High diversity of microcystin chemotypes within a summer bloom of the Cyanobacterium Microcystis botrys

Emma Johansson , Catherine Legrand , Caroline Björnerås , Anna Godhe , Hanna Mazur-Marzec , Torbjörn Säll , Karin Rengefors

Abstract

The fresh-water cyanobacterium Microcystis is known to form blooms world-wide, and is often responsible for the production of microcystins found in lake water. Microcystins are nonribosomal peptides with toxic effects, e.g. on vertebrates, but their function remains largely unresolved. Moreover, not all strains produce microcystins, and many different microcystin variants have been described. Here we explored the diversity of microcystin variants within Microcystis botrys, a common bloom-former in Sweden. We isolated a total of 130 strains through the duration of a bloom in eutrophic Lake Vomb, and analyzed their microcystin profiles with tandem mass spectrometry (LC-MS/MS). We found that microcystin producing (28.5%) and non-producing (71.5%) M. botrys strains, co-existed throughout the bloom. However, microcystin producing strains were more prevalent towards the end of the sampling period. Overall, 26 unique M. botrys chemotypes were identified, and while some chemotypes re-occurred, others were found only once. The M. botrys chemotypes showed considerable variation both in terms of number of microcystin variants, as well as in what combinations the variants occurred. To our knowledge, this is the first report on microcystin chemotype variation and dynamics in M. botrys. In addition, our study verifies the co-existence of microcystin and non-microcystin producing strains, and we propose that environmental conditions may be implicated in determining their composition.
Author Emma Johansson
Emma Johansson,,
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, Catherine Legrand
Catherine Legrand,,
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, Caroline Björnerås
Caroline Björnerås,,
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, Anna Godhe
Anna Godhe,,
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, Hanna Mazur-Marzec (FOG / IO / DMarB)
Hanna Mazur-Marzec,,
- Division of Marine Biotechnology
, Torbjörn Säll
Torbjörn Säll,,
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, Karin Rengefors
Karin Rengefors,,
-
Journal seriesToxins, ISSN 2072-6651, (N/A 100 pkt)
Issue year2019
Vol11
No12
Pages1-17
Publication size in sheets0.8
Article number698
Keywords in Englishmicrocystin, Microcystis botrys, chemotypes, cyanobacteria, diversity
ASJC Classification3005 Toxicology; 2307 Health, Toxicology and Mutagenesis
DOIDOI:10.3390/toxins11120698
URL https://www.mdpi.com/2072-6651/11/12/698
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa (CC-BY); with publication
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 21-02-2020, ArticleFromJournal
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.136; WoS Impact Factor: 2018 = 3.895 (2) - 2018=4.009 (5)
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