OAS1 and myopathy: Using microarrays, IFIG expression levels (including ISG5, Mx1, OAS1, IFIT4, IFIT1, IFI44, OAS3, OAS2, IRF7, and IFI27) in muscle samples were higher in DM than in other inflammatory myopathies, such as inclusion body myositis, polymyositis, necrotizing myopathy, and myopathies with inflammation [41].