Castanon, Irinka; Abrami, Laurence; Holtzer, Laurent; Heisenberg, Carl-Philipp IST Austria ; Van Der Goot, Françoise; González Gaitán, Marcos
Oriented mitosis is essential during tissue morphogenesis. The Wnt/planar cell polarity (Wnt/PCP) pathway orients mitosis in a number of developmental systems, including dorsal epiblast cell divisions along the animal-vegetal (A-V) axis during zebrafish gastrulation. How Wnt signalling orients the mitotic plane is, however, unknown. Here we show that, in dorsal epiblast cells, anthrax toxin receptor 2a (Antxr2a) accumulates in a polarized cortical cap, which is aligned with the embryonic A-V axis and forecasts the division plane. Filamentous actin (F-actin) also forms an A-V polarized cap, which depends on Wnt/PCP and its effectors RhoA and Rock2. Antxr2a is recruited to the cap by interacting with actin. Antxr2a also interacts with RhoA and together they activate the diaphanous-related formin zDia2. Mechanistically, Antxr2a functions as a Wnt-dependent polarized determinant, which, through the action of RhoA and zDia2, exerts torque on the spindle to align it with the A-V axis.
Nature Cell Biology
This work was supported by the SNSF, the Swiss SystemsX.ch initiative and LipidX-2008/011 (M.G-G. and F.G.v.d.G.), by the Fondation SANTE-Vaduz/Aide au Soutien des Nouvelles Thérapies (F.G.v.d.G.) and by the ERC, the NCCR Frontiers in Genetics and Chemical Biology programmes and the Polish–Swiss research program (M.G-G.).
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Castanon I, Abrami L, Holtzer L, Heisenberg C-PJ, Van Der Goot F, González Gaitán M. Anthrax toxin receptor 2a controls mitotic spindle positioning. Nature Cell Biology. 2013;15(1):28-39. doi:10.1038/ncb2632
Castanon, I., Abrami, L., Holtzer, L., Heisenberg, C.-P. J., Van Der Goot, F., & González Gaitán, M. (2013). Anthrax toxin receptor 2a controls mitotic spindle positioning. Nature Cell Biology. Nature Publishing Group. https://doi.org/10.1038/ncb2632
Castanon, Irinka, Laurence Abrami, Laurent Holtzer, Carl-Philipp J Heisenberg, Françoise Van Der Goot, and Marcos González Gaitán. “Anthrax Toxin Receptor 2a Controls Mitotic Spindle Positioning.” Nature Cell Biology. Nature Publishing Group, 2013. https://doi.org/10.1038/ncb2632.
I. Castanon, L. Abrami, L. Holtzer, C.-P. J. Heisenberg, F. Van Der Goot, and M. González Gaitán, “Anthrax toxin receptor 2a controls mitotic spindle positioning,” Nature Cell Biology, vol. 15, no. 1. Nature Publishing Group, pp. 28–39, 2013.
Castanon I, Abrami L, Holtzer L, Heisenberg C-PJ, Van Der Goot F, González Gaitán M. 2013. Anthrax toxin receptor 2a controls mitotic spindle positioning. Nature Cell Biology. 15(1), 28–39.
Castanon, Irinka, et al. “Anthrax Toxin Receptor 2a Controls Mitotic Spindle Positioning.” Nature Cell Biology, vol. 15, no. 1, Nature Publishing Group, 2013, pp. 28–39, doi:10.1038/ncb2632.