期刊
INTERNATIONAL JOURNAL OF CARDIOLOGY
卷 147, 期 2, 页码 246-252出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.ijcard.2009.08.041
关键词
Cardiomyopathy; CPVT; RyR2; Sudden cardiac death; Ventricular premature complex
资金
- Sigrid Juselius Foundation
- Finnish Academy
- Finska Lakaresallskapet
- Biomedicum Helsinki Foundation
- Emil Aaltonen Foundation
Background: Catecholaminergic polymorphic ventricular tachycardia caused by mutations in the RyR2 gene manifests as severe arrhythmias, and may provide a candidate for sudden cardiac deaths. Methods: We screened 19 victims of SCD for mutations in the RyR2 gene by direct sequencing, and analyzed DNAs from available family members and from 300 controls. Medico-legal investigations were conducted by experienced pathologists. We performed resting ECG, cardiac ultrasonography, exercise stress test, epinephrine test and 24-hour ambulatory ECG recording to related mutation carriers (n = 17). The single channel recordings of the mutant RyR2s were conducted in planar lipid bilayers, and the open probabilities were determined by sequential addition of CaCl(2) to the cis-side. Results: We identified two novel RyR2 missense mutations (G2145R and R3570W) in three victims of SCD. The surviving carriers of these mutations exhibited only minor, if any structural abnormalities, and two carriers of R3570W showed ventricular arrhythmias predominantly at rest. Single channel recordings revealed a gain-of-function defect in native unphosphorylated R3570W and a similar but milder defect in native G2145R. Conclusions: RyR2 mutations manifesting as a gain-of-function defect in vitro may be detectable in some cases of SCD. Not all RyR2 mutations lead to a uniform, highly penetrant CPVT phenotype. (C) 2009 Elsevier Ireland Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据