1A6/DRIM is a nucleolar protein with a nucleolar targeting sequence in its 3'-terminus. Bioinformatic analysis indicated that human 1A6/DRIM shares 23% identity and 43% similarity with yeast Utp20, which has been reported as a component of U3 snoRNA protein complex and has been implicated in 18S rRNA processing. In the present study, we found, by utilizing RT-PCR with RNA extracted from anti-1A6/DRIM immunoprecipitates and Northern blotting, that 1A6/DRIM is associated with U3 snoRNA. Pulse-chase labeling assays showed that silencing of 1A6/DRIM expression in HeLa cells resulted in a delayed 18S rRNA processing. Furthermore, immunoprecipitations revealed that 1A6/DRIM was also associated with fibrillarin, another U3 RNP component in HeLa cells. These results indicate that 1A6/DRIM is involved in 18S rRNA processing and is the bona fide mammalian Utp20.
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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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