Aryl hydrocarbon receptor nuclear translocator (ARNT)

Aryl hydrocarbon receptor nuclear translocator (ARNT, HIF-1β) is a bHLH-PAS transcription factor that heterodimerizes with ligand-activated AHR to bind xenobiotic response elements and induce genes in xenobiotic metabolism, and also serves as the beta subunit of HIF-1, partnering with HIF-1α to mediate hypoxia-responsive transcription; ARNT is essential for canonical AHR signaling, is implicated in cancer biology and hematopoiesis, and chromosomal translocations involving ARNT (e.g., TEL–ARNT) have been linked to acute myeloblastic leukemia.

Other names

ARNTHIF-1 betaHIF1βHIF-1βHIF1BHIF1-betaClass E basic helix-loop-helix protein 1bHLH-PAS protein ARNTHIF-1 subunit beta

AHR agonists: ligand binds AHR, AHR translocates to nucleus, heterodimerizes with ARNT (HIF1β), and the AHR–ARNT complex binds XREs to regulate target gene transcription (canonical AHR signaling); AHR antagonists/modulators: reduce AHR–ARNT-driven transcription by preventing AHR activation or dimerization, decreasing XRE binding and downstream gene expression; HIF pathway modulators: agents that alter HIF-α stability or activity affect ARNT-dependent HIF transcriptional complexes, modulating hypoxia-responsive genes.