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Novel toxic effects associated with a tropical Limnothrix/Geitlerinema ‐like cyanobacterium
Author(s) -
Bernard Catherine,
Froscio Suzanne,
Campbell Rebecca,
Monis Paul,
Humpage Andrew,
Fabbro Larelle
Publication year - 2011
Publication title -
environmental toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.813
H-Index - 77
eISSN - 1522-7278
pISSN - 1520-4081
DOI - 10.1002/tox.20552
Subject(s) - cylindrospermopsin , biology , cyanobacteria , microbiology and biotechnology , polyphyly , phylogenetic tree , botany , gene , bacteria , biochemistry , genetics , clade
The presence of a toxic strain of a fine filamentous cyanobacterium belonging to the Oscillatorialean family Pseudanabaenacea was detected during a survey of cyanobacterial taxa associated with the presence of cylindrospermopsin in dams in Central Queensland (Australia). The strain, AC0243, was isolated and cultured, its genomic DNA extracted and 16S RNA gene sequenced. Phylogenetic analysis placed AC0243 with Limnothrix species, although this genus appears polyphyletic. Moreover, not all morphological characters are consistent with this genus but more closely fit the description of Geitlerinema unigranulatum (R.N. Singh) Komárek and Azevedo. The potential toxic effects of AC0243 extract were assessed chemically and biologically. Cell free protein synthesis was inhibited by the extract. Exposure of Vero cells to the extract resulted in a significant reduction in cellular ATP levels following 24–72 h incubation. The presence of cylindrospermopsin was excluded based on the nature of responses obtained in cell and cell‐free assays; in addition, (i) it could not be detected by HPLC, LC‐MS, or immunological assay, and (ii) no genes currently associated with the production of cylindrospermopsin were found in the genome. Other known cyanobacterial toxins were not detected. The apparent novelty of this toxin is discussed. © 2009 Wiley Periodicals, Inc. Environ Toxicol 2011.