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An FTO variant is associated with Type 2 diabetes in South Asian populations after accounting for body mass index and waist circumference

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Rees, Simon D., Islam, M., Hydrie, M. Z. I., Chaudhary, B., Bellary, Srikanth, Hashmi, Shiraz, O'Hare, J. Paul, Kumar, Sudhesh, Sanghera, D. K., Chaturvedi, N., Barnett, A. H., Shera, A. S., Weedon, Michael N., Basit, A., Frayling, Timothy M., Kelly, M. Ann and Jafar, T. H. (2011) An FTO variant is associated with Type 2 diabetes in South Asian populations after accounting for body mass index and waist circumference. Diabetic Medicine, Volume 28 (Number 6). pp. 673-680. doi:10.1111/j.1464-5491.2011.03257.x ISSN 0742-3071.

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Official URL: http://dx.doi.org/10.1111/j.1464-5491.2011.03257.x

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Abstract

A common variant, rs9939609, in the FTO (fat mass and obesity) gene is associated with adiposity in Europeans, explaining its relationship with diabetes. However, data are inconsistent in South Asians. Our aim was to investigate the association of the FTO rs9939609 variant with obesity, obesity-related traits and Type 2 diabetes in South Asian individuals, and to use meta-analyses to attempt to clarify to what extent BMI influences the association of FTO variants with diabetes in South Asians.
Methods

We analysed rs9939609 in two studies of Pakistani individuals: 1666 adults aged >= 40 years from the Karachi population-based Control of Blood Pressure and Risk Attenuation (COBRA) study and 2745 individuals of Punjabi ancestry who were part of a Type 2 diabetes case-control study (UK Asian Diabetes Study/Diabetes Genetics in Pakistan; UKADS/DGP). The main outcomes were BMI, waist circumference and diabetes. Regression analyses were performed to determine associations between FTO alleles and outcomes. Summary estimates were combined in a meta-analysis of 8091 South Asian individuals (3919 patients with Type 2 diabetes and 4172 control subjects), including those from two previous studies.
Results

In the 4411 Pakistani individuals from this study, the age-, sex- and diabetes-adjusted association of FTO variant rs9939609 with BMI was 0.45 (95% CI 0.24-0.67) kg/m2 per A-allele (P = 3.0 x 10-5) and with waist circumference was 0.88 (95% CI 0.36-1.41) cm per A-allele (P = 0.001). The A-allele (30% frequency) was also significantly associated with Type 2 diabetes [per A-allele odds ratio (95% CI) 1.18 (1.07-1.30); P = 0.0009]. A meta-analysis of four South Asian studies with 8091 subjects showed that the FTO A-allele predisposes to Type 2 diabetes [1.22 (95% CI 1.14-1.31); P = 1.07 x 10-8] even after adjusting for BMI [1.18 (95% CI 1.10-1.27); P = 1.02 x 10-5] or waist circumference [1.18 (95% CI 1.10-1.27); P = 3.97 x 10-5].
Conclusions

The strong association between FTO genotype and BMI and waist circumference in South Asians is similar to that observed in Europeans. In contrast, the strong association of FTO genotype with diabetes is only partly accounted for by BMI.

Item Type: Journal Article
Subjects: R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
R Medicine > RC Internal medicine
Divisions: Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School
Library of Congress Subject Headings (LCSH): Non-insulin-dependent diabetes -- Risk factors, Non-insulin-dependent diabetes -- Genetic aspects, Non-insulin-dependent diabetes -- Susceptibility -- Research, South Asians -- Health and hygiene -- Research, Non-insulin-dependent diabetes -- South Asia, Body mass index, Obesity -- Genetic aspects
Journal or Publication Title: Diabetic Medicine
Publisher: Blackwell
ISSN: 0742-3071
Official Date: 2011
Dates:
DateEvent
2011Published
Volume: Volume 28
Number: Number 6
Page Range: pp. 673-680
DOI: 10.1111/j.1464-5491.2011.03257.x
Status: Peer Reviewed
Publication Status: Published
Funder: Wellcome Trust (London, England), Diabetes UK, Eli Lilly and Company, Pfizer Inc., Sanofi Aventis (Firm), Servier Laboratories UK, Merck Sharp & Dohme, Takeda UK (Firm), Roche, Daiichi-Sankyo UK, Boehringer Ingelheim Pharmaceuticals, Novo Nordisk, Bristol-Myers Squibb Company, Solvay Healthcare Ltd., Assurance Medical Society UK, Fogarty International Center, National Institute of Diabetes and Digestive and Kidney Diseases (U.S.) (NIDDKD)
Grant number: 080747/Z/06/Z (WT), 07/0003512, 09/0003926 (DUK), KO1 TW006087 (FIC), R01 DK082766 (NIDDKD)

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