Retinoic acid receptor alpha, Retinoic acid receptor beta, Retinoic acid receptor gamma (RARα, RARβ, RARγ)

Retinoic acid receptors comprise three isotypes (alpha, beta, gamma), each encoded by separate genes (RARA, RARB, RARG), and act as nuclear hormone receptors for retinoic acid, a vitamin A derivative. As ligand-activated transcription factors, these receptors regulate genes involved in cell growth, differentiation, and development, acting primarily through heterodimerization with retinoid X receptors (RXRs) and binding to retinoic acid response elements on DNA. Their distinct transcriptional activities and interaction profiles contribute to both overlapping and unique physiological effects, and mutations or disruptions in their function are associated with disease, most notably several forms of cancer. Drugs targeting RARs modulate retinoid signaling for the treatment of malignancies and other disorders linked to dysregulated cell differentiation and proliferation.

Other names

Retinoic acid receptor alpha (NR1B1, RARA)Retinoic acid receptor beta (NR1B2, RARB)Retinoic acid receptor gamma (NR1B3, RARG)RARα, RARβ, RARγ

Ligand (retinoic acid or synthetic analog) binds to receptor, inducing conformational change - Dissociation of corepressor complex (NCOR1, SMRT, HDAC), recruitment of coactivator complex - Initiation of target gene transcription - Antagonists block retinoic acid binding, thereby repressing transcriptional activation