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Related Experiment Videos

Nuclear reassembly excludes large macromolecules.

J A Swanson1, P L McNeil

  • 1Department of Anatomy and Cellular Biology, Harvard Medical School, Boston, MA 02115.

Science (New York, N.Y.)
|October 23, 1987
PubMed
Summary
This summary is machine-generated.

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The cell nucleus re-establishes its distinct compartment during cell division by excluding large molecules. This process ensures the separation of nuclear and cytoplasmic contents after mitosis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The nucleus and cytoplasm are distinct cellular compartments.
  • During mitosis, the nuclear envelope disassembles, leading to mixing of soluble macromolecules.
  • Re-establishing distinct nuclear and cytoplasmic compartments after mitosis is crucial for cell function.

Purpose of the Study:

  • To investigate the mechanism by which interphase nuclear and cytoplasmic identities are reestablished after cell division.
  • To determine if soluble macromolecules are excluded during the reformation of the nucleus.

Main Methods:

  • Fibroblast cells were loaded with fluorescent dextrans of various molecular weights.
  • These labeled cells were then induced to divide.
  • The distribution of fluorescent dextrans was observed during and after mitosis using microscopy.

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Main Results:

  • Large fluorescent dextrans (molecular weight 40,000 and above) were excluded from condensed mitotic chromosomes.
  • These large dextrans were also excluded from newly forming postmitotic interphase nuclei.
  • Smaller molecules were not explicitly mentioned as being excluded, implying size-dependent exclusion.

Conclusions:

  • Postmitotic nuclear reassembly involves the exclusion of soluble macromolecules, not just organelles.
  • This exclusion mechanism contributes to the reestablishment of the nucleus as a distinct compartment.
  • Macromolecule exclusion may occur via exclusion from chromatin during mitosis and/or prior to nuclear envelope completion.