Abstract: The present disclosure relates generally to methods of treating a subject having muscular dystrophy or DMD. The present disclosure also relates generally to methods of prophylactically treating a subject at risk of developing muscular dystrophy or DMD. In some embodiments, the methods may include administering a pharmaceutical composition including an RRM1 gene, an RRM2 gene, and a delivery vehicle to a subject. In another embodiment, the methods may include administering a pharmaceutical composition including an RRM1 gene and an RRM2 gene coupled to a regulatory cassette to a subject. In yet another embodiment, the methods may include administering a pharmaceutical composition including an RRM 1 gene, an RRM2 gene, a regulatory cassette, and a delivery vehicle to a subject.