We have developed a novel technique for combined immunofluorescence/in situ hybridization on fixed budding yeast cells that maintains the three-dimensional structure of the nucleus as monitored by focal sections of cells labeled with fluorescent probes and by staining with a nuclear pore antibody. Within the resolution of these immunodetection techniques, we show that proteins encoded by the SIR3, SIR4, and RAP1 genes colocalize in a statistically significant manner with Y' telomere-associated DNA sequences. In wild-type cells the Y' in situ hybridization signals can be resolved by light microscopy into fewer than ten foci per diploid nucleus. This suggests that telomeres are clustered in vegetatively growing cells, and that proteins essential for telomeric silencing are concentrated at their sites of action, i.e., at telomeres and/or subtelomeric regions. As observed for Rap1, the Sir4p staining is diffuse in a sir3- strain, and similarly, Sir3p staining is no longer punctate in a sir4- strain, although the derivatized Y' probe continues to label discrete sites in these strains. Nonetheless, the Y' FISH is altered in a qualitative manner in sir3 and sir4 mutant strains, consistent with the previously reported phenotypes of shortened telomeric repeats and loss of telomeric silencing.
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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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Evidence ID | Analyze ID | File | Description |
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