Publication Date:
2007-03-10
Description:
Cellular checkpoints prevent mitosis in the presence of stalled replication forks. Whether checkpoints also ensure the completion of DNA replication before mitosis is unknown. Here, we show that in yeast smc5-smc6 mutants, which are related to cohesin and condensin, replication is delayed, most significantly at natural replication-impeding loci like the ribosomal DNA gene cluster. In the absence of Smc5-Smc6, chromosome nondisjunction occurs as a consequence of mitotic entry with unfinished replication despite intact checkpoint responses. Eliminating processes that obstruct replication fork progression restores the temporal uncoupling between replication and segregation in smc5-smc6 mutants. We propose that the completion of replication is not under the surveillance of known checkpoints.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Torres-Rosell, Jordi -- De Piccoli, Giacomo -- Cordon-Preciado, Violeta -- Farmer, Sarah -- Jarmuz, Adam -- Machin, Felix -- Pasero, Philippe -- Lisby, Michael -- Haber, James E -- Aragon, Luis -- GM 20056/GM/NIGMS NIH HHS/ -- MC_U120074328/Medical Research Council/United Kingdom -- R01 GM061766/GM/NIGMS NIH HHS/ -- R01 GM061766-07/GM/NIGMS NIH HHS/ -- R01 GM061766-08/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2007 Mar 9;315(5817):1411-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cell Cycle Group, Medical Research Council (MRC) Clinical Sciences Centre, Faculty of Medicine, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17347440" target="_blank"〉PubMed〈/a〉
Keywords:
*Anaphase
;
Cell Cycle Proteins/genetics/metabolism
;
Checkpoint Kinase 2
;
Chromosome Segregation
;
Chromosomes, Fungal/*genetics/metabolism
;
DNA Breaks, Double-Stranded
;
DNA Damage
;
*DNA Replication
;
DNA, Fungal/genetics/metabolism
;
DNA, Ribosomal/*genetics/metabolism
;
Genes, Fungal
;
Genes, rRNA
;
Metaphase
;
*Mitosis
;
Models, Genetic
;
Mutation
;
Nondisjunction, Genetic
;
Protein-Serine-Threonine Kinases/metabolism
;
S Phase
;
Saccharomyces cerevisiae/*cytology/*genetics/metabolism
;
Saccharomyces cerevisiae Proteins/genetics/metabolism
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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