The genes RAD1, RAD2, RAD3 and RAD4 encode enzymes in the pathway leading to excision repair of UV-induced DNA damage in Saccharomyces cerevisiae. Four mutant alleles of these loci (rad1-1, rad2-2, rad3-12, and rad4-3) were studied for their effect on spontaneous reversion rate to lysine and histidine independence, by means of the 1000-compartment fluctuation test of von Borstel, Cain and Steinberg. Of these four excision-defective alleles, only rad3-12 was found to substantially increase the spontaneous reversion rate of the nonsense-suppressible lys1-1 allele, both through locus reversion as well as by forward mutation at one of eight suppressor loci. Similarly, only rad3-12 conferred a considerable increase in the reversion frequency of the missense his1-7 mutant. As the RAD3 gene product is believed to mediate the first step in the excision-repair pathway, it is assumed that spontaneous lesions in the rad3 strain are channelled into a mutagenic repair pathway, thus accounting for the enhanced spontaneous mutation rate.
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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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