A coliphage M13 chimer containing the Saccharomyces cerevisiae TRP1 gene and ARS1 replication origin (mPY2) was grown on an ung- dut- strain of Escherichia coli. The resulting single-stranded phage DNA had 13% of thymine residues substituted by uracil. This DNA failed to transform a delta trp1 yeast strain to prototrophy. However, when a mutagenized yeast stock was transformed with uracil-containing single-stranded mPY2 DNA, unstable transformants were obtained. After plasmid segregation, about half of these were retransformed at a high frequency by uracil-containing single-stranded mPY2 DNA. In vitro, these mutants were defective for uracil-DNA-glycosylase activity. They were designated ung1. Strains containing the ung1 mutation have an increased sensitivity to sodium bisulfite and sodium nitrite but a wild-type sensitivity to methyl methanesulfonate, UV light, and drugs that cause depletion of the thymidylate pool. They have a moderate mutator phenotype for nuclear but not for mitochondrial genes. A low mitochondrial uracil-DNA-glycosylase activity was demonstrated in the mutant strains.
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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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