In budding yeast, the Rad9 protein is an important player in the maintenance of genomic integrity and has a well-characterised role in DNA damage checkpoint activation. Recently, roles for different post-translational histone modifications in the DNA damage response, including H2A serine 129 phosphorylation and H3 lysine 79 methylation, have also been demonstrated. Here, we show that Rad9 recruitment to foci and bulk chromatin occurs specifically after ionising radiation treatment in G2 cells. This stable recruitment correlates with late stages of double strand break (DSB) repair and, surprisingly, it is the hypophosphorylated form of Rad9 that is retained on chromatin rather than the hyperphosphorylated, checkpoint-associated, form. Stable Rad9 accumulation in foci requires the Mec1 kinase and two independently regulated histone modifications, H2A phosphorylation and Dot1-dependent H3 methylation. In addition, Rad9 is selectively recruited to a subset of Rad52 repair foci. These results, together with the observation that rad9Delta cells are defective in repair of IR breaks in G2, strongly indicate a novel post checkpoint activation role for Rad9 in promoting efficient repair of DNA DSBs by homologous recombination.
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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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Evidence ID | Analyze ID | File | Description |
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