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Visualizing DNA replication sites in the cell nucleus.

R Berezney1

  • 1Department of Biological Sciences, State University of New York, Buffalo 14260.

Seminars in Cell Biology
|April 1, 1991
PubMed
Summary
This summary is machine-generated.

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DNA replication occurs in clusters attached to the nuclear matrix, forming visible granules. These replication sites (clustersomes) maintain distinct patterns throughout the S-phase cell cycle.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • DNA replication is a fundamental cellular process.
  • The nuclear matrix plays a role in organizing nuclear functions.
  • Previous models did not fully explain the macroscopic organization of replication.

Purpose of the Study:

  • To investigate the macroscopic organization of DNA replication.
  • To provide evidence for the nuclear matrix's role in clustering replication sites.
  • To visualize and characterize replication granules (clustersomes).

Main Methods:

  • Fluorescence microscopy of permeabilized cells.
  • Biotin-11-dUTP incorporation to label replicating DNA.
  • In situ nuclear matrix extraction.

Related Experiment Videos

  • 5-bromodeoxyuridine incorporation for in vivo labeling.
  • Confocal light microscopy and multidimensional image analysis.

    • Main Results:

    • Discrete replication granules (clustersomes) were visualized.
    • Granule size and number suggest they are sites of replicon cluster synthesis.
    • Distinct patterns of replication sites were observed during early and late S-phase.
    • These patterns were maintained after nuclear matrix extraction.
    • Similar results were obtained using in vivo labeling.

    Conclusions:

    • DNA replication is organized into clusters (clustersomes) attached to the nuclear matrix.
    • These clusters are visualized as discrete granules.
    • Replication patterns are cell cycle-dependent and linked to the nuclear matrix structure.