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Related Concept Videos

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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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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Chromosomal Theory of Inheritance01:39

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In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
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Histone Modification02:32

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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.
Acetylation
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Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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Updated: Jun 10, 2025

Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography
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Replication-coupled inheritance of chromatin states.

Aoqun Song1,2,3,4, Yunting Wang1, Cuifang Liu2,3

  • 1New Cornerstone Science Laboratory, Frontier Science Center for Immunology and Metabolism, Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Taikang Center for Life and Medical Sciences, Wuhan University, Wuhan, 430072, China.

Cell Insight
|October 11, 2024
PubMed
Summary

Maintaining cell fate relies on faithful chromatin inheritance during eukaryote development. This review details how DNA replication, nucleosome assembly, and chromatin maturation ensure epigenome stability, highlighting key factors and future research directions.

Keywords:
ChromatinDNA replicationEpigenetic inheritanceHistone modifications

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Cell Biology

Background:

  • Faithful inheritance of chromatin states is crucial for maintaining cell fate during eukaryote development.
  • DNA replication disrupts nucleosomes, posing a challenge to maintaining chromatin state inheritance.
  • Numerous factors coordinate to preserve the epigenome during DNA replication.

Purpose of the Study:

  • To summarize mechanisms of replication-coupled nucleosome assembly and post-replication chromatin maturation.
  • To highlight the inheritance of chromatin states and the epigenome during DNA replication.
  • To discuss future directions and challenges in epigenome maintenance.

Main Methods:

  • Review of existing literature on DNA replication and chromatin dynamics.
  • Analysis of the roles of DNA polymerases, histone chaperones, RNA Pol II, and histone modifying enzymes.
  • Synthesis of information on replication-coupled nucleosome assembly and chromatin maturation.

Main Results:

  • Detailed mechanisms of how chromatin states are inherited during DNA replication are elucidated.
  • The coordination of various factors in maintaining the epigenome during replication is highlighted.
  • Key processes include replication-coupled nucleosome assembly and post-replication chromatin maturation.

Conclusions:

  • Understanding replication-coupled chromatin dynamics is essential for cell fate maintenance.
  • The epigenome is dynamically maintained through coordinated molecular mechanisms during replication.
  • Further research is needed to address challenges in understanding and manipulating chromatin inheritance.