期刊
HEART RHYTHM
卷 6, 期 5, 页码 634-641出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.hrthm.2009.02.022
关键词
Conduction; Electrocardiography; Electrophysiology; Genetics; Ion channels
资金
- National Institutes of Health [NIH K23-HL-080025]
- Doris Duke Charitable Foundation Clinical Scientist Development
- Burroughs Wellcome Fund Career
- Basic Research front the Massachusetts Biomedical Research Corporation
- Burroughs Wellcome Fund Clinical Scholar in Translational Research and a Distinguished Clinical Scholar of the Doris Duke Charitable Foundation
- Starr Foundation
- Howard Hughes Medical Institute
BACKGROUND Cardiac conduction, as assessed by electrocardiographic PR interval and QRS duration, is an important electrophysiological trait and a determinant of arrhythmia risk. OBJECTIVE We sought to identify common genetic determinants of these measures. METHODS We examined 1604 individuals from the island of Kosrae, Federated States of Micronesia, an isolated founder population. We adjusted for covariates and estimated the heritability of quantitative electrocardiographic QRS duration and PR interval and, secondarily, its subcomponents, P-wave duration and PR segment. Finally, we performed a genome-wide association study (GWAS) in a subset of 1262 individuals genotyped using the Affymetrix GeneChip Human Mapping 500K microarray. RESULTS The heritability of PR interval was 34% (standard error [SE] 5%, P = 4 x 10(-18)); of PR segment, 31% (SE 6%, P = 3.2 x 10(-13)); and of P-wave duration, 17% (SE 5%, P = 5.8 x 10(-6)), but the heritablitity of QRS duration was only 3% (SE 4%, P = .20). Hence, GWAS was performed only for the PR interval and its subcomponents. A total of 338,049 single nucleotide polymorphisms (SNPs) passed quality filters. For the PR interval, the most significantly associated SNPs were located in and downstream of the alpha-subunit of the cardiac voltage-gated sodium channel gene SCN5A, with a 4.8 ms (SE 1.0) or 0.23 standard deviation increase in adjusted PR interval for each minor allele copy of rs7638909 (P = 1.6 x 10(-6), minor allele frequency 0.40). These SNPs were also associated with P-wave duration (P = 1.5 x 10(-4)) and PR segment (P = .01) but not with QRS duration (P >= .22). CONCLUSIONS The PR interval and its subcomponents showed substantial heritability in a South Pacific islander population and were associated with common genetic variation in SCN5A.
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