Resting cysts of Sterkiella histriomuscorum (Ciliophora, Oxytrichidae) have been shown to contain messenger RNA, one of which codes for a protein significantly similar to CROC-1. CROC-1 is a human regulatory protein capable of transactivating the promoter of c-fos and belongs to a newly characterized family of ubiquitin-conjugating enzyme (E2) variants (UEV). We have determined the corresponding macronuclear gene sequence, which is the first protistan UEV sequence available. The phylogenetic analysis indicates the deep separation and solid clustering of all the UEV sequences within the E2 tree showing the ancient origin of these regulatory genes and their high structural conservation during evolution. Furthermore, overexpression of the ciliate UEV is able to rescue the Saccharomyces cerevisiae mms2 null mutant from killing by DNA damaging agents, implying that the UEV family proteins are functionally conserved. In S. histriomuscorum, expression of UEV is correlated with the growth of the cells as transcripts are present in excysting and vegetative cells but are rapidly down-regulated during starvation. These data support the high conservation of the UEV family in eukaryotes, and a regulatory role of the gene is discussed in relation to known functions of UEVs. This analysis may promote the search for homologues of other regulatory genes (metazoan regulators of differentiation) in ciliates.
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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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