Cell division and the response to genotoxic stress are intimately connected in eukaryotes, for example, by checkpoint pathways that signal the presence of DNA damage or its ongoing repair to the cell cycle machinery, leading to reversible arrest or apoptosis. Recent studies reveal another connection: the cyclin-dependent kinases (CDKs) that govern both DNA synthesis (S) phase and mitosis directly coordinate DNA repair processes with progression through the cell cycle. In both mammalian cells and yeast, the two major modes of double strand break (DSB) repair--homologous recombination (HR) and non-homologous end joining (NHEJ)--are reciprocally regulated during the cell cycle. In yeast, the cell cycle kinase Cdk1 directly promotes DSB repair by HR during the G2 phase. In mammalian cells, loss of Cdk2, which is active throughout S and G2 phases, results in defective DNA damage repair and checkpoint signaling. Here we provide an overview of data that implicate CDKs in the regulation of DNA damage responses in yeast and metazoans. In yeast, CDK activity is required at multiple points in the HR pathway; the precise roles of CDKs in mammalian HR have yet to be determined. Finally, we consider how the two different, and in some cases opposing, roles of CDKs--as targets of negative regulation by checkpoint signaling and as positive effectors of repair pathway selection and function--could be balanced to produce a coordinated and effective response to DNA damage.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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