Nucleolytic processing by nucleases can be a relevant mechanism to allow repair/restart of stalled replication forks. However, nuclease action needs to be controlled to prevent overprocessing of damaged replication forks that can be detrimental to genome stability. The checkpoint protein RAD9/53BP1 is known to limit nucleolytic degradation (resection) of DNA double-strand breaks (DSBs) in both yeast and mammals. Here, we show that loss of the inhibition that RAD9 exerts on resection exacerbates the sensitivity to replication stress of Mec1/ATR-defective yeast cells by exposing stalled replication forks to Dna2-dependent degradation. This RAD9 protective function is independent of checkpoint activation and relies mainly on RAD9-Dpb11 interaction. We propose that RAD9/53BP1 supports cell viability by protecting stalled replication forks from extensive resection when the intra-S checkpoint is not fully functional.
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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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