Dystrophinopathies are caused by a variety of types of mutations in the dystrophin gene (exonic deletions and duplications, a range of smaller mutations within exons, as well as rare deletions to non-coding regions).  Molecular genetic testing for Duchenne/Becker has experienced vast improvements in the past decade, and is currently a recommended aspect of confirming a diagnosis of muscular dystrophy ([1]).  In the registry questionnaire, participants may enter the type and location of the causative mutation. This evidence concerns the gene DMD and neuromuscular disease caused by qualitative or quantitative defects of dystrophin.