HLA-DQB1 and Parkinson disease: It was found that increased expression of seven HLA genes (HLA-B, HLA-C, HLA-DQA1, HLA-DQB1, HLA-DQB1-AS1, HLA-DRB1 and HLA-DRB5) and decreased expression of four genes (HLA-DOB, HLA-DQA2, HLA-DQB2 and HLA-DRB6) is associated with the risk of PD [43].