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Xist condensates: perspectives for therapeutic intervention.

Irene Perotti1, Laura Broglia2, Gian Gaetano Tartaglia3

  • 1Unit of Cell and Developmental Biology, Department of Biology, Università di Pisa, Strada Statale dell'Abetone Brennero, 4, Pisa, 56123, Italy.

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|July 21, 2025
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Summary

X-chromosome inactivation uses Xist RNA to silence one X chromosome in females. Molecular crowding via liquid-liquid phase separation (LLPS) is key to this process, offering new therapeutic targets.

Keywords:
Condensate-modifying therapeuticsCondensatesLiquid-liquid phase separationRNA-binding proteinsX-chromosome inactivationX-linked disordersX-reactivationXist

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Area of Science:

  • Genetics
  • Molecular Biology
  • Epigenetics

Background:

  • X-chromosome inactivation (XCI) is essential for dosage compensation in female mammals.
  • The long noncoding RNA Xist initiates XCI by coating one X chromosome.
  • Molecular crowding, particularly liquid-liquid phase separation (LLPS), is increasingly recognized as vital for Xist function.

Purpose of the Study:

  • To provide a comprehensive perspective on the molecular mechanisms of XCI.
  • To highlight the role of LLPS in Xist RNA-driven condensate formation.
  • To explore the therapeutic potential of targeting LLPS in XCI.

Main Methods:

  • Literature review and integration of existing knowledge.
  • Analysis of emerging evidence on molecular crowding and LLPS in gene regulation.
  • Conceptual framework development for XCI mechanisms.

Main Results:

  • Xist RNA-mediated condensates, driven by LLPS, are critical for establishing and maintaining X-chromosome silencing.
  • Molecular crowding influences the biophysical properties of Xist condensates.
  • LLPS provides a physical mechanism for concentrating regulatory factors on the X chromosome.

Conclusions:

  • LLPS is a fundamental mechanism underlying XCI.
  • Understanding Xist-driven LLPS offers insights into gene silencing.
  • Targeting LLPS presents novel therapeutic strategies for diseases associated with XCI.
  • This work integrates current understanding and future directions in XCI research.