Spindle Scaling Is Governed by Cell Boundary Regulation of Microtubule Nucleation.

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

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.

Details

OriginalspracheEnglisch
Seiten (von - bis)4973-4983
Seitenumfang11
FachzeitschriftCurrent biology : CB
Jahrgang30
Ausgabenummer24
PublikationsstatusVeröffentlicht - Nov. 2020
Peer-Review-StatusJa

Externe IDs

PubMed 33217321
Scopus 85097417308

Schlagworte

Bibliotheksschlagworte