We studied a Cryptococcus neoformans strain that caused feline chronic nasal granuloma without disseminated disease. This strain, B-4551, grows at temperatures up to 35 degrees C and fails to cause systemic infection in mice. Many cells of B-4551 formed short hyphal elements in feline nasal tissue and occasionally at 35 degrees C in vitro. A complementation and sequence analysis revealed that the temperature-sensitive (Ts) phenotype of B-4551 was due to deletion of a lysine residue in the cryptococcal CCN1 gene. B-4551 complemented with the wild type CCN1 gene grew at 37 degrees C and caused fatal systemic infection in mice. The CCN1 gene encodes a protein containing 16 copies of a tetratricopeptide repeat. CCN1 is homologous to the Saccharomyces cerevisiae CLF1 gene, which is required for pre-mRNA splicing, cell cycle progression, and DNA replication, and to the Drosophila melanogaster crn gene, which is involved in neurogenesis. CLF1 complemented the Ts phenotype of B-4551. CCN1, however, failed to rescue the clf1 mutant in S. cerevisiae. These results indicate that the Ccn1p may not be as functionally diverse as Clf1p in yeast.
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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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