The respiratory chain and energy transfer proteins, such as NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 4 (NDUFA4), Cytochrome b‐c1 complex subunit 2 (UQCRC2), Cytochrome c1 (CYC1), Chaperone activity of bc1 complex‐like (ADCK3), Creatine kinase M‐type (CKM), AMP deaminase 1 (AMPD1), and ADP/ATP translocase 1 (SLC25A4), were decreased in DMD. This evidence concerns the gene CYC1 and Duchenne muscular dystrophy.