The relationship between DJ-1 protein and meat quality traits is scarcely reported, but post-mortem changes of DJ-1 protein are correlated to Warner-Bratzler shear force, drip loss and meat color. Muscles with a lighter meat had increased abundance of DJ-1 protein, but its effect on tenderness was not clearly demonstrated. Chelh showed an up-regulation of DJ-1 protein in MSTN-null mice. Consequently, juiciness may be negatively correlated with this protein. However, juiciness was not significantly different between DM and non-DM British South Devon cattle, but there was a tread for a lower juiciness in DM animals