Variants in the FTO and CDKAL1 loci have recessive effects on risk of obesity and type 2 diabetes, respectively

被引:56
作者
Wood, Andrew R. [1 ]
Tyrrell, Jessica [1 ]
Beaumont, Robin [1 ]
Jones, Samuel E. [1 ]
Tuke, Marcus A. [1 ]
Ruth, Katherine S. [1 ]
Yaghootkar, Hanieh [1 ]
Freathy, Rachel M. [1 ]
Murray, Anna [1 ]
Frayling, Timothy M. [1 ]
Weedon, Michael N. [1 ]
机构
[1] Univ Exeter, Sch Med, Royal Devon & Exeter Hosp, Inst Biomed & Clin Sci,Genet Complex Traits, Barrack Rd, Exeter EX2 5DW, Devon, England
基金
欧洲研究理事会; 英国惠康基金; 英国医学研究理事会;
关键词
Association analysis; BMI; CDKAL1; FTO; Genetics; Non-additive effects; Type; 2; diabetes; UK Biobank; GENOME-WIDE ASSOCIATION; BODY-MASS INDEX; SUSCEPTIBILITY LOCI; INSIGHTS;
D O I
10.1007/s00125-016-3908-5
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Aims/hypothesis Genome-wide association (GWA) studies have identified hundreds of common genetic variants associated with obesity and type 2 diabetes. These studies have usually focused on additive association tests. Identifying deviations from additivity may provide new biological insights and explain some of the missing heritability for these diseases. Methods We performed a GWA study using a dominance deviation model for BMI, obesity (29,925 cases) and type 2 diabetes (4,040 cases) in 120,286 individuals of British ancestry from the UK Biobank study. We also investigated whether single nucleotide polymorphisms previously shown to be associated with these traits showed any enrichment for departures from additivity. Results Known obesity-associated variants in FTO showed strong evidence of deviation from additivity (p(DOMDEV) = 3 x 10(-5)) through a recessive effect of the allele associated with higher BMI. The average BMI of individuals carrying zero, one or two BMI-raising alleles was 27.27 (95% CI 27.22, 27.31) kg/m(2), 27.54 (95% CI 27.50, 27.58) kg/m(2) and 28.07 (95% CI 28.00, 28.14) kg/m(2), respectively. A similar effect was observed in 105,643 individuals from the GIANT Consortium (p(DOMDEV) = 0.003; meta-analysis p(DOMDEV) = 1 x 10(-7)). For type 2 diabetes, we detected a recessive effect (p(DOMDEV) = 5 x 10(-4)) at CDKAL1. Relative to homozygous non-risk allele carriers, homozygous risk allele carriers had an OR of 1.48 (95% CI 1.32, 1.65), while the heterozygous group had an OR of 1.06 (95% CI 0.99, 1.14), a result consistent with that of a previous study. We did not identify any novel associations at genome-wide significance. Conclusions/interpretation Although we found no evidence of widespread non-additive genetic effects contributing to obesity and type 2 diabetes risk, we did find robust examples of recessive effects at the FTO and CDKAL1 loci. Access to research materials Summary statistics are available at www.t2diabetesgenes.org and by request (a.r.wood@exeter.ac.uk). All underlying data are available on application from the UK Biobank.
引用
收藏
页码:1214 / 1221
页数:8
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