Journal Article

The implications of genetic mutations in the sodium channel gene (SCN5A)

E. Moric, E. Herbert, M. Trusz-Gluza, A. Filipecki, U. Mazurek and T. Wilczok

in EP Europace

Published on behalf of European Heart Rhythm Association of the European Society of Cardiology (ESC)

Volume 5, issue 4, pages 325-334
Published in print October 2003 | ISSN: 1099-5129
Published online October 2003 | e-ISSN: 1532-2092 | DOI:
The implications of genetic mutations in the sodium channel gene (SCN5A)

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Mutations in sodium channel α-subunit gene (SCN5A) result in multiple arrhythmic syndromes, including long QT3 (LQT3), Brugada syndrome (BS), an inherited cardiac conduction defect, sudden unexpected nocturnal death syndrome (SUNDS) and sudden infant death syndrome (SIDS), constituting a spectrum of disease entities termed Na+ channelopathies. These diseases are allelic disorders, if not the same disease with variable penetrance and variable modifiers worldwide. Interestingly, death occurs during sleep in all of these disorders, suggesting a common mechanism.

To date, mutational analyses have revealed about 103 distinct mutations in SCN5A, of which at least more than 30 mutations are associated with LQT3, whereas the rest of the mutations are affiliated with the remaining sodium channel disorders. The majority of these mutations are missense. However, other types such as deletions, insertions, frameshifts, nonsense and splice-donor errors have also been reported.

Keywords: Arrhythmia; Brugada syndrome; long QT3 syndrome; SCN5A gene; sodium channel; mutation

Journal Article.  5973 words.  Illustrated.

Subjects: Cardiovascular Medicine

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