SCN1A: epileptic encephalopathy, early infantile, 6 (Dravet syndrome; MIM 607208); epilepsy, generalized, with febrile seizures plus, type 2 (MIM 604403); febrile seizures, familial, 3A (MIM 604403);SCN2A: epileptic encephalopathy, early infantile, 11 (MIM 61372); seizures, benign familial infantile, 3 (MIM 6077451). Here, SCN2A is linked to encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy.