has material basis in autosomal dominant disease developmental and epileptic encephalopathy 62 A developmental and epileptic encephalopathy characterized by onset of refractory seizures in the first weeks or months of life, severe to profound developmental delay, hypotonia, and impaired motor and cognitive development that has_material_basis_in heterozygous mutation in the SCN3A gene on chromosome 2q24. MIM:617938 DOID:0080420 DEE62 disease_ontology early infantile epileptic encephalopathy 62 developmental and epileptic encephalopathy autosomal dominant inheritance