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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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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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Histone Modifications in Mouse Pronuclei and Consequences for Embryo Development.

Ewa Borsuk1, Julia Michalkiewicz2, Jacek Z Kubiak3,4

  • 1Department of Embryology, Institute of Developmental Biology and Biomedical Sciences, Faculty of Biology, University of Warsaw, Warsaw, Poland. e.borsuk@uw.edu.pl.

Results and Problems in Cell Differentiation
|November 8, 2022
PubMed
Summary

Epigenetic reprogramming in mouse embryos involves crucial DNA methylation and histone modifications. Proper deposition of these epigenetic marks on maternal and paternal chromatin is essential for normal embryonic development.

Keywords:
Chromosome segregationEpigenetic marksGene expressionMaternal chromatinPaternal chromatinPreimplantation developmentZGAZygote

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Genomics

Background:

  • Epigenetic marks like DNA methylation and histone modifications regulate gene expression.
  • These marks are erased during gamete formation and re-established after fertilization in mice.
  • Asynchronous deposition and differential distribution on parental chromatin highlight complex regulatory mechanisms.

Purpose of the Study:

  • To review key epigenetic modifications during the first cell cycle of mouse embryos.
  • To emphasize the importance of epigenetic reprogramming for embryonic development.
  • To focus on DNA methylation, histone variants, acetylation, phosphorylation, and methylation.

Main Methods:

  • Literature review of epigenetic reprogramming in early mouse development.
  • Focus on specific epigenetic modifications: DNA methylation, histone variants, acetylation, phosphorylation, and methylation.
  • Analysis of chromatin dynamics on maternal and paternal genomes.

Main Results:

  • Epigenetic reprogramming, including DNA methylation and histone modifications, is critical post-fertilization.
  • Some epigenetic marks are deposited synchronously, while others are asynchronous or differentially distributed.
  • Proper establishment of these marks on both parental genomes is vital.

Conclusions:

  • Epigenetic reprogramming during the first cell cycle is essential for mouse embryonic development.
  • Correct deposition of DNA methylation and histone marks on maternal and paternal chromatin is crucial.
  • Understanding these processes is key to understanding normal embryonic development.