Any early infantile epileptic encephalopathy in which the cause of the disease is a mutation in the GNAO1 gene. The disease is developmental and epileptic encephalopathy, 17 (MONDO_0014199). Also known as: DEE17, EIEE17, GNAO1 early infantile epileptic encephalopathy, developmental and epileptic encephalopathy 17, early infantile epileptic encephalopathy caused by mutation in GNAO1, early infantile epileptic encephalopathy-17, epileptic encephalopathy, early infantile, 17, epileptic encephalopathy, early infantile, type 17.