Retinoic acid receptor alpha, beta, gamma (RAR-α, RAR-β, RAR-γ)

Retinoic acid receptor alpha, beta, and gamma are members of the nuclear receptor superfamily, encoded by distinct genes (RARA, RARB, and RARG). These receptors are activated by retinoic acid, a metabolite of vitamin A, and regulate gene transcription involved in development, differentiation, cell proliferation, and apoptosis. Upon ligand binding, RARs form heterodimers with retinoid X receptors (RXRs), recruit coactivators, and drive expression of genes with retinoic acid response elements (RAREs). Expression and function of each RAR subtype can be tissue-specific, and they play both shared and unique roles in embryonic and adult physiology, disease processes, and as drug targets for retinoids (especially in cancer and dermatology). Resistance and toxicity are clinical challenges in retinoid-based therapies.

Other names

RAR-alphaRAR-αNR1B1RAR-betaRAR-βNR1B2RAR-gammaRAR-γNR1B3Retinoic acid receptor (RAR)Nuclear retinoic acid receptor

Ligand binding to RAR causes dissociation of corepressors (NCOR, SMRT), recruitment of coactivators, and transcriptional activation of target genes. Drives gene expression involved in cell cycle regulation, differentiation, and apoptosis