Association Between Genetic Variation in the <i>SCN10A</i> Gene and Cardiac Conduction Abnormalities in Patients With Hypertrophic Cardiomyopathy
Access this Article
Search this Article
Arrhythmias are associated with reduced quality of life and poor prognosis in patients with hypertrophic cardiomyopathy (HCM). Recent genome-wide association studies revealed that a nonsynonymous single nucleotide polymorphism, rs6795970, in the <i>SCN10A</i> gene was associated with the PR interval. We examined whether the PR prolonging allele (A allele) in the <i>SCN10A</i> gene may be associated with cardiac conduction abnormalities in HCM patients.<br>We genotyped the polymorphism in 149 HCM patients. Conduction abnormalities were defined as first-degree heart block, bundle-branch block, and bifascicular heart block. Patients were divided into two groups: group A consisted of 122 patients (82%) without a conduction abnormality; and group B consisted of 27 patients (18%) with one or more cardiac conduction abnormalities. The frequency distribution of the <i>SCN10A</i> genotypes (G/G, G/A, and A/A) among the patients with HCM was 71%, 26%, and 3%, respectively. A cardiac conduction abnormality was documented in 9% with G/G and 40% with G/A or A/A. There was a significant difference in the genotype distribution between the two groups (<i>P</i> = 0.0002). In the dominant A allele model, there was a significant difference in genotypes between the two groups (<i>P</i> < 0.0001). In addition, the A allele remained significant after adjusting for other covariates in a multivariate model (odds ratio = 6.30 [95% confidence interval: 2.24 to 19.09], <i>P</i> = 0.0005).<br>The rs6795970 in the <i>SCN10A</i> gene, which is reported to carry a high risk of heart block, might be associated with cardiac conduction abnormalities in HCM patients.
- International Heart Journal
International Heart Journal 56(4), 421-427, 2015
International Heart Journal Association