Éric Maréchal
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View article: Life in the Frozen Ocean
Life in the Frozen Ocean Open
Present seasonally or year-round in polar and subpolar seas, sea ice is one of the most complex and biologically rich ecosystems on Earth. Throughout the history of our planet, sea ice has periodically covered vast proportions of the world…
View article: Snow- and ice-ecosystem cleaning capability of the pucciniomycotinous yeast Phenoliferia psychrophenolica
Snow- and ice-ecosystem cleaning capability of the pucciniomycotinous yeast Phenoliferia psychrophenolica Open
Psychrophilic pucciniomycotinous yeasts inhabit snowfields and glacial ecosystems worldwide, yet their ecological role remains unclear. We isolated a clonal strain of Phenoliferia psychrophenolica (LCC-F-001-001) from an alpine red snowfie…
View article: Functional study of <i>Phaeodactylum tricornutum</i> Seipin highlights specificities of lipid droplets biogenesis in diatoms
Functional study of <i>Phaeodactylum tricornutum</i> Seipin highlights specificities of lipid droplets biogenesis in diatoms Open
Summary Diatoms are a major phylum of microalgae, playing crucial ecological roles. They derive from secondary endosymbiosis, leading to a complex intracellular architecture. Their ability to store oil in lipid droplets (LDs) upon unfavour…
View article: Decoupling of plastid and endomembrane homeoviscous response to low temperature and darkness in <i>Phaeodactylum tricornutum</i>
Decoupling of plastid and endomembrane homeoviscous response to low temperature and darkness in <i>Phaeodactylum tricornutum</i> Open
Understanding how marine diatoms adapt to fluctuating environmental conditions is critical for deciphering their ecological success. Here, we investigated the lipidomic responses of the model diatom Phaeodactylum tricornutum to low tempera…
View article: Satellite remote sensing of red algal blooms in the snow of the European Alps&#160;
Satellite remote sensing of red algal blooms in the snow of the European Alps  Open
In the European Alps, snow sometimes takes a blood-like color in late spring due to the presence of snow algal blooms. These blooms decrease snow albedo, accelerating snowmelt and potentially feeding back on snow and glacier decline caused…
View article: Snow- and ice-ecosystem cleaning capability of the pucciniomycotinous yeast Phenoliferia psychrophenolica
Snow- and ice-ecosystem cleaning capability of the pucciniomycotinous yeast Phenoliferia psychrophenolica Open
Psychrophilic pucciniomycotinous yeasts inhabit snowfields and glacial ecosystems worldwide, yet their ecological role remains unclear. We isolated a clonal strain of Phenoliferia psychrophenolica (LCC-F-001-001) from an alpine red snowfie…
View article: Subcellular ToF-SIMS Imaging of the Snow Alga <i>Sanguina nivaloides</i> by Combining High Mass and High Lateral Resolution Acquisitions
Subcellular ToF-SIMS Imaging of the Snow Alga <i>Sanguina nivaloides</i> by Combining High Mass and High Lateral Resolution Acquisitions Open
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) imaging has demonstrated great potential for metabolic imaging; however, achieving sufficiently high lateral and mass resolution to reach the organelle scale remains challenging. To…
View article: Functional study of<i>Phaeodactylum tricornutum</i>Seipin homolog highlights unique features of lipid droplets biogenesis in diatoms
Functional study of<i>Phaeodactylum tricornutum</i>Seipin homolog highlights unique features of lipid droplets biogenesis in diatoms Open
Diatoms are a major phylum of microalgae, playing crucial ecological roles. They derive from secondary endosymbiosis of a red alga by an unknown heterotrophic eukaryote, leading to a complex intracellular organization. In response to unfav…
View article: Monogalactosyldiacylglycerol synthase isoforms play diverse roles inside and outside the diatom plastid
Monogalactosyldiacylglycerol synthase isoforms play diverse roles inside and outside the diatom plastid Open
Diatoms derive from a secondary endosymbiosis event, which occurred when a eukaryotic host cell engulfed a red alga. This led to the formation of a complex plastid enclosed by 4 membranes: 2 innermost membranes originating from the red alg…
View article: Optimizing Nitrate and Tryptone to Enhance Growth and Triacylglycerol Accumulation in Phaeodactylum tricornutum
Optimizing Nitrate and Tryptone to Enhance Growth and Triacylglycerol Accumulation in Phaeodactylum tricornutum Open
Phaeodactylum tricornutum, a unicellular diatom, is considered a potential feedstock for the production of biofuel and a promising producer for high-value products eicosapentaenoic acid and fucoxanthin. However, a high-efficient cultivatin…
View article: Snowmelt duration controls red algal blooms in the snow of the European Alps
Snowmelt duration controls red algal blooms in the snow of the European Alps Open
Algae populate multiple habitats, including snow and ice, where they can form red blooms. These decrease snow albedo, accelerating snowmelt and potentially feeding back on snow and glacier decline caused by climate change. Quantifying this…
View article: Snow alga <i>Sanguina aurantia</i> as revealed through de novo genome assembly and annotation
Snow alga <i>Sanguina aurantia</i> as revealed through de novo genome assembly and annotation Open
To thrive on melting alpine and polar snow, some Chlorophytes produce an abundance of astaxanthin, causing red blooms, often dominated by genus Sanguina. The red cells have not been cultured, but we recently grew a green biciliate conspeci…
View article: Subcellular ToF-SIMS imaging of the snow alga<i>Sanguina nivaloides</i>by combining high mass and high lateral resolution acquisitions
Subcellular ToF-SIMS imaging of the snow alga<i>Sanguina nivaloides</i>by combining high mass and high lateral resolution acquisitions Open
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) imaging has demonstrated great potential for metabolic imaging, yet achieving sufficiently high lateral and mass resolution to reach the organelle scale remains challenging. We have…
View article: Complementary environmental analysis and functional characterization of lower glycolysis-gluconeogenesis in the diatom plastid
Complementary environmental analysis and functional characterization of lower glycolysis-gluconeogenesis in the diatom plastid Open
Organic carbon fixed in chloroplasts through the Calvin–Benson–Bassham Cycle can be diverted toward different metabolic fates, including cytoplasmic and mitochondrial respiration, gluconeogenesis, and synthesis of diverse plastid metabolit…
View article: Delta-5 elongase knockout reduces docosahexaenoic acid and lipid synthesis and increases heat sensitivity in a diatom
Delta-5 elongase knockout reduces docosahexaenoic acid and lipid synthesis and increases heat sensitivity in a diatom Open
Recent global marine lipidomic analysis reveals a strong relationship between ocean temperature and phytoplanktonic abundance of omega-3 long-chain polyunsaturated fatty acids, especially eicosapentaenoic acid (EPA) and docosahexaenoic aci…
View article: Delta-5 elongase knockout reduces DHA and TAG synthesis coupled with an increase of heat sensitivity in a marine diatom
Delta-5 elongase knockout reduces DHA and TAG synthesis coupled with an increase of heat sensitivity in a marine diatom Open
Recent global marine lipidomic analysis reveals a strong relationship in the ocean between temperature and phytoplanktonic abundance of omega-3 long-chain polyunsaturated fatty acids (LC-PUFAs), especially eicosapentaenoic acid (EPA) and d…
View article: WITHDRAWN: Environmentally-informed functional characterization of a plastid diatom metabolic bridge of mitochondrial origin
WITHDRAWN: Environmentally-informed functional characterization of a plastid diatom metabolic bridge of mitochondrial origin Open
Withdrawal statement The authors have withdrawn this manuscript due to a duplicate posting of manuscript number BIORXIV/2022/507166. Therefore, the authors do not wish this work to be cited as reference for the project. If you have any que…
View article: Correlative TOF-SIMS/SEM for subcellular investigation of microalgae in extreme environment
Correlative TOF-SIMS/SEM for subcellular investigation of microalgae in extreme environment Open
International audience
View article: A new genome-scale metabolic model of oleaginous microalgae with refined lipid metabolism elucidates Microchloropsis gaditana mutant phenotypes.
A new genome-scale metabolic model of oleaginous microalgae with refined lipid metabolism elucidates Microchloropsis gaditana mutant phenotypes. Open
The oleaginous microalga Microchloropsis gaditana (formerly Nannochloropsis gaditana) has gained large interest due to its potential to produce lipids for a wide range of biotechnological applications. To optimize M. gaditana growth condit…
View article: Two plastidial lysophosphatidic acid acyltransferases differentially mediate the biosynthesis of membrane lipids and triacylglycerols in <i>Phaeodactylum tricornutum</i>
Two plastidial lysophosphatidic acid acyltransferases differentially mediate the biosynthesis of membrane lipids and triacylglycerols in <i>Phaeodactylum tricornutum</i> Open
Summary Lysophosphatidic acid acyltransferases (LPAATs) catalyze the formation of phosphatidic acid (PA), a central metabolite in both prokaryotic and eukaryotic organisms for glycerolipid biosynthesis. Phaeodactylum tricornutum contains a…
View article: Dryland Endolithic <i>Chroococcidiopsis</i> and Temperate Fresh Water <i>Synechocystis</i> Have Distinct Membrane Lipid and Photosynthesis Acclimation Strategies upon Desiccation and Temperature Increase
Dryland Endolithic <i>Chroococcidiopsis</i> and Temperate Fresh Water <i>Synechocystis</i> Have Distinct Membrane Lipid and Photosynthesis Acclimation Strategies upon Desiccation and Temperature Increase Open
An effect of climate change is the expansion of drylands in temperate regions, predicted to affect microbial biodiversity. Since photosynthetic organisms are at the base of ecosystem’s trophic networks, we compared an endolithic desiccatio…
View article: Allele-dependent expression and functionality of lipid enzyme phospholipid:diacylglycerol acyltransferase affect diatom carbon storage and growth
Allele-dependent expression and functionality of lipid enzyme phospholipid:diacylglycerol acyltransferase affect diatom carbon storage and growth Open
In the acyl-CoA-independent pathway of triacylglycerol (TAG) synthesis unique to plants, fungi, and algae, TAG formation is catalyzed by the enzyme phospholipid:diacylglycerol acyltransferase (PDAT). The unique PDAT gene of the model diato…
View article: Proteomes reveal the lipid metabolic network in the complex plastid of <i>Phaeodactylum tricornutum</i>
Proteomes reveal the lipid metabolic network in the complex plastid of <i>Phaeodactylum tricornutum</i> Open
SUMMARY Phaeodactylum tricornutum plastid is surrounded by four membranes, and its protein composition and function remain mysterious. In this study, the P. tricornutum plastid‐enriched fraction was obtained and 2850 proteins were identifi…