MFN1 and Atrophy: Previous studies using muscle‐specific knockout of mitofusin 1 (Mfn1) and Mfn2, which are involved in mitochondrial fusion (Chen et al., 2010), and dynamin‐related protein 1 (Drp1), which is involved in mitochondrial fission (Dulac et al., 2020), showed severe muscle atrophy in both animal models, suggesting that mitochondrial dynamics are important not only for efficient energy production but also for the maintenance of skeletal muscle mass.