The Saccharomyces cerevisiae DNA2 gene encodes a DNA-stimulated ATPase and DNA helicase/nuclease essential for DNA replication. In characterizing dna2 mutants, we have found that Dna2p also participates in DNA repair or in damage avoidance mechanisms. dna2 mutants are sensitive to X rays, although they are less sensitive than rad52 mutants. The X-ray sensitivity of dna2 mutants is suppressed by overexpression of a 5' to 3' exonuclease, the yeast FEN-1 structure-specific nuclease, encoded by the RAD27 gene, which also suppresses the growth defect of dna2-ts mutants. SGS1 encodes a helicase with similar properties to Dna2 protein. Although sgs1Delta mutants are resistant to X rays, dna2-2 sgs1Delta double mutants are more sensitive to X rays than the dna2-2 mutant. Temperature sensitive dna2 mutants are only slightly sensitive to UV light, show normal levels of spontaneous and UV induced mutagenesis, and have only a 2.5-fold elevated level of dinucleotide tract instability compared to wildtype. However, dna2Delta strains kept alive by overproduction of RAD27 are highly sensitive to UV light. These phenotypes, in addition to the epistasis analysis reported, allow us to propose that Dna2 is involved in postreplication and DSB repair pathways.
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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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