A voltage-gated sodium channel subtype that mediates the sodium ion PERMEABILITY of SKELETAL MYOCYTES. Defects in the SCN4A gene, which codes for the alpha subunit of this sodium channel, are associated with several MYOTONIC DISORDERS.

Synonyms: Type 4 Voltage Gated Sodium Channel, NAV1.4 Voltage Gated Sodium Channel, Sodium Channel, Voltage-Gated, Type IV, alpha 1 Subunit, Voltage Gated Sodium Channel Type 4, NAV1.4 Voltage-Gated Sodium Channel, Voltage-Gated Sodium Channel Type 4 Subunit alpha, Subunit, NAV1.4 alpha, 0, Voltage-Gated Sodium Channel Type 4, NAV1.4 alpha Subunit, SCN4A Sodium Channel alpha Subunit, Type 4 Voltage-Gated Sodium Channel, alpha Subunit, NAV1.4, Voltage Gated Sodium Channel Type 4 Subunit alpha