MONDO_0010632 (developmental and epileptic encephalopathy, 1) is any early infantile epileptic encephalopathy in which the cause of the disease is a mutation in the ARX gene. Also known as: ARX early infantile epileptic encephalopathy, DEE1, EIEE1, developmental and epileptic encephalopathy 1, X-linked recessive, early infantile epileptic encephalopathy caused by mutation in ARX, early infantile epileptic encephalopathy caused by mutation in arx, epileptic encephalopathy, early infantile, 1, epileptic encephalopathy, early infantile, type 1.