The complete genome of the yeast Saccharomyces cerevisiae was investigated for intrachromosomal duplications at the level of nucleotide sequences. The analysis was performed by looking for long approximate repeats (from 30 to 3,885 bp) present on each of the chromosomes. We show that direct and inverted repeats exhibit very different characteristics: the two copies of direct repeats are more similar and longer than those of inverted repeats. Furthermore, contrary to the inverted repeats, a large majority of direct repeats appear to be closely spaced. The distance (delta) between the two copies is generally smaller than 1 kb. Further analysis of these "close direct repeats" shows a negative correlation between delta and the percentage of identity between the two copies, and a positive correlation between delta and repeat length. Moreover, contrary to the other categories of repeats, close direct repeats are mostly located within coding sequences (CDSs). We propose two hypotheses in order to interpret these observations: first, the deletion/conversion rate is negatively correlated with delta; second, there exists an active duplication mechanism which continuously creates close direct repeats, the other intrachromosomal repeats being the result, by chromosomal rearrangements of these "primary repeats."
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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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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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