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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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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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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 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.
Writers
The writer...
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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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Chromatin organization and DNA damage.

Katsuhiko Minami1, Shiori Iida1, Kazuhiro Maeshima1

  • 1Genome Dynamics Laboratory, National Institute of Genetics, Research Organization of Information and Systems (ROIS), Shizuoka, Japan; Department of Genetics, School of Life Science, SOKENDAI (Graduate University for Advanced Studies), Shizuoka, Japan.

The Enzymes
|November 6, 2022
PubMed
Summary
This summary is machine-generated.

Cells maintain genome integrity by compacting chromatin into dynamic domains. Following DNA damage, these domains decompact, increasing DNA accessibility for efficient repair.

Keywords:
Chromatin domainChromatin motionDNA damageDamage responseSingle-nucleosome imaging

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Area of Science:

  • Genomics
  • Cell Biology
  • Molecular Biology

Background:

  • Genomic DNA is organized into three-dimensional chromatin structures within the nucleus.
  • Chromatin organizes into dynamic domains, crucial for DNA replication and gene regulation.
  • Maintaining genome integrity is vital for cellular health and division, despite constant DNA damage threats.

Purpose of the Study:

  • To investigate how chromatin structure safeguards the genome against DNA damage.
  • To explore whether chromatin domain formation hinders DNA repair machinery recruitment.
  • To elucidate the dynamic changes in chromatin during DNA repair processes.

Main Methods:

  • Utilizing single-nucleosome imaging and tracking to detect chromatin state changes in living cells.
  • Analyzing genomics data in conjunction with imaging techniques.
  • Observing chromatin decompaction and motion following DNA damage.

Main Results:

  • DNA compaction, including chromatin domain formation, plays a critical role in maintaining genome integrity against damage.
  • Cells can decompact chromatin domains post-DNA damage, enhancing DNA accessibility.
  • Increased chromatin motion facilitates efficient DNA repair at damaged sites.

Conclusions:

  • Chromatin compaction is a key mechanism for genome protection.
  • Dynamic chromatin remodeling, including decompaction, is essential for effective DNA repair.
  • Understanding chromatin's role in DNA damage response may have clinical implications for DNA damage resistance.