Astral microtubule cross-linking safeguards uniform nuclear distribution in the Drosophila syncytium.
| Autor: | Deshpande O; Instituto Gulbenkian de Ciência, Fundação Calouste Gulbenkian, Oeiras, Portugal., de-Carvalho J; Instituto Gulbenkian de Ciência, Fundação Calouste Gulbenkian, Oeiras, Portugal., Vieira DV; Instituto Gulbenkian de Ciência, Fundação Calouste Gulbenkian, Oeiras, Portugal., Telley IA; Instituto Gulbenkian de Ciência, Fundação Calouste Gulbenkian, Oeiras, Portugal. |
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| Jazyk: | angličtina |
| Zdroj: | The Journal of cell biology [J Cell Biol] 2022 Jan 03; Vol. 221 (1). Date of Electronic Publication: 2021 Nov 12. |
| DOI: | 10.1083/jcb.202007209 |
| Abstrakt: | The early insect embryo develops as a multinucleated cell distributing the genome uniformly to the cell cortex. Mechanistic insight for nuclear positioning beyond cytoskeletal requirements is missing. Contemporary hypotheses propose actomyosin-driven cytoplasmic movement transporting nuclei or repulsion of neighbor nuclei driven by microtubule motors. Here, we show that microtubule cross-linking by Feo and Klp3A is essential for nuclear distribution and internuclear distance maintenance in Drosophila. Germline knockdown causes irregular, less-dense nuclear delivery to the cell cortex and smaller distribution in ex vivo embryo explants. A minimal internuclear distance is maintained in explants from control embryos but not from Feo-inhibited embryos, following micromanipulation-assisted repositioning. A dimerization-deficient Feo abolishes nuclear separation in embryo explants, while the full-length protein rescues the genetic knockdown. We conclude that Feo and Klp3A cross-linking of antiparallel microtubule overlap generates a length-regulated mechanical link between neighboring microtubule asters. Enabled by a novel experimental approach, our study illuminates an essential process of embryonic multicellularity. (© 2021 Deshpande et al.) |
| Databáze: | MEDLINE |
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