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Molecular assay reagents intended to identify deletions or duplications of the sodium voltage-gated channel alpha subunit 4 (SCN4A) gene, located at chromosome 17q23.3, which encodes the protein sodium channel protein type 4 subunit alpha. Genetic variants at this locus have been associated with congenital myasthenic syndrome, hypokalemic periodic paralysis, paramyotonia congenita of Von Eulenburg, and potassium aggravated myotonia.
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