Dual mechanisms prevent premature chromosome segregation during meiosis.

Abstract:

:In meiosis I, homologous chromosomes pair and then attach to the spindle so that the homologs can be pulled apart at anaphase I. The segregation of homologs before pairing would be catastrophic. We describe two mechanisms that prevent this. First, in early meiosis, Ipl1, the budding yeast homolog of the mammalian Aurora B kinase, triggers shedding of a kinetochore protein, preventing microtubule attachment. Second, Ipl1 localizes to the spindle pole bodies (SPBs), where it blocks spindle assembly. These processes are reversed upon expression of Ndt80. Previous studies have shown that Ndt80 is expressed when homologs have successfully partnered, and this triggers a rise in the levels of cyclin-dependent kinase (CDK). We found that CDK phosphorylates Ipl1, delocalizing it from SPBs, triggering spindle assembly. At the same time, kinetochores reassemble. Thus, dual mechanisms controlled by Ipl1 and Ntd80 coordinate chromosome and spindle behaviors to prevent the attachment of unpartnered chromosomes to the meiotic spindle.

journal_name

Genes Dev

journal_title

Genes & development

authors

Kim S,Meyer R,Chuong H,Dawson DS

doi

10.1101/gad.227454.113

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

2139-46

issue

19

eissn

0890-9369

issn

1549-5477

pii

27/19/2139

journal_volume

27

pub_type

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