Different Toxicity Mechanisms for Citrinin and Ochratoxin A Revealed by Transcriptomic Analysis in Yeast

[EN] Citrinin (CIT) and ochratoxin A (OTA) are important mycotoxins, which frequently co-contaminate foodstuff. In order to assess the toxicologic threat posed by the two mycotoxins separately or in combination, their biological effects were studied here using genomic transcription profiling and specific live cell gene expression reporters in yeast cells. Both CIT and OTA cause highly transient transcriptional activation of different stress genes, which is greatly enhanced by the disruption of the multidrug exporter Pdr5. Therefore, we performed genome-wide transcription profiling experiments with the pdr5 mutant in response to acute CIT, OTA, or combined CIT/OTA exposure. We found that CIT and OTA activate divergent and largely nonoverlapping gene sets in yeast. CIT mainly caused the rapid induction of antioxidant and drug extrusion-related gene functions, while OTA mainly deregulated developmental genes related with yeast sporulation and sexual reproduction, having only a minor effect on the antioxidant response. The simultaneous exposure to CIT and OTA gave rise to a genomic response, which combined the specific features of the separated mycotoxin treatments. The application of stress-specific mutants and reporter gene fusions further confirmed that both mycotoxins have divergent biological effects in cells. Our results indicate that CIT exposure causes a strong oxidative stress, which triggers a massive transcriptional antioxidant and drug extrusion response, while OTA mainly deregulates developmental genes and only marginally induces the antioxidant defense.We thank Lorena Latorre and Javier Forment for their help with the microarray experiments and data analysis. This work was funded only in the initial phase by a grant from Ministerio de Economía y Competitividad (BFU2011-23326). We thank the Fond for Open Access Publication from Consejo Superior de Investigaciones Científicas (CSIC) for supporting publication costs of this article.Vanacloig-Pedrós, E.; Proft, MH.; Pascual-Ahuir Giner, MD. (2016). Different Toxicity Mechanisms for Citrinin and Ochratoxin A Revealed by Transcriptomic Analysis in Yeast. Toxins. 8(10):1-20. https://doi.org/10.3390/toxins8100273120810Bennett, J. W., & Klich, M. (2003). Mycotoxins. Clinical Microbiology Reviews, 16(3), 497-516. doi:10.1128/cmr.16.3.497-516.2003Marroquín-Cardona, A. G., Johnson, N. M., Phillips, T. D., & Hayes, A. W. (2014). Mycotoxins in a changing global environment – A review. Food and Chemical Toxicology, 69, 220-230. doi:10.1016/j.fct.2014.04.025Moretti, A., Susca, A., Mulé, G., Logrieco, A. F., & Proctor, R. H. (2013). Molecular biodiversity of mycotoxigenic fungi that threaten food safety. 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