Journal
JOURNAL OF INTERNAL MEDICINE
Volume 265, Issue 4, Pages 448-458Publisher
WILEY
DOI: 10.1111/j.1365-2796.2008.02026.x
Keywords
epidemiology; genetics; KCNE1; long-QT syndrome; QT interval
Categories
Funding
- Sigrid Juselius Foundation
- Finnish Academy
- Finska LAkaresAlskapet Foundation
- Biomedicum Helsinki Foundation
- NIH [K23HL080025]
- Aarne Koskelo Foundation
- Finnish Foundation for Cardiovascular Research
- Ida Montin Foundation
- Paavo and Eila Salonen Foundation
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QT interval prolongation is associated with increased risk of sudden cardiac death at the population level. As 30-40% of the QT-interval variability is heritable, we tested the association of common LQTS and NOS1AP gene variants with QT interval in a Finnish population-based sample. We genotyped 12 common LQTS and NOS1AP genetic variants in Health 2000, an epidemiological sample of 5043 Finnish individuals, using Sequenom MALDI-TOF mass spectrometry. ECG parameters were measured from digital 12-lead ECGs and QT intervals were adjusted for age, gender and heart rate with a nomogram (Nc) method derived from the present study population. The KCNE1 D85N minor allele (frequency 1.4%) was associated with a 10.5 ms (SE 1.6) or 0.57 SD prolongation of the adjusted QT(Nc) interval (P = 3.6 x 10(-11)) in gender-pooled analysis. In agreement with previous studies, we replicated the association with QT(Nc) interval with minor alleles of KCNH2 intronic SNP rs3807375 [1.6 ms (SE 0.4) or 0.08 SD, P = 4.7 x 10(-5)], KCNH2 K897T [-2.6 ms (SE 0.5) or -0.14 SD, P = 2.1 x 10(-7)] and NOSA1P variants including rs2880058 [4.0 ms (SE 0.4) or 0.22 SD, P = 3.2 x 10(-24)] under additive models. We demonstrate that each additional copy of the KCNE1 D85N minor allele is associated with a considerable 10.5 ms prolongation of the age-, gender- and heart rate-adjusted QT interval and could thus modulate repolarization-related arrhythmia susceptibility at the population level. In addition, we robustly confirm the previous findings that three independent KCNH2 and NOSA1P variants are associated with adjusted QT interval.
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