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Sequence and context effects on origin function in mammalian cells

P A Dijkwel1, J L Hamlin

  • 1Department of Biochemistry, University of Virginia School of Medicine, Charlottesville 22908, USA.

Journal of Cellular Biochemistry
|August 1, 1996
PubMed
Summary
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Identifying DNA replication origins in mammalian cells is challenging. Studies suggest initiation occurs across broad zones, with specific sites potentially acting as true genetic replicators, influenced by transcription and DNA stress.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The Jacob-Brenner model describes DNA replication control via initiator proteins and replicators.
  • Identifying mammalian chromosomal replicators is difficult due to a lack of genetic methods.
  • Focus has shifted to locating nascent strand start sites as indicators of replicator proximity.

Purpose of the Study:

  • To investigate the location and nature of DNA replication origins in mammalian chromosomes.
  • To analyze replication intermediates at the dihydrofolate reductase locus in CHO cells.
  • To understand factors influencing DNA replication origin activity.

Main Methods:

  • Analysis of replication intermediates using various techniques.
  • Application of multiple techniques to the dihydrofolate reductase locus in CHO cells.

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Main Results:

  • DNA replication initiation occurs at numerous sites within a broad zone at the dihydrofolate reductase locus.
  • Two specific sites show a higher frequency of initiation, suggesting they may be true genetic replicators.
  • Local transcriptional activity and torsional stress (nuclear matrix attachment) significantly impact origin activity.

Conclusions:

  • Mammalian DNA replication origins are not fixed points but distributed zones.
  • Specific initiation sites and regulatory factors like transcription and DNA topology are crucial for replication control.