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A novel mutation in the SCN5A gene is associated with Brugada syndrome

 Dong-Jik Shin  ;  Eunmin Kim  ;  Sungjoo Kim Yoon  ;  Mohamed Chahine  ;  Hai Huang  ;  Sung Soon Kim  ;  Moon Hyoung Lee  ;  Boyoung Joung  ;  Yangsoo Jang  ;  Jihye Han  ;  Yoonsun Bae  ;  Won-Cheoul Jang  ;  Sang-Bum Park 
 Life Sciences, Vol.80(8) : 716-724, 2007 
Journal Title
 Life Sciences 
Issue Date
Brugada syndrome (BS) is an inherited cardiac disorder associated with a high risk of sudden cardiac death and is caused by mutations in the SCN5A gene encoding the cardiac sodium channel α-subunit (Nav1.5). The aim of this study was to identify the genetic cause of familial BS and characterize the electrophysiological properties of a novel SCN5A mutation (W1191X). Four families and one patient with BS were screened for SCN5A mutations by PCR and direct sequencing. Wild-type (WT) and mutant Nav1.5 channels were expressed in tsA201 cells, and the sodium currents (INa) were analyzed using the whole-cell patch-clamp technique. A novel mutation, W1191X, was identified in a family with BS. Expression of the WT or the mutant channel (Nav1.5/W1191X) co-transfected with the β1-subunit in tsA201 cells resulted in a loss of function of Nav1.5 channels. While voltage-clamp recordings of the WT channel showed a distinct acceleration of Nav1.5 activation and fast inactivation kinetics, the Nav1.5/W1191X mutant failed to generate any currents. Co-expression of the WT channel and the mutant channel resulted in a 50% reduction in INa. No effect on activation and inactivation were observed with this heterozygous expression. The W1191X mutation is associated with BS and resulted in the loss of function of the cardiac sodium channel.
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5. Research Institutes (연구소) > Research Center for Human Natural Defense System (생체방어연구센터) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
Yonsei Authors
김성순(Kim, Sung Soon)
이문형(Lee, Moon Hyoung) ORCID logo https://orcid.org/0000-0002-7268-0741
장양수(Jang, Yang Soo) ORCID logo https://orcid.org/0000-0002-2169-3112
정보영(Joung, Bo Young) ORCID logo https://orcid.org/0000-0001-9036-7225
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