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000860817 1001_ $$0P:(DE-HGF)0$$aLitschko, Christof$$b0$$eCorresponding author
000860817 245__ $$aFunctional integrity of the contractile actin cortex is safeguarded by multiple Diaphanous-related formins
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000860817 520__ $$aThe contractile actin cortex is a thin layer of filamentous actin, myosin motors, and regulatory proteins beneath the plasma membrane crucial to cytokinesis, morphogenesis, and cell migration. However, the factors regulating actin assembly in this compartment are not well understood. Using the Dictyostelium model system, we show that the three Diaphanous-related formins (DRFs) ForA, ForE, and ForH are regulated by the RhoA-like GTPase RacE and synergize in the assembly of filaments in the actin cortex. Single or double formin-null mutants displayed only moderate defects in cortex function whereas the concurrent elimination of all three formins or of RacE caused massive defects in cortical rigidity and architecture as assessed by aspiration assays and electron microscopy. Consistently, the triple formin and RacE mutants encompassed large peripheral patches devoid of cortical F-actin and exhibited severe defects in cytokinesis and multicellular development. Unexpectedly, many forA−/E−/H− and racE− mutants protruded efficiently, formed multiple exaggerated fronts, and migrated with morphologies reminiscent of rapidly moving fish keratocytes. In 2D-confinement, however, these mutants failed to properly polarize and recruit myosin II to the cell rear essential for migration. Cells arrested in these conditions displayed dramatically amplified flow of cortical actin filaments, as revealed by total internal reflection fluorescence (TIRF) imaging and iterative particle image velocimetry (PIV). Consistently, individual and combined, CRISPR/Cas9-mediated disruption of genes encoding mDia1 and -3 formins in B16-F1 mouse melanoma cells revealed enhanced frequency of cells displaying multiple fronts, again accompanied by defects in cell polarization and migration. These results suggest evolutionarily conserved functions for formin-mediated actin assembly in actin cortex mechanics.
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000860817 7001_ $$0P:(DE-Juel1)128805$$aCsiszár, Agnes$$b2
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000860817 7001_ $$0P:(DE-HGF)0$$aDimchev, Vanessa$$b4
000860817 7001_ $$0P:(DE-HGF)0$$aDamiano-Guercio, Julia$$b5
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000860817 7001_ $$0P:(DE-HGF)0$$aWinterhoff, Moritz$$b8
000860817 7001_ $$0P:(DE-HGF)0$$aNordholz, Benjamin$$b9
000860817 7001_ $$0P:(DE-HGF)0$$aRamalingam, Nagendran$$b10
000860817 7001_ $$00000-0002-3754-2028$$aPeckham, Michelle$$b11
000860817 7001_ $$0P:(DE-HGF)0$$aRottner, Klemens$$b12
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000860817 773__ $$0PERI:(DE-600)1461794-8$$a10.1073/pnas.1821638116$$gp. 201821638 -$$n9$$p3594-3603$$tProceedings of the National Academy of Sciences of the United States of America$$v116$$x1091-6490$$y2019
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