Évelyne Derelle
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View article: Co-infection of two eukaryotic pathogens within clam populations in Arcachon Bay
Co-infection of two eukaryotic pathogens within clam populations in Arcachon Bay Open
The parasitic species Perkinsus olseni (= atlanticus ) (Perkinsea, Alveolata) infects a wide range of mollusc species and is responsible for mortality events and economic losses in the aquaculture industry and fisheries worldwide. Thus far…
View article: Emerging Parasitic Protists: The Case of Perkinsea
Emerging Parasitic Protists: The Case of Perkinsea Open
The last century has witnessed an increasing rate of new disease emergence across the world leading to permanent loss of biodiversity. Perkinsea is a microeukaryotic parasitic phylum composed of four main lineages of parasitic protists wit…
View article: Responses to iron oxide and zinc oxide nanoparticles in echinoderm embryos and microalgae: uptake, growth, morphology, and transcriptomic analysis
Responses to iron oxide and zinc oxide nanoparticles in echinoderm embryos and microalgae: uptake, growth, morphology, and transcriptomic analysis Open
We investigated the toxicity of Iron oxide and Zinc oxide engineered nanoparticles (ENPs) on Paracentrotus lividus sea urchin embryos and three species of microalgae. Morphological responses, internalization, and potential impacts of Fe2O3…
View article: Virus-host coexistence in phytoplankton through the genomic lens
Virus-host coexistence in phytoplankton through the genomic lens Open
A dynamic accordion chromosome may promote sustained production of giant viruses by the smallest photosynthetic eukaryote.
View article: Diverse alveolate infections of tadpoles, a new threat to frogs?
Diverse alveolate infections of tadpoles, a new threat to frogs? Open
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View article: Responses to iron oxide and zinc oxide nanoparticles in echinoderm embryos and microalgae: uptake, growth, morphology, and transcriptomic analysis
Responses to iron oxide and zinc oxide nanoparticles in echinoderm embryos and microalgae: uptake, growth, morphology, and transcriptomic analysis Open
We investigated the toxicity of Iron oxide and Zinc oxide engineered nanoparticles (ENPs) on Paracentrotus lividus sea urchin embryos and three species of microalgae. Morphological responses, internalization, and potential impacts of Fe2O3…
View article: Responses to iron oxide and zinc oxide nanoparticles in echinoderm embryos and microalgae: uptake, growth, morphology, and transcriptomic analysis
Responses to iron oxide and zinc oxide nanoparticles in echinoderm embryos and microalgae: uptake, growth, morphology, and transcriptomic analysis Open
We investigated the toxicity of Iron oxide and Zinc oxide engineered nanoparticles (ENPs) on Paracentrotus lividus sea urchin embryos and three species of microalgae. Morphological responses, internalization, and potential impacts of Fe2O3…
View article: Responses to iron oxide and zinc oxide nanoparticles in echinoderm embryos and microalgae: uptake, growth, morphology, and transcriptomic analysis
Responses to iron oxide and zinc oxide nanoparticles in echinoderm embryos and microalgae: uptake, growth, morphology, and transcriptomic analysis Open
We investigated the toxicity of Iron oxide and Zinc oxide engineered nanoparticles (ENPs) on Paracentrotus lividus sea urchin embryos and three species of microalgae. Morphological responses, internalization, and potential impacts of Fe2O3…
View article: Virus-host coexistence in phytoplankton through the genomic lens
Virus-host coexistence in phytoplankton through the genomic lens Open
Phytoplankton-virus interactions are major determinants of geochemical cycles in the oceans. Viruses are responsible for the redirection of carbon and nutrients away from larger organisms back towards microorganisms via the lysis of microa…
View article: A New Freshwater Cyanosiphovirus Harboring Integrase
A New Freshwater Cyanosiphovirus Harboring Integrase Open
Pelagic cyanobacteria are key players in the functioning of aquatic ecosystems, and their viruses (cyanophages) potentially affect the abundance and composition of cyanobacterial communities. Yet, there are few well-described freshwater cy…
View article: Co-occurring nematodes and bacteria in submarine canyon sediments
Co-occurring nematodes and bacteria in submarine canyon sediments Open
In submarine canyon sediments, bacteria and nematodes dominate the benthic biomass and play a key role in nutrient cycling and energy transfer. The diversity of these communities remains, however, poorly studied. This work aims at describi…
View article: Prasinovirus Attack of Ostreococcus Is Furtive by Day but Savage by Night
Prasinovirus Attack of Ostreococcus Is Furtive by Day but Savage by Night Open
Prasinoviruses are large DNA viruses that infect diverse genera of green microalgae worldwide in aquatic ecosystems, but molecular knowledge of their life cycles is lacking. Several complete genomes of both these viruses and their marine a…
View article: Prasinovirus attack of <i>Ostreococcus</i> is furtive by day but savage by night
Prasinovirus attack of <i>Ostreococcus</i> is furtive by day but savage by night Open
Prasinoviruses are large DNA viruses that infect diverse genera of green microalgae worldwide in aquatic ecosystems, but molecular knowledge of their life-cycles is lacking. Several complete genomes of both these viruses and their marine a…
View article: Host-derived viral transporter protein for nitrogen uptake in infected marine phytoplankton
Host-derived viral transporter protein for nitrogen uptake in infected marine phytoplankton Open
Significance Viruses often carry genes acquired from their host. In the present work, we show that a virus of a marine alga carries a gene encoding a transporter protein that mediates nutrient uptake. We confirm that the viral transporter …
View article: Virus production in two <i>O</i>. <i>tauri</i> resistant strains.
Virus production in two <i>O</i>. <i>tauri</i> resistant strains. Open
Very few cells (less than 0.5%) show visible viral particles in their cytoplasm. Morphology of lysing RP cells is similar to that of susceptible cells. (A) Most of the cells of O. tauri RP2 strain without visible viral particles. (B) Divid…
View article: Differential gene expression in OtV5-resistant compared to susceptible control <i>O</i>. <i>tauri</i>.
Differential gene expression in OtV5-resistant compared to susceptible control <i>O</i>. <i>tauri</i>. Open
Up (orange) and Down (purple) regulated genes in virus resistant lines. (A) Counts of differentially transcribed genes per chromosome. (B) Plot of the log2 fold change values of differentially transcribed genes per chromosome. (C) Predicte…
View article: Bipartite structure of chromosome 19.
Bipartite structure of chromosome 19. Open
Genes over-transcribed in virus-resistant lines were all located in a region of ~180 kb (on the left) containing long inverted repeats while under-transcribed genes were on a ~100 kb region (on the right). Tracks from top to bottom: alignm…
View article: Proportion of resistant producer (RP) and resistant non-producer (RNP) lines over the course of the study.
Proportion of resistant producer (RP) and resistant non-producer (RNP) lines over the course of the study. Open
Percentage of RP and RNP in resistant lines on the ordinate and date when virus production test was performed on the abscissa.
View article: Experimental strategy for production of <i>Ostreococcus tauri</i> clonal lines susceptible or resistant to OtV5.
Experimental strategy for production of <i>Ostreococcus tauri</i> clonal lines susceptible or resistant to OtV5. Open
A single colony of O. tauri was used to produce two 1-litre cultures of O. tauri cells, one used to prepare DNA for genome re-sequencing and to produce 46 independent clonal lines and another that was lysed by clonal OtV5. The viral lysate…
View article: A Viral Immunity Chromosome in the Marine Picoeukaryote, Ostreococcus tauri
A Viral Immunity Chromosome in the Marine Picoeukaryote, Ostreococcus tauri Open
Micro-algae of the genus Ostreococcus and related species of the order Mamiellales are globally distributed in the photic zone of world's oceans where they contribute to fixation of atmospheric carbon and production of oxygen, besides prov…
View article: Evolution of a relationship: how Ostreococcus tauri viruses circumvent host resistance
Evolution of a relationship: how Ostreococcus tauri viruses circumvent host resistance Open
Marine microeukaryotes battle every day with environmental pressures, predators and viruses to survive. To escape and survive certain threats they often have to change their life cycle stage for the cost of a lower growth rate. Marine viru…