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Related Experiment Videos

Chromatin structure and gene expression

G Felsenfeld1, J Boyes, J Chung

  • 1National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0540, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 3, 1996
PubMed
Summary
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Chromatin structure changes near active genes. This study reveals how DNA elements can act as insulators and how polymerases navigate nucleosomes, impacting gene regulation and chromatin boundaries.

Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Chromatin structure is altered near expressed genes, particularly at promoters and enhancers, marked by nuclease hypersensitivity.
  • Transcription factor binding is linked to the formation of these accessible chromatin regions.
  • Understanding chromatin domain boundaries and nucleosome dynamics during transcription is crucial for gene regulation.

Purpose of the Study:

  • To investigate the relationship between transcription factor binding and the generation of nuclease hypersensitive regions.
  • To identify and characterize DNA elements that establish boundaries between active and inactive chromatin domains.
  • To examine the ability of RNA polymerase to transcribe through nucleosomes.

Main Methods:

  • Mutagenesis of cis-acting regulatory elements within a specific enhancer region.

Related Experiment Videos

  • Stable transformation of avian erythroid cell lines with modified DNA constructs.
  • Nuclease accessibility assays and functional characterization of DNA elements.

    • Main Results:

    • Weakening enhancer elements resulted in an all-or-none accessibility pattern, suggesting a mechanism for sharp regulatory responses.
    • A DNA element with insulator properties was identified, capable of blocking enhancer-promoter interactions.
    • Prokaryotic RNA polymerase demonstrated the ability to transcribe through a histone octamer, with the octamer repositioning without detaching from DNA.

    Conclusions:

    • Chromatin structure plays a role in sharpening developmental responses to regulatory factor concentrations.
    • Insulator elements are key in defining boundaries between active and inactive chromatin domains.
    • Nucleosomes do not necessarily impede transcription, as polymerases can navigate them through dynamic repositioning.