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Movement of membrane domains and requirement of membrane signaling molecules for cytokinesis
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This study shows formation of an equatorial membrane domainproxiaml to the contractile ring and enriched in ganglioside GM1 and cholesterol, occurs prior to furrow formation and remains as a distinct band in the cleavage furrow until late cytokinesis. Src and PLCγ are important components of this domain; these proteins are specifically phosphorylated at cytokinesis, and their activity is required for cleavage furrow progression.
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Ng M.M., Chang F., and Burgess D.R. Movement of membrane domains and requirement of membrane signaling molecules for cytokinesis. Dev Cell 9 (2005) 781-790. This study shows formation of an equatorial membrane domainproxiaml to the contractile ring and enriched in ganglioside GM1 and cholesterol, occurs prior to furrow formation and remains as a distinct band in the cleavage furrow until late cytokinesis. Src and PLCγ are important components of this domain; these proteins are specifically phosphorylated at cytokinesis, and their activity is required for cleavage furrow progression.
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Piel M., Nordberg J., Euteneuer U., and Bornens M. Centrosome-dependent exit of cytokinesis in animal cells. Science 291 (2001) 1550-1553
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Centriolin anchoring of exocyst and SNARE complexes at the midbody is required for secretory-vesicle-mediated abscission
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The authors demonstrate that centriolin interacts with snapin (sec15), sec3 and sec8, proteins associated with vesicle-targeting exocyst complexes and vesicle-fusion SNARE complexes. Vesicles move to the midbody ring asymmetrically from one prospective daughter cell, promoting membrane fusion and abscission. Centriolin is required for midbody localization of the exocyst; disruption of exocyst of SNARE complexes inhibits abscission.
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Gromley A., Yeaman C., Rosa J., Redick S., Chen C.T., Mirabelle S., Guha M., Sillibourne J., and Doxsey S.J. Centriolin anchoring of exocyst and SNARE complexes at the midbody is required for secretory-vesicle-mediated abscission. Cell 123 (2005) 75-87. The authors demonstrate that centriolin interacts with snapin (sec15), sec3 and sec8, proteins associated with vesicle-targeting exocyst complexes and vesicle-fusion SNARE complexes. Vesicles move to the midbody ring asymmetrically from one prospective daughter cell, promoting membrane fusion and abscission. Centriolin is required for midbody localization of the exocyst; disruption of exocyst of SNARE complexes inhibits abscission.
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Gromley, A.1
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Yamashita Y.M., Jones D.L., and Fuller M.T. Orientation of asymmetric stem cell division by the APC tumor suppressor and centrosome. Science 301 (2003) 1547-1550
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The extracellular matrix guides the orientation of the cell division axis
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Using a micro-contact printing technique to control the spatial distribution of an ECM substrate, the authors investigate the role of the ECM in determining the orientation of the division axis of HeLa cells. In round mitotic cells, the cortex is not homogeneous and contains cortical cues that modulate spindle orientation. These cues are associated with retraction fibers, and originate from the cortical heterogeneity of the pre-mitotic cell. The localization of and requirement for intracellular actin regulatory proteins were investigated, with cortactin and ezrin being implicated in this signaling.
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Thery M., Racine V., Pepin A., Piel M., Chen Y., Sibarita J.B., and Bornens M. The extracellular matrix guides the orientation of the cell division axis. Nat Cell Biol 7 (2005) 947-953. Using a micro-contact printing technique to control the spatial distribution of an ECM substrate, the authors investigate the role of the ECM in determining the orientation of the division axis of HeLa cells. In round mitotic cells, the cortex is not homogeneous and contains cortical cues that modulate spindle orientation. These cues are associated with retraction fibers, and originate from the cortical heterogeneity of the pre-mitotic cell. The localization of and requirement for intracellular actin regulatory proteins were investigated, with cortactin and ezrin being implicated in this signaling.
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Thery, M.1
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Bornens, M.7
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50
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24644494270
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Asymmetric cell divisions promote stratification and differentiation of mammalian skin
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Polarization cues program basal epidermal cells to divide asymmetrically, generating a committed suprabasal cell and a proliferative basal cell. This work demonstrates that both integrins and cadherins are essential for the apical localization of atypical protein kinase C, the Par3-LGN-Inscuteable complex and NuMA-dynactin. Together, these complexes align the spindle, contributing to the stratification of squamous epithelium.
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Lechler T., and Fuchs E. Asymmetric cell divisions promote stratification and differentiation of mammalian skin. Nature 437 (2005) 275-280. Polarization cues program basal epidermal cells to divide asymmetrically, generating a committed suprabasal cell and a proliferative basal cell. This work demonstrates that both integrins and cadherins are essential for the apical localization of atypical protein kinase C, the Par3-LGN-Inscuteable complex and NuMA-dynactin. Together, these complexes align the spindle, contributing to the stratification of squamous epithelium.
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Nature
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Munro E.M. PAR proteins and the cytoskeleton: a marriage of equals. Curr Opin Cell Biol 18 (2006) 86-94
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Planar cell polarity signalling couples cell division and morphogenesis during neurulation
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This study is one of the first to demonstrate the role of PCP signaling in vertebrate development. Genetic analysis of the interactions of Wnt, Van Gogh-like 2 (Vangl2/Strabismustrilobite) and Prickle shows the Wnt/PCP pathway polarizes neural progenitors along the anteroposterior axis. While this polarity is transiently lost during cell division, anchoring of dividing cells through these signals allows re-intercalation of daughter cells into the neuroepithelium. Defects in this pathway result in accumulation of ectopic neural progenitor cells and neural tube defects.
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Ciruna B., Jenny A., Lee D., Mlodzik M., and Schier A.F. Planar cell polarity signalling couples cell division and morphogenesis during neurulation. Nature 439 (2006) 220-224. This study is one of the first to demonstrate the role of PCP signaling in vertebrate development. Genetic analysis of the interactions of Wnt, Van Gogh-like 2 (Vangl2/Strabismustrilobite) and Prickle shows the Wnt/PCP pathway polarizes neural progenitors along the anteroposterior axis. While this polarity is transiently lost during cell division, anchoring of dividing cells through these signals allows re-intercalation of daughter cells into the neuroepithelium. Defects in this pathway result in accumulation of ectopic neural progenitor cells and neural tube defects.
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Nature
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Ciruna, B.1
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53
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This study demonstrates that lengthening of renal tubules is associated with mitotic orientation of cells along the tubule axis, requiring intrinsic planar cell polarization. The authors also find that mitotic orientations are significantly distorted in rodent polycystic kidney models, providing insights into the etiology of this disease. In this study, the non-motile renal cell cilia are suggested to act as mechanosensors for directional flow of fluids, organizing the PCP response.
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Fischer E., Legue E., Doyen A., Nato F., Nicolas J.F., Torres V., Yaniv M., and Pontoglio M. Defective planar cell polarity in polycystic kidney disease. Nat Genet 38 (2006) 21-23. This study demonstrates that lengthening of renal tubules is associated with mitotic orientation of cells along the tubule axis, requiring intrinsic planar cell polarization. The authors also find that mitotic orientations are significantly distorted in rodent polycystic kidney models, providing insights into the etiology of this disease. In this study, the non-motile renal cell cilia are suggested to act as mechanosensors for directional flow of fluids, organizing the PCP response.
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Nat Genet
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Fischer, E.1
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Yaniv, M.7
Pontoglio, M.8
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54
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Differentiating germ cells can revert into functional stem cells in Drosophila melanogaster ovaries
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Drosophila germline cystocytes generated either in second instar larval ovaries or in adults over-producing the BMP4-like stem cell signal Decapentaplegic efficiently convert into single stem-like cells. These de-differentiated cells can develop into functional germline stem cells and support normal fertility. As part of this study, the authors demonstrate that polarized Dpp cues emanating from a germline stem cell can regulate the timing of ring canal closure, a cytokinetic process previously shown to be under the control of Src.
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Kai T., and Spradling A. Differentiating germ cells can revert into functional stem cells in Drosophila melanogaster ovaries. Nature 428 (2004) 564-569. Drosophila germline cystocytes generated either in second instar larval ovaries or in adults over-producing the BMP4-like stem cell signal Decapentaplegic efficiently convert into single stem-like cells. These de-differentiated cells can develop into functional germline stem cells and support normal fertility. As part of this study, the authors demonstrate that polarized Dpp cues emanating from a germline stem cell can regulate the timing of ring canal closure, a cytokinetic process previously shown to be under the control of Src.
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Nature
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Hahn, W.C.8
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