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Requirement of the Spindle Checkpoint for Proper Chromosome Segregation in Budding Yeast Meiosis
Marion A. Shonn,1*
Robert McCarroll,2
Andrew W. Murray13*
The spindle checkpoint was characterized in meiosis of budding
yeast. In the absence of the checkpoint, the frequency of meiosisI
missegregation increased with increasing chromosome length,reaching 19% for the longest chromosome. Meiosis I nondisjunctionin
spindle checkpoint mutants could be prevented by delaying theonset of
anaphase. In a recombination-defective mutant (spo11),the checkpoint delays the biochemical events of anaphase I, suggestingthat chromosomes that are attached to microtubules but are notunder
tension can activate the spindle checkpoint. Spindle checkpointmutants
reduce the accuracy of chromosome segregation in meiosisI much more
than that in meiosis II, suggesting that checkpointdefects may
contribute to Down syndrome.
1 Department of Biochemistry and
3 Department of Physiology, University of California, San
Francisco, CA 94143-0444, USA.
2 Cereon Genomics, LLC, 45 Sidney Street, Cambridge, MA 02139, USA.
*
Present address: Department of Molecular and Cellular Biology,
Harvard University, Cambridge, MA 02138, USA.
To whom correspondence should be addressed. E-mail:
amurray{at}mcb.harvard.edu
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