RAR-related orphan receptor A (RORA)

RAR-related orphan receptor A (RORA) is a member of the nuclear receptor superfamily (NR1F1) that functions as a ligand-dependent transcription factor [1, 4]. It plays a pivotal role in the mammalian molecular clock by regulating the rhythmic expression of Bmal1 and other core circadian genes [1, 9]. Beyond its chronobiological function, RORA is essential for the development of the cerebellum, the maturation of Purkinje cells, and the differentiation of type 2 innate lymphoid cells (ILC2) [1, 13]. It also regulates critical metabolic pathways, including lipid and glucose homeostasis, and modulates inflammatory responses by inhibiting NF-kappaB signaling [2, 11]. In clinical contexts, RORA is implicated in diverse diseases such as autism spectrum disorder, metabolic syndrome, and cardiovascular diseases such as atherosclerosis [2, 5, 11]. In many cancers, it acts as a tumor suppressor; its downregulation is associated with increased proliferation and poor outcomes in breast, lung, and prostate cancers [2, 3]. Pharmacological targeting of RORA involves synthetic small molecules, including agonists like SR1078 and inverse agonists like SR3335, which modulate its transcriptional activity by recruiting co-activators or co-repressors [1, 11]. However, the pleiotropic nature of RORA across multiple organ systems and its fundamental role in circadian rhythmicity pose significant therapeutic challenges regarding systemic safety and potential off-target effects [2, 12].

Other names

Retinoic acid receptor-related orphan receptor alphaRetinoid-related orphan receptor alphaROR-alphaNuclear receptor subfamily 1 group F member 1NR1F1Nuclear receptor RZR-alphaRZRAROR1ROR2ROR3

Ligand-dependent transcriptional activation or repression via binding to ROR-response elements (ROREs) as a monomer or homodimer; agonists promote co-activator recruitment while inverse agonists promote co-repressor recruitment.