ACTN3 and sarcopenia: On the other hand, genetic factors reported as sarcopenia biomarkers have also been identified such as angiotensin I-converting enzyme I (ACE), myostatin (MSTN), alpha actinin 3 (ACTN3), ciliary neurotrophic factor (CNTF), vitamin D receptor (VDR), insulin-like growth factor 1 (IGF1), and IL-6 [85].