Nuclear receptor subfamily 1 group D member 1 and Nuclear receptor subfamily 1 group D member 2 (NR1D1 (REV-ERBα), NR1D2 (REV-ERBβ))

Nuclear receptor subfamily 1 group D member 1 (NR1D1, commonly known as REV-ERBα) and member 2 (NR1D2, or REV-ERBβ) are ligand-regulated nuclear transcription factors belonging to the nuclear receptor superfamily. Both proteins act as transcriptional repressors and serve as key regulators of the circadian clock by recruiting corepressor complexes to the promoter regions of target genes via specific DNA response elements. They lack a canonical activation domain (AF-2) and instead constitutively suppress gene transcription, impacting biological pathways involved in metabolism, inflammation, autophagy, cell development, and organ protection. NR1D1 is expressed from the opposite strand of the thyroid hormone receptor α gene (THRA), while NR1D2 is a closely related paralog. Both are highly conserved, broadly expressed, and are being evaluated as therapeutic targets for metabolic, inflammatory, and circadian-related disorders. Small molecule agonists (such as SR9009 and SR9011) are being developed to exploit their regulatory potential in several disease contexts[1][2][3][4][5][7].

Other names

REV-ERBαREV-ERB betaREV-ERBβNuclear receptor Rev-ErbA alphaNuclear receptor Rev-ErbA betaEAR-1, BMAL1 repressorNuclear receptor subfamily 1 group D members

Allosteric/agonist binding to the ligand-binding domain promotes corepressor recruitment, enhancing transcriptional repression - Ligand binding (including synthetic agonists or heme) modulates the receptor’s repressive function on target gene expression