Eukaryotes repair DNA double-strand breaks (DSBs) by homologous recombination (HR) or by nonhomologous end-joining (NHEJ). DSBs are a natural consequence of DNA metabolism, occurring, for example, during DNA replication and meiosis. DSBs are also induced by chemicals and radiation. I-SceI endonuclease recognizes an 18-bp sequence with little degeneracy; therefore I-SceI is highly specific, and its recognition sequence is predicted to occur by chance less than once in even the largest known genomes. As such, I-SceI can be used to introduce a DSB into a defined (engineered) site in a mammalian chromosome, and this facilitates detailed studies of DSB repair. DSBs induced in repeated regions can be repaired by several different HR processes, including gene conversion with or without associated crossovers, or single-strand annealing. The specific types of HR events that can be scored depend on the configuration of the repeated regions and whether selection for recombinants is imposed. Nonselective assays detect both HR and NHEJ events. This chapter focuses on the systems for delivering I-SceI nuclease to mammalian cells and the strategies for detecting various outcomes of DSB repair.
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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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