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Dynamic change in ST-segment and spontaneous occurrence of ventricular fibrillation in Brugada syndrome with a novel nonsense mutation in the SCN5A gene during long-term follow-up.

Authors
  • Kawamura, Mihoko
  • Ozawa, Tomoya
  • Yao, Takenori
  • Ashihara, Takashi
  • Sugimoto, Yoshihisa
  • Yagi, Takafumi
  • Itoh, Hideki
  • Ito, Makoto
  • Makiyama, Takeru
  • Horie, Minoru
Type
Published Article
Journal
Circulation journal : official journal of the Japanese Circulation Society
Publication Date
Mar 01, 2009
Volume
73
Issue
3
Pages
584–588
Identifiers
PMID: 19075524
Source
Medline
License
Unknown

Abstract

A 67-year-old male underwent genetic testing under the diagnosis of Brugada syndrome because of recurrent ventricular fibrillation with coincident ST-segment elevation in either right precordial, inferior leads or both since the age of 55 years. Screening of gene mutations using denaturing high-performance liquid chromatography (DHPLC) and direct sequencing identified a novel nonsense mutation (R179X) of SCN5A in a heterozygous manner. The functional assay for the identified mutation, using a whole-cell patch clamp in the heterologous expression system, revealed that the nonsense mutation, located in the second transmembrane segment of the first domain (DI-S2) of the alpha-subunit, failed to synthesize the complete structure of the cardiac sodium channel, thus causing the non-functional channel. Coding effects by the gene mutation was altered during the 12-year follow-up, which might affect the clinical features of the patient through the ion channel density in the ventricle, dynamics of repolarization abnormality and conduction disturbance.

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