Becker disease (DOID:0081335)
Alliance: disease page
Alt IDs: OMIM:255300, OMIM:255700
Definition: A myotonia congenita that is characterized by muscle stiffness and an inability of the muscle to relax after voluntary contraction and that has_material_basis_in homozygous or compound heterozygous mutation in the gene encoding skeletal muscle chloride channel-1 (CLCN1) on chromosome 7q34.