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PMID:22389397
| Citation |
Moutinho-Santos, T, Conde, C and Sunkel, CE (2012) POLO ensures chromosome bi-orientation by preventing and correcting erroneous chromosome-spindle attachments. J. Cell. Sci. 125:576-83 |
|---|---|
| Abstract |
Correct chromosome segregation during cell division requires bi-orientation at the mitotic spindle. Cells possess mechanisms to prevent and correct inappropriate chromosome attachment. Sister kinetochores assume a 'back-to-back' geometry on chromosomes that favors amphitelic orientation but the regulation of this process and molecular components are unknown. Abnormal chromosome-spindle interactions do occur but are corrected through the activity of Aurora B, which destabilizes erroneous attachments. Here, we address the role of Drosophila POLO in chromosome-spindle interactions and show that, unlike inhibition of its activity, depletion of the protein results in bipolar spindles with most chromosomes forming stable attachments with both sister kinetochores bound to microtubules from the same pole in a syntelic orientation. This is partly the result of impaired localization and activity of Aurora B but also of an altered centromere organization with abnormal distribution of centromeric proteins and shorter interkinetochore distances. Our results suggests that POLO is required to promote amphitelic attachment and chromosome bi-orientation by regulating both the activity of the correction mechanism and the architecture of the centromere. |
| Links |
PubMed Online version:10.1242/jcs.092445 |
| Keywords |
Animals; Cell Cycle Checkpoints; Cell Line; Chromosome Segregation/physiology; Drosophila Proteins/antagonists & inhibitors; Drosophila Proteins/genetics; Drosophila Proteins/metabolism; Drosophila melanogaster/genetics; Drosophila melanogaster/metabolism; Kinetochores/metabolism; Microscopy, Fluorescence; Mitotic Spindle Apparatus/metabolism; Protein-Serine-Threonine Kinases/antagonists & inhibitors; Protein-Serine-Threonine Kinases/genetics; Protein-Serine-Threonine Kinases/metabolism; RNA Interference |
| edit table |
Significance
Annotations
| Gene product | Qualifier | GO Term | Evidence Code | with/from | Aspect | Extension | Notes | Status |
|---|---|---|---|---|---|---|---|---|
| GO:0051315: attachment of spindle microtubules to kinetochore involved in mitotic sister chromatid segregation |
ECO:0000314: |
P |
Figure 1 shows that POLO depletion leads to chromosomes attaching to the mitotic spindle with syntelic orientation. |
complete | ||||
|
involved_in |
GO:0051315: attachment of mitotic spindle microtubules to kinetochore |
ECO:0000314: direct assay evidence used in manual assertion |
P |
Seeded From UniProt |
complete | |||
See also
References
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