Several different mutation types can prevent the creation of a full-length, functional dystrophin protein ^{Footnotes Footnotes Footnotes 1–3}

nmDMD is caused by a point mutation leading to the presence of a premature stop codon in the DMD gene, which results in the creation of a truncated form of dystrophin ^{Footnote 4}

The presence of a nonsense mutation in the dystrophin gene should be determined by genetic testing ^{Footnote 4}