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Retinoic acid receptor beta (RARB) and Retinoic acid receptor gamma (RARG) (RAR-β (RARB), RAR-γ (RARG))

Target: RAR-β (RARB), RAR-γ (RARG)
Molecular classification: Receptor, Nuclear receptor, Transcription factor

Overview

Retinoic acid receptor beta and retinoic acid receptor gamma are ligand-activated nuclear receptors encoded by the RARB and RARG genes, respectively. They function as transcription factors that heterodimerize with retinoid X receptors (RXRs) to bind DNA at retinoic acid response elements, regulating gene expression in response to retinoic acid. These receptors are critical in cell differentiation, morphogenesis, development, and tissue homeostasis. RAR-beta and RAR-gamma display distinct transcriptional activities, with RAR-gamma specifically implicated as a key mediator of the clinical and pharmacological effects of certain retinoids such as adapalene. Alterations in their activity or expression are implicated in cancer and various developmental disorders[1][2][3][4][5][6].

Other names: RAR-beta (RARB)RAR-gamma (RARG)NR1B2 (for RAR-beta)NR1B3 (for RAR-gamma)Retinoic acid receptor-βRetinoic acid receptor-γ

Mechanism of action

Ligand (retinoid)-dependent activation of nuclear receptor leading to transcriptional regulation of target genes

Biological functions

Signal transductionRegulation of gene expressionCell differentiationMorphogenesisDevelopment

Disease associations

CancerDevelopmental disordersPreeclampsiaOther disorders related to differentiation and morphogenesis

Safety considerations

Risk of teratogenic effects with ligand agonists (particularly during pregnancy)Potential for promoting or inhibiting differentiation linked to cancer cell proliferationAdverse effects with systemic retinoids (mucocutaneous, hepatic, skeletal)

Interacting drugs

Adapalene

2 more in the full profile.

Biomarkers

RARB and RARG expression levels may be used as biomarkers in oncology and developmental disorders, though explicit clinical biomarkers are not widely established; research is ongoing

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