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5-Bromouracil disrupts nucleosome positioning by inducing A-form-like DNA conformation in yeast cells

Kensuke Miki1, Mitsuhiro Shimizu, Michihiko Fujii

  • 1International Graduate School of Arts and Sciences, Yokohama City University, Seto 22-2, Kanazawa-Ku, Yokohama, Kanagawa 236-0027, Japan.

Biochemical and Biophysical Research Communications
|February 9, 2008
PubMed

Insights

5-Bromodeoxyuridine (BrdU) disrupts nucleosome positioning by altering DNA structure. This finding reveals how BrdU affects chromatin and gene regulation, impacting cellular differentiation and senescence.

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Yeast Genetics

Background:

  • 5-Bromodeoxyuridine (BrdU) influences gene expression linked to cellular differentiation and senescence.
  • Previous research suggests chromatin structure plays a role in BrdU's effects.

Purpose of the Study:

  • To investigate the impact of 5-bromouracil on nucleosome positioning in vivo.
  • To understand the mechanism by which BrdU affects chromatin structure.

Main Methods:

  • Utilized a TALS plasmid system in yeast for precise nucleosome assembly.
  • Introduced AT-rich sequences near an alpha2 operator to assess nucleosome stability.
  • Analyzed DNA mobility on polyacrylamide gels after BrdU treatment.

Main Results:

  • Insertion of AT-rich sequences destabilized nucleosome positioning in a sequence- and length-dependent manner.
  • 5-bromouracil significantly disrupted nucleosome positioning, particularly at AT-rich regions.
  • DNA containing 5-bromouracil exhibited increased mobility on gels, indicating a more rigid conformation.

Conclusions:

  • 5-bromouracil disrupts nucleosome positioning by inducing an A-form-like DNA conformation.
  • This DNA structural change is the likely mechanism behind BrdU's modulation of gene expression and cellular processes.

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