Abstract Illegitimate recombination can repair DNA double-strand breaks in one of two ways, either without sequence homology or by using a few base pairs of homology at the junctions. The second process is known as microhomology-mediated recombination. Previous studies showed that ionizing radiation and restriction enzymes increase the frequency of microhomology-mediated recombination in trans during rejoining of unirradiated plasmids or during integration of plasmids into the genome. Here we show that radiation-induced microhomology-mediated recombination is reduced by deletion of RAD52, RAD1 and RAD10 but is not affected by deletion of RAD51 and RAD2. The rad52 mutant did not change the frequency of radiation-induced microhomology-mediated recombination but rather reduced the length of microhomology required to undergo repair during radiation-induced recombination. The rad1 and rad10 mutants exhibited a smaller increase in the frequency of radiation-induced microhomology-mediated recombination, and the radiation-induced integration junctions from these mutants did not show more than 4 bp of microhomology. These results suggest that Rad52 facilitates annealing of short homologous sequences during integration and that Rad1/Rad10 endonuclease mediates removal of the displaced 3' single-stranded DNA ends after base-pairing of microhomology sequences, when more than 4 bp of microhomology are used. Taken together, these results suggest that radiation-induced microhomology-mediated recombination is under the same genetic control as the single-strand annealing apparatus that requires the RAD52, RAD1 and RAD10 genes.
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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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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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