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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
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Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
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Chromatin potentiates transcription.

Shigeki Nagai1, Ralph E Davis1, Pierre Jean Mattei1

  • 1Department of Structural Biology, Stanford University School of Medicine, Stanford, CA 94305.

Proceedings of the National Academy of Sciences of the United States of America
|February 1, 2017
PubMed
Summary

Chromatin, not naked DNA, enhanced PHO5 gene transcription in yeast. Nucleosomes, previously seen as repressors, play a crucial positive role in gene activation and transcription start site accuracy.

Keywords:
PHO5RNA polymerase IISaccharomyces cerevisiae

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Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Gene Regulation

Background:

  • Chromatin structure, particularly nucleosomes, is traditionally viewed as a barrier to transcription.
  • The PHO5 gene in yeast is a well-studied model for gene regulation.
  • Understanding the precise role of chromatin in transcription initiation is crucial for deciphering gene expression.

Purpose of the Study:

  • To investigate the role of a nucleosome in the transcription of the PHO5 gene locus.
  • To compare transcription efficiency and accuracy between chromatin and naked DNA templates.
  • To identify the contribution of specific chromatin modifications to transcription.

Main Methods:

  • In vitro transcription assays using purified yeast proteins and isolated chromatin.
  • Reconstitution of the PHO5 gene locus into chromatin.
  • Analysis of transcription start site patterns and quantification of transcript levels.
  • Assessment of histone acetylation and H3K4me3 modifications.

Main Results:

  • Chromatin-templated transcription of the PHO5 gene was significantly enhanced (at least sevenfold) compared to naked DNA.
  • Chromatin produced transcription start site patterns similar to in vivo conditions, while naked DNA yielded aberrant transcripts.
  • Histone acetylation and H3K4me3 modifications were found to be important for efficient chromatin transcription.
  • A nucleosome occluding the TATA box and transcription start sites did not impede but rather facilitated transcription.

Conclusions:

  • Nucleosomes can play a positive role in transcription, enhancing gene expression and accuracy.
  • Histone modifications like acetylation and H3K4me3 are critical for facilitating transcription from chromatin.
  • The findings challenge the traditional view of nucleosomes solely as transcriptional repressors.