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Major histocompatibility complex, class II, DQ alpha 2
External IDs OMIM613503 HomoloGene134076 GeneCards: HLA-DQA2 Gene
RNA expression pattern
PBB GE HLA-DQA2 212671 s at tn.png
More reference expression data
Species Human Mouse
Entrez 3118 n/a
Ensembl ENSG00000206301 n/a
UniProt P01906 n/a
RefSeq (mRNA) NM_020056 n/a
RefSeq (protein) NP_064440 n/a
Location (UCSC) Chr 6:
32.74 – 32.75 Mb
PubMed search [1] n/a

HLA class II histocompatibility antigen, DQ(6) alpha chain is a protein that in humans is encoded by the HLA-DQA2 gene. Also known as HLA-DXA or DAAP-381D23.2, it is part of the human leucocyte antigen system.[1]

The protein encoded by this gene is expressed, but unlike HLA-DQA1, it apparently unable to heterodimerize with HLA class II beta chain paralogues.[2] The low level of HLA-DQA2 expression is apparently due to impaired transcription factor binding to the HLA-DQA2 gene promoter.[3]


  1. ^ "Entrez Gene: HLA-DQA2 major histocompatibility complex, class II, DQ alpha 2". 
  2. ^ Rudy GB, Lew AM (March 1997). "The nonpolymorphic MHC class II isotype, HLA-DQA2, is expressed on the surface of B lymphoblastoid cells". J. Immunol. 158 (5): 2116–25. PMID 9036956. 
  3. ^ Indovina P, Megiorni F, Fontemaggi G, Coni P, Mora B, Mazzilli MC (May 2001). "Absence of in vivo DNA-protein interactions in the DQA2 and DQB2 promoter regions". Hum. Immunol. 62 (5): 504–8. doi:10.1016/S0198-8859(01)00236-1. PMID 11334674. 

Further reading[edit]