A resent genome-wide association study has identified several shared loci (including HLA-DRB5, LRRK2, and MAPT) between PD and 7 autoimmune diseases (including psoriasis, rheumatoid arthritis, and so on), suggesting that there were some common genetic risks between PD and autoimmune diseases [26]. The gene discussed is HLA-DRB5; the disease is Parkinson disease.