The TCF7L2 diabetes risk variant is associated with HbA₁(C) levels: a genome-wide association meta-analysis.

Abstract:

:Genome-wide association (GWA) studies have identified around 20 common genetic variants influencing the risk of type 2 diabetes (T2D). Likewise, a number of variants have been associated with diabetes-related quantitative glycaemic traits, but to date the overlap between these genes and variants has been low. The majority of genetic studies have focused on fasting plasma glucose levels; however, this measure is highly variable. We have conducted a GWA meta-analysis of glycated haemoglobin (HbA₁(C) ) levels within three healthy nondiabetic populations. This phenotype provides an estimate of mean glucose levels over 2-3 months and is a more stable predictor of future diabetes risk. Participants were from three isolated populations: the Orkney Isles in the north of Scotland, the Dalmatian islands of Vis, and Korčula in Croatia (total of 1782 nondiabetic subjects). Association was tested in each population and results combined by meta-analysis. The strongest association was with the TCF7L2 gene (rs7903146, P= 1.48 × 10⁻⁷). This is also the strongest common genetic risk factor for T2D but it has not been identified in previous genome-wide studies of glycated haemoglobin.

journal_name

Ann Hum Genet

journal_title

Annals of human genetics

authors

Franklin CS,Aulchenko YS,Huffman JE,Vitart V,Hayward C,Polašek O,Knott S,Zgaga L,Zemunik T,Rudan I,Campbell H,Wright AF,Wild SH,Wilson JF

doi

10.1111/j.1469-1809.2010.00607.x

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

471-8

issue

6

eissn

0003-4800

issn

1469-1809

journal_volume

74

pub_type

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