GDF5 and sarcopenia: Muscle weakness GWAS results, as another important determinant of sarcopenia, were associated with major histocompatibility complex, class II, DQ Alpha 1 (HLA‐DQA1), growth/differentiation factor 5 (GDF5), and dymeclin (DYM) variants, and the analysis results pointed out a causal link between several chronic disorders and muscle weakness.101