A putative homologue of the Saccharomyces cerevisiae Ste12 transcription factor was identified in a series of expressed sequence tag-based microarray analyses as being down-regulated in strains of the chestnut blight fungus, Cryphonectria parasitica, infected by virulence-attenuating hypoviruses. Cloning of the corresponding gene, cpst12, confirmed a high level of similarity to Ste12 homologues of other filamentous fungi. Disruption of cpst12 resulted in no alterations in in vitro growth characteristics or colony morphology and an increase in the production of asexual spores, indicating that CpST12 is dispensable for vegetative growth and conidiation on artificial medium. However, the disruption mutants showed a very substantial reduction in virulence on chestnut tissue and a complete loss of female fertility, two symptoms normally conferred by hypovirus infection. Both virulence and female fertility were restored by complementation with the wild-type cpst12 gene. Analysis of transcriptional changes caused by cpst12 gene disruption with a custom C. parastica cDNA microaray chip identified 152 responsive genes. A significant number of these putative CpST12-regulated genes were also responsive to hypovirus infection. Thus, cpst12 encodes a cellular transcription factor, CpST12, that is down-regulated by hypovirus infection and required for female fertility, virulence and regulated expression of a subset of hypovirus responsive host genes.
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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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