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- W2027111357 abstract "Animal cells disassemble and reassemble their nuclear envelopes (NEs) upon each division [1Burke B. Ellenberg J. Remodelling the walls of the nucleus.Nat. Rev. Mol. Cell Biol. 2002; 3: 487-497Crossref PubMed Scopus (187) Google Scholar, 2Güttinger S. Laurell E. Kutay U. Orchestrating nuclear envelope disassembly and reassembly during mitosis.Nat. Rev. Mol. Cell Biol. 2009; 10: 178-191Crossref PubMed Scopus (342) Google Scholar]. Nuclear envelope breakdown (NEBD) serves as a major regulatory mechanism by which mixing of cytoplasmic and nuclear compartments drives the complete reorganization of cellular architecture, committing the cell for division [2Güttinger S. Laurell E. Kutay U. Orchestrating nuclear envelope disassembly and reassembly during mitosis.Nat. Rev. Mol. Cell Biol. 2009; 10: 178-191Crossref PubMed Scopus (342) Google Scholar, 3Hetzer M.W. The nuclear envelope.Cold Spring Harb. Perspect. Biol. 2010; 2: a000539Crossref Scopus (211) Google Scholar]. Breakdown is initiated by phosphorylation-driven partial disassembly of the nuclear pore complexes (NPCs), increasing their permeability but leaving the overall NE structure intact [4Dultz E. Zanin E. Wurzenberger C. Braun M. Rabut G. Sironi L. Ellenberg J. Systematic kinetic analysis of mitotic dis- and reassembly of the nuclear pore in living cells.J. Cell Biol. 2008; 180: 857-865Crossref PubMed Scopus (189) Google Scholar, 5Laurell E. Beck K. Krupina K. Theerthagiri G. Bodenmiller B. Horvath P. Aebersold R. Antonin W. Kutay U. Phosphorylation of Nup98 by multiple kinases is crucial for NPC disassembly during mitotic entry.Cell. 2011; 144: 539-550Abstract Full Text Full Text PDF PubMed Scopus (186) Google Scholar, 6Lénárt P. Rabut G. Daigle N. Hand A.R. Terasaki M. Ellenberg J. Nuclear envelope breakdown in starfish oocytes proceeds by partial NPC disassembly followed by a rapidly spreading fenestration of nuclear membranes.J. Cell Biol. 2003; 160: 1055-1068Crossref PubMed Scopus (120) Google Scholar, 7Terasaki M. Campagnola P. Rolls M.M. Stein P.A. Ellenberg J. Hinkle B. Slepchenko B. A new model for nuclear envelope breakdown.Mol. Biol. Cell. 2001; 12: 503-510Crossref PubMed Scopus (74) Google Scholar]. Subsequently, the NE is rapidly broken into membrane fragments, defining the transition from prophase to prometaphase and resulting in complete mixing of cyto- and nucleoplasm [6Lénárt P. Rabut G. Daigle N. Hand A.R. Terasaki M. Ellenberg J. Nuclear envelope breakdown in starfish oocytes proceeds by partial NPC disassembly followed by a rapidly spreading fenestration of nuclear membranes.J. Cell Biol. 2003; 160: 1055-1068Crossref PubMed Scopus (120) Google Scholar, 8Beaudouin J. Gerlich D. Daigle N. Eils R. Ellenberg J. Nuclear envelope breakdown proceeds by microtubule-induced tearing of the lamina.Cell. 2002; 108: 83-96Abstract Full Text Full Text PDF PubMed Scopus (354) Google Scholar]. However, the mechanism underlying this rapid NE fragmentation remains largely unknown. Here, we show that NE fragmentation during NEBD in starfish oocytes is driven by an Arp2/3 complex-nucleated F-actin “shell” that transiently polymerizes on the inner surface of the NE. Blocking the formation of this F-actin shell prevents membrane fragmentation and delays entry of large cytoplasmic molecules into the nucleus. We observe spike-like protrusions extending from the F-actin shell that appear to “pierce” the NE during the fragmentation process. Finally, we show that NE fragmentation is essential for successful reproduction, because blocking this process in meiosis leads to formation of aneuploid eggs." @default.
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- W2027111357 date "2014-06-01" @default.
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- W2027111357 title "An Arp2/3 Nucleated F-Actin Shell Fragments Nuclear Membranes at Nuclear Envelope Breakdown in Starfish Oocytes" @default.
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- W2027111357 doi "https://doi.org/10.1016/j.cub.2014.05.019" @default.
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