AdipoQ polymorphisms are associated with type 2 diabetes mellitus: a meta-analysis study

ObjectiveAdiponectin (AdipoQ) plays an important role in the pathogenesis of diabetes mellitus and is considered as an important candidate gene for type 2 diabetes mellitus (T2DM). So far, there have been many studies to investigate the association between the adiponectin polymorphisms and T2DM risk. However, the results are conflicting. To derive a more precise estimation, we performed a meta-analysis to assess the association between five AdipoQ polymorphisms [-11426A>G (rs16861194), -11391G>A (rs17300539), -11377C>G (rs266729), +45T>G (rs2241766) and +276G>T (rs1501299)], and T2DM risk. MethodsThe fixed and random-effects model should be used to assess the summary odds ratios (ORs) of each study. ORs with 95% confidence intervals (CIs) were used to evaluate the strength of association. On the basis of the included criteria, we selected 39 papers, among which eight for -11426A>G, 14 for -11391G>A, 21 for -11377C>G, 28 for +45T>G and 24 for +276G>T. Sensitivity analyses were conducted to assess the stability of the results. Both Begg's funnel plots and Egger's test are commonly used to evaluate publication bias. ResultsOverall, we found that individuals with the -11426G allele had a 0.15-fold significantly increased T2DM risk (additive model: 1.15, 1.04-1.27, 0.222). In the stratified analyses, we found that the -11426A>G, -11391G>A and -11377C>G polymorphisms could increase T2DM risk in European populations in the additive model. For Asian populations, we found that the -11377C>G polymorphism also could elevate T2DM risk. ConclusionsOur results suggested that the adiponectin -11426A>G polymorphism could contribute to the T2DM risk. Copyright (c) 2013 John Wiley & Sons, Ltd.