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Involved in adaptive response to hypoxia. Suppresses hypoxia-inducible expression of HIF1A and EPAS1. Binds to core DNA sequence 5'-TACGTG-3' within the hypoxia response element (HRE) of target gene promoters. The complex HIF3A-ARNT activates the transcription of reporter genes driven by HRE. Isoform 4 has a dominant-negative function of inactivating HIF1A-mediated transcription. Isoform 4 attenuates the binding of HIF1A to hypoxia-responsive elements (HRE), thus inhibiting HRE-driven transcription. Hypoxia induces down-regulation of isoform 4, leading to activation of HIF1A in hypoxia. Conversely, upon restoring normoxia, the expression of isoform 4 increases and thereby secure an inhibition of HIF1A activity. Isoform 4 may be a negative regulator of hypoxia-inducible gene expression in the kidney and may be involved in renal tumorigenesis. Functions as an inhibitor of angiogenesis in the cornea.
Gene Name: | hypoxia inducible factor 3, alpha subunit |
Synonyms: | HIF3A, BHLHe17, HIF-3A, IPAS, HIF3-alpha-1, Inhibitory PAS domain protein, PASD7, HIF-3-alpha, HIF3-alpha, Member of PAS protein 7, MOP7 |
Target Sequences: | NM_152795 NP_690008.2 Q9Y2N7 |
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