We have excised a 28-base-pair DNA fragment from the MAT alpha intergenic region and tested its ability to direct diploid-specific transcriptional repression. This fragment (1643-1671, 5'-GCTTCCCAATGTAGAAAAGTACA-TCATA-3') lies within a region required for the normal diploid-specific repression of the MAT alpha transcripts. First, the fragment was inserted into a 53-base-pair MAT alpha deletion that expresses alpha 1 and alpha 2 constitutively. Insertion of the fragment restores proper diploid regulation to the MAT alpha transcripts: alpha 1 mRNA is strongly repressed and alpha 2 mRNA is reduced by a factor of approximately equal to 10 from its haploid level. The fragment works equally well in either orientation, and two copies of the fragment do not lead to stronger repression than a single copy. We also inserted the fragment at three sites upstream of the CYC1-lacZ fusion gene. Insertions placing the regulatory fragment between the CYC1 upstream activator sequence (UAS) and the coding region make beta-galactosidase efficiently in alpha haploids but produce 1/40th the enzyme in a/alpha diploids. This diploid-specific repression requires functional MATa-1 gene product. Insertion of the MAT fragment on the opposite side of the UAS (37 base pairs upstream of the UAS) also caused diploid repression of the fusion gene, but only by a factor of 7. When the regulatory fragment is inserted at a large distance on the far side of the UAS (375 base pairs), it has little if any effect on beta-galactosidase expression. We postulate that this sequence is the operator recognized by the diploid-specific repressor.
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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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