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Related Experiment Videos

Nucleosomes: a solution to a crowded intracellular environment?

A Minsky1, R Ghirlando, Z Reich

  • 1Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot, 76100, Israel.

Journal of Theoretical Biology
|October 7, 1997
PubMed
Summary
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Eukaryotic DNA

Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • Eukaryotic emergence involved increased DNA and confinement.
  • Macromolecular crowding promotes DNA self-assembly and condensation.
  • DNA condensation occurs in vitro and in systems lacking nucleosomes.

Purpose of the Study:

  • To hypothesize the role of nucleosomes in preventing excessive DNA condensation during eukaryotic evolution.
  • To explore how nucleosomes regulate DNA conformational space.

Main Methods:

  • In vitro studies of DNA self-assembly.
  • Analysis of cellular systems with and without nucleosomes.

Main Results:

  • High DNA concentration and confinement favor condensed DNA aggregates.

Related Experiment Videos

  • Nucleosome-free systems exhibit significant DNA condensation.
  • Nucleosomes counteract condensation driven by excluded volume effects.

    • Conclusions:

    • Nucleosomes are essential for negating excessive DNA condensation in eukaryotes.
    • Nucleosomes maintain DNA conformational flexibility and enable reversible structural modulations.
    • This regulation is crucial for eukaryotic cellular function.