Developmental and Epileptic Encephalopathy 17, also known as epileptic encephalopathy, early infantile, 17, is related to epilepsy and developmental and epileptic encephalopathy 1, and has symptoms including tonic seizures An important gene associated with Developmental and Epileptic Encephalopathy 17 is GNAO1 (G Protein Subunit Alpha O1), and among its related pathways/superpathways are EphB-EphrinB Signaling and AMPK Enzyme Complex Pathway. Affiliated tissues include tongue and brain, and related phenotypes are global developmental delay and absent speech