Genetic polymorphisms in pre-microRNAs and risk of ischemic stroke in a Chinese population.

Ischemic stroke is considered to be a complex disease consisting of a group of heterogeneous disorders with multiple genetic and environmental risk factors. MicroRNAs participated in various physiopathological processes; common single-nucleotide polymorphisms (SNPs) in pre-miRNAs have been shown to be associated with susceptibility to several human diseases. We evaluated the associations of the hsa-mir-196-a2/rs11614913 T/C, hsa-mir-146a/rs2910164 C/G, and hsa-mir-499/rs3746444 A/G polymorphisms in pre-miRNAs with the risk of ischemic stroke in a Chinese population. The three polymorphisms were identified in 296 ischemic stroke patients and 391 healthy controls using polymerase chain reaction-restriction fragment length polymorphism. The frequency of the allele G of hsa-mir-499/rs3746444 A/G showed significant association with ischemic stroke when compared with controls (OR = 1.509, 95%CI = 1.151-1.978, P = 0.003). Increased ischemic stroke risks were associated with rs3746444 A/G genotypes in different genetic model (homozygote comparison: P = 0.045, OR = 2.084, 95%CI = 1.019-4.262; heterozygote comparison: P = 0.024, OR = 1.489, 95%CI = 1.063-2.087; dominant genetic model: P = 0.007, OR = 1.563, 95%CI = 1.135-2.153). Similar results were obtained by adjusted fully risk factors. However, we failed to find any association between the alleles and genotypes of rs2910164 C/G and rs11614913 T/C SNPs and ischemic stroke, respectively (p > 0.05). The present study provided evidence that hsa-mir-499/rs3746444 A/G polymorphism might be associated with a significantly increased risk of ischemic stroke in a Chinese population, indicating that the common genetic polymorphism in pre-microRNAs contributed to the pathogenesis of ischemic stroke.