Transcriptomic responses of Aspergillus flavus to temperature and oxidative stresses during aflatoxin production

• Published in: Scientific reports Vol. 11; no. 1; pp. 2803 - 12
• Main Authors: Tian, Fei, Lee, Sang Yoo, Woo, So Young, Choi, Hwa Young, Heo, Seongeun, Nah, Gyoungju, Chun, Hyang Sook
• Format: Journal Article
• Language: English
• Published: England Nature Publishing Group 02.02.2021; Nature Publishing Group UK; Nature Portfolio
• Subjects: Aflatoxins; Aflatoxins - analysis; Aflatoxins - biosynthesis; Aflatoxins - toxicity; Alternative oxidase; Antioxidants; Aspergillus flavus; Aspergillus flavus - genetics; Aspergillus flavus - metabolism; Biosynthesis; Cell culture; Cell survival; Computational Biology; Crops, Agricultural - microbiology; Cytochrome c; Developmental stages; Electron transport; Environmental stress; Food contamination; Food Microbiology; Food security; Gene expression; Gene Expression Regulation, Fungal; Heat-Shock Response - genetics; Homeostasis; Hot Temperature - adverse effects; Kojic acid; Livestock; Metabolic Networks and Pathways - genetics; Metabolic pathways; Metabolites; Mitochondria; NADH; NADH-ubiquinone oxidoreductase; Oxidative stress; Oxidative Stress - genetics; Pollution prevention; Pyrones - metabolism; RNA, Fungal - isolation & purification; RNA, Fungal - metabolism; RNA-Seq; Secondary Metabolism - genetics; Secondary metabolites; Spores, Fungal; Transcriptomes; Ubiquinol; Ubiquinone; Ubiquinone oxidoreductase
• DOI: 10.1038/s41598-021-82488-7
• ISSN: 2045-2322

Aflatoxin is a group of polyketide-derived carcinogenic and mutagenic secondary metabolites produced by Aspergillus flavus that negatively impact global food security and threaten the health of both humans and livestock. Aflatoxin biosynthesis is strongly affected by the fungal developmental stage, cultivation conditions, and environmental stress. In this study, a novel float culture method was used to examine the direct responses of the A. flavus transcriptome to temperature stress, oxidative stress, and their dual effects during the aflatoxin production stage. The transcriptomic response of A. flavus illustrated that the co-regulation of different secondary metabolic pathways likely contributes to maintaining cellular homeostasis and promoting cell survival under stress conditions. In particular, aflatoxin biosynthetic gene expression was downregulated, while genes encoding secondary metabolites with antioxidant properties, such as kojic acid and imizoquins, were upregulated under stress conditions. Multiple mitochondrial function-related genes, including those encoding NADH:ubiquinone oxidoreductase, ubiquinol-cytochrome C reductase, and alternative oxidase, were differentially expressed. These data can provide insights into the important mechanisms through which secondary metabolism in A. flavus is co-regulated and facilitate the deployment of various approaches for the effective control and prevention of aflatoxin contamination in food crops.