We have studied the meiotic segregation of a chromosome length polymorphism (CLP) in the yeast Saccharomyces cerevisiae. The neopolymorphism frequently observed within the smallest chromosomes (I, VI, III and IX) is not completely understood. We focused on the analysis of the structure of chromosome I in 88 segregants from a cross between YNN295 and FL100trp. Strain FL100trp is known to carry a reciprocal translocation between the left arm of chromosome III and the right arm of chromosome I. PCR and Southern hybridization analyses were performed and a method for the rapid detection of chromosome I rearrangements was developed. Seven chromosome I types were identified among the 88 segregants. We detected 22 recombination events between homologous chromosomes I and seven ectopic recombination events between FL100trp chromosome III and YNN295 chromosome I. These recombination events occurred in 20 of the 22 tetrads studied (91%). Nine tetrads (41%) showed two recombination events. This showed that homologous recombination involving polymorphic homologues or heterologous chromosomes is the main source of neopolymorphism. Only one of the seven chromosome I variants resulted from a transposition event rather than a recombination event. We demonstrated that a Tyl element had transposed within the translocated region of chromosome I, generating mutations in the 3' LTR, at the border between U5 and PBS.
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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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