Major histocompatibility complex, class II, DQ alpha 1 (HLA-DQ alpha 1 (commonly HLA-DQA1))

Major histocompatibility complex, class II, DQ alpha 1 (HLA-DQA1) is a gene encoding the alpha chain of an MHC class II molecule that forms a heterodimer with the DQ beta 1 chain (HLA-DQB1)[2]. This membrane protein complex is present on the surface of antigen-presenting cells such as dendritic cells, macrophages, and B cells; it binds to peptides derived from extracellular proteins, presenting them to CD4+ T lymphocytes and initiating adaptive immune responses[2][1]. The HLA-DQA1 gene is highly polymorphic, allowing for diverse peptide binding and influencing susceptibility to autoimmune diseases and transplant compatibility[2][3]. HLA-DQ molecules are not direct drug targets, but their role is critical in immunological diseases and as a biomarker in diagnostic testing[2].

Other names

HLA-DQA1DQ alpha 1HLA-DQα1Human leukocyte antigen DQ alpha 1

Not directly drug-targeted; drugs that modulate T cell activation or general immune function may indirectly affect this pathway