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A form of epileptic encephalopathy, a heterogeneous group of severe early-onset epilepsies characterized by refractory seizures, neurodevelopmental impairment, and poor prognosis. Development is normal prior to seizure onset, after which cognitive and motor delays become apparent. DEE80 is an autosomal recessive form characterized by onset of refractory seizures in the first year of life, severe global developmental delay and/or intellectual disability. Additional variable features include polyneuropathy, hearing loss, visual impairment, dysmorphic or coarse facial features, and distal skeletal abnormalities.




Epileptic encephalopathy, early infantile, 80
Glycosylphosphatidylinositol biosynthesis defect 20




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