Myasthenic Syndrome, Congenital, 16, also known as congenital myasthenic syndrome 16, is related to congenital myopathy 22a, classic and normokalemic periodic paralysis. An important gene associated with Myasthenic Syndrome, Congenital, 16 is SCN4A (Sodium Voltage-Gated Channel Alpha Subunit 4). Affiliated tissues include skeletal muscle, and related phenotypes are ptosis and gait disturbance