HLA-DRA and sarcopenia: The transcription level of HLA‐DRA in skeletal muscle tissue (per 1 SD increase) was associated with lower ALM (beta: −0.09, 95% CI: −0.11 to −0.08, P = 5.4*10−36) and lower grip strength (OR: 1.13, 95% CI: 1.07–1.20, P = 1.8*10−5), indicating the increased risk of sarcopenia.