We have developed a two-dimensional method for simultaneously mapping on the yeast mtDNA genome all the transcripts representing more than 0.01% of mtRNA. In two yeast strains, Saccharomyces carlsbergensis NCYC-74 and Saccharomyces cerevisiae KL14-4A, about 25 discrete transcripts were found apart from tRNAs. The mtDNAs of these strains differ by the absence (NCYC-74) or presence (KL 14-4A) of various large insertions located within genetically active regions. The transcripts can all be related to known loci on the genetic map. In nearly all cases the RNAs are much longer than required to specify the known protein product of the locus concerned. The organization of the transcripts is similar in the two strains except at the positions of the large insertions (500-3300 bp) in the oxi-3 and cob loci. The sequences of these insertions are present in RNA species larger than 25S, but are absent from smaller transcripts of the same regions. This is probably due to splicing, since the coding sequences for most of these smaller transcripts are noncontiguous. The smaller transcripts of other loci also seem to arise from processing of larger RNA species. The oxi-3 locus, containing the structural gene for cytochrome c oxidase subunit l, is transcribed in a very complex fashion that suggests differential splicing into partially overlapping transcripts. This may indicate that oxi-3 has additional genetic functions, including possible control of the biosynthesis of cytochrome c oxidase holoenzyme or its assembly into the mitochondrial inner membrane. As in the case of the eucaryote nucleus, the regulation of mitochondrial gene expression seems to occur more at the level of RNA processing than has been recognized thus far.
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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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