Expósito Serrano, MaríaSánchez Molina, AnaGallardo Palomo, PaolaSalas-Pino, SilviaDaga, Rafael2025-12-172025-12-172020-08-17Curr Biol. 2020 Aug 17;30(16):3212-3222.e210.1016/j.cub.2020.05.066https://hdl.handle.net/10433/25241Proyectos de investigación Ministerio de Economía y Competitividad BFU2015-70604-P Ministerio de Economía y Competitividad PGC2018-099849-B-I00 Junta de Andalucía/Consejería de Economía, Conocimiento, Empresas y Universidad/FEDER/UPO UPO-1264663An important question in cell biology is how cellular organelles partition during cell division. In organisms undergoing closed mitosis, the elongation of an intranuclear spindle drives nuclear division, generating two identically sized nuclei [1, 2]. However, how the site of nuclear division is determined and the underlying mechanism driving nuclear envelope (NE) fission remain largely unknown. Here, using the fission yeast, we show that the microtubule bundler Ase1/PRC1 at the spindle midzone is required for the local concentration of nuclear pore complexes (NPCs) in the region of the NE in contact with the central spindle. As the spindle elongates during anaphase B, components of these NPCs are sequentially eliminated, and this is accompanied by the local remodeling of the NE. These two events lead to the eventual removal of NPCs and nuclear division. In the absence of importin a, NPCs remain stable in this region and no event of NE remodeling is observed. Consequently, cells fail to undergo nuclear division. Thus, our results highlight a new role of the central spindle as a spatial cue that determines the site of nuclear division and point to NPC removal as the triggering event.application/pdfenAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/MitosisImportin αNuclear pore complexNuclear envelopeNuclear envelope divisionCentral spindleMidzone membrane domainER tubulesEndomembrane sortingjournal articleopen access