Phenotypes for disease #05887 (PEBEL1 (encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy, type 1 (PEBEL1)), OMIM:617186)

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0000257422 progressive myoclonus epilepsy , developmental delay - Onset age 12 of versive motor seizures on background of developmental delay (at onset EEGs were suggestive of Lafora or mitochondrial disease, as they showed bi-occipital spiking that was suppressed by eye opening, generalized spikes and strong photosensitivity). Absence seizures from 13 years, daily myoclonus from 15 years. Occasional TCS. Slowly progressive severe ataxia, Dementia. Abnormal eye movements, hyper-reflexia, bilateral Hoffman's and Babinski reflexes, mild extrapyramidal signs. Brain MRI as well as muscle and skin biopsy were unremarkable. Death at 26 years due to refractory myoclonic status. Familial, autosomal recessive - - - - Johan den Dunnen 00334932
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