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A human retinoic acid receptor gamma isoform is homologous to the murine retinoic acid receptor gamma 7.

The nuclear receptors for all-trans retinoic acid belong to a superfamily of ligand-activated transcription factors that interact specifically with hormone responsive DNA elements located in the promoter regions of the target genes (for review see Ref. 1). Three forms of RAR (RAR-u, 0 and -y) encoded by distinct genes have been cloned from mammalian species (1). For the RAR--y gene, five isoforms have been isolated from human (hRAR-'y) and seven isoforms have been isolated from mouse (mRAR--y) so far (2, 3). These isoforms were all found to differ in their 5' untranslated region or N-terminal protein-coding sequences and were generated by alternative splicing. Here we report the molecular cloning and tissue distribution of a new RAR--y isoform from human skin fibroblasts.