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Ruggiero MV, Buffoli M, Wolf KKE, D'Alelio D, Di Tuccio V, Lombardi E, Manfellotto F, Vitale L, Margiotta F, Sarno D, John U, Ferrante MI, Montresor M. Multiannual patterns of genetic structure and mating type ratios highlight the complex bloom dynamics of a marine planktonic diatom. Sci Rep 2024; 14:6028. [PMID: 38472358 DOI: 10.1038/s41598-024-56292-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Accepted: 03/05/2024] [Indexed: 03/14/2024] Open
Abstract
Understanding the genetic structure of populations and the processes responsible for its spatial and temporal dynamics is vital for assessing species' adaptability and survival in changing environments. We investigate the genetic fingerprinting of blooming populations of the marine diatom Pseudo-nitzschia multistriata in the Gulf of Naples (Mediterranean Sea) from 2008 to 2020. Strains were genotyped using microsatellite fingerprinting and natural samples were also analysed with Microsatellite Pool-seq Barcoding based on Illumina sequencing of microsatellite loci. Both approaches revealed a clonal expansion event in 2013 and a more stable genetic structure during 2017-2020 compared to previous years. The identification of a mating type (MT) determination gene allowed to assign MT to strains isolated over the years. MTs were generally at equilibrium with two notable exceptions, including the clonal bloom of 2013. The populations exhibited linkage equilibrium in most blooms, indicating that sexual reproduction leads to genetic homogenization. Our findings show that P. multistriata blooms exhibit a dynamic genetic and demographic composition over time, most probably determined by deeper-layer cell inocula. Occasional clonal expansions and MT imbalances can potentially affect the persistence and ecological success of planktonic diatoms.
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Affiliation(s)
| | - Marina Buffoli
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Klara K E Wolf
- Institut für Marine Ökosystem- und Fischereiwissenschaften, Universität Hamburg, Hamburg, Germany
- Limnological Institute, Environmental Genomics, University of Konstanz, Konstanz, Germany
| | - Domenico D'Alelio
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Viviana Di Tuccio
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Ernestina Lombardi
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Francesco Manfellotto
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Laura Vitale
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Francesca Margiotta
- Department of Research Infrastructures for Marine Biological Resources, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Diana Sarno
- Department of Research Infrastructures for Marine Biological Resources, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Uwe John
- Alfred-Wegener-Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
- Helmholtz Institute for Functional Marine Biodiversity, Oldenburg, Germany
| | - Maria Immacolata Ferrante
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
- Oceanography Section, National Institute of Oceanography and Applied Geophysics, Trieste, Italy
| | - Marina Montresor
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy.
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Accoroni S, Cangini M, Angeletti R, Losasso C, Bacchiocchi S, Costa A, Taranto AD, Escalera L, Fedrizzi G, Garzia A, Longo F, Macaluso A, Melchiorre N, Milandri A, Milandri S, Montresor M, Neri F, Piersanti A, Rubini S, Suraci C, Susini F, Vadrucci MR, Mudadu AG, Vivaldi B, Soro B, Totti C, Zingone A. Marine phycotoxin levels in shellfish-14 years of data gathered along the Italian coast. Harmful Algae 2024; 131:102560. [PMID: 38212084 DOI: 10.1016/j.hal.2023.102560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 11/27/2023] [Accepted: 12/06/2023] [Indexed: 01/13/2024]
Abstract
Along the Italian coasts, toxins of algal origin in wild and cultivated shellfish have been reported since the 1970s. In this study, we used data gathered by the Veterinary Public Health Institutes (IZS) and the Italian Environmental Health Protection Agencies (ARPA) from 2006 to 2019 to investigate toxicity events along the Italian coasts and relate them to the distribution of potentially toxic species. Among the detected toxins (OA and analogs, YTXs, PTXs, STXs, DAs, AZAs), OA and YTX were those most frequently reported. Levels exceeding regulatory limits in the case of OA (≤2,448 μg equivalent kg-1) were associated with high abundances of Dinophysis spp., and in the case of YTXs (≤22 mg equivalent kg-1) with blooms of Gonyaulax spinifera, Lingulodinium polyedra, and Protoceratium reticulatum. Seasonal blooms of Pseudo-nitzschia spp. occur all along the Italian coast, but DA has only occasionally been detected in shellfish at concentrations always below the regulatory limit (≤18 mg kg-1). Alexandrium spp. were recorded in several areas, although STXs (≤13,782 µg equivalent kg-1) rarely and only in few sites exceeded the regulatory limit in shellfish. Azadinium spp. have been sporadically recorded, and AZAs have been sometimes detected but always in low concentrations (≤7 µg equivalent kg-1). Among the emerging toxins, PLTX-like toxins (≤971 μg kg-1 OVTX-a) have often been detected mainly in wild mussels and sea urchins from rocky shores due to the presence of Ostreopsis cf. ovata. Overall, Italian coastal waters harbour a high number of potentially toxic species, with a few HAB hotspots mainly related to DSP toxins. Nevertheless, rare cases of intoxications have occurred so far, reflecting the whole Mediterranean Sea conditions.
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Affiliation(s)
| | - Monica Cangini
- National Reference Laboratory for Marine Biotoxins, CRM, Cesenatico, FC, Italy
| | | | | | | | | | | | | | | | - Angela Garzia
- DiSVA, Università Politecnica delle Marche, Ancona, Italy
| | | | | | | | - Anna Milandri
- National Reference Laboratory for Marine Biotoxins, CRM, Cesenatico, FC, Italy
| | - Stefania Milandri
- National Reference Laboratory for Marine Biotoxins, CRM, Cesenatico, FC, Italy
| | | | - Francesca Neri
- DiSVA, Università Politecnica delle Marche, Ancona, Italy
| | | | - Silva Rubini
- IZS della Lombardia e dell'Emilia-Romagna, Ferrara, Italy
| | | | | | | | | | | | | | - Cecilia Totti
- DiSVA, Università Politecnica delle Marche, Ancona, Italy
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von Dassow P, Mikhno M, Percopo I, Orellana VR, Aguilera V, Álvarez G, Araya M, Cornejo-Guzmán S, Llona T, Mardones JI, Norambuena L, Salas-Rojas V, Kooistra WHCF, Montresor M, Sarno D. Diversity and toxicity of the planktonic diatom genus Pseudo-nitzschia from coastal and offshore waters of the Southeast Pacific, including Pseudo-nitzschia dampieri sp. nov. Harmful Algae 2023; 130:102520. [PMID: 38061816 DOI: 10.1016/j.hal.2023.102520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 09/18/2023] [Accepted: 09/29/2023] [Indexed: 12/18/2023]
Abstract
To expand knowledge of Pseudo-nitzschia species in the Southeast Pacific, we isolated specimens from coastal waters of central Chile (36°S-30°S), the Gulf of Corcovado, and the oceanic Robinson Crusoe Island (700 km offshore) and grew them into monoclonal strains. A total of 123 Pseudo-nitzschia strains were identified to 11 species based on sequencing of the ITS region of the nuclear rDNA and on ultrastructural and morphometric analyses of the frustule in selected representatives of each clade: P. australis, P. bucculenta, P. cf. chiniana, P. cf. decipiens, P. fraudulenta, P. hasleana, P. multistriata, P. plurisecta, P. cf. sabit, the new species P. dampieri sp. nov., and one undescribed species. Partial 18S and 28S rDNA sequences, including the hypervariable V4 and D1-D3 regions used for barcoding, were gathered from representative strains of each species to facilitate future metabarcoding studies. Results showed different levels of genetic, and at times ultrastructural, diversity among the above-mentioned entities, suggesting morphological variants (P. bucculenta), rapidly radiating complexes with ill-defined species boundaries (P. cf. decipiens and P. cf. sabit), and the presence of new species (P. dampieri sp. nov., Pseudo-nitzschia sp. 1, and probably P. cf. chiniana). Domoic acid (DA) was detected in 18 out of 82 strains tested, including those of P. australis, P. plurisecta, and P. multistriata. Toxicity varied among species mostly corresponding to expectations from previous reports, with the prominent exception of P. fraudulenta; DA was not detected in any of its 10 strains tested. In conclusion, a high diversity of Pseudo-nitzschia exists in Chilean waters, particularly offshore.
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Affiliation(s)
- Peter von Dassow
- Departamento de Ecología, Facultad de Ciencias Biologicas, Pontificia Universidad Catolica de Chile, Avenida Libertador Bernardo O'Higgins 340, Santiago, 8331150, Chile; Instituto Milenio de Oceanografía, Universidad de Concepción, Barrio Universitario S/N, Concepción, 4070112, Chile; Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy.
| | - Marta Mikhno
- Departamento de Ecología, Facultad de Ciencias Biologicas, Pontificia Universidad Catolica de Chile, Avenida Libertador Bernardo O'Higgins 340, Santiago, 8331150, Chile; Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | - Isabella Percopo
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | - Valentina Rubio Orellana
- Departamento de Ecología, Facultad de Ciencias Biologicas, Pontificia Universidad Catolica de Chile, Avenida Libertador Bernardo O'Higgins 340, Santiago, 8331150, Chile; Instituto Milenio de Oceanografía, Universidad de Concepción, Barrio Universitario S/N, Concepción, 4070112, Chile
| | - Víctor Aguilera
- Instituto Milenio de Oceanografía, Universidad de Concepción, Barrio Universitario S/N, Concepción, 4070112, Chile; Laboratorio de Oceanografía Desértico Costera (LODEC), Centro de Estudios Avanzados en Zonas Áridas, Larrondo 1281, Coquimbo, 1781421, Chile
| | - Gonzalo Álvarez
- Facultad de Ciencias del Mar, Departamento de Acuicultura, Universidad Católica del Norte, Larrondo 1281, Coquimbo, 1781421, Chile; Centro de Investigación y Desarrollo Tecnológico en Algas (CIDTA), Universidad Católica del Norte, Larrondo 1281, Coquimbo, 1781421, Chile
| | - Michael Araya
- Centro de Investigación y Desarrollo Tecnológico en Algas (CIDTA), Universidad Católica del Norte, Larrondo 1281, Coquimbo, 1781421, Chile
| | - Sebastián Cornejo-Guzmán
- Departamento de Geofísica, Universidad de Concepción, Barrio Universitario S/N, Concepción, 4070112 Chile
| | - Tomás Llona
- Instituto Milenio de Oceanografía, Universidad de Concepción, Barrio Universitario S/N, Concepción, 4070112, Chile
| | - Jorge I Mardones
- Centro de Estudio de Algas Nocivas (CREAN), Instituto de Fomento Pesquero, Padre Harter 574, Puerto Montt, 5501679, Chile; Centro de Investigación en Recursos Naturales y Sustentabilidad (CIRENYS), Universidad Bernardo O´Higgins, Santiago 8370993, Chile
| | - Luis Norambuena
- Centro de Estudio de Algas Nocivas (CREAN), Instituto de Fomento Pesquero, Padre Harter 574, Puerto Montt, 5501679, Chile
| | - Victoria Salas-Rojas
- Departamento de Ecología, Facultad de Ciencias Biologicas, Pontificia Universidad Catolica de Chile, Avenida Libertador Bernardo O'Higgins 340, Santiago, 8331150, Chile; Instituto Milenio de Oceanografía, Universidad de Concepción, Barrio Universitario S/N, Concepción, 4070112, Chile
| | | | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | - Diana Sarno
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
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Ferrante MI, Broccoli A, Montresor M. The pennate diatom Pseudo-nitzschia multistriata as a model for diatom life cycles, from the laboratory to the sea. J Phycol 2023; 59:637-643. [PMID: 37256710 DOI: 10.1111/jpy.13342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 05/03/2023] [Accepted: 05/04/2023] [Indexed: 06/02/2023]
Abstract
Phytoplankton dynamics are regulated by external cues, such as light and nutrients, as well as by biotic interactions and endogenous controls linked to life cycle characteristics. The planktonic pennate diatom Pseudo-nitzschia multistriata, with a heterothallic mating system with two opposite mating types (MTs), represents a model for the study of diatom life cycles. P. multistriata is a toxic species, able to produce the neurotoxin domoic acid. First described in Japan in 1993, it was detected at the long-term monitoring station MareChiara (Gulf of Naples, Italy) in 1995. Since then, P. multistriata has been reported from several worldwide coastal sites. A large body of knowledge has been produced on its ecology, genetic diversity, and life cycle characteristics. The availability of these data, the ecological relevance of the Pseudo-nitzschia genus, and its controllable life cycle with a short generation time made it an ideal species to develop a genetic model system for diatoms. To enable functional studies, a 59 Mb genome sequence and several transcriptomic data were produced, and genetic transformation was optimized. These tools allowed the discovery of the first mating-type determining gene for diatoms. Gene expression studies and metabolomics analyses defined genes and molecules underpinning different phases of the process of sexual reproduction. This model system, developed to explore the genetics of diatom life cycles, offers the opportunity to parallel experimental observations in the laboratory using in situ meta-omics analyses along space and time, empowering knowledge on the biology and ecology of the genus.
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Affiliation(s)
- Maria Immacolata Ferrante
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
- National Institute of Oceanography and Applied Geophysics, Trieste, Italy
| | - Andrea Broccoli
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Marina Montresor
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
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Barrenechea Angeles I, Romero-Martínez ML, Cavaliere M, Varrella S, Francescangeli F, Piredda R, Mazzocchi MG, Montresor M, Schirone A, Delbono I, Margiotta F, Corinaldesi C, Chiavarini S, Montereali MR, Rimauro J, Parrella L, Musco L, Dell'Anno A, Tangherlini M, Pawlowski J, Frontalini F. Encapsulated in sediments: eDNA deciphers the ecosystem history of one of the most polluted European marine sites. Environ Int 2023; 172:107738. [PMID: 36641836 DOI: 10.1016/j.envint.2023.107738] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 12/05/2022] [Accepted: 01/04/2023] [Indexed: 06/17/2023]
Abstract
The Anthropocene is characterized by dramatic ecosystem changes driven by human activities. The impact of these activities can be assessed by different geochemical and paleontological proxies. However, each of these proxies provides only a fragmentary insight into the effects of anthropogenic impacts. It is highly challenging to reconstruct, with a holistic view, the state of the ecosystems from the preindustrial period to the present day, covering all biological components, from prokaryotes to multicellular eukaryotes. Here, we used sedimentary ancient DNA (sedaDNA) archives encompassing all trophic levels of biodiversity to reconstruct the two century-natural history in Bagnoli-Coroglio (Gulf of Pozzuoli, Tyrrhenian Sea), one of the most polluted marine-coastal sites in Europe. The site was characterized by seagrass meadows and high eukaryotic diversity until the beginning of the 20th century. Then, the ecosystem completely changed, with seagrasses and associated fauna as well as diverse groups of planktonic and benthic protists being replaced by low diversity biota dominated by dinophyceans and infaunal metazoan species. The sedaDNA analysis revealed a five-phase evolution of the area, where changes appear as the result of a multi-level cascade effect of impacts associated with industrial activities, urbanization, water circulation and land-use changes. The sedaDNA allowed to infer reference conditions that must be considered when restoration actions are to be implemented.
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Affiliation(s)
- Ines Barrenechea Angeles
- Department of Earth Sciences, University of Geneva, 13, rue des Maraîchers, 1205 Geneva, Switzerland; Department of Genetics and Evolution, University of Geneva, 1205 Geneva, Switzerland.
| | | | - Marco Cavaliere
- Department of Pure and Applied Sciences, Università of Urbino "Carlo Bo", 61029 Urbino, Italy.
| | - Stefano Varrella
- Department of Materials, Environmental Sciences and Urban Planning, Polytechnic University of Marche, 60131 Ancona, Italy.
| | | | - Roberta Piredda
- Department of Veterinary Medicine, University of Bari Aldo Moro, 70010 Bari, Italy.
| | | | | | - Antonio Schirone
- ENEA, Department of Sustainability, Marine Environment Research Centre S. Teresa, 19032 Pozzuolo di Lerici, Italy.
| | - Ivana Delbono
- ENEA, Department of Sustainability, Marine Environment Research Centre S. Teresa, 19032 Pozzuolo di Lerici, Italy.
| | | | - Cinzia Corinaldesi
- Department of Materials, Environmental Sciences and Urban Planning, Polytechnic University of Marche, 60131 Ancona, Italy.
| | | | | | - Juri Rimauro
- ENEA, Department of Sustainability, CR Portici, 80055, Portici, Naples, Italy.
| | - Luisa Parrella
- ENEA, Department of Sustainability, CR Portici, 80055, Portici, Naples, Italy.
| | - Luigi Musco
- Stazione Zoologica Anton Dohrn, 80121 Naples, Italy; Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, University of Salento, 73100 Lecce, Italy.
| | - Antonio Dell'Anno
- Department of Life and Environmental Sciences, Polytechnic University of Marche, 60131 Ancona, Italy.
| | | | - Jan Pawlowski
- Department of Genetics and Evolution, University of Geneva, 1205 Geneva, Switzerland; ID-Gene ecodiagnostics Ltd, 1228 Plan-les-Ouates, Switzerland; Institute of Oceanology, Polish Academy of Sciences, 81-712 Sopot, Poland.
| | - Fabrizio Frontalini
- Department of Pure and Applied Sciences, Università of Urbino "Carlo Bo", 61029 Urbino, Italy.
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Annunziata R, Mele BH, Marotta P, Volpe M, Entrambasaguas L, Mager S, Stec K, d’Alcalà MR, Sanges R, Finazzi G, Iudicone D, Montresor M, Ferrante MI. Trade-off between sex and growth in diatoms: Molecular mechanisms and demographic implications. Sci Adv 2022; 8:eabj9466. [PMID: 35044817 PMCID: PMC8769554 DOI: 10.1126/sciadv.abj9466] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Diatoms are fast-growing and winning competitors in aquatic environments, possibly due to optimized growth performance. However, their life cycles are complex, heteromorphic, and not fully understood. Here, we report on the fine control of cell growth and physiology during the sexual phase of the marine diatom Pseudo-nitzschia multistriata. We found that mating, under nutrient replete conditions, induces a prolonged growth arrest in parental cells. Transcriptomic analyses revealed down-regulation of genes related to major metabolic functions from the early phases of mating. Single-cell photophysiology also pinpointed an inhibition of photosynthesis and storage lipids accumulated in the arrested population, especially in gametes and zygotes. Numerical simulations revealed that growth arrest affects the balance between parental cells and their siblings, possibly favoring the new generation. Thus, in addition to resources availability, life cycle traits contribute to shaping the species ecological niches and must be considered to describe and understand the structure of plankton communities.
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Affiliation(s)
- Rossella Annunziata
- Stazione Zoologica Anton Dohrn, Napoli, Italy
- Corresponding author. (R.A.); (M.I.F.)
| | | | | | | | | | | | | | | | - Remo Sanges
- International School for Advanced Studies (SISSA), Via Bonomea 265, Trieste 34136, Italy
| | - Giovanni Finazzi
- Université Grenoble Alpes (UGA), Centre National Recherche Scientifique (CNRS), Commissariat Energie Atomique, Energies Alternatives (CEA), Institut National Recherche Agriculture, Alimentation, Environnement (INRAE), Interdisciplinary Research Institute of Grenoble, IRIG-Laboratoire de Physiologie Cellulaire et Végétale, Grenoble, France
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Simbolo M, Bersani S, Vicentini C, Taormina SV, Ciaparrone C, Bagante F, Rusev B, Centonze G, Montresor M, Brunelli M, Pedron S, Mafficini A, Paolino G, Mattiolo P, Conci S, Milione M, Guglielmi A, Ruzzenente A, Scarpa A, Luchini C. Molecular characterization of extrahepatic cholangiocarcinoma: perihilar and distal tumors display divergent genomic and transcriptomic profiles. Expert Opin Ther Targets 2021; 25:1095-1105. [PMID: 34873971 DOI: 10.1080/14728222.2021.2013801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND Extrahepatic cholangiocarcinoma (ECC) is classified into two subtypes based on anatomic origin: distal extrahepatic (DECC) and perihilar (PHCC) cholangiocarcinoma. This study aimed to shed light on its genomic and transcriptomic profiles. RESEARCH DESIGN AND METHODS The genomic alterations of 99 ECC (47 PHCC and 52 DECC) were investigated by next-generation sequencing of 96 genes. A subgroup of cases, representative of each subtype, was further investigated using transcriptomic analysis. Bioinformatics tools were applied for clustering and pathway analysis and defining the immune composition of the tumor microenvironment. RESULTS PHCC had more frequent KRAS mutations (p = 0.0047), whereas TP53 mutations were more common in DECC (p = 0.006). Potentially actionable alterations included high-tumor mutational burden and/or microsatellite instability (7.1%), PI3KCA mutations (8.1%), and MYC (10.1%) and ERBB2 amplification (5.1%). The transcriptomic profiles showed the presence of three distinct clusters, which followed the anatomic origin and differed in immune microenvironment. DECC appeared to contain two distinct tumor subgroups, one enriched for druggable alterations and one lacking actionable opportunities. CONCLUSIONS This study provides new insights into the molecular landscape and the actionable alterations of ECC. Our findings represent a step toward improved ECC molecular taxonomy and therapeutic strategies for precision oncology.
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Affiliation(s)
- Michele Simbolo
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Samantha Bersani
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Caterina Vicentini
- ARC-Net Research Center, University and Hospital Trust of Verona, Verona, Italy
| | - Sergio V Taormina
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Chiara Ciaparrone
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Fabio Bagante
- Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, Unit of General and Hepatobiliary Surgery, University and Hospital Trust of Verona, Verona, Italy
| | - Borislav Rusev
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy.,ARC-Net Research Center, University and Hospital Trust of Verona, Verona, Italy
| | - Giovanni Centonze
- Pathology Unit, Foundation IRCCS, Istituto Nazionale Tumori, Milano, Italy
| | - Marina Montresor
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Matteo Brunelli
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Serena Pedron
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Andrea Mafficini
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy.,ARC-Net Research Center, University and Hospital Trust of Verona, Verona, Italy
| | - Gaetano Paolino
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Paola Mattiolo
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy
| | - Simone Conci
- Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, Unit of General and Hepatobiliary Surgery, University and Hospital Trust of Verona, Verona, Italy
| | - Massimo Milione
- Pathology Unit, Foundation IRCCS, Istituto Nazionale Tumori, Milano, Italy
| | - Alfredo Guglielmi
- Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, Unit of General and Hepatobiliary Surgery, University and Hospital Trust of Verona, Verona, Italy
| | - Andrea Ruzzenente
- Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, Unit of General and Hepatobiliary Surgery, University and Hospital Trust of Verona, Verona, Italy
| | - Aldo Scarpa
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy.,ARC-Net Research Center, University and Hospital Trust of Verona, Verona, Italy
| | - Claudio Luchini
- Department of Diagnostics and Public Health, Section of Pathology, University and Hospital Trust of Verona, Verona, Italy.,ARC-Net Research Center, University and Hospital Trust of Verona, Verona, Italy
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8
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Cavaliere M, Barrenechea Angeles I, Montresor M, Bucci C, Brocani L, Balassi E, Margiotta F, Francescangeli F, Bouchet VMP, Pawlowski J, Frontalini F. Assessing the ecological quality status of the highly polluted Bagnoli area (Tyrrhenian Sea, Italy) using foraminiferal eDNA metabarcoding. Sci Total Environ 2021; 790:147871. [PMID: 34098278 DOI: 10.1016/j.scitotenv.2021.147871] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 05/14/2021] [Accepted: 05/14/2021] [Indexed: 06/12/2023]
Abstract
Morphology-based benthic foraminifera indices are increasingly used worldwide for biomonitoring the ecological quality of marine sediments. The recent development of foraminiferal eDNA metabarcoding offers a reliable, time-, and cost-effective alternative to morphology-based foraminiferal biomonitoring. However, the practical applications of these new tools are still highly limited. In the present study, we evaluate the response of benthic foraminifera and define the ecological quality status (EcoQS) in the Bagnoli area (Tyrrhenian Sea, Italy) based on a traditional morphology-based approach and eDNA metabarcoding. The geochemical data show that several sites in front of the former industrial plant contain higher concentrations of potentially toxic elements than the effect range median and are characterized by the highest total organic carbon (TOC) content, whereas the distantly located sites can be considered relatively low- to unpolluted. Significant differences (i.e., diversity and assemblage composition) in both morphological and molecular datasets were found between the relatively low- to unpolluted and the most polluted areas. Similarly, the selected ecological indices of both morphological and molecular datasets strikingly and congruently resulted in a clear separation following the environmental stress gradient. The molecular indices (i.e., g-exp(H'bc), g-Foram AMBI, and g-Foram AMBI-MOTUs) reliably identified poor-to-bad EcoQS in the polluted area in front of the former industrial plant. On the other hand, the Foram-AMBI based on morphology well identified an overall trend but seemed to overestimate the EcoQS if the traditional class boundaries were considered. The congruent and complementary trends between morphological and metabarcoding data observed in the case of the Bagnoli site further support the application of foraminiferal metabarcoding in routine biomonitoring to assess the environmental impacts of heavily polluted marine areas.
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Affiliation(s)
- M Cavaliere
- Dipartimento di Scienze Pure e Applicate, Università degli Studi di Urbino "Carlo Bo", 61029 Urbino, Italy.
| | - I Barrenechea Angeles
- Department of Genetics and Evolution, University of Geneva, 1205 Geneva, Switzerland; Department of Earth Sciences, University of Geneva, 1205 Geneva, Switzerland
| | - M Montresor
- Stazione Zoologica Anton Dohrn, 80122 Naples, Italy
| | - C Bucci
- Dipartimento di Scienze Pure e Applicate, Università degli Studi di Urbino "Carlo Bo", 61029 Urbino, Italy
| | - L Brocani
- Dipartimento di Scienze Pure e Applicate, Università degli Studi di Urbino "Carlo Bo", 61029 Urbino, Italy
| | - E Balassi
- Dipartimento di Scienze Pure e Applicate, Università degli Studi di Urbino "Carlo Bo", 61029 Urbino, Italy
| | - F Margiotta
- Stazione Zoologica Anton Dohrn, 80122 Naples, Italy
| | - F Francescangeli
- University of Hamburg, Institute for Geology, Centre for Earth System Research and Sustainability, 20146 Hamburg, Germany
| | - V M P Bouchet
- University of Lille, CNRS, Univ. Littoral Côte d'Opale, UMR 8187, LOG, Laboratoire d'Océanologie et de Géosciences, Station Marine de Wimereux, F 59000 Lille, France
| | - J Pawlowski
- Department of Genetics and Evolution, University of Geneva, 1205 Geneva, Switzerland; ID-Gene ecodiagnostics, Campus Biotech Innovation Park, 1202 Geneva, Switzerland; Institute of Oceanology, Polish Academy of Sciences, 81-712 Sopot, Poland
| | - F Frontalini
- Dipartimento di Scienze Pure e Applicate, Università degli Studi di Urbino "Carlo Bo", 61029 Urbino, Italy
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9
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Russo MT, Ruggiero MV, Manfellotto F, Scriven V, Campbell L, Montresor M, Ferrante MI. New alleles in the mating type determination region of West Atlantic strains of Pseudo-nitzschia multistriata. Harmful Algae 2021; 103:101995. [PMID: 33980435 DOI: 10.1016/j.hal.2021.101995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 01/15/2021] [Accepted: 01/25/2021] [Indexed: 06/12/2023]
Abstract
The cosmopolitan, species-rich diatom genus Pseudo-nitzschia represents a good system for the study of speciation, evolution and diversity. Understanding elements linked to population dynamics and life cycle regulation for these species is of particular importance in view of their ability to produce the toxin domoic acid and cause harmful blooms. Pseudo-nitzschia multistriata, one of the toxic species that represents a model for the study of life cycle related questions, is the only diatom for which a sex determination mechanism has been described. Populations in the Gulf of Naples (Mediterranean Sea), can share four different allelic variants (A, M, B, N) of the mating type determination region, and one of them (A) is responsible for the determination of the mating type + (MT+), defined by the MT+ restricted expression of the gene MRP3. Here, we analysed the sex determination genomic region in three new strains isolated from the Gulf of Mexico and compared it to the alleles previously described in the Mediterranean strains. We first show that these geographically distant strains of P. multistriata belong to different populations but can interbreed. Next, we show that the two populations share an overall similar structure of the genomic locus although differences can be seen in the polymorphic regions upstream of MRP3. In strain P4-C1, we amplified and sequenced an allele (M) identical to one of those previously characterized in the Mediterranean strains. In the other two strains, P4-C2 and P4-C5, we identified three new alleles, which we named A2, B2 and N2. P4-C2 and P4-C5 are heterozygous and share the common allele A2 linked to the monoallelic expression of the MT+ specific sex determining gene MRP3. Our results expand information on the global distribution of P. multistriata and on the level of conservation of the sex determination region in different populations. The definition of the extent of intra- and inter-specific conservation of this region would be a relevant addition to our understanding of Pseudo-nitzschia diversity and evolution.
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Affiliation(s)
| | | | | | - Victoria Scriven
- Department of Oceanography, Texas A&M University, 3146 TAMU, College Station, TX 77843, USA
| | - Lisa Campbell
- Department of Oceanography, Texas A&M University, 3146 TAMU, College Station, TX 77843, USA
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy.
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10
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Zingone A, Escalera L, Aligizaki K, Fernández-Tejedor M, Ismael A, Montresor M, Mozetič P, Taş S, Totti C. Toxic marine microalgae and noxious blooms in the Mediterranean Sea: A contribution to the Global HAB Status Report. Harmful Algae 2021; 102:101843. [PMID: 33875177 DOI: 10.1016/j.hal.2020.101843] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 05/22/2020] [Accepted: 05/25/2020] [Indexed: 06/12/2023]
Abstract
We review the spatial distribution of toxic marine microalgal species and the impacts of all types of harmful algal events (Harmful Algal Blooms, HABs) in the Mediterranean Sea (MS), including the Black Sea, the Sea of Marmara, coastal lagoons and transitional waters, based on two databases compiled in the Ocean Biogeographic Information System (OBIS). Eighty-four potentially toxic species have been detected in the MS (2,350 records), of which 16 described from these waters between 1860 and 2014 and a few suspected to have been introduced. More than half of these species (46) produce toxins that may affect human health, the remainders ichthyotoxic substances (29) or other types of toxins (9). Nevertheless, toxicity-related events are not frequent in the MS (308 records in 31 years), and mainly consist of impacts on aquaculture, caused by the dinoflagellates Dinophysis and Alexandrium, along with a few actual shellfish poisoning cases. Pseudo-nitzschia blooms are widespread, but domoic acid in shellfish rarely exceeds regulatory levels. Fish kills are probably less sporadic than reported, representing a problem at a few places along the southern MS coasts and in the Ebro River Delta. Since the last decade of the 20th century, blooms of the benthic dinoflagellates Ostreopsis cf. ovata have regularly occurred all along rocky shores of the MS, at times with human health problems caused by toxic aerosol. New records of Gambierdiscus and Fukuyoa, until now reported for the westernmost and easternmost MS coasts, raise concerns about the risk of ciguatera, a syndrome so far known only for subtropical and tropical areas. Recent discoveries are the dinoflagellates Vulcanodinium rugosum, responsible for the presence of pinnatoxins in French lagoons' shellfish, and the azaspiracid-producers Azadinium spp. Mucilages and discolorations have a major impact on tourism in summer. Reports of toxic species and HABs have apparently increased in the MS over the last half century, which is likely related to the increased awareness and monitoring operations rather than to an actual increase of these phenomena. Indeed, while the case of Ostreopsis appears as a sudden upsurge rather than a trend, no actual increase of toxic or noxious events has so far emerged in intensively studied areas, such as the French and Spanish coasts or the Adriatic Sea. Moreover, some cases of decrease are reported, e.g., for Alexandrium minutum blooms disappearing from the Harbour of Alexandria. Overall, main HAB risks derive from cases of massive development of microalgal biomass and consequent impacts of reduced coastal water quality on tourism, which represents the largest part of the marine economy along the MS coasts.
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Affiliation(s)
- Adriana Zingone
- Integrative Marine Ecology Department, Stazione Zoologica Anton Dohrn, 80121 Naples, Italy.
| | - Laura Escalera
- Research Infrastructures for Marine Biological Resources, Stazione Zoologica Anton Dohrn, 80121 Naples, Italy.
| | - Katerina Aligizaki
- Laboratory Unit for Harmful Marine Microalgae, Biology Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | | | - Amany Ismael
- Faculty of Science, Alexandria University, 2151 Moharram Bey, Egypt.
| | - Marina Montresor
- Integrative Marine Ecology Department, Stazione Zoologica Anton Dohrn, 80121 Naples, Italy.
| | - Patricija Mozetič
- National Institute of Biology, Marine Biological Station Piran, 6330 Piran, Slovenia.
| | - Seyfettin Taş
- Institute of Marine Sciences and Management, University of Istanbul, 34134 Istanbul, Turkey.
| | - Cecilia Totti
- Department of Life and Environmental Sciences, Università Politecnica delle Marche, 60131 Ancona, Italy.
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11
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Pelusi A, De Luca P, Manfellotto F, Thamatrakoln K, Bidle KD, Montresor M. Virus-induced spore formation as a defense mechanism in marine diatoms. New Phytol 2021; 229:2251-2259. [PMID: 32978816 PMCID: PMC7894508 DOI: 10.1111/nph.16951] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 09/09/2020] [Indexed: 05/03/2023]
Abstract
Algal viruses are important contributors to carbon cycling, recycling nutrients and organic material through host lysis. Although viral infection has been described as a primary mechanism of phytoplankton mortality, little is known about host defense responses. We show that viral infection of the bloom-forming, planktonic diatom Chaetoceros socialis induces the mass formation of resting spores, a heavily silicified life cycle stage associated with carbon export due to rapid sinking. Although viral RNA was detected within spores, mature virions were not observed. 'Infected' spores were capable of germinating, but did not propagate or transmit infectious viruses. These results demonstrate that diatom spore formation is an effective defense strategy against viral-mediated mortality. They provide a possible mechanistic link between viral infection, bloom termination, and mass carbon export events and highlight an unappreciated role of viruses in regulating diatom life cycle transitions and ecological success.
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Affiliation(s)
- Angela Pelusi
- Department of Integrative Marine EcologyStazione Zoologica Anton DohrnVilla ComunaleNaples80121Italy
| | - Pasquale De Luca
- Research Infrastructures for Marine Biological ResourcesStazione Zoologica Anton DohrnVilla ComunaleNaples80121Italy
| | - Francesco Manfellotto
- Department of Integrative Marine EcologyStazione Zoologica Anton DohrnVilla ComunaleNaples80121Italy
| | | | - Kay D. Bidle
- Department of Marine and Coastal SciencesRutgers UniversityNew BrunswickNJ08901‐8520USA
| | - Marina Montresor
- Department of Integrative Marine EcologyStazione Zoologica Anton DohrnVilla ComunaleNaples80121Italy
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12
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Mertens KN, Adachi M, Anderson DM, Band-Schmidt CJ, Bravo I, Brosnahan ML, Bolch CJS, Calado AJ, Carbonell-Moore MC, Chomérat N, Elbrächter M, Figueroa RI, Fraga S, Gárate-Lizárraga I, Garcés E, Gu H, Hallegraeff G, Hess P, Hoppenrath M, Horiguchi T, Iwataki M, John U, Kremp A, Larsen J, Leaw CP, Li Z, Lim PT, Litaker W, MacKenzie L, Masseret E, Matsuoka K, Moestrup Ø, Montresor M, Nagai S, Nézan E, Nishimura T, Okolodkov YB, Orlova TY, Reñé A, Sampedro N, Satta CT, Shin HH, Siano R, Smith KF, Steidinger K, Takano Y, Tillmann U, Wolny J, Yamaguchi A, Murray S. Morphological and phylogenetic data do not support the split of Alexandrium into four genera. Harmful Algae 2020; 98:101902. [PMID: 33129459 DOI: 10.1016/j.hal.2020.101902] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 09/02/2020] [Accepted: 09/09/2020] [Indexed: 06/11/2023]
Abstract
A recently published study analyzed the phylogenetic relationship between the genera Centrodinium and Alexandrium, confirming an earlier publication showing the genus Alexandrium as paraphyletic. This most recent manuscript retained the genus Alexandrium, introduced a new genus Episemicolon, resurrected two genera, Gessnerium and Protogonyaulax, and stated that: "The polyphyly [sic] of Alexandrium is solved with the split into four genera". However, these reintroduced taxa were not based on monophyletic groups. Therefore this work, if accepted, would result in replacing a single paraphyletic taxon with several non-monophyletic ones. The morphological data presented for genus characterization also do not convincingly support taxa delimitations. The combination of weak molecular phylogenetics and the lack of diagnostic traits (i.e., autapomorphies) render the applicability of the concept of limited use. The proposal to split the genus Alexandrium on the basis of our current knowledge is rejected herein. The aim here is not to present an alternative analysis and revision, but to maintain Alexandrium. A better constructed and more phylogenetically accurate revision can and should wait until more complete evidence becomes available and there is a strong reason to revise the genus Alexandrium. The reasons are explained in detail by a review of the available molecular and morphological data for species of the genera Alexandrium and Centrodinium. In addition, cyst morphology and chemotaxonomy are discussed, and the need for integrative taxonomy is highlighted.
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Affiliation(s)
- Kenneth Neil Mertens
- Ifremer, LER BO, Station de Biologie Marine, Place de la Croix, BP40537, F-29185 Concarneau Cedex, France.
| | - Masao Adachi
- Laboratory of Aquatic Environmental Science (LAQUES), Faculty of Agriculture and Marine Science, Kochi University, 200 Otsu, Monobe, Nankoku, Kochi 783-8502, Japan
| | | | - Christine J Band-Schmidt
- Departamento de Plancton y Ecología Marina, Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas (IPN-CICIMAR), La Paz, B.C.S. 23096, Mexico
| | - Isabel Bravo
- Instituto Español de Oceanografía (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain
| | | | - Christopher J S Bolch
- Institute for Marine & Antarctic Studies, University of Tasmania, Locked Bag 1370, Launceston TAS 7250, Australia
| | - António J Calado
- Department of Biology and GeoBioTec Research Unit, University of Aveiro, P-3810-193 Aveiro, Portugal
| | - M Consuelo Carbonell-Moore
- Department of Botany and Plant Pathology, College of Agricultural Sciences, Oregon State University, Corvallis, OR 97331-2902, USA
| | - Nicolas Chomérat
- Ifremer, LER BO, Station de Biologie Marine, Place de la Croix, BP40537, F-29185 Concarneau Cedex, France
| | - Malte Elbrächter
- Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung Sylt, Hafenstr. 43, 25992 List/Sylt, Germany
| | - Rosa Isabel Figueroa
- Instituto Español de Oceanografía (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain
| | | | - Ismael Gárate-Lizárraga
- Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Apartado Postal 592, Col. Centro, La Paz, B.C.S. 23000, Mexico
| | - Esther Garcés
- Departament de Biologia Marina i Oceanografía, Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), Pg. Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain
| | - Haifeng Gu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Gustaaf Hallegraeff
- Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, Tasmania 7001, Australia
| | - Philipp Hess
- Ifremer, DYNECO, Laboratoire Phycotoxines, Rue de l'Ile d'Yeu, 44311 Nantes, France
| | - Mona Hoppenrath
- Senckenberg am Meer, German Center for Marine Biodiversity Research, Wilhelmshaven, Germany
| | - Takeo Horiguchi
- Department of Biological Sciences, Faculty of Science, Hokkaido University, North 10, West 8, Sapporo 060-0810, Hokkaido, Japan
| | - Mitsunori Iwataki
- Asian Natural Environmental Science Center, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan
| | - Uwe John
- Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
| | - Anke Kremp
- Leibniz Institut für Ostseeforschung Warnemünde, Seestr. 15, 18119 Rostock, Germany
| | - Jacob Larsen
- Marine Biological Section, Department of Biology, University of Copenhagen, Universitetsparken 4, DK-2100 Copenhagen Ø, Denmark
| | - Chui Pin Leaw
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Zhun Li
- Biological Resource Center/Korean Collection for Type Cultures (KCTC), Korea Research Institute of Bioscience and Biotechnology, Jeongeup 56212, Republic of Korea
| | - Po Teen Lim
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Wayne Litaker
- CSS Inc. Under contract to NOS/NOAA, Center for Coastal Fisheries and Habitat Research, 101 Pivers Island Road, Beaufort, NC 28516, USA
| | - Lincoln MacKenzie
- Coastal & Freshwater Group, Cawthron Institute, Private Bag 2, 98 Halifax Street East, Nelson 7042, New Zealand
| | - Estelle Masseret
- MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, Montpellier, France
| | - Kazumi Matsuoka
- C/O Institute for East China Sea Research, Nagasaki University, 1551-7 Taira-machi, Nagasaki 851-2213, Japan
| | - Øjvind Moestrup
- Marine Biological Section, Department of Biology, University of Copenhagen, Universitetsparken 4, DK-2100 Copenhagen Ø, Denmark
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy
| | - Satoshi Nagai
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan
| | - Elisabeth Nézan
- Ifremer, LER BO, Station de Biologie Marine, Place de la Croix, BP40537, F-29185 Concarneau Cedex, France; National Museum of Natural History, DGD-REVE, Station de Biologie Marine de Concarneau, Place de la Croix, 29900 Concarneau, France
| | - Tomohiro Nishimura
- Coastal & Freshwater Group, Cawthron Institute, Private Bag 2, 98 Halifax Street East, Nelson 7042, New Zealand
| | - Yuri B Okolodkov
- Universidad Veracruzana, Instituto de Ciencias Marinas y Pesquerías, Laboratorio de Botánica Marina y Planctología, Calle Mar Mediterráneo No. 314, Fracc. Costa Verde, C.P. 94294 Boca del Río, Veracruz, Mexico
| | - Tatiana Yu Orlova
- A.V. Zhirmunsky National Scientific Center of Marine Biology of the Far Eastern Branch of the Russian Academy of Sciences, Palchevskogo Street, 17, Vladivostok 690041, Russia
| | - Albert Reñé
- Departament de Biologia Marina i Oceanografía, Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), Pg. Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain
| | - Nagore Sampedro
- Departament de Biologia Marina i Oceanografía, Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), Pg. Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain
| | - Cecilia Teodora Satta
- Dipartimento di Architettura, Design e Urbanistica, University of Sassari, Via Piandanna 4, 07100 Sassari, Italy
| | - Hyeon Ho Shin
- Library of Marine Samples, Korea Institute of Ocean Science and Technology, Geoje, Republic of Korea
| | | | - Kirsty F Smith
- Coastal & Freshwater Group, Cawthron Institute, Private Bag 2, 98 Halifax Street East, Nelson 7042, New Zealand
| | - Karen Steidinger
- Florida Fish and Wildlife Conservation Commission Fish and Wildlife Research Institute, 100 8th Avenue SE St. Petersburg, FL 33701, USA
| | | | - Urban Tillmann
- Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
| | - Jennifer Wolny
- Maryland Department of Natural Resources, 1919 Lincoln Drive Annapolis, MD 21401 USA
| | - Aika Yamaguchi
- Department of Biological Sciences, Faculty of Science, Hokkaido University, North 10, West 8, Sapporo 060-0810, Hokkaido, Japan
| | - Shauna Murray
- Climate Change Cluster, University of Technology Sydney, Ultimo, NSW 2007, Australia
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13
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Gallo A, Guida M, Armiento G, Siciliano A, Mormile N, Carraturo F, Pellegrini D, Morroni L, Tosti E, Ferrante MI, Montresor M, Molisso F, Sacchi M, Danovaro R, Lofrano G, Libralato G. Species-specific sensitivity of three microalgae to sediment elutriates. Mar Environ Res 2020; 156:104901. [PMID: 32056796 DOI: 10.1016/j.marenvres.2020.104901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 02/03/2020] [Accepted: 02/03/2020] [Indexed: 06/10/2023]
Abstract
Microalgae are considered good bioindicators of marine environmental quality. Frequently, they are used to investigate the toxicity of sediment elutriates, but their sensitivity is disputed. This paper compared the sensitivity of Phaeodactylum tricornutum (diatom), Skeletonema costatum (diatom), and Dunaliella tertiolecta (green alga), analyzing 257 samples of elutriates (1:4 sediment: water ratio), considering growth inhibition (72 h) as the reference endpoint and sediment chemical (metals, metalloids and polyaromatic hydrocarbons) and grain size. Results of the toxicity tests showed that the microalgae sensitivity was not correlated. The integration of chemical data did not allow to discriminate toxicity effects but contributed to highlight that D. tertiolecta was the most sensitive microalgae (no cell wall) followed by P. tricornutum and S. costatum. Further analysis, including lines of evidence and weight of evidence approaches to calculate risk quotients of elutriate samples, confirmed these results.
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Affiliation(s)
- A Gallo
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | - M Guida
- Department of Biology, University of Naples Federico II, Via Cinthia, 21, 80126, Naples, Italy; Department of Marine Biotechnology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - G Armiento
- ENEA, Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile, Centro Ricerche Casaccia, Via Anguillarese, 301, 00123, Roma, Italy
| | - A Siciliano
- Department of Biology, University of Naples Federico II, Via Cinthia, 21, 80126, Naples, Italy
| | - N Mormile
- Department of Biology, University of Naples Federico II, Via Cinthia, 21, 80126, Naples, Italy
| | - F Carraturo
- Department of Biology, University of Naples Federico II, Via Cinthia, 21, 80126, Naples, Italy
| | - D Pellegrini
- ISPRA, Italian Institute for Environmental Protection and Research, Via del Cedro (c/o Dogana d'Acqua), 57122, Livorno, Italy
| | - L Morroni
- ISPRA, Italian Institute for Environmental Protection and Research, Via del Cedro (c/o Dogana d'Acqua), 57122, Livorno, Italy
| | - E Tosti
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | - M I Ferrante
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | - M Montresor
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | - F Molisso
- Istituto per le Scienze Marine (ISMAR), Consiglio Nazionale delle Ricerche (CNR), Calata Porta di Massa, 80133, Napoli, Italy
| | - M Sacchi
- Istituto per le Scienze Marine (ISMAR), Consiglio Nazionale delle Ricerche (CNR), Calata Porta di Massa, 80133, Napoli, Italy
| | - R Danovaro
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy; Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy
| | - G Lofrano
- Centro Servizi Metrologici e Tecnologici Avanzati (CeSMA), Complesso Universitario di Monte Sant'Angelo, Via Cinthia 21, 80126, Naples, Italy
| | - G Libralato
- Department of Biology, University of Naples Federico II, Via Cinthia, 21, 80126, Naples, Italy; Department of Marine Biotechnology, Stazione Zoologica Anton Dohrn, Naples, Italy.
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14
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Gaonkar CC, Piredda R, Sarno D, Zingone A, Montresor M, Kooistra WHCF. Species detection and delineation in the marine planktonic diatoms Chaetoceros and Bacteriastrum through metabarcoding: making biological sense of haplotype diversity. Environ Microbiol 2020; 22:1917-1929. [PMID: 32157787 DOI: 10.1111/1462-2920.14984] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 03/07/2020] [Indexed: 12/11/2022]
Abstract
High-throughput sequencing (HTS) metabarcoding is commonly applied to assess phytoplankton diversity. Usually, haplotypes are grouped into operational taxonomic units (OTUs) through clustering, whereby the resulting number of OTUs depends on chosen similarity thresholds. We applied, instead, a phylogenetic approach to infer taxa among 18S rDNA V4-metabarcode haplotypes gathered from 48 time-series samples using the marine planktonic diatoms Chaetoceros and Bacteriastrum as test case. The 73 recovered taxa comprised both solitary haplotypes and polytomies, the latter composed each of a highly abundant, dominant haplotype and one to several minor, peripheral haplotypes. The solitary and dominant haplotypes usually matched reference sequences, enabling species assignation of taxa. We hypothesise that the super-abundance of reads in dominant haplotypes results from the homogenization effect of concerted evolution. Reads of populous peripheral haplotypes and dominant haplotypes show comparable distribution patterns over the sample dates, suggesting that they are part of the same population. Many taxa revealed marked seasonality, with closely related ones generally showing distinct periodicity, whereas others occur year-round. Phylogenies inferred from metabarcode haplotypes enable delineation of biologically meaningful taxa, whereas OTUs resulting from clustering algorithms often deviate markedly from such taxa.
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Affiliation(s)
- Chetan C Gaonkar
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | - Roberta Piredda
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | - Diana Sarno
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | - Adriana Zingone
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | - Marina Montresor
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | - Wiebe H C F Kooistra
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
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Pelusi A, Rotolo F, Gallo A, Ferrante MI, Montresor M. Effects of elutriates from contaminated coastal sediments on different life cycle phases of planktonic diatoms. Mar Environ Res 2020; 155:104890. [PMID: 32072992 DOI: 10.1016/j.marenvres.2020.104890] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 01/21/2020] [Accepted: 01/21/2020] [Indexed: 06/10/2023]
Abstract
We assessed the effects of elutriates from sediments collected at three stations in the polluted Bay of Bagnoli-Coroglio along the Campania coast (Tyrrhenian Sea, Italy) using three planktonic diatoms regularly occurring in the area, Pseudo-nitzschia multistriata, P. arenysensis and Chaetoceros socialis. Specifically, we tested the production of sexual stages in the heterothallic Pseudo-nitzschia species with the hypothesis that pollutants could impair sexual reproduction. We also tested the seeding capacity of spores of C. socialis after up to six months of storage in elutriates, assuming that pollutants could affect the capability of resting stages to germinate. Elutriate from station 56, with the highest concentrations of pollutants, impaired growth, sexual reproduction and spore germination. Elutriates from stations 25 and 84 caused moderate enhancement of growth and sexual reproduction in Pseudo-nitzschia as compared with control conditions, and also had intermediate effect on spore seeding capacity.
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Affiliation(s)
- A Pelusi
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Napoli, Italy
| | - F Rotolo
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Napoli, Italy
| | - A Gallo
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Napoli, Italy
| | - M I Ferrante
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Napoli, Italy
| | - M Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Napoli, Italy.
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16
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García-Portela M, Reguera B, Ribera d'Alcalà M, Rodríguez F, Montresor M. Effects of small-scale turbulence on two species of Dinophysis. Harmful Algae 2019; 89:101654. [PMID: 31672223 DOI: 10.1016/j.hal.2019.101654] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 06/21/2019] [Accepted: 07/31/2019] [Indexed: 06/10/2023]
Abstract
Dinoflagellate species of Dinophysis, in particular D. acuminata and D. acuta, produce lipophilic toxins that pose a threat to human health when concentrated in shellfish and jeopardize shellfish exploitations in western Europe. In northwestern Iberia, D. acuminata has a long growing season, from spring to early autumn, and populations develop as soon as shallow stratification forms when the upwelling season begins. In contrast, D. acuta blooms in late summer, when the depth of the pycnocline is maximal and upwelling pulses are moderate. In situ observations on the hydrodynamic regimes during the two windows of opportunity for Dinophysis species led us to hypothesize that D. acuta should be more sensitive to turbulence than D. acuminata. To test this hypothesis, we studied the response of D. acuminata and D. acuta to three realistic turbulence levels low (LT), ε ≈ 10-6 m2 s-3; medium (MT), ε ≈ 10-5 m2 s-3 and high (HT), ε ≈ 10-4 m2 s-3generated by Turbogen, a highly reproducible, computer-controlled system. Cells of both species exposed to LT and MT grew at rates similar to the controls. Marked differences were found in the response to HT: D. acuminata grew slowly after an initial lag phase, whereas D. acuta cell numbers declined. Results from this study support the hypothesis that turbulence may play a role in shaping the spatio-temporal distribution of individual species of Dinophysis. We also hypothesize that, in addition to cell disturbance affecting division, sustained high shear generated by microturbulence may cause a decline in Dinophysis numbers due to decreased densities of ciliate prey.
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Affiliation(s)
- María García-Portela
- Harmful Microalgae Group (VGOHAB), Centro Oceanográfico de Vigo, IEO, Vigo, Spain.
| | - Beatriz Reguera
- Harmful Microalgae Group (VGOHAB), Centro Oceanográfico de Vigo, IEO, Vigo, Spain.
| | | | - Francisco Rodríguez
- Harmful Microalgae Group (VGOHAB), Centro Oceanográfico de Vigo, IEO, Vigo, Spain.
| | - Marina Montresor
- Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy.
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Patil S, Moeys S, von Dassow P, Huysman MJJ, Mapleson D, De Veylder L, Sanges R, Vyverman W, Montresor M, Ferrante MI. Correction to: Identification of the meiotic toolkit in diatoms and exploration of meiosis-specific SPO11 and RAD51 homologs in the sexual species Pseudo-nitzschia multistriata and Seminavis robusta. BMC Genomics 2019; 20:544. [PMID: 31277569 PMCID: PMC6610888 DOI: 10.1186/s12864-019-5942-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 06/27/2019] [Indexed: 11/10/2022] Open
Abstract
Following the publication of this article [1], the authors reported that the link to Additional file 11 linked to the wrong set of data. The correct supplementary data is provided in this Correction article (Additional file 11).
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Affiliation(s)
- Shrikant Patil
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Naples, Italy
| | - Sara Moeys
- Department of Biology, Protistology and Aquatic Ecology, Ghent University, 9000, Ghent, Belgium.,Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), 9052, Ghent, Belgium.,Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Ghent, Belgium
| | - Peter von Dassow
- Facultad de Ciencias Biológicas, Instituto Milenio de Oceanografía, Pontificia Universidad Católica de Chile, Santiago, Chile.,UMI 3614, Evolutionary Biology and Ecology of Algae, CNRS-UPMC Sorbonne Universités, PUCCh, UACH, Station Biologique de Roscoff, Roscoff, France
| | - Marie J J Huysman
- Department of Biology, Protistology and Aquatic Ecology, Ghent University, 9000, Ghent, Belgium.,Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), 9052, Ghent, Belgium.,Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Ghent, Belgium
| | - Daniel Mapleson
- The Genome Analysis Centre (TGAC), Norwich Research Park, Norwich, NR4 7UH, UK
| | - Lieven De Veylder
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), 9052, Ghent, Belgium.,Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Ghent, Belgium
| | - Remo Sanges
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Naples, Italy
| | - Wim Vyverman
- Department of Biology, Protistology and Aquatic Ecology, Ghent University, 9000, Ghent, Belgium
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Naples, Italy
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Zingone A, D'Alelio D, Mazzocchi MG, Montresor M, Sarno D, team LTERMC. Time series and beyond: multifaceted plankton research at a marine Mediterranean LTER site. NC 2019. [DOI: 10.3897/natureconservation.34.30789] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Plankton are a pivotal component of the diversity and functioning of coastal marine ecosystems. A long time-series of observations is the best tool to trace their patterns and variability over multiple scales, ultimately providing a sound foundation for assessing, modelling and predicting the effects of anthropogenic and natural environmental changes on pelagic communities. At the same time, a long time-series constitutes a formidable asset for different kinds of research on specific questions that emerge from the observations, whereby the results of these complementary studies provide precious interpretative tools that augment the informative value of the data collected. In this paper, we review more than 140 studies that have been developed around a Mediterranean plankton time series gathered in the Gulf of Naples at the station LTER-MC since 1984. These studies have addressed different topics concerning marine plankton, which have included: i) seasonal patterns and trends; ii) taxonomic diversity, with a focus on key or harmful algal species and the discovery of many new taxa; iii) molecular diversity of selected species, groups of species or the whole planktonic community; iv) life cycles of several phyto- and zooplankton species; and v) interactions among species through trophic relationships, parasites and viruses. Overall, the products of this research demonstrate the great value of time series besides the record of fluctuations and trends, and highlight their primary role in the development of the scientific knowledge of plankton much beyond the local scale.
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Gaonkar CC, Piredda R, Minucci C, Mann DG, Montresor M, Sarno D, Kooistra WHCF. Annotated 18S and 28S rDNA reference sequences of taxa in the planktonic diatom family Chaetocerotaceae. PLoS One 2018; 13:e0208929. [PMID: 30586452 PMCID: PMC6306197 DOI: 10.1371/journal.pone.0208929] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 11/26/2018] [Indexed: 02/07/2023] Open
Abstract
The species-rich diatom family Chaetocerotaceae is common in the coastal marine phytoplankton worldwide where it is responsible for a substantial part of the primary production. Despite its relevance for the global cycling of carbon and silica, many species are still described only morphologically, and numerous specimens do not fit any described taxa. Nowadays, studies to assess plankton biodiversity deploy high throughput sequencing metabarcoding of the 18S rDNA V4 region, but to translate the gathered metabarcodes into biologically meaningful taxa, there is a need for reference barcodes. However, 18S reference barcodes for this important family are still relatively scarce. We provide 18S rDNA and partial 28S rDNA reference sequences of 443 morphologically characterized chaetocerotacean strains. We gathered 164 of the 216 18S sequences and 244 of the 413 28S sequences of strains from the Gulf of Naples, Atlantic France, and Chile. Inferred phylogenies showed 84 terminal taxa in seven principal clades. Two of these clades included terminal taxa whose rDNA sequences contained spliceosomal and Group IC1 introns. Regarding the commonly used metabarcode markers in planktonic diversity studies, all terminal taxa can be discriminated with the 18S V4 hypervariable region; its primers fit their targets in all but two species, and the V4-tree topology is similar to that of the 18S. Hence V4-metabarcodes of unknown Chaetocerotaceae are assignable to the family. Regarding the V9 hypervariable region, most terminal taxa can be discriminated, but several contain introns in their primer targets. Moreover, poor phylogenetic resolution of the V9 region affects placement of metabarcodes of putative but unknown chaetocerotacean taxa, and hence, uncertainty in taxonomic assignment, even of higher taxa.
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Affiliation(s)
- Chetan C. Gaonkar
- Integrative Marine Ecology Department, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - Roberta Piredda
- Integrative Marine Ecology Department, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - Carmen Minucci
- Integrative Marine Ecology Department, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - David G. Mann
- Royal Botanic Garden Edinburgh, Edinburgh, Scotland, United Kingdom, and Institut de Recerca i Tecnologia Agroalimentaries, Sant Carles de La Ràpita, Catalonia, Spain
| | - Marina Montresor
- Integrative Marine Ecology Department, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - Diana Sarno
- Integrative Marine Ecology Department, Stazione Zoologica Anton Dohrn, Napoli, Italy
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Russo MT, Vitale L, Entrambasaguas L, Anestis K, Fattorini N, Romano F, Minucci C, De Luca P, Biffali E, Vyverman W, Sanges R, Montresor M, Ferrante MI. MRP3 is a sex determining gene in the diatom Pseudo-nitzschia multistriata. Nat Commun 2018; 9:5050. [PMID: 30487611 PMCID: PMC6261938 DOI: 10.1038/s41467-018-07496-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 11/05/2018] [Indexed: 01/01/2023] Open
Abstract
A broad diversity of sex-determining systems has evolved in eukaryotes. However, information on the mechanisms of sex determination for unicellular microalgae is limited, including for diatoms, key-players of ocean food webs. Here we report the identification of a mating type (MT) determining gene for the diatom Pseudo-nitzschia multistriata. By comparing the expression profile of the two MTs, we find five MT-biased genes, of which one, MRP3, is expressed exclusively in MT+ strains in a monoallelic manner. A short tandem repeat of specific length in the region upstream of MRP3 is consistently present in MT+ and absent in MT- strains. MRP3 overexpression in an MT- strain induces sex reversal: the transgenic MT- can mate with another MT- strain and displays altered regulation of the other MT-biased genes, indicating that they lie downstream. Our data show that a relatively simple genetic program is involved in defining the MT in P. multistriata.
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Affiliation(s)
- Monia T Russo
- Stazione Zoologica Anton Dohrn of Naples, Villa Comunale, 80121, Naples, Italy
| | - Laura Vitale
- Stazione Zoologica Anton Dohrn of Naples, Villa Comunale, 80121, Naples, Italy
| | | | | | - Neri Fattorini
- Stazione Zoologica Anton Dohrn of Naples, Villa Comunale, 80121, Naples, Italy
| | - Filomena Romano
- Stazione Zoologica Anton Dohrn of Naples, Villa Comunale, 80121, Naples, Italy
| | - Carmen Minucci
- Stazione Zoologica Anton Dohrn of Naples, Villa Comunale, 80121, Naples, Italy
| | - Pasquale De Luca
- Stazione Zoologica Anton Dohrn of Naples, Villa Comunale, 80121, Naples, Italy
| | - Elio Biffali
- Stazione Zoologica Anton Dohrn of Naples, Villa Comunale, 80121, Naples, Italy
| | - Wim Vyverman
- Protistology and Aquatic Ecology, Department of Biology, Ghent University, 9000, Gent, Belgium
| | - Remo Sanges
- Stazione Zoologica Anton Dohrn of Naples, Villa Comunale, 80121, Naples, Italy.,Scuola Internazionale Superiore di Studi Avanzati (SISSA), via Bonomea 265, 34136, Trieste, Italy
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn of Naples, Villa Comunale, 80121, Naples, Italy
| | - Maria I Ferrante
- Stazione Zoologica Anton Dohrn of Naples, Villa Comunale, 80121, Naples, Italy.
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Bates SS, Hubbard KA, Lundholm N, Montresor M, Leaw CP. Pseudo-nitzschia, Nitzschia, and domoic acid: New research since 2011. Harmful Algae 2018; 79:3-43. [PMID: 30420013 DOI: 10.1016/j.hal.2018.06.001] [Citation(s) in RCA: 147] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 06/04/2018] [Accepted: 06/04/2018] [Indexed: 05/11/2023]
Abstract
Some diatoms of the genera Pseudo-nitzschia and Nitzschia produce the neurotoxin domoic acid (DA), a compound that caused amnesic shellfish poisoning (ASP) in humans just over 30 years ago (December 1987) in eastern Canada. This review covers new information since two previous reviews in 2012. Nitzschia bizertensis was subsequently discovered to be toxigenic in Tunisian waters. The known distribution of N. navis-varingica has expanded from Vietnam to Malaysia, Indonesia, the Philippines and Australia. Furthermore, 15 new species (and one new variety) of Pseudo-nitzschia have been discovered, bringing the total to 52. Seven new species were found to produce DA, bringing the total of toxigenic species to 26. We list all Pseudo-nitzschia species, their ability to produce DA, and show their global distribution. A consequence of the extended distribution and increased number of toxigenic species worldwide is that DA is now found more pervasively in the food web, contaminating new marine organisms (especially marine mammals), affecting their physiology and disrupting ecosystems. Recent findings highlight how zooplankton grazers can induce DA production in Pseudo-nitzschia and how bacteria interact with Pseudo-nitzschia. Since 2012, new discoveries have been reported on physiological controls of Pseudo-nitzschia growth and DA production, its sexual reproduction, and infection by an oomycete parasitoid. Many advances are the result of applying molecular approaches to discovering new species, and to understanding the population genetic structure of Pseudo-nitzschia and mechanisms used to cope with iron limitation. The availability of genomes from three Pseudo-nitzschia species, coupled with a comparative transcriptomic approach, has allowed advances in our understanding of the sexual reproduction of Pseudo-nitzschia, its signaling pathways, its interactions with bacteria, and genes involved in iron and vitamin B12 and B7 metabolism. Although there have been no new confirmed cases of ASP since 1987 because of monitoring efforts, new blooms have occurred. A massive toxic Pseudo-nitzschia bloom affected the entire west coast of North America during 2015-2016, and was linked to a 'warm blob' of ocean water. Other smaller toxic blooms occurred in the Gulf of Mexico and east coast of North America. Knowledge gaps remain, including how and why DA and its isomers are produced, the world distribution of potentially toxigenic Nitzschia species, the prevalence of DA isomers, and molecular markers to discriminate between toxigenic and non-toxigenic species and to discover sexually reproducing populations in the field.
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Affiliation(s)
- Stephen S Bates
- Fisheries and Oceans Canada, Gulf Fisheries Centre, P.O. Box 5030, Moncton, New Brunswick, E1C 9B6, Canada.
| | - Katherine A Hubbard
- Fish and Wildlife Research Institute (FWRI), Florida Fish and Wildlife Conservation Commission (FWC), 100 Eighth Avenue SE, St. Petersburg, FL 33701 USA; Woods Hole Center for Oceans and Human Health, Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA, 02543 USA
| | - Nina Lundholm
- Natural History Museum of Denmark, University of Copenhagen, Sølvgade 83S, DK-1307 Copenhagen K, Denmark
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy
| | - Chui Pin Leaw
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
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Mordret S, Piredda R, Vaulot D, Montresor M, Kooistra WHCF, Sarno D. dinoref: A curated dinoflagellate (Dinophyceae) reference database for the 18S rRNA gene. Mol Ecol Resour 2018; 18:974-987. [PMID: 29603631 DOI: 10.1111/1755-0998.12781] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 02/15/2018] [Accepted: 02/24/2018] [Indexed: 01/28/2023]
Abstract
Dinoflagellates are a heterogeneous group of protists present in all aquatic ecosystems where they occupy various ecological niches. They play a major role as primary producers, but many species are mixotrophic or heterotrophic. Environmental metabarcoding based on high-throughput sequencing is increasingly applied to assess diversity and abundance of planktonic organisms, and reference databases are definitely needed to taxonomically assign the huge number of sequences. We provide an updated 18S rRNA reference database of dinoflagellates: dinoref. Sequences were downloaded from genbank and filtered based on stringent quality criteria. All sequences were taxonomically curated, classified taking into account classical morphotaxonomic studies and molecular phylogenies, and linked to a series of metadata. dinoref includes 1,671 sequences representing 149 genera and 422 species. The taxonomic assignation of 468 sequences was revised. The largest number of sequences belongs to Gonyaulacales and Suessiales that include toxic and symbiotic species. dinoref provides an opportunity to test the level of taxonomic resolution of different 18S barcode markers based on a large number of sequences and species. As an example, when only the V4 region is considered, 374 of the 422 species included in dinoref can still be unambiguously identified. Clustering the V4 sequences at 98% similarity, a threshold that is commonly applied in metabarcoding studies, resulted in a considerable underestimation of species diversity.
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Affiliation(s)
- Solenn Mordret
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Roberta Piredda
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | - Daniel Vaulot
- Sorbonne Université, CNRS, UMR Adaptation et Diversité en Milieu Marin, Station Biologique, Roscoff, France
| | - Marina Montresor
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
| | | | - Diana Sarno
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy
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Roy S, Montresor M, Cembella A. Key Questions and Recent Research Advances on Harmful Algal Blooms in Fjords and Coastal Embayments. Ecological Studies 2018. [DOI: 10.1007/978-3-319-70069-4_10] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Gaonkar CC, Kooistra WHCF, Lange CB, Montresor M, Sarno D. Two new species in the Chaetoceros socialis complex (Bacillariophyta): C. sporotruncatus and C. dichatoensis, and characterization of its relatives, C. radicans and C. cinctus. J Phycol 2017; 53:889-907. [PMID: 28593733 DOI: 10.1111/jpy.12554] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 05/28/2017] [Indexed: 06/07/2023]
Abstract
The diatom genus Chaetoceros is one of the most abundant and diverse phytoplankton in marine and brackish waters worldwide. Within this genus, Chaetoceros socialis has been cited as one of the most common species. However, recent studies from different geographic areas have shown the presence of pseudo-cryptic diversity within the C. socialis complex. Members of this complex are characterized by curved chains (primary colonies) aggregating into globular clusters, where one of the four setae of each cell curves toward the center of the cluster and the other three orient outwards. New light and electron microscopy observations as well as molecular data on marine planktonic diatoms from the coastal waters off Chile revealed the presence of two new species, Chaetoceros sporotruncatus sp. nov. and C. dichatoensis. sp. nov. belonging to the C. socialis complex. The two new species are similar to other members of the complex (i.e., C. socialis and C. gelidus) in the primary and secondary structure of the colony, the orientation pattern of the setae, and the valve ultrastructure. The only morphological characters that can be used to differentiate the species of this complex are aspects related to resting spore morphology. The two newly described species are closely related to each other and form a sister clade to C. gelidus in molecular phylogenies. We also provide a phylogenetic status along with the morphological characterization of C. radicans and C. cintus, which are genetically related to the C. socialis complex.
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MESH Headings
- Chile
- DNA, Algal/genetics
- Diatoms/classification
- Diatoms/cytology
- Diatoms/genetics
- Diatoms/ultrastructure
- France
- Italy
- Microscopy, Electron, Scanning
- Microscopy, Electron, Transmission
- Phylogeny
- Phytoplankton/classification
- Phytoplankton/cytology
- Phytoplankton/genetics
- Phytoplankton/ultrastructure
- RNA, Ribosomal, 18S/genetics
- RNA, Ribosomal, 28S/genetics
- Sequence Analysis, DNA
- Species Specificity
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Affiliation(s)
- Chetan C Gaonkar
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | | | - Carina B Lange
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
- Department of Oceanography, Centers COPAS Sur-Austral and FONDAP-IDEAL, University of Concepción, Concepción, Chile
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | - Diana Sarno
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
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Basu S, Patil S, Mapleson D, Russo MT, Vitale L, Fevola C, Maumus F, Casotti R, Mock T, Caccamo M, Montresor M, Sanges R, Ferrante MI. Finding a partner in the ocean: molecular and evolutionary bases of the response to sexual cues in a planktonic diatom. New Phytol 2017; 215:140-156. [PMID: 28429538 PMCID: PMC5485032 DOI: 10.1111/nph.14557] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Accepted: 02/25/2017] [Indexed: 05/03/2023]
Abstract
Microalgae play a major role as primary producers in aquatic ecosystems. Cell signalling regulates their interactions with the environment and other organisms, yet this process in phytoplankton is poorly defined. Using the marine planktonic diatom Pseudo-nitzschia multistriata, we investigated the cell response to cues released during sexual reproduction, an event that demands strong regulatory mechanisms and impacts on population dynamics. We sequenced the genome of P. multistriata and performed phylogenomic and transcriptomic analyses, which allowed the definition of gene gains and losses, horizontal gene transfers, conservation and evolutionary rate of sex-related genes. We also identified a small number of conserved noncoding elements. Sexual reproduction impacted on cell cycle progression and induced an asymmetric response of the opposite mating types. G protein-coupled receptors and cyclic guanosine monophosphate (cGMP) are implicated in the response to sexual cues, which overall entails a modulation of cell cycle, meiosis-related and nutrient transporter genes, suggesting a fine control of nutrient uptake even under nutrient-replete conditions. The controllable life cycle and the genome sequence of P. multistriata allow the reconstruction of changes occurring in diatoms in a key phase of their life cycle, providing hints on the evolution and putative function of their genes and empowering studies on sexual reproduction.
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Affiliation(s)
- Swaraj Basu
- Integrative Marine EcologyStazione Zoologica Anton DohrnVilla Comunale 1Naples80121Italy
| | - Shrikant Patil
- Integrative Marine EcologyStazione Zoologica Anton DohrnVilla Comunale 1Naples80121Italy
| | | | - Monia Teresa Russo
- Integrative Marine EcologyStazione Zoologica Anton DohrnVilla Comunale 1Naples80121Italy
| | - Laura Vitale
- Integrative Marine EcologyStazione Zoologica Anton DohrnVilla Comunale 1Naples80121Italy
| | - Cristina Fevola
- Integrative Marine EcologyStazione Zoologica Anton DohrnVilla Comunale 1Naples80121Italy
| | | | - Raffaella Casotti
- Integrative Marine EcologyStazione Zoologica Anton DohrnVilla Comunale 1Naples80121Italy
| | - Thomas Mock
- School of Environmental SciencesUniversity of East AngliaNorwich Research ParkNorwichNR4 7TJUK
| | - Mario Caccamo
- Earlham InstituteNorwich Research ParkNorwichNR4 7UGUK
| | - Marina Montresor
- Integrative Marine EcologyStazione Zoologica Anton DohrnVilla Comunale 1Naples80121Italy
| | - Remo Sanges
- Biology and Evolution of Marine OrganismsStazione Zoologica Anton DohrnVilla Comunale 1Naples80121Italy
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Scalco E, Amato A, Ferrante MI, Montresor M. The sexual phase of the diatom Pseudo-nitzschia multistriata: cytological and time-lapse cinematography characterization. Protoplasma 2016; 253:1421-1431. [PMID: 26494151 DOI: 10.1007/s00709-015-0891-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 09/30/2015] [Indexed: 06/05/2023]
Abstract
Pseudo-nitzschia is a thoroughly studied pennate diatom genus for ecological and biological reasons. Many species in this genus, including Pseudo-nitzschia multistriata, can produce domoic acid, a toxin responsible for amnesic shellfish poisoning. Physiological, phylogenetic and biological features of P. multistriata were studied extensively in the past. Life cycle stages, including the sexual phase, fundamental in diatoms to restore the maximum cell size and avoid miniaturization to death, have been well described for this species. P. multistriata is heterothallic; sexual reproduction is induced when strains of opposite mating type are mixed, and proceeds with cells producing two functionally anisogamous gametes each; however, detailed cytological information for this process is missing. By means of confocal laser scanning microscopy and nuclear staining, we followed the nuclear fate during meiosis, and using time-lapse cinematography, we timed every step of the sexual reproduction process from mate pairing to initial cell hatching. The present paper depicts cytological aspects during gametogenesis in P. multistriata, shedding light on the chloroplast behaviour during sexual reproduction, finely describing the timing of the sexual phases and providing reference data for further studies on the molecular control of this fundamental process.
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Affiliation(s)
- Eleonora Scalco
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy.
| | - Alberto Amato
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
| | | | - Marina Montresor
- Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121, Naples, Italy
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Piredda R, Tomasino MP, D'Erchia AM, Manzari C, Pesole G, Montresor M, Kooistra WHCF, Sarno D, Zingone A. Diversity and temporal patterns of planktonic protist assemblages at a Mediterranean Long Term Ecological Research site. FEMS Microbiol Ecol 2016; 93:fiw200. [DOI: 10.1093/femsec/fiw200] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/25/2016] [Indexed: 11/13/2022] Open
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Forster D, Dunthorn M, Mahé F, Dolan JR, Audic S, Bass D, Bittner L, Boutte C, Christen R, Claverie JM, Decelle J, Edvardsen B, Egge E, Eikrem W, Gobet A, Kooistra WHCF, Logares R, Massana R, Montresor M, Not F, Ogata H, Pawlowski J, Pernice MC, Romac S, Shalchian-Tabrizi K, Simon N, Richards TA, Santini S, Sarno D, Siano R, Vaulot D, Wincker P, Zingone A, de Vargas C, Stoeck T. Benthic protists: the under-charted majority. FEMS Microbiol Ecol 2016; 92:fiw120. [PMID: 27267932 DOI: 10.1093/femsec/fiw120] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/30/2016] [Indexed: 11/13/2022] Open
Abstract
Marine protist diversity inventories have largely focused on planktonic environments, while benthic protists have received relatively little attention. We therefore hypothesize that current diversity surveys have only skimmed the surface of protist diversity in marine sediments, which may harbor greater diversity than planktonic environments. We tested this by analyzing sequences of the hypervariable V4 18S rRNA from benthic and planktonic protist communities sampled in European coastal regions. Despite a similar number of OTUs in both realms, richness estimations indicated that we recovered at least 70% of the diversity in planktonic protist communities, but only 33% in benthic communities. There was also little overlap of OTUs between planktonic and benthic communities, as well as between separate benthic communities. We argue that these patterns reflect the heterogeneity and diversity of benthic habitats. A comparison of all OTUs against the Protist Ribosomal Reference database showed that a higher proportion of benthic than planktonic protist diversity is missing from public databases; similar results were obtained by comparing all OTUs against environmental references from NCBI's Short Read Archive. We suggest that the benthic realm may therefore be the world's largest reservoir of marine protist diversity, with most taxa at present undescribed.
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Affiliation(s)
- Dominik Forster
- Department of Ecology, University of Kaiserslautern, Erwin-Schrödinger Str. 14, D-67663 Kaiserslautern, Germany
| | - Micah Dunthorn
- Department of Ecology, University of Kaiserslautern, Erwin-Schrödinger Str. 14, D-67663 Kaiserslautern, Germany
| | - Fréderic Mahé
- Department of Ecology, University of Kaiserslautern, Erwin-Schrödinger Str. 14, D-67663 Kaiserslautern, Germany
| | - John R Dolan
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR CNRS UMR 7093 and Laboratoire d'Océanographie de Villefranche-sur-Mer, Université Paris 06, F-06230 Villefranche-sur-Mer, France
| | - Stéphane Audic
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, 29680 Roscoff, France
| | - David Bass
- Department of Life Sciences, the Natural History Museum London, Cromwell Road, London SW7 5BD, UK Centre for Environment, Fisheries and Aquaculture Science (Cefas), Barrack Road, the Nothe, Weymouth, Dorset DT4 8UB, UK
| | - Lucie Bittner
- Department of Ecology, University of Kaiserslautern, Erwin-Schrödinger Str. 14, D-67663 Kaiserslautern, Germany Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, 29680 Roscoff, France Sorbonne Universités, UPMC, CNRS, Institut de Biologie Paris-Seine (IBPS), Evolution Paris Seine, F-75005 Paris, France
| | - Christophe Boutte
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, 29680 Roscoff, France
| | - Richard Christen
- CNRS, UMR 7138 & Université de Nice-Sophia Antipolis, F-06103 Nice cedex 2, France Université de Nice-Sophia Antipolis & CNRS, UMR 7138 F-06103 Nice cedex 2, France
| | | | - Johan Decelle
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, 29680 Roscoff, France
| | - Bente Edvardsen
- Department of BioSciences, University of Oslo, Blindern, 0316 N-Oslo, Norway
| | - Elianne Egge
- Department of BioSciences, University of Oslo, Blindern, 0316 N-Oslo, Norway
| | - Wenche Eikrem
- Department of BioSciences, University of Oslo, Blindern, 0316 N-Oslo, Norway
| | - Angélique Gobet
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, 29680 Roscoff, France CNRS, UMR 8227 & UPMC Université Paris 06, Station Biologique de Roscoff, F-29682 Roscoff, France
| | | | - Ramiro Logares
- Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta, 37-49, ES-08003, Barcelona, Catalonia, Spain
| | - Ramon Massana
- Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta, 37-49, ES-08003, Barcelona, Catalonia, Spain
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, I-80121, Naples, Italy
| | - Fabrice Not
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, 29680 Roscoff, France
| | - Hiroyuki Ogata
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR CNRS UMR 7093 and Laboratoire d'Océanographie de Villefranche-sur-Mer, Université Paris 06, F-06230 Villefranche-sur-Mer, France Institute for Chemical Research, Kyoto University, Uji, 611-0011, Japan
| | - Jan Pawlowski
- Department of Genetics and Evolution, University of Geneva, 4, Boulevard d'Yvoy, CH-1211 Geneva, Switzerland
| | - Massimo C Pernice
- Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta, 37-49, ES-08003, Barcelona, Catalonia, Spain
| | - Sarah Romac
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, 29680 Roscoff, France
| | | | - Nathalie Simon
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, 29680 Roscoff, France
| | | | - Sébastien Santini
- CNRS, Aix-Marseille Université, IGS UMR7256, F-13288 Marseille, France
| | - Diana Sarno
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, I-80121, Naples, Italy
| | - Raffaele Siano
- Ifremer, Centre de Brest DYNECO/Pelagos Technopôle Brest Iroise, BP 7029280 Plouzané, France
| | - Daniel Vaulot
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, 29680 Roscoff, France
| | | | - Adriana Zingone
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, I-80121, Naples, Italy
| | - Colomban de Vargas
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, UMR 7144, Station Biologique, Place Georges Teissier, 29680 Roscoff, France
| | - Thorsten Stoeck
- Department of Ecology, University of Kaiserslautern, Erwin-Schrödinger Str. 14, D-67663 Kaiserslautern, Germany
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McNamee SE, Medlin LK, Kegel J, McCoy GR, Raine R, Barra L, Ruggiero MV, Kooistra WHCF, Montresor M, Hagstrom J, Blanco EP, Graneli E, Rodríguez F, Escalera L, Reguera B, Dittami S, Edvardsen B, Taylor J, Lewis JM, Pazos Y, Elliott CT, Campbell K. Distribution, occurrence and biotoxin composition of the main shellfish toxin producing microalgae within European waters: A comparison of methods of analysis. Harmful Algae 2016; 55:112-120. [PMID: 28073524 DOI: 10.1016/j.hal.2016.02.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 02/16/2016] [Accepted: 02/16/2016] [Indexed: 06/06/2023]
Abstract
Harmful algal blooms (HABs) are a natural global phenomena emerging in severity and extent. Incidents have many economic, ecological and human health impacts. Monitoring and providing early warning of toxic HABs are critical for protecting public health. Current monitoring programmes include measuring the number of toxic phytoplankton cells in the water and biotoxin levels in shellfish tissue. As these efforts are demanding and labour intensive, methods which improve the efficiency are essential. This study compares the utilisation of a multitoxin surface plasmon resonance (multitoxin SPR) biosensor with enzyme-linked immunosorbent assay (ELISA) and analytical methods such as high performance liquid chromatography with fluorescence detection (HPLC-FLD) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) for toxic HAB monitoring efforts in Europe. Seawater samples (n=256) from European waters, collected 2009-2011, were analysed for biotoxins: saxitoxin and analogues, okadaic acid and dinophysistoxins 1/2 (DTX1/DTX2) and domoic acid responsible for paralytic shellfish poisoning (PSP), diarrheic shellfish poisoning (DSP) and amnesic shellfish poisoning (ASP), respectively. Biotoxins were detected mainly in samples from Spain and Ireland. France and Norway appeared to have the lowest number of toxic samples. Both the multitoxin SPR biosensor and the RNA microarray were more sensitive at detecting toxic HABs than standard light microscopy phytoplankton monitoring. Correlations between each of the detection methods were performed with the overall agreement, based on statistical 2×2 comparison tables, between each testing platform ranging between 32% and 74% for all three toxin families illustrating that one individual testing method may not be an ideal solution. An efficient early warning monitoring system for the detection of toxic HABs could therefore be achieved by combining both the multitoxin SPR biosensor and RNA microarray.
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Affiliation(s)
- Sara E McNamee
- Institute for Global Food Security, School of Biological Sciences, Queen's University, Stranmillis Road, Belfast BT9 5AG, UK
| | - Linda K Medlin
- Marine Biological Association of UK, The Laboratory, Citadel Hill, Plymouth, UK
| | - Jessica Kegel
- Marine Biological Association of UK, The Laboratory, Citadel Hill, Plymouth, UK
| | - Gary R McCoy
- Martin Ryan Institute, National University of Ireland, Galway, Ireland
| | - Robin Raine
- Martin Ryan Institute, National University of Ireland, Galway, Ireland
| | - Lucia Barra
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | | | | | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | - Johannes Hagstrom
- Linnaeus University, Marine Ecology Department, SE-39182 Kalmar, Sweden
| | - Eva Perez Blanco
- Linnaeus University, Marine Ecology Department, SE-39182 Kalmar, Sweden
| | - Edna Graneli
- Linnaeus University, Marine Ecology Department, SE-39182 Kalmar, Sweden
| | - Francisco Rodríguez
- Instituto Español de Oceanografía, Subida a Radio Faro 50, 36390 Vigo, Spain
| | - Laura Escalera
- Instituto Español de Oceanografía, Subida a Radio Faro 50, 36390 Vigo, Spain
| | - Beatriz Reguera
- Instituto Español de Oceanografía, Subida a Radio Faro 50, 36390 Vigo, Spain
| | - Simon Dittami
- University of Oslo, Department of Biosciences, 0316 Oslo, Norway
| | - Bente Edvardsen
- University of Oslo, Department of Biosciences, 0316 Oslo, Norway
| | - Joe Taylor
- Faculty of Science and Technology, University of Westminster, London W1W 6UW, UK
| | - Jane M Lewis
- Faculty of Science and Technology, University of Westminster, London W1W 6UW, UK
| | - Yolanda Pazos
- INTECMAR, Peirao de Vilaxoán, Villagarcía de Arosa 36611, Spain
| | - Christopher T Elliott
- Institute for Global Food Security, School of Biological Sciences, Queen's University, Stranmillis Road, Belfast BT9 5AG, UK
| | - Katrina Campbell
- Institute for Global Food Security, School of Biological Sciences, Queen's University, Stranmillis Road, Belfast BT9 5AG, UK.
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Patil S, Moeys S, von Dassow P, Huysman MJJ, Mapleson D, De Veylder L, Sanges R, Vyverman W, Montresor M, Ferrante MI. Identification of the meiotic toolkit in diatoms and exploration of meiosis-specific SPO11 and RAD51 homologs in the sexual species Pseudo-nitzschia multistriata and Seminavis robusta. BMC Genomics 2015; 16:930. [PMID: 26572248 PMCID: PMC4647503 DOI: 10.1186/s12864-015-1983-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 10/04/2015] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Sexual reproduction is an obligate phase in the life cycle of most eukaryotes. Meiosis varies among organisms, which is reflected by the variability of the gene set associated to the process. Diatoms are unicellular organisms that belong to the stramenopile clade and have unique life cycles that can include a sexual phase. RESULTS The exploration of five diatom genomes and one diatom transcriptome led to the identification of 42 genes potentially involved in meiosis. While these include the majority of known meiosis-related genes, several meiosis-specific genes, including DMC1, could not be identified. Furthermore, phylogenetic analyses supported gene identification and revealed ancestral loss and recent expansion in the RAD51 family in diatoms. The two sexual species Pseudo-nitzschia multistriata and Seminavis robusta were used to explore the expression of meiosis-related genes: RAD21, SPO11-2, RAD51-A, RAD51-B and RAD51-C were upregulated during meiosis, whereas other paralogs in these families showed no differential expression patterns, suggesting that they may play a role during vegetative divisions. An almost identical toolkit is shared among Pseudo-nitzschia multiseries and Fragilariopsis cylindrus, as well as two species for which sex has not been observed, Phaeodactylum tricornutum and Thalassiosira pseudonana, suggesting that these two may retain a facultative sexual phase. CONCLUSIONS Our results reveal the conserved meiotic toolkit in six diatom species and indicate that Stramenopiles share major modifications of canonical meiosis processes ancestral to eukaryotes, with important divergences in each Kingdom.
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Affiliation(s)
- Shrikant Patil
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Naples, Italy.
| | - Sara Moeys
- Department of Biology, Protistology and Aquatic Ecology, Ghent University, 9000, Ghent, Belgium. .,Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), 9052, Ghent, Belgium. .,Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Ghent, Belgium.
| | - Peter von Dassow
- Facultad de Ciencias Biológicas, Instituto Milenio de Oceanografía, Pontificia Universidad Católica de Chile, Santiago, Chile. .,UMI 3614, Evolutionary Biology and Ecology of Algae, CNRS-UPMC Sorbonne Universités, PUCCh, UACH, Station Biologique de Roscoff, Roscoff, France.
| | - Marie J J Huysman
- Department of Biology, Protistology and Aquatic Ecology, Ghent University, 9000, Ghent, Belgium. .,Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), 9052, Ghent, Belgium. .,Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Ghent, Belgium.
| | - Daniel Mapleson
- The Genome Analysis Centre (TGAC), Norwich Research Park, Norwich, NR4 7UH, UK.
| | - Lieven De Veylder
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), 9052, Ghent, Belgium. .,Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052, Ghent, Belgium.
| | - Remo Sanges
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Naples, Italy.
| | - Wim Vyverman
- Department of Biology, Protistology and Aquatic Ecology, Ghent University, 9000, Ghent, Belgium.
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale 1, 80121, Naples, Italy.
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Tesson SVM, Montresor M, Procaccini G, Kooistra WHCF. Temporal changes in population structure of a marine planktonic diatom. PLoS One 2014; 9:e114984. [PMID: 25506926 PMCID: PMC4266644 DOI: 10.1371/journal.pone.0114984] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 11/17/2014] [Indexed: 01/17/2023] Open
Abstract
A prevailing question in phytoplankton research addresses changes of genetic diversity in the face of huge population sizes and apparently unlimited dispersal capabilities. We investigated population genetic structure of the pennate planktonic marine diatom Pseudo-nitzschia multistriata at the LTER station MareChiara in the Gulf of Naples (Italy) over four consecutive years and explored possible changes over seasons and from year to year. A total of 525 strains were genotyped using seven microsatellite markers, for a genotypic diversity of 75.05%, comparable to that found in other Pseudo-nitzschia species. Evidence from Bayesian clustering analysis (BA) identified two genetically distinct clusters, here interpreted as populations, and several strains that could not be assigned with ≥90% probability to either population, here interpreted as putative hybrids. Principal Component Analysis (PCA) recovered these two clusters in distinct clouds with most of the putative hybrids located in-between. Relative proportions of the two populations and the putative hybrids remained similar within years, but changed radically between 2008 and 2009 and between 2010 and 2011, when the 2008-population apparently became the dominant one again. Strains from the two populations are inter-fertile, and so is their offspring. Inclusion of genotypes of parental strains and their offspring shows that the majority of the latter could not be assigned to any of the two parental populations. Therefore, field strains classified by BA as the putative hybrids could be biological hybrids. We hypothesize that P. multistriata population dynamics in the Gulf of Naples follows a meta-population-like model, including establishment of populations by cell inocula at the beginning of each growth season and remixing and dispersal governed by moving and mildly turbulent water masses.
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Affiliation(s)
- Sylvie V. M. Tesson
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy
- * E-mail:
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy
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John U, Litaker RW, Montresor M, Murray S, Brosnahan ML, Anderson DM. Formal revision of the Alexandrium tamarense species complex (Dinophyceae) taxonomy: the introduction of five species with emphasis on molecular-based (rDNA) classification. Protist 2014; 165:779-804. [PMID: 25460230 PMCID: PMC4457362 DOI: 10.1016/j.protis.2014.10.001] [Citation(s) in RCA: 190] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 09/30/2014] [Accepted: 10/02/2014] [Indexed: 11/29/2022]
Abstract
The Alexandrium tamarense species complex is one of the most studied marine dinoflagellate groups due to its ecological, toxicological and economic importance. Several members of this complex produce saxitoxin and its congeners - potent neurotoxins that cause paralytic shellfish poisoning. Isolates from this complex are assigned to A. tamarense, A. fundyense, or A. catenella based on two main morphological characters: the ability to form chains and the presence/absence of a ventral pore between Plates 1' and 4'. However, studies have shown that these characters are not consistent and/or distinctive. Further, phylogenies based on multiple regions in the rDNA operon indicate that the sequences from morphologically indistinguishable isolates partition into five clades. These clades were initially named based on their presumed geographic distribution, but recently were renamed as Groups I-V following the discovery of sympatry among some groups. In this study we present data on morphology, ITS/5.8S genetic distances, ITS2 compensatory base changes, mating incompatibilities, toxicity, the sxtA toxin synthesis gene, and rDNA phylogenies. All results were consistent with each group representing a distinct cryptic species. Accordingly, the groups were assigned species names as follows: Group I, A. fundyense; Group II, A. mediterraneum; Group III, A. tamarense; Group IV, A. pacificum; Group V, A. australiense.
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Affiliation(s)
- Uwe John
- Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany.
| | - R Wayne Litaker
- National Oceanic and Atmospheric Administration, National Ocean Service, National Centers for Coastal Oceans Science, Center for Fisheries and Habitat Research, 101 Pivers Island Road, Beaufort, North Carolina 28516, United States
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | - Shauna Murray
- Plant Functional Biology and Climate Change Cluster, University of Technology Sydney, Sydney, PO Box 123 Broadway, NSW 2007, Australia
| | - Michael L Brosnahan
- Woods Hole Oceanographic Institution, MS # 32, 266 Woods Hole Road, Woods Hole, Massachusetts 02543, United States
| | - Donald M Anderson
- Woods Hole Oceanographic Institution, MS # 32, 266 Woods Hole Road, Woods Hole, Massachusetts 02543, United States
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Scalco E, Stec K, Iudicone D, Ferrante MI, Montresor M. The dynamics of sexual phase in the marine diatom Pseudo-nitzschia multistriata (Bacillariophyceae). J Phycol 2014; 50:817-828. [PMID: 26988637 DOI: 10.1111/jpy.12225] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Accepted: 07/06/2014] [Indexed: 06/05/2023]
Abstract
Sexual reproduction represents a fundamental phase in the life cycle of diatoms, linked to both the production of genotypic diversity and the formation of large-sized initial cells. Only cells below a certain size threshold can be sexualized, but various environmental factors can modulate the success of sexual reproduction. We investigated the role of cell density and physiological conditions of parental strains in affecting the success and timing of sexual reproduction in the marine heterothallic diatom Pseudo-nitzschia multistriata. We also studied the dynamics of the sexual phase in still conditions allowing cell sedimentation and in gently mixed conditions that keep cells in suspension. Our results showed that successful sexual reproduction can only be achieved when crossing parental strains in the exponential growth phase. Evidence was provided for the fact that sexual reproduction is a density-dependent event and requires a threshold cell concentration to start, although this might vary considerably amongst strains. Moreover, the onset of the sexual phase was coupled to a marked reduction in growth of the vegetative parental cells. The crosses carried out in physically mixed conditions produced a significantly reduced number of sexual stages as compared to crosses in still conditions, showing that mixing impairs sexualization. The results of our experiments suggest that the signaling that triggers the sexual phase is favored when cells can accumulate, reducing the distance between them and facilitating contacts and/or the perception of chemical cues. Information on the progression of the sexual phase in laboratory conditions help understanding the conditions at which sex occurs in the natural environment.
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Affiliation(s)
- Eleonora Scalco
- Stazione Zoologica Anton Dohrn, Villa Comunale, Naples, 80121, Italy
| | - Krzysztof Stec
- Stazione Zoologica Anton Dohrn, Villa Comunale, Naples, 80121, Italy
| | - Daniele Iudicone
- Stazione Zoologica Anton Dohrn, Villa Comunale, Naples, 80121, Italy
| | | | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, Naples, 80121, Italy
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Godhe A, Kremp A, Montresor M. Genetic and Microscopic Evidence for Sexual Reproduction in the Centric Diatom Skeletonema marinoi. Protist 2014; 165:401-16. [DOI: 10.1016/j.protis.2014.04.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 04/14/2014] [Accepted: 04/18/2014] [Indexed: 01/23/2023]
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John U, Litaker W, Montresor M, Murray S, Brosnahan ML, Anderson DM. (2302) Proposal to reject the name Gonyaulax catenella ( Alexandrium catenella) ( Dinophyceae). Taxon 2014; 63:932-933. [PMID: 25530637 PMCID: PMC4268871 DOI: 10.12705/634.21] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Affiliation(s)
- Uwe John
- Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Wayne Litaker
- National Oceanic and Atmospheric Administration, National Ocean Service, National Centers for Coastal Oceans Science, Center for Fisheries and Habitat Research, 101 Pivers Island Road, Beaufort, North Carolina 28516, U.S.A
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | - Shauna Murray
- Plant Functional Biology and Climate Change Cluster, University of Technology, Sydney, P.O. Box 123 Broadway, New South Wales 2007, Australia
| | - Michael L. Brosnahan
- Woods Hole Oceanographic Institution, MS # 32, 266 Woods Hole Road, Woods Hole, Massachusetts 02543, U.S.A
| | - Donald M. Anderson
- Woods Hole Oceanographic Institution, MS # 32, 266 Woods Hole Road, Woods Hole, Massachusetts 02543, U.S.A
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Keeling PJ, Burki F, Wilcox HM, Allam B, Allen EE, Amaral-Zettler LA, Armbrust EV, Archibald JM, Bharti AK, Bell CJ, Beszteri B, Bidle KD, Cameron CT, Campbell L, Caron DA, Cattolico RA, Collier JL, Coyne K, Davy SK, Deschamps P, Dyhrman ST, Edvardsen B, Gates RD, Gobler CJ, Greenwood SJ, Guida SM, Jacobi JL, Jakobsen KS, James ER, Jenkins B, John U, Johnson MD, Juhl AR, Kamp A, Katz LA, Kiene R, Kudryavtsev A, Leander BS, Lin S, Lovejoy C, Lynn D, Marchetti A, McManus G, Nedelcu AM, Menden-Deuer S, Miceli C, Mock T, Montresor M, Moran MA, Murray S, Nadathur G, Nagai S, Ngam PB, Palenik B, Pawlowski J, Petroni G, Piganeau G, Posewitz MC, Rengefors K, Romano G, Rumpho ME, Rynearson T, Schilling KB, Schroeder DC, Simpson AGB, Slamovits CH, Smith DR, Smith GJ, Smith SR, Sosik HM, Stief P, Theriot E, Twary SN, Umale PE, Vaulot D, Wawrik B, Wheeler GL, Wilson WH, Xu Y, Zingone A, Worden AZ. The Marine Microbial Eukaryote Transcriptome Sequencing Project (MMETSP): illuminating the functional diversity of eukaryotic life in the oceans through transcriptome sequencing. PLoS Biol 2014; 12:e1001889. [PMID: 24959919 PMCID: PMC4068987 DOI: 10.1371/journal.pbio.1001889] [Citation(s) in RCA: 615] [Impact Index Per Article: 61.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Current sampling of genomic sequence data from eukaryotes is relatively poor, biased, and inadequate to address important questions about their biology, evolution, and ecology; this Community Page describes a resource of 700 transcriptomes from marine microbial eukaryotes to help understand their role in the world's oceans.
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Affiliation(s)
- Patrick J. Keeling
- Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada
- Canadian Institute for Advanced Research, Integrated Microbial Biodiversity program, Canada
- * E-mail: (PJK); (AZW)
| | - Fabien Burki
- Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada
| | - Heather M. Wilcox
- Monterey Bay Aquarium Research Institute, Moss Landing, California, United States of America
| | - Bassem Allam
- School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York, United States of America
| | - Eric E. Allen
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, United States of America
| | - Linda A. Amaral-Zettler
- The Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, Marine Biological Laboratory, Woods Hole, Massachusetts, United States of America
- Department of Geological Sciences, Brown University, Providence, Rhode Island, United States of America
| | - E. Virginia Armbrust
- School of Oceanography, University of Washington, Seattle, Washington, United States of America
| | - John M. Archibald
- Canadian Institute for Advanced Research, Integrated Microbial Biodiversity program, Canada
- Department of Biochemistry & Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Arvind K. Bharti
- National Center for Genome Resources, Santa Fe, New Mexico, United States of America
| | - Callum J. Bell
- National Center for Genome Resources, Santa Fe, New Mexico, United States of America
| | - Bank Beszteri
- Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
| | - Kay D. Bidle
- Institute of Marine and Coastal Science, Rutgers University, New Brunswick, New Jersey, United States of America
| | - Connor T. Cameron
- National Center for Genome Resources, Santa Fe, New Mexico, United States of America
| | - Lisa Campbell
- Department of Oceanography, Department of Biology, Texas A&M University, College Station, Texas, United States of America
| | - David A. Caron
- Department of Biology, University of Southern California, Los Angeles, California, United States of America
| | - Rose Ann Cattolico
- Department of Biology, University of Washington, Seattle, Washington, United States of America
| | - Jackie L. Collier
- School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York, United States of America
| | - Kathryn Coyne
- University of Delaware, School of Marine Science and Policy, College of Earth, Ocean, and Environment, Lewes, Delaware, United States of America
| | - Simon K. Davy
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Phillipe Deschamps
- Unité d'Ecologie, Systematique et Evolution, CNRS UMR8079, Université Paris-Sud, Orsay, France
| | - Sonya T. Dyhrman
- Department of Earth and Environmental Sciences and the Lamont-Doherty Earth Observatory, Columbia University, New York, New York, United States of America
| | | | - Ruth D. Gates
- Hawaii Institute of Marine Biology, University of Hawaii, Hawaii, United States of America
| | - Christopher J. Gobler
- School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York, United States of America
| | - Spencer J. Greenwood
- Department of Biomedical Sciences and AVC Lobster Science Centre, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Stephanie M. Guida
- National Center for Genome Resources, Santa Fe, New Mexico, United States of America
| | - Jennifer L. Jacobi
- National Center for Genome Resources, Santa Fe, New Mexico, United States of America
| | | | - Erick R. James
- Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada
| | - Bethany Jenkins
- Department of Cell and Molecular Biology, The University of Rhode Island, Kingston, Rhode Island, United States of America
- Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island, United States of America
| | - Uwe John
- Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany
| | - Matthew D. Johnson
- Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, United States of America
| | - Andrew R. Juhl
- Department of Earth and Environmental Sciences and the Lamont-Doherty Earth Observatory, Columbia University, New York, New York, United States of America
| | - Anja Kamp
- Max Planck Institute for Marine Microbiology, Bremen, Germany
- Jacobs University Bremen, Molecular Life Science Research Center, Bremen, Germany
| | - Laura A. Katz
- Department of Biological Sciences, Smith College, Northampton, Massachusetts, United States of America
| | - Ronald Kiene
- University of South Alabama, Dauphin Island Sea Lab, Mobile, Alabama, United States of America
| | - Alexander Kudryavtsev
- Department of Invertebrate Zoology, Saint-Petersburg State University, Saint-Petersburg, Russia
- Department of Genetics and Evolution, University of Geneva, Geneva, Switzerland
| | - Brian S. Leander
- Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada
| | - Senjie Lin
- Department of Marine Sciences, University of Connecticut, Groton, Connecticut, United States of America
| | - Connie Lovejoy
- Département de Biologie, Université Laval, Québec, Canada
| | - Denis Lynn
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada
- Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Adrian Marchetti
- Department of Marine Sciences, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | - George McManus
- Department of Marine Sciences, University of Connecticut, Groton, Connecticut, United States of America
| | - Aurora M. Nedelcu
- University of New Brunswick, Department of Biology, Fredericton, New Brusnswick, Canada
| | - Susanne Menden-Deuer
- Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island, United States of America
| | - Cristina Miceli
- School of Biosciences and Biotechnology, University of Camerino, Camerino, Italy
| | - Thomas Mock
- School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom
| | | | - Mary Ann Moran
- Department of Marine Sciences, University of Georgia, Athens, Georgia, United States of America
| | - Shauna Murray
- Plant Functional Biology and Climate Change Cluster (C3), University of Technology, Sydney, Australia
| | - Govind Nadathur
- Department of Marine Sciences, University of Puerto Rico, Mayaguez, Puerto Rico, United States of America
| | - Satoshi Nagai
- National Research Institute of Fisheries Science, Kanagawa, Japan
| | - Peter B. Ngam
- National Center for Genome Resources, Santa Fe, New Mexico, United States of America
| | - Brian Palenik
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, United States of America
| | - Jan Pawlowski
- Department of Genetics and Evolution, University of Geneva, Geneva, Switzerland
| | | | - Gwenael Piganeau
- CNRS, UMR 7232, BIOM, Observatoire Océanologique, Banyuls-sur-Mer, France
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7232, BIOM, Banyuls-sur-Mer, France
| | - Matthew C. Posewitz
- Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, Colorado, United States of America
| | | | | | - Mary E. Rumpho
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut, United States of America
| | - Tatiana Rynearson
- Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island, United States of America
| | - Kelly B. Schilling
- National Center for Genome Resources, Santa Fe, New Mexico, United States of America
| | - Declan C. Schroeder
- The Marine Biological Association of the United Kingdom, Plymouth, United Kingdom
| | - Alastair G. B. Simpson
- Canadian Institute for Advanced Research, Integrated Microbial Biodiversity program, Canada
- Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Claudio H. Slamovits
- Canadian Institute for Advanced Research, Integrated Microbial Biodiversity program, Canada
- Department of Biochemistry & Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
| | | | - G. Jason Smith
- Moss Landing Marine Laboratories, Moss Landing, California, United States of America
| | - Sarah R. Smith
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, United States of America
| | - Heidi M. Sosik
- Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, United States of America
| | - Peter Stief
- Max Planck Institute for Marine Microbiology, Bremen, Germany
| | - Edward Theriot
- Section of Integrative Biology, University of Texas, Austin, Texas, United States of America
| | - Scott N. Twary
- Los Alamos National Laboratory, Biosciences, Los Alamos, New Mexico, United States of America
| | - Pooja E. Umale
- National Center for Genome Resources, Santa Fe, New Mexico, United States of America
| | - Daniel Vaulot
- UMR714, CNRS and UPMC (Paris-06), Station Biologique, Roscoff, France
| | - Boris Wawrik
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, Oklahoma, United States of America
| | - Glen L. Wheeler
- The Marine Biological Association of the United Kingdom, Plymouth, United Kingdom
- Plymouth Marine Laboratory, Plymouth, United Kingdom
| | - William H. Wilson
- NCMA, Bigelow Laboratory for Ocean Sciences, East Boothbay, Maine, United States of America
| | - Yan Xu
- Princeton University, Princeton, New Jersey, United States of America
| | | | - Alexandra Z. Worden
- Canadian Institute for Advanced Research, Integrated Microbial Biodiversity program, Canada
- Monterey Bay Aquarium Research Institute, Moss Landing, California, United States of America
- * E-mail: (PJK); (AZW)
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Escalera L, Benvenuto G, Scalco E, Zingone A, Montresor M. Ultrastructural features of the benthic dinoflagellate Ostreopsis cf. ovata (Dinophyceae). Protist 2014; 165:260-74. [PMID: 24742926 DOI: 10.1016/j.protis.2014.03.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 02/07/2014] [Accepted: 03/05/2014] [Indexed: 11/20/2022]
Abstract
The toxic benthic dinoflagellate Ostreopsis cf. ovata has considerably expanded its distribution range in the last decade, posing risks to human health. Several aspects of this species are still poorly known. We studied ultrastructural features of cultivated and natural populations of Ostreopsis cf. ovata from the Gulf of Naples (Mediterranean Sea) using confocal laser scanning, and scanning and transmission electron microscopy. New information on the morphology and location of several sulcal plates was gained and a new plate designation is suggested that better fits the one applied to other Gonyaulacales. The microtubular component of the cytoskeleton, revealed using an anti-β-tubulin antibody, consisted of a cortical layer of microtubules arranged asymmetrically in the episome and in the hyposome, complemented by a complex inner microtubular system running from the sulcal area towards the internal part of the cell. The conspicuous canal was delimited by two thick, burin-shaped lobes ending in a tubular ventral opening. The canal was surrounded by mucocysts discharging their content into it. A similar structure has been reported in other benthic and planktonic dinoflagellates and may be interpreted as an example of convergent evolution in species producing large amounts of mucus.
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Affiliation(s)
- Laura Escalera
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy.
| | | | - Eleonora Scalco
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | - Adriana Zingone
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
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Barra L, Ruggiero MV, Sarno D, Montresor M, Kooistra WHCF. Strengths and weaknesses of microarray approaches to detect Pseudo-nitzschia species in the field. Environ Sci Pollut Res Int 2013; 20:6705-6718. [PMID: 24065245 DOI: 10.1007/s11356-012-1330-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 11/12/2012] [Indexed: 06/02/2023]
Abstract
The planktonic diatom genus Pseudo-nitzschia contains several genetically closely related species. Some of these can produce domoic acid, a potent neurotoxin. Thus, monitoring programs are needed to screen for the presence of these toxic species. Unfortunately, many are impossible to distinguish using light microscopy. Therefore, we assessed the applicability of microarray technology for detection of toxic and non-toxic Pseudo-nitzschia species in the Gulf of Naples (Mediterranean Sea). Here, 11 species have been detected, of which at least 5 are potentially toxic. A total of 49 genus- and species-specific DNA probes were designed in silico against the nuclear LSU and SSU rRNA of 19 species, and spotted on the microarray. The microarray was tested against total RNA of monoclonal cultures of eight species. Only three of the probes designed to be species-specific were indeed so within the limits of our experimental design. To assess the effectiveness of the microarray in detecting Pseudo-nitzschia species in environmental samples, we hybridized total RNA extracted from 11 seasonal plankton samples against microarray slides and compared the observed pattern with plankton counts in light microscopy and with expected hybridization patterns obtained with monoclonal cultures of the observed species. Presence of species in field samples generally resulted in signal patterns on the microarray as observed with RNA extracted from cultures of these species, but many a-specific signals appeared as well. Possible reasons for the numerous cross reactions are discussed. Calibration curves for Pseudo-nitzschia multistriata showed linear relationship between signal strength and cell number.
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Affiliation(s)
- Lucia Barra
- Laboratory of Ecology and Evolution of Plankton, Stazione Zoologica Anton Dohrn, Villa Comunale I, 80121, Naples, Italy
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Lamari N, Ruggiero MV, d’Ippolito G, Kooistra WHCF, Fontana A, Montresor M. Specificity of lipoxygenase pathways supports species delineation in the marine diatom genus Pseudo-nitzschia. PLoS One 2013; 8:e73281. [PMID: 24014077 PMCID: PMC3754938 DOI: 10.1371/journal.pone.0073281] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Accepted: 07/18/2013] [Indexed: 01/08/2023] Open
Abstract
Oxylipins are low-molecular weight secondary metabolites derived from the incorporation of oxygen into the carbon chains of polyunsaturated fatty acids (PUFAs). Oxylipins are produced in many prokaryotic and eukaryotic lineages where they are involved in a broad spectrum of actions spanning from stress and defense responses, regulation of growth and development, signaling, and innate immunity. We explored the diversity in oxylipin patterns in the marine planktonic diatom Pseudo-nitzschia. This genus includes several species only distinguishable with the aid of molecular markers. Oxylipin profiles of cultured strains were obtained by reverse phase column on a liquid chromatograph equipped with UV photodiode detector and q-ToF mass spectrometer. Lipoxygenase compounds were mapped on phylogenies of the genus Pseudo-nitzschia inferred from the nuclear encoded hyper-variable region of the LSU rDNA and the plastid encoded rbcL. Results showed that the genus Pseudo-nitzschia exhibits a rich and varied lipoxygenase metabolism of eicosapentaenoic acid (EPA), with a high level of specificity for oxylipin markers that generally corroborated the genotypic delineation, even among genetically closely related cryptic species. These results suggest that oxylipin profiles constitute additional identification tools for Pseudo-nitzschia species providing a functional support to species delineation obtained with molecular markers and morphological traits. The exploration of the diversity, patterns and plasticity of oxylipin production across diatom species and genera will also provide insights on the ecological functions of these secondary metabolites and on the selective pressures driving their diversification.
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Affiliation(s)
- Nadia Lamari
- Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, Pozzuoli, Italy
| | - Maria Valeria Ruggiero
- Laboratory of Ecology and Evolution of Plankton, Stazione Zoologica Anton Dohrn, Napoli, Italy
- * E-mail:
| | - Giuliana d’Ippolito
- Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, Pozzuoli, Italy
| | - Wiebe H. C. F. Kooistra
- Laboratory of Ecology and Evolution of Plankton, Stazione Zoologica Anton Dohrn, Napoli, Italy
| | - Angelo Fontana
- Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, Pozzuoli, Italy
| | - Marina Montresor
- Laboratory of Ecology and Evolution of Plankton, Stazione Zoologica Anton Dohrn, Napoli, Italy
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Guillou L, Bachar D, Audic S, Bass D, Berney C, Bittner L, Boutte C, Burgaud G, de Vargas C, Decelle J, Del Campo J, Dolan JR, Dunthorn M, Edvardsen B, Holzmann M, Kooistra WHCF, Lara E, Le Bescot N, Logares R, Mahé F, Massana R, Montresor M, Morard R, Not F, Pawlowski J, Probert I, Sauvadet AL, Siano R, Stoeck T, Vaulot D, Zimmermann P, Christen R. The Protist Ribosomal Reference database (PR2): a catalog of unicellular eukaryote small sub-unit rRNA sequences with curated taxonomy. Nucleic Acids Res 2012. [PMID: 23193267 PMCID: PMC3531120 DOI: 10.1093/nar/gks1160] [Citation(s) in RCA: 863] [Impact Index Per Article: 71.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The interrogation of genetic markers in environmental meta-barcoding studies is currently seriously hindered by the lack of taxonomically curated reference data sets for the targeted genes. The Protist Ribosomal Reference database (PR2, http://ssu-rrna.org/) provides a unique access to eukaryotic small sub-unit (SSU) ribosomal RNA and DNA sequences, with curated taxonomy. The database mainly consists of nuclear-encoded protistan sequences. However, metazoans, land plants, macrosporic fungi and eukaryotic organelles (mitochondrion, plastid and others) are also included because they are useful for the analysis of high-troughput sequencing data sets. Introns and putative chimeric sequences have been also carefully checked. Taxonomic assignation of sequences consists of eight unique taxonomic fields. In total, 136 866 sequences are nuclear encoded, 45 708 (36 501 mitochondrial and 9657 chloroplastic) are from organelles, the remaining being putative chimeric sequences. The website allows the users to download sequences from the entire and partial databases (including representative sequences after clustering at a given level of similarity). Different web tools also allow searches by sequence similarity. The presence of both rRNA and rDNA sequences, taking into account introns (crucial for eukaryotic sequences), a normalized eight terms ranked-taxonomy and updates of new GenBank releases were made possible by a long-term collaboration between experts in taxonomy and computer scientists.
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Affiliation(s)
- Laure Guillou
- CNRS, UMR 7144, Adaptation et Diversité en Milieu Marin, 29682 Roscoff, France.
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Anderson DM, Alpermann TJ, Cembella AD, Collos Y, Masseret E, Montresor M. The globally distributed genus Alexandrium: multifaceted roles in marine ecosystems and impacts on human health. Harmful Algae 2012; 14:10-35. [PMID: 22308102 PMCID: PMC3269821 DOI: 10.1016/j.hal.2011.10.012] [Citation(s) in RCA: 354] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The dinoflagellate genus Alexandrium is one of the major harmful algal bloom (HAB) genera with respect to the diversity, magnitude and consequences of blooms. The ability of Alexandrium to colonize multiple habitats and to persist over large regions through time is testimony to the adaptability and resilience of this group of species. Three different families of toxins, as well as an as yet incompletely characterized suite of allelochemicals are produced among Alexandrium species. Nutritional strategies are equally diverse, including the ability to utilize a range of inorganic and organic nutrient sources, and feeding by ingestion of other organisms. Many Alexandrium species have complex life histories that include sexuality and often, but not always, cyst formation, which is characteristic of a meroplanktonic life strategy and offers considerable ecological advantages. Due to the public health and ecosystem impacts of Alexandrium blooms, the genus has been extensively studied, and there exists a broad knowledge base that ranges from taxonomy and phylogeny through genomics and toxin biosynthesis to bloom dynamics and modeling. Here we present a review of the genus Alexandrium, focusing on the major toxic and otherwise harmful species.
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Affiliation(s)
- Donald M Anderson
- Woods Hole Oceanographic Institution, MS # 32, 266 Woods Hole Road, Woods Hole MA 02543; 508 289 2351
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Zamò A, Bertolaso A, van Raaij AWM, Mancini F, Scardoni M, Montresor M, Menestrina F, van Krieken JHJM, Chilosi M, Groenen PJTA, Scarpa A. Application of microfluidic technology to the BIOMED-2 protocol for detection of B-cell clonality. J Mol Diagn 2011; 14:30-7. [PMID: 22026958 DOI: 10.1016/j.jmoldx.2011.07.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Revised: 07/18/2011] [Accepted: 07/22/2011] [Indexed: 11/30/2022] Open
Abstract
The BIOMED-2 protocol is widely used for detecting clonality in lymphoproliferative disorders. The protocol requires multiple PCR reactions, which are analyzed by either capillary electrophoresis (GeneScan analysis) or heteroduplex PAGE analysis. We tested a microfluidic chip-based electrophoresis device (Agilent 2100 Bioanalyzer) for the analysis of B-cell clonality using PCR for the three framework subregions (FR) of the Ig heavy chain gene (IGH) and PCR for two rearrangements occurring in the Ig κ chain gene (IGK-VJ and IGK-DE). We analyzed 62 B-cell lymphomas (33 follicular and 29 nonfollicular) and 16 reactive lymph nodes. Chip-based electrophoresis was conclusive for monoclonality in 59/62 samples; for 20 samples, it was compared with GeneScan analysis. Concordant results were obtained in 45/55 IGH (FR1, FR2, and FR3) gene rearrangements, and in 34/37 IGK gene rearrangements. However, when the chip device was used to analyze selected IGK gene rearrangements (biallelic IGK rearrangements or IGK rearrangements in a polyclonal background), its performance was not completely accurate. We conclude, therefore, that this microfluidic chip-based electrophoresis device is reliable for testing cases with dominant PCR products but is less sensitive than GeneScan in detecting clonal peaks in a polyclonal background for IGH PCR, or with complex IGK rearrangement patterns.
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Affiliation(s)
- Alberto Zamò
- Department of Pathology and Diagnostics, Section of Anatomic Pathology, University of Verona, Verona, Italy.
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D'Ippolito G, Lamari N, Montresor M, Romano G, Cutignano A, Gerecht A, Cimino G, Fontana A. 15S-lipoxygenase metabolism in the marine diatom Pseudo-nitzschia delicatissima. New Phytol 2009; 183:1064-1071. [PMID: 19538551 DOI: 10.1111/j.1469-8137.2009.02887.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In recent years, oxylipins (lipoxygenase-derived oxygenated fatty acid products) have been reported in several bloom-forming marine diatoms. Despite increasing attention on the ecophysiological role of these molecules in marine environments, their biosynthesis is largely unknown in these microalgae. Biochemical methods, including tandem mass spectrometry, nuclear magnetic resonance and radioactive probes were used to identify structures, enzymatic activities and growth-dependent modulation of oxylipin biosynthesis in the pennate diatom Pseudo-nitzschia delicatissima. Three major compounds, 15S-hydroxy-(5Z,8Z,11Z,13E,17Z)-eicosapentaenoic acid (15S-HEPE), 15-oxo-5Z,9E,11E,13E-pentadecatetraenoic acid and 13,14-threo-13R-hydroxy-14S,15S-trans-epoxyeicosa-5Z,8Z,11Z,17Z-tetraenoic acid (13,14-HEpETE), were produced by three putative biochemical pathways triggered by eicosapentaenoic acid-dependent 15S lipoxygenase. Oxylipin production increases along the growth curve, with remarkable changes that precede the demise of the culture. At least one of the compounds, namely 15-oxoacid, is formed only in the stationary phase immediately before the collapse of the culture. Synthesis and regulation of phyco-oxylipins seem to correspond to a signaling mechanism that governs adaptation of diatoms along the growth curve until bloom termination. Factors triggering the process are unknown but synthesis of 15-oxoacid, constrained within a time-window of a few days just before the collapse of the culture, implies the involvement of a physiological control not directly dependent on distress or death of diatom cells.
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Affiliation(s)
- Giuliana D'Ippolito
- CNR-Istituto di Chimica Biomolecolare, Via Campi Flegrei 34, I-80078 Pozzuoli - Napoli, Italy
| | - Nadia Lamari
- CNR-Istituto di Chimica Biomolecolare, Via Campi Flegrei 34, I-80078 Pozzuoli - Napoli, Italy
| | - Marina Montresor
- Phytoplankton Ecology and Evolution, Stazione Zoologica Anton Dohrn, Villa Comunale I-80121 Napoli, Italy
| | - Giovanna Romano
- Functional and Evolutionary Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, I-80121 Napoli, Italy
| | - Adele Cutignano
- CNR-Istituto di Chimica Biomolecolare, Via Campi Flegrei 34, I-80078 Pozzuoli - Napoli, Italy
| | - Andrea Gerecht
- Functional and Evolutionary Ecology, Stazione Zoologica Anton Dohrn, Villa Comunale, I-80121 Napoli, Italy
| | - Guido Cimino
- CNR-Istituto di Chimica Biomolecolare, Via Campi Flegrei 34, I-80078 Pozzuoli - Napoli, Italy
| | - Angelo Fontana
- CNR-Istituto di Chimica Biomolecolare, Via Campi Flegrei 34, I-80078 Pozzuoli - Napoli, Italy
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D’Alelio D, Amato A, Kooistra WH, Procaccini G, Casotti R, Montresor M. Internal Transcribed Spacer Polymorphism in Pseudo-nitzschia multistriata (Bacillariophyceae) in the Gulf of Naples: Recent Divergence or Intraspecific Hybridization? Protist 2009; 160:9-20. [DOI: 10.1016/j.protis.2008.07.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2008] [Accepted: 07/06/2008] [Indexed: 11/26/2022]
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Assmy P, Hernández-Becerril DU, Montresor M. MORPHOLOGICAL VARIABILITY AND LIFE CYCLE TRAITS OF THE TYPE SPECIES OF THE DIATOM GENUS CHAETOCEROS, C. DICHAETA(1). J Phycol 2008; 44:152-163. [PMID: 27041052 DOI: 10.1111/j.1529-8817.2007.00430.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Chaetoceros dichaeta Ehrenb. is the type species of the genus Chaetoceros and is one of the dominant planktonic diatom species of the Southern Ocean. A number of varieties and forms have been described for C. dichaeta, which prompted us to investigate the morphological variability in clonal cultures to achieve a better circumscription of the morphological features of this species. We studied eight clonal cultures obtained from the type locality by sequencing the D1-D3 hypervariable domains of the LSU to assess their genetic identity, following cell-size reduction and sexual reproduction, and examining the morphological features of cells at different stages of the size reduction process using both LM and EM. Observation of sexual reproduction within clonal strains demonstrated that C. dichaeta is homothallic. The size and morphology of the cells vary considerably during size reduction: cell volume is reduced by over an order of magnitude, and the gradual diminution of the apical axis is accompanied by the elongation of the pervalvar axis. All forms and varieties described for C. dichaeta can be ascribed to the species, with the exception of C. dichaeta f. tenuiformis L. Mangin.
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Affiliation(s)
- Philipp Assmy
- Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, GermanyInstituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Apdo. postal 70-305, México, D.F. 04510, MexicoStazione Zoologica "A. Dohrn," Villa Comunale, 80121 Napoli, Italy
| | - David U Hernández-Becerril
- Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, GermanyInstituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Apdo. postal 70-305, México, D.F. 04510, MexicoStazione Zoologica "A. Dohrn," Villa Comunale, 80121 Napoli, Italy
| | - Marina Montresor
- Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, GermanyInstituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Apdo. postal 70-305, México, D.F. 04510, MexicoStazione Zoologica "A. Dohrn," Villa Comunale, 80121 Napoli, Italy
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Levialdi Ghiron JH, Amato A, Montresor M, Kooistra WHCF. Plastid Inheritance in the Planktonic Raphid Pennate Diatom Pseudo-nitzschia delicatissima (Bacillariophyceae). Protist 2008; 159:91-8. [PMID: 17681490 DOI: 10.1016/j.protis.2007.06.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2007] [Accepted: 06/17/2007] [Indexed: 10/23/2022]
Abstract
Plastid inheritance was followed during sexual reproduction in the raphid pennate diatom Pseudo-nitzschia delicatissima, using rbcL haplotypes as plastid identification tools. Pseudo-nitzschia species are dioecious and show functional anisogamy with 'male' mating type+(PNd(+)) cells and 'female' PNd(-) cells. Vegetative cells possess two plastids. In P. delicatissima, meiosis results in two gametes that both contribute two plastids to the zygote. The latter initially contains four plastids, but during auxospore development two of these four seem to disappear, and the initial cell emerging from the auxospore appears to contain only two. Here we assessed if the plastids are inherited strictly unipaternally, strictly biparentally, or randomly. We traced the source of the plastids in the F(1) generation by using PNd(+) and PNd(-) parental strains with different rbcL genotypes, here denoted AA (homoplastidial, with two plastids of rbcL haplotype A) and BB (homoplastidial; two plastids of haplotype B). Results showed that 16 out of 96 strains raised each from single F(1) cells had retained two paternal (PNd(+)) plastids, 20 had two maternal (PNd(-)) plastids and the remaining 60 had one maternal and one paternal plastid. This pattern is in accordance with the hypothesis that either two of the four plastids are eliminated during auxospore formation, or that all plastids are retained in the auxospore and segregate in pairs joining at random during the first mitotic division of the initial cell. Heteroplastidic F(1)-strains retained the AB genotype throughout the vegetative phase of their life cycle. The finding that 60 out of 96 F(1) strains were heteroplastidial contrasts with an absence of such genotypes in our strains raised from single cells sampled in the Gulf of Naples.
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Amato A, Kooistra WHCF, Ghiron JHL, Mann DG, Pröschold T, Montresor M. Reproductive isolation among sympatric cryptic species in marine diatoms. Protist 2006; 158:193-207. [PMID: 17145201 DOI: 10.1016/j.protis.2006.10.001] [Citation(s) in RCA: 204] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2006] [Accepted: 10/01/2006] [Indexed: 11/22/2022]
Abstract
Pseudo-nitzschia is a marine cosmopolitan genus of chain-forming planktonic diatoms. As for the vast majority of phytoplankton organisms, species identification within this genus mostly relies upon morphological features. Taxa were initially identified based on cell shape and gross morphology of their composite silica cell wall, called the frustule. Yet, observations of the frustule in electron microscopy showed many additional characters for species identification and results of molecular studies have demonstrated that genetically distinct groups might exist within morpho-species. However, these studies have not addressed the biological meaning of these genetic differences. Here, we bridge that gap by comparing ultrastructural features and sequence data (three ribosomal and one plastid marker) of 95 strains with results of mating experiments among these strains. Experiments were performed on two morphologically distinct entities: P. delicatissima and P. pseudodelicatissima. Each of the two entities consisted of multiple genetically distinct and reproductively isolated taxa, all occurring in sympatry: P. delicatissima was composed of three phylogenetic and reproductively distinct groups, whereas P. pseudodelicatissima consisted of up to five. Once these taxa had been defined both genetically and biologically, subtle ultrastructural differences could be detected as well. Our findings not only show that cryptic genetic variants abound in sympatry, but also that they are reproductively isolated and, therefore, biologically distinct units.
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Affiliation(s)
- Alberto Amato
- Stazione Zoologica A. Dohrn, Villa Comunale, 80121 Napoli, Italy.
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Rigaud G, Moore PS, Taruscio D, Scardoni M, Montresor M, Menestrina F, Scarpa A. Alteration of chromosome arm 6p is characteristic of primary mediastinal B-cell lymphoma, as identified by genome-wide allelotyping. Genes Chromosomes Cancer 2001; 31:191-5. [PMID: 11319807 DOI: 10.1002/gcc.1133] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Five cases of primary mediastinal B-cell lymphoma (PMBL) each have been studied with 375 microsatellite markers from all 22 autosomes. Of the 151 genomic alterations among the 1,875 assays, only five were allelic losses. The remainder of the microsatellite alterations consisted of 114 allelic imbalances and 32 instabilities. Microsatellite alterations were found in all cases on chromosomal arms 6p and 9p. These allelic imbalances most likely are indicative of genetic amplification, a finding agreeing well with those of studies using either comparative genomic hybridization or arbitrarily primed polymerase chain reaction, in which amplification of chromosome arm 9p in PMBL has been found. The allelic imbalances on chromosome arm 6p always included marker D6S276 located at 6p21.3-p22.3, where the MHC class I genes reside. These allelic imbalances may be reflective of alterations in the expression of the MHC gene products, characteristic of PMBL. Allelic anomalies close to the MYB gene locus on 6q were detected in two cases and prompted the analysis of MYB rearrangements in a series of 30 lymphomas. One rearrangement was detected in one of 18 cases of PMBL and in none of 10 diffuse, large B-cell lymphomas and two T-cell lymphomas. Our genome-wide microsatellite analysis provides independent confirmation that PMBL is characterized by infrequent chromosomal losses and by frequent genetic alterations involving chromosomal arm 9p. For the first time, chromosomal arm 6p has been identified as a highly frequent target of genetic alterations in this tumor type. Finally, MYB may also be involved occasionally in PMBL pathogenesis.
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Affiliation(s)
- G Rigaud
- Dipartimento di Patologia, Sezione di Anatomia Patologica, Università di Verona, Strada Le Grazie, Verona, Italy
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