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Contrasting genetic architectures of schizophrenia and other complex diseases using fast variance-components analysis

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Schizophrenia Working Group of Psychiatric Genomics Consortium
<mark>Journal publication date</mark>12/2015
<mark>Journal</mark>Nature Genetics
Issue number12
Number of pages8
Pages (from-to)1385-1392
Publication StatusPublished
Early online date2/11/15
<mark>Original language</mark>English


Heritability analyses of genome-wide association study (GWAS) cohorts have yielded important insights into complex disease architecture, and increasing sample sizes hold the promise of further discoveries. Here we analyze the genetic architectures of schizophrenia in 49,806 samples from the PGC and nine complex diseases in 54,734 samples from the GERA cohort. For schizophrenia, we infer an overwhelmingly polygenic disease architecture in which ≥71% of 1-Mb genomic regions harbor ≥1 variant influencing schizophrenia risk. We also observe significant enrichment of heritability in GC-rich regions and in higher-frequency SNPs for both schizophrenia and GERA diseases. In bivariate analyses, we observe significant genetic correlations (ranging from 0.18 to 0.85) for several pairs of GERA diseases; genetic correlations were on average 1.3 tunes stronger than the correlations of overall disease liabilities. To accomplish these analyses, we developed a fast algorithm for multicomponent, multi-trait variance-components analysis that overcomes prior computational barriers that made such analyses intractable at this scale.