Examples of mutations of the DMD gene and their consequences on the production of dystrophin and the corresponding phenotypes. The boxes represent exons. Right faces of boxes indicate that the exon codes for an entire protein sequence based on three-bases codons (examples: exons 47, 48, 49). Curved faces indicate that the exon does not code for an entire protein sequence but that either the first or the last bases need the preceding or following exon to code a full three-bases codon (examples: exons 50, 51, 52).
BMD: Becker muscular dystrophy; DMD: Duchenne muscular dystrophy. * Missense mutations may sometimes cause DMD. ¶ Nonsense mutations may sometimes cause BMD.