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. 1989 Jul;86(14):5310–5314. doi: 10.1073/pnas.86.14.5310

A third human retinoic acid receptor, hRAR-gamma.

A Krust 1, P Kastner 1, M Petkovich 1, A Zelent 1, P Chambon 1
PMCID: PMC297611  PMID: 2546152

Abstract

Retinoic acid receptors (RARs) are retinoic acid (RA)-inducible enhancer factors belonging to the superfamily of steroid/thyroid nuclear receptors. We have previously characterized two human RAR (hRAR-alpha and hRAR-beta) cDNAs and have recently cloned their murine cognates (mRAR-alpha and mRAR-beta) together with a third RAR (mRAR-gamma) whose RNA was detected predominantly in skin, a well-known target for RA. mRAR-gamma cDNA was used here to clone its human counterpart (hRAR-gamma) from a T47D breast cancer cell cDNA library. Using a transient transfection assay in HeLa cells and a reporter gene harboring a synthetic RA responsive element, we demonstrate that hRAR-gamma cDNA indeed encodes a RA-inducible transcriptional trans-activator. Interestingly, comparisons of the amino acid sequences of all six human and mouse RARs indicate that the interspecies conservation of a given member of the RAR subfamily (either alpha, beta, or gamma) is much higher than the conservation of all three receptors within a given species. These observations indicate that RAR-alpha, -beta, and -gamma may perform specific functions. We show also that hRAR-gamma RNA is the predominant RAR RNA species in human skin, which suggests that hRAR-gamma mediates some of the retinoid effects in this tissue.

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