genetic developmental and epileptic encephalopathy developmental and epileptic encephalopathy 94 Epileptic encephalopathy, childhood-onset DEE94 OMIM:615369 CHD2-Related Neurodevelopmental Disorders Developmental and epileptic encephalopathy-94 (DEE94) is a severe form of epilepsy characterized by onset of multiple seizure types in the first few years of life and associated with poor prognosis. Affected individuals have cognitive regression and impaired intellectual development (summary by Carvill et al., 2013).