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Histone structure and function.

M M Smith1

  • 1Department of Microbiology, School of Medicine, University of Virginia, Charlottesville 22908.

Current Opinion in Cell Biology
|June 1, 1991
PubMed
Summary
This summary is machine-generated.

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Histones alter DNA structure and function within nucleosomes. Recent studies reveal how histone modifications, like acetylation, impact DNA topology, gene repression, and chromosome dynamics, advancing our understanding of chromatin.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Histones and nucleosomes are fundamental to DNA packaging and regulation.
  • Understanding their structure and function is key to deciphering gene expression and chromosome dynamics.

Purpose of the Study:

  • To summarize recent major advances in understanding histone and nucleosome structure and function.
  • To highlight the impact of histone modifications on DNA topology and chromatin higher-order folding.

Main Methods:

  • Direct DNA mapping techniques.
  • Thermodynamic experiments.
  • Genetic experiments.

Main Results:

  • Conclusive evidence shows histones alter DNA helical pitch when wrapped around the histone octamer.

Related Experiment Videos

  • Lysine acetylation of histone H3 and H4 N-terminal domains affects DNA topology and chromatin folding.
  • Genetic studies identified a critical H4 peptide domain for gene repression and confirmed nucleosome importance for centromere function.

    • Conclusions:

    • Histone structure and modifications, particularly acetylation, significantly influence DNA topology, gene regulation, and chromosome dynamics.
    • Recent findings provide critical insights into the functional roles of nucleosomes in centromere function and permanent gene repression.