Objectives: Results from the published studies on the association of ADRA2A (adrenoceptor alpha 2A) variants with type 2 diabetes (T2D) are conflicting and call for further assessment. The aim of this meta-analysis was to quantitatively summarize the effects of the two recently reported ADRA2A single nucleotide polymorphisms (SNPs) rs553668 and rs10885122 on T2D risk.
Design and methods: We searched all the publications about the association between the ADRA2A SNPs and T2D from PubMed and ISI database updated on September 2012. Meta-analysis of the overall odds ratios (ORs) with 95% confidence intervals (CIs) was calculated by using the software STATA 11.0.
Results: Twelve studies with 40,828 subjects from seven eligible papers were included in the meta-analysis. Overall, the present meta-analysis failed to support a positive association between ADRA2A SNPs (rs553668 and rs10885122) and susceptibility to T2D (OR=1.05, p=0.17, 95% CI: 0.98, 1.12; and OR=1.06, p=0.11, 95% CI: 0.99, 1.13; respectively). However, in the subgroup analysis by ethnicity, the significant association between rs553668 and the risk of T2D was obtained in Europeans under the recessive genetic model (OR=1.36, p=0.02, 95% CI: 1.05, 1.76).
Conclusions: This meta-analysis suggested that the AA genotype of rs553668 in ADRA2A might be a genetic risk factor that increases T2D susceptibility in Europeans. However, rs10885122 was unlikely substantially contribute to T2D susceptibility.
Copyright © 2013 The Canadian Society of Clinical Chemists. Published by Elsevier Inc. All rights reserved.