HLA-DQA2

Protein-coding gene in the species Homo sapiens

HLA-DQA2

Identifiers

Aliases

HLA-DQA2, DX-ALPHA, HLA-DXA, HLA-DQA2 (gene), major histocompatibility complex, class II, DQ alpha 2, DC-alpha, HLA-DCA, DQA1

External IDs

OMIM: 613503; MGI: 95895; HomoloGene: 134076; GeneCards: HLA-DQA2; OMA:HLA-DQA2 - orthologs

Gene location (Human)

Chr.	Chromosome 6 (human)^[1]

Band	6p21.32	Start	32,741,391 bp^[1]
Band	6p21.32	End	32,747,198 bp^[1]

Gene location (Mouse)

Chr.	Chromosome 17 (mouse)^[2]

Band	17 B1\|17 17.98 cM	Start	34,501,718 bp^[2]
Band	17 B1\|17 17.98 cM	End	34,506,797 bp^[2]

RNA expression pattern

Bgee

Human

Mouse (ortholog)

Top expressed in

granulocyte

appendix

testicle

lymph node

duodenum

spleen

right coronary artery

upper lobe of left lung

right lung

mucosa of transverse colon

Top expressed in

spleen

mesenteric lymph nodes

Paneth cell

thymus

submandibular gland

right lung

right lung lobe

tunica adventitia of aorta

skin of external ear

superior surface of tongue

More reference expression data

BioGPS


More reference expression data

Gene ontology
Molecular function	MHC class II receptor activity
Cellular component	integral component of membrane endocytic vesicle membrane clathrin-coated endocytic vesicle membrane endosome Golgi apparatus trans-Golgi network membrane endoplasmic reticulum membrane membrane Golgi membrane plasma membrane transport vesicle membrane integral component of plasma membrane MHC class II protein complex lysosomal membrane endoplasmic reticulum ER to Golgi transport vesicle membrane lysosome integral component of lumenal side of endoplasmic reticulum membrane endosome membrane
Biological process	antigen processing and presentation antigen processing and presentation of exogenous peptide antigen via MHC class II interferon-gamma-mediated signaling pathway immune system process antigen processing and presentation of peptide or polysaccharide antigen via MHC class II immune response T cell receptor signaling pathway adaptive immune response
Sources:Amigo / QuickGO

Orthologs

Species

Human

Mouse

Entrez


3118


14960

Ensembl

ENSG00000231823 ENSG00000206301 ENSG00000257473 ENSG00000231526 ENSG00000225103
ENSG00000237541 ENSG00000223793 ENSG00000233192


ENSMUSG00000036594

UniProt


P01906

P14434 P14437 P01910 P14435 P14438
P04228 P14436 P04227

RefSeq (mRNA)


NM_020056


NM_010378

RefSeq (protein)


NP_064440


NP_034508

Location (UCSC)

Chr 6: 32.74 – 32.75 Mb

Chr 17: 34.5 – 34.51 Mb

PubMed search

^[3]

^[4]

Wikidata

View/Edit Human

View/Edit Mouse

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 leukocyte antigen system.^[5]

The protein encoded by this gene is expressed, but unlike HLA-DQA1, it is apparently unable to heterodimerize with HLA class II beta chain paralogues.^[6] The low level of HLA-DQA2 expression is apparently due to impaired transcription factor binding to the HLA-DQA2 gene promoter.^[7]

COVID-19

Transcriptome analysis of blood immune cells and nasopharyngeal cells before elaborate infection of study participants revealed that heightened expression of HLA-DQA2 correlates to a significantly lower chance of COVID-19 successfully infecting the individual.^[8]

References

^ ^a ^b ^c ENSG00000206301, ENSG00000257473, ENSG00000231526, ENSG00000225103, ENSG00000237541, ENSG00000223793, ENSG00000233192 GRCh38: Ensembl release 89: ENSG00000231823, ENSG00000206301, ENSG00000257473, ENSG00000231526, ENSG00000225103, ENSG00000237541, ENSG00000223793, ENSG00000233192 – Ensembl, May 2017
^ ^a ^b ^c GRCm38: Ensembl release 89: ENSMUSG00000036594 – Ensembl, May 2017
^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
^ "Entrez Gene: HLA-DQA2 major histocompatibility complex, class II, DQ alpha 2".
^ Rudy GB, Lew AM (March 1997). "The nonpolymorphic MHC class II isotype, HLA-DQA2, is expressed on the surface of B lymphoblastoid cells". Journal of Immunology. 158 (5): 2116–2125. doi:10.4049/jimmunol.158.5.2116. PMID 9036956.
^ 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". Human Immunology. 62 (5): 504–508. doi:10.1016/S0198-8859(01)00236-1. PMID 11334674.
^ Lindeboom RG, Worlock KB, Dratva LM, Yoshida M, Scobie D, Wagstaffe HR, et al. (July 2024). "Human SARS-CoV-2 challenge uncovers local and systemic response dynamics". Nature. 631 (8019): 189–198. doi:10.1038/s41586-024-07575-x. PMC 11222146. PMID 38898278.

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Trowsdale J, Lee J, Carey J, Grosveld F, Bodmer J, Bodmer W (April 1983). "Sequences related to HLA-DR alpha chain on human chromosome 6: restriction enzyme polymorphism detected with DC alpha chain probes". Proceedings of the National Academy of Sciences of the United States of America. 80 (7): 1972–1976. Bibcode:1983PNAS...80.1972T. doi:10.1073/pnas.80.7.1972. PMC 393734. PMID 6300884.
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