Through colocalisation analysis, we found colocalisation‐mapped genes, including BAG6, GPSM3, PRRC2A, PSMB8, RNF5, NELFE, AGER, PBX2 and AIF1, which are common to RA, AS, SLE and SS (Figure 5a). Here, PSMB8 is linked to rheumatoid arthritis.