Variants in the FTO and CDKAL1 loci have recessive effects on risk of obesity and type 2 diabetes, respectively
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Abstract
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 × 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 × 10(-7)). For type 2 diabetes, we detected a recessive effect (p DOMDEV = 5 × 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.
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Analyses aimed at genes which influence disease in a non-additive fashion have identified novel candidate genes for obesity and type 2 diabetes.
“Analyses aimed at genes which influence disease in a non-additive fashion have identified novel candidate genes for obesity and type 2 diabetes [267]”
From Genetic architecture of Alzheimer's disease (2020) · cites this paper as [267]
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- Authors
- The GIANT consortium, Wood, A. R., Tyrrell, J., Beaumont, R., Jones, S. E., Tuke, M. A., Ruth, K. S., Yaghootkar, H., Freathy, R. M., Murray, A., Frayling, T. M., & Weedon, M. N.
- Affiliations
- University of Exeter (GB)
- Corresponding author
- Wood, Andrew R.
- ORCID
- Venue
- Diabetologia
- Published
- 2016-03-10
- Volume
- 59
- Issue
- 6
- Pages
- 1214-1221
- ISSN
- 0012-186X (ISSN-L)
- 1432-0428
- PMC
- PMC4869698
- OpenAlex
- W2293647101
- Cited by
- 74
- References
- 24
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 8 · 2023: 13 · 2022: 9 · 2021: 9 · 2020: 8 · 2019: 7 · 2018: 7 · 2017: 4 · 2016: 3
- FWCI
- 5.66
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Diabetologia (publishedVersion, cc-by)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Open Research Exeter (University of Exeter) (publishedVersion)
- Figshare (submittedVersion, cc-by)
- Figshare (submittedVersion)
- Site cant be reached (submittedVersion, cc-by)
- Royal Devon and Exeter Research Repository (Royal Devon and Exeter) (submittedVersion, cc-by)
- Funders
- Wellcome Trust (WT097835MF)
- Medical Research Council (MR/M005070/1)
- European Research Council (323195: SZ-245 50371-GLUCOSEGENES-FP7-IDEAS-ERC)
- Royal Society (104150/Z/14/Z)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Physical Performance
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Mapping and Diversity in Plants and Animals
- Keywords
- type 2 diabetes, FTO, dominance deviation, non-additive genetic effects, body mass index, genetic risk variants, missing heritability, gene-environment interaction, heterozygous carriers, homozygous carriers
- MeSH terms
- Alpha-Ketoglutarate-Dependent Dioxygenase FTO, Alleles, Diabetes Mellitus, Type 2, Genotype, Humans, Obesity, tRNA Methyltransferases, Models, Statistical, Body Mass Index, Genetic Predisposition to Disease, Polymorphism, Single Nucleotide, Principal Component Analysis, Genome-Wide Association Study
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