Jun 9, 2016

Centrosome centering and decentering by microtubule network rearrangement

BioRxiv : the Preprint Server for Biology
Gaëlle LetortManuel Théry

Abstract

The centrosome is positioned at the cell center by pushing and pulling forces transmitted by microtubules (MTs). Centrosome decentering is often considered to result from asymmetric, cortical pulling forces exerted in particular by molecular motors on MTs, and controlled by external cues affecting the cell cortex locally. Here we used numerical simulations to investigate the possibility that it could equally result from the redistribution of pushing forces due to a reorientation of MTs. We first showed that MT gliding along cell edges and pivoting around the centrosome regulate MT rearrangement and thereby direct the spatial distribution of pushing forces, while the number, dynamics and stiffness of MTs determine the magnitude of these forces. By modulating these parameters, we identified different regimes, involving both pushing and pulling forces, characterized either by robust centrosome centering, robust off-centering or 'reactive' positioning. In those latter conditions weak asymmetric cues can induce a misbalance of pushing and pulling forces resulting in an abrupt transition from a centered to an off-centered position. Altogether these results point at the central role played by the configuration of the MTs on the distri...Continue Reading

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Mentioned in this Paper

Health Center
Molecular Motor Activity
Biological Neural Networks
Positioning Attribute
Exertion
YARS2 gene
Spatial Distribution
Centrosome
Microtubules
Structure of Cortex of Kidney

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