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  • Rietveld, CA, et al. (författare)
  • Replicability and robustness of genome-wide-association studies for behavioral traits
  • 2014
  • Ingår i: Psychological science. - : SAGE Publications. - 1467-9280 .- 0956-7976. ; 25:11, s. 1975-1986
  • Tidskriftsartikel (refereegranskat)abstract
    • A recent genome-wide-association study of educational attainment identified three single-nucleotide polymorphisms (SNPs) whose associations, despite their small effect sizes (each R2 ≈ 0.02%), reached genome-wide significance ( p < 5 × 10−8) in a large discovery sample and were replicated in an independent sample ( p < .05). The study also reported associations between educational attainment and indices of SNPs called “polygenic scores.” In three studies, we evaluated the robustness of these findings. Study 1 showed that the associations with all three SNPs were replicated in another large ( N = 34,428) independent sample. We also found that the scores remained predictive ( R2 ≈ 2%) in regressions with stringent controls for stratification (Study 2) and in new within-family analyses (Study 3). Our results show that large and therefore well-powered genome-wide-association studies can identify replicable genetic associations with behavioral traits. The small effect sizes of individual SNPs are likely to be a major contributing factor explaining the striking contrast between our results and the disappointing replication record of most candidate-gene studies.
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