Muscle dystrophy is a X-linked genetic myopathy caused by mutations in the dystrophin gene DMD. Depending on the residual function of the protein product, mutations either lead to the more severe phenotype of Duchenne muscular dystrophy (DMD) (complete LoF) or the milder form of Becker muscular dystrophy (partial LoF). Here, DMD is linked to Duchenne muscular dystrophy.