Monoallelic variants in ATP1A3 have been associated with a number of neurological disorders, including alternating hemiplegia of childhood (AHC) type 2 (OMIM# 614820), rapid‐onset dystonia‐parkinsonism (RDP; OMIM# 128235), and the cerebellar ataxia, areflexia, pes cavus, optic atrophy and sensorineural hearing loss (CAPOS) syndrome (OMIM# 601338).32 The gene discussed is ATP1A3; the disease is nervous system disorder.