
handle: 11573/1680943
Fatty acids (FA) are a metabolic energy source and are building blocks of membrane lipids; moreover, they play a role in the signaling among hosts and pathogens. The ascomycete Fusarium verticillioides is a pathogenic fungus of maize; it is a valuable organism for elucidating processes in eukaryotic cell such as fatty acid metabolism. Oxidized FA, i.e. the oxylipins, are important driver of the host-pathogen interaction. Previous studies assessed that their synthesis appear tightly coordinated within the subset of oxylipin-related genes and with the genes controlling the synthesis of FA. We suggest here that the calcium-regulated transcription factor Crz1 (orthologue in F. verticillioides Fvcrz1) is probably involved in the upstream regulation of several genes related to fatty acid and oxylipin synthesis. Through a transcriptomic and metabolomics approach, we analyzed gene expression and FA synthesis in F. verticillioides wild type and mutant strain crz1 under in vitro conditions. Notably, we evaluated the expression of genes related to the FA biosynthesis, transformation, and oxylipins synthesis. Transcriptomic approach was associated to a mass spectrometry analysis to quantify several lipids. Apparently and intriguingly, Crz1 did not affect - significantly - the expression of FA- and oxylipin-related genes but controlled the total amount of FA and oxylipin in F. verticillioides. In fact, FA and oxylipin amount is reduced significantly in crz1 compared to WT strain whilst gene expression resulted almost unscathed. Advances in understanding such processes in F. verticillioides will provide helpful insights to the study of lipid-mediated cross talk within fungus-plant interaction.
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