Which chromosome carries the genes for HLA class II molecules in humans?

Which chromosome carries the genes for HLA class II molecules in humans?

• A. Chromosome 9
• B. Chromosome 6
• C. Chromosome X
• D. Chromosome 1

Answer: (B)

HLA class II genes are located in the major histocompatibility complex (MHC) region on chromosome 6, specifically in the 6p21.3 area, including the HLA-DP, HLA-DQ, and HLA-DR loci. This clustering means chromosome 6 carries the genes for these molecules. HLA class II proteins are expressed on antigen-presenting cells and present extracellular peptides to CD4+ T helper cells, a central step in initiating immune responses. The MHC region on chromosome 6 is the canonical location for these genes, while other chromosomes do not house these class II gene clusters, making chromosome 6 the correct chromosome.

HLA class II genes are located in the major histocompatibility complex (MHC) region on chromosome 6, specifically in the 6p21.3 area, including the HLA-DP, HLA-DQ, and HLA-DR loci. This clustering means chromosome 6 carries the genes for these molecules. HLA class II proteins are expressed on antigen-presenting cells and present extracellular peptides to CD4+ T helper cells, a central step in initiating immune responses. The MHC region on chromosome 6 is the canonical location for these genes, while other chromosomes do not house these class II gene clusters, making chromosome 6 the correct chromosome.