The mechanisms used by checkpoints to identify DNA lesions are poorly understood and may involve the function of repair proteins. Looking for mutants specifically defective in activating the checkpoint following UV lesions, but proficient in the response to methyl methane sulfonate and double-strand breaks, we isolated cdu1-1, which is allelic to RAD14, the homolog of human XPA, involved in lesion recognition during nucleotide excision repair (NER). Rad14 was also isolated as a partner of the Ddc1 checkpoint protein in a two-hybrid screening, and physical interaction was proven by co-immunoprecipitation. We show that lesion recognition is not sufficient for checkpoint activation, but processing, carried out by repair factors, is required for recruiting checkpoint proteins to damaged DNA. Mutations affecting the core NER machinery abolish G1 and G2 checkpoint responses to UV, preventing activation of the Mec1 kinase and its binding to chromosomes. Conversely, elimination of transcription-coupled or global genome repair alone does not affect checkpoints, suggesting a possible interpretation for the heterogeneity in cancer susceptibility observed in different NER syndrome patients.
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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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