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How to make a static cytokinetic furrow out of traveling excitable waves

Emergence of the cytokinetic Rho zone that orchestrates formation and ingression of the cleavage furrow had been explained previously via microtubule-dependent cortical concentration of Ect2, a guanine nucleotide exchange factor for Rho. The results of a recent publication now demonstrate that, en r...

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Autores principales: Goryachev, Andrew B., Leda, Marcin, Miller, Ann L., von Dassow, George, Bement, William M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Taylor & Francis 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4905281/
https://www.ncbi.nlm.nih.gov/pubmed/27070950
http://dx.doi.org/10.1080/21541248.2016.1168505
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author Goryachev, Andrew B.
Leda, Marcin
Miller, Ann L.
von Dassow, George
Bement, William M.
author_facet Goryachev, Andrew B.
Leda, Marcin
Miller, Ann L.
von Dassow, George
Bement, William M.
author_sort Goryachev, Andrew B.
collection PubMed
description Emergence of the cytokinetic Rho zone that orchestrates formation and ingression of the cleavage furrow had been explained previously via microtubule-dependent cortical concentration of Ect2, a guanine nucleotide exchange factor for Rho. The results of a recent publication now demonstrate that, en route from resting cortex to fully established furrow, there lies a regime of cortical excitability in which Rho activity and F-actin play the roles of the prototypical activator and inhibitor, respectively. This cortical excitability is manifest as dramatic traveling waves on the cortex of oocytes and embryos of frogs and starfish. These waves are initiated by autocatalytic activation of Rho at the wave front and extinguished by F-actin-dependent inhibition at their back. It is still unclear how propagating excitable Rho-actin waves give rise to the stable co-existence of Rho activity and F-actin density in the static cleavage furrow during cytokinesis. It is possible that some central spindle-associated signaling molecule simply turns off the inhibition of Rho activity by F-actin. However, mathematical modeling suggests a distinct scenario in which local “re-wiring” of the Rho-actin coupling in the furrow is no longer necessary. Instead, the model predicts that the continuously rising level of Ect2 produces in the furrow a qualitatively new stable steady state that replaces excitability and brings about the stable co-existence of high Rho activity and dense F-actin despite the continuing inhibition of Rho by F-actin.
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spelling pubmed-49052812016-06-29 How to make a static cytokinetic furrow out of traveling excitable waves Goryachev, Andrew B. Leda, Marcin Miller, Ann L. von Dassow, George Bement, William M. Small GTPases Commentary Emergence of the cytokinetic Rho zone that orchestrates formation and ingression of the cleavage furrow had been explained previously via microtubule-dependent cortical concentration of Ect2, a guanine nucleotide exchange factor for Rho. The results of a recent publication now demonstrate that, en route from resting cortex to fully established furrow, there lies a regime of cortical excitability in which Rho activity and F-actin play the roles of the prototypical activator and inhibitor, respectively. This cortical excitability is manifest as dramatic traveling waves on the cortex of oocytes and embryos of frogs and starfish. These waves are initiated by autocatalytic activation of Rho at the wave front and extinguished by F-actin-dependent inhibition at their back. It is still unclear how propagating excitable Rho-actin waves give rise to the stable co-existence of Rho activity and F-actin density in the static cleavage furrow during cytokinesis. It is possible that some central spindle-associated signaling molecule simply turns off the inhibition of Rho activity by F-actin. However, mathematical modeling suggests a distinct scenario in which local “re-wiring” of the Rho-actin coupling in the furrow is no longer necessary. Instead, the model predicts that the continuously rising level of Ect2 produces in the furrow a qualitatively new stable steady state that replaces excitability and brings about the stable co-existence of high Rho activity and dense F-actin despite the continuing inhibition of Rho by F-actin. Taylor & Francis 2016-04-12 /pmc/articles/PMC4905281/ /pubmed/27070950 http://dx.doi.org/10.1080/21541248.2016.1168505 Text en © 2016 The Author(s). Published by Taylor & Francis. http://creativecommons.org/licenses/by/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License( http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The moral rights of the named author(s) have been asserted.
spellingShingle Commentary
Goryachev, Andrew B.
Leda, Marcin
Miller, Ann L.
von Dassow, George
Bement, William M.
How to make a static cytokinetic furrow out of traveling excitable waves
title How to make a static cytokinetic furrow out of traveling excitable waves
title_full How to make a static cytokinetic furrow out of traveling excitable waves
title_fullStr How to make a static cytokinetic furrow out of traveling excitable waves
title_full_unstemmed How to make a static cytokinetic furrow out of traveling excitable waves
title_short How to make a static cytokinetic furrow out of traveling excitable waves
title_sort how to make a static cytokinetic furrow out of traveling excitable waves
topic Commentary
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4905281/
https://www.ncbi.nlm.nih.gov/pubmed/27070950
http://dx.doi.org/10.1080/21541248.2016.1168505
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