Substitution of a conserved alanine in the domain IIIS4-S5 linker of the cardiac sodium channel causes long QT syndrome.

Details

Serval ID
serval:BIB_21BA807D0AC8
Type
Article: article from journal or magazin.
Collection
Publications
Title
Substitution of a conserved alanine in the domain IIIS4-S5 linker of the cardiac sodium channel causes long QT syndrome.
Journal
Cardiovascular research
Author(s)
Smits J.P., Veldkamp M.W., Bezzina C.R., Bhuiyan Z.A., Wedekind H., Schulze-Bahr E., Wilde A.A.
ISSN
0008-6363 (Print)
ISSN-L
0008-6363
Publication state
Published
Issued date
15/08/2005
Peer-reviewed
Oui
Volume
67
Number
3
Pages
459-466
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
Congenital long QT syndrome type 3 (LQT3) is an inherited cardiac arrhythmia disorder due to mutations in the cardiac sodium channel gene, SCN5A. Although most LQT3 mutations cause a persistent sodium current, increasing diversity in the disease mechanism is shown. Here we present the electrophysiological properties of the A1330T sodium channel mutation (DIIIS4-S5 linker). Like the A1330P, LQT3 mutation, A1330T, causes LQT3 in the absence of a persistent current.
A1330T, A1330P and wild-type sodium channels were expressed in HEK-293 cells and characterized using the whole-cell configuration of the patch-clamp technique.
The A1330T mutation shifts positively the voltage-dependence of inactivation and speeds recovery from inactivation. Measurements of sodium window (I(Na, window)) currents revealed a positive shift of the I(Na, window) voltage range for both 1330 mutants, with in addition an increase in I(Na, window) magnitude for the A1330P mutant. Action potential (AP) clamp experiments revealed that these changes in I(Na, window) properties cause an increased inward current during the initial part of phase 4 repolarization of the AP.
Our findings indicate that the alanine at position 1330 in the DIIIS4-S5 linker of the cardiac sodium channel has a role in channel fast inactivation. Substitution by a threonine shifts the voltage range of I(Na, window) activity to more positive potentials. Here the counter-acting effect of outward K+ current is reduced and may delay AP repolarization, explaining the LQT3 phenotype.

Keywords
Adolescent, Adult, Alanine/genetics, Cell Line, Conserved Sequence, Death, Sudden, Cardiac, Electrophysiology, Female, Humans, Ion Channel Gating, Long QT Syndrome/genetics, Long QT Syndrome/metabolism, Male, Muscle Proteins/genetics, Muscle Proteins/metabolism, Myocardium/metabolism, NAV1.5 Voltage-Gated Sodium Channel, Patch-Clamp Techniques, Pedigree, Protein Structure, Tertiary, Sodium Channels/genetics, Sodium Channels/metabolism, Transfection
Pubmed
Web of science
Open Access
Yes
Create date
01/03/2018 15:39
Last modification date
20/08/2019 12:58
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