ArticleCell reports2026
Selective control of HLA-DRB1 and HLA-DQA1 transcription through DR/DQ super enhancer microelements.
Article in Cell reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
MHC-II gene expression requires promoter-proximal and distal organizing elements. A super enhancer located between the HLA-DR and -DQ genes was dissected into five microdomains (regions A-E) to define its mechanism of action. Regions A and B were required for maximal expression of HLA-DQA1. Region A facilitated HLA-DQA1 expression and substituted for region B in its absence, as well as mediating longer-range interactions with distal CTCF sites. Region D modulated HLA-DRB1 through specific 3D chromatin interactions, whereas a local insulator element (XL9) broadly interacted with the SE. Through deletion of HLA-DRB1 proximal-promoter elements, HLA-DQ expression increased by co-opting interactions with region D, indicating that competition between microelements regulates the absolute levels of MHC-II genes. Together, these data define an additional layer of control for MHC-II genes encoded in one of the most polymorphic and disease-associated regions of the human genome.
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