Consulta: creatorFacets:"Briand, Enora"
Registros recuperados: 9
Data/hora: 01/06/2024 01:10:44

Cross talk: Two way allelopathic interactions between toxic Microcystis and Daphnia
Provedor de dados: 5
Autores: Bojadzija Savic, Gorenka; Bormans, Myriam; Edwards, Christine; Lawton, Linda; Briand, Enora; Wiegand, Claudia.
Due to eutrophication, freshwater ecosystems frequently experience cyanobacterial blooms, many of which produce bioactive metabolites that can affect vertebrates and invertebrates life traits. Zooplankton are able to develop tolerance as a physiological response to cyanobacteria and their bioactive compounds, however, this comes with energetic cost that in turn influence Daphnia life traits and may impair populations. Vice versa, it has been suggested that Daphnia are able to reduce cyanobacterial dominance until a certain cyanobacterial density; it remains unclear whether Daphnia metabolites alone influence the physiological state and bioactive metabolites production of cyanobacteria. Hence, this study investigates mutual physiological reactions of toxic...
Tipo: Text
Palavras-chave: Zooplankton; Cyanobacteria; Secondary metabolites; PCC7806; Toxic; Oxidative stress.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00624/73653/76105.pdf

Chemically mediated interactions between Microcystis and Planktothrix: Impact on their physiology and metabolic profiles
Provedor de dados: 5
Autores: Briand, Enora; Reubrech, Sébastien; Mondeguer, Florence; Sibat, Manoella; Hess, Philipp; Amzil, Zouher; Bormans, Myriam.
Freshwater cyanobacteria are well known for their ability to produce a wide variety of bioactive compounds, some of which have been described as allelochemicals. There is growing evidence that these secondary metabolites play an important role in shaping community composition through biotic interactions; however, for the most part, their biological role and mode of regulation of the production are poorly understood. In temperate eutrophic freshwaters, Microcystis and Planktothrix often co-occur, with Planktothrix being an early colonizer and Microcystis appearing subsequently. We tested if the production of a range of peptides by co-existing species could be regulated through interspecific interactions. Using a combined approach of co-cultures and analyses...
Tipo: Text
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00374/48515/48794.pdf

Unique Biosynthetic Pathway in Bloom-Forming Cyanobacterial Genus Microcystis Jointly Assembles Cytotoxic Aeruginoguanidines and Microguanidines
Provedor de dados: 5
Autores: Pancrace, Claire; Ishida, Keishi; Briand, Enora; Pichi, Douglas Gatte; Weiz, Annika R.; Guljarnow, Arthur; Scalvenzi, Thibault; Sassoon, Nathalie; Hertweck, Christian; Dittmann, Elke; Gugger, Muriel.
The cyanobacterial genus Microcystis is known to produce an elaborate array of structurally unique and biologically active natural products, including hazardous cyanotoxins. Cytotoxic aeruginoguanidines represent a yet unexplored family of peptides featuring a trisubstituted benzene unit and farnesylated arginine derivatives. In this study, we aimed at assigning these compounds to a biosynthetic gene cluster by utilizing biosynthetic attributes deduced from public genomes of Microcystis and the sporadic distribution of the metabolite in axenic strains of the Pasteur Culture Collection of Cyanobacteria. By integrating genome mining with untargeted metabolomics using liquid chromatography with mass spectrometry, we linked aeruginoguanidine (AGD) to a...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00481/59277/62216.pdf

Preliminary metabolomic approach on cyanobacterial co-cultures: Chemically mediated interactions between Microcystis and Planktothrix
Provedor de dados: 5
Autores: Mondeguer, Florence; Sibat, Manoella; Reubrecht, Sébastien; Amzil, Zouher; Bormans, Myriam; Hess, Philipp; Briand, Enora.
Cyanobacterial proliferation is one of the most harmful hazards, in both freshwater and marine ecosystems. Cyanobacteria are well known for their ability to produce a wide variety of bioactive compounds, some of which have been described as allelochemicals. There is growing evidence that these secondary metabolites play an important role in shaping community composition through biotic interactions; however, for the most part, their biological role and mode of regulation of the production are poorly understood. In temperate eutrophic freshwaters, Microcystis and Planktothrix often co-occur, with Planktothrix being an early colonizer and Microcystis appearing subsequently. By integrating LC-MS/MS molecular networking and an innovative experimental design, we...
Tipo: Text
Palavras-chave: Cyanobacteria; Cyanotoxins; Plankton interactions; Co_culture; LC_HRMS; Molecular Network; Metabolomics.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00405/51666/52215.pdf

Chemically mediated interactions between   Microcystis   and   Planktothrix   : impact on their growth, morphology and metabolic profiles
Provedor de dados: 5
Autores: Briand, Enora; Reubrecht, Sébastien; Mondeguer, Florence; Sibat, Manoella; Hess, Philipp; Amzil, Zouher; Bormans, Myriam.
Freshwater cyanobacteria are known for their ability to produce bioactive compounds, some of which have been described as allelochemicals. Using a combined approach of co‐cultures and analyses of metabolic profiles, we investigated chemically mediated interactions between two cyanobacterial strains, Microcystis aeruginosa PCC7806 and Planktothrix agardhii PCC7805. More precisely, we evaluated changes in growth, morphology and metabolite production and release by both interacting species. Co‐culture of Microcystis with Planktothrix resulted in a reduction of the growth of Planktothrix together with a decrease of its trichome size and alterations in the morphology of its cells. The production of intracellular compounds by Planktothrix showed a slight...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00470/58152/60632.pdf

A community perspective on the concept of marine holobionts: state-of-the-art, challenges, and future directions
Provedor de dados: 5
Autores: Dittami, Simon M; Arboleda, Enrique; Auguet, Jean-christophe; Bigalke, Arite; Briand, Enora; Cardenas, Paco; Cardini, Ulisse; Decelle, Johan; Engelen, Aschwin; Eveillard, Damien; Gachon, Claire Mm; Griffiths, Sarah; Harder, Tilmann; Kayal, Ehsan; Kazamia, Elena; Lallier, François H; Media, Monica; Marzinelli, Ezequiel M; Morganti, Teresa; Nunez Pons, Laura; Prado, Soizik; Pintado, José; Saha, Mahasweta; Selosse, Marc-andré; Skillings, Derek; Stock, Willem; Sunagawa, Shinichi; Toulza, Eve; Vorobev, Alexey; Leblanc, Catherine; Not, Fabrice.
Host-microbe interactions play crucial roles in marine ecosystems, but we still have very little understanding of the mechanisms that govern these relationships, the evolutionary processes that shape them, and their ecological consequences. The holobiont concept is a renewed paradigm in biology that can help describe and understand these complex systems. It posits that a host and its associated microbiota, living together in a long-lasting relationship, form the holobiont, and have to be studied together, as a coherent biological and functional unit, in order to understand the biology, ecology and evolution of the organisms. Here we discuss critical concepts and opportunities in marine holobiont research and identify key challenges in the field. We...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00480/59209/61904.pdf

Daphnia magna Exudates Impact Physiological and Metabolic Changes in Microcystis aeruginosa
Provedor de dados: 5
Autores: Bojadzija Savic, Gorenka; Edwards, Christine; Briand, Enora; Lawton, Linda; Wiegand, Claudia; Bormans, Myriam.
While the intracellular function of many toxic and bioactive cyanobacterial metabolites is not yet known, microcystins have been suggested to have a protective role in the cyanobacterial metabolism, giving advantage to toxic over nontoxic strains under stress conditions. The zooplankton grazer Daphnia reduce cyanobacterial dominance until a certain density, which may be supported by Daphnia exudates, affecting the cyanobacterial physiological state and metabolites’ production. Therefore, we hypothesized that D. magna spent medium will impact the production of cyanobacterial bioactive metabolites and affect cyanobacterial photosynthetic activity in the nontoxic, but not the toxic strain. Microcystin (MC-LR and des-MC-LR) producing M. aeruginosa PCC7806 and...
Tipo: Text
Palavras-chave: Cyanobacteria; Secondary metabolites; PCC7806; Toxic; Mutant; Infochemicals.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00507/61893/65980.pdf

Salt Shock Responses of Microcystis Revealed through Physiological, Transcript, and Metabolomic Analyses
Provedor de dados: 5
Autores: Georges Des Aulnois, Maxime; Réveillon, Damien; Robert, Elise; Caruana, Amandine; Briand, Enora; Guljamow, Arthur; Dittmann, Elke; Amzil, Zouher; Bormans, Myriam.
The transfer of Microcystis aeruginosa from freshwater to estuaries has been described worldwide and salinity is reported as the main factor controlling the expansion of M. aeruginosa to coastal environments. Analyzing the expression levels of targeted genes and employing both targeted and non-targeted metabolomic approaches, this study investigated the e ect of a sudden salt increase on the physiological and metabolic responses of two toxic M. aeruginosa strains separately isolated from fresh and brackish waters, respectively, PCC 7820 and 7806. Supported by di erences in gene expressions and metabolic profiles, salt tolerance was found to be strain specific. An increase in salinity decreased the growth of M. aeruginosa with a lesser impact on the...
Tipo: Text
Palavras-chave: Microcystis aeruginosa; Microcystin; Salt stress; Metabolomic; Transcript.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00615/72689/71692.pdf

Physiological and Metabolic Responses of Freshwater and Brackish-Water Strains of   Microcystis aeruginosa   Acclimated to a Salinity Gradient: Insight into Salt Tolerance
Provedor de dados: 5
Autores: Georges Des Aulnois, Maxime; Roux, Pauline; Caruana, Amandine; Réveillon, Damien; Briand, Enora; Hervé, Fabienne; Savar, Veronique; Bormans, Myriam; Amzil, Zouher; Atomi, Haruyuki.
Proliferation of microcystin (MC)-producing Microcystis aeruginosa in brackish waters has been described in several locations and represents a new concern for public and environmental health. While the impact of a sudden salinity increase on M. aeruginosa physiology has been studied, less is known about the mechanisms involved in salt tolerance after acclimation. This study aims to compare the physiological responses of two strains of M. aeruginosa (PCC 7820 and PCC 7806), which were isolated from contrasted environments, to increasing salinities. After acclimation, growth and MC production rates were determined and metabolomic analyses were conducted. For both strains, salinity decreased the biovolume, growth, and MC production rates and induced the...
Tipo: Text
Palavras-chave: Acclimation; Metabolomic; Microcystis; Salinity; Sucrose; Trehalose; Ecophysiology.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00588/70031/68012.pdf