Pedigree- and SNP-associated genetics and recent environment are the major contributors to anthropometric and cardiometabolic trait variation

Gibson, G. et al. (2016) Pedigree- and SNP-associated genetics and recent environment are the major contributors to anthropometric and cardiometabolic trait variation. PLoS Genetics, 12(2), e1005804. (doi: 10.1371/journal.pgen.1005804) (PMID:26836320) (PMCID:PMC4737500)

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Genome-wide association studies have successfully identified thousands of loci for a range of human complex traits and diseases. The proportion of phenotypic variance explained by significant associations is, however, limited. Given the same dense SNP panels, mixed model analyses capture a greater proportion of phenotypic variance than single SNP analyses but the total is generally still less than the genetic variance estimated from pedigree studies. Combining information from pedigree relationships and SNPs, we examined 16 complex anthropometric and cardiometabolic traits in a Scottish family-based cohort comprising up to 20,000 individuals genotyped for ~520,000 common autosomal SNPs. The inclusion of related individuals provides the opportunity to also estimate the genetic variance associated with pedigree as well as the effects of common family environment. Trait variation was partitioned into SNP-associated and pedigree-associated genetic variation, shared nuclear family environment, shared couple (partner) environment and shared full-sibling environment. Results demonstrate that trait heritabilities vary widely but, on average across traits, SNP-associated and pedigree-associated genetic effects each explain around half the genetic variance. For most traits the recently-shared environment of couples is also significant, accounting for ~11% of the phenotypic variance on average. On the other hand, the environment shared largely in the past by members of a nuclear family or by full-siblings, has a more limited impact. Our findings point to appropriate models to use in future studies as pedigree-associated genetic effects and couple environmental effects have seldom been taken into account in genotype-based analyses. Appropriate description of the trait variation could help understand causes of intra-individual variation and in the detection of contributing loci and environmental factors.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Padmanabhan, Professor Sandosh
Authors: Gibson, G., Xia, C., Amador, C., Huffman, J., Trochet, H., Campbell, A., Porteous, D., Generation Scotland, , Hastie, N. D., Hayward, C., Vitart, V., Navarro, P., and Haley, C. S.
College/School:College of Medical Veterinary and Life Sciences > School of Cardiovascular & Metabolic Health
Journal Name:PLoS Genetics
Publisher:Public Library of Science
ISSN (Online):1553-7404
Copyright Holders:Copyright © 2016 Xia et al.
First Published:First published in PLoS Genetics 12(2):e1005804
Publisher Policy:Reproduced under a Creative Commons License

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