IRF5 and Schwartz-Jampel syndrome: Additionally, several genes, including BLK (B lymphoid tyrosine kinase), STAT4 (signal transducer and activator of transcription 4), CXCR5 (C-X-C chemokine receptor type 5), IL12A (interleukin-12 subunit alpha), TNIP1 (TNFAIP3-interacting protein 1), and IRF5 (interferon regulatory factor 5), have been suggested as potential gene candidates for susceptibility to SjS in various studies (92).