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Related Experiment Videos

Origin usage during euplotes ribosomal DNA amplification.

Ming Tan1, Carolyn L Jahn, Carolyn M Price

  • 1Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati Medical Center, Cincinnati, Ohio 45267, USA.

Eukaryotic Cell
|February 13, 2003
PubMed
Summary
This summary is machine-generated.

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Euplotes ribosomal DNA (rDNA) replication initiates near telomeres, specifically at the 5' end. This telomere-promoter interaction suggests a coordinated mechanism for DNA replication initiation during macronuclear development.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The macronuclear genome of Euplotes consists of numerous small, linear DNA molecules capped by telomeres.
  • These molecules arise during sexual reproduction through DNA processing and amplification, forming a new macronucleus.

Purpose of the Study:

  • To investigate the location of DNA replication origins during vegetative growth and macronuclear development in Euplotes.
  • To compare replication origins during normal growth versus periods of differential DNA amplification.

Main Methods:

  • Utilized two-dimensional gel electrophoresis to analyze DNA replication intermediates.
  • Examined ribosomal DNA (rDNA) replication patterns and replication fork movement.

Main Results:

Related Experiment Videos

  • Observed consistent Y-shaped replication intermediates for rDNA, indicating initiation near telomeres.
  • Replication initiation predominantly occurred at the 5' end of the rDNA, not bidirectionally.
  • No bubble or bubble-to-Y replication intermediates were detected, suggesting specific origin usage.

Conclusions:

  • Macronuclear rDNA replication in Euplotes initiates at or near the telomere, even during amplification.
  • Replication initiation is directed from the 5' end, coinciding with the transcription start site.
  • Telomeres and promoter regions likely collaborate to recruit replication initiation complexes in Euplotes.