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Visualization of replication factories attached to nucleoskeleton

P Hozák1, A B Hassan, D A Jackson

  • 1Sir William Dunn School of Pathology, University of Oxford, England.

Cell
|April 23, 1993
PubMed
Summary
This summary is machine-generated.

DNA replication occurs in discrete sites, or "factories," attached to a cellular skeleton. Newly synthesized DNA initially appears in these factories before spreading into surrounding chromatin.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • DNA replication is essential for cell division.
  • The spatial organization of DNA replication sites is not fully understood.

Purpose of the Study:

  • To visualize and characterize the physical sites of DNA synthesis within the nucleus.
  • To investigate the dynamics of DNA replication at these sites.

Main Methods:

  • HeLa cells were encapsulated in agarose microbeads.
  • DNA synthesis sites were labeled with biotin-11-dUTP and immunolabeled.
  • Light and electron microscopy were used to examine nuclear structures.
  • Chromatin was partially removed to visualize underlying structures.

Main Results:

  • Approximately 150 focal sites of DNA synthesis were observed per nucleus.
  • These sites contained DNA polymerase alpha and proliferating cell nuclear antigen.
  • Electron microscopy revealed discrete ovoid bodies attached to a nucleoskeleton.
  • Biotin incorporation initially occurred within these ovoid bodies, then spread to chromatin.

Conclusions:

  • DNA replication occurs at fixed polymerization factories attached to a nuclear skeleton.
  • Replication proceeds as the DNA template moves through these stationary factories.