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Chromosome segregation: dual control ensures fidelity
1School of Biological Sciences, University of Manchester, 2.205 Stopford Building, Oxford Road, Manchester, M13 9PT, UK. stephen.taylor@man.ac.uk
Current Biology : CB
|September 2, 1999
Summary
The mitotic checkpoint prevents cell division errors after spindle damage. This critical cell cycle control has two distinct functions: blocking anaphase and inhibiting cytokinesis and DNA re-replication.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- The mitotic checkpoint is crucial for preventing aneuploidy.
- Spindle damage triggers cell cycle arrest to ensure accurate chromosome segregation.
Purpose of the Study:
- To elucidate the distinct functional arms of the mitotic checkpoint.
- To investigate the mechanisms by which the checkpoint prevents anaphase and subsequent cell division events.
Main Methods:
- Cell cycle analysis
- Microscopy
- Biochemical assays
Main Results:
- The mitotic checkpoint comprises two independent pathways.
- One pathway inhibits anaphase onset.
- A second pathway prevents cytokinesis and DNA re-replication following mitotic arrest.
Conclusions:
- The mitotic checkpoint is a multi-faceted process.
- These two arms ensure genomic stability by preventing both premature chromosome separation and aberrant cell division.