG protein, a peptide, a FDRG peptidomimetic, or other small molecule.
  • the agent stimulates one or more FDRG protein activity. Examples of such stimulatory agents include active FDRG protein and a nucleic acid molecule encoding FDRG that has been introduced into the cell.
  • the agent inhibits one or more FDRG protein activity.
  • inhibitory agents include antisense FDRG nucleic acid molecules and anti-FDRG antibodies. These modulatory methods can be performed in vitro (e.g., by culturing the cell with the agent) or, alternatively, in vivo (e.g, by administering the agent to a subject).
  • the present invention provides methods of treating an individual afflicted with a disease or disorder characterized by aberrant expression or activity of a FDRG protein or nucleic acid molecule.
  • the method involves administering an agent (e.g., an agent identified by a screening assay described herein), or combination of agents that modulates (e.g., upregulates or downregulates) FDRG expression or activity.
  • an agent e.g., an agent identified by a screening assay described herein
  • the method involves administering a FDRG protein or nucleic acid molecule as therapy to compensate for reduced or aberrant FDRG expression or activity.
  • a preferred embodiment of the present invention involves a method for treatment of a disease or disorder associated with a FDRG protein which includes the step of administering a therapeutically effective amount of an antibody to a FDRG protein to a subject.
  • a therapeutically effective amount of antibody i.e., an effective dosage
  • treatment of a subject with a therapeutically effective amount of an antibody can include a single treatment or, preferably, can include a series of treatments.
  • a subject is treated with antibody in the range of between about 0.1 to 20 mg/kg body weight, one time per week for between about 1 to 10 weeks, preferably between 2 to 8 weeks, more preferably between about 3 to 7 weeks, and even more preferably for about 4, 5, or 6 weeks.
  • the effective dosage of antibody used for treatment may increase or decrease over the course of a particular treatment.
  • Changes in dosage may result from the results of diagnostic assays as described herein.
  • Stimulation of FDRG activity is desirable in situations in which FDRG is abnormally downregulated and/or in which increased FDRG activity is likely to have a beneficial effect.
  • a subject has a disorder characterized by aberrant proliferative disorder (e.g., cancer).
  • a subject has a disorder characterized by an aberrant hematopoietic response.
  • a subject has a disorder characterized by aberrant differentiation or development or aberrant cell migration.
  • FDRG molecules of the present invention as well as agents, or modulators which have a stimulatory or inhibitory effect on FDRG activity (e.g., FDRG gene expression) as identified by a screening assay described herein can be administered to individuals to treat (prophylactically or therapeutically) disorders (e.g, proliferative disorders or developmental disorders) associated with aberrant FDRG activity.
  • pharmacogenomics /. e. , the study of the relationship between an individual's genotype and that individual's response to a foreign compound or drug
  • Differences in metabolism of therapeutics can lead to severe toxicity or therapeutic failure by altering the relation between dose and blood concentration of the pharmacologically active drug.
  • a physician or clinician may consider applying knowledge obtained in relevant pharmacogenomics studies in determining whether to administer a FDRG molecule or FDRG modulator as well as tailoring the dosage and/or therapeutic regimen of treatment with a FDRG molecule or FDRG modulator.
  • Pharmacogenomics deals with clinically significant hereditary variations in the response to drugs due to altered drug disposition and abnormal action in affected persons. See e.g., Eichelbaum, M., Clin Exp Pharmacol Physiol, 1996, 23(10-11) :983- 985 and Linder, M.W., Clin Chem, 1997, 43(2):254-266.
  • two types of pharmacogenetic conditions can be differentiated. Genetic conditions transmitted as a single factor altering the way drugs act on the body (altered drug action) or genetic conditions transmitted as single factors altering the way the body acts on drugs (altered drug metabolism). These pharmacogenetic conditions can occur either as rare genetic defects or as naturally-occurring polymorphisms.
  • glucose-6-phosphate dehydrogenase (G6PD) deficiency is a common inherited enzymopathy in which the main clinical complication is haemolysis after ingestion of oxidant drugs (anti-malarials, sulfonamides, analgesics, nitrofurans) and consumption of fava beans.
  • oxidant drugs anti-malarials, sulfonamides, analgesics, nitrofurans
  • a genome-wide association relies primarily on a high-resolution map of the human genome consisting of already known gene-related markers (e.g., a "bi- allelic” gene marker map which consists of 60,000-100,000 polymorphic or variable sites on the human genome, each of which has two variants.)
  • gene-related markers e.g., a "bi- allelic” gene marker map which consists of 60,000-100,000 polymorphic or variable sites on the human genome, each of which has two variants.
  • Such a high-resolution genetic map can be compared to a map of the genome of each of a statistically significant number of patients taking part in a Phase II/III drug trial to identify markers associated with a particular observed drug response or side effect.
  • such a high resolution map can be generated from a combination of some ten-million known single nucleotide polymorphisms (SNPs) in the human genome.
  • SNPs single nucleotide polymorphisms
  • a "SNP" is a common alteration that occurs in a single nucleotide base in a stretch of DNA. For example, a SNP may occur once per every 1000 bases of DNA.
  • a SNP may be involved in a disease process, however, the vast majority may not be disease- associated.
  • individuals Given a genetic map based on the occurrence of such SNPs, individuals can be grouped into genetic categories depending on a particular pattern of SNPs in their individual genome. In such a manner, treatment regimens can be tailored to groups of genetically similar individuals, taking into account traits that may be common among such genetically similar individuals.
  • a method termed the "candidate gene approach” can be utilized to identify genes that predict drug response.
  • a gene that encodes a drugs target e.g., a FDRG protein or FDRG receptor of the present invention
  • all common variants of that gene can be. fairl easily. identified in the population and it can be determined if having one version of the gene versus another is associated with a particular drug response.
  • the activity of drug metabolizing enzymes is a major determinant of both the intensity and duration of drug action.
  • a method termed the "gene expression profiling" can be utilized to identify genes that predict drag response.
  • a drug e.g., a FDRG molecule or FDRG modulator of the present invention
  • a drug e.g., a FDRG molecule or FDRG modulator of the present invention
  • Information generated from more than one of the above pharmacogenomics approaches can be used to determine appropriate dosage and treatment regimens for prophylactic or therapeutic treatment an individual. This knowledge, when applied to dosing or drug selection, can avoid adverse reactions or therapeutic failure and thus enhance therapeutic or prophylactic efficiency when treating a subject with a FDRG molecule or FDRG modulator, such as a modulator identified by one of the exemplary screening assays described herein.
  • a human FDRG cDNA was isolated from a human aortic endothelial cDNA library.
  • To construct the library three micrograms of poly A + RNA were isolated from human aortic endothelial cells, reverse transcribed, and used to synthesize a cDNA library using the Superscript cDNA Synthesis kitTM (Gibco BRL; Gaithersburg, MD).
  • Complementary DNA was directionally cloned into the expression plasmid pMET7 using the Sail and NotI sites in the polylinker to construct a plasmid library.
  • Transformants were picked and amplified for single-pass sequencing. Additionally, human aortic endothelial cDNA was ligated into the Sall/NotI sites of the ZIPLOXTM vector (Gibco BRL) for construction of a lambda phage cDNA library.
  • a partial cDNA clone encoding FDRG was identified from the above-described cDNA library using the following method. First, each sequence was checked to determine if it was a bacterial, ribosomal, or mitochondrial contaminant. Such sequences were excluded from the subsequent analysis. Second, sequence artifacts, such as vector and repetitive elements, were masked and/or removed from each sequence.
  • the original first pass sequence of the partial cDNA clone showed homology to angiopoietin 2 using the BLASTXTM program. Additional screening of the phage library led to the isolation of a full length clone for human FDRG.
  • the nucleotide sequence and predicted amino acid sequence are shown in Figure 1 (corresponding to SEQ ID NO:l and SEQ ID NO:2, respectively.)
  • the FDRG protein (corresponding to amino acids 1-406 of the predicted amino acid sequence, SEQ ID NO:2) shows 31.0% identity to the human ficolin and 29.0% identity to human angiopoietin 2 (see Figure 3).
  • Percent identity was calculated using the Gap program from GCG (Wisconsin Genetics Computer Group) which incorporates the Needleman- Wunsch alignment algorithm, Needleman and Wunsch (1970) J. Mol Biol. 48:444-453, using a gap weight of 12 and a length weight of 4.
  • This human FDRG protein contains a C-terminal fibrinogen-like domain (corresponding to amino acids 186-399 of the predicted amino acid sequence, SEQ ID NO:2 and amino acids 161-376 of SEQ ID NO:5) and a signal sequence (corresponding to amino acids 1-25 of the predicted amino acid sequence, SEQ ID NO:2) which is cleaved to form a mature FDRG protein (corresponding to amino acids 1-381 of SEQ ID NO:5).
  • FDRG The expression of FDRG was analyzed using Northern blot hybridization.
  • human FDRG the entire FDRG insert was isolated from the plasmid following Sall/NotI digestion and used as a probe.
  • the probe DNA was radioactively labeled with 32 P-dCTP using the Prime-It kitTM (Stratagene, La Jolla, CA) according to the instructions of the supplier.
  • Filters containing human mRNA (MTNI and MTNII from Clontech, Palo Alto, CA; ) were probed in ExpressHybTM hybridization solution (Clontech) and washed at high stringency according to manufacturer's recommendations.
  • FDRG transcript An approximately 2.0 kb FDRG transcript was observed at variable levels in all tissues ' examined (spleen, thymus, prostate, testes, ovary, small intestine, colon, heart, brain, placenta, lung, liver, skeletal muscle, kidney and pancreas) with the sole exception of peripheral blood leukocytes. The highest levels of FDRG expression were observed in the placenta.
  • This Example describes the use of cell supernatant containing AP-hFDRG to screen tissue sections of mouse embryos and of whole mice for FDRG binding sites. Screening of tissue section with supernatant containing alkaline phosphatase (AP) fusion protein was done as described by Cheng and Flanagan (1994) Cell 79:157- 168. Briefly, fresh frozen sections (8 ⁇ m) of mouse embryos (day 14.5 of prenatal development, E14.5) and of whole mice (postnatal day 1.5, PI.5) were prepared and rinsed in HBHA (Hank's balanced salt solution supplemented with 20 mM Hepes, pH 7, 0.05% BSA and 0.1% sodium azide).
  • HBHA Hort alkaline phosphatase
  • tissue sections were incubated for 1 h at room temperature with supernatant containing AP-hFDRG (alkaline phosphatase fused to the N-terminus of human FDRG, respectively) or AP at a concentration of 5nM. After the incubation, tissue sections were washed six times in HBHA, fixed in a solution containing 60% acetone, 3%> formaldehyde and 20 mM Hepes, pH 7.5, washed three times in HBS (20 mM Hepes, pH 7.5, 150 mM NaCl) and heated for 30 min at 65°C to inactivate endogenous alkaline phosphatase activity.
  • AP-hFDRG alkaline phosphatase fused to the N-terminus of human FDRG, respectively
  • Bound AP fusion protein was detected by developing sections in BCIP/NBT substrate solution (100 mM Tris- HCl, pH 9.5, 100 mM NaCl, 5 mM MgCl, 0.17 mg/ml BCIP and 0.33 mg/ml NBT).
  • a murine FDRG cDNA (also referred to herein as "BK89” or "PPAR Gamma Angiopoietin-Related” or “PGAR”) was cloned by a PCR-based subractive hybridization method.
  • the subtractive cloning strategy was designed to take advantage of the availability of cellular model systems and the specificity provided by the synthetic PPAR ⁇ ligands.
  • fibroblastic cells that ectopically express PPAR ⁇ display a basal level of spontaneous adipose conversion, perhaps reflecting a low but significant level of ligand(s) produced endogenously or present in the media
  • two NIH3T3 cell lines were compared, one infected with a retro virus containing an empty vector (e.g., an empty pBABE vector) and the other carrying pBABE-PPAR ⁇ (e.g., expressing PPAR ⁇ ).
  • BOSC23 cells were transiently transfected with pBabe-derived expression vectors and the resulting supernatants containing recombinant virus were transferred to the NIH3T3 fibroblasts, which were subsequently replated and selected in puromycin.
  • the two cell lines were treated with 10 ⁇ g/ml pioglitazone (Upjohn), a PPAR ⁇ ligand, for a period of three hours, and PolyA+ RNA was purified from the cells.
  • the double stranded cDNA resulting from reverse transcription was then digested and used for multiple rounds of subtractive hybridization and PCR amplification according to a PCR-SelectTM DNA subtraction protocol (Clonetech).
  • the subtracted library was then screened by slot blot analysis for differentially regulated genes, and candidates were confirmed by northern- blotting.
  • the enriched cDNAs were cloned into pCR2.1 vector (Invitrogen) and screened by slot blot analysis for differentially regulated genes. Plasmid DNA from three hundred random clones were spotted onto nylon membranes using a vacuum manifold apparatus and hybridized
  • the full-length clone of murine FDRG was obtained from a 3T3-F442A adipocyte ⁇ ZAPII cDNA library.
  • the library screening, subcloning, and sequence analysis were done as described (Ausubel et al. (1991) Current Protocols in Molecular Biology, New York, John Wiley & Sons, Inc.).
  • An open reading frame encoding 410 amino acid residues was identified predicting a 45kDa protein. Hydrophobic sequences are present in the N-terminal regions of murine FDRG, consistent with secretory signal peptides.
  • FDRG may form multimeric structures or other higher order structures (Procopio et al (1999) J. Biol. Chem. 274:30196-30201).
  • the murine FDRG protein also contains three potential N-glycosylation sites, and four cysteines that may be available for intramolecular disulfide bonding. These cysteine residues are conserved not only between human and mouse FDRG, but are also conserved in angiopoietin-2 and ficolin, as shown in Figure 3A-B. Human and mouse FDRG are -75% identical at the amino acid level ( Figure 7).
  • Example 5 Secretion of Murine FDRG From COS7 Cells
  • Vectors encoding untagged and tagged murine FDRG were constructed as follows. Briefly, forward and reverse primers were synthesized and used to amplify the full-length open reading frame of FDRG from pBluescript SK(+/-) by PCR. 5' primers incorporate the native 5' untranslated region upstream of the initiator methionine and 3' primers include the nucleotide sequence encoding the YPYDVPDYA (hemagglutinin, HA) epitope (SEQ ID NO:24) followed by a termination codon. For untagged FDRG, the following primers were used:
  • 5' primer 5' AATTAACCCTCACTAAAGGG 3' (SEQ ID NO:18) 3' primer: ACGCGTCGACTAATACGACTCACTATAGGGCG (SEQ ID NO: 19)
  • 5' primer 5 ' AATTAACCCTCACTAAAGGG 3' (SEQ ID NO: 18)
  • HA-tagged murine FDRG in pcDNA3 , Invitrogen was expressed in COS7 cells using transient transfection and detected the protein in the conditioned media by immunoblotting.
  • COS7 cells were grown to 80% confluence in 10% Cosmic calf serum/DMEM and were transiently transfected with pcDNA or pcDNA-PGAR-HA using SuperfectTM (Qiagen).
  • conditioned medium was collected 48 hr post transfection and 0.22 ⁇ filtered To enhance the visibility of the signal, the conditioned media was concentrated ten-fold before loading by centrifugation in a lOkDa MW cutoff spin column.
  • a human FDRG flag epitope-tagged protein (huFDRG:flag) vector was constructed by PCR followed by ligation into an expression vector, pMET stop.
  • the full-length open-reading frame was PCR amplified using a 5' primer incorporating a Kozak sequence upstream of and including the initiator methionine and a 3' primer including the nucleotide sequence encoding the DYKDDDDK flag epitope (SEQ ID NO:21) followed by a termination codon.
  • the primer sequences are shown below: 5' primer: 5' TTTTTCAATTGACCGCCATGAGCGGTGCTCCGACG 3' (SEQ ID NO:22)
  • sequenced DNA construct was transiently transfected into HEK 293T cells in 150 mm plates using Lipofectamine (GIBCO/BRL) according to the manufacturer's protocol. Seventy-two hours post-transfection, the serum-free conditioned medium (OptiMEM, Gibco/BRL) was harvested and spun.
  • GIBCO/BRL Lipofectamine
  • OptiMEM serum-free conditioned medium
  • Conditioned medium was electroblotted onto a PVDF membrane (Novex) after separation by SDS-PAGE on 4-20% gradient gels and probed with an M2 anti-flag polyclonal antibody (1 :500, Sigma) followed by horseradish peroxidase (HRP) conjugated sheep anti-mouse antibody (1 :5000, Amersham), developed using chemiluminescent reagents (Renaissance, Dupont), and exposed to autoradiography film (Biomax MR2 film, Kodak). Flag immunoreactivity, appeared as a major band that migrated at an apparent molecular weight of 42 kDa as determined by MultiMark molecular weight markers (Novex) by SDS-PAGE.
  • M2 anti-flag polyclonal antibody 1 :500, Sigma
  • HRP horseradish peroxidase conjugated sheep anti-mouse antibody
  • Biomax MR2 film Kodak
  • a murine HA-tagged FDRG expression construct was made as described in Example 5.
  • the DNA construct was sequenced and then transiently transfected into HEK 293T cells in 150 mm plates using Lipofectamine (GIBCO/BRL) according to the manufacturer's protocol. Seventy-two hours post-transfection, the serum-free conditioned medium (OptiMEM, Gibco/BRL) was harvested and spun.
  • Conditioned medium was electroblotted onto PVDF (Novex) after separation by SDS- PAGE on 4-20% gradient gels and probed with an anti-HA monoclonal antibody, HA.l 1 (1:500, Babco) followed by HRP conjugated sheep anti-mouse antibody (1:5000, Amersham), developed using chemiluminescent reagents (Renaissance, Dupont), and exposed to autoradiography film (Biomax MR2 film, Kodak). HA immunoreactivity appeared as a major band that migrated at 60 kDa as determined by MultiMark markers (Novex) by SDS-PAGE. A second fainter band was seen at 42 kDa. Mock Transfected Supernatant
  • a mock supernatant was prepared by transfecting 293T cells with a pMET stop vector containing no insert. Seventy -two hours post-transfection, the serum-free conditioned medium (OptiMEM, Gibco/BRL) was harvested and spun. Conditioned media was electroblotted, developed, and exposed as described above. No specific bands were detected on either anti-flag or anti-HA blots.
  • Mouse genomic clones were isolated by screening a mouse 129SV BAC library (Research Genetics) by PCR.
  • the primers used for screening were as follows: forward primer 5'-CTCTTAGCCTCCTCACTGGAG-3' (SEQ ID NO:30), reverse primer 5'- CACAGTTAGCACCTGTGCATC-3' (SEQ ID NO:31).
  • Amplification conditions were initial denaturation at 95°C for 2 min, 35 cycles of 95°C for 30 s, 57°C for 30 s, and 72°C for 30 s, followed by a final extension at 72°C for 10 min.
  • the positive clone address was 313H16.
  • the PGAR BAC clone was purified by DNA Megaprep Kit (Qiagen) and sequenced with PGAR-specific primers.
  • Figure 8 The genomic sequence of murine FDRG is set forth in Figure 8 ( SEQ ID NO:27).
  • Figure ID depicts schematically the genomic FDRG sequence. Exons are denoted by black boxes and introns by a solid line.
  • the mouse FDRG gene spans approximately 6 kb.
  • the coding region is contained in seven exons, the last four of which encode the fibrinogen-like domain.
  • Example 8 Genetic Mapping of FDRG
  • the PGAR gene was localized to human chromosome 19 using the GENEBRIDGE4 Human/Hamster Radiation Hybrid Panel and the MapManagerTM software.
  • the human mapping primers used for PCR amplification were forward primer 5 ' -GATCGAGGCTGCAGGATATGC-3 ' (SEQ ID NO:32) and reverse primer 5 ' - GTCAGTCAATGTGACTGAGTCC-3' (SEQ ID NO:33).
  • PCRs were performed with an annealing temperature of 52°C and extension times of 50 s at 72°C for 35 cycles, with a final extension of 5 min on an MJ Research Peltier PCT-225 Thermal Cycler. Amplification products were run on a 2% agarose gel, stained postelectrophoresis with SYBR Gold and scanned on a Molecular Dynamics Fluorimager 595. PCRs were also performed with mouse primers described above.
  • the human PGAR gene was localized to chromosome 19pl3.3, 7.8 cR distal of marker AFMA135XB9 and 2.4 cR proximal of marker RP_S28_1. This region is close to ATHS (atherosclerosis susceptibility) and ML4 (sialolipidosis) loci and syntenic to mouse chromosome 10.
  • a synthetic peptide corresponding to the C-terminus of human FDRG was prepared with the following sequence: KTWRGRYYPLQATTMLIQPMAA (SEQ ID NO:25). This was conjugated to KLH (keyhole limpet hemocyanin) at the N-terminal lysine and injected into two rabbits for the production of polyclonal antiserum using standard immunization protocols (e.g., Harlow and Lane, 1987).
  • KLH keyhole limpet hemocyanin
  • a synthetic peptide corresponding to the N-terminus of human FDRG was prepared with the following sequence: PVQSKSPRFASWDEMN (SEQ ID NO:26). This was synthesized with a MAP core (Research Genetics, Rockville MD) at the C- terminal asparagine. It was injected into two rabbits for the production of polyclonal antiserum using standard immunization protocols (e.g., Harlow and Lane, 1987).
  • Antiserum samples were harvested 10 weeks after the initial immunization. Immunoreactivity was tested by ELISA against the immunizing peptide and were positive as compared to pre-immune serum bleeds. Replicate samples of recombinant human FDRG:flag and mouse FDRG:HA protein supernatants and mock transfected negative control supernatants prepared as described above were run on SDS-PAGE and electroblotted onto PVDF membrane (Millipore). 1.T000 dilutions of all four rabbit antisera were used on replicate blots as primary antiserum followed by anti-rabbit HRP conjugated secondary antibodies. Blots were developed using chemiluminescent reagents (Renaissance, Dupont), and exposed to autoradiography film (Biomax MR2 film, Kodak).
  • Immunospecificity of the rabbit antisera were tested by standard Western blot methods. Antisera from the two rabbits immunized with the C-terminal peptide labeled a band in lanes containing human FDRG flag tagged. at the C-terminus that was also immunoreactive with anti-flag M2 antibodies in replicate blots. The approximate molecular weight of this band was 40 (+/-5) kDa as determined using MultiMark standards (Novex). This band was not seen in lanes containing supernatant from mock or mouse FDRG HA transfected cells.
  • Antisera from rabbits immunized with the N-terminal peptide did not show any specific bands in lanes containing either human or mouse FDRG protein when compared to lanes containing mock transfected samples, indicating that by Western blot analysis these antibodies do not interact with FDRG protein.
  • the tissue distribution of FDRG mRNA is highly adipose tissue-selective, with at least 10-20 fold higher expression in white and brown fat over other tissues examined. Low levels of expression were detectable in other tissues (e.g., liver, kidney) and is believed to be due to fat contamination.
  • Example 11 In situ Hybridization of Murine Tissues
  • NIH3T3 fibroblasts stably expressing PPAR ⁇ were treated with 10 ⁇ g/ml pioglitazone for 0, 2, and 4 hours.
  • Northern blot analysis performed on the cellular RNA shows that FDRG mRNA is only barely detectable in untreated cells but undergoes at least a 10-fold increase within two hours after pioglitazone administration.
  • Inhibition of protein synthesis by pre-treatment with 5 ⁇ g/ml cycloheximide does not block this induction. Cycloheximide by itself causes a rise in FDRG mRNA, a phenomenon often associated with immediate early genes and generally attributed to enhanced mRNA stability.
  • 3T3-L1 preadipocyte culture model of adipogenesis the expression of FDRG was examined at various time points during hormone-induced differentiation. Briefly, 3T3-L1 preadipocytes were cultured to confluence and induced to differentiate using established protocols, ie. tliree days of dexamethasone/isobutylmethylxanthine/ insulin treatment followed by insulin treatment. Northern analysis was performed on the total RNA isolated 3, 6, 9, and 12 days after induction (10 ⁇ g/lane). FDRG levels were found to increase dramatically in early differentiation, preceding well-known markers such as lipoprotein lipase, while lagging slightly behind PPAR ⁇ . The latter observation is compatible with FDRG being a target of PPAR ⁇ .
  • Example 13 In vivo Regulation of murine FDRG in Zucker Diabetic Fatty Rats
  • This experiment describes analysis of FDRG mRNA levels in rats following chronic troglitazone treatment to determine if FDRG expresion is regulated by PPAR ⁇ in vivo.
  • Male Zucker diabetic fatty (fa/fa) rats were treated with 6 mg/kg/day (1.2%w/v) troglitazone or placebo admixed with food starting at 6 weeks of age and continuing until 26 weeks.
  • untreated littermates develop severe hyperglycemia and failure of the pancreatic ⁇ -cell function, while the treated animals remain normoglycemic.
  • Northern blots were performed on RNA isolated from white adipose tissue of treated and untreated animals, four from each group, after 4 and 20 weeks of treatment.
  • FDRG expression in vivo was observed to be consistently upregulated 3-5 fold in the treated animals compared to the controls. This was true even when normalized to aP2, a fat cell marker. Glut4 mRNA was also found to be elevated, in agreement with published reports by other groups. Ribosomal-associated 36B4 served as a loading control.
  • FDRG expression was examined in white and brown fat tissues from 9 week old male obese (ob/ob) and diabetic (db/db) mice.
  • Northern analysis showed uniform 3-4 fold elevation of FDRG mRNA in ob/ob and db/db animals compared to their respective congenic lean controls, both in white and brown fat. This may reflect a correlation of increased FDRG expression with obese states in general, raising the possibility that FDRG may contribute to some of the pathophysiological features of such states.
  • FDRG mRNA levels may be regulated directly or indirectly by the genetic defects specific for these two models, i.e. leptin and the leptin receptor.
  • mice receiving intraperitoneal administration of leptin, with consequent decrease in dietary intake were compared to that in mice diet restricted to match the amount of food intake by the former group.
  • 10 week old lean or ob/ob mice were divided into three groups. The first group was the control, intraperitoneally injected with 1.5 ml PBS twice daily. The second group was injected with 12.5 mg/kg leptin in PBS twice daily, with consequent decrease in dietary intake. The third group, the pair-fed group, was diet restricted to match the amount of food intake by the leptin-injected group, and was also injected with PBS. The animals were sacrified at the end of one week.
  • FDRG expression in brown fat was seen to go up substantially with restrictions of caloric intake, consistent with the findings in the first study, but this rise is not seen in leptin treated animals. That may reflect a fundamental difference in leptin-induced dietary restriction versus externally imposed restriction, or may be consistent with a further downstream effect, e.g., leptin- mediated suppression of FDRG upregulation that would ordinarily result from reduced food intake.
  • RNA isolated from human placenta, heart, kidney, liver, and fat tissue samples showed high expression in white fat, in agreement with the murine FDRG tissue expression data, and in placenta.
  • Placental expression is of interest because it is a tissue known to undergo extensive vascular remodelling in the adult (e.g., in its development during pregnancy) and involved in transport of metabolic substrates for the fetus.
  • Another fat-derived secreted protein with important metabolic and endocrine functions, leptin is also produced in abundant quantities in placenta.
  • Example 17 Expression of Recombinant FDRG Protein in Bacterial Cells
  • FDRG can be expressed as a recombinant glutathione-S-transferase (GST) fusion polypeptide in E. coli and the fusion polypeptide can be isolated and characterized. Specifically, FDRG is fused to GST and this fusion polypeptide is expressed in E. coli, e.g., strain PEB199. Expression of the GST-FDRG fusion protein in PEB199 is induced with IPTG. The recombinant fusion polypeptide is purified from crude bacterial lysates of the induced PEB199 strain by affinity chromatography on glutathione beads. Using poly aery lamide gel electrophoretic analysis of the polypeptide purified from the bacterial lysates, the molecular weight of the resultant fusion polypeptide is determined.
  • GST glutathione-S-transferase
  • the pcDNA/Amp vector by Invitrogen Corporation (San Diego, CA) is used.
  • This vector contains an SV40 origin of replication, an ampicillin resistance gene, an E. coli replication origin, a CMV promoter followed by a polylinker region, and an SV40 intron and polyadenylation site.
  • a DNA fragment encoding the entire FDRG protein and a HA tag (Wilson et al. (1984) Cell 37:767) fused in-frame to its 3' end of the fragment is cloned into the polylinker region of the vector, thereby placing the expression of the recombinant protein under the control of the CMV promoter.
  • the FDRG DNA sequence is amplified by PCR using two primers.
  • the 5' primer contains the restriction site of interest followed by approximately twenty nucleotides of the FDRG coding sequence starting from the initiation codon; the 3' end sequence contains complementary sequences to the other restriction site of interest, a translation stop codon, the HA tag and the last 20 nucleotides of the FDRG coding sequence.
  • the PCR amplified fragment and the pCDNA/Amp vector are digested with the appropriate restriction enzymes and the vector is dephosphorylated using the CIAP enzyme (New England Biolabs, Beverly, MA).
  • the two restriction sites chosen are different so that the FDRG gene is inserted in the correct orientation.
  • the ligation mixture is transformed into E. coli cells (strains HB101, DH5a, SURE, available from Stratagene Cloning Systems, La Jolla, CA, can be used), the transformed culture is plated on ampicillin media plates, and resistant colonies are selected. Plasmid DNA is isolated from transformants and examined by restriction analysis for the presence of the correct fragment.
  • COS cells are subsequently transfected with the FDRG-pcDNA/Amp plasmid DNA using the calcium phosphate or calcium chloride co-precipitation methods, DEAE- dextran-mediated transfection, lipofection, or electroporation.
  • Other suitable methods for transfecting host cells can be found in Sambrook, J., Fritsh, E. F., and Maniatis, T. Molecular Cloning: A Laboratory Manual 2nd, ed., Cold Spring Harbor Laboratory, Cold Spring Harbor Laboratory Press,' Cold Spring Harbor, NY, 1989.
  • the expression of the FDRG protein is detected by radiolabelling ( 5 S-methionine or 35 S-cysteine available from NEN, Boston, MA, can be used) and immunoprecipitation (Harlow, E. and Lane, D. Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, 1988) using an HA specific monoclonal antibody. Briefly, the cells are labeled for 8 hours with 35 S-methionine (or 35 S-cysteine). The culture media are then collected and the cells are lysed using detergents (RIPA buffer, 150 mM NaCl, 1% NP-40, 0.1% SDS, 0.5% DOC, 50 mM Tris, pH 7.5). Both the cell lysate and the culture media are precipitated with an HA specific monoclonal antibody. Precipitated proteins are then analyzed by SDS-PAGE.
  • DNA containing the FDRG coding sequence is cloned directly into the polylinker of the pCDNA/Amp vector using the appropriate restriction sites.
  • the resulting plasmid is transfected into COS cells in the manner described above, and the expression of the FDRG protein is detected by radiolabelling and immunoprecipitation using a FDRG specific monoclonal antibody
  • FDRG The entire open reading frame of FDRG can be subcloned into the retroviral vector MSCVneo, described in Hawley et al. (1994) Gene Therapy 1:136-138.
  • Cells (293Ebna, Invitrogen) are then transiently transfected with the FDRG construct and with constructs containing viral regulatory elements, to produce high titre retrovirus containing the FDRG gene.
  • the virus is then used to transfect mice. These mice are then tested for any gross pathology and for changes in biological response, e.g., cell migration, using standard assays.

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Abstract

Cette invention concerne de nouveaux polypeptides, protéines et molécules d'acide nucléique FDRG. Outre des protéines FDRG pleine longueur isolées, l'invention concerne des protéines de fusion FDRG, des peptides antigéniques et des anticorps anti-FDRG isolés. Elle concerne également des molécules d'acide nucléique FDRG, des vecteurs d'expression recombinés contenant une molécule d'acide nucléique selon la présente invention, des cellules hôtes dans lesquelles les vecteurs d'expression ont été introduits et des animaux transgéniques dans lesquels un gène FDRG a été introduit ou fonctionnellement modifié. Des techniques de diagnostic, de criblage et de thérapie faisant appel aux compositions selon la présente invention sont également décrits.
PCT/US2001/011400 2000-04-07 2001-04-06 Nouvelles molecules de proteines et d'acide nucleique fdrg et utilisation desdites molecules WO2001077151A2 (fr)

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US7371384B2 (en) 2004-07-20 2008-05-13 Genentech, Inc. Compositions and methods of using angiopoietin-like 4 protein antibody
US7740846B2 (en) 2004-07-20 2010-06-22 Genentech, Inc. Inhibitors of angiopoietin-like 4 protein, combinations, and their use
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US8604185B2 (en) 2004-07-20 2013-12-10 Genentech, Inc. Inhibitors of angiopoietin-like 4 protein, combinations, and their use
CN107827974A (zh) * 2017-11-10 2018-03-23 中国科学院过程工程研究所 一种人纤维蛋白原的制备方法
WO2020099478A3 (fr) * 2018-11-13 2020-08-13 Lipigon Pharmaceuticals Ab Oligonucléotides d'angptl4 influençant la régulation du métabolisme des acides gras

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WO1999045135A1 (fr) * 1998-03-02 1999-09-10 Millennium Pharmaceuticals, Inc. Nouvelles molecules fdrg de proteines et d'acide nucleique et utilisation desdites molecules
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Cited By (13)

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Publication number Priority date Publication date Assignee Title
US8084200B2 (en) 2002-11-15 2011-12-27 Genentech, Inc. Compositions and methods for the diagnosis and treatment of tumor
US8633155B2 (en) 2004-07-20 2014-01-21 Genentech, Inc. Methods of using angiopoietin-like 4 protein to stimulate proliferation of pre-adipocytes
US7740846B2 (en) 2004-07-20 2010-06-22 Genentech, Inc. Inhibitors of angiopoietin-like 4 protein, combinations, and their use
US7371384B2 (en) 2004-07-20 2008-05-13 Genentech, Inc. Compositions and methods of using angiopoietin-like 4 protein antibody
US8604185B2 (en) 2004-07-20 2013-12-10 Genentech, Inc. Inhibitors of angiopoietin-like 4 protein, combinations, and their use
US7655762B2 (en) 2005-01-07 2010-02-02 Lexicon Pharmaceuticals, Inc. Monoclonal antibodies against ANGPTL4
US8092796B2 (en) 2005-01-07 2012-01-10 Lexicon Pharmaceuticals, Inc. Monoclonal antibodies against ANGPTL4
EA016185B1 (ru) * 2005-01-07 2012-03-30 Лексикон Фармасьютикалз, Инк. Моноклональное антитело или его фрагмент к подобному ангиопоэтину белку 4 (angptl4) и их применение
US8591891B2 (en) 2005-01-07 2013-11-26 Lexicon Pharmaceuticals, Inc. Monoclonal antibodies against ANGPTL4
WO2006074228A1 (fr) * 2005-01-07 2006-07-13 Lexicon Pharmaceuticals, Inc. Anticorps monoclonaux diriges contre la proteine de type angiopoietine 4 (angptl4)
CN107827974A (zh) * 2017-11-10 2018-03-23 中国科学院过程工程研究所 一种人纤维蛋白原的制备方法
WO2020099478A3 (fr) * 2018-11-13 2020-08-13 Lipigon Pharmaceuticals Ab Oligonucléotides d'angptl4 influençant la régulation du métabolisme des acides gras
US11781139B2 (en) 2018-11-13 2023-10-10 Lipigon Pharmaceuticals Ab ANGPTL4 oligonucleotides influencing the regulation of the fatty acid metabolism

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