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Related Concept Videos

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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Related Experiment Video

Updated: Mar 25, 2026

A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome
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Reprogramming the inactive X chromosome: dynamics and insights from the germline.

Yolanda Moyano Rodriguez1, Maud Borensztein1

  • 1IGMM, Univ Montpellier, CNRS, Montpellier, France.

Biochemical Society Transactions
|March 24, 2026
PubMed
Summary

X-chromosome reactivation (XCR) in female germline reprogramming resets the inactive X chromosome. This process is crucial for oocyte development and reproduction, though its full importance is still being explored.

Keywords:
X-chromosome inactivationdosage compensationepigenetic reprogrammingmethylationmonoallelic expressionprimordial germ cells

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Genetics

Background:

  • Germline reprogramming resets the epigenome for gamete formation.
  • Female primordial germ cells (PGCs) undergo X-chromosome reactivation (XCR) to re-express genes from the inactive X chromosome.
  • XCR is essential for female germline development and reproduction, but its functional importance is not fully understood.

Purpose of the Study:

  • To review recent advances in understanding X-chromosome reactivation (XCR) dynamics in mammalian PGCs.
  • To synthesize current knowledge on XCR during germline epigenetic reprogramming.
  • To identify knowledge gaps and future research directions in XCR.

Main Methods:

  • Review of in vivo and in vitro studies on XCR in PGCs.
  • Integration of data from low-input and single-cell omics technologies.
  • Comparative analysis across species including mice, humans, and non-human primates.

Main Results:

  • XCR involves loss of XIST/Xist coating, DNA demethylation, and gene re-expression from the inactive X chromosome.
  • XCR occurs progressively during PGC differentiation from emergence to meiosis.
  • Recent omics technologies have significantly improved the characterization of XCR dynamics.

Conclusions:

  • XCR is a critical epigenetic reprogramming event in female germ cells.
  • Further research is needed to fully elucidate the functional significance of XCR for fertility.
  • Understanding XCR dynamics is key to advancing germline epigenetic reprogramming research.