Association between SNCA rs2736990 polymorphism and Parkinson’s disease: a meta-analysis

•SNCA rs2736990 polymorphism and Parkinson’s disease by meta-analysis.•The T allele, TT and TC genotype of rs2736990(C/T) polymorphism may decrease the risk of PD.•The rs12456492(A/G) polymorphism was associated with the risk of PD in all genetic models. Emerging evidence suggests that the SNP rs2736990 of SNCA is a susceptibility factor for idiopathic Parkinson’s disease (PD) in different populations, but the studies which examined the association have provided inconsistent results. Therefore, we performed a meta-analysis of some case-control studies to obtain a more exact estimation of there associations. All the relevant studies were extracted from PubMed, Embase, EBSCO, Chineses national knowledge infrastructure, Google Scholar and Wanfang databases (up to February 2017). A total of six studies with 2525 PD cases and 2165 controls were eventually enrolled in the present meta-analysis based on the strict inclusion and exclusion criteria. The pooled analysis showed that there is a significant association between rs2736990 polymorphism and PD susceptibility in all genetic models (T vs. C: OR=0.772, 95%CI: 0.709–0.840, P=0.001; TT vs. CC: OR=0.586, 95%CI: 0.490–0.701, P=0.001; TC vs. CC: OR=0.814, 95%CI: 0.716–0.925, P=0.002; TT+TC vs. CC: OR=0.752, 95%CI: 0.666–0.848, P=0.001; TT vs. TC+CC: OR=0.658, 95%CI: 0.561–0.772, P=0.001). Our meta-analysis provides evidence that the T allele, TT and TC genotype of rs2736990(C/T) polymorphism may decrease the risk of PD.