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Related Experiment Videos

Nucleosome positioning by human Alu elements in chromatin

E W Englander1, B H Howard

  • 1Laboratory of Molecular Growth Regulation, NICHD, National Institutes of Health, Bethesda, Maryland 20892, USA.

The Journal of Biological Chemistry
|April 28, 1995
PubMed
Summary

Alu sequences in primate genomes influence how nucleosomes are positioned. This finding suggests these repetitive elements play a role in organizing chromatin structure and potentially gene expression.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • Alu sequences are abundant repetitive elements in primate genomes.
  • These elements are found near RNA polymerase II-transcribed genes.
  • Previous in vitro studies showed Alu sequences can position nucleosomes.

Purpose of the Study:

  • To investigate if Alu sequences influence chromatin structure in vivo.
  • To determine the role of Alu repeats in nucleosome organization within the genome.

Main Methods:

  • Assaying Alu family members using consensus sequence probes.
  • Utilizing native chromatin as a template for analysis.
  • Computational analysis of naturally occurring Alu sequences.

Main Results:

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  • Alu sequences confer rotational positioning on nucleosomes in vivo.
  • A specific nicking pattern by DNase I suggests Alu repeats influence neighboring regions' nucleosome formation.
  • Nucleosome positioning information is inherent to Alu sequences.

Conclusions:

  • Alu sequences actively shape chromatin structure in primate genomes.
  • The chromatin organizing capacity of Alu repeats may clarify their functional significance.
  • This research provides insights into the role of repetitive elements in genome organization and gene regulation.