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Related Experiment Videos

Cytoplasmic control of nuclear assembly.

P Collas1

  • 1University of Oslo, Institute of Medical Biochemistry, Blindern, Norway. philippe.collas@basalmed.uio.no

Reproduction, Fertility, and Development
|December 28, 1999
PubMed
Summary

The sea urchin egg cytoplasm drives male pronucleus formation through specific molecular events. This process involves nuclear lamina disassembly, histone exchange, and membrane vesicle fusion, mirroring nuclear reconstitution in other contexts.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Nuclear reconstitution is crucial for cell division, fertilization, and nuclear transplantation.
  • The cytoplasmic environment plays a key regulatory role in these nuclear assembly processes.

Purpose of the Study:

  • To investigate the cytoplasmic factors and molecular mechanisms governing male pronucleus formation during fertilization.
  • To understand how altering the cytoplasmic environment affects nuclear assembly.

Main Methods:

  • Utilized permeabilized sea urchin sperm nuclei incubated in a cell-free extract of fertilized sea urchin eggs.
  • Analyzed key molecular events including protein phosphorylation, histone exchange, and membrane vesicle dynamics.

Main Results:

  • Identified lamin phosphorylation by protein kinase C initiating pronuclear formation.
  • Demonstrated ATP- and pH-dependent chromatin decondensation and histone replacement.
  • Characterized the role of three distinct vesicle populations in ATP- and GTP-dependent nuclear envelope assembly.
  • Highlighted the involvement of a lamin B receptor-like protein in vesicle targeting to chromatin.

Conclusions:

  • Male pronucleus formation is a complex, stepwise process regulated by the egg cytoplasm.
  • These mechanisms are conserved across different nuclear reconstitution events, including post-mitosis and nuclear transplantation.
  • The study provides insights into the fundamental principles of nuclear assembly and remodeling.

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