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Function of crzA in Fungal Development and Aflatoxin Production in Aspergillus flavus
Open AccessReview

Aflatoxin Biosynthesis and Genetic Regulation: A Review

1
Toxalim (Research Center in Food Toxicology), Université de Toulouse, INRAE, ENVT, EI-Purpan, 31300 Toulouse, France
2
Centre d’analyse et de recherche, Unité de recherche technologies et valorisations agro-alimentaires, Faculté des Sciences, Université Saint-Joseph, P.O. Box 17-5208, Mar Mikhael Beirut 1104, Lebanon
3
Laboratory of Microbiology, Department of Life and Earth Sciences, Faculty of Sciences I, Lebanese University, Hadath Campus, P.O. Box 5, Beirut 1104, Lebanon
*
Author to whom correspondence should be addressed.
Authors equally contributed to this work.
Toxins 2020, 12(3), 150; https://doi.org/10.3390/toxins12030150
Received: 19 December 2019 / Revised: 27 January 2020 / Accepted: 25 February 2020 / Published: 28 February 2020
(This article belongs to the Special Issue Production Mechanisms and Biosynthesis of Aflatoxin)
The study of fungal species evolved radically with the development of molecular techniques and produced new evidence to understand specific fungal mechanisms such as the production of toxic secondary metabolites. Taking advantage of these technologies to improve food safety, the molecular study of toxinogenic species can help elucidate the mechanisms underlying toxin production and enable the development of new effective strategies to control fungal toxicity. Numerous studies have been made on genes involved in aflatoxin B1 (AFB1) production, one of the most hazardous carcinogenic toxins for humans and animals. The current review presents the roles of these different genes and their possible impact on AFB1 production. We focus on the toxinogenic strains Aspergillus flavus and A. parasiticus, primary contaminants and major producers of AFB1 in crops. However, genetic reports on A. nidulans are also included because of the capacity of this fungus to produce sterigmatocystin, the penultimate stable metabolite during AFB1 production. The aim of this review is to provide a general overview of the AFB1 enzymatic biosynthesis pathway and its link with the genes belonging to the AFB1 cluster. It also aims to illustrate the role of global environmental factors on aflatoxin production and the recent data that demonstrate an interconnection between genes regulated by these environmental signals and aflatoxin biosynthetic pathway. View Full-Text
Keywords: aflatoxin; biosynthesis; gene regulation; Aspergillus aflatoxin; biosynthesis; gene regulation; Aspergillus
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Caceres, I.; Al Khoury, A.; El Khoury, R.; Lorber, S.; P. Oswald, I.; El Khoury, A.; Atoui, A.; Puel, O.; Bailly, J.-D. Aflatoxin Biosynthesis and Genetic Regulation: A Review. Toxins 2020, 12, 150.

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