Across-nation differences in the mean values for complex traits are common1,2,3,4,5,6,7,8, but the reasons for these differences are unknown. Here we find that many independent loci contribute to population genetic differences in height and body mass index (BMI) in 9,416 individuals across 14 European countries. Using discovery data on over 250,000 individuals and unbiased effect size estimates from 17,500 sibling pairs, we estimate that 24% (95% credible interval (CI) = 9%, 41%) and 8% (95% CI = 4%, 16%) of the captured additive genetic variance for height and BMI, respectively, reflect population genetic differences. Population genetic divergence differed significantly from that in a null model (height, P < 3.94 × 10−8; BMI, P < 5.95 × 10−4), and we find an among-population genetic correlation for tall and slender individuals (r = −0.80, 95% CI = −0.95, −0.60), consistent with correlated selection for both phenotypes. Observed differences in height among populations reflected the predicted genetic means (r = 0.51; P < 0.001), but environmental differences across Europe masked genetic differentiation for BMI (P < 0.58).
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We thank the reviewers for their very helpful and insightful comments that greatly improved the manuscript. We also thank B. Hill and O. Ovaskainen for useful discussions. The University of Queensland group is supported by the Australian National Health and Medical Research Council (NHMRC; grants 1078037, 1048853 and 1050218). J.E.P. is supported by Australian Research Council grant DE130100691. J.Y. is supported by a Charles and Sylvia Viertel Senior Medical Research Fellowship and by NHMRC grant 1052684. We thank our colleagues at the Centre for Neurogenetics and Statistical Genomics for comments and suggestions. We are grateful to the twins and their families for their generous participation in the full-sibling family data set, which includes data from many cohorts and received support from many funding bodies. TWINGENE was supported by the Swedish Research Council (M-2005-1112), GenomEUtwin (EU/QLRT-2001-01254 and QLG2-CT-2002-01254), US National Institutes of Health (NIH) grant DK U01-066134, the Swedish Foundation for Strategic Research (SSF), and the Heart and Lung Foundation (20070481). For the Netherlands Twin Register (NTR), funding was obtained from the Netherlands Organization for Scientific Research (NWO; MagW/ZonMW grants 904-61-090, 985-10-002, 904-61-193, 480-04-004, 400-05-717, Addiction-31160008, Middelgroot-11-09-032 and Spinozapremie 56-464-14192), the Center for Medical Systems Biology (CSMB; NWO Genomics), NBIC/BioAssist/RK(2008.024), Biobanking and Biomolecular Resources Research Infrastructure (BBMRI-NL; 184.021.007), the VU University's Institute for Health and Care Research (EMGO+) and Neuroscience Campus Amsterdam (NCA), the European Science Foundation (ESF; EU/QLRT-2001-01254), the European Community's Seventh Framework Programme (FP7/2007-2013) under the ENGAGE project grant agreement (HEALTH-F4-2007-201413), the European Research Council (ERC Advanced; 230374), the Rutgers University Cell and DNA Repository (National Institute for Mental Health (NIMH), U24-MH068457-06), the Avera Institute (Sioux Falls, South Dakota, USA) and the US NIH (R01-D0042157-01A, Grand Opportunity grants 1RC2-MH089951-01 and 1RC2-MH089995-01). Part of the genotyping and analyses were funded by the Genetic Association Information Network (GAIN) of the Foundation for the National Institutes of Health. The TwinsUK study was funded by the Wellcome Trust and the European Community's Seventh Framework Programme (FP7/2007-2013) under the ENGAGE project grant agreement (HEALTH-F4-2007-201413). TwinsUK also receives support from the UK Department of Health via the National Institute for Health Research (NIHR) comprehensive Biomedical Research Centre award to Guy's and St Thomas' National Health Service (NHS) Foundation Trust in partnership with King's College London. T.D.S. is the holder of an ERC Advanced Principal Investigator award. Genotyping for the TwinsUK study was performed by the Wellcome Trust Sanger Institute, with the support of the National Eye Institute via a US NIH/Center for Inherited Disease Research (CIDR) genotyping project. The Framingham Heart Study is conducted and supported by the National Heart, Lung, and Blood Institute (NHLBI) in collaboration with Boston University (contract N01-HC-25195). This manuscript was not prepared in collaboration with investigators of the Framingham Heart Study and does not necessarily reflect the opinions or views of the Framingham Heart Study, Boston University or NHLBI. Funding for SHARe Affymetrix genotyping was provided by NHLBI contract N02-HL-64278. Funding for SHARe Illumina genotyping was provided under an agreement between Illumina and Boston University. The QIMR researchers acknowledge funding from the Australian NHMRC (grants 241944, 389875, 389891, 389892, 389938, 442915, 442981, 496739, 496688 and 552485) and the US NIH (grants AA07535, AA10248, AA014041, AA13320, AA13321, AA13326 and DA12854). We are grateful to M. Gill (Trinity College Dublin) and K. Nicodemus (University of Edinburgh) for access to the ISC–Trinity College Dublin cohort, which was supported by the Wellcome Trust and the Health Research Board, Ireland. Access to the Bulgarian cohort data was kindly facilitated by G. Kirov and V. Excott-Price. For the Danish cohort, the Danish Scientific Committees and the Danish Data Protection Agency approved the study and all the patients gave written informed consent before inclusion in the project. The National Institute on Aging (NIA) provided funding for the Health and Retirement Study (HRS; U01-AG09740). The HRS is performed at the Institute for Social Research at the University of Michigan. This manuscript was not prepared in collaboration with investigators of the HRS and does not necessarily reflect the opinions or views of the HRS, University of Michigan or NIA. The Netherlands genotype samples were part of Project MinE, which was supported by the ALS Foundation Netherlands. Research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/2007-2013).
Integrated supplementary information
Supplementary Figures 1–15, Supplementary Tables 1 and 2, and Supplementary Note.