In DM sera, one sample each was positive for anti-SRP, anti-Mi-2, anti-NXP2, anti-cN-1A, co-positive for anti-SAE1/anti-Ro52/anti-Ku, and co-positive for anti-SAE1/anti-Ro52 and two samples were negative for MSA and MAA. Here, TRIM21 is linked to dermatomyositis.