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Related Experiment Videos

Nucleosome positions predicted through comparative genomics.

Ilya P Ioshikhes1, Istvan Albert, Sara J Zanton

  • 1Department of Biomedical Informatics, The Ohio State University, Columbus, Ohio 43210, USA.

Nature Genetics
|September 12, 2006
PubMed
Summary
This summary is machine-generated.

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DNA sequence strongly influences nucleosome positioning, impacting gene regulation. This study maps these sequences genome-wide in yeast, revealing patterns linked to gene expression and chromatin remodeling.

Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • DNA sequence is known to influence nucleosome positioning.
  • Nucleosome positioning at gene promoters can regulate gene accessibility.
  • The precise role of DNA sequence in defining promoter nucleosomal architecture is under investigation.

Purpose of the Study:

  • To create a genome-wide map of nucleosome positioning sequences (NPSs) near all Saccharomyces cerevisiae genes.
  • To determine the predictive power of DNA sequence for nucleosome locations.
  • To identify characteristic NPS arrangements associated with different gene classes and their regulation.

Main Methods:

  • Comparative genomics was employed to identify NPSs across the yeast genome.
  • Analysis focused on NPS distribution in the vicinity of all Saccharomyces cerevisiae genes.

Related Experiment Videos

  • Correlations between NPS arrangements and gene regulatory features were examined.

    • Main Results:

    • The underlying DNA sequence is a strong predictor of nucleosome positioning.
    • A genome-wide map of NPSs was generated for Saccharomyces cerevisiae.
    • Distinct gene classes exhibit characteristic NPS arrangements, particularly in promoter regions.
    • Compact NPS arrangements in promoters correlate with TATA box inclusion and high regulation by chromatin modifiers.

    Conclusions:

    • DNA sequence plays a critical role in dictating nucleosome positioning at a genome-wide scale.
    • Specific NPS patterns in promoter regions are linked to gene regulatory mechanisms.
    • These findings provide insights into sequence-based control of gene accessibility and expression through nucleosome organization.