Telomeres were defined by their ability to cap chromosome ends. Proteins with high affinity for the structure at chromosome ends, binding the G-rich, 3' single-stranded overhang at telomeres include Pot1 in humans and fission yeast, TEBP in Oxytricha nova and Cdc13 in budding yeast. Cdc13 is considered essential for telomere capping because budding yeast that lack Cdc13 rapidly accumulate excessive single-stranded DNA (ssDNA) at telomeres, arrest cell division and die. Cdc13 has a separate, critical role in telomerase recruitment to telomeres. Here, we show that neither Cdc13 nor its partner Stn1 are necessary for telomere capping if nuclease activities that are active at uncapped telomeres are attenuated. Recombination-dependent and -independent mechanisms permit maintenance of chromosomes without Cdc13. Our results indicate that the structure of the eukaryotic telomere cap is remarkably flexible and that changes in the DNA damage response allow alternative strategies for telomere capping to evolve.
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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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