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CircFOXO3 plays an important role in the pathogenesis of coronary artery disease (CAD). Single nucleotide polymorphisms (SNPs) at circRNA flanking introns may change its back-splicing and influence circRNA formation. Here, we aimed to investigate the influence of the polymorphisms at the circFOXO3 flanking introns on individual susceptibility to CAD. A total of 1185 individuals were included in the case-control study. In a multivariate logistic regression analysis, we determined that the rs12196996 G variant was significantly associated with increased CAD risk (OR = 1.36, P = 0.014). A similar trend of the association was observed in the recessive model (OR = 2.57, P = 0.003). Stratified analysis revealed a more significant association with CAD risk among younger subjects and non-smokers. Consistent with these results, the haplotype rs12196996G-rs9398171C containing rs12196996G allele was also associated with increased CAD risk (OR = 1.31, P = 0.013). Further investigation revealed that the rs12196996 GG genotype was associated with decreased circFOXO3 expression, but not linear FOXO3 levels. Taken together, our data provide the first evidence that the rs12196996 polymorphism at the circFOXO3 gene flanking intron is associated with CAD risk in the Chinese Han population, which is probably due to influence circFOXO3 levels.

CircFOXO3 rs12196996, a polymorphism at the gene flanking intron, is associated with circFOXO3 levels and the risk of coronary artery disease