The 5' end of eukaryotic mRNAs are modified by the addition of a 7-methyl guanosine (m7G) cap. The role of the cap in translation has been well established. Additionally, studies conducted in vitro or in microinjected Xenopus oocytes have implicated the cap in RNA processing and transport. To determine the fate of uncapped mRNA in intact yeast cells, conditional alleles of the gene encoding the capping enzyme guanylyltransferase subunit (CEG1) were generated. RNA analysis of temperature-sensitive ceg1 strains revealed an accumulation of unspliced pre-mRNAs and a corresponding decrease in spliced mRNAs at the restrictive temperature. A substantial proportion of spliced mRNA was also uncapped. Therefore, the cap appears to stimulate, but is not absolutely required for, splicing in vivo. In addition, steady-state levels of several mRNAs were decreased, perhaps due to increased degradation of uncapped mRNAs. In contrast to splicing, mRNA polyadenylation and transport to the cytoplasm were unaffected.
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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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