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Cai M, Zhang H, Zheng L, Tang X. A global microbiome analysis reveals the ecological feature of Tistrella and its production of the bioactive didemnins in the marine ecosystem. MARINE POLLUTION BULLETIN 2024; 207:116939. [PMID: 39243471 DOI: 10.1016/j.marpolbul.2024.116939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2024] [Revised: 09/01/2024] [Accepted: 09/02/2024] [Indexed: 09/09/2024]
Abstract
Marine microorganisms like Tistrella are essential for producing bioactive compounds, including didemnins with antitumor and antiviral properties. However, our understanding of Tistrella's ecological features and didemnin production in natural environments is limited. In this study, we used genomics and metagenomics to show that Tistrella is widely distributed across natural habitats, especially in marine environments from the surface to 5000 m deep, with distinct non-random distribution patterns revealed by co-occurrence analysis. Importantly, transcriptional profiling of didemnin biosynthetic gene clusters indicates active in situ production of this compound within marine ecosystems. These findings enhance our understanding of Tistrella's ecology and secondary metabolite production in natural environments. Further research is needed to explore the ecological dynamics and functional impacts of Tistrella in these ecosystems.
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Affiliation(s)
- Mingwei Cai
- Institute of Chemical Biology, Shenzhen Bay Laboratory, Shenzhen, China.
| | - Haili Zhang
- Institute of Chemical Biology, Shenzhen Bay Laboratory, Shenzhen, China
| | | | - Xiaoyu Tang
- Institute of Chemical Biology, Shenzhen Bay Laboratory, Shenzhen, China
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2
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Junier P, Cailleau G, Fatton M, Udriet P, Hashmi I, Bregnard D, Corona-Ramirez A, Francesco ED, Kuhn T, Mangia N, Zhioua S, Hunkeler D, Bindschedler S, Sieber S, Gonzalez D. A cohesive Microcoleus strain cluster causes benthic cyanotoxic blooms in rivers worldwide. WATER RESEARCH X 2024; 24:100252. [PMID: 39308956 PMCID: PMC11416633 DOI: 10.1016/j.wroa.2024.100252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2024] [Revised: 08/21/2024] [Accepted: 08/27/2024] [Indexed: 09/25/2024]
Abstract
Over the last two decades, proliferations of benthic cyanobacteria producing derivatives of anatoxin-a have been reported in rivers worldwide. Here, we follow up on such a toxigenic event happening in the Areuse river in Switzerland and investigate the diversity and genomics of major bloom-forming riverine benthic cyanobacteria. We show, using 16S rRNA-based community profiling, that benthic communities are dominated by Oscillatoriales. We correlate the detection of one Microcoleus sequence variant matching the Microcoleus anatoxicus species with the presence of anatoxin-a derivatives and use long-read metagenomics to assemble complete circular genomes of the strain. The main dihydro-anatoxin-a-producing strain in the Areuse is distinct from strains isolated in New Zealand, the USA, and Canada, but forms a monophyletic strain cluster with them with average nucleotide identity values close to the species threshold. Compared to the rest of the Microcoleus genus, the toxin-producing strains encode a 15 % smaller genome, lacking genes for the synthesis of some essential vitamins. Toxigenic mats harbor a distinct microbiome dominated by proteobacteria and bacteroidetes, which may support cyanobacterial growth by providing them with essential nutrients. We recommend that strains closely related to M. anatoxicus be monitored internationally in order to help predict and mitigate similar cyanotoxic events.
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Affiliation(s)
- Pilar Junier
- Laboratory of Microbiology, University of Neuchâtel, Switzerland
| | | | - Mathilda Fatton
- Laboratory of Microbiology, University of Neuchâtel, Switzerland
| | - Pauline Udriet
- Laboratory of Microbiology, University of Neuchâtel, Switzerland
| | - Isha Hashmi
- Laboratory of Microbiology, University of Neuchâtel, Switzerland
| | - Danae Bregnard
- Laboratory of Microbiology, University of Neuchâtel, Switzerland
| | | | - Eva di Francesco
- Laboratory of Microbiology, University of Neuchâtel, Switzerland
| | - Thierry Kuhn
- Laboratory of Microbiology, University of Neuchâtel, Switzerland
| | - Naïma Mangia
- Laboratory of Microbiology, University of Neuchâtel, Switzerland
| | - Sami Zhioua
- Laboratory of Microbiology, University of Neuchâtel, Switzerland
| | - Daniel Hunkeler
- Centre for Hydrogeology and Geothermics, University of Neuchâtel, Switzerland
| | | | - Simon Sieber
- Department of Chemistry, University of Zürich, Switzerland
| | - Diego Gonzalez
- Laboratory of Microbiology, University of Neuchâtel, Switzerland
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3
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Caen A, Mathias JD, Latour D. How do seasonal temperature variations influence interplay between toxic and non-toxic cyanobacterial blooms? Evidence from modeling and experimental data. HARMFUL ALGAE 2024; 134:102606. [PMID: 38705611 DOI: 10.1016/j.hal.2024.102606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 02/10/2024] [Accepted: 02/22/2024] [Indexed: 05/07/2024]
Abstract
Summer cyanobacterial blooms exhibit a dynamic interplay between toxic and non-toxic genotypes, significantly influencing the cyanotoxin levels within a lake. The challenge lies in accurately predicting these toxin concentrations due to the significant temporal fluctuations in the proportions of toxic and non-toxic genotypes. Typically, the toxic genotypes dominate during the early and late summer periods, while the non-toxic variants prevail in mid-summer. To dissect this phenomenon, we propose a model that accounts for the competitive interaction between toxic and non-toxic genotypes, as well as seasonal temperature variations. Our numerical simulations suggest that the optimal temperature of the toxic genotypes is lower than that of the optimal temperatures of the non-toxic counterparts. This difference of optimal temperature may potentially contribute to explain the dominance of toxic genotypes at the early and late summer periods, situation often observed in the field. Experimental data from the laboratory align qualitatively with our simulation results, enabling a better understanding of complex interplays between toxic and non-toxic cyanobacteria.
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Affiliation(s)
- Auguste Caen
- INRAE, UR MaIAGE, Domaine de Vilvert, JOUY-EN-JOSAS, 78352, France.
| | - Jean-Denis Mathias
- Université Clermont Auvergne, INRAE, UR LISC, 9 avenue Blaise Pascal - CS 20085, Aubiére, 63178, France.
| | - Delphine Latour
- Université Clermont Auvergne, LMGE, 1, Impasse Amélie Murat, Aubiére, 63178, France.
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4
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Johnston LH, Huang Y, Bermarija TD, Rafuse C, Zamlynny L, Bruce MR, Graham C, Comeau AM, Valadez-Cano C, Lawrence JE, Beach DG, Jamieson RC. Proliferation and anatoxin production of benthic cyanobacteria associated with canine mortalities along a stream-lake continuum. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 917:170476. [PMID: 38290679 DOI: 10.1016/j.scitotenv.2024.170476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 01/24/2024] [Accepted: 01/24/2024] [Indexed: 02/01/2024]
Abstract
Proliferations of benthic cyanobacteria are increasingly in the public eye, with rising animal deaths associated with benthic rather than planktonic blooms. In early June 2021, two dogs died after consuming material on the shore of Shubenacadie Grand Lake, Nova Scotia. Preliminary investigations indicated anatoxins produced by benthic cyanobacterial mats were responsible for the deaths. In this study, we monitored the growth of a toxic benthic cyanobacterial species (Microcoleus sp.) along a stream-lake continuum where the canine poisonings occurred. We found that the species was able to proliferate in both lentic and lotic environments, but temporal growth dynamics and the predominant sub-species were influenced by habitat type, and differed with hydrodynamic setting, nutrient and sunlight availability. Toxin concentration was greatest in cyanobacterial mats growing in the oligotrophic lakeshore environment (maximum measured total anatoxins (ATXs) >20 mg·kg-1 wet weight). This corresponded with a shift in the profile of ATX analogues, which also indicated changing sub-species dominance along the stream-lake transition.
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Affiliation(s)
- Lindsay H Johnston
- Centre for Water Resources Studies, Department of Civil & Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada
| | - Yannan Huang
- Centre for Water Resources Studies, Department of Civil & Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada
| | - Tessa D Bermarija
- Centre for Water Resources Studies, Department of Civil & Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada
| | - Cheryl Rafuse
- Biotoxin Metrology, National Research Council Canada, 1411 Oxford St, Halifax, NS, Canada
| | - Lydia Zamlynny
- Biotoxin Metrology, National Research Council Canada, 1411 Oxford St, Halifax, NS, Canada
| | - Meghann R Bruce
- Canadian Rivers Institute, Department of Biology, University of New Brunswick, P.O. Box 4400, Fredericton, NB, Canada
| | - Catherine Graham
- Nova Scotia Department of Agriculture, Animal Health Laboratory, 65 River Rd, Bible Hill, NS, Canada
| | - André M Comeau
- Integrated Microbiome Resource (IMR), Dalhousie University, Halifax, Canada
| | - Cecilio Valadez-Cano
- Biology Department, University of New Brunswick, Fredericton, New Brunswick, Canada
| | - Janice E Lawrence
- Biology Department, University of New Brunswick, Fredericton, New Brunswick, Canada
| | - Daniel G Beach
- Centre for Water Resources Studies, Department of Civil & Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada; Biotoxin Metrology, National Research Council Canada, 1411 Oxford St, Halifax, NS, Canada
| | - Rob C Jamieson
- Centre for Water Resources Studies, Department of Civil & Resource Engineering, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada.
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Valadez-Cano C, Reyes-Prieto A, Lawrence J. Novel virulent and temperate cyanophages predicted to infect Microcoleus associated with anatoxin-producing benthic mats. Environ Microbiol 2023; 25:3319-3332. [PMID: 37849433 DOI: 10.1111/1462-2920.16527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 10/03/2023] [Indexed: 10/19/2023]
Abstract
Cyanophages are crucial for regulating cyanobacterial populations, but their influence on anatoxin-producing Microcoleus mat dynamics remains unexplored. Here, we use metagenomics to explore phage presence in benthic mats from the Wolastoq|Saint John River (New Brunswick, Canada) and the Eel River (California, USA). We recovered multiple viral-like sequences associated with different putative bacterial hosts, including two cyanophage genomes with apparently different replication strategies. A temperate cyanophage was found integrated in the genomes of Microcoleus sp. 3 recovered from the Eel River and is phylogenetically related to Phormidium phages. We also recovered novel virulent cyanophage genomes from Wolastoq and Eel River mats that were dominated by anatoxin-producing Microcoleus species predicted to be the host. Despite the geographical distance, these genomes have similar sizes (circa 239 kbp) and share numerous orthologous genes with high sequence identity. A considerable reduction of the anatoxin-producing Microcoleus species in Wolastoq mats following the emergence of the virulent phage suggests that phage infections have an important role in limiting the abundance of this toxigenic cyanobacterium and releasing anatoxins into the surrounding water. Our results constitute the first report of cyanophages predicted to infect mat-forming Microcoleus species associated with anatoxin production.
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Affiliation(s)
- Cecilio Valadez-Cano
- Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada
| | - Adrian Reyes-Prieto
- Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada
| | - Janice Lawrence
- Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada
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Laux M, Piroupo CM, Setubal JC, Giani A. The Raphidiopsis (= Cylindrospermopsis) raciborskii pangenome updated: Two new metagenome-assembled genomes from the South American clade. HARMFUL ALGAE 2023; 129:102518. [PMID: 37951618 DOI: 10.1016/j.hal.2023.102518] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 09/15/2023] [Accepted: 09/28/2023] [Indexed: 11/14/2023]
Abstract
Two Raphidiopsis (=Cylindrospermopsis) raciborskii metagenome-assembled genomes (MAGs) were recovered from two freshwater metagenomic datasets sampled in 2011 and 2012 in Pampulha Lake, a hypereutrophic, artificial, shallow reservoir, located in the city of Belo Horizonte (MG), Brazil. Since the late 1970s, the lake has undergone increasing eutrophication pressure, due to wastewater input, leading to the occurrence of frequent cyanobacterial blooms. The major difference observed between PAMP2011 and PAMP2012 MAGs was the lack of the saxitoxin gene cluster in PAMP2012, which also presented a smaller genome, while PAMP2011 presented the complete sxt cluster and all essential proteins and clusters. The pangenome analysis was performed with all Raphidiopsis/Cylindrospermopsis genomes available at NCBI to date, with the addition of PAMP2011 and PAMP2012 MAGs (All33 subset), but also without the South American strains (noSA subset), and only among the South American strains (SA10 and SA8 subsets). We observed a substantial increase in the core genome size for the 'noSA' subset, in comparison to 'All33' subset, and since the core genome reflects the closeness among the pangenome members, the results strongly suggest that the conservation level of the essential gene repertoire seems to be affected by the geographic origin of the strains being analyzed, supporting the existence of a distinct SA clade. The Raphidiopsis pangenome comprised a total of 7943 orthologous protein clusters, and the two new MAGs increased the pangenome size by 11%. The pangenome based phylogenetic relationships among the 33 analyzed genomes showed that the SA genomes clustered together with 99% bootstrap support, reinforcing the metabolic particularity of the Raphidiopsis South American clade, related to its saxitoxin producing unique ability, while also indicating a different evolutionary history due to its geographic isolation.
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Affiliation(s)
- Marcele Laux
- Department of Botany, Phycology Laboratory, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil
| | - Carlos Morais Piroupo
- Department of Biochemistry, Institute of Chemistry, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil
| | - João Carlos Setubal
- Department of Biochemistry, Institute of Chemistry, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil
| | - Alessandra Giani
- Department of Botany, Phycology Laboratory, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil.
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Valadez-Cano C, Reyes-Prieto A, Beach DG, Rafuse C, McCarron P, Lawrence J. Genomic characterization of coexisting anatoxin-producing and non-toxigenic Microcoleus subspecies in benthic mats from the Wolastoq, New Brunswick, Canada. HARMFUL ALGAE 2023; 124:102405. [PMID: 37164558 DOI: 10.1016/j.hal.2023.102405] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 02/13/2023] [Accepted: 02/14/2023] [Indexed: 05/12/2023]
Abstract
The presence of toxigenic benthic cyanobacteria in riverine ecosystems is an increasing concern around the world. In 2018, the death of three dogs along the Wolastoq (also known as the Saint John River) in New Brunswick, Canada, was attributed to anatoxin exposure after they ingested benthic microbial mats found along the shore. Here, we shotgun sequenced the DNA of 15 non-axenic cyanobacterial isolates derived from four anatoxin-containing benthic mat samples associated with the dog deaths. Anatoxins were produced by some of the isolates, but not all. We retrieved near-complete Microcoleus metagenome-assembled genomes (MAGs) from the isolates that are closely related to anatoxin-producing Microcoleus from the Cardrona River (New Zealand), although the Microcoleus MAGs from the Wolastoq varied in the presence/absence of the anatoxin-a biosynthesis cluster. Sequence similarity at the genomic level suggests that toxigenic and non-toxigenic Microcoleus MAGs from the Wolastoq belong to the same species but are separate subspecies. The toxigenic and nontoxic Wolastoq Microcoleus subspecies coexisted in the mat samples in similar relative abundance. Overall genomic comparisons revealed that toxigenic Microcoleus MAGs are longer and code for more accessory genes than their non-toxigenic relatives, suggesting a differential responsiveness to changing environments, stress conditions and nutrient availability.
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Affiliation(s)
- Cecilio Valadez-Cano
- Department of Biology, University of New Brunswick, 10 Bailey Drive, Fredericton, New Brunswick, E3B 5A3, Canada
| | - Adrian Reyes-Prieto
- Department of Biology, University of New Brunswick, 10 Bailey Drive, Fredericton, New Brunswick, E3B 5A3, Canada
| | - Daniel G Beach
- Biotoxin Metrology, National Research Council Canada, 1411 Oxford Street, Halifax, Nova Scotia, B3H 3Z1, Canada
| | - Cheryl Rafuse
- Biotoxin Metrology, National Research Council Canada, 1411 Oxford Street, Halifax, Nova Scotia, B3H 3Z1, Canada
| | - Pearse McCarron
- Biotoxin Metrology, National Research Council Canada, 1411 Oxford Street, Halifax, Nova Scotia, B3H 3Z1, Canada
| | - Janice Lawrence
- Department of Biology, University of New Brunswick, 10 Bailey Drive, Fredericton, New Brunswick, E3B 5A3, Canada.
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Cissell EC, Eckrich CE, McCoy SJ. Cyanobacterial mats as benthic reservoirs and vectors for coral black band disease pathogens. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2022; 32:e2692. [PMID: 35707998 DOI: 10.1002/eap.2692] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 05/26/2022] [Accepted: 06/03/2022] [Indexed: 06/15/2023]
Abstract
The concurrent rise in the prevalence of conspicuous benthic cyanobacterial mats and the incidence of coral diseases independently mark major axes of degradation of coral reefs globally. Recent advances have uncovered the potential for the existence of interactions between the expanding cover of cyanobacterial mats and coral disease, especially black band disease (BBD), and this intersection represents both an urgent conservation concern and a critical challenge for future research. Here, we propose links between the transmission of BBD and benthic cyanobacterial mats. We provide molecular and ecophysiological evidence suggesting that cyanobacterial mats may create and maintain physically favorable benthic refugia for BBD pathogens while directly harboring BBD precursor assemblages, and discuss how mats may serve as direct (mediated via contact) and indirect (mediated via predator-prey-pathogen relationships) vectors for BBD pathogens. Finally, we identify and outline future priority research directions that are aligned with actionable management practices and priorities to support evidence-based coral conservation practices.
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Affiliation(s)
- Ethan C Cissell
- Department of Biological Science, Florida State University, Tallahassee, Florida, USA
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Caren E Eckrich
- Stichting Nationale Parken (STINAPA) Bonaire, Kralendijk, Bonaire, Caribbean Netherlands
| | - Sophie J McCoy
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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