De Neve, Jan-Emmanuel and The Social Science Genetics Association Consortium, (2014) Replicability and Robustness of Genome-Wide-Association Studies for Behavioral Traits. Psychological Science, 25 (11). pp. 1975-1986.
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 behavioural 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.
|Keywords:||behavior genetics, educational attainment, individual differences, genome-wide association study, population stratification|
|Subject(s):||Strategy; Entrepreneurship & Global business|
|Centre:||Faculty of Strategy, Entrepreneurship and International Business|
|Date Deposited:||11 Aug 2015 11:35|
|Last Modified:||23 Oct 2015 14:08|
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