HLA class II histocompatibility antigen, DR beta 3 chain (HLA-DRB3*02:02) (HLA-DRB3*02:02)

HLA class II histocompatibility antigen, DR beta 3 chain (HLA-DRB3*02:02) is a specific allele of the HLA-DRB3 gene, which encodes the beta chain of the MHC class II DR52 molecule. In association with the HLA-DRA alpha chain, it forms a heterodimeric cell surface receptor primarily expressed on professional antigen-presenting cells such as dendritic cells, B cells, and macrophages. Its primary biological function involves the presentation of processed exogenous peptides to CD4+ T-helper cells, a critical step in initiating and regulating the adaptive immune response. This specific allele is highly relevant in clinical medicine due to its strong associations with autoimmune diseases, including type 1 diabetes and PLA2R-related membranous nephropathy, as well as its role in severe drug-induced adverse reactions. It serves as a pharmacogenomic marker for clozapine-induced agranulocytosis and delayed hypersensitivity to penicillin. Furthermore, HLA-DRB3*02:02 is increasingly utilized as a biomarker for patient selection in clinical trials for antigen-specific cancer immunotherapies, where it ensures compatibility between the treatment and the patient's immune system.

Other names

HLA-DRB3MHC class II antigen DRB3*02:02Human leukocyte antigen DRB3*02:02DR52bDRB3*0202

Antigen presentation to CD4+ T cells; HLA-restricted immune activation; Pharmacological interaction with immune receptors (p-i concept); Hapten-mediated immune response