ATP1A2 variants are responsible for hemiplegic migraine type 2 (FHM2, MIM#602481; Prontera et al. 2017) and alternating hemiplegia of childhood 1 (AHC1, MIM#104290; Swoboda et al. 2004). The gene discussed is ATP1A2; the disease is alternating hemiplegia of childhood 1.