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Nature Cell Biology
Article . 2010 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
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A kinetochore-independent mechanism drives anaphase chromosome separation during acentrosomal meiosis

Authors: Julien, Dumont; Karen, Oegema; Arshad, Desai;

A kinetochore-independent mechanism drives anaphase chromosome separation during acentrosomal meiosis

Abstract

Although assembly of acentrosomal meiotic spindles has been extensively studied, little is known about the segregation of chromosomes on these spindles. Here, we show in Caenorhabditis elegans oocytes that the kinetochore protein, KNL-1, directs assembly of meiotic kinetochores that orient chromosomes. However, in contrast to mitosis, chromosome separation during meiotic anaphase is kinetochore-independent. Before anaphase, meiotic kinetochores and spindle poles disassemble along with the microtubules on the poleward side of chromosomes. During anaphase, microtubules then form between the separating chromosomes. Functional analysis implicated a set of proteins that localize to a ring-shaped domain between kinetochores during pre-anaphase spindle assembly and anaphase separation. These proteins are localized by the chromosomal passenger complex, which regulates the loss of meiotic chromosome cohesion. Thus, meiotic segregation in C. elegans is a two-stage process, where kinetochores orient chromosomes, but are then dispensable for their separation. We suggest that separation is controlled by a meiosis-specific chromosomal domain to coordinate cohesin removal and chromosome segregation.

Keywords

Microscopy, Confocal, Chromosomal Proteins, Non-Histone, Kinesins, Protein Serine-Threonine Kinases, Aneuploidy, Microtubules, Chromosomes, Histones, Meiosis, Microscopy, Fluorescence, Chromosome Segregation, Oocytes, Animals, Aurora Kinase B, Anaphase, Caenorhabditis elegans, Caenorhabditis elegans Proteins, Kinetochores, Microtubule-Associated Proteins, Metaphase

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
182
Top 1%
Top 10%
Top 1%
bronze