EP0939814A1 - Proteines "fringe" et signalisation de notch - Google Patents
Proteines "fringe" et signalisation de notchInfo
- Publication number
- EP0939814A1 EP0939814A1 EP97944671A EP97944671A EP0939814A1 EP 0939814 A1 EP0939814 A1 EP 0939814A1 EP 97944671 A EP97944671 A EP 97944671A EP 97944671 A EP97944671 A EP 97944671A EP 0939814 A1 EP0939814 A1 EP 0939814A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fringe
- protein
- sequence
- mammalian
- notch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K67/00—Rearing or breeding animals, not otherwise provided for; New breeds of animals
- A01K67/033—Rearing or breeding invertebrates; New breeds of invertebrates
- A01K67/0333—Genetically modified invertebrates, e.g. transgenic, polyploid
- A01K67/0337—Genetically modified Arthropods
- A01K67/0339—Genetically modified insects, e.g. Drosophila melanogaster, medfly
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
- C07K14/47—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/1048—Glycosyltransferases (2.4)
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K2217/00—Genetically modified animals
- A01K2217/05—Animals comprising random inserted nucleic acids (transgenic)
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K2217/00—Genetically modified animals
- A01K2217/07—Animals genetically altered by homologous recombination
- A01K2217/075—Animals genetically altered by homologous recombination inducing loss of function, i.e. knock out
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K48/00—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy
Definitions
- This invention relates to control of the interaction between Notch receptors and their ligands.
- the wing imaginal disc is divided into anterior/posterior (A/P) compartments and dorso/ventral (D/V) compartments, which are specified during embryogenesis and second larval instar, respectively.
- the posterior compartment cells express the secreted protein Hedgehog (HH) but do not express the Zn- finger protein Cubitus interruptus (CI) which is required for cells to respond to HH (Dominguez et al . , 1996) .
- the anterior compartment cells express Ci but no HH. Because the posterior cells express HH but cannot respond to it, whereas the Ci -expressing anterior cells can respond to HH but do not make it, HH response only occurs at the boundary between posterior and anterior compartments (Dominguez et al .
- the Notch signalling system is activated by the juxtaposition of the dorsal and ventral compartments (de Celis et al . , 1996; Diaz-Benjumea and Cohen, 1993). Establishment of the dorso/ventral compartment boundary is also initiated through the restricted expression of a transcription factor.
- Dorsal cells express the LIM domain/homeodomain-containing protein, Apterous
- Notch ligands are also expressed in the wing imaginal disc. Serrate is most strongly expressed in dorsal cells (Kim et al . , 1995), and Delta in ventral cells (Doherty et al . , 1996) . The juxtaposition of dorsal cells expressing Fringe and Serrate with ventral cells which express Wingless and Delta results in the localized activation of Notch on either side of the D/V compartment boundary (de Celis et al . , 1996; Irvine and Wieschaus, 1994; Kim et al . , 1995) . The activated Notch receptor then signals the induction of wing margin tissue at this boundary (de Celis et al .
- Fringe regulates ventral cells causes the local activation of Notch with resulting induction of margin tissue and wing outgrowth (Irvine and Wieschaus, 1994; Kim et al . , 1995). Removal of Fringe from dorsal cells has a similar effect (Irvine and Wieschaus, 1994) . Both of these phenomena have implicated Fringe in creating boundaries and in controlling Notch activation (Irvine and Wieschaus, 1994) . The precise mechanism by which Fringe regulates
- Figures 1A and IB show ectopic expression of Manic and Radical Fringe in Drosophila .
- Figure 1A shows panels (A) wild type wing; D) eye from GAL4 ptc fly (similar to wild type) ; (B) and (E) wing and eye from flies crossed to UAS- Manic Fringe and GAL4 driver; (C) and (F) wing and eye from flies crossed to UAS-Radical Fringe and GAL4 drivers.
- B, C, E, F ectopic expression with GAL4 pt driver.
- H, I ectopic expression with GAL 4 C5 driver.
- Figure IB shows panels (G) , (H) wings from flies crossed to VAS-Manic Fringe and GAL4 drivers (ectopic expression with GAL4 c96 and GAL4 C5 drivers respectively.
- Figure 2 shows wings ectopically expressing Radical Fringe with GAL4 ptc driver in different genetic backgrounds
- A GAL4 ptc /+
- wing(B, C) fng 52 /+ and GAL4 ptc /+
- D,H Dl x /+ and GAL4 pc /+
- UAS-Radical Fringe/!
- Figure 4 shows Northern blot analysis of Fringe gene expression in mice. Probe detects RNA from adult mouse tissues hybridized with each of the three mouse Fringe genes .
- Figures 5A and 5B show expression of mouse Fringe genes in embryonic and selected adult tissues.
- Figure 5A shows panels (A and B) Whole mount in si tu hybridization with Lunatic Fringe antisense riboprobes in E8.5 and E9.5 day embryos respectively; (C and E) Dark field section in si tu hybridization with Lunatic Fringe antisense riboprobes in Ell.5 and E12.5 day embryos respectively;
- Figure 5B shows panels (G) Bright field of section in si tu hybridization with Lunatic Fringe antisense riboprobes in E13.5 day embryo with close up of grains on S- shaped bodies in kidney; (H and J) Dark field section in si tu hybridization with Lunatic Fringe antisense riboprobes in adult thymus and spleen respectively (I) Bright field of spleen section shown in panel J (K and L) Dark field and bright field of section in si tu hybridization with Manic Fringe antisense riboprobes in adult spleen, with close up of grains in megakaryocytes shown in panel L .
- Figure 6 shows Fringe gene switch in differentiation in the mouse.
- A, B, C Dark field section in si tu hybridization with antisense probes to Lunatic (A) , Manic (B) and Radical (C) Fringe genes in E10.5 mouse embryo neural tubes . vz is the ventricular zone and mz is the marginal zone of the neural tube.
- D, E, F Dark field section in situ hybridization with antisense probes to Lunatic (D) , Manic (E) and Radical (F) Fringe genes in adult tongue, be is the basal epithelium and sbe is the suprabasal epithelium.
- Figure 7 shows expression of mouse. Notch ligands and Lunatic Fringe during somitogenesis and neural tube patterning.
- A, B, C Whole mount in si tu hybridization with antisense probes to Del tal
- A Luna tic Fringe
- B Luna tic Fringe
- Figure 8 shows a schematic diagram of the proposed model for Fringe proteins as regulators of Notch specificity and sensitivity for its ligands.
- Figure 9 shows a schematic diagram for the model of
- Notch receptors The interaction of Notch receptors with Notch ligands plays an important role in development in mammals and in insects. Activation of a Notch receptor by a Notch ligand initiates signal transduction, the signal being communicated to the cell via the cytosolic domain of the Notch receptor protein.
- Notch ligands which activate the Notch receptor and initiate signal transduction include the DSL group of ligands, for example, Delta protein, Serrate protein and Lag-2 protein.
- the inventors have cloned and characterized three novel mammalian genes which are related to Drosophila Fringe , as described in the Examples herein. These mammalian genes are expressed in tissues which are undergoing Notch-dependent development and differentiation. Experiments in Drosophila with these mammalian fringe genes revealed that the Fringe proteins control or modulate activation of the Notch receptor by Notch ligands.
- the Fringe system of proteins can be used to induce new cell fates at tissue boundaries, to reinforce predetermined tissue boundaries and to block Notch signalling in differentiating cells.
- Mammals have at least four Notch receptors which can interact with Notch ligands (Egan et al . (1997), Current Topics in Microbiology and Immunology, 228 , 273 - 324) .
- the three mammalian Fringe proteins act to promote or inhibit the interaction of Notch receptors with Notch ligands.
- Undifferentiated mammalian cells appear to express Luna tic Fringe but not Mani c Fringe or Radical Fringe . During differentiation, there is a switch over to expression of Manic and Radical and a cessation of expression of Lunatic .
- the present invention demonstrates that the three mammalian Fringe proteins may be used to facilitate or block the Notch signal transduction pathway and Notch- dependent processes by regulating the sensitivity of Notch receptors for their specific ligands.
- this invention provides isolated nucleic acids corresponding to or related to the nucleic acid sequences disclosed herein which encode the murine Fringe proteins, Lunatic Fringe, Radical Fringe and Manic Fringe.
- the invention provides cDNA sequences encoding the murine Lunatic Fringe, Manic
- Fringe and Radical Fringe proteins (Sequence ID NOS: 1, 3 and 5 respectively) comprising the nucleotide sequences of Sequence ID NOS: 2, 4 and 6 respectively.
- Fringe gene sequences useful as probes in PCR primers or for encoding fragments, functional domains or antigenic determinants of Fringe proteins.
- the invention also provides portions of the disclosed nucleic acid sequences comprising about 10 consecutive nucleotides (eg. for use as PCR primers) to nearly the complete disclosed nucleic acid sequences.
- the invention provides isolated nucleic acid sequences comprising sequences corresponding to at least 10, preferably 15 and more preferably at least 20 consecutive nucleotides of the Fringe genes as disclosed or enabled herein or their complements.
- isolated nucleic acids of the invention include any of the above described nucleotide sequences included in a vector.
- this invention provides substantially pure mammalian Fringe proteins, fragments of these proteins and fusion proteins including these proteins and fragments.
- the proteins, fragments and fusion proteins have utility, as described herein, for the preparation of polyclonal and monoclonal antibodies to mammalian Fringe proteins, for the identification of binding partners of the mammalian Fringe proteins and for diagnostic and therapeutic methods, as described herein.
- the present invention provides substantially pure proteins, polypeptides or derivatives of polypeptides which comprise portions of the mammalian Fringe amino acid sequences disclosed or enabled herein and which may vary from about 4 to 5 amino acids (e.g. for use as immunogens) to the complete amino acid sequence of the proteins.
- the invention provides substantially pure proteins or polypeptides comprising sequences corresponding to at least 5, preferably at least 10 and more preferably 50 or 100 consecutive amino acids of the mammalian Fringe proteins disclosed or enabled herein.
- the proteins of the invention may be isolated and purified by any conventional method suitable in relation to the properties revealed by the amino acid sequences of these proteins .
- cell lines may be produced which overexpress the Fringe gene products, allowing purification of the proteins for biochemical characterization, large-scale production, antibody production and patient therapy.
- eukaryotic and prokaryotic expression systems may be generated in which a Fringe gene sequence is introduced into a plasmid or other vector which is then introduced into living cells. Constructs in which the Fringe cDNA sequence containing the entire open reading frame is inserted in the correct orientation into an expression plasmid may be used for protein expression. Alternatively, portions of the sequence may be inserted.
- Prokaryotic and eukaryotic expression systems allow various important functional domains of the protein to be recovered as fusion proteins and used for binding, structural and functional studies and also for the generation of appropriate antibodies.
- Typical expression vectors contain promoters that direct the synthesis of large amounts of mRNA corresponding to the gene.
- Stable long-term vectors may be maintained as freely replicating entities by using regulatory elements of viruses.
- Cell lines may also be produced which have integrated the vector into the genomic DNA and in this manner the gene product is produced on a continuous basis.
- E. coli require the insertion of the sequence into an expression vector, usually a plasmid which contains several elements such as sequences encoding a selectable marker that assures maintenance of the vector in the cell, a controllable transcriptional promoter which upon induction can produce large amounts of mRNA from the cloned gene, translational control sequences and a polylinker to simplify insertion of the gene in the correct orientation within the vector.
- a relatively simple E. coli expression system utilizes the lac promoter and a neighboring lacZ gene which is cut out of the expression vector with restriction enzymes and replaced by the Fringe gene sequence .
- T7 late-promoter expression system In vitro expression of proteins encoded by cloned DNA is also possible using the T7 late-promoter expression system.
- Plasmid vectors containing late promoters and the corresponding RNA polymerases from related bacteriophages such as T3 , T5 and SP6 may also be used for in vitro production of proteins from cloned DNA.
- E. coli can also be used for expression by infection with M13 Phage mGPI- 2.
- E. coli vectors can also be used with phage Lambda regulatory sequences, by fusion protein vectors, by maltose-binding protein fusions, and by glutathione-S- transferase fusion proteins.
- Eukaryotic expression systems permit appropriate post-translational modifications to expressed proteins. This allows for studies of the fringe genes and gene products including determination of proper expression and post-translational modifications for biological activity, identifying regulatory elements in the 5 ' region of the gene and their role in tissue regulation of protein expression. It also permits the production of large amounts of normal proteins for isolation and purification, to test the effectiveness of pharmacological agents or as a component of a signal transduction system to study the function of the normal complete protein, specific portions of the protein, or of naturally occurring polymorphisms and artificially produced mutated proteins.
- Fringe DNA sequences can be altered using procedures such as restriction enzyme digestion, DNA polymerase fill-in, exonuclease deletion, terminal deoxynucleotide transferase extension, ligation of synthetic or cloned DNA sequences and site-directed in vitro mutagenesis, including site-directed sequence alteration using specific oligonucleotides together with PCR.
- the appropriate expression vector containing the selected gene is constructed, it is introduced into an appropriate host cell by transformation techniques including calcium phosphate trans ection, DEAE-dextran transfection, electroporation, microinjection, protoplast fusion and liposome-mediated transfection.
- the host cell which may be transfected with the vector of this invention may be selected from the group consisting of E. Coli, Pseudomonas, Bacillus subtilis, or other bacilli, other bacteria, yeast, fungi, insect (using baculoviral vectors for expression) , mouse or other animal or human tissue cells. Mammalian cells can also be used to express the Fringe proteins using a vaccinia virus expression system.
- Fringe proteins in tissues can be analyzed by reverse transcriptase PCR analysis.
- Antibodies can also be generated for several applications including both immunocytochemistry and immunofluorescence techniques to visualize the proteins directly in cells and tissues in order to establish the cellular location of the proteins.
- the present invention includes effective fragments or analogues of the Fringe proteins described herein. "Effective" fragments or analogues retain the activity of the described Fringe proteins to modulate Notch receptor/Notch ligand interactions.
- analogue extends to any functional and/or chemical equivalent of a mammalian Fringe protein and includes proteins having one or more conservative amino acid substitutions, proteins incorporating unnatural amino acids and proteins having modified side chains.
- side chain modifications contemplated by the present invention include modification of amino groups such as by reductive alkylation by reaction with an aldehyde followed by reduction with NaBH 4 ; amidation with methylacetimidate; acetylation with acetic anhydride; carbamylation of amino groups with cyanate; trinitrobenzylation of amino groups with 2, 4, 6, trinitrobenzene sulfonic acid (TNBS) ; alkylation of amino groups with succinic anhydride and tetrahydrophthalic anhydride; and pyridoxylation of lysine with pyridoxal- 5 ' -phosphate followed by reduction with NaBH 4 .
- amino groups such as by reductive alkylation by reaction with an aldehyde followed by reduction with NaBH 4 ; amidation with methylacetimidate; acetylation with acetic anhydride; carbamylation of amino groups with cyanate; trinitrobenzylation of amino groups with 2, 4, 6, trinitrobenzene sulf
- the guanidino group of arginine residues may be modified by the formation of heterocyclic condensation products with reagents such as 2, 3-butanedione, phenylglyoxal and glyoxal .
- the carboxyl group may be modified by carbodiimide activation via -acylisourea formation followed by subsequent derivatisation, for example, to a corresponding amide.
- Sulfhydryl groups may be modified by methods such as carboxymethylation with iodoacetic acid or iodoacetamide ; performic acid oxidation to cysteic acid; formation of mixed disulphides with other thiol compounds; reaction with maleimide, maleic anhydride or other substituted maleimide; formation of mercurial derivatives using 4- chloromercuribenzoate, 4-chloromercuriphenylsulfonic acid, phenylmercury chloride, 2-chloromercuric-4- nitrophenol and other mercurials; carbamylation with cyanate at alkaline pH.
- Tryptophan residues may be modified by, for example, oxidation with N-bromosuccinimide or alkylation of the indole ring with 2-hydroxy-5-nitrobenzyl bromide or sulphonyl halides.
- Tyrosine residues may be altered by nitration with tetranitromethane to form a 3- nitrotyrosine derivative.
- Modification of the imidazole ring of a histidine residue may be accomplished by alkylation with iodacetic acid derivatives of N-carbethoxylation with diethylpyrocarbonate .
- Examples of incorporating unnatural amino acids and derivatives during peptide synthesis include, but are not limited to, use of norleucine, 4-amino butyric acid, 4- amino-3-hydroxy-5-phenylpentanoic acid, 6-aminohexanoic acid-, t-butylglycine, norvaline, phenylglycine, ornithine, sarcosine, 4-amino-3 -hydroxy- 6 -methylheptanoic acid, 2-thienyl alanine and/or D-isomers or amino acids.
- amino acids are identified by the conventional single letter code
- Group 1 F Y W
- Group 2 V L I
- Group 3 H K R
- Group 4 M S T P A G
- Group 5 D E.
- Fragments or analogues of the mammalian Fringe proteins of the invention may be conveniently screened for their effectiveness by a variety of methods.
- a Drosophila-based assay can be employed.
- the mammalian Manic and Radical Fringe proteins interfere with specific Notch-dependent developmental events (eg. Manic Fringe blocks wing margin formation, and causes small eyes and fusion of ocelli in specific transgenic lines whereas Radical Fringe blocks
- Transgenic Drosophila may be used to screen for Fringe proteins, analogues and fragments which enhance or suppress these phenotypes .
- drugs which enhance or suppress these phenotypes could be identified which would be useful therapeutically in humans to alter Fringe function and Notch signalling.
- a cell culture assay could be used as a screen. It has been reported that differentiation of C2C12 myoblast cells can be blocked in culture by activation of Notch expressed on the cell surface. (Lindsell et al . (1995), Cell, 80, 909-917; Luo et al . , (1997), Mol. Cell. Biol., 17, 6057-6067). This activation can occur as a result of presenting DSL ligands to the C2C12 cells. This is achieved by coculturing cells expressing Notch ligands with the C2C12 cells.
- This assay can be easily adapted to screen for the effect of Fringe proteins, analogues and fragments to regulate the activation of mammalian Notch receptors by their ligands.
- any cell culture system which shows iri vitro differentiation dependent on Notch activation may form the basis of a screening assay.
- fusion proteins containing defined portions or all of the Fringe proteins can be synthesized in bacteria by expression of corresponding DNA sequences in a suitable cloning vehicle. Fusion proteins are commonly used as a source of antigen for producing antibodies.
- Two widely used expression systems for E. coli are glutathione-S- tranferase or maltose binding protein fusions using the pUR series of vectors and trpE fusions using the pATH vectors.
- the protein can then be purified, coupled to a carrier protein if desired, and mixed with Freund's adjuvant (to help stimulate the antigenic response of the animal) and injected into rabbits or other appropriate laboratory animals.
- the protein can be isolated from Fringe protein-expressing cultured cells. Following booster injections at weekly intervals, the rabbits or other laboratory animals are then bled and the sera isolated. The sera can be used directly or purified prior to use by various methods including affinity chromatography employing Protein A-Sepharose, antigen Sepharose or Anti-mouse- Ig-Sepharose . The sera can then be used to probe protein extracts from cells and tissues run on a polyacrylamide gel to identify the Fringe protein. Alternatively, synthetic peptides can be made to the antigenic portions of the proteins and used to inoculate the animals.
- the objective is to choose a region of the protein that is either surface exposed such a hydrophilic region or a region conformationally flexible relative to the rest of the structure, such as a loop region or a region predicted to form a ⁇ -turn.
- the selection process is also limited by constraints imposed by the chemistry of the coupling procedures used to attach peptide to carrier protein.
- a carboxyl-terminal peptide is chosen because they are often more mobile than the rest of the molecule and the peptide can be coupled to a carrier in a straightforward manner using glutaraldehyde .
- the amino-terminal peptide has the disadvantage that it may be modified post- translationally by acetylation or by the removal of a leader sequence. A comparison of the protein amino acid sequence between species can yield important information.
- Synthetic peptides can also be synthesized as immunogens as long as they mimic the native antigen as closely as possible.
- monoclonal anti-Fringe antibodies may also be produced using Fringe protein obtained from cells actively expressing the protein or by isolation from tissues.
- the cell extracts, or recombinant protein extracts, containing the Fringe protein are injected in Freund's adjuvant into mice. After being injected 9 times over a three week period, the mice spleens are removed and resuspended in phosphate buffered saline (PBS) .
- PBS phosphate buffered saline
- the spleen cells serve as a source of lymphocytes, some of which are producing antibody of the appropriate specificity.
- tissue culture wells in the presence of a selective agent such as HAT.
- the wells are then screened by ELISA to identify those containing cells making binding antibody. These are then plated and after a period of growth, these wells are again screened to identify antibody-producing cells.
- Several cloning procedures are carried out until over 90% of the wells contain single clones which are positive for antibody production. From this procedure a stable line of clones which produce the antibody is established.
- the monoclonal antibody can then be purified by affinity chromatography using Protein A Sepharose, ion-exchange chromatography, as well as variants and combinations of these techniques.
- Truncated versions of monoclonal antibodies may also be produced by recombinant techniques in which plasmids are generated which express the desired monoclonal antibody fragment (s) in a suitable host.
- Antibodies specific for mutagenic epitopes can also be generated.
- mammalian proteins, Fringe analogues and fragments thereof and/or peptides of the invention are also useful as antigens in immunoassays including enzyme- linked immunosorbent assays (ELISA) , radioimmunoassays
- ELISA enzyme- linked immunosorbent assays
- this invention provides pharmaceutical compositions for the treatment of mammalian disorders which involve inappropriate Fringe function and/or Notch signalling, comprising a therapeutic amount of a Fringe protein, an analog or an effective derivative thereof in association with a pharmaceutical carrier.
- Administration of a therapeutically active amount of a pharmaceutical composition of the present invention means an amount effective, at dosages and for periods of time necessary to achieve the desired result. This may also vary according to factors such as the disease state, age, sex, and weight of the subject, and the ability of the mammalian Fringe protein to elicit a desired response in the subject. Dosage procedures may be adjusted to provide the optimum therapeutic response. For example, several divided doses may be administered daily or the dose may be proportionally reduced as indicated by the exigencies of the therapeutic situation.
- pharmaceutically acceptable carrier as used herein is meant one or more compatible solid or liquid delivery systems.
- pharmaceutically acceptable carriers are sugars, starches, cellulose and its derivatives, powdered tragacanth, malt, gelatin, collagen, talc, stearic acids, magnesium stearate, calcium sulfate, vegetable oils, polyols, agar, alginic acids, pyrogen-free water, isotonic saline, phosphate buffer, and other suitable non-toxic substances used in pharmaceutical formulations.
- Other excipients such as wetting agents and lubricants, tableting agents, stabilizers, anti-oxidants and preservatives are also contemplated.
- compositions described herein can be prepared by known methods for the preparation of pharmaceutically acceptable compositions which can be administered to subjects, such that an effective quantity of the active substance is combined in a mixture with a pharmaceutically acceptable carrier.
- Suitable carriers and formulations adapted for particular modes of administration are described, for example, in Remington's Pharmaceutical Sciences (Remington's Pharmaceutical Sciences, Mack Publishing Company, Easton, Pa., USA 1985) .
- the compositions include, albeit not exclusively, solutions of the substance in association with one or more pharmaceutically acceptable vehicles or diluents, and contained in buffered solutions with a suitable pH and iso-osmotic with the physiological fluids .
- compositions of the invention may be administered therapeutically by various routes such as by injection or by oral, nasal, buccal , rectal, vaginal, transdermal or ocular routes in a variety of formulations, as is known to those skilled in the art.
- the mammalian Fringe proteins expressed as fusion proteins, can be utilized to identify small peptides that bind to these proteins.
- phage display random peptides (up to 20 amino acids long) are expressed with coat proteins (geneIII or geneVIII) of filamentous phage such that they are expressed on the surface of the phage thus generating a library of phage that express random sequences.
- a library of these random sequences is then selected by incubating the library with the mammalian Fringe protein or fragments thereof and phage that bind to the protein are then eluted either by cleavage of Fringe from the support matrix or by elution using an excess concentration of soluble Fringe protein or fragments.
- the eluted phage are then repropagated and the selection repeated many times to enrich for higher affinity interactions.
- the random peptides can either be completely random or constrained at certain positions through the introduction of specific residues. After several rounds of selection, the final positive phage are sequenced to determine the sequence of the peptide.
- Fringe proteins are immobilised on a suitable solid support. Preparations such as cell extracts which may contain Fringe protein binding partners are passed over the affinity matrix and any bound material is eluted and microsequenced. Suitable methods are available in the scientific literature, for example in Bartley et al . , Nature (1994), 368, 558-560. Expression cloning, for example through expression of cDNA libraries in Cos or other cells followed by binding of labelled Fringe protein to the transfected cells, may also be used to screen for Fringe protein binding partners, for example as described in Matthews et al., Cell (1991) 65, 973-982.
- the identification of proteins or peptides that interact with Fringe Proteins can provide the basis for the design of peptide antagonists or agonists of Fringe protein function. Further, the structure of these peptides determined by standard techniques such as protein NMR or X-ray crystallography can provide the structural basis for the design of small molecule drugs.
- the present invention also provides for the production of transgenic non-human animal models for the study of mammalian Fringe gene function, for the screening of candidate pharmaceutical compounds, for the creation of explanted mammalian cell cultures which express the Fringe proteins or in which a Fringe gene has been inactivated by knock-out deletion, and for the evaluation of potential therapeutic interventions.
- the invention enables a transgenic animal, including a transgenic insect, wherein a genome of the animal or of an ancestor of the animal has been modified by introduction of a transgene comprising a mammalian fringe gene under the transcriptional control of tissue restricted regulatory elements including the mouse mammary-tumour virus long term repeat sequences.
- Transgenic fruit flies which express mammalian Fringe genes may be made as described in the Examples herein. Such transgenic flies may be used to screen for compounds which can repair developmental defects observed in these transgenic flies.
- Transgenic animals may also be made and used similarly. Further, transgenic animals with inappropriate expression of Fringe proteins may be examined for phenotypic changes, for example tumour development, and may be used to screen for compounds with potential as pharmaceuticals. Compounds which provide reversal of the phenotypic changes are candidates for development as pharmaceuticals.
- Transgenic animal models in accordance with the invention can be created by introducing a DNA sequence encoding a selected mammalian Fringe protein either into embryonic stem (ES) cells of a suitable animal, for example a mouse, by transfection or microinjection, or into a germ line or stem cell by a standard technique of oocyte microinjection.
- ES embryonic stem
- the ES cells are inserted into a young embryo and this embryo or an injected oocyte are implanted into a pseudo-pregnant foster mother to grow to term.
- the techniques for generating transgenic animals are now widely known and are described in detail, for example, in Hogan et al . , (1986), and M. Capecchi (1989). Methods of Treatment
- the present invention enables a method for preventing or treating a disorder in a mammal characterised by an abnormality in a signal transduction pathway which involves an interaction between a Notch protein and a Notch ligand, by modulating the Notch protein/Notch ligand interaction.
- the Notch protein/Notch ligand interaction is modulated, in one embodiment, by administration of a mammalian Fringe protein or an effective fragment or analogue therof .
- a further embodiment is a method for treating or preventing such a disorder by promoting or inhibiting the interaction of Notch with its ligands Serrate and Delta by administration of an effective amount of Lunatic Fringe protein, Manic Fringe protein or Radical Fringe protein or of a derivative thereof.
- the invention enables a method for promoting differentiation of a mammalian cell by suppressing expression of Lunatic Fringe protein in the cell and/or promoting expression of Radical Fringe protein and/or Manic Fringe protein in the cell.
- the invention enables a method for suppressing differentiation of a cell by suppressing expression of Radical Fringe protein and/or Manic Fringe protein in the cell and/or promoting expression of Lunatic Fringe protein in the cell.
- Notch4 receptor is highly expressed in endothelial cells 1 .
- Jagged 1 protein is induced by fibrin in human endothelial cells 2 .
- Notch signalling may therefore be an important regulator of endothelial cell migration, proliferation and cell fate specification. In humans, vasculature and cardiovascular system malfunction accounts for a very large number of deaths.
- Fringe proteins, and analogues are important applications of the Fringe proteins, and analogues.
- Fringe proteins, Fringe anti- sense oligonucleotides 3 or other reagents to modify fringe function locally may be used to alter Notch activation and therefore the migration and proliferation of cells within vessels.
- These reagents may also be used to regulate or treat symptoms related to atherosclerosis, cardiovascular disease or diseases related to angiogenesis, including cancer.
- the invention enables a method for identifying compounds which can modulate the expression of mammalian a Fringe gene comprising contacting a cell with a candidate compound wherein the cell includes a regulator of a Fringe gene operably joined to a coding region; and detecting a change in expression of the coding region.
- the invention enables a method for identifying compounds which can selectively bind to a mammalian Fringe protein comprising providing a preparation including at least one mammalian Fringe protein; contacting the preparation with a candidate compound; and determining binding of the Fringe protein to the compound .
- Suitable methods for such screening include affinity chromatography, co-immunoprecipitation, biomolecular interaction assay.
- the invention enables a method for identifying compounds which can modulate the activity of a Fringe protein to promote or inhibit the interaction of a Notch receptor and a Notch ligand.
- Methods are also enabled to identify compounds which can modulate the interaction of a Fringe protein with a Notch receptor signal transduction pathway.
- wing development in Drosophila melanogaster can be used as a screening tool for evaluating fringe/notch interactions.
- Cell culture assays may be developed to measure fringe function in vi tro . Inhibition of the specific fringe response including an alteration in notch function could be used to assay for chemicals which inhibit or enhance fringe function.
- the invention enables a method for identifying a compound useful for preventing or treating a disorder in a mammal characterised by an abnormality in a signal transduction pathway which involves an interaction between a Notch receptor and Notch ligand, the method comprising screening candidate compounds for their ability to promote or inhibit the interaction of a Fringe protein with the Notch signal transduction pathway.
- the invention enables a method for promoting or inhibiting an interaction between a Notch receptor and a Notch ligand comprising administering an effective amount of a Fringe protein or of a fragment, analogue or derivative thereof.
- the invention enables a method for diagnosing in a subject a disorder characterised by abnormal expression of a Fringe protein comprising obtaining a tissue sample from the subject; determining Fringe protein expression in the tissue sample .
- Tissue samples could be used for isolation of RNA which would then be subjected to RT-PCR analysis using specific primers for fringe genes in order to amplify the cDNA for sequencing.
- Control tissues could be used for comparison of sequence.
- nucleotide probes and antibodies raised to the gene products can be used in a variety of hybridisation and immunological assays to screen for and detect the presence of either a normal or mutated gene or gene product .
- the mammalian proteins share extensive sequence homology with each other as well as with Xenopus and Drosophila Fringe proteins in the C-terminal region, which is predicted to encode the mature Fringe polypeptide in each case.
- D- fringe function has thus far only been characterized in wing margin specification (Irvine and Wieschaus, 1994; Kim et al . , 1995) .
- D-Fringe is required in dorsal cells and must not be expressed in ventral cells of the wing pouch in order for margin tissue to be induced at the D/V boundary.
- Fringe ⁇ /Fringe- expression boundary is therefore thought to be important, rather than simply the presence or absence of Fringe in any particular cell.
- D/V boundary D/V boundary.
- Serrate which is expressed dorsally as well as Delta and Wingless which are expressed ventrally.
- Delta and Wingless which are expressed ventrally.
- These four ligands all cooperate to activate Notch exclusively at the D/V boundary.
- the generation of an ectopic Fringe boundary in the ventral wing pouch must, therefore, be considered in the context of Delta and Wingless which are expressed in the ventral compartment.
- the generation of a novel Fringe boundary in the dorsal wing at the intersection of Fringe " clones with Fringe expressing dorsal cells must be viewed in the context of the dorsal compartment which expresses Serrate.
- D-Fringe facilitates the activation of Notch by Delta, then ectopic Fringe would be expected to induce novel ventral margin by cooperating with ventrally expressed
- Wingless may block
- Vertebrates may use Lunatic Fringe protein to localize Notchl activation during somitogenesis, since Del tal is highly expressed in the forming somite and Lunatic Fringe is highly expressed in the surrounding mesoderm. Deltal may only activate Notchl at the boundary of these expression domains. This hypothesis is consistent with the requirement for Notchl in blocking somite differentiation between the forming somites (Conlon et al . , 1995) . Similarly, Luna ti c Fringe expression in the ventricular zone of the neural tube may render cells responsive to Deltal, which inhibits differentiation of ventricular neuroblasts (Chitnis et al . , 1995) .
- the three mammalian fringe proteins may be used either to facilitate or to block Notch-dependent processes throughout development and adult life by regulating the sensitivity of Notch for specific membrane-bound ligands.
- D-Fringe expression has not been detected in the S2 cell line, which when transfected with Notch, can respond to Delta in vi tro (not shown) (Fortini and Artavanis-Tsakonas, 1994). Therefore Delta does not always require D-Fringe to activate Notch.
- Fringe proteins may modify the function of membrane-bound Notch ligands only in the presence (for Delta) or absence (for Serrate) of Wnt proteins. Biochemical studies are required to define the precise site of interaction between the Fringes and the Notch receptor system.
- Candidate interacting proteins through which the Fringe proteins may regulate the sensitivity and specificity of Notch include Notch itself, as well as Delta, Serrate and Wnts.
- the mammalian Fringe proteins described herein may potentially be used to block cancer by altering Notch function. They may also be used to regulate skin growth and differentiation when applied topically. It is expected that all developing organ systems will have the potential to respond to these proteins. Any normal process which is regulated by signalling through the Notch receptor may be modulated by administration of the Fringe proteins. Further, any pathological condition or disorder which may be ameliorated by inhibition or promotion of signalling through the Notch receptor may be treated by administration of the Fringe proteins described herein.
- cDNA was then used in Taq Polymerase PCR reactions containing IX PCR Buffer (Perkin Elmer), 1 mM MgCl 2 , 0.2 mM dNTPs, 0.01% gelatin, and 1 mg of forward and reverse primers.
- Degenerate primers were as follows : Fringe upstream 5 ' GCC GAA TTC TGG TT(T/C) TG(T/C) CA(T/C) (G/T) TN GA(C/T) GA(C/T) GA(C/T) AA(C/T) TA(C/T)GT (codes for amino acids WFCH(V/F) DDDNYV with 5' EcoRI site); Fringe downstream 5' GCC TCT AGA CA (G/A)AA NCC NGC NCC NCC NGT NGC (G/A)AA CCA (G/A)AA (codes for anti-sense of amino acids FWFATGGAGFC with 5' Xbal site).
- PCR reaction conditions were as follows: initial denaturation at 96°C for 7 min., followed by 2 cycles of 94°C for 50 s, 50°C for 2 min, 72°C for 2 min, 35 cycles of 94°C for 50 s, 55°C for 2 min, 72°C for 1.5 min, and a final incubation of 72°C for
- Table 4 shows a comparison of the predicted mouse
- Drosophila fringe gene One such sequence, which had been obtained from a three month human brain cDNA library, was identified in the expressed sequence tag database (Accession number F13368) . Comparison of the potential translated products from this EST with
- oligonucleotide primers to these two regions were designed (Table 4) and PCR was performed with cDNA from several developing mouse tissues. PCR products were cloned, sequenced and found to contain a mixture of sequences from three genes, including a mouse orthologue of the human EST noted above. A mouse embryo cDNA library was then screened with these three PCR derived probes to isolate the corresponding full length cDNA clone for each gene. These three genes have been named Lunatic fringe, Manic fringe and Radical fringe (the original EST was a fragment of human Radical fringe) .
- Xenopus and mouse lunatic fringe proteins (Wu et al . , 1996) .
- the N-terminus of each protein is variable in both length and sequence.
- the Drosophila Fringe protein N-terminus is significantly longer than all vertebrate Fringe proteins (Irvine and Wieschaus, 1994;
- Drosophila fringe encodes seven cysteine residues which are thought to form disulfide bonds in the native protein (Irvine and Wieschaus, 1994) .
- All vertebrate Fringe proteins (including the three described herein and the two Xenopus published fringe proteins (lunatic, radical) (Wu et al . , 1996) contain six of these cysteines at identical positions suggesting that they may form an essential scaffold for this protein family.
- the spacing of all conserved residues in the Fringe C-terminal region is nearly identical, with only two single amino acid gaps being necessary to line up all vertebrate proteins with each other and with the Drosophila protein.
- the Xenopus Lunatic fringe gene contains a poorly conserved N-terminal region between the leader peptide and a basic motif which is predicted to be the target of proteolytic processing required for maturation of a functional ligand (Wu et al . , 1996) .
- the mouse Luna tic fringe gene also encodes a poorly conserved N-terminal putative "pro region" followed by a basic motif, and therefore, is likely produced as an inactive precursor.
- Manic and Radical Fringe predicted proteins contain only a few amino acid residues between the leader sequence and the conserved C-terminal region common to all Fringe proteins.
- Manic Fringe does not contain a basic cleavage sequence and encodes only 29 amino acids from the start codon to the region where
- mice Radical Fringe is predicted to be cleaved. These 29 amino acids code for little more than the leader sequence, thus Manic Fringe may be secreted in an active form which does not require proteolytic cleavage.
- the mouse Radical Fringe protein also lacks a tetrabasic cleavage site and contains a shorter N-terminus than the Xenopus Radical Fringe gene. From start codon to the location of predicted cleavage in Luna tic fringe genes, the mouse Radical fringe cDNA only encodes forty four amino acids including the leader sequence (Xenopus Radical fringe encodes seventy one amino acids in the corresponding region). Like mouse Manic Fringe, mouse Radical Fringe may not require regulated proteolytic activation.
- RNA samples (10 ug) were electrophoretically separated on a 1.2% agarose/formaldehyde gel, transferred and ultraviolet light cross-linked to Genescreen (Dupont) . Hybridization was performed at 65°C in 1M NaCl , 10% Dextran Sulphate, 1% SDS and 100 mg/ml denatured salmon sperm DNA. Blots were washed twice for 5 min.
- Fringe was a 159 bp EcoRI-PvuII fragment which starts 383 bp downstream of the last amino acid in the coding sequence.
- the probe for Lunatic Fringe was 2kb EcoRI insert from pBK-phagemid vector (clone 24), and the probe for Radical Fringe was a 1.5kb EcoRI insert from pBK-phagemid vector (clone 89) . All probes were random primed-labeled with [a- 32 P]dCTP and 2 x 10 6 cpm/ml were used for hybridization.
- Riboprobes were synthesized using T7 RNA polymerase (Pharmacia, Boehringer Mannheim) , T3 RNA polymerase (Pharmacia) , and SP6 RNA polymerase (Pharmacia) according to the protocol of the manufacturer.
- pBK-.adicaldKpnI (clone 16) was used to synthesize sense (T3) and antisense (T7) probes of 709 bp which span from nt 418 of Radical fringe to 118 nt downstream of coding sequence.
- a probe for Lunatic Fringe was generated by
- GAG ACC TGG ATC (contains EcoRI site) and 5' AGATCT ACC
- AGG ATT GTA GAA GAT CGC (contains Bglll site) and pBK-Lunatic (clone 24) as template.
- the 756 bp PCR product which spans nt 273 to nt 1030 of the Luna tic coding sequence was subcloned into pGemT (Promega) and sense and antisense riboprobes synthesized with SP6 and
- pBK-Manic (clone 30) was digested with EcoRI and a 426 bp EcoRI fragment from 3 ' untranslated region of Manic fringe (begins 284 bp downstream of last coding nt) was subcloned into phosphatase-treated EcoRI-digested pBluescript vector (Stratagene) .
- Sense and antisense Manic riboprobes were synthesized from this plasmid using T3 and T7 polymerases respectively.
- a probe for mouse Serrate-1 was generated using the following primers: 5' TCC AGC TGA CAG AGG TTT CC and 5' GAC CAG AAT GGC AAC AAA ACC TGC.
- the 937 bp PCR product which covers nt 641-1578 of the rat sequence was designed by searching for stretches of DNA identity between rat and chicken Serrate- 1 , which was predicted to be identical in mouse Serrate-1 .
- This PCR product was subcloned into pGemT (Promega) and antisense riboprobes generated by transcribing with T7 RNA polymerase.
- a 777 bp Scal/Pstl fragment of mouse Delta spanning nt 669-1446 was subcloned in pBK (Stratagene) and antisense riboprobes generated using T3 RNA polymerase.
- Embryos were dissected into PBS and extraembryonic tissues removed. Embryos were fixed overnight at 4°C with 4% paraformaldehyde (PFA) in PBS, rinsed once with cold PBT (PBS with 0.1% Tween 20) and dehydrated through an ascending methanol series (25%, 50%, 75%) in PBT and then stored in 100% methanol at -20C until further use.
- Antisense riboprobes were synthesized from the same DNA templates as described previously for section in si tu . , using a digoxygenin RNA labeling kit (Boehringer Mannheim) .
- Embryos were rehydrated through a descending methanol series rinsed twice in PBT, and then bleached for 1 hour at RT in 6% hydrogen peroxide in PBT. After three rinses with PBT, embryos were permeabilized with 10 ug/ml proteinase K (5 min. for E9.5 embryo and 2 min. for E8.5 embryo), rinsed twice with PBT and then fixed with Glutaraldehyde 0.2%/PFA 4%/PBT for 20 min at RT. After fixation, embryos were washed 4X with PBT, washed once with hybridization buffer (50% formamide, 5X SSC [pH
- embryos were washed twice for 30 min at 70°C with solution 1 (50% formamide, 5X SSC [pH 4.5], 1% SDS), washed once for 10 min at 70°C with 50/50 solution l/solution 2 (0.5 M NaCl , 0.01 M Tris [pH 7.5], 0.1% Tween-20) , rinsed 3X with solution 2 at RT, rinsed once at RT with solution 3 (50% formamide, 2X SSC [pH 4.5]), and twice for 30 min at 65°C with solution 3.
- solution 1 50% formamide, 5X SSC [pH 4.5], 1% SDS
- solution 2 0.5 M NaCl , 0.01 M Tris [pH 7.5], 0.1% Tween-20
- Embryos were then rinsed 3X at RT with TBS-TL (137 mM NaCl, 2.7 mM KC1 , 25 mM Tris [pH 7.5] plus 2 mM Levamisole and 0.1% Tween 20) and then incubated for 1 hr at RT with TBS-TL containing 10% heat-inactivated (65C for 30 min) goat serum to prevent non-specific binding of antibody.
- Anti-digoxygenin Fab alkaline phosphatase conjugate (1/5000, Boehringer Mannheim) was preabsorbed in TBS-TL with 1% heat-inactivated goat serum and approximately 3 mg heat -inactivated embryo powder per ml antibody.
- embryos were rinsed 3X with TBS-TL, washed 4X for 1 h with TBS-TL at RT, and then left overnight at 4°C in fresh TBS-TL.
- the buffer was exchanged by washing 3X for 10 min with NTMT (0.1 M NaCl, 0.1 M Tris [pH 9.5], 0.05 M MgCl 2 , 0.1% Tween-20, 2mM levamisole) , and the antibody detection reaction was performed by incubating embryos with detection solution (NTMT with 0.25 mg/ml nitroblue tetrazolium and 0.13 mg/ml 5-bromo-4-chloro-3-indolulphosphate toluidinium) .
- NTMT 0.1 M NaCl, 0.1 M Tris [pH 9.5], 0.05 M MgCl 2 , 0.1% Tween-20, 2mM levamisole
- Detection reactions were complete within 15 min - 1 hour and then embryos were washed twice in PBT. Color was intensified by dehydration/rehydration through ascending and descending methanol/PBT rinses. Embryos were then cleared through 50% and 80% glycerol in CMFET (137 mM NaCl, 3 mM KCl , 8 mM Na 2 HP0 4/ 1.5mM KH2P0 4 , 0.7 mM EDTA, 0.1% EDTA, 0.1% Tween-20) and whole embryos were photographed under transmitted light using a Leica MZ12 microscope with Kodak Tungsten 160 ASA film.
- CMFET 137 mM NaCl, 3 mM KCl , 8 mM Na 2 HP0 4/ 1.5mM KH2P0 4 , 0.7 mM EDTA, 0.1% EDTA, 0.1% Tween-20
- RNA derived from mouse embryos and adult tissues were expressed at all stages of mouse embryonic development analyzed, from day seven of gestation to day seventeen ( Figure 3) .
- Two transcripts were detected for Manic and Radical Fringe genes in mouse embryos.
- the three fringe genes were widely expressed in adult tissues, with Lunatic fringe having a more restricted expression pattern than either Manic or Radical ( Figure 4) .
- Liver RNA samples were underloaded and each of the three fringe genes can be detected in this tissue on longer exposures of these northern blots.
- Manic Fringe and Radical Fringe are often expressed in cells of a more committed cell fate. Both of these genes are expressed in the marginal zones of the neural tube and brain throughout development ( Figure 5F and data not shown) . Both Manic and Radical Fringe are expressed from day Ell.5 to E13.5 in the dorsal root ganglia. These genes are also expressed in E12.5 fetal liver, and in the suprabasal epithelium of both tongue and skin. Manic Fringe also appears to be very highly expressed in megakaryocytes present in the adult spleen ( Figure 5K and 5L) .
- Notch The process of differentiation is often regulated by Notch and its ligands (Artavanis-Tsakonas et al . , 1995) .
- Notch The importance of Notch in differentiation and development of both somites and neural tube has been demonstrated genetically in vertebrates (Chitnis et al . , 1995; Chitnis and Kintner, 1996; Coffman et al . , 1993; Conlon et al . , 1995; Swiatek et al . , 1994).
- Notchl is required for proper segmentation of presomitic mesoderm into somites (Conlon et al . , 1995) .
- Notchl is not, however, required to form somite-like tissue (Conlon et al . , 1995). This observation suggests that activation of Notch may block differentiation of mesoderm into somite tissue at the boundary between adjacent somites.
- Delta family Notch ligands are typically turned on as cells commit to differentiate (Muskavitch, 1994) .
- Analysis of mouse Deltal expression in mesoderm undergoing somitogenesis in E8.5 embryos reveals that Deltal is most strongly expressed in the forming somite ( Figure 7A) (Bettenhausen et al . , 1995). Lunatic Fringe is expressed at this stage in two bands which surround the forming somite ( Figure 7B) .
- Manic fringe cDNA was then subcloned as a Bglll fragment into phosphatase-treated Bglll -digested transformation vector pUAST (Brand and Perrimon, supra) .
- the recombinant plasmids, pUAST- Radical and pUAST- ⁇ fanic, with the open reading frames in the correct orientation relative to the promoter, were used to transform Drosophila embryos using standard microinjection procedures (Spradling, 1986) .
- transgenic flies carrying pUAST-Manic and pUAST- Radical were crossed to
- GAL4 enhancer trap lines The GAL4 drivers used were
- GAL4 ptc (Hinz et al . , 1994), GAL4 C5 which is expressed throughout the wing disc pouch (Yeh et al . , 1995), and
- Wings were dissected from adult flies, mounted in GMM (Lawrence et al . , 1986) and photographed using a Zeiss Axioskop. Pictures of adult fly eyes were obtained by Scanning Electron Microscopy using standard proceedures (Tomlinson and Ready, 1987) .
- Fringe-expressing flies Fringe-expressing flies. Radical Fringe usually only induces loss of margin tissue when expressed at high levels either by an extra copy of the GAL4 ptc driver, extra copies of the pUAST transgene or when present in sensitized genetic backgrounds (see below) .
- GAL4 ptc -driven expression of either of these mammalian fringes causes the disruption of normal margin; but unlike D- fringe, they do not encode the function (s) necessary for induction of an ectopic ventral margin.
- Manic Fringe and Radical Fringe therefore, appear to inhibit Notch activation by its ligands, Serrate and/or Delta, at the D/V boundary, but seem unable to induce Notch activation in either the dorsal or ventral compartments.
- Manic Fringe induces a dramatic reduction in size of the eye ( Figure IE as compared to ID and IF) and fused ocelli (not shown) .
- Wing scalloping (loss of margin) and dramatic reduction of eye size are both phenotypes associated with loss of Serrate function (Speicher et al . , 1994) .
- Radical Fringe flies on the other hand had normal eyes but an extra pair of scutellar setae within the normal proneural region (not shown) (Simpson, 1996) .
- Extramacrochaetae/setae within the proneural region and wing scalloping both represent a failure of processes which depend on Delta signalling (Artavanis-Tsakonas et al., 1995; Muskavitch, 1994).
- the GAL4 enhancer trap line expresses GAL4 in all cells which will become the wing blade (Yeh et al . , 1995) . Crosses between this line and Manic Fringe flies also produced a dramatic loss of margin and wing blade tissue (Figure 1H) . In contrast, crosses between GAL4 C5 and the Radical Fringe flies produced wings with small vein deltas, or vein splitting ( Figure II, see insert) . These distinct phenotypes are characteristic of loss of Serrate function in the case of Manic Fringe, and loss of Delta function in Radical Fringe flies.
- Radical Fringe inhibits the normal margin specification which depends on D-Fringe, Delta, Serrate,
- Murine Lunatic fringe, Manic Fringe and Radical Fringe were each tagged using PCR-mediated mutagenesis on their C-termini with the Flag epitope. These chimeric cDNAs were then cloned into the eukaryotic expression vector pCDNA3. Each Fringe expression construct was transfected into Cos cells and lysates were analyzed for production of tagged Fringe protein by Western blot with anti-Flag antibodies. Independently, we tagged the three mammalian fringe genes with C-terminal myc-epitope tags in the pCDNA3 vector. These proteins were expressed in transfected Cos cells and the myc-tagged Fringe proteins detected on Western blots from cell lysates using anti- myc antibodies.
- Fringe proteins may function as dimers to regulate the sensitivity of Notch Receptors for their ligands.
- the dimeric nature of the Fringes can be used to identify or generate dominant inhibitory alleles or mutants of each Fringe. It is expected that mutant Fringes can be made which can either; (i) still dimerize with wild type proteins but cannot form productive interactions with other Fringe partners or (ii) still interact with Fringe-binding partners but are unable to dimerize with wild type Fringe proteins. Such mutants can be used to block endogenous Fringe function.
- Diaz-Benjumea F. J. and Cohen, S. M. (1995). Serrate signals through Notch to establish a Wingless-dependent organizer at the dorsal/ventral compartment boundary of the Drosophila wing. Development 121, 4215-4225.
- Hedgehog is a signalling protein with a key role in patterning Drosophila imaginal discs. Cell 76, 89-102.
- Green fluorescent protein as a vital marker and reporter of gene expression in Drosophila. Proc. Natl. Acad. Sci.
- Uyttendaele, H. et al . Notch4/int-3 a mammary proto-oncogene, is an endothelial cell-specific mammalian Notch gene, Developmen t 122, 2251-2259 (1996) .
- VLL IS' R QRDSSQ ⁇ LQH CN ⁇ TCS ⁇ K-- YLE TKLK 100
- D- -Fringe 151 DDIFI ⁇ VKTT KNYHDTRL L IIKTWFQLAP DQT FFTDTD 200 y- -Lunatic 151 NDVFIAVKTT KKFHRSRMDL LMDTWISRNK EQTFIFTDGE DEELQ-KKTG 200 m- -Lunatic 151 RDVFIAVKTT RKFHRARLDL LFETWISRHK EMTFIFTDGE DE LA-KLTG 200 m- -Manic 151 -DIFIAVKTT ⁇ AFHR ⁇ RLDL LLDTWVSRIR QQTFIFTDSP DERLQERLGP 200 m- -Padical 151 DDVFIAVKTT RKNHGPRLPL LLRTWISRAP PQTFIFTDGD DPELQMLAGG 200
- GACGTGTACA TCGGCAAGCC CAGCCTGGAC AGGCCCATCC AGGCCACAGA ACGGATCAGC 720
- GGTGTACCCC TCATCCGGAG CGGCCTCTTC CACTCCCACC TAGAGAACCT GCAGCAGGTG 960
- CTGCAGTCAA AAAACCGCAC GAAGCTGGTG CGGTTCTGGT TTGCCACAGG GGGTGCTGGT 600
Abstract
On a cloné et séquencé trois ADNc frangés de mammifère; on a décrit leur interaction avec la voie de signalisation du récepteur de Notch. L'invention propose des méthodes de prévention et de traitement de troubles caractérisés par une anomalie de signalisation du récepteur de Notch.
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CA (1) | CA2268751A1 (fr) |
WO (1) | WO1998017793A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2226087C (fr) | 1995-06-28 | 2012-01-31 | Imperial Cancer Research Technology, Ltd. | Sequences nucleotidiques et proteiques de genes delta de vertebres et procedes fondes sur ces dernieres |
US5780300A (en) * | 1995-09-29 | 1998-07-14 | Yale University | Manipulation of non-terminally differentiated cells using the notch pathway |
GB0019242D0 (en) * | 2000-08-04 | 2000-09-27 | Lorantis Ltd | Assay |
-
1997
- 1997-10-20 EP EP97944671A patent/EP0939814A1/fr not_active Withdrawn
- 1997-10-20 WO PCT/CA1997/000775 patent/WO1998017793A1/fr not_active Application Discontinuation
- 1997-10-20 CA CA002268751A patent/CA2268751A1/fr not_active Abandoned
Non-Patent Citations (1)
Title |
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See references of WO9817793A1 * |
Also Published As
Publication number | Publication date |
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CA2268751A1 (fr) | 1998-04-30 |
WO1998017793A1 (fr) | 1998-04-30 |
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