Darvishi E~Smith ML, 2013

Pubmed ID 23718894
Title Thymol antifungal mode of action involves telomerase inhibition.
Authors Emad Darvishi, Mansoor Omidi, Ali Akbar Bushehri, Ashkan Golshani, Myron L Smith
Abstract 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.
Citation Med. Mycol. 2013; 51:826-34


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Paper Phenotype Condition Medium Collection Tested mutants Data Details
Darvishi E~Smith ML, 2013 growth (colony size) thymol [50 ug/ml] YPD hap a ~4,700 None

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