Polymorphisms at the G72/G30 gene locus, on 13q33, are associated with bipolar disorder in two independent pedigree series.

TitlePolymorphisms at the G72/G30 gene locus, on 13q33, are associated with bipolar disorder in two independent pedigree series.
Publication TypeJournal Article
Year of Publication2003
AuthorsHattori, E, Liu, C, Badner, JA, Bonner, TI, Christian, SL, Maheshwari, M, Detera-Wadleigh, SD, Gibbs, RA, Gershon, ES
JournalAm J Hum Genet
Date Published2003 May
KeywordsAlternative Splicing, Bipolar Disorder, Carrier Proteins, Chromosomes, Human, Pair 13, DNA, Complementary, Gene Frequency, Genes, Genetic Linkage, Genetic Predisposition to Disease, Haplotypes, Humans, Intracellular Signaling Peptides and Proteins, Likelihood Functions, Linkage Disequilibrium, Molecular Sequence Data, Pedigree, Polymorphism, Single Nucleotide, Sequence Analysis, DNA

Linkage evidence suggests that chromosome 13 (13q32-33) contains susceptibility genes for both bipolar disorder and schizophrenia. Recently, genes called "G72" and "G30" were identified, and polymorphisms of these overlapping genes were reported to be associated with schizophrenia. We studied two series of pedigrees with bipolar disorder: the Clinical Neurogenetics (CNG) pedigrees (in which linkage to illness had been previously reported at 13q32-33), with 83 samples from 22 multiplex families, and the National Institute of Mental Health (NIMH) Genetics Initiative pedigrees, with 474 samples from 152 families. Sixteen single-nucleotide polymorphisms (SNPs) were genotyped at and around the G72/G30 locus, which covered a 157-kb region encompassing the entire complementary DNA sequences of G72 and G30. We performed transmission/disequilibrium testing (TDT) and haplotype analysis, since a linkage-disequilibrium block was present at this gene locus. In the CNG and NIMH data sets, the results of global TDT of the entire haplotype set were significant and consistent (P=.0004 and P=.008, respectively). In the CNG series, the associated genotypes divided the families into those with linkage and those without linkage (partitioned by the linkage evidence). Analysis of the decay of haplotype sharing gave a location estimate that included G72/G30 in its 95% confidence interval. Although statistically significant association was not detected for individual SNPs in the NIMH data set, the same haplotype was consistently overtransmitted in both series. These data suggest that a susceptibility variant for bipolar illness exists in the vicinity of the G72/G30 genes. Taken together with the earlier report, this is the first demonstration of a novel gene(s), discovered through a positional approach, independently associated with both bipolar illness and schizophrenia.

Alternate JournalAm J Hum Genet
PubMed ID12647258
PubMed Central IDPMC1180266
Grant ListR01 MH65560-01 / MH / NIMH NIH HHS / United States
R01 MH059535 / MH / NIMH NIH HHS / United States
R01 MH59535 / MH / NIMH NIH HHS / United States
R01 MH065560 / MH / NIMH NIH HHS / United States
U01 MH46280 / MH / NIMH NIH HHS / United States
U01 H46282 / / PHS HHS / United States
U01 H46274 / / PHS HHS / United States
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