By pulsed-field gel electrophoresis of chromosomal DNA and hybridization with a cloned MTH1 (CUP1) gene, we determined the locations of metallothionein-encoding gene sequences on chromosomes in monosporic cultures of 76 natural strains of Saccharomyces cerevisiae. Most of the strains (68) exhibited a previously known location for the MTH sequence on chromosome (chr.) VIII. Seven strains (resistant or sensitive to Cu2+) showed a MTH sequence in a new locus, MTH2, on chr. XVI. One strain carried an MTH locus on both chromosomes VIII and XVI. Restriction fragment and Southern blot analyses showed that the two MTH loci were very closely related. The strains displayed heterogeneity in the size and structure of their MTH2 locus. The length of the repeat unit of MTH2 varied: a 1.9-kb or 1.7-kb unit was found, instead of the 2.0-kb unit of the MTH1 locus. The most resistant strain (resistant to 1.2 mM CuSO4) contained a 0.9-kb repeat unit in addition to those of 1.9 kb and 1.7 kb. All three sensitive (to over 0.3 mM CuSO4) strains with an mth2 locus had a repeat unit of 1.9 kb or 1.7 kb, suggesting the presence of at least two copies of the MTH2 gene, with one always being in the junction area outside of the repeat unit. A monogenic tetrad segregation of 2:2 was usually found in crosses of resistant MTH2 and sensitive mth2 strains. Hybrids between strains with different MTH loci in all combinations showed low ascospore viability, suggesting that the complete lack of an MTH locus may lead to the death of segregants on YPD medium. The MTH1 and MTH2 loci were exchangeable. Strains with a high level of Cu2+ resistance were also resistant to Cd2+. However, these two properties did not cosegregate in heterozygotic hybrids.
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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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| 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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