The rs2236609 Polymorphism Is Related to Increased Risk Susceptibility of Atrial Fibrillation.

Introduction: Genetic variations in the slow component of the delayed rectifier potassium channels (IKs) are reported to contribute to an increased susceptibility to arrhythmias. This study aims to investigate the frequency and the possible association of the rs2236609 polymorphism in the KCNE1 gene and the risk of atrial fibrillation (AF).

Methods: This was a case-control study that recruited 100 patients suffering from AF (mean age 49.4 ± 15.1 years), and a control group of 95 healthy participants older than 55 years (mean age 59.8 ± 4.1 years) with no history of cardiovascular disease, hypertension, or diabetes. Genomic DNA was extracted from whole peripheral blood, and the desired fragment was amplified using polymerase chain reaction followed by restriction digestion with the NspI restriction enzyme.

Results: The results showed a significant difference between the single-nucle-otide polymorphism variations in AF patients and controls (p < 0.022). The risk of AF in the GG genotype was significantly decreased (odds ratio [OR] 0.42; 95% confidence interval [Cl] 0.23-0.79). The risk of AF in the GA (OR 2.12; 95% Cl 1.11-4.06) and AA (OR 2.28, 95% Cl 0.57-9.1) genotypes was significantly increased. The odds of developing AF according to A allele counting was significantly increased (OR 2.1; 95% Cl 1.2608-3.638; p = 0.0048).

Conclusion: Our results showed a significant increase in AF risk in people carrying the A allele, while the G allele might be considered as a protective allele.