The antifungal mode of action of thymol was investigated by a chemical-genetic profile analysis. Growth of each of ~4700 haploid Saccharomyces cerevisiae gene deletion mutants was monitored on medium with a subinhibitory concentration (50 μg/ml) of thymol and compared to growth on non-thymol control medium. This analysis revealed that, of the 76 deletion mutants with the greatest degree of susceptibility to thymol, 29% had deletions in genes involved in telomere length maintenance. A telomere restriction fragment (TRF) length assay showed that yeast exposed to a subinhibitory concentration of thymol for 15 days had telomere size reductions of 13-20% compared to non-thymol controls. By accelerating telomere shortening, thymol may increase the rate of cell senescence and apoptosis. Furthermore, real-time RT-PCR analysis revealed approximately two-fold reductions in EST2 mRNA but no change in TLC1 RNA in thymol-treated S. cerevisiae relative to untreated cells. EST2 encodes the essential reverse transcriptase subunit of telomerase that uses TLC1 RNA as a template during addition of TG(1-3) repeats to maintain telomere ends. This study provides compelling evidence that a primary mode of thymol antifungal activity is through inhibition of transcription of EST2 and thus telomerase activity.
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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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