Retinoic acid receptor alpha and Retinoic acid receptor beta (RAR-α (for alpha), RAR-β (for beta))

Retinoic acid receptor alpha and retinoic acid receptor beta are nuclear hormone receptors that function as ligand-activated transcription factors and mediate the effects of retinoic acid, a vitamin A derivative[1][5][9]. Both are modular proteins composed of domains for DNA binding and ligand (retinoid) binding, and they regulate gene expression by binding to promoter response elements (RAREs) as heterodimers with retinoid X receptors (RXR)[1][5][4]. The RAR-α and RAR-β proteins have critical roles in vertebrate development, cell differentiation, and homeostasis, as well as in certain malignancies and developmental diseases[5][9]. They are considered significant therapeutic targets for retinoid-based drugs, particularly in oncology and dermatology[1][5]. Selectivity among RAR subtypes is relevant for drug design due to differences in tissue distribution and biological function among the alpha, beta, and gamma isoforms[3][9].

Other names

Nuclear receptor subfamily 1 group B member 1 (NR1B1) for RAR-αNuclear receptor subfamily 1 group B member 2 (NR1B2) for RAR-βRARA for retinoic acid receptor alphaRARB for retinoic acid receptor betaRetinoic acid receptor alpha1, alpha2 (isoforms)RAR alpha, RAR beta

Modulation of gene expression by binding to retinoic acid response elements (RARE) on DNA, altering transcription of downstream genes Heterodimerization with retinoid X receptors (RXR) to mediate gene regulation Recruitment or displacement of corepressors/coactivators to influence chromatin structure and transcription