Mutants of Saccharomyces cerevisiae that are derepressed for meiosis and spore formation have been isolated and characterized genetically. All are the result of single, recessive nuclear mutations that fall into four linkage groups. Three of these groups are represented by spd1, spd3 and spd4 mutations, which in homozygous diploids confer poor growth and extensive sporulation on a range of non-fermentable media. Haploids carrying any of these mutations are arrested under these conditions in the G1 phase of the cell division cycle as large unbudded cells. The alleles of the spd2 mutation complemented all other mutations but were very closely linked to the spd1 locus. The fourth linkage group was represented by a mutation conferring temperature-sensitive growth and derepressed sporulation on homozygous diploids grown between 25 degrees C and 30 degrees C on media containing galactose or glycerol, but not glucose, as energy source. Above 30 degrees C this mutant lysed on all media. The mutation it carried failed to complement available cdc25 mutations. These data bring to five the number of loci at which mutation can lead to derepressed sporulation (spd1, spd3, spd4, cdc25 and cdc35). The spd1 locus has been mapped 13.9 cM to the left of the centromere on chromosome XV, adjacent to the SUP3 gene. Diploid strains homozygous for spd mutations are genetically unstable, giving rise to asporogenous mutants at high frequency, usually as the result of a second mutation unlinked to the spd mutation. Diploids homozygous for these mutations, and for spd mutations, show an altered regulation of the formulation of at least three polypeptides normally subject to carbon source repression.
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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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