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Related Concept Videos

Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
The Nucleosome Core Particle02:10

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Histone Modification02:32

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The Nucleosome Core Particle01:12

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Related Experiment Video

Updated: May 7, 2026

Enhanced Reduced Representation Bisulfite Sequencing for Assessment of DNA Methylation at Base Pair Resolution
13:47

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Published on: February 24, 2015

Relationship between nucleosome positioning and DNA methylation.

Ramakrishna K Chodavarapu1, Suhua Feng, Yana V Bernatavichute

  • 1Department of Molecular, Cell, and Developmental Biology, University of California Los Angeles, Los Angeles, California 90095, USA.

Nature
|June 1, 2010
PubMed
Summary

Genome-wide nucleosome positioning in Arabidopsis thaliana reveals that nucleosomes influence DNA methylation patterns. This conserved mechanism suggests DNA methyltransferases target nucleosome-bound DNA, impacting gene regulation.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genomics

Background:

  • Nucleosomes, composed of DNA and histone octamers, are fundamental units of DNA organization and regulation in the nucleus.
  • Understanding nucleosome positioning is crucial for deciphering genome accessibility and gene expression control.

Purpose of the Study:

  • To perform a genome-wide analysis of nucleosome positioning in Arabidopsis thaliana.
  • To investigate the relationship between nucleosome positioning and DNA methylation patterns.
  • To explore the conservation of these relationships in human DNA.

Main Methods:

  • Massively parallel sequencing of mononucleosomes from Arabidopsis thaliana.
  • Integration of nucleosome positioning data with single-base resolution DNA methylation profiles.
  • Comparative analysis with human nucleosomal DNA data.

Main Results:

  • Identified 10-base periodicities in DNA methylation within nucleosome-bound DNA.
  • Demonstrated that nucleosomal DNA is more methylated than flanking DNA.
  • Observed conserved trends in human nucleosomal DNA, indicating conserved mechanisms.
  • Found nucleosome enrichment on exons and at intron-exon boundaries, similar to animal studies.
  • Noted enrichment of RNA polymerase II and DNA methylation on exons, suggesting roles in gene regulation and exon definition.

Conclusions:

  • Nucleosome positioning significantly influences genome-wide DNA methylation patterns.
  • DNA methyltransferases show preferential targeting of nucleosome-bound DNA.
  • The interplay between nucleosomes and DNA methylation is conserved across species.
  • Nucleosome positioning and DNA methylation may play roles in regulating RNA polymerase II processivity and exon definition.