Characterization of a novel missense mutation in the pore of HERG in a patient with long QT Syndrome

被引:15
作者
Yoshida, H
Horie, M [1 ]
Otani, H
Takano, M
Tsuji, K
Kubota, T
Fukunami, M
Sasayama, S
机构
[1] Kyoto Univ, Grad Sch Med, Dept Cardiovasc Med, Div Cardiac Electrophysiol, Kyoto 6068507, Japan
[2] Kyoto Univ, Grad Sch Med, Dept Physiol & Biophys, Kyoto 606, Japan
[3] Osaka Prefecture Hosp, Div Cardiol, Osaka, Japan
关键词
long QT syndrome; HERG; missense mutation; patch clamp recording;
D O I
10.1111/j.1540-8167.1999.tb00304.x
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
HERG Mutation and Long QT Syndrome. Introduction: A new strategy to elucidate the molecular mechanisms underlying the long QT syndrome (LQTS) is now available with genetic mutational analyses and characterization of ion channel mutations. Methods and Results: In a 26-year-old woman with LQTS, we identified a novel missense mutation in the pore of HERG by using polymerase chain reaction/single-strand conformation polymorphism (PCR/SSCP) and sequencing of her genomic DNA. The mutation resulted in an amino acid substitution of a positively charged lysine for a highly conserved uncharged asparagine at codon 629 (N629K). Whole cell, patch clamp studies were conducted in COS7 cells by transfecting with wild-type (WT) and/or the mutant N629K HERG, The WT HERG produced an I-Kr-like, E-4031-sensitive conductance with an inward rectification, In contrast, the cells transfected with the N629K HERG did not display any time-dependent current. Cotransfection of WT and N629K HERG (at a ratio of 1:1) produced a significantly smaller conductance when compared with WT HERG (WT 59.9 +/- 7.3 pA/pF [n = 22] vs WT+N629K 5.5 +/- 2.3 pA/pF [n = 11]; P < 0.01), but did not alter K+ ion selectivity and tail current-voltage dependence. Because aprindine hydrochloride was effective in preventing ventricular tachycardias, we also tested the effect of the drug on WT HERG (I-Kr) and KvLQT1/KCNE1 (I-Ks) currents expressed in COS7. Conclusion: Functional analyses of a novel missense mutation in the pore of HERG suggest that the mutation causes marked reduction of I-Kr via a dominant negative effect.
引用
收藏
页码:1262 / 1270
页数:9
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