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The Nucleosome02:33

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DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
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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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Nucleosome-Dependent Pathways That Control Mitotic Progression.

Hironori Funabiki1, Christopher Jenness1, Christian Zierhut1

  • 1Laboratory of Chromosome and Cell Biology, The Rockefeller University, New York, New York 10065.

Cold Spring Harbor Symposia on Quantitative Biology
|March 9, 2018
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Summary
This summary is machine-generated.

Researchers developed a new method to study histone roles in cell division without altering gene activity. This revealed how key protein complexes regulate microtubule and nuclear envelope assembly, and suppress DNA repair during mitosis.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Eukaryotic DNA is packaged into nucleosomes, with histones H3, H4, H2A, and H2B crucial for DNA structure.
  • Studying histone roles in mitosis is challenging due to their involvement in transcriptional regulation.

Purpose of the Study:

  • To investigate the roles of histones H3 and H4 in mitotic progression using a novel experimental system.
  • To analyze nucleosome-bound protein complex functions in microtubule and nuclear envelope assembly during mitosis.

Main Methods:

  • Depletion of endogenous histones H3 and H4 from frog egg extracts.
  • Complementation with recombinant nucleosome arrays to maintain physiological conditions.
  • Analysis of mitotic progression without global transcriptomic changes.

Main Results:

  • Microtubule and nuclear envelope assembly are regulated by nucleosome-bound complexes, including RCC1-Ran and the chromosomal passenger complex (CPC).
  • The CPC influences mitotic chromatin composition by dissociating nucleosome remodelers and DNA repair proteins.
  • CPC activity suggests a role in suppressing DNA processing on mitotic chromosomes under tension.

Conclusions:

  • A novel method allows studying histone functions in mitosis independently of transcriptional control.
  • Nucleosome-bound complexes play critical roles in regulating cell division dynamics.
  • The CPC's suppression of DNA processing activities may be vital for maintaining genome integrity during mitosis.