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Genome-wide association analysis of metabolic traits in a birth cohort from a founder population

Abstract

Genome-wide association studies (GWAS) of longitudinal birth cohorts enable joint investigation of environmental and genetic influences on complex traits. We report GWAS results for nine quantitative metabolic traits (triglycerides, high-density lipoprotein, low-density lipoprotein, glucose, insulin, C-reactive protein, body mass index, and systolic and diastolic blood pressure) in the Northern Finland Birth Cohort 1966 (NFBC1966), drawn from the most genetically isolated Finnish regions. We replicate most previously reported associations for these traits and identify nine new associations, several of which highlight genes with metabolic functions: high-density lipoprotein with NR1H3 (LXRA), low-density lipoprotein with AR and FADS1-FADS2, glucose with MTNR1B, and insulin with PANK1. Two of these new associations emerged after adjustment of results for body mass index. Gene–environment interaction analyses suggested additional associations, which will require validation in larger samples. The currently identified loci, together with quantified environmental exposures, explain little of the trait variation in NFBC1966. The association observed between low-density lipoprotein and an infrequent variant in AR suggests the potential of such a cohort for identifying associations with both common, low-impact and rarer, high-impact quantitative trait loci.

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Figure 1: Linguistic/geographic groups of Northern Finland and their genetic signature.
Figure 2: Quantile-quantile plots of the tails of the P-value distribution for the nine traits.
Figure 3: Association P values for genotyped SNPs for the nine traits.
Figure 4: Association signal in the nine newly identified loci.
Figure 5: Graphical representation of the proportion of explained variance for each of the five traits for which genetic loci have been identified.

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Acknowledgements

We acknowledge the support of US National Heart, Lung, and Blood Institute grant HL087679 through the STAMPEED program, grants MH083268, GM053275-14 and U54 RR020278 from the US National Institutes of Health, grant DMS-0239427 from the National Science Foundation, the Medical Research Council of the UK, EURO-BLCS, QLG1-CT-2000-01643 and the European Community's Seventh Framework Programme (FP7/2007-2013), ENGAGE project and grant agreement HEALTH-F4-2007-201413. The authors would like to thank the Center of Excellence in Common Disease Genetics of the Academy of Finland and Nordic Center of Excellence in Disease Genetics, the Sydantautisaatio (Finnish Foundation of Heart Diseases), the Broad Genotyping Center, D. Mirel, H. Hobbs, J. DeYoung, P. Rantakallio, M. Koiranen and M. Isohanni for advice and assistance.

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Contributions

The study was designed by L.P., N.B.F., C.S., M.I.M., M.J.D., P.E., M.-R.J. and S.K.S. Information on traits was collected and maintained by M.-R.J., A.-L.H., A.P., A.R. and J.L. Genotyping was supervised by S.G. Database support was provided by H.T., U.S. and M.K. Statistical analysis was performed by C.S., S.K.S., A.C., C.G.J., J.B., N.A.Z., and M.J.D. S.R., E.J. and T.V. contributed to the analysis of the Finnish genetic signature. L.C., C.H. and P.E. participated in discussion of results. The manuscript was written by C.S., S.K.S., N.B.F. and L.P. All authors reviewed the manuscript.

Corresponding authors

Correspondence to Nelson B Freimer or Leena Peltonen.

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Sabatti, C., Service, S., Hartikainen, AL. et al. Genome-wide association analysis of metabolic traits in a birth cohort from a founder population. Nat Genet 41, 35–46 (2009). https://doi.org/10.1038/ng.271

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