The genetic basis of Brugada syndrome: a mutation update

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Paula L Hedley, Poul Jørgensen, Sarah Schlamowitz, Johanna Moolman-Smook, Jørgen K Kanters, Valerie A Corfield, Michael Christiansen

Brugada syndrome (BrS) is a condition characterized by a distinct ST-segment elevation in the right precordial leads of the electrocardiogram and, clinically, by an increased risk of cardiac arrhythmia and sudden death. The condition predominantly exhibits an autosomal dominant pattern of inheritance with an average prevalence of 5:10,000 worldwide. Currently, more than 100 mutations in seven genes have been associated with BrS. Loss-of-function mutations in SCN5A, which encodes the alpha-subunit of the Na(v)1.5 sodium ion channel conducting the depolarizing I(Na) current, causes 15-20% of BrS cases. A few mutations have been described in GPD1L, which encodes glycerol-3-phosphate dehydrogenase-1 like protein; CACNA1C, which encodes the alpha-subunit of the Ca(v)1.2 ion channel conducting the depolarizing I(L,Ca) current; CACNB2, which encodes the stimulating beta2-subunit of the Ca(v)1.2 ion channel; SCN1B and SCN3B, which, in the heart, encodes beta-subunits of the Na(v)1.5 sodium ion channel, and KCNE3, which encodes the ancillary inhibitory beta-subunit of several potassium channels including the Kv4.3 ion channel conducting the repolarizing potassium I(to) current. BrS exhibits variable expressivity, reduced penetrance, and "mixed phenotypes," where families contain members with BrS as well as long QT syndrome, atrial fibrillation, short QT syndrome, conduction disease, or structural heart disease, have also been described.
Original languageEnglish
JournalHuman Mutation
Volume30
Issue number9
Pages (from-to)1256-66
Number of pages10
ISSN1059-7794
DOIs
Publication statusPublished - 2009

Bibliographical note

Keywords: Brugada Syndrome; Calcium Channels, L-Type; Humans; Mutation; Potassium Channels; Potassium Channels, Voltage-Gated; Sodium Channels

ID: 18763909