Trinucleotide repeats (TNRs) are sequences whose expansion causes several genetic diseases and chromosome breakage. We report a novel finding that expanded CAG repeats activate the DNA damage response. Mutations in yeast MEC1, RAD9, or RAD53 genes result in increased rates of fragility of a CAG repeat tract while single or double deletions of RAD17 or RAD24 have only a modest effect on TNR fragility, indicating that signaling down the Rad9 pathway and not the Rad17-Rad24 pathway plays a major role in sensing and repairing CAG-tract breaks. Deletion of CHK1 had no effect on CAG fragility, suggesting that a Chk1-mediated G2 arrest is not required for TNR repair. Absence of Mec1, Ddc2, Rad17, Rad24, or Rad53 also gives rise to increased frequency of CAG repeat contractions, indicating that components of the checkpoint machinery play an active role in the maintenance of both chromosomal integrity and repeat stability at expanded CAG sequences.
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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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