Association of calpain-10 rs2975760 polymorphism with type 2 diabetes mellitus: a meta-analysis

Type 2 diabetes mellitus (T2DM) accounts for the majority of diabetes cases and affects a significant proportion of the adult population worldwide. Calpain-10 has been implicated in the development of type 2 diabetes, and some polymorphisms in the CAPN10 gene have been associated with an increased risk of developing this disease. Several molecular epidemiological studies were conducted in recent years to evaluate the association between the CAPN10 rs2975760 polymorphism and T2DM risk in diverse populations. However, the results remain conflicting rather than conclusive. We performed a meta-analysis of 8 case-control studies that included 2758 T2DM cases and 2762 case-free controls. We assessed the strength of the association, using odds ratios (ORs) with 95% confidence intervals (CIs). Overall, this meta-analysis showed that the CAPN10 rs2975760 polymorphism was not associated with a significantly type 2 diabetes risk in three genetic models. However, after excluding two study for its heterogeneity, a significantly increased risk was found in all comparisons(for C vs T: OR=1.14, 95% CI=1.03-1.27, I-2=0, P-heterpgeneity=0.420, P-b=0.012; for TC vs TT: OR=1.15, 95% CI=1.01-1.30, I-2=3.8%, P-heterpgeneity=0.392, P-b=0.030; for CC+TC vs TT: OR=1.16, 95% CI=1.03-1.31, I-2=3.7%, P-heterpgeneity=0.393, P-b=0.015). No publication bias was found in the present study. This meta-analysis suggests that the C allele of the CAPN10 rs2975760 polymorphism is associated with an increased T2DM risk. Further large and well-designed studies are needed to confirm this association.