has material basis in autosomal dominant disease congenital myopathy congenital myopathy 8 MIM:618654 disease_ontology DOID:0081342 A congenital myopathy that is characterized by hypotonia and delayed motor development apparent from infancy or childhood, resulting in difficulties walking or loss of ambulation within the first few decades and that has_material_basis_in heterozygous mutation in the ACTN2 gene on chromosome 1q43. Heterozygous mutation in the ACTN2 gene can also cause distal myopathy-6 (MPD6), which shows later onset and is less severe. autosomal dominant inheritance