Draft genome sequence and chemical profiling of Fusarium langsethiae, an emerging producer of type A trichothecenes

Erik Lysøe, Rasmus John Normand Frandsen, Hege H. Divon, Valeria Terzi, Luigi Orrù, Antonella Lamontanara, Anna Karin Kolseth, Kristian Fog Nielsen, Ulf Thrane

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Fusarium langsethiae is a widespread pathogen of small grain cereals, causing problems with T-2 and HT-2 toxin contamination in grains every year. In an effort to better understand the biology of this fungus, we present a draft genome sequence of F. langsethiae Fl201059 isolated from oats in Norway. The assembly was fragmented, but reveals a genome of approximately 37.5 Mb, with a GC content around 48%, and 12,232 predicted protein-coding genes. Focusing on secondary metabolism we identified candidate genes for 12 polyketide synthases, 13 non-ribosomal peptide synthetases, and 22 genes for terpene/isoprenoid biosynthesis. Some of these were found to be unique compared to sequence databases. The identified putative Tri5 cluster was highly syntenic to the cluster reported in F. sporotrichioides. Fusarium langsethiae Fl201059 produces a high number of secondary metabolites on Yeast Extract Sucrose (YES) agar medium, dominated by type A trichothecenes. Interestingly we found production of glucosylated HT-2 toxin (Glu-HT-2), previously suggested to be formed by the host plant and not by the fungus itself. In greenhouse inoculations of F. langsethiae Fl201059 on barley and oats, we detected the type A trichothecenes: neosolaniol, HT-2 toxin, T-2 toxin, Glu-HT-2 and numerous derivatives of these.
    Original languageEnglish
    JournalInternational Journal of Food Microbiology
    Volume221
    Pages (from-to)29-36
    Number of pages8
    ISSN0168-1605
    DOIs
    Publication statusPublished - 2016

    Keywords

    • Food Science
    • Microbiology
    • Safety, Risk, Reliability and Quality
    • Cereals
    • Fusarium langsethiae
    • Genome
    • Glucosylated mycotoxins
    • HT-2 toxin
    • Oats
    • Secondary metabolism
    • T-2 toxin

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