Drosophila, destroying angels, and deathcaps! Oh my! A review of mycotoxin tolerance in the genus Drosophila

Abstract

BACKGROUND: Evolutionary novelties, be they morphological or biochemical, fascinate both scientists and non-scientists alike. These types of adaptations can significantly impact the biodiversity of the organisms in which they occur. While much work has been invested in the evolution of novel morphological traits, substantially less is known about the evolution of biochemical adaptations.

METHODS: In this review, we present the results of literature searches relating to one such biochemical adaptation: α-amanitin tolerance/resistance in the genus Drosophila.

RESULTS: Amatoxins, including α-amanitin, are one of several toxin classes found in Amanita mushrooms. They act by binding to RNA polymerase II and inhibiting RNA transcription. Although these toxins are lethal to most eukaryotic organisms, 17 mushroom-feeding Drosophila species are tolerant of natural concentrations of amatoxins and can develop in toxic mushrooms. The use of toxic mushrooms allows these species to avoid infection by parasitic nematodes and lowers competition. Their amatoxin tolerance is not due to mutations that would inhibit α-amanitin from binding to RNA polymerase II. Furthermore, the mushroom-feeding flies are able to detoxify the other toxin classes that occur in their mushroom hosts. In addition, resistance has evolved independently in several D. melanogaster strains. Only one of the strains exhibits resistance due to mutations in the target of the toxin.

CONCLUSIONS: Given our current understanding of the evolutionary relationships among the mushroom-feeding flies, it appears that amatoxin tolerance evolved multiple times. Furthermore, independent lines of evidence suggest that multiple mechanisms confer α-amanitin tolerance/resistance in Drosophila.

Key words： Drosophila; mushroom-feeding; biochemical adaptations; mushroom toxins; cyclopeptides; α-amanitin

Acknowledgments

This review was supported by an NSF grant Laura Reed and CSC and an NSF grant DEB-1737877 to TW. We would like to thank Kelly Dyer and Laura Reed for constructive discussions regarding the natural history of mushroom-feeding Drosophila, toxin tolerance, and the evolutionary relationships among these species. We would also like to thank Prajakta Kokate, Pablo Chialvo, and members of the Reed Laboratory for critical reviews of the manuscript.

Compliance with ethics guidelines

Authors declare that they have no conflict of interest. This article does not contain any studies with human or animal subjects performed by the authors.

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