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Related Experiment Video

Updated: Jun 26, 2025

Quick Fluorescent In Situ Hybridization Protocol for Xist RNA Combined with Immunofluorescence of Histone Modification in X-chromosome Inactivation
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How does the Xist activator Rlim/Rnf12 regulate Xist expression?

Feng Wang1, Poonam Mehta1, Ingolf Bach1

  • 1Department of Molecular, Cell and Cancer Biology, University of Massachusetts Chan Medical School, Worcester, MA 01605, U.S.A.

Biochemical Society Transactions
|May 15, 2024
PubMed
Summary
This summary is machine-generated.

Rlim (Rnf12) activates Xist RNA for X chromosome inactivation (XCI). Its role in imprinted XCI is clear, but controversial in random XCI. Recent evidence suggests a regulatory switch in epiblasts reconciles Rlim

Keywords:
REX1Rlim/Rnf12X chromosome inactivationXist

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A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome
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Area of Science:

  • Epigenetics and Gene Regulation
  • Mammalian Embryogenesis
  • Non-coding RNA Biology

Background:

  • X chromosome inactivation (XCI) balances gene dosage between sexes in female mammals.
  • Xist long non-coding RNA (lncRNA) initiates XCI by silencing its chromosome of origin.
  • Rlim (E3 ubiquitin ligase) is implicated in Xist transcriptional activation.

Purpose of the Study:

  • To review the controversial role of Rlim in random XCI (rXCI).
  • To discuss evidence for a regulatory switch in Xist transcription during embryogenesis.
  • To reconcile the function of Rlim in both imprinted and random XCI.

Main Methods:

  • Review of existing literature on Rlim, Xist, and XCI.
  • Analysis of data regarding Xist regulation in mouse embryogenesis.
  • Focus on the transition from imprinted XCI (iXCI) to random XCI (rXCI).

Main Results:

  • Rlim's essential role in imprinted XCI (silencing the paternal X chromosome) is well-established.
  • Rlim's function in random XCI (in epiblast cells) has been debated.
  • Recent findings suggest a dynamic regulatory mechanism for Xist activation in epiblasts.

Conclusions:

  • A regulatory switch in Xist transcription partially explains Rlim's differential roles.
  • Understanding Rlim's function is key to comprehending XCI initiation and maintenance.
  • Further research is needed to fully elucidate Rlim's precise mechanisms in rXCI.