SCN5A

(redirected from cardiac sodium channel alpha subunit)

SCN5A

A gene on chromosome 3p21 that encodes an integral membrane protein and tetrodotoxin-resistant voltage-gated sodium channel alpha subunit, which is expressed primarily in cardiac myocytes and is responsible beginning the action potential as seen on an ECG/EKG.
 
Molecular pathology
SCN5A mutations are long QT syndrome type 3.