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    A genome-wide analysis of putative functional and exonic variation associated with extremely high intelligence

    Spain, S.L. and Pedroso, I. and Kadeva, N. and Miller, M.B. and Iacono, W.G. and McGue, M. and Stergiakouli, E. and Smith, G.D. and Putallaz, M. and Lubinski, D. and Meaburn, Emma L. and Plomin, R. and Simpson, M.A. (2015) A genome-wide analysis of putative functional and exonic variation associated with extremely high intelligence. Molecular Psychiatry 21 , pp. 1145-1151. ISSN 1359-4184.

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    Abstract

    Although individual differences in intelligence (general cognitive ability) are highly heritable, molecular genetic analyses to date have had limited success in identifying specific loci responsible for its heritability. This study is the first to investigate exome variation in individuals of extremely high intelligence. Under the quantitative genetic model, sampling from the high extreme of the distribution should provide increased power to detect associations. We therefore performed a case–control association analysis with 1409 individuals drawn from the top 0.0003 (IQ >170) of the population distribution of intelligence and 3253 unselected population-based controls. Our analysis focused on putative functional exonic variants assayed on the Illumina HumanExome BeadChip. We did not observe any individual protein-altering variants that are reproducibly associated with extremely high intelligence and within the entire distribution of intelligence. Moreover, no significant associations were found for multiple rare alleles within individual genes. However, analyses using genome-wide similarity between unrelated individuals (genome-wide complex trait analysis) indicate that the genotyped functional protein-altering variation yields a heritability estimate of 17.4% (s.e. 1.7%) based on a liability model. In addition, investigation of nominally significant associations revealed fewer rare alleles associated with extremely high intelligence than would be expected under the null hypothesis. This observation is consistent with the hypothesis that rare functional alleles are more frequently detrimental than beneficial to intelligence.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Science > Psychological Sciences
    Research Centre: Educational Neuroscience, Centre for, Brain and Cognitive Development, Centre for (CBCD)
    Depositing User: Administrator
    Date Deposited: 05 Aug 2015 17:06
    Last Modified: 09 Dec 2016 11:16
    URI: http://eprints.bbk.ac.uk/id/eprint/12725

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