After selection for migration into the nucleus, a cytoplasmic yeast linear plasmid bearing an inverted terminal repeat (ITRs) at each end replicates in Saccharomyces cerevisiae in a linear form, called pTLU, which carries host telomeric repeats (TG(1-3))(n) of about 300-350 bp added to the ITR ends. We previously showed that the nucleotide composition of the added telomeric sequences varied among individual pTLU isolates, while those on the two ends of any given pTLU were always identical. The telomeric sequences of pTLU remained unchanged over numbers of cell generations when cells were selected for expression of the plasmid-borne nuclear marker. We report here that progressive alterations in telomeric sequences can be detected in cells which are grown under non-selective conditions. Surprisingly, in any given molecule, the telomeric alterations occur exclusively on one side, either the left or the right end, while the sequence at the opposite end remained identical to the original, suggesting a difference in the mode of DNA replication between the plasmid ends. These alterations occur over a broad area extending from the termini of telomeres to nucleotides near the junction between the telomeric sequences and the pTLU-ITR, implying that the plasmid ends undergo successive rounds of extension and contraction. Clonal analysis under non-selective conditions indicated that the alterations in telomeric sequences are generally associated with extreme instability of the pTLU plasmid.
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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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