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A new model for nuclear envelope breakdown.

M Terasaki1, P Campagnola, M M Rolls

  • 1Department of Physiology, University of Connecticut Health Center, Farmington, 06032, USA. terasaki@neuron.uchc.edu

Molecular Biology of the Cell
|February 17, 2001
PubMed
Summary
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Nuclear pore disassembly precedes nuclear envelope breakdown during starfish oocyte maturation. This suggests a new model where pore disassembly creates fenestrations in the nuclear envelope.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Nuclear envelope breakdown (NEB) is a critical event in meiosis.
  • The precise timing and mechanism of NEB, particularly the role of nuclear pores, remain incompletely understood.

Purpose of the Study:

  • To investigate the temporal relationship between nuclear pore disassembly and nuclear envelope breakdown during starfish oocyte maturation.
  • To elucidate the mechanism governing the permeability changes of the nuclear envelope during this process.

Main Methods:

  • Confocal microscopy was used to monitor the entry of fluorescent 70-kDa dextran into the nucleus.
  • Imaging of green fluorescent protein (GFP) chimeras provided insights into nuclear pore dynamics.
  • Three-dimensional computer simulations of diffusion were employed to model membrane permeability changes.

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Main Results:

  • Dextran entry occurred in two distinct phases: a slow initial increase followed by a rapid wave.
  • Quantitative analysis revealed that nuclear pore disassembly initiates several minutes prior to visible nuclear envelope breakdown.
  • Computer simulations best explained the second phase of dextran entry as a spreading disruption of the nuclear permeability barrier.

Conclusions:

  • Nuclear pore disassembly is an early event that precedes nuclear envelope breakdown.
  • A novel model is proposed where nuclear pore disassembly leads to fenestrations in the nuclear envelope, facilitating its eventual breakdown.