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Updated: Jan 3, 2026

Combined DNA-RNA Fluorescent In situ Hybridization FISH to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells
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Rlim/Rnf12, Rex1, and X Chromosome Inactivation.

Feng Wang1, Ingolf Bach1

  • 1Department of Molecular, Cell and Cancer Biology, University of Massachusetts Medical School, Worcester, MA, United States.

Frontiers in Cell and Developmental Biology
|November 19, 2019
PubMed
Summary

RLIM/Rnf12, an E3 ubiquitin ligase, plays a key role in X chromosome inactivation (XCI). This study clarifies its functions and interactions with Rex1 during this crucial gene regulation process.

Keywords:
RLIMRex1Rnf12XCIXist regulationmouse genetics

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genetics

Background:

  • RLIM/Rnf12 is an E3 ubiquitin ligase and transcriptional cofactor.
  • It modulates transcription factor activity and protein complex recruitment.
  • RLIM/Rnf12 was identified as a key regulator of X chromosome inactivation (XCI).

Purpose of the Study:

  • To discuss the cellular and developmental functions of RLIM/Rnf12 as an E3 ubiquitin ligase.
  • To clarify the controversial roles of RLIM/Rnf12 during XCI.
  • To examine the interaction between RLIM/Rnf12 and its target protein Rex1 in XCI.

Main Methods:

  • Literature review and synthesis of existing research on RLIM/Rnf12.
  • Analysis of RLIM/Rnf12's function as an E3 ubiquitin ligase.
  • Investigation of RLIM/Rnf12's role in X chromosome inactivation (XCI) and its interaction with Rex1.

Main Results:

  • RLIM/Rnf12 exhibits diverse cellular and developmental functions.
  • Its precise roles in XCI have been debated.
  • The interaction with Rex1 is crucial for understanding RLIM's function in XCI.

Conclusions:

  • RLIM/Rnf12 is a critical E3 ubiquitin ligase with significant roles in gene regulation.
  • Further research is needed to fully elucidate RLIM/Rnf12's complex functions in XCI.
  • Understanding RLIM/Rnf12-Rex1 interactions is key to advancing knowledge of XCI mechanisms.