A narrow window of cortical tension guides asymmetric spindle positioning in the mouse oocyte

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A narrow window of cortical tension guides asymmetric spindle positioning in the mouse oocyte

Authors
Type
Published Article
Journal
Nature Communications
2041-1723
Publisher
Nature Publishing Group
Identifiers
DOI: 10.1038/ncomms7027
Source
CdV-UPMC
Keywords
  • Biophysics
  • Meiosis
  • Cell Division
  • Cortical Tension
Funders
  • Labex
  • Santé, Sciences Biologiques et Chimie du Vivant

Abstract

Cell mechanics control the outcome of cell division. In mitosis, external forces applied on a stiff cortex direct spindle orientation and morphogenesis. During oocyte meiosis on the contrary, spindle positioning depends on cortex softening. How changes in cortical organization induce cortex softening has not yet been addressed. Furthermore, the range of tension that allows spindle migration remains unknown. Here, using artificial manipulation of mouse oocyte cortex as well as theoretical modelling, we show that cortical tension has to be tightly regulated to allow off-center spindle positioning: a too low or too high cortical tension both lead to unsuccessful spindle migration. We demonstrate that the decrease in cortical tension required for spindle positioning is fine-tuned by a branched F-actin network that triggers the delocalization of myosin-II from the cortex, which sheds new light on the interplay between actin network architecture and cortex tension.

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