Rev-Erb beta
Rev-Erb beta (NR1D2) is the paralog of REV-ERB alpha and shares its heme-dependent repression of RORE-containing clock genes, but differs in expression profile and physiological emphasis. NR1D2 is enriched in skeletal muscle, heart and brain rather than liver, and its expression oscillates in phase with circadian metabolic demand. Muscle studies implicate Rev-Erb beta in mitochondrial biogenesis, fatty acid oxidation and fiber-type regulation, while it also restrains inflammatory gene programs in macrophages alongside REV-ERB alpha. Because the two paralogs act redundantly in some tissues and distinctly in others, dual REV-ERB agonists are pursued for metabolic and inflammatory indications. Recombinant Rev-Erb beta supports corepressor recruitment assays and selectivity profiling of compounds that discriminate the paralogs.
