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Human SCN5A wild-type allele is located in the vicinity of 3p21 and is approximately 102 kb in length. This allele, which encodes sodium channel protein type 5 subunit alpha protein, plays a role in voltage-dependent sodium transport. Mutation of the gene is associated with long QT syndrome-3, sick sinus syndrome 1, Brugada syndrome 1, familial atrial fibrillation 10, familial ventricular fibrillation 1, dialated cardiomyopathy 1E, progressive heart block type 1A and non-progressive heart block.
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