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Related Concept Videos

Duplication of Chromatin Structure02:05

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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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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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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
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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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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
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In Vitro Characterization of Histone Chaperones using Analytical, Pull-Down and Chaperoning Assays
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Structure and function of histone chaperones in replication-coupled chromatin assembly.

Chao-Pei Liu1, Rui-Ming Xu1

  • 1State Key Laboratory of Epigenetic Regulation and Intervention, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China; School of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China.

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Summary

Cell division requires reassembling nucleosomes after DNA replication. This review covers how histone chaperones facilitate this process using new or parental histones, ensuring genetic and epigenetic inheritance.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Cell Biology

Background:

  • Chromatin must be reestablished after DNA replication for cell division.
  • Nucleosomes, the building blocks of chromatin, are disrupted during DNA replication.
  • Replication-coupled (RC) nucleosome assembly uses distinct pathways for new vs. parental histones.

Purpose of the Study:

  • To review recent structural and biochemical findings on RC nucleosome assembly.
  • To highlight the critical roles of histone chaperones in nucleosome reassembly.
  • To discuss the coordination between histone chaperones and DNA replication machinery.

Main Methods:

  • Structural biology studies of RC nucleosome assembly.
  • Biochemical assays investigating histone chaperone functions.
  • Analysis of interactions between histone chaperones and replisome components.

Main Results:

  • Histone chaperones are key players in both de novo and recycling pathways of nucleosome assembly.
  • Specific interactions link histone chaperones to DNA replication machinery.
  • These interactions ensure efficient coupling of nucleosome assembly to DNA replication.

Conclusions:

  • Understanding RC nucleosome assembly is crucial for maintaining genetic and epigenetic information.
  • Histone chaperones are central to successful chromatin replication and inheritance.
  • Future research should further elucidate these chaperone-replisome interactions.