DNA replication-coupled chromatin assembly is crucial to maintain genome integrity. Here, we demonstrate that the absence of the budding yeast histone chaperone CAF-1 induces the production of extrachromosomal ribosomal RNA gene (rDNA) circles (ERCs), accompanied by chromosomal rDNA copy number changes, in a manner dependent on Fob1-mediated DNA replication fork arrest in the rDNA, the homologous recombination (HR) protein Rad52, and its interaction with proliferating cell nuclear antigen. In the caf-1 mutant, ERC production is triggered partly by increased transcription from the regulatory promoter E-pro, but is also affected by defects independent of E-pro misregulation. Absence of CAF-1 accumulates resected DNA double-strand breaks (DSBs) formed at arrested replication forks, repair of which leads to enhanced ERC formation. CAF-1 deficiency causes partial defects in lagging strand synthesis coupled to nucleosome spacing in the rDNA. Our findings suggest that CAF-1 suppresses HR-mediated rDNA instability during repair of replication-coupled DSBs.
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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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