autosomal dominant intellectual developmental disorder neurodevelopmental disorder with hypotonia, stereotypic hand movements, and impaired language MIM:613443 An autosomal dominant intellectual developmental disorder that is characterized by global developmental delay with hypotonia, poor motor development with limited walking, impaired intellectual development with poor or absent speech, and behavioral abnormalities and that has_material_basis_in an autosomal dominant mutation of the MEF2C gene on chromosome 5q14.3. MRD20 autosomal dominant mental retardation 20 disease_ontology DOID:0070050 mental retardation, autosomal dominant 20