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Kinetochore motors drive congression of peripheral polar chromosomes by overcoming random arm-ejection forces.

Abstract：

:Accurate chromosome segregation during cell division in metazoans relies on proper chromosome congression at the equator. Chromosome congression is achieved after bi-orientation to both spindle poles shortly after nuclear envelope breakdown, or by the coordinated action of motor proteins that slide misaligned chromosomes along pre-existing spindle microtubules. These proteins include the minus-end-directed kinetochore motor dynein, and the plus-end-directed motors CENP-E at kinetochores and chromokinesins on chromosome arms. However, how these opposite and spatially distinct activities are coordinated to drive chromosome congression remains unknown. Here we used RNAi, chemical inhibition, kinetochore tracking and laser microsurgery to uncover the functional hierarchy between kinetochore and arm-associated motors, exclusively required for congression of peripheral polar chromosomes in human cells. We show that dynein poleward force counteracts chromokinesins to prevent stabilization of immature/incorrect end-on kinetochore-microtubule attachments and random ejection of polar chromosomes. At the poles, CENP-E becomes dominant over dynein and chromokinesins to bias chromosome ejection towards the equator. Thus, dynein and CENP-E at kinetochores drive congression of peripheral polar chromosomes by preventing arm-ejection forces mediated by chromokinesins from working in the wrong direction.

journal_name

Nat Cell Biol

journal_title

Nature cell biology

authors

Barisic M,Aguiar P,Geley S,Maiato H

doi

10.1038/ncb3060

subject

Has Abstract

pub_date

2014-12-01 00:00:00

pages

1249-56

issue

12

eissn

1465-7392

issn

1476-4679

pii

ncb3060

journal_volume

16

pub_type

杂志文章

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