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Contribution of common and rare variants to bipolar disorder susceptibility in extended pedigrees from population isolates
Jae Hoon Sul,
Susan K Service,
Alden Y Huang,
Terri M Teshiba,
Anil P. S. Ori,
Loes M. Olde Loohuis,
Scott C Fears,
Maria C Lopez,
Claudia P Montoya,
Javier I Escobar,
Rita M. Cantor,
Roel A. Ophoff,
Carrie E. Bearden,
Posted 08 Jul 2018
bioRxiv DOI: 10.1101/363267
Posted 08 Jul 2018
Current evidence from case/control studies indicates that genetic risk for psychiatric disorders derives primarily from numerous common variants, each with a small phenotypic impact. The literature describing apparent segregation of bipolar disorder (BP) in numerous multigenerational pedigrees suggests that, in such families, large-effect inherited variants might play a greater role. To evaluate this hypothesis, we conducted genetic analyses in 26 Colombian (CO) and Costa Rican (CR) pedigrees ascertained for BP1, the most severe and heritable form of BP. In these pedigrees, we performed microarray SNP genotyping of 856 individuals and high-coverage whole-genome sequencing of 454 individuals. Compared to their unaffected relatives, BP1 individuals had higher polygenic risk scores estimated from SNPs associated with BP discovered in independent genome-wide association studies, and also displayed a higher burden of rare deleterious single nucleotide variants (SNVs) and rare copy number variants (CNVs) in genes likely to be relevant to BP1. Parametric and non-parametric linkage analyses identified 15 BP1 linkage peaks, encompassing about 100 genes, although we observed no significant segregation pattern for any particular rare SNVs and CNVs. These results suggest that even in extended pedigrees, genetic risk for BP appears to derive mainly from small to moderate effect rare and common variants.
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