Common Genetic Variants, QT Interval, and Sudden Cardiac Death in a Finnish Population-Based Study
- 1 June 2011
- journal article
- Published by Ovid Technologies (Wolters Kluwer Health) in Circulation: Cardiovascular Genetics
- Vol. 4 (3), 305-311
- https://doi.org/10.1161/CIRCGENETICS.110.959049
Abstract
Although sudden cardiac death (SCD) is heritable, its genetic underpinnings are poorly characterized. The QT interval appears to have a graded relationship to SCD, and 35% to 45% of its variation is heritable. We examined the relationship among recently reported common genetic variants, QT interval, and SCD. We genotyped 15 common (minor allele frequency >1%) candidate single nucleotide polymorphisms (SNPs), based on association with the QT interval in prior studies, in individuals in 2 cohort studies (Health 2000, n=6597; Mini-Finland, n=801). After exclusions, we identified 116 incident SCDs from the remaining sample (n=6808). We constructed a QT genotype score (QT score ) using the allele copy number and previously reported effect estimates for each SNP. Cox proportional hazards models adjusting for age, sex, and geographical area were used for time to SCD analyses. The QT score was a continuous independent predictor of the heart rate–corrected QT interval ( P −107 ). Comparing the top with the bottom quintile of QT score , there was a 15.6-ms higher group mean QT interval ( P −84 ). A 10-ms increase in the observed QT interval was associated with an increased risk of SCD (hazard ratio, 1.19; 95% confidence interval, 1.07 to 1.32; P =0.002). There was no linear relationship between QT score and SCD risk; although in post hoc secondary analysis there was increased risk in the top compared with the middle QT score quintile (hazard ratio, 1.92; 95% confidence interval, 1.05 to 3.58; P =0.04). Our study strongly replicates the relationship between common genetic variants and the QT interval and confirms the relationship between the QT interval and SCD but does not show evidence for a linear relationship between QT score and SCD risk.Keywords
This publication has 42 references indexed in Scilit:
- A common variant of NOS1AP is associated with QT interval duration in a Chinese population with Type 2 diabetesDiabetic Medicine, 2010
- Biological, clinical and population relevance of 95 loci for blood lipidsNature, 2010
- Relationship of common candidate gene variants to electrocardiographic T-wave peak to T-wave end interval and T-wave morphology parametersHeart Rhythm, 2010
- Clinical Correlates and Heritability of QT Interval Duration in BlacksCirculation: Arrhythmia and Electrophysiology, 2009
- Genetic variation in NOS1AP is associated with sudden cardiac death: evidence from the Rotterdam StudyHuman Molecular Genetics, 2009
- Common variants at ten loci influence QT interval duration in the QTGEN StudyNature Genetics, 2009
- Common variants at ten loci modulate the QT interval duration in the QTSCD StudyNature Genetics, 2009
- Common candidate gene variants are associated with QT interval duration in the general populationJournal of Internal Medicine, 2009
- Associations between Genetic Variants in the NOS1AP (CAPON) Gene and Cardiac Repolarization in the Old Order AmishHuman Heredity, 2007
- A common genetic variant in the NOS1 regulator NOS1AP modulates cardiac repolarizationNature Genetics, 2006