Detection of Chaetomium globosum, Ch. cochliodes and Ch. rectangulare during the Diversity Tracking of Mycotoxin-Producing Chaetomium-Like Isolates Obtained in Buildings in Finland

Johanna M. Salo*, Orsolya Kedves, Raimo Mikkola, László Kredics, Maria A. Andersson, Jarek Kurnitski, Heidi Salonen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)
33 Downloads (Pure)

Abstract

The diversity of Chaetomium-like isolates in buildings in Finland is poorly documented. This paper describes a set of methods for rapid diversity tracking of 42 indoor Chaetomium-like isolates. These isolates were categorized based on their fluorescence emission, ascomatal hair morphology, responses in three bioassays and resistance/sensitivity to the wetting agent Genapol X-080. Thirty-nine toxigenic isolates were identified [Ch. globosum (n = 35), Ch. cochliodes (n = 2) and Ch. rectangulare (n = 2)]. These isolates were identified down to the species level by tef1α gene sequencing. The major toxic substances in the ethanol extracts of the Ch. globosum and Ch. cochliodes strains were chaetoglobosin, chaetoviridin A and C, chaetomugilin D and chaetomin, identified based on HPLC-UV and mass spectrometry data (MS and MS/MS). Ethanol extracts from pure Ch. globosum cultures exhibited a toxicological profile in the boar sperm motility inhibition assay (BSMI), sperm membrane integrity damage assay (SMID) and inhibition of cell proliferation (ICP) assay, similar to that exhibited by pure chaetoglobosin A. Overall, differences in fluorescence, morphology, toxicity profile, mycotoxin production and sensitivity to chemicals were consistent with those in tef1α sequencing results for species identification. The results indicate the presence of Ch. cochliodes and Ch. rectangulare in Finnish buildings, representing a new finding.

Original languageEnglish
Article number443
Number of pages22
JournalToxins
Volume12
Issue number7
DOIs
Publication statusPublished - 8 Jul 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • chaetoglobosin
  • chaetomin
  • Chaetomium cochliodes
  • Chaetomium globosum
  • Chaetomium rectangulare
  • chaetomugilin D
  • chaetoviridin A and C
  • fluorescence
  • indoor mold
  • mycotoxin

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