WO2002029089A9 - Haplotypes of the htatip gene - Google Patents
Haplotypes of the htatip geneInfo
- Publication number
- WO2002029089A9 WO2002029089A9 PCT/US2001/031593 US0131593W WO0229089A9 WO 2002029089 A9 WO2002029089 A9 WO 2002029089A9 US 0131593 W US0131593 W US 0131593W WO 0229089 A9 WO0229089 A9 WO 0229089A9
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- WIPO (PCT)
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- htatip
- haplotype
- seq
- gene
- individual
- Prior art date
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/70—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving virus or bacteriophage
- C12Q1/701—Specific hybridization probes
- C12Q1/702—Specific hybridization probes for retroviruses
- C12Q1/703—Viruses associated with AIDS
Definitions
- This invention relates to variation in genes that encode pharmaceutically-important proteins.
- this invention provides genetic variants of the human HTV- ' l Tat interactive protein, 60 kDa (HTATIP) gene and methods for identifying which variant(s) of this gene is/are possessed by an individual.
- HTV- ' l Tat interactive protein 60 kDa (HTATIP) gene and methods for identifying which variant(s) of this gene is/are possessed by an individual.
- haplotype is the ordered combination of polymorphisms in the sequence of each form of a gene that exists in the population. Because haplotypes represent the variation across each form of a gene, they provide a more accurate and reliable measurement of genetic variation than individual polymorphisms. For example, while specific variations in gene sequences have been associated with a particular phenotype such as disease susceptibility (Roses AD supra; Ulbrecht M et al. 2000 Am JRespir Crit Care Med 161: 469-74) and drug response (Wolfe CR et al.
- HIV-1 Tat interactive protein 60 fcDa (HTATIP) gene or its encoded product.
- the TAT protein of human immunodeficiency virus (HTV) is a powerful activator of HIV gene expression.
- HTATIP also known as ⁇ P60, specifically interacts with the cysteine-rich N- terminal domain of TAT. This interaction causes an augmentation of TAT expression, suggesting that HTATIP may function as a cofactor of TAT and thereby regulate HIV gene expression (Kamine et al.,
- Silencing is an epigenetic form of transcriptional regulation whereby genes are heritably, but not necessarily permanently, inactivated.
- the two Saccharomyces cerevisiae genes SAS2 and SAS3 are closely related to HTATIP. These two proteins are involved in epigenetic silencing, and function in transcriptional regulation and cell cycle exit (Reifsnyder et al.,
- the HIV-1 Tat interactive protein, 60 kDa gene is located on chromosome 11 and contains 14 exons that encode a 513 amino acid protein.
- a reference sequence for the HTATIP gene is shown in the contiguous lines of Figure 1 (Genaissance Reference No. 1861355; SEQ ID NO: 1).
- Reference sequences for the coding sequence (GenBank Accession No. NM_006388.1) and protein are shown in
- PS polymorphic sites
- the polymorphisms at these sites are cytosine or guanine at PS1, adenine or thymine at PS2, thymine or cytosine at PS3, cytosine or adenine at PS4, guanine or adenine at PS5, guanine or cytosine at PS6, cytosine or thymine at PS7, adenine or guanine at PS8, guanine or adenine at PS9, cytosine or thymine at PS 10, cytosine or thymine at PS 11, cytosine or adenine at PS12, thymine or cytosine at PS13, thymine or cytosine at PS14, cytosine or thymine at PS15, guanine or adenine at PS16, adenine or guanine at PS17, cytosine or thymine at PS18 and cytosine or thymine at PS19.
- the inventors have determined the identity of the alleles at these sites in a human reference population of 79 unrelated individuals self-identified as belonging to one of four major population groups: African descent, Asian, Caucasian and Hispanic/Latino. From this information, the inventors deduced a set of haplotypes and haplotype pairs for PS1-PS19 in the HTATIP gene, which are shown below in Tables 4 and 3, respectively. Each of these HTATIP haplotypes constitutes a code that defines the variant nucleotides that exist in the human population at this set of polymorphic sites in the HTATTP gene.
- each HTATIP haplotype also represents a naturally-occurring isoform (also referred to herein as an "isogene") of the HTATIP gene.
- the frequency of each haplotype and haplotype pair within the total reference population and within each of the four major population groups included in the reference population was also determined.
- the invention provides a method, composition and kit for genotyping the HTATIP gene in an individual.
- the genotyping method comprises identifying the nucleotide pair that is present at one or more polymorphic sites selected from the group consisting of PS1, PS2, PS3, PS4, PS5, PS6, PS7, PS8, PS9, PS10, PS11, PS12, PS13, PS14, PS15, PS16, PS17, PS18 and PS19 in both copies of the HTATIP gene from the individual.
- a genotyping composition of the invention comprises an oligonucleotide probe or primer which is designed to specifically hybridize to a target region containing, or adjacent to, one of these novel HTATIP polymorphic sites.
- a genotyping kit of the invention comprises a set of oligonucleotides designed to genotype each of these novel HTATIP polymorphic sites.
- the genotyping method, composition, and kit are useful in determining whether an individual has one of the haplotypes in Table 4 below or has one of the haplotype pairs in Table 3 below.
- the invention also provides a method for haplotyping the HTATIP gene in an individual.
- the haplotyping method comprises determining, for one copy of the HTATIP gene, the identity of the nucleotide at one or more polymorphic sites selected from the group consisting of PS1, PS2, PS3, PS4, PS5, PS6, PS7, PS8, PS9, PS10, PS11, PS12, PS13, PS14, PS15, PS16, PS17, PS 18 and PS 19.
- the haplotyping method comprises determining whether one copy of the individual's HTATIP gene is defined by one of the HTATIP haplotypes shown in Table 4, below, or a sub-haplotype thereof. In a preferred embodiment, the haplotyping method comprises determining whether both copies of the individual's HTATIP gene are defined by one of the HTATIP haplotype pairs shown in Table 3 below, or a sub-haplotype pair thereof. Establishing the HTATIP haplotype or haplotype pair of an individual is useful for improving the efficiency and reliability of several steps in the discovery and development of drugs for treating diseases associated with HTATIP activity, e.g., human immunodeficiency virus (HIV) related diseases.
- HIV human immunodeficiency virus
- the haplotyping method can be used by the pharmaceutical research scientist to validate HTATIP as a candidate target for treating a specific condition or disease predicted to be associated with HTATIP activity. Determining for a particular population the frequency of one or more of the individual HTATIP haplotypes or haplotype pairs described herein will facilitate a decision on whether to pursue HTATIP as a target for treating the specific disease of interest. In particular, if variable HTATIP activity is associated with the disease, then one or more HTATIP haplotypes or haplotype pairs will be found at a higher frequency in disease cohorts than in appropriately genetically matched controls. Conversely, if each of the observed HTATIP haplotypes are of similar frequencies in the disease and control groups, then it may be inferred that variable
- HTATIP activity has little, if any, involvement with that disease.
- the pharmaceutical research scientist can, without a priori knowledge as to the phenotypic effect of any HTATIP haplotype or haplotype pair, apply the information derived from detecting HTATIP haplotypes in an individual to decide whether modulating HTATIP activity would be useful in treating the disease.
- the claimed invention is also useful- in screening for compounds targeting HTATIP to treat a specific condition or disease predicted to be associated with HTATIP activity. For example, detecting which of the HTATIP haplotypes or haplotype pairs disclosed herein are present in individual members of a population with the specific disease of interest enables the pharmaceutical scientist to screen for a compound(s) that displays the highest desired agonist or antagonist activity for each of the HTATIP isoforms present in the disease population, or for only the most frequent HTATIP isofo ⁇ ns present in the disease population.
- the claimed haplotyping method provides the scientist with a tool to identify lead compounds that are more likely to show efficacy in clinical trials.
- Haplotyping the HTATIP gene in an individual is also useful in the design of clinical trials of candidate drugs for treating a specific condition or disease predicted to be associated with HTATIP activity. For example, instead of randomly assigning patients with the disease of interest to the treatment or control group as is typically done now, dete ⁇ nining which of the HTATIP haplotype(s) disclosed herein are present in individual patients enables the pharmaceutical scientist to distribute HTATIP haplotypes and/or haplotype pairs evenly to treatment and control groups, thereby reducing the potential for bias in the results that could be introduced by a larger frequency of a HTATIP haplotype or haplotype pair that is associated with response to the drug being studied in the trial, even if this association was previously unknown. Thus, by practicing the claimed invention, the scientist can more confidently rely on the information learned from the trial, without first determining the phenotypic effect of any HTATIP haplotype or haplotype pair.
- the invention provides a method for identifying an association between a trait and a HTATIP genotype, haplotype, or haplotype pair for one or more of the novel polymorphic sites described herein.
- the method comprises comparing the frequency of the HTATIP genotype, haplotype, or haplotype pair in a population exhibiting the trait with the frequency of the HTATIP genotype or haplotype in a reference population. A higher frequency of the HTATIP genotype, haplotype, or haplotype pair in the trait population than in the reference population indicates the trait is associated with the HTATIP genotype, haplotype, or haplotype pair.
- the trait is susceptibility to a disease, severity of a disease, the staging of a disease or response to a drug.
- the HTATIP haplotype is selected from the haplotypes shown in Table 4, or a sub-haplotype thereof. Such methods have applicability in developing diagnostic tests and therapeutic treatments for human immunodeficiency virus (HIV) related diseases.
- HIV human immunodeficiency virus
- the invention provides an isolated polynucleotide comprising a nucleotide sequence which is a polymorphic variant of a reference sequence for the HTATIP gene or a fragment thereof.
- the reference sequence comprises the contiguous sequences shown in Figure 1 and the polymorphic variant comprises at least one polymorphism selected from the group consisting of guanine at PS I , thymine at PS2, cytosine at PS3, adenine at PS4, adenine at PS5, cytosine at PS6, thymine at PS7, guanine at PS8, adenine at PS9, thymine at PS10, thymine at PS11, adenine at PS 12, cytosine at PS13, cytosine at PS14, thymine at PS15, adenine at PS16, guanine at PS17, thymine at PS 18 and thymine at PS 19.
- a particularly preferred polymorphic variant is an isogene of the HTATIP gene.
- a HTATIP isogene of the invention comprises cytosine or guanine at PS1, adenine or thymine at PS2, thymine or cytosine at PS3, cytosine or adenine at PS4, guanine or adenine at PS5, guanine or cytosine at PS6, cytosine or thymine at PS7, adenine or guanine at PS8, guanine or adenine at PS9, cytosine or thymine at PS10, cytosine or thymine at PS11, cytosine or adenine at PS 12, thymine or cytosine at PS13, thymine or cytosine at PS14, cytosine or thymine at PS15, guanine or adenine at PS16, adenine or guanine at PS17, cytosine or th
- the invention also provides a collection of HTATIP isogenes, referred to herein as a HTATIP genome anthology.
- the invention provides a polynucleotide comprising a polymorphic variant of a reference sequence for a HTATIP cDNA or a fragment thereof.
- the reference sequence comprises SEQ ID NO:2 (Fig.2) and the polymorphic cDNA comprises at least one polymorphism selected from the group consisting of thymine at a position corresponding to nucleotide 99 and cytosine at a position corresponding to nucleotide 769.
- a particularly preferred polymorphic cDNA variant comprises the coding sequence of a HTATIP isogene defined by haplotypes 6 and 15.
- polynucleotides complementary to these HTATIP genomic and cDNA variants are also provided by the invention. It is believed that polymorphic variants of the HTATIP gene will be useful in studying the expression and function of HTATIP, and in expressing HTATIP protein for use in screening for candidate drugs to treat diseases related to HTATIP activity.
- the invention provides a recombinant expression vector comprising one of the polymorphic genomic and cDNA variants operably linked to expression regulatory elements as well as a recombinant host cell transformed or transfected with the expression vector. The recombinant vector and host cell may be used to express HTATIP for protein structure analysis and drug binding studies.
- the present invention also provides nonhuman transgenic animals comprising one or more of the HTATIP polymorphic genomic variants described herein and methods for producing such animals.
- the transgenic animals are useful for studying expression of the HTATIP isogenes in vivo, for in vivo screening and testing of drugs targeted against HTATIP protein, and for testing the efficacy of therapeutic agents and compounds for human immunodeficiency virus (HIV) related diseases in a biological system.
- HIV human immunodeficiency virus
- the present invention also provides a computer system for storing and displaying polymorphism data determined for the HTATIP gene.
- the computer system comprises a computer processing unit; a display; and a database containing the polymorphism data.
- the polymorphism data includes one or more of the following: the polymorphisms, the genotypes, the haplotypes, and the haplotype pairs identified for the HTATIP gene in a reference population.
- the computer system is capable of producing a display showing HTATIP haplotypes organized according to their evolutionary relationships.
- Figure 1 illustrates a reference sequence for the HTATIP gene (Genaissance Reference No. 18 1355 ; contiguous lines), with the start and stop positions of each region of coding sequence - indicated with a bracket ([ or ]) and the numerical position below the sequence and the polymorphic site(s) and polymorphism(s) identified by Applicants in a reference population indicated by the variant nucleotide positioned below the polymorphic site in the sequence.
- SEQ ID NO: 101 is a modified version of SEQ ID NO: 1 that shows the context sequence of each polymorphic site, PS1-PS19, in a uniform format to facilitate electronic searching.
- SEQ ID NO: 101 contains a block of 60 bases of the nucleotide sequence encompassing the centrally-located polymorphic site at the 30 th position, followed by 60 bases of unspecified sequence to represent that each PS is separated by genomic sequence whose composition is defined elsewhere herein.
- Figure 2 illustrates a reference sequence for the HTATIP coding sequence (contiguous lines; SEQ ID NO:2), with the polymorphic site(s) and polymorphism ⁇ ) identified by Applicants in a reference population indicated by the variant nucleotide positioned below the polymorphic site in the ' sequence.
- Figure 3 illustrates a reference sequence for the HTATIP protein (contiguous lines; SEQ ID NO:2)
- the present invention is based on the discovery of novel variants of the HTATIP gene.
- 17 isogenes of the HTATIP gene by characterizing the HTATIP gene found in genomic DNAs isolated from an Index Repository that contains immortalized cell lines from one chimpanzee and 93 human individuals.
- the human individuals included a reference population of 79 unrelated individuals self-identified as belonging to one of four major population groups: Caucasian (21 individuals), African descent (20 individuals), Asian (20 individuals), or Hispanic/Latino (18 individuals). To the extent possible, the members of this reference population were organized into population subgroups by their self-identified ethnogeographic origin as shown in Table 1 below. Table 1. Po ulation Grou s in the Index Re ositor
- the Index Repository contains three unrelated indigenous American Indians (one from each of North, Central and South America), one three-generation Caucasian family (from the CEPH Utah cohort) and one two-generation African-American family.
- the HTATIP isogenes present in the human reference population are defined by haplotypes for 19 polymorphic sites in the HTATIP gene, all of which are believed to be novel.
- the novel HTATIP polymorphic sites identified by the inventors are referred to as PS1-PS19 to designate the order in which they are located in the gene (see Table 2 below).
- the inventors herein also determined the pair of haplotypes for the HTATIP gene present in individual human members of this repository.
- the human genotypes and haplotypes found in the repository for the HTATIP gene include those shown in Tables 3 and 4, respectively.
- the polymorphism and haplotype data disclosed herein are useful for validating whether HTATIP is a suitable target for drugs to treat human immunodeficiency virus (HIV) related diseases, screening for such drugs and reducing bias in clinical trials of such drugs.
- HIV human immunodeficiency virus
- Candidate Gene - A gene which is hypothesized to be responsible for a disease, condition, or the response to a treatment, or to be correlated with one of these.
- Genotype An unphased 5 ' to 3 ' sequence of nucleotide pair(s) found at one or more polymorphic sites in a locus on a pair of homologous chromosomes in an individual.
- genotype includes a L-genotype and/or a sub-genotype as described below.
- Full-genotype The unphased 5 ' to 3 ' sequence of nucleotide pairs found at all polymorphic sites examined herein in a locus on a pair of homologous chromosomes in a single individual.
- Sub-genotype The unphased 5 ' to 3 ' sequence of nucleotides seen at a subset of the polymorphic sites examined herein in a locus on a pair of homologous chromosomes in a single individual.
- Genotyping A process for determining a genotype of an individual.
- Haplotype A 5 ' to 3-' sequence of nucleotides found at one or more polymorphic sites in a locus on a single chromosome from a single individual.
- haplotype includes a full- haplotype and/or a sub-haplotype as described below.
- Full-haplotype The 5 ' to 3 ' sequence of nucleotides found at all polymorphic sites examined herein in a locus on a single chromosome from a single individual.
- Sub-haplotype The 5 ' to 3 ' sequence of nucleotides seen at a subset of the polymorphic sites examined herein in a locus on a single chromosome from a single individual.
- Haplotype pair The two haplotypes found for a locus in a single individual.
- Haplotyping A process for determining one or more haplotypes in an individual and includes use of family pedigrees, molecular techniques and/or statistical inference.
- Haplotype data Information concerning one or more of the following for a specific gene: a listing of the haplotype pairs in each individual in a population; a fisting of the different haplotypes in a population; frequency of each haplotype in that or other populations, and any known associations between one or more haplotypes and a trait.
- Isoform - A particular form of a gene, mRNA, cDNA or the protein encoded thereby, distinguished from other forms by its particular sequence and/or structure.
- Isogene One of the isoforms (e.g., alleles) of a gene found in a population.
- An isogene (or allele) contains all of the polymorphisms present in the particular isoform of the gene.
- Isolated As applied to a biological molecule such as RNA, DNA, oligonucleotide, or protein ⁇ isolated means the molecule is substantially free of other biological molecules such as nucleic acids, proteins, lipids, carbohydrates, or other material such as cellular debris and growth media. Generally, the term “isolated” is not intended to refer to a complete absence of such material or to absence of water, buffers, or salts, unless they are present in amounts that substantially interfere with the methods of the present invention.
- Locus - A location on a chromosome or DNA molecule corresponding to a gene or a physical or phenotypic feature, where physical features include polymorphic sites.
- Naturally-occurring - A term used to designate that the object it is applied to, e.g., naturally- occurring polynucleotide or polypeptide, can be isolated from a source in nature and which has not been intentionally modified by man.
- Nucleotide pair The nucleotides found at a polymorphic site on the two copies of a chromosome from an individual.
- Phased As applied to a sequence of nucleotide pairs for two or more polymorphic sites in a locus, phased means the combination of nucleotides present at those polymorphic sites on a single copy of the locus is known.
- Polymorphism The sequence variation observed in an individual at a polymorphic site. Polymorphisms include nucleotide substitutions, insertions, deletions and microsatelHtes and may, but need not, result in detectable differences in gene expression or protein function.
- Polymorphism data Information concerning one or more of the following for a specific gene: location of polymorphic sites; sequence variation at those sites; frequency of polymorphisms in one or more populations; the different genotypes and/or haplotypes determined for the gene; frequency of one or more of these genotypes and/or haplotypes in one or more populations; any known associations) between a trait and a genotype or a haplotype for the gene.
- Polymorphism Database A collection of polymorphism data arranged in a systematic or methodical way and capable of being individually accessed by electronic or other means.
- Polynucleotide A nucleic acid molecule comprised of single-stranded RNA or DNA or comprised of complementary, double-stranded DNA.
- Population Group A group of individuals sharing a common ethnogeographic origin.
- Reference Population A group of subjects or individuals who are predicted to be representative of the genetic variation found in the general population. Typically, the reference population represents the genetic variation in the population at a certainty level of at least 85%, preferably at least 90%, more preferably at least 95% and even more preferably at least 99%.
- Single Nucleotide Polymorphism SNP
- SNP Single Nucleotide Polymorphism
- Subject A human individual whose genotypes or haplotypes or response to treatment or disease state are to be determined.
- Treatment A stimulus administered internally or externally to a subject.
- Unphased As applied to a sequence of nucleotide pairs for two or more polymorphic sites in a locus, unphased means the combination of nucleotides present at those polymorphic sites on a single copy of the locus is not known.
- the invention also provides compositions and methods for detecting the novel HTATIP polymorphisms, haplotypes and haplotype pairs identified herein.
- compositions comprise at least one oligonucleotide for detecting the variant nucleotide or nucleotide pair located at a novel HTATIP polymorphic site in one copy or two copies of the HTATIP gene.
- oligonucleotides are referred to herein as HTATIP haplotyping oligonucleotides or genotyping oligonucleotides, respectively, and collectively as HTATIP oligonucleotides.
- a HTATIP haplotyping or genotyping oligonucleotide is a probe or primer capable of hybridizing to a target region that contains, or that is located close to, one of the novel polymorphic sites described herein.
- oligonucleotide refers to a polynucleotide molecule having less • than about 100 nucleotides.
- a preferred oligonucleotide of the invention is 10 to 35 nucleotides long. More preferably, the oligonucleotide is between 15 and 30, and most preferably, between 20 and 25 nucleotides in length. The exact length of the oligonucleotide will depend on many factors that are routinely considered and practiced by the skilled artisan.
- oligonucleotide may be comprised of any phosphorylation state of ribonucleotides, deoxyribonucleotides, and acyclic nucleotide derivatives, and other functionally equivalent derivatives.
- oligonucleotides may have a phosphate- free backbone, which may be comprised of linkages such as carboxymethyl, acetamidate, carbamate, polyamide (peptide nucleic acid (PNA)) and the like (Va ⁇ na, R. in Molecular Biology and Biotechnology, A Comprehensive Desk Reference, Ed. R. Meyers, VCH Publishers, Inc. (1995), pages 617-620).
- Oligonucleotides of the invention may be prepared by chemical synthesis using any suitable methodology known in the art, or may be derived from a biological sample, for example, by restriction digestion.
- the oligonucleotides may be labeled, according to any technique known in the art, including use of radiolabels, fluorescent labels, enzymatic labels, proteins, haptens, antibodies, sequence tags and the like.
- Haplotyping or genotyping oligonucleotides of the invention must be capable of specifically hybridizing to a target region of a HTATIP polynucleotide.
- the target region is located in a HTATIP isogene.
- specific hybridization means the oligonucleotide forms an anti- parallel double-stranded structure with the target region under certain hybridizing conditions, while failing to form such a structure when incubated with another region in the HTATIP polynucleotide or with a non-HTATTP polynucleotide under the same hybridizing conditions.
- the oligonucleotide specifically hybridizes to the target region under conventional high stringency conditions.
- oligonucleotide probes and primers suitable for detecting polymorphisms in the HTATIP gene can readily design and test oligonucleotide probes and primers suitable for detecting polymorphisms in the HTATIP gene using the polymorphism information provided herein in conjunction with the known sequence information for the HTATIP gene and routine techniques.
- a nucleic acid molecule such as an oligonucleotide or polynucleotide is said to be a "perfect” or “complete” complement of another nucleic acid molecule if every nucleotide of one of the molecules is complementary to the nucleotide at the corresponding position of the other molecule.
- a nucleic acid molecule is "substantially complementary” to another molecule if it hybridizes to that molecule with sufficient stability to remain in a duplex form under conventional low-stringency conditions. Conventional hybridization conditions are described, for example, by Sambrook J. et al., in Molecular Cloning, A Laboratory Manual, 2 nd Edition, Cold Spring Harbor Press, Cold Spring Harbor, NY (1989) and by Haymes, B .D.
- an oligonucleotide primer may have a non-complementary fragment at its 5' end, with the remainder of the primer being complementary to the target region.
- non-complementary nucleotides may be interspersed into the probe or primer as long as the resulting probe or primer is still capable of specifically hybridizing to the target region.
- ASO allele-specific oligonucleotide
- allele-specificity will depend upon a variety of readily optimized stringency conditions, including salt and formamide concentrations, as well as temperatures for both the hybridization and washing steps. Examples of hybridization and washing conditions typically used for ASO probes are found in Kogan et al., "Genetic Prediction of Hemophilia A" in PCR Protocols, A Guide to Methods and Applications,
- an ASO will be perfectly complementary to one allele while containing a single mismatch for another allele.
- Allele-specific oligonucleotides of the invention include ASO probes and ASO primers.
- ASO probes which usually provide good discrimination between different alleles are those in which a central position of the oligonucleotide probe aligns with the polymorphic site in the target region (e.g., approximately the 7 th or 8 th position in a 15mer, the 8 th or 9 th position in a 16mer, and the 10 th or 11 th position in a 20mer).
- An ASO primer of the invention has a 3 ' terminal nucleotide, or preferably a 3' penultimate nucleotide, that is complementary to only one nucleotide of a particular SNP, thereby acting as a primer for polymerase-mediated extension only if the allele containing that nucleotide is present.
- ASO probes and primers hybridizing to either the coding or noncoding strand are contemplated by the invention.
- a preferred ASO probe for detecting HTATIP gene polymorphisms comprises a nucleotide sequence, listed 5 ' to 3', selected from the group consisting of:
- ATCTTCCSTGAGTCC (SEQ ID NO:4) and its complement, GAGTCACWGGGGCAG (SEQ ID NO: 5) and its complement, CGGTGTCYCTCAAAG (SEQ ID NO: 6) and its complement, CCGGGCCMACAGGGC (SEQ ID NO: 7) and its complement, CTCCCCARGGGGAGA (SEQ ID NO: 8) and its complement, GACGTTGSGGGGCGG (SEQ ID NO:9) and its complement, TCCTGAGYGTGAAGG (SEQ ID NO:10) and its complement, CTTCCGCRTCCCACT (SEQ- ID NO:ll) and its complement, CGCCCCARAGGAAGA (SEQ ID NO:12) and its complement, CTTGTTCYCTTCCTC (SEQ ID NO: 13) and its complement, TCTTCTAYTCTCTGG (SEQ ID NO:14) and its complement, CTTACAAMCTGGTAT (SEQ ID NO:15) and its complement, CACCACA ⁇ TGCCTGT (SEQ ID NO:
- a preferred ASO primer for detecting HTATIP gene polymorphisms comprises a nucleotide sequence, listed 5' to 3', selected from the group consisting of:
- CTAGGAATCTTCCST (SEQ ID NO 23), GCAAGAGGACTCASG (SEQ ID NO 24)
- TCCCCCGAGTCACWG SEQ ID NO 25
- GCAAGACTGCCCCWG SEQ ID NO 26
- CATCCCCGCCCCARA (SEQ ID NO 39)
- CCAGGGTCTTCCTYT (SEQ ID NO 40)
- TTCCTCTCTTCTAYT SEQ ID NO 43
- AAGCCACCAGAGART SEQ ID NO 44
- GCTTGAGAGGCAGYG (SEQ ID NO: 9) ; ACCCCAGCGCCTCRC (SEQ ID NO:50)
- AGAGGCAGTGAGGYG (SEQ ID NO: 51) ; GATTCACCCCAGCRC (SEQ ID NO:52)
- AAGTGGCAGGGCCRT (SEQ ID NO: 55) ; CTAGTTCCTATCAYG (SEQ ID NO: 56)
- CAAGTGAGCCTGGYG (SEQ ID NO: 57) ; CCAGGTAGACAGCRC (SEQ ID NO:58)
- oligonucleotides of the invention hybridize to a target region located one to several nucleotides downstream of one of the novel polymorphic sites identified herein. Such oligonucleotides are useful in polymerase-mediated primer extension methods for detecting one of the novel polymorphisms described herein and therefore such oligonucleotides are referred to herein as "primer-extension oligonucleotides".
- the 3'-terminus of a primer- extension oUgonucleotide is a deoxynucleotide complementary to the nucleotide located immediately adjacent to the polymorphic site.
- a particularly preferred oligonucleotide primer for detecting HTATIP gene polymorphisms by primer extension terminates in a nucleotide sequence, listed 5 ' to 3 ', selected from the group consisting of:
- GGAATCTTCC SEQ ID NO: 61
- AGAGGACTCA SEQ ID NO 62
- CCCGAGTCAC SEQ ID NO: 63
- AGACTGCCCC SEQ ID NO 64
- GGCCCGGGCC SEQ ID NO: 67
- AGCGCCCTGT SEQ ID NO 68
- TGTCTCCCCA (SEQ ID NO: 69) ; TTATCTCCCC (SEQ ID NO 70);
- CCCCTTCCGC (SEQ ID NO:75) ; GGCAGTGGGA ( SEQ ID NO 76) ;
- TCTCTTGTTC (SEQ ID NO: 79) ; AGAGAGGAAG ( SEQ ID NO 80) ;
- CTCTCTTCTA (SEQ ID NO: 81) ; CCACCAGAGA ( SEQ ID NO 82) ;
- TCTCTTACAA (SEQ ID NO: 83) ; AAAATACCAG - ( SEQ ID NO 84);
- ACTCACCACA SEQ ID NO: 85
- AGGACAGGCA SEQ ID NO 86
- TGAGAGGCAG SEQ ID NO:87
- CCAGCGCCTC SEQ ID NO 88
- GGCAGTGAGG SEQ ID NO:89
- TCACCCCAGC SEQ ID NO 90
- CTCTAGGGGA SEQ ID NO: 91
- TTCTGGCTGG SEQ ID NO 92
- TGGCAGGGCC SEQ ID NO: 93
- GTTCCTATCA SEQ ID NO 94
- GTGAGCCTGG SEQ ID NO:95
- GGTAGACAGC SEQ ID NO 96
- TAGCCCACCC SEQ ID NO: 97
- CAGTGGGGGC SEQ ID NO 98
- a composition contains two or more differently labeled HTATIP oligonucleotides for simultaneously probing the identity of nucleotides or nucleotide pairs at two or more polymorphic sites. It is also contemplated that primer compositions may contain two or more sets of allele-specific primer pairs to allow simultaneous targeting and amplification of two or more regions containing a polymorphic site.
- HTATIP oligonucleotides of the invention may also be immobilized on or synthesized on a solid surface such as a microchip, bead, or glass slide (see, e.g., WO 98/20020 and WO 98/2001 ). Such immobilized oligonucleotides may be used in a variety of polymorphism detection assays, including but not limited to probe hybridization and polymerase extension assays.
- Immobilized HTATIP oligonucleotides of the invention may comprise an ordered array of oligonucleotides designed to rapidly screen a DNA sample for polymorphisms in multiple genes at the same time.
- the invention provides a kit comprising at least two HTATIP oligonucleotides packaged in separate containers.
- the kit may also contain other components such as hybridization buffer (where the oligonucleotides are to be used as a probe) packaged in a separate container.
- the kit may contain, packaged in separate containers, a polymerase and a reaction buffer optimized for primer extension mediated by the polymerase, such as PCR.
- the above described oligonucleotide compositions and kits are useful in methods for genotyping and/or haplotyping the HTATIP gene in an individual.
- the terms "HTATIP genotype” and “HTATIP haplotype” mean the genotype or haplotype contains the nucleotide pair or nucleotide, respectively, that is present at one or more of the novel polymorphic sites described herein and may optionally also include the nucleotide pair or nucleotide present at one or more additional polymorphic sites in the HTATIP gene.
- the additional polymorphic sites may be currently known polymorphic sites or sites that are subsequently discovered.
- One embodiment of a genotyping method of the invention involves isolating from the individual a nucleic acid sample comprising the two copies of the HTATIP gene, RNA transcripts thereof or cDNA copies thereof, or a fragment of any of the foregoing, that are present in the individual, and determining the identity of the nucleotide pair at one or more polymorphic sites selected from the group consisting of PS1, PS2, PS3, PS4, PS5, PS6, PS7, PS8, PS9, PS10, PS11, PS12, PS13, PS14- PS15, PS16, PS17, PS18 and PS19 in the two copies to assign a HTATIP genotype to the individual.
- a genotyping method of the invention comprises determining the identity of the nucleotide pair at each of PS 1 -PS 19.
- the nucleic acid sample is isolated from a biological sample taken from the individual, such as a blood sample or tissue sample.
- tissue samples include whole blood, semen, saliva, tears, urine, fecal material, sweat, buccal, skin and hair.
- the nucleic acid sample may be comprised of genomic DNA, mRNA, or cDNA and, in the latter two cases, the biological sample must be obtained from a tissue in which the HTATIP gene is expressed.
- mRNA or cDNA preparations would not be used to detect polymorphisms located in introns or in 5 ' and 3 ' untranslated regions if not present in the mRNA or cDNA. If a HTATIP gene fragment is isolated, it must contain the polymorphic site(s) to be genotyped.
- One embodiment of a haplotyping method of the invention comprises isolating from the individual a nucleic acid sample containing only one of the two copies of the HTATIP gene, mRNA or cDNA, or a fragment of such HTATLP molecules, that is present in the individual and determining in that copy the identity of the nucleotide at one or more polymorphic sites selected from the group consisting of PS1, PS2, PS3, PS4, PS5, PS6, PS7, PS8, PS9, PS10, PS11, PS12, PS13, PS14, PS15, PS16, PS17, PS18 and PS19 in that copy to assign a HTATIP haplotype to the individual.
- the nucleic acid used in the above haplotyping methods of the invention may be isolated using any method capable of separating the two copies of the HTATIP gene or fragment such as one of the methods described above for preparing HTATIP isogenes, with targeted in vivo cloning being the preferred approach.
- any individual clone will typically only provide haplotype information on one of the two HTATIP gene copies present in an individual. If haplotype information is desired for the individual's other copy, additional HTATIP clones will usually need to be examined. Typically, at least five clones should be examined to have more than a 90% probability of haplotyping both copies of the HTATIP gene in an individual.
- the haplotype for one HTATIP allele may be inferred if the individual has a known genotype for the polymorphic sites of interest or if the haplotype frequency or haplotype pair frequency for the individual's population group is known.
- the nucleotide at each of PS1-PS19 is identified.
- the haplotyping method comprises determining whether an individual has one or more of the HTATIP haplotypes shown in Table 4. This can be accomplished by identifying, for one or both copies of the individual's HTATIP gene, the phased sequence of nucleotides present at each of PS1-PS19. This identifying step does not necessarily require that each of PS1-PS19 be directly examined. Typically only a subset of PS1-PS19 will need to be directly examined to assign to an individual one or more of the haplotypes shown in Table 4. This is because at least one polymorphic site in a gene is frequently in strong linkage disequilibrium with one or more other polymorphic sites in that gene (Drysdale, CM et al.
- a HTATIP haplotype pair is determined for an individual by identifying the phased sequence of nucleotides at one or more polymorphic sites selected from the group consisting of PS1, PS2, PS3, PS4, PS5, PS6, PS7, PS8, PS9, PS10, PS11, PS12, PS13, PS14, PS15, PS16, PS17, PS18 andPS19 in each copy of the HTATIP gene that is present in the individual.
- the haplotyping method comprises identifying the phased sequence of nucleotides at each of PS1-PS19 in each copy of the HTATIP gene.
- the identifying step is preferably performed with each copy of the gene being placed in separate containers.
- the two copies are labeled with different tags, or are otherwise separately distinguishable or identifiable, it could be possible in some cases to perform the method in the same container.
- first and second copies of the gene are labeled with different first and second fluorescent dyes, respectively, and an allele-specific oHgonucleotide labeled with yet a third different fluorescent dye is used to assay the polymorphic site(s), then detecting a combination of the first and third dyes would identify the polymorphism in the first gene copy while detecting a combination of the second and third dyes would identify the polymorphism in the second gene copy.
- the identity of a nucleotide (or nucleotide pair) at a polymorphic site(s) may be determined by amplifying a target region(s) containing the polymorphic site(s) directly from one or both copies of the HTATIP gene, or a fragment thereof, and the sequence of the amplified region(s) determined by conventional methods. It will be readily appreciated by the skilled artisan that only one nucleotide wUl be detected at a polymorphic site in individuals who are homozygous at that site, while two different nucleotides will be detected if the individual is heterozygous for that site.
- the polymorphism may be identified directly, known as positive-type identification, or by inference, referred to as negative-type identification.
- a site may be positively determined to be either guanine or cytosine for an individual homozygous at that site, or both guanine and cytosine, if the individual is heterozygous at that site.
- the site may be negatively determined to be not guanine (and thus cytosine/cytosine) or not cytosine (and thus guanine/guanine).
- the target region(s) may be ampHfied using any oligonucleotide-directed ampHfication method, including but not limited to polymerase chain reaction (PCR) (U.S. Patent No.4,965,188), Hgase chain reaction (LCR) (Barany et al., Proc. Natl. Acad. Sci. USA 88:189-193, 1991; WO90/01069), and oHgonucleotide ligation assay (OLA) (Landegren et al., Science 241:1077-1080, 1988).
- PCR polymerase chain reaction
- LCR Hgase chain reaction
- OVA oHgonucleotide ligation assay
- Other known nucleic acid amplification procedures may be used to amplify the target region including transcription-based amplification systems (U.S. Patent No.
- a polymorphism in the target region may also be assayed before or after ampHfication using one of several hybridization-based methods known in the art.
- TypicaUy allele-specific oligonucleotides are utilized in performing such methods.
- the aUele-specific ofigonucleotides may be used as differently labeled probe pairs, with one member of the pair showing a perfect match to one variant of a target sequence and the other member showing a perfect match to a different variant.
- more than one polymorphic site may be detected at once using a set of allele- specific ofigonucleotides or oligonucleotide pairs.
- the members of the set have melting temperatures within 5°C, and more preferably within 2°C, of each other when hybridizing to each of the polymorphic sites being detected.
- Hybridization of an allele-specific oligonucleotide to a target polynucleotide may be performed with both entities in solution, or such hybridization may be performed when either the oligonucleotide or the target polynucleotide is covalently or noncovalently affixed to a solid support. Attachment may be mediated, for example, by antibody-antigen interactions, poly-L-Lys, streptavidin or avidin-biotin, salt bridges, hydrophobic interactions, chemical linkages, UV cross-linking baking, etc. Allele-specific oligonucleotides may be synthesized directly on the solid support or attached to the soUd support subsequent to synthesis.
- Sofid-supports suitable for use in detection methods of the invention include substrates made of sificon, glass, plastic, paper and the like, which may be formed, for example, into weUs (as in 96-weH plates), slides, sheets, membranes, fibers, chips, dishes, and beads.
- the sohd support may be treated, coated or derivatized to facilitate the immobilization of the allele-specific oligonucleotide or target nucleic acid.
- the genotype or haplotype for the HTATIP gene of an individual may also be determined by hybridization of a nucleic acid sample containing one or both copies of the gene, mRNA, cDNA or fragment(s) thereof, to nucleic acid arrays and subarrays such as described in WO 95/11995.
- the arrays would contain a battery of aUele-specific oUgonucleotides representing each of the polymorphic sites to be included in the genotype or haplotype.
- polymorphisms may also be determined using a mismatch detection technique, including but not limited to the RNase protection method using riboprobes (Winter et al., Proc. Natl. Acad. Sci. USA 82:7575, 1985; Meyers et al., Science 230:1242, 1985) and proteins which recognize nucleotide mismatches, such as the E. coU mutS protein (Modrich, P. Ann. Rev. Genet. 25:229-253, 1991).
- riboprobes Winter et al., Proc. Natl. Acad. Sci. USA 82:7575, 1985; Meyers et al., Science 230:1242, 1985
- proteins which recognize nucleotide mismatches such as the E. coU mutS protein (Modrich, P. Ann. Rev. Genet. 25:229-253, 1991).
- variant alleles can be identified by single strand conformation polymorphism (SSCP) analysis (Orita et al., Genomics 5:874-879, 1989; Humphries et al., in Molecular Diagnosis of Genetic Diseases, R. EUes, ed., pp. 321-340, 1996) or denaturing gradient gel electrophoresis (DGGE) (WarteU et al., Nucl. Acids Res. 18:2699-2706, 1990; Sheffield et al., Proc. Natl. Acad. Sci. USA 86:232-236, 1989).
- SSCP single strand conformation polymorphism
- DGGE denaturing gradient gel electrophoresis
- a polymerase ⁇ mediated primer extension method may also be used to identify the polymorphism(s).
- Several such methods have been described in the patent and scientific Kterature and include the "Genetic Bit Analysis” method (W092/15712) and the Hgase/polymerase mediated genetic bit analysis (U.S. Patent 5,679,524.
- Related methods are disclosed in WO91/02087, WO90/09455, W095/17676, U.S. Patent Nos. 5,302,509, and 5,945,283.
- Extended primers containing a polymorphism may be detected by mass spectrometry as described in U.S. Patent No. 5,605,798.
- Another primer extension method is aUele-specific PCR (Ruano et al., Nucl. Acids Res. 17:8392, 1989; Ruano et al., Nucl. Acids Res. 19, 6877-6882, 1991; WO 93/22456; Turki et al., /. Clin. Invest. 95:1635-1641, 1995).
- multiple polymorphic sites may be investigated by simultaneously amplifying multiple regions of the nucleic acid using sets of aUele-specific primers as described in Wallace et al. (WO89/10414).
- the identity of the allele(s) present at any of the novel polymorphic sites described herein may be indirectly determined by haplotyping or genotyping another polymorphic site that is in linkage disequilibrium with the polymorphic site that is of interest.
- Polymorphic sites in linkage disequilibrium with the presently disclosed polymorphic sites may be located in regions of the gene or in other genomic regions not examined herein.
- Detection of the aUele(s) present at a polymorphic site in linkage disequilibrium with the novel polymorphic sites described herein may be performed by, but is not limited to, any of the above-mentioned methods for detecting the identity of the aUele at a polymorphic site.
- an individual's HTATIP haplotype pair is predicted from its HTATIP genotype using information on haplotype pairs known to exist in a reference population.
- the haplotyping prediction method comprises identifying a HTATIP genotype for the individual at two or more HTATIP polymorphic sites described herein, accessing data containing HTATIP haplotype pairs identified in a reference population, and assigning a haplotype pair to the individual that is consistent with the genotype data.
- the reference haplotype pairs include the HTATIP haplotype pairs shown in Table 3.
- the HTATIP haplotype pah- can be assigned by comparing the individual's genotype with the genotypes corresponding to the haplotype pairs known to exist in the general population or in a specific population group, and determining which haplotype pair is consistent with the genotype of the individual.
- comparison of the genotype of the individual to the haplotype pairs identified in a reference population and determination of which haplotype pair is consistent with the genotype of the - individual may be performed by visual inspection (for example, by consulting Table 3).
- haplotype pair frequency data (such as that presented in Table 6) may be used to determine which of these haplotype pairs is most likely to be present in the individual.
- This determination may also be performed in some embodiments by visual inspection upon consulting Table 6. If a particular HTATIP haplotype pair consistent with the genotype of the individual is more frequent in the reference population than others consistent with the genotype, then that haplotype pair with the highest frequency is the most likely to be present in the individual. In other embodiments, the comparison may be made by a computer- implemented algorithm with the genotype of the individual and the reference haplotype data stored in computer-readable formats.
- one computer-implemented algorithm to perform this comparison entails enumerating aU possible haplotype pairs which are consistent with the genotype, accessing data containing HTATIP haplotype pairs frequency data determined in a reference population to determine a probabiHty that the individual has a possible haplotype pair, and analyzing the determined probabilities to assign a haplotype pair to the individual.
- the reference population should be composed of randomly-selected individuals representing the major ethnogeographic groups of the world.
- a preferred reference population allows the detection of any haplotype whose frequency is at least 10% with about 99% certainty and comprises about 20 unrelated individuals from each of the four population groups named above.
- a particularly preferred reference population includes a 3-generation family representing one or more of the four population groups to serve as controls for checking quahty of haplotyping procedures.
- the haplotype frequency data for each ethnogeographic group is examined to determine whether it is consistent withHardy-Weinberg equilibrium.
- a statisticaUy significant difference between the observed and expected haplotype frequencies could be due to one or more factors including significant inbreeding in the population group, strong selective pressure on the gene, sampling bias, and/or errors in the genotyping process. If large deviations from ⁇ ardy-Weinberg equilibrium are observed in an ethnogeographic group, the number of individuals in that group can be increased to see if the deviation is due to a sampling bias. If a larger sample size does not reduce the difference between observed and expected haplotype pair frequencies, then one may wish to consider haplotyping the individual using a direct haplotyping method such as, for example, CLASPER Systran TM technology (U.S. Patent No.
- the assigning step involves performing the following analysis. First, each of the possible haplotype pairs is compared to the haplotype pairs in the reference population. Generally, only one of the haplotype pairs in the reference population matches a possible haplotype pair and that pair is assigned to the individual.
- haplotype pair in an individual may be predicted from the individual's genotype for that gene using reported methods (e.g., Clark et al. 1990 Mol Bio Evol 7:111-22; copending PCT US01/12831 filed April 18, 2001 ) or through a commercial haplotyping service such as offered by Genaissance Pharmaceuticals, Inc. (New Haven, CT).
- the individual is preferably haplotyped using a direct molecular haplotyping method such as, for example, CLASPER SystemTM technology (U.S. Patent No. 5,866,404), SMD, or allele-specific long-range PCR (Michalotos-Beloin et al., supra).
- a direct molecular haplotyping method such as, for example, CLASPER SystemTM technology (U.S. Patent No. 5,866,404), SMD, or allele-specific long-range PCR (Michalotos-Beloin et al., supra).
- the invention also provides a method for determining the frequency of a HTATIP genotype, haplotype, or haplotype pair in a population.
- the method comprises, for each member of the population, determining the genotype or the haplotype pair for the novel HTATIP polymorphic sites described herein, and calculating the frequency any particular genotype, haplotype, or haplotype pair is found in the population.
- the population may be e.g., a reference population, a family population, a same gender population, a population group, or a trait population (e.g., a group of individuals exhibiting a trait of interest such as a medical condition or response to a therapeutic treatment).
- frequency data for HTATIP genotypes, haplotypes, and/or haplotype pairs are determined in a reference population and used in a method for identifying an association between a trait and a HTATIP genotype, haplotype, or haplotype pair.
- the trait may be any detectable phenotype, including but not limited to susceptibility to a disease or response to a treatment.
- the method involves obtaining data on the frequency of the genotype(s), haplotype(s), or haplotype pair(s) of interest in a reference population as weU as in a population exhibiting the trait.
- Frequency data for one or both of the reference and trait populations may be obtained by genotyping or haplotyping each individual in the populations using one or more of the methods described above.
- the haplotypes for the trait population may be determined directly or, alternatively, by a predictive genotype to haplotype approach as described above.
- the frequency data for the reference and/or trait populations is obtained by accessing previously determined frequency data, which may be in written or electronic form.
- the frequency data may be present in a database that is accessible by a computer. Once the frequency data is obtained, the frequencies of the genotype(s), haplotype(s), or haplotype pair(s) of interest in the reference and trait populations are compared.
- the frequencies of aU genotypes, haplotypes, and/or haplotype pairs observed in the populations are compared. If a particular HTATIP genotype, haplotype, or haplotype pair is more frequent in the trait population than in the reference population at a statistically significant amount, then the trait is predicted to be associated with that HTATIP genotype, haplotype or haplotype pair.
- the HTATIP genotype, haplotype, or haplotype pair being compared in the trait and reference populations is selected from the full-genotypes and full-haplotypes shown in Tables 3 and 4, or from sub-genotypes and sub-haplotypes derived from these genotypes and haplotypes.
- the trait of interest is a clinical response exhibited by a patient to some therapeutic treatment, for example, response to a drug targeting HTATIP or response to a therapeutic treatment for a medical condition.
- medical condition includes but is not limited to any condition or disease manifested as one or more physical and/or psychological symptoms for which treatment is desirable, and includes previously and newly identified diseases and other disorders.
- clinical response means any or aU of the following: a quantitative measure of the response, no response, and/or adverse response (i.e., side effects).
- clinical trial means any research study designed to coUect clinical data on responses to a particular treatment, and includes but is not limited to phase I, phase H and phase HI clinical trials. Standard methods are used to define the patient population and to enroU subjects.
- the individuals included in the clinical population have been graded for the existence of the medical condition of interest. This is important in cases where the symptom(s) being presented by the patients can be caused by more than one underlying condition, and where treatment of the underlying conditions are not the same. An example of this would be where patients experience breathing difficulties that are due to either asthma or respiratory infections. If both sets were treated with an asthma medication, there would be a spurious group of apparent non-responders that did not actually have asthma. These people would affect the abiHty to detect any correlation between haplotype and treatment outcome. This grading of potential patients could employ a standard physical exam or one or more lab tests.
- grading of patients could use haplotyping for situations where there is a strong correlation between haplotype pair and disease susceptibility or severity.
- the therapeutic treatment of interest is administered to each individual in the trial population and each individual's response to the treatment is measured using one or more predetermined criteria. It is contemplated that in many cases, the trial population wiH exhibit a range of responses and that the investigator wiU choose the number of responder groups (e.g., low, medium, high) made up by the various responses.
- the HTATIP gene for each individual in the trial population is genotyped and or haplotyped, which may be done before or after administering the treatment.
- correlations between individual response and HTATIP genotype or haplotype content are created. Correlations may be produced in several ways. In one method, individuals are grouped by their HTATIP genotype or haplotype (or haplotype pair) (also referred to as a polymorphism group), and then the averages and standard deviations of clinical responses exhibited by the members of each polymorphism group are calculated.
- a second method for finding correlations between HTATIP haplotype content and clinical responses uses predictive models based on error-rninimizing optimization algorithms.
- One of many possible optimization algorithms is a genetic algorithm (R. Judson, "Genetic Algorithms and Their Uses in Chemistry” in Reviews in Computational Chemistry, Vol. 10, pp. 1-73, K. B. Lipkowitz and D. B. Boyd, eds. (VCH Publishers, New York, 1997).
- Simulated annealing Press et al., "Numerical Recipes in C: The Art of Scientific Computing", Cambridge University Press (Cambridge) 1992, Ch. 10), neural networks (E. Rich and K.
- Correlations may also be analyzed using analysis of variation (ANOVA) techniques to determine how much of the variation in the clinical data is explained by different subsets of the polymorphic sites in the HTATIP gene.
- ANOVA analysis of variation
- ANOVA is used to test hypotheses about whether a response variable is caused by or correlated with one or more traits or variables that can be measured (Fisher and vanBeUe, supra, Ch. 10).
- a mathematical model may be readily constructed by the skiUed artisan that predicts clinical response as a function of HTATIP genotype or haplotype content.
- the model is validated in one or more follow-up clinical trials designed to test the model. The identification of an association between a clinical response and a genotype or haplotype
- the diagnostic method may take one of several forms: for example, a direct DNA test (i.e., genotyping or haplotyping one or more of the polymorphic sites in the HTATIP gene), a serological test, or a physical exam measurement.
- a direct DNA test i.e., genotyping or haplotyping one or more of the polymorphic sites in the HTATIP gene
- a serological test i.e., a serological test
- a physical exam measurement i.e., a physical exam measurement. The only requirement is that there be a good correlation between the diagnostic test results and the underlying HTATIP genotype or haplotype that is in turn correlated with the clinical response.
- this diagnostic method uses the predictive haplotyping method described above.
- the invention provides an isolated polynucleotide comprising a polymorphic variant of the HTATIP gene or a fragment of the gene which contains at least one of the novel polymorphic sites described herein.
- the nucleotide " sequence of a variant HTATIP gene is identical to the reference genomic sequence for those portions of the gene examined, as described in the Examples below, except that it comprises a different nucleotide at one or more of the novel polymorphic sites PS1, PS2, PS3, PS4, PS5, PS6, PS7, PS8, PS9, PS10, PS11, PS12, PS13, PS14, PS15, PS16, PS17/PS18 and PS19.
- nucleotide sequence of a variant fragment of the HTATIP gene is identical to the corresponding portion of the reference sequence except for having a different nucleotide at one or more of the novel polymorphic sites described herein.
- the invention specifically does not include polynucleotides comprising a nucleotide sequence identical to the reference sequence of the HTATIP gene, which is defined by haplotype 7, (or other reported HTATIP sequences) or to portions of the reference sequence (or other reported HTATIP sequences), except for the haplotyping and genotyping oHgonucleotides described above.
- the location of a polymorphism in a variant HTATIP gene or fragment is preferably identified by aHgning its sequence against SEQ ID NO:l.
- the polymorphism is selected from the group consisting of guanine at PS 1 , thymine at PS2, cytosine at PS3, adenine at PS4, adenine at PS5, cytosine at PS6, thymine at PS7, guanine at PS8, adenine at PS9, thymine at PS10, thymine at PS11, adenine at PS12, cytosine at PS13, cytosine at PS14, thymine at PS15, adenine at PS16, guanine at PS17, thymine at PS18 and thymine at PS19.
- the polymorphic variant comprises a naturally-occurring isogene of the HTATIP gene which is defined by any one of haplotypes 1- 6 and 8 - 17 shown in Table 4 below.
- Polymorphic variants of the invention may be prepared by isolating a clone containing the HTATIP gene from a human genomic library.
- the clone may be sequenced to determine the identity of the nucleotides at the novel polymorphic sites described herein.
- Any particular variant or fragment thereof, that is claimed herein could be prepared from this clone by performing in vitro mutagenesis using procedures well-known in the art.
- Any particular HTATIP variant or fragment thereof may also be prepared using synthetic or semi-synthetic methods known in the art.
- HTATIP isogenes, or fragments thereof may be isolated using any method that allows separation of the two "copies" of the HTATIP gene present in an individual, which, as readily understood by the skfiled artisan, may be the same allele or different alleles. Separation methods include targeted in vivo cloning (TIVC) in yeast as described in WO 98/01573, U.S. Patent No. 5,866,404, and U.S. Patent No. 5,972,614. Another method, which is described in U.S. Patent No. 5,972,614, uses an aUele specific oligonucleotide in combination with primer extension and exonuclease degradation to generate hemizygous DNA targets.
- TIVC targeted in vivo cloning
- Another method which is described in U.S. Patent No. 5,972,614, uses an aUele specific oligonucleotide in combination with primer extension and exonuclease degradation to generate hemizygous
- HTATIP genome anthologies which are collections of at least two HTATIP isogenes found in a given population.
- the population may be any group of at least two individuals, including but not limited to a reference population, a population group, a family population, a clinical population, and a same gender population.
- a HTATIP genome anthology may comprise individual HTATIP isogenes stored in separate containers such as microtest tubes, separate wells of a microtitre plate and the like. Alternatively, two or more groups of the HTATIP isogenes in the anthology may be stored in separate containers. Individual isogenes or groups of such isogenes in a genome anthology may be stored in any convenient and stable form, including but not limited to in buffered solutions, as DNA precipitates, freeze-dried preparations and the like.
- a preferred HTATIP genome anthology of the invention comprises a set of isogenes defined by the haplotypes shown in Table 4 below. A HTATIP genome anthology is useful in providing control nucleic acids for kits of the invention.
- An isolated polynucleotide containing a polymorphic variant nucleotide sequence of the invention may be operably linked to one or more expression regulatory elements in a recombinant expression vector capable of being propagated and expressing the encoded HTATIP protein in a prokaryotic or a eukaryotic host ceH.
- expression regulatory elements which may be used include, but are not limited to, the lac system, operator and promoter regions of phage lambda, yeast promoters, and promoters derived from vaccinia virus, adenovirus, retroviruses, or SV40, Other regulatory elements include, but are not limited to, appropriate leader sequences, termination codons, polyadenylation signals, and other sequences required for the appropriate transcription and subsequent translation of the nucleic acid sequence in a given host cell. Of course, the correct combinations of expression regulatory elements will depend on the host system used. In addition, it is understood that the expression vector contains any additional elements necessary for its transfer to and subsequent rephcation in the host ceH.
- Such elements include, but are not limited to, origins of repHcation and selectable markers.
- Such expression vectors are commerciaUy available or are readily constructed using methods known to those in the art (e.g., F. Ausubel et al., 1987, in "Current Protocols in Molecular Biology", John Wiley and Sons, New York, New York).
- Host cells which may be used to express the variant HTATIP sequences of the invention include, but are not limited to, eukaryotic and mammalian cells, such as animal, plant, insect and yeast ceHs, and prokaryotic ceUs, such as E. coli, or algal ceHs as known in the art.
- the recombinant expression vector may be introduced into the host ceU using any method known to those in the art including, but not limited to, microinjection, electroporation, parti -'e bombardment, transduction, and transfection using DEAE- dextran, lipofection, or calcium phosphate (see e.g., Sambrook et al. (1989) in "Molecular Cloning. A Laboratory Manual” , Cold Spring Harbor Press, Plainview, New York) .
- eukaryotic expression vectors that function in eukaryotic ceUs, and preferably mammaUan cells, are used.
- Non-limiting examples of such vectors include vaccinia virus vectors, adenovirus vectors, herpes virus vectors, and baculovirus transfer vectors.
- Preferred eukaryotic cell lines include COS ceUs, CHO ceHs, HeLa ceUs, NIH/3T3 cells, and embryonic stem cells (Thomson, J. A. et al., 1998 Science 282: 1145-1147).
- Particularly preferred host ceUs are mammaHan ceHs.
- HTATIP mRNAs varying from each other at any polymorphic site retained in the spliced and processed mRNA molecules.
- mRNAs can be used for the preparation of a HTATIP cDNA comprising a nucleotide sequence which is a polymorphic variant of the HTATIP reference coding sequence shown in Figure 2.
- the invention also provides HTATIP mRNAs and corresponding cDNAs which comprise a nucleotide sequence that is identical to SEQ ID NO:2 (Fig.
- a particularly preferred polymorphic cDNA variant comprises the coding sequence of a HTATIP isogene defined by any one of.haplotypes 6 and 15. Fragments of these variant mRNAs and cDNAs are included in the scope of the invention, provided they contain one or more of the novel polymorphisms described herein.
- the invention specifically excludes polynucleotides identical to previously identified and characterized HTATIP mRNAs, cDNAs or fragments thereof.
- Polynucleotides comprising a variant HTATIP RNA or DNA sequence may be isolated from a biological sample using weU-known molecular biological procedures or may be chemicaHy synthesized.
- a polymorphic variant of a HTATIP gene, mRNA or cDNA fragment comprises at least one novel polymorphism identified herein and has a length of at least 10 nucleotides and may range up to the full length of the gene.
- such fragments are between 100 and 3000 nucleotides in length, and more preferably between 200 and 2000 nucleotides in length, and most preferably between 500 and 1000 nucleotides in length.
- nucleic acid molecules containing the HTATIP gene or cDNA maybe complementary double stranded molecules and thus reference to a particular site on the sense strand refers as well to the corresponding site on the complementary antisense strand.
- the invention also includes single-stranded polynucleotides which are complementary to the sense strand of the HTATIP genomic, mRNA and cDNA variants described herein.
- Polynucleotides comprising a polymorphic gene variant or fragment of the invention may be useful for therapeutic purposes.
- an expression vector encoding the isoform may be administered to the patient.
- the patient may be one who lacks the HTATIP isogene encoding that isoform or may already have at least one copy of that isogene. In other situations, it may be desirable to decrease or block expression of a particular HTATIP isogene.
- Expression of a HTATIP isogene may be turned off by transforming a targeted organ, tissue or cell population with an expression vector that expresses high levels of untranslatable mRNA or antisense RNA for the isogene or fragment thereof.
- oligonucleotides directed against the regulatory regions (e.g., promoter, introns, enhancers, 3' untranslated region) of the isogene may block transcription.
- OHgonucleotides targeting the transcription initiation site e.g., between positions -10 and +10 from the start site are preferred.
- inhibition of transcription can be achieved using oHgonucleotides that base-pair with region(s) of the isogene DNA to form triplex DNA (see e.g., Gee et al. in Huber, B.E. and B.I. Carr, Molecular and Immunologic Approaches, Futura PubHshing Co., Mt. Kisco, N.Y., 1994).
- Antisense oHgonucleotides may also be designed to block translation of HTATIP mRNA transcribed from a particular isogene. It is also contemplated that ribozymes may be designed that can catalyze the specific cleavage of HTATIP mRNA transcribed from a particular isogene.
- the untranslated mRNA, antisense RNA or antisense oHgonucleotides may be defivered to a target cell or tissue by expression from a vector introduced into the cell or tissue in vivo or ex vivo.
- such molecules may be formulated as a pharmaceutical composition for administration to the patient.
- Oligoribonucleotides and/or oHgodeoxynucleotides intended for use as antisense oligonucleotides may be modified to increase stabifity and half-life.
- Possible modifications- include, but are not limited to phosphorothioate or 2' 0-methyl linkages, and the inclusion of nontraditional- bases such as inosine and queosine, as well as acetyl-, methyl-, thio-, and similarly modified forms of adenine, cytosine, guanine, thymine, and uracil which are not as easily recognized by endogenous nucleases. Effect(s) of the polymorphisms identified herein on expression of HTATIP may be investigated by preparing recombinant ceUs and/or nonhuman recombinant organisms, preferably recombinant animals, containing a polymorphic variant of the HTATIP gene.
- expression includes but is not limited to one or more of the foUowing: transcription of the " gene into precursor mRNA; splicing and other processing of the precursor mRNA to produce mature mRNA; mRNA stabiHfy; translation of the mature mRNA into HTATIP protein (including codon usage and tRNA availabiUty); and glycosylation and/or other modifications of the translation product, if required for proper expression and function.
- the desired HTATIP isogene may be introduced into the cell in a vector such that the isogene remains extrachromosomal.
- the gene wiU be expressed by the cell from the extrachromosomal location.
- the HTATIP isogene is introduced into a ceU in such a way that it recombines with the endogenous HTATIP gene present in the ceU. Such recombination requires the occurrence of a double recombination event, thereby resulting in the desired HTATIP gene polymorphism.
- vectors for the introduction of genes both for recombination and for extrachromosomal maintenance are known in the art, and any suitable vector or vector construct may be used in the invention. Methods such as . electroporation, particle bombardment, calcium phosphate co-precipitation and viral transduction for introducing DNA into cells are known in the art; therefore, the choice of method may lie with the competence and preference of the skilled practitioner.
- ceUs into which the HTATIP isogene may be introduced include, but are not limited to, continuous culture cells, such as COS, NIH/3T3, and primary or culture ceHs of the relevant tissue type, i.e., they express the HTATIP isogene. Such recombinant ceUs can be used to compare the biological activities of the different protein variants.
- Recombinant nonhuman organisms i.e., transgenic animals, expressing a variant HTATIP gene are prepared using standard procedures known in the art.
- a construct comprising the variant gene is introduced into a nonhuman animal or an ancestor of the animal at an embryonic stage, i.e., the one-cell stage, or generaUy not later than about the eight-ceU stage.
- Transgenic animals carrying the constructs of the invention can be made by several methods known to those having skfil in the art. One method involves transfecting into the embryo a retrovirus constructed to contain one or .
- insulator elements More insulator elements, a gene or genes of interest, and other components known to those skilled in the art to provide a complete shuttle vector harboring the insulated gene(s) as a transgene, see e.g., U.S. Patent No. 5,610,053.
- Another method involves directly injecting a transgene into the embryo.
- a third method involves the use of embryonic stem ceUs. Examples of animals into which the HTATIP isogenes may be introduced include, but are not limited to, mice, rats, other rodents, and nonhuman primates (see "The Introduction of Foreign Genes into Mice" and the cited references therein, In: Recombinant DNA, Eds. J.D. Watson, M. Gilman, J. Witkowski, and M.
- Transgenic animals stably expressing a human HTATIP isogene and producing the encoded human HTATIP protein can be used as biological models for studying diseases related to abnormal HTATIP expression and/or activity, and for screening and assaying various candidate drugs, compounds, and treatment regimens to reduce the symptoms or effects of these diseases.
- compositions for treating disorders affected by expression or function of a novel HTATIP isogene described herein.
- the pharmaceutical composition may comprise any of the following active ingredients: a polynucleotide comprising one of these novel HTATIP isogenes; an antisense oHgonucleotide directed against one of the novel HTATIP isogenes, a polynucleotide encoding such an antisense oHgonucleotide, or another compound which inhibits expression of a novel HTATIP isogene described herein.
- the composition contains the active ingredient in a therapeuticaUy effective amount.
- therapeuticaUy effective amount is meant that one or more of the symptoms relating to disorders affected by expression or function of a novel HTATIP isogene is reduced and/or eliminated.
- the composition also comprises a pharmaceutically acceptable carrier, examples of which include, but are not limited to, saline, buffered saline, dextrose, and water. Those skilled in the art may employ a formulation most suitable for the active ingredient, whether it is a polynucleotide, oHgonucleotide, protein, peptide or smaU molecule antagonist.
- the pharmaceutical composition may be administered alone or in combination with at least one other agent, such as a stabiHzing compound.
- Administration of the pharmaceutical composition may be by any number of routes including, but not limited t oral, intravenous, intramuscular, intra-arterial, intramedullary, intrathecal, intraventricular, intradermal, transdermal, subcutaneous, intraperitoneal, intranasal, enteral, topical, sublingual, or rectal. Further details on techniques for formulation and administration may be found in the latest edition of Remington's Pharmaceutical Sciences (Maack Pubfishing Co., Easton, PA).
- the dose can be estimated initiaUy either in cell culture assays or in animal models.
- the animal model may also be used to determine the appropriate concentration range and route of administration.
- Such information can then be used to determine useful doses and routes for administration in humans.
- the exact dosage wiU be determined by the practitioner, in light of factors relating to the patient requiring treatment, including but not limited to severity of the disease state, general health, age, weight and gender of the patient, diet, time and frequency of administration, other drugs being taken by the patient, and tolerance/response to the treatment.
- any or all analytical and mathematical operations involved in practicing the methods of the present invention may be implemented by a computer.
- the computer may execute a program that generates views (or screens) displayed on a display device and with which the user can interact to view and analyze large amounts of information relating to the HTATIP gene and its genomic variation, including chromosome location, gene structure, and gene family, gene expression data, polymorphism data, genetic sequence data, and clinical data population data (e.g., data on ethnogeographic origin, clinical responses, genotypes, and haplotypes for one or more populations).
- the HTATIP polymorphism data described herein may be stored as part of a relational database (e.g., . an instance of an Oracle database or a set of ASCII flat files).
- polymorphism data may be stored on the computer's hard drive or may, for example, be stored on a CD-ROM or on one or more other storage devices accessible by the computer.
- the data may be stored on one or more databases in communication with the computer via a network.
- This example Ulustrates examination of various regions of the HTATIP gene for polymorphic sites.
- the foUowing target regions of the HTATIP gene were ampHfied using 'taUed' PCR primers, each of which includes a universal sequence forming a noncomplementary 'tail' attached to the 5' end of each unique sequence in the PCR primer pairs.
- the universal 'tail' sequence for the forward PCR primers comprises the sequence 5 '-TGTAAAACGACGGCCAGT-3' (SEQ ID NO:99) and the universal 'tan' sequence for the reverse PCR primers comprises the sequence 5'- AGGAAACAGCTATGACCAT-3 ' (SEQ ID NO: 100).
- the nucleotide positions of the first and last nucleotide of the forward and reverse primers for each region ampHfied are presented below and correspond to positions in SEQ ID NO:l ( Figure 1).
- Amplification profile 97°C - 2min. 1 cycle
- the PCR products were purified using a Whatman/Polyfiltronics 100 ⁇ l 384 weU unifilter plate essentiaUy according to the manufacturers protocol.
- the purified DNA was eluted in 50 ⁇ l of distilled water.
- Sequencing reactions were set up using Applied Biosystems Big Dye Terminator chemistry essentiaUy according to the manufacturers protocol.
- the purified PCR products were sequenced in both directions using the appropriate universal 'taU' sequence as a primer. Reaction products were purified by isopropanol precipitation, and run on an Applied Biosystems 3700 DNA Analyzer.
- EXAMPLE 2 This example Ulustrates analysis of the HTATIP polymorphisms identified in the Index Repository for human genotypes and haplotypes.
- the different genotypes containing these polymorphisms that were observed in unrelated members of the reference population are shown in Table 3 below, with the haplotype pair indicating the cornbination of haplotypes determined for the individual using the haplotype derivation protocol described below.
- Table 3 homozygous positions are indicated by one nucleotide and heterozygous positions are indicated by two nucleotides. Missing nucleotides in any given genotype in Table 3 were inferred based on linkage disequilibrium and or MendeHan inheritance.
- haplotype pairs shown in Table 3 were estimated from the unphased genotypes using a computer-implemented extension of Clark' s algorithm (Clark, A.G. 1990 Mol Bio Evol 7, 111 - 122) for assigning haplotypes to unrelated individuals in a population sample, as described in Clark' s algorithm (Clark, A.G. 1990 Mol Bio Evol 7, 111 - 122) for assigning haplotypes to unrelated individuals in a population sample, as described in
- haplotypes are assigned directly from individuals who are homozygous at aU sites or heterozygous at no more than one of the variable sites.
- haplotypes This Hst of haplotypes is then used to deconvolute the unphased genotypes in the remaining (multiply heterozygous) individuals.
- the list of haplotypes was augmented with haplotypes obtained from two famiUes (one three-generation Caucasian famUy and one two-generation
- a HTATIP isogene defined by a fuU-haplotype shown in Table 4 below comprises the regions of the SEQ ID NOS indicated in Table 4, with their corresponding set of polymorphic locations and identities, which are also set forth in Table 4.
- Region examined represents the nucleotide positions defining the start and stop positions within SEQ ID NO:l of the regions sequenced;
- SEQ ID NO: 1 refers to Figure 1 , with the two alternative allehc variants of each polymorphic site indicated by the appropriate nucleotide symbol.
- SEQ ID NO : 101 is a modified version of SEQ ID NO:
- SEQ ID NO: 101 that shows the context sequence of each of PS 1 -PS 19 in a uniform format to facUitate electronic searching of the HTATIP haplotypes.
- SEQ ID NO: 101 contains a block of
- each polymorphic site is separated by genomic sequence whose composition is defined elsewhere herein.
- Table 5 shows the percent of chromosomes characterized by a given HTATIP haplotype for aU unrelated individuals in the Index Repository for which haplotype data was obtained.
- Tables 5 and 6 the "Total" column shows this frequency data for all of these unrelated individuals, while the other columns show the frequency data for these unrelated individuals categorized according to their self-identified ethnogeographic origin.
- HAP1 HAP2 Total CA AF AS HL AM
- the size and composition of the Index Repository were chosen to represent the genetic diversity across and within four major population groups comprising the general United States population.
- this repository contains approximately equal sample sizes of African-descent, Asian-American, European-American, and Hispanic-Latino population groups. Almost aU individuals representing each group had aU four grandparents with the same ethnogeographic background.
- the number of unrelated individuals in the Index Repository provides a sample size that is sufficient to detect SNPs and haplotypes that occur in the general population with high statistical certainty. For instance, a haplotype that occurs with a frequency of 5% in the general population has a probabifity higher than 99.9% of being observed in a sample of 80 individuals from the general population.
- a haplotype that occurs with a frequency of 10% in a specific population group has a 99% probabiHty of being observed in a sample of 20 individuals from that population group.
- the size and composition of the Index Repository means that the relative frequencies determined therein for the haplotypes and haplotype pairs of the HTATIP gene are likely to be similar to the relative frequencies of these HTATIP haplotypes and haplotype pairs in the general U.S. population and in the four population groups represented in the Index Repository.
- the genetic diversity observed for the three Native Americans is presented because it is of scientific interest, but due to the small sample size it lacks statistical significance.
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