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Related Concept Videos

Duplication of Chromatin Structure02:05

Duplication of Chromatin Structure

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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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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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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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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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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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Related Experiment Video

Updated: May 13, 2025

Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography
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Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography

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Chromatin as a Coevolutionary Graph: Modeling the Interplay of Replication with Chromatin Dynamics.

Sevastianos Korsak, Krzysztof H Banecki, Karolina Buka

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    Summary

    This study models DNA replication, exploring how replication, loop extrusion, and compartmentalization interact to shape chromatin folding. It reveals how these factors influence chromatin structure, especially under replication stress.

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    Area of Science:

    • Biophysics
    • Molecular Biology
    • Genomics

    Background:

    • Chromatin folding is crucial for genome regulation.
    • DNA replication, loop extrusion, and compartmentalization are key biophysical factors influencing chromatin structure.
    • Replication forks can impede loop extrusion and correlate with chromatin compartmentalization.

    Purpose of the Study:

    • To develop a novel computational framework integrating replication, loop extrusion, and compartmentalization.
    • To simulate and analyze the dynamic interplay of these factors in chromatin folding.
    • To investigate the impact of replication stress on chromatin dynamics and structure.

    Main Methods:

    • A numerical model simulating replication fork propagation using single-cell replication timing data.
    • Stochastic Monte Carlo simulations incorporating dynamic loop extrusion factors and static/moving barriers (CTCF, replication forks).
    • 3D OpenMM simulations to reconstruct chromatin structure based on simulated epigenetic states.

    Main Results:

    • The study presents the first framework to dynamically integrate and simulate replication, loop extrusion, and compartmentalization.
    • It provides insights into chromatin behavior during DNA replication.
    • The framework allows investigation into how replication stress alters chromatin dynamics and structure.

    Conclusions:

    • The integrated computational framework offers a novel approach to studying complex chromatin dynamics.
    • Understanding these biophysical interactions is essential for comprehending genome organization and function.
    • The model provides a basis for further research into DNA replication and its impact on chromatin architecture.