The anti-NXP2 autoantibody JDM subgroup has more notable myositis with MMT < 225/260 (2/5, 40%) and less photosensitivity (5/11, 45.5%), V-sign (1/11, 9.1%), and shawl sign (0/11, 0.0%). Here, MORC3 is linked to myositis disease.