['MicroRNAs are small, single-stranded, non-protein-coding RNAs of about 22 nucleotides. MicroRNA molecules have been identified to play key roles in a broad range of physiologic and pathologic processes. Polymorphisms in the corresponding sequence space are likely to make a significant contribution to phenotypic variation. A T/C genetic variant (rs11614913) in the pre-miR-196a2 sequence could alter mature miR-196a expression and target mRNA binding. The aim of the present study is to evaluate the relationship between this polymorphism and atrial fibrillation (AF).', 'A total of 123 participants were enrolled, 65 AF patients were confirmed with electrocardiogram (ECG) or dynamic electrocardiography, 58 normal individuals were assigned to the control group. Genotypes of the premiR-196a2 were distinguished using the method of polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay.', 'The distribution of the pre-miR-196a2 genotypes (TT, TC, and CC) was 15.38%, 46.15%, and 38.46% in the AF group and 39.66%, 46.55%, and 13.79% in the controls, respectively (p = 0.0011). Compared with the TT genotype, the C allele carriers (TC+CC genotypes) had a 3.968-fold increased risk of AF (adjusted OR = 3.968, 95% CI = 1.633 - 9.644, p = 0.002). AF patients with the TC+CC genotype had greater left atrial dimension than did patients with the TT genotype (42.10 ± 8.74 vs. 35.13 ± 8.16, p = 0.0224).'] Is a Functional Single-Nucleotide Polymorphism in Pre-microRNA-196a2 Associated with Atrial Fibrillation in Han Chinese?