DMD and Becker muscular dystrophy: DMD mutations, including nonsense and missense variations, cause Duchenne muscular dystrophy (DMD, OMIM* 300377) a rare, severe and fatal muscle dystrophy, or the milder form, Becker muscular dystrophy (BMD; OMIM *300376), both inherited as X-linked recessive diseases, with an incidence of 1:5000 newborn males.