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Europace 2003 5(4):325-334; doi:10.1016/S1099-5129(03)00085-0
© 2003 by European Society of Cardiology
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REVIEW

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

E. Moric1, E. Herbert1, M. Trusz-Gluza2, A. Filipecki2, U. Mazurek1 and T. Wilczok1

1Department of Molecular Biology, Biochemistry and Biopharmacy, Medical University of Silesia ul. Narcyzów 1, Sosnowiec, Poland; 2I Department of Cardiology, Medical University of Silesia ul. Ziolowa 45/47, 40-635 Katowice, Poland

Mutations in sodium channel {alpha}-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.

Key Words: Arrhythmia, Brugada syndrome, long QT3 syndrome, SCN5A gene, sodium channel, mutation

Correspondence: Ewa Moric, PhD, Department of Molecular Biology, Biochemistry and Biopharmacy, Medical University of Silesia, ul. Narcyzów 1, 41-200 Sosnowiec, Poland. Tel.: +48-32-291-43-93x54; Fax: +48-32-291-74-66. E-mail: e.moric{at}poczta.clinika.pl; bulba2{at}wp.pl


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