Myasthenic Syndrome, Congenital, 7a, Presynaptic, and Distal Motor Neuropathy, Autosomal Dominant, also known as cms7a, is related to congenital myasthenic syndrome 7. An important gene associated with Myasthenic Syndrome, Congenital, 7a, Presynaptic, and Distal Motor Neuropathy, Autosomal Dominant is SYT2 (Synaptotagmin 2). Affiliated tissues include skeletal muscle.