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DNA adduct formation in Saccharomyces cerevisiae following exposure to environmental pollutants, as in vivo model for molecular toxicity studies

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Abstract

DNA adduction in the model yeast Saccharomyces cerevisiae was investigated after exposure to the fungicide penconazole and the reference genotoxic compound benzo(a)pyrene, for validating yeasts as a tool for molecular toxicity studies, particularly of environmental pollution. The effect of the toxicants on the yeast’s growth kinetics was determined as an indicator of cytotoxicity. Fermentative cultures of S. cerevisiae were exposed to 2 ppm of Penconazole during different phases of growth; while 0.2 and 2 ppm of benzo(a)pyrene were applied to the culture medium before inoculation and on exponential cultures. Exponential respiratory cultures were also exposed to 0.2 ppm of B(a)P for comparison of both metabolisms. Penconazole induced DNA adducts formation in the exponential phase test; DNA adducts showed a peak of 54.93 adducts/109 nucleotides. Benzo(a)pyrene induced the formation of DNA adducts in all the tests carried out; the highest amount of 46.7 adducts/109 nucleotides was obtained in the fermentative cultures after the exponential phase exposure to 0.2 ppm; whereas in the respiratory cultures, 14.6 adducts/109 nucleotides were detected. No cytotoxicity was obtained in any experiment. Our study showed that yeast could be used to analyse DNA adducts as biomarkers of exposure to environmental toxicants.

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The datasets generated during and/or analysed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors thank the Research Council of Saint Joseph University of Beirut and the Laboratoire de Génie Chimique UMR-CNRS/INPT/UPS 5503 for the financial support.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Annie Pfohl-Leszkowicz and Pierre Strehaiano designed the study. Roger Lteif set up the collaboration between Lebanon and France. Dalal Jawich carried out the microbial cultures in Pierre Strehaiano and Roger Lteif teams, and DNA adducts analysis in Annie Pfohl-Leszkowicz team. Dalal Jawich analysed the data and prepared draft figures and tables. Dalal Jawich prepared the manuscript draft with important proofreading from Annie Pfohl-Leszkowicz, Pierre Strehaiano, and Roger Lteif. All authors approved the final manuscript and had complete access to the study data.

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Correspondence to Dalal Jawich.

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Jawich, D., Pfohl-Leszkowicz, A., Lteif, R. et al. DNA adduct formation in Saccharomyces cerevisiae following exposure to environmental pollutants, as in vivo model for molecular toxicity studies. World J Microbiol Biotechnol 40, 180 (2024). https://doi.org/10.1007/s11274-024-03989-x

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  • DOI: https://doi.org/10.1007/s11274-024-03989-x

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