No Association Between the MnSOD Val16Ala Polymorphism and Diabetic Nephropathy Risk in Type 2 Diabetes: A Meta-Analysis
摘要
The association between the MnSOD Val16Ala polymorphism and the development of diabetic nephropathy (DN) has yielded inconsistent results prompting the conduct of this meta-analysis.
MethodsWe comprehensively searched four major electronic databases to identify studies containing genotypic data of the MnSOD Val16Ala polymorphism in type 2 diabetes mellitus (T2DM) and DN groups. Data were collected and analyzed using Review Manager 5.4.1 by calculating the odds ratios (ORs) and 95% confidence intervals (CIs).
ResultsTwelve studies comprising 5,770 participants were analyzed. No significant association was found between the MnSOD Val16Ala polymorphism and DN risk across all genetic models, even after excluding outliers and restricting analyses to HWE-compliant studies. However, genotype distribution differed significantly between East and West Asian cohorts, with a higher frequency of the Ala allele among East Asian T2DM patients, suggesting possible population-specific genetic predisposition.
ConclusionThis meta-analysis does not provide conclusive evidence linking the MnSOD Val16Ala polymorphism to DN susceptibility in T2DM. Nevertheless, the observed ethnic differences in allele frequency may indicate a potential population-specific genetic risk, which requires confirmation through larger, multi-ethnic studies with standardized diagnostic criteria.