Three mutants were identified in a genetic screen using an INO1-lacZ fusion to detect altered INO1 regulation in Saccharomyces cerevisiae. These strains harbor mutations that render the cell unable to fully repress expression of INO1, the structural gene for inositol-1-phosphate synthase. The Cpe-(constitutive phospholipid gene expression) phenotype associated with these mutations segregated 2:2, indicating that it was the result of a single gene mutation. The mutations were shown to be recessive and allelic. A strain carrying the tightest of the three alleles was examined in detail and was found to express the set of co-regulated phospholipid structural genes (INO1, CHO1, CHO2 and OP13) constitutively. The Cpe- mutants also exhibited a pleiotropic defect in sporulation. The mutations were mapped to the right arm of chromosome XV, close to the centromere, where it was discovered that they were allelic to the previously identified regulatory mutation sin3 (sdi1, ume4, rpd1, gam2). A sin3 null mutation failed to complement the mutation conferring the Cpe- phenotype. A mutant harboring a sin3 null allele exhibited the same altered INO1 expression pattern observed in strains carrying the Cpe- mutations isolated in this study.
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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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