Increasing evidence suggests that the cGAS-STING signaling pathway plays a key pathogenic role in autoimmune diseases such as systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), Aicardi-Goutières syndrome (AGS), and STING-associated vasculopathy with onset in infancy (SAVI). Here, CGAS is linked to rheumatoid arthritis.