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Updated: May 4, 2026

Prediction and Validation of Gene Regulatory Elements Activated During Retinoic Acid Induced Embryonic Stem Cell Differentiation
Published on: June 21, 2016
A direct repeat in the cellular retinol-binding protein type II gene confers differential regulation by RXR and RAR
D J Mangelsdorf1, K Umesono, S A Kliewer
1Howard Hughes Medical Institute, La Jolla, California 92186-5800.
Abstract:
The vitamin A derivative retinoic acid exerts its effects on transcription through two distinct classes of nuclear receptors, the retinoic acid receptor (RAR) and the retinoid X receptor (RXR). We provide evidence that expression of the gene for cellular retinol-binding protein type II (CRBPII), a key protein in the intestinal absorption of vitamin A, is dramatically up-regulated by retinoic acid in the presence of RXR but not RAR. This regulation is conferred through a specific cis element in the CRBPII promoter that contains five nearly perfect tandem repeats of the sequence AGGTCA spaced by a single nucleotide. The discovery of this new RX response element provides a means for distinguishing between the two retinoid receptor systems and suggests that an RXR-mediated pathway exists for modulating vitamin A metabolism.
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