This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Since 1988 the NIMH Genetics Initiative has supported a national resource for the study of bipolar disorder (BP). By 1997 153 multiplex families were assessed, providing cell lines, DNA, and anonymized clinical data. This is now a publicly available resource and analytic results have been published. A second effort commenced in 1998 to ascertain 500 new BP sib pairs; this goal has been exceeded with 523 additional BPI sib pairs ascertained, interviewed, and a DNA sample collected. A genome wide scan has been completed at the Center for Inherited Disease Research (CIDR) on 237 sib pair families; the remaining 309 families will be genotyped by CIDR during 2003. This resource, the largest of its kind, has revealed evidence for area of linkage on chromosomes 6q and 17q. It has also provided confirmation of a locus on chromosome 22q and support for areas on 1p, 10p, 16p, 13q, and 21q. Accumulating linkage data has implicated other chormosomal regions. We propose an extension of the national genetic resource to include a sample of 5000 unrelated BP probands and 2000 parents for case-control and family-based association resource. Probands and parents will be ascertained and assessed at eleven sites (the ten sites previously participating plus Howard University, which will provide additional African-American probands). This sample will be a national resource for fine scale linkage disequilibrium mappping within regions of linkage, as well as condidate gene association studies. Parental DNAs in a subsample will allow additional control for ethnic stratification. Bioinformatics techniques will be developed and supported for genomic analysis of condidate regions, to assist selection of SNPs and other polymorphic markers and primer design. The genotyping will be coordinated across 8 labs with an informed step-wise approach, beginning with standard micro-satellite mapping of the current set of 699 pedigrees, followed by contract genotyping of SNPs in an industrial laboratory, and continuing with follow-up genotyping of regions and sequencing of associated genes in laboratories at the individual sites. SNP typing of the larger case-control sample will occur primarily in the final year of the collaborative study. Analysis of the existing sib pair families plus this large set of cases and controls should permit the confirmation of several vulnerability genes during this grant period.
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