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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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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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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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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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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Dissecting Mechanisms of Epigenetic Memory Through Computational Modeling.

Amy Briffa1,2, Govind Menon1, Ander Movilla Miangolarra1

  • 1Department of Computational and Systems Biology, John Innes Centre, Norwich Research Park, Norwich, United Kingdom;

Annual Review of Plant Biology
|February 29, 2024
PubMed
Summary
This summary is machine-generated.

Computational modeling aids in understanding complex epigenetic memory mechanisms. This review highlights advances in gene regulatory networks, DNA methylation, and histone modifications, particularly in plant systems.

Keywords:
DNA methylation dynamicscomputational modelingepigenetic memorygene regulatory networkshistone modificationsstochastic simulations

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Area of Science:

  • Molecular Biology
  • Systems Biology
  • Computational Biology

Background:

  • Epigenetic memory, crucial for cellular function, is complex to understand mechanistically.
  • Dissecting the establishment and maintenance of epigenetic memory requires advanced approaches.

Purpose of the Study:

  • To review the role of computational modeling in elucidating epigenetic memory.
  • To focus on gene regulatory networks, DNA methylation, and histone modifications.
  • To highlight the utility of plant systems for studying epigenetic memory.

Main Methods:

  • Review of computational modeling approaches applied to epigenetic memory.
  • Analysis of feedback dynamics in gene regulatory networks.
  • Examination of DNA methylation and histone modification models.

Main Results:

  • Computational modeling offers powerful tools for dissecting complex epigenetic feedback dynamics.
  • Plant systems provide advantages for experimental validation of computational models.
  • Iterative cycles of modeling and experimentation have led to conceptual advances.

Conclusions:

  • Computational modeling is essential for unlocking the complexity of epigenetic memory.
  • Intertwined theoretical and experimental approaches are needed to resolve remaining knowledge gaps.