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Retinoid-X receptor action and disruption in development.

Brenda J Mengeling1, J David Furlow1

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|March 12, 2026
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Summary

Retinoid X receptor (RXR) is crucial for animal development, acting as a key partner for other nuclear receptors. This review explores RXR's ancient roles, its ligands, and how environmental chemicals can disrupt its signaling during development.

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Area of Science:

  • Developmental Biology
  • Molecular Endocrinology
  • Evolutionary Biology

Background:

  • Retinoid X receptor (RXR) is a vital nuclear receptor (NR) superfamily member.
  • RXR acts as an essential heterodimer partner for numerous other NRs, including RARs, TRs, VDR, and PPARs.
  • RXR is ancient, with roles in development across diverse metazoan lineages.

Purpose of the Study:

  • To review the diverse roles of RXRs in animal development, particularly in metamorphic genetic programs.
  • To explore the ongoing research into RXR's endogenous ligands and their requirement for RXR action.
  • To discuss mechanisms controlling RXR availability for NR partnership and the impact of environmental chemicals on RXR signaling.

Main Methods:

  • Literature review of existing studies on RXR function in animal development.
  • Analysis of evolutionary conservation of RXR across metazoan phyla.
  • Synthesis of current cellular data and environmental toxicology findings related to RXR.

Main Results:

  • RXR plays critical roles in developmental programs across the animal kingdom.
  • Understanding of RXR's endogenous ligands and their precise roles remains an active area of research.
  • Environmental chemicals can interfere with RXR signaling, potentially disrupting development.

Conclusions:

  • RXR is a fundamental regulator of animal development with ancient evolutionary origins.
  • Further research is needed to fully elucidate RXR ligand interactions and regulatory mechanisms.
  • Protecting against environmental disruptors of RXR signaling is important for healthy development.