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| Research article summary (published 23 Oct 2009): |
Common candidate gene variants are associated with QT interval duration in the general population.
Full Abstract
OBJECTIVES: 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. METHODS: 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. RESULTS: 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. CONCLUSIONS: 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.
Author information
Author/s: Marjamaa, A (A); Newton-Cheh, C (C); Porthan, K (K); Reunanen, A (A); Lahermo, P (P); Väänänen, H (H); Jula, A (A); Karanko, H (H); Swan, H (H); Toivonen, L (L); Nieminen, M S (MS); Viitasalo, M (M); Peltonen, L (L); Oikarinen, L (L); Palotie, A (A); Kontula, K (K); Salomaa, V (V);
Affiliation: Research Program in Molecular Medicine, Biomedicum Helsinki, University of Helsinki, Helsinki, Finland.
Grants: 089061 (Agency:Wellcome Trust) ; 089062 (Agency:Wellcome Trust) ; K23 HL080025-04 (Agency:NHLBI NIH HHS) ; K23HL080025 (Agency:NHLBI NIH HHS)
Journal and publication information
Publication Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't
Journal: Journal of internal medicine (J Intern Med), published in England. (Language: eng)
Reference: 2009-Apr; vol 265 (issue 4) : pp 448-58
Dates: Created 2009/03/20; Completed 2009/06/18; Revised 2009/10/02;
PMID: 19019189, status: MEDLINE (last retrieval date: 10/5/2009, IMS Date: )
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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