Homologous recombination is initiated by nucleolytic degradation (resection) of DNA double-strand breaks (DSBs). DSB resection is a two-step process in which an initial short-range step is catalyzed by the Mre11-Rad50-Xrs2 (MRX) complex and limited to the vicinity of the DSB end. Then the two long-range resection Exo1 and Dna2-Sgs1 nucleases extend the resected DNA tracts. How short-range resection is regulated and contributes to checkpoint activation remains to be determined. Here, we show that abrogation of long-range resection induces a checkpoint response that decreases DNA damage resistance. This checkpoint depends on the 9-1-1 complex, which recruits Dpb11 and Rad9 at damaged DNA. Furthermore, the 9-1-1 complex, independently of Dpb11 and Rad9, restricts short-range resection by negatively regulating Mre11 nuclease. We propose that 9-1-1, which is loaded at the leading edge of resection, plays a key function in regulating Mre11 nuclease and checkpoint activation once DSB resection is initiated.
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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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