In Caucasians, associations of HLA-DQA1*0501 and -DQB1*0301, -DRB1*03, and -DRB1*08 with GD and of HLA-DRB1*03, -DRB1*04, -DRB1*08, -DQA1*03011/12, -DQA1*0401, and -DQB1*0301/4 with HD were reported [4, 5]. Here, HLA-DQA1 is linked to Huntington disease.