Splicing enhancement in higher eukaryotes has been linked to SR proteins, to U1 snRNP, and to communication between splice sites across introns or exons mediated by protein-protein interactions. It has been previously shown that, in yeast, communication mediated by RNA-RNA interactions between the two ends of introns is a basis for splicing enhancement. We designed experiments of randomization-selection to isolate splicing enhancers that would work independently from RNA secondary structures. Surprisingly, one of the two families of sequences selected was essentially composed of 5' splice site variants. We show that this sequence enhances splicing independently of secondary structure, is exportable to heterologous contexts, and works in multiple copies with additive effects. The data argue in favor of an early role for splicing enhancement, possibly coincident with commitment complex formation. Genetic compensation experiments with U1 snRNA mutants suggest that U1 snRNP binding to noncanonical locations is required for splicing enhancement.
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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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