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Common variation in the FTO gene alters diabetes-related metabolic traits to the extent expected given its effect on BMI.
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Timpson Nj,
Nicholas J. Timpson ,
Lawlor Da,
Debbie A. Lawlor,
Anneli Pouta,
Yoav Ben-Shlomo ,
Aimo Ruokonen,
Shah Ebrahim,
Beverley Shields,
Eleftheria Zeggini ,
Weedon Mn,
Michael N. Weedon ,
Lindgren Cm,
Cecilia M. Lindgren
and other authors.
Abstract
OBJECTIVE: Common variation in the FTO gene is associated with BMI and type 2 diabetes. Increased BMI is associated with diabetes risk factors, including raised insulin, glucose, and triglycerides. We aimed to test whether FTO genotype is associated with variation in these metabolic traits. RESEARCH DESIGN AND METHODS: We tested the association between FTO genotype and 10 metabolic traits using data from 17,037 white European individuals. We compared the observed effect of FTO genotype on each trait to that expected given the FTO-BMI and BMI-trait associations. RESULTS: Each copy of the FTO rs9939609 A allele was associated with higher fasting insulin (0.039 SD [95% CI 0.013-0.064]; P = 0.003), glucose (0.024 [0.001-0.048]; P = 0.044), and triglycerides (0.028 [0.003-0.052]; P = 0.025) and lower HDL cholesterol (0.032 [0.008-0.057]; P = 0.009). There was no evidence of these associations when adjusting for BMI. Associations with fasting alanine aminotransferase, gamma-glutamyl-transferase, LDL cholesterol, A1C, and systolic and diastolic blood pressure were in the expected direction but did not reach P 12,000 individuals were needed to detect associations at P