Tension between two kinetochores suffices for their bi-orientation on the mitotic spindle

Hiiary Dewar, Kozo Tanaka, Kim Nasmyth, Tomoyuki U. Tanaka

Research output: Contribution to journalArticlepeer-review

152 Citations (Scopus)

Abstract

The movement of sister chromatids to opposite spindle poles during anaphase depends on the prior capture of sister kinetochores by microtubules with opposing orientations (amphitelic attachment or bi-orientation) 1. In addition to proteins necessary for the kinetochore-microtubule attachment, bi-orientation requires the Ipl1 (Aurora B in animal cells) protein kinase2-7 and tethering of sister chromatids by cohesin 8,9. Syntelic attachments, in which sister kinetochores attach to microtubules with the same orientation, must be either 'avoided' or 'corrected'. Avoidance might be facilitated by the juxtaposition of sister kinetochores such that they face in opposite directions; kinetochore geometry is therefore deemed important. Error correction, by contrast, is thought to stem from the stabilization of kinetochore-spindle pole connections by tension in microtubules, kinetochores, or the surrounding chromatin arising from amphitelic but not syntelic attachment10,11. The tension model predicts that any type of connection between two kinetochores suffices for efficient bi-orientation. Here we show that the two kinetochores of engineered, unreplicated dicentric chromosomes in Saccharomyces cerevisiae bi-orient efficiently, implying that sister kinetochore geometry is dispensable for bi-orientation. We also show that Ipl1 facilitates bi-orientation by promoting the turnover of kinetochore-spindle pole connections in a tension-dependent manner.

Original languageEnglish
Pages (from-to)93-97
Number of pages5
JournalNature
Volume428
Issue number6978
DOIs
Publication statusPublished - 2004 Mar 4
Externally publishedYes

ASJC Scopus subject areas

  • General

Fingerprint

Dive into the research topics of 'Tension between two kinetochores suffices for their bi-orientation on the mitotic spindle'. Together they form a unique fingerprint.

Cite this