HLA-DPA1 (Major Histocompatibility Complex, Class II, DP Alpha 1): The HLA-DPA1 gene is a part of the human leukocyte antigen (HLA) system, which plays a critical role in the immune system. Specifically, this gene is involved in the presentation of peptides derived from extracellular proteins to T cells. Its importance lies in immune response regulation and its association with various autoimmune diseases. The diversity of alleles in the HLA-DPA1 gene is key to the adaptive immune response, making it a significant focus in transplant medicine, autoimmune disease research, and vaccine response studies....