COX7A1 and dilated cardiomyopathy: In addition, this protein plays an important role in the super‐assembly that integrates peripherally into multi‐unit heteromeric complexes in the mitochondrial respiratory chain.4, 5 The generation of mitochondrial energy is essential for the function of cardiac tissue, and some researchers have found that the mice lacking both homozygous and heterozygous heart‐type COX7A1 develop dilated cardiomyopathy at 6 weeks of age,6 indicating the key position of COX7A1 in energy generation and metabolism.