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Gwenael Piganeau

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Le picophytoplancton comprend les plus petits eucaryotes photosynthétiques qui sont à la base de nombreux écosystèmes marins. Avec des cellules de diamètre inférieur à 2 μm, une organisation cellulaire simple et des génomes haploïdes compacts, ces picoalgues sont des organismes modèles idéaux pour étudier les signatures génomiques des adaptations et des interactions. La plupart des communautés naturelles de picophytoplancton sont les hôtes de virus, dont les prasinovirus, de très grands virus à ADN qui font partie de la famille des virus géants. Mon équipe contribue à la mise en place de ressources biologiques et génomiques de nombreuses picoalgues de la lignée verte (classe des Mamiellophyceae) ainsi que leurs virus, principalement de la Méditerranée, mais également dans le monde entier via nos collaborations. Mes projets de recherche reposent sur des approches de biologie intégrative en combinant des analyses expérimentales et bioinformatiques pour répondre à deux types de problématiques: (1) celle de l'origine et l'évolution de la diversité génétique de ces systèmes biologiques, et sa relation avec les facteurs biotiques et abiotiques. (2) celle des interactions phytoplancton – virus, à la fois sur de longues périodes évolutives par l’analyse des génomes de microalgue - prasinovirus phylogénétiquement divergents, et sur de courtes échelles évolutives en utilisant des approches d’évolution expérimentale.

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Publications

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Editorial: Algal symbiotic relationships in freshwater and marine environments

Leila Tirichine , Gwenael Piganeau
Frontiers in Plant Science, 2023, 14, ⟨10.3389/fpls.2023.1155759⟩
Journal articles hal-04284580v1
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A high frequency of chromosomal duplications in unicellular algae is compensated by translational regulation

Marc Krasovec , Rémy Merret , Frédéric Sanchez , Sophie Sanchez-Brosseau , Gwenaël Piganeau
Genome Biology and Evolution, 2023, 15 (6), ⟨10.1093/gbe/evad086⟩
Journal articles hal-04104946v1
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Diversity and Evolution of Mamiellophyceae: Early-Diverging Phytoplanktonic Green Algae Containing Many Cosmopolitan Species

Charmaine C M Yung , Elvira Rey Redondo , Frederic Sanchez , Sheree Yau , Gwenael Piganeau
Journal of Marine Science and Engineering, 2022, 10 (2), ⟨10.3390/jmse10020240⟩
Journal articles hal-03870281v1
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Evolutionary genomics of sex-related chromosomes at the base of the green lineage 2

L Felipe Benites , François Bucchini , Sophie Sanchez-Brosseau , Nigel Grimsley , Klaas Vandepoele
Genome Biology and Evolution, 2021, ⟨10.1093/gbe/evab216/6380139⟩
Journal articles hal-03369980v1
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Features of the Opportunistic Behaviour of the Marine Bacterium Marinobacter algicola in the Microalga Ostreococcus tauri Phycosphere

Jordan Pinto , Raphaël Lami , Marc Krasovec , Regis Grimaud , Laurent Urios
Microorganisms, 2021, 9 (8), pp.1777. ⟨10.3390/microorganisms9081777⟩
Journal articles hal-03348932v1
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Combining Nanopore and Illumina Sequencing Permits Detailed Analysis of Insertion Mutations and Structural Variations Produced by PEG-Mediated Transformation in Ostreococcus tauri

Julie Thomy , Frédéric Sanchez , Marta Gut , Fernando Cruz , Tyler Alioto
Cells, 2021, 10 (3), pp.664. ⟨10.3390/cells10030664⟩
Journal articles hal-03190245v1
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Metabolomic Insights into Marine Phytoplankton Diversity

Rémy Marcellin-Gros , Gwenael Piganeau , Didier Stien
Marine drugs, 2020, 18 (2), pp.78. ⟨10.3390/md18020078⟩
Journal articles hal-02466066v1
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Virus-host coexistence in phytoplankton through the genomic lens

Sheree Yau , Marc Krasovec , L. Felipe Felipe Benites , Stéphane Rombauts , Mathieu Groussin
Science Advances , 2020, 6 (14), pp.eaay2587. ⟨10.1126/sciadv.aay2587⟩
Journal articles hal-02557501v1
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Genome Resolved Biogeography of Mamiellales

Jade Leconte , L. Felipe Felipe Benites , Thomas Vannier , Patrick Wincker , Gwenael Piganeau
Genes, 2020, 11 (1), pp.66. ⟨10.3390/genes11010066⟩
Journal articles hal-02505108v1
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Single cell ecogenomics reveals mating types of individual cells and ssDNA viral infections in the smallest photosynthetic eukaryotes

L. Felipe Felipe Benites , Nicole Poulton , Karine Labadie , Michael E. Sieracki , Nigel Grimsley
Philosophical Transactions of the Royal Society B: Biological Sciences, 2019, 374 (1786), pp.20190089. ⟨10.1098/rstb.2019.0089⟩
Journal articles hal-02310726v1

A genomics approach reveals the global genetic polymorphism, structure, and functional diversity of ten accessions of the marine model diatom Phaeodactylum tricornutum

Achal Rastogi , Fabio Rocha Jimenez Vieira , Anne-Flore Deton-Cabanillas , Alaguraj Veluchamy , Catherine Cantrel
The International Society of Microbiologial Ecology Journal, 2019, 14 (2), pp.347-363. ⟨10.1038/s41396-019-0528-3⟩
Journal articles hal-02364824v1
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First Estimation of the Spontaneous Mutation Rate in Diatoms

Marc Krasovec , Sophie Sanchez-Brosseau , Gwenael Piganeau
Genome Biology and Evolution, 2019, ⟨10.1093/gbe/evz130⟩
Journal articles hal-02978190v2

Genome Analyses of the Microalga Picochlorum Provide Insights into the Evolution of Thermotolerance in the Green Lineage

Marc Krasovec , Emmelien Vancaester , Stéphane Rombauts , François Bucchini , Sheree Yau
Genome Biology and Evolution, 2018
Journal articles hal-03924023v1
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Spontaneous mutation rate as a source of diversity for improving desirable traits in cultured microalgae

Marc Krasovec , Sophie Sanchez-Brosseau , Nigel Grimsley , Gwenael Piganeau
Algal Research - Biomass, Biofuels and Bioproducts, 2018, 35, pp.85-90. ⟨10.1016/j.algal.2018.08.003⟩
Journal articles hal-01957301v1
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Population genomics of picophytoplankton unveils novel chromosome hypervariability

Romain Blanc-Mathieu , Marc Krasovec , Maxime Hebrard , Sheree Yau , Elodie Desgranges
Science Advances , 2017, 3 (7), pp.e1700239. ⟨10.1126/sciadv.1700239⟩
Journal articles lirmm-01842137v1
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Spontaneous Mutation Rate in the Smallest Photosynthetic Eukaryotes

Marc Krasovec , Adam Eyre-Walker , Sophie Sanchez-Ferandin , Gwenael Piganeau
Molecular Biology and Evolution, 2017, 34 (7), pp.1770-1779. ⟨10.1093/molbev/msx119⟩
Journal articles hal-01546014v1
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Fish larval recruitment to reefs is a thyroid hormone-mediated metamorphosis sensitive to the pesticide chlorpyrifos

Guillaume Holzer , Marc Besson , Anne Lambert , Loïc François , Paul Barth
eLife, 2017, 6, pp.e27595. ⟨10.7554/eLife.27595⟩
Journal articles hal-01633712v1
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Marinobacter Dominates the Bacterial Community of the Ostreococcus tauri Phycosphere in Culture

Josselin Lupette , Raphaël Lami , Marc Krasovec , Nigel Grimsley , Hervé Moreau
Frontiers in Microbiology, 2016, 7, pp.1414. ⟨10.3389/fmicb.2016.01414⟩
Journal articles hal-01373902v1
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Fitness Effects of Spontaneous Mutations in Picoeukaryotic Marine Green Algae

Marc Krasovec , Adam Eyre-Walker , Nigel Grimsley , Christophe Salmeron , David Pecqueur
G3, 2016, 6, pp.2063 - 2071. ⟨10.1534/g3.116.029769⟩
Journal articles hal-03800071v1
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A Viral Immunity Chromosome in the Marine Picoeukaryote, Ostreococcus tauri

Sheree Yau , Claire Hemon , Evelyne Derelle , Hervé Moreau , Gwenaë L Piganeau
PLoS Pathogens, 2016, 12 (10), pp.e1005965. ⟨10.1371/journal.ppat.1005965⟩
Journal articles hal-01391068v1
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The rate of adaptive evolution in animal mitochondria

Jennifer E. James , Gwenael Piganeau , Adam Eyre-Walker
Molecular Ecology, 2015, 25 (1), pp.67-78 ⟨10.1111/mec.13475⟩
Journal articles hal-01246333v1
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Community The Marine Microbial Eukaryote Transcriptome Sequencing Project (MMETSP): Illuminating the Functional Diversity of Eukaryotic Life in the Oceans through Transcriptome Sequencing

Patrick J Keeling , Fabien Burki , Heather M. Wilcox , Bassem Allam , Eric E Allen
PLoS Biology, 2014, 12 (6), pp.e1001889. ⟨10.1371/journal.pbio.1001889⟩
Journal articles hal-01109521v1
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An improved genome of the model marine alga [i]Ostreococcus tauri[/i] unfolds by assessing Illumina [i]de novo[/i] assemblies

Romain Blanc Mathieu , Bram Verhelst , Evelyne Derelle , Stephane Rombauts , Francois-Yves Bouget
BMC Genomics, 2014, 15, pp.1-11. ⟨10.1186/1471-2164-15-1103⟩
Journal articles hal-01130514v1
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Bacteria in Ostreococcus tauri cultures – friends, foes or hitchhikers?

Sophie S Abby , Marie Touchon , Aurelien de Jode , Nigel Grimsley , Gwenael Piganeau
Frontiers in Microbiology, 2014, 5, pp.505. ⟨10.3389/fmicb.2014.00505⟩
Journal articles hal-01321228v1

Morphology, Genome Plasticity, and Phylogeny in the Genus Ostreococcus Reveal a Cryptic Species, O. mediterraneus sp nov (Mamiellales, Mamiellophyceae)

Lucie L. Subirana , Berangere B. Pequin , Stéphanie S. Michely , Marie-Line M.-L. Escande , Julie J. Meilland
Protist, 2013, 164 (5), pp.643 - 659. ⟨10.1016/j.protis.2013.06.002⟩
Journal articles hal-01004323v1

Evolution of Codon Usage In The Smallest Photosynthetic Eukaryotes And Their Giant Viruses

S. Michely , E. Toulza , L. Subirana , J. Uwe , V. Cognat
Genome Biology, 2013, 5 (5), pp.848-859. ⟨10.1093/gbe/evt053⟩
Journal articles hal-00823210v1
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Organellar Inheritance in the Green Lineage: Insights from Ostreococcus tauri

Romain Blanc-Mathieu , Sophie Sanchez-Ferandin , Adam Eyre-Walker , Gwenael Piganeau
Genome Biology and Evolution, 2013, 5 (8), pp.1503-1511. ⟨10.1093/gbe/evt106⟩
Journal articles hal-01579089v1

Gene functionalities and genome structure in Bathycoccus prasinos reflect cellular specializations at the base of the green lineage

Hervé Moreau , Bram Verhelst , Arnaud Couloux , Evelyne Derelle , Stephane Rombauts
Genome Biology, 2012, 13 (8), pp.R74. ⟨10.1186/gb-2012-13-8-r74⟩
Journal articles hal-03160896v1
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Metagenomes of the picoalga Bathycoccus from the Chile coastal upwelling.

Daniel Vaulot , Cécile Lepère , Eve Toulza , Rodrigo de La Iglesia , Julie Poulain
PLoS ONE, 2012, 7 (6), pp.e39648. ⟨10.1371/journal.pone.0039648⟩
Journal articles hal-00848707v1

Environmental and evolutionary genomics of microbial algae: power and challenges of metagenomics

Eve Toulza , R. Blanc-Mathieu , Sébastien Gourbière , G. Piganeau
Advances in Botanical Research, 2012, 64, pp.383-427. ⟨10.1016/b978-0-12-391499-6.00010-4⟩
Journal articles halsde-00823691v1

Marine prasinovirus genomes show low evolutionary divergence and acquisition of protein metabolism genes by horizontal gene transfer.

Hervé Moreau , Gwenael Piganeau , Yves Desdevises , Richard Cooke , Evelyne Derelle
Journal of Virology, 2010, 84 (24), pp.12555-63. ⟨10.1128/JVI.01123-10⟩
Journal articles hal-00787391v1

Clues about the genetic basis of adaptation emerge from comparing the proteomes of two Ostreococcus ecotypes (Chlorophyta, Prasinophyceae).

Séverine Jancek , Sébastien Gourbière , Hervé Moreau , Gwenaël Piganeau
Molecular Biology and Evolution, 2008, 25 (11), pp.2293-300. ⟨10.1093/molbev/msn168⟩
Journal articles halsde-00459220v1

Picoeukaryotic sequences in the Sargasso Sea metagenome

Gwenael Piganeau , Yves Desdevises , Evelyne Derelle , Herve Moreau
Genome Biology, 2008, 9 (1), pp.R5. ⟨10.1186/gb-2008-9-1-r5⟩
Journal articles hal-03160852v1
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Life-Cycle and Genome of OtV5, a Large DNA Virus of the Pelagic Marine Unicellular Green Alga Ostreococcus tauri

Evelyne Derelle , Conchita Ferraz , Marie-Line Escande , Sophie Eychenié , Richard Cooke
PLoS ONE, 2008, 3 (5), pp.e2250. ⟨10.1371/journal.pone.0002250⟩
Journal articles hal-02114367v1

The tiny eukaryote Ostreococcus provides genomic insights into the paradox of plankton speciation

Brian Palenik , Jane Grimwood , Andrea Aerts , Pierre Rouzé , Asaf Salamov
Proceedings of the National Academy of Sciences of the United States of America, 2007, 104 (18), pp.7705-7710. ⟨10.1073/pnas.0611046104⟩
Journal articles hal-03160904v1

Genome analysis of the smallest free-living eukaryote Ostreococcus tauri unveils many unique features.

Evelyne Derelle , Conchita Ferraz , Stephane Rombauts , Pierre Rouzé , Alexandra Z Worden
Proceedings of the National Academy of Sciences of the United States of America, 2006, 103 (31), pp.11647-52. ⟨10.1073/pnas.0604795103⟩
Journal articles hal-00164247v1

Expected Relationship Between the Silent Substitution Rate and the GC Content: Implications for the Evolution of Isochores

G. Piganeau , Dominique Mouchiroud , L. Duret , Christian Gautier
Journal of Molecular Evolution, 2002, 54, pp.129-133
Journal articles hal-00427292v1

Hill-Robertson interference is a minor determinant of variations in codon bias across Drosophila melanogaster and Caenorhabditis elegans genomes

Gabriel Marais , G. Piganeau
Molecular Biology and Evolution, 2002, 19, pp.1399-1406
Journal articles hal-00427287v1

Vanishing GC-Rich Isochores in Mammalian Genomes

L. Duret , M. Sémon , G. Piganeau , Dominique Mouchiroud , N. Galtier
Genetics, 2002, 162, pp.1837-1848
Journal articles hal-00427269v1

Multiplicative versus additive selection in relation to genome evolution: a simulation study

G. Piganeau , R. Westrelin , B. Tourancheau , Christian Gautier
Genetical Research, 2001, 78, pp.171-175
Journal articles hal-00427144v1

GC-content evolution in mammalian genomes: the biased gene conversion hypothesis

N. Galtier , G. Piganeau , Dominique Mouchiroud , L. Duret
Genetics, 2001, 159, pp.907-911
Journal articles hal-00427173v1

High copy numbers of multiple transposable element families in an Australian population of Drosophila simulans

Cristina Vieira , G. Piganeau , C. Biemont
Genetical Research, 2000, 76, pp.117-119
Journal articles hal-00427118v1