In Saccharomyces cerevisiae, mutations in APN1, APN2 and either RAD1 or RAD10 genes are synthetic lethal. In fact, apn1 apn2 rad1 triple mutants can form microcolonies of approximately 300 cells. Expression of Nfo, the bacterial homologue of Apn1, suppresses the lethality. Turning off the expression of Nfo induces G(2)/M cell cycle arrest in an apn1 apn2 rad1 triple mutant. The activation of this checkpoint is RAD9 dependent and allows residual DNA repair. The Mus81/Mms4 complex was identified as one of these back-up repair activities. Furthermore, inactivation of Ntg1, Ntg2 and Ogg1 DNA N-glycosylase/AP lyases in the apn1 apn2 rad1 background delayed lethality, allowing the formation of minicolonies of approximately 10(5) cells. These results demonstrate that, under physiological conditions, endogenous DNA damage causes death in cells deficient in Apn1, Apn2 and Rad1/Rad10 proteins. We propose a model in which endogenous DNA abasic sites are converted into 3'-blocked single-strand breaks (SSBs) by DNA N-glycosylases/AP lyases. Therefore, we suggest that the essential and overlapping function of Apn1, Apn2, Rad1/Rad10 and Mus81/Mms4 is to repair 3'-blocked SSBs using their 3'-phosphodiesterase activity or their 3'-flap endonuclease activity, respectively.
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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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