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The discovery of homologues from the yeast Saccharomyces cerevisiae of the human Ku DNA-end-binding proteins (HDF1 and KU80) has established that this organism is capable of non-homologous double-strand end joining (NHEJ), a form of DNA double-strand break repair (DSBR) active in mammalian V(D)J recombination. Identification of the DNA ligase that mediates NHEJ in yeast will help elucidate the function of the four mammalian DNA ligases in DSBR, V(D)J recombination and other reactions. Here we show that S. cerevisiae has two typical DNA ligases, the known DNA ligase I homologue CDC9 and the previously unknown DNA ligase IV homologue DNL4. dnl4 mutants are deficient in precise and end-processed NHEJ. DNL4 and HDF1 are epistatic in this regard, with the mutation of each having equivalent effects. dnl4 mutants are complemented by overexpression of Dnl4 but not of Cdc9, and deficiency of Dnl4 alone does not impair either cell growth or the Cdc9-mediated responses to ionizing and ultraviolet radiation. Thus, S. cerevisiae has two distinct and separate ligation pathways.
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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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