In experiments involving deletion and rearrangement of intron sequences two small regions of the intron in the yeast CYH2 ribosomal protein gene were found to play important roles in splicing of the pre-mRNA. One element lies downstream of the 5' splice site, and the other is upstream of the branchpoint sequence UACUAAC. Deletion of the element upstream of the branchpoint prevents spliceosome formation and blocks splicing in vivo and in vitro. Deletion of the element downstream of the 5' splice site does not on its own block splicing but rescues spliceosome formation and splicing of pre-mRNA lacking the element upstream of the branchpoint. These elements correspond to two regions of sequence complementarity which are a conserved feature of the introns in yeast pre-mRNAs. Mixing and matching of the elements from the ACT1 and CYH2 gene introns showed that these elements can cooperate in an intron-specific fashion to control spliceosome assembly.
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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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