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Spindle-to-cortex communication in cleaving, polyspermic Xenopus eggs.

Christine M Field1, Aaron C Groen2, Phuong A Nguyen2

  • 1Department of Systems Biology, Harvard Medical School, Boston, MA 02115; Marine Biological Laboratory, Woods Hole, MA 02143 Christine_Field@hms.harvard.edu.

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Chromatin proximity guides cell division plane formation. Sister asters, near chromatin, recruit key proteins (CPC, Centralspindlin) to initiate furrowing, unlike nonsister asters.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Embryogenesis

Background:

  • Mitotic spindles orient cell division planes via microtubule asters.
  • The role of chromatin in specifying cleavage planes is not fully understood.

Purpose of the Study:

  • To investigate why only sister aster pairs induce furrows in frog embryos.
  • To elucidate the molecular mechanisms of cleavage plane specification.

Main Methods:

  • Utilized polyspermic fertilization as a natural experiment comparing sister and nonsister asters.
  • Analyzed recruitment of chromosome passenger complex (CPC) and Centralspindlin to microtubule bundles.
  • Employed intact eggs and a cytokinesis extract system to study CPC recruitment factors.

Main Results:

  • Only sister asters, with chromatin between them, recruited CPC and Centralspindlin.
  • Microtubule stabilization, aster distance, and chromatin proximity favored CPC recruitment.
  • A model was proposed where chromatin biases initial CPC recruitment.

Conclusions:

  • Chromatin proximity is critical for initiating furrow formation by sister asters.
  • A positive feedback loop between CPC recruitment and microtubule stabilization positions the cleavage furrow.