PUBLICATION
Spindle Scaling Is Governed by Cell Boundary Regulation of Microtubule Nucleation
- Authors
- Rieckhoff, E.M., Berndt, F., Elsner, M., Golfier, S., Decker, F., Ishihara, K., Brugués, J.
- ID
- ZDB-PUB-201121-11
- Date
- 2020
- Source
- Current biology : CB 30(24): 4973-4983.e10 (Journal)
- Registered Authors
- Keywords
- Xenopus, hierarchical regulation, microtubule dynamics, microtubule nucleation, mitotic spindle, scaling, spindle size, surface-to-volume ratio, zebrafish
- MeSH Terms
-
- Animals
- Cell Membrane/metabolism*
- Embryo, Nonmammalian
- Embryonic Development/physiology
- Intravital Microscopy
- Microtubules/metabolism*
- Mitosis/physiology*
- Spindle Apparatus/metabolism*
- Xenopus laevis
- Zebrafish
- PubMed
- 33217321 Full text @ Curr. Biol.
Citation
Rieckhoff, E.M., Berndt, F., Elsner, M., Golfier, S., Decker, F., Ishihara, K., Brugués, J. (2020) Spindle Scaling Is Governed by Cell Boundary Regulation of Microtubule Nucleation. Current biology : CB. 30(24):4973-4983.e10.
Abstract
Cellular organelles such as the mitotic spindle adjust their size to the dimensions of the cell. It is widely understood that spindle scaling is governed by regulation of microtubule polymerization. Here, we use quantitative microscopy in living zebrafish embryos and Xenopus egg extracts in combination with theory to show that microtubule polymerization dynamics are insufficient to scale spindles and only contribute below a critical cell size. In contrast, microtubule nucleation governs spindle scaling for all cell sizes. We show that this hierarchical regulation arises from the partitioning of a nucleation inhibitor to the cell membrane. Our results reveal that cells differentially regulate microtubule number and length using distinct geometric cues to maintain a functional spindle architecture over a large range of cell sizes.
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Human Disease / Model
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