In the ribosomal DNA (rDNA) of Saccharomyces cerevisiae replication forks progressing against transcription stall at a polar replication fork barrier (RFB) located close to and downstream of the 35S transcription unit. Forks blocked at this barrier are potentially recombinogenic. Plasmids bearing the RFB sequence in its active orientation integrated into the chromosomal rDNA in sir2 mutant cells but not in wild-type cells, indicating that the histone deacetylase silencing protein Sir2 (Sir2p), which also modulates the aging process in yeast, suppresses the recombination competence of forks blocked at the rDNA RFB. Orientation of the RFB sequence in its inactive course or its abolition by FOB1 deletion avoided plasmid integration in sir2 mutant cells, indicating that stalling of the forks in the plasmid context was required for recombination to take place. Altogether these results strongly suggest that one of the functions of Sir2p is to modulate access of the recombination machinery to the forks stalled at the rDNA RFB.
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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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