Splicing factor proline/glutamine-rich is a novel autoantigen of dermatomyositis and associated with anti-melanoma differentiation-associated gene 5 antibody
SFPQ is a novel autoantigen for dermatomyositis (DM). All anti-MDA5-positive patients who showed recurrence of DM/CADM had anti-SFPQ. Diagnosis timing had seasonality according to the timing of anti-SFPQ appearance.