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Comparative Study
Journal Article
Meta-Analysis
Association between two genetic polymorphisms of the renin-angiotensin-aldosterone system and diabetic nephropathy: a meta-analysis.
Molecular Biology Reports 2012 Februrary
The widely studied candidate genes of the renin-angiotensin-aldosterone system, angiotensinogen (AGT), and angiotensin II receptor type 1 (AGTR1), are implicated in the development of diabetic nephropathy (DN). A number of studies have evaluated the association between the functional polymorphisms, AGT M235T and AGTR1 A1166C, and DN risk with conflicting results. The present meta-analysis was performed to estimate the overall risk of these polymorphisms associated with DN on 4,377 DN cases and 4,905 controls from 34 published case-control studies by searching electronic databases and reference lists of relevant articles. We examined the association between each polymorphism and the risk of DN by odds ratio (OR) with 95% confidence intervals (95% CI) and calculated the ORs for different genetic model. In addition, stratification analysis by ethnicity and diabetes mellitus (DM) type was conducted. In this meta-analysis, we failed to find any significant main effects in both overall analysis and stratified analysis for the AGT M235T. However, the overall analysis detected a significant association between the AGTR1 A1166C and the risk of DN for the CC compared with the AA and dominant genetic model (CC vs. AA: OR = 2.10, 95% CI: 1.00-4.44; dominant model: OR = 2.11, 95% CI: 1.06-4.23). In subgroup analysis, only patients with T2DM showed significant association for CC vs. AA model and dominant model (CC vs. AA: OR = 3.31, 95% CI: 1.21-9.08; dominant model: OR = 3.50, 95% CI: 1.41-8.69). This study suggests that the AGTR1 A1166C polymorphism may contribute to DN development, particularly in T2DM patients.
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