189 results on '"Armant, Olivier"'
Search Results
2. Editorial trend: adverse outcome pathway (AOP) and computational strategy — towards new perspectives in ecotoxicology
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Baudiffier, Damien, Audouze, Karine, Armant, Olivier, Frelon, Sandrine, Charles, Sandrine, Beaudouin, Remy, Cosio, Claudia, Payrastre, Laurence, Siaussat, David, Burgeot, Thierry, Mauffret, Aourell, Degli Esposti, Davide, Mougin, Christian, Delaunay, Delphine, and Coumoul, Xavier
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- 2023
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3. Population transcriptogenomics highlights impaired metabolism and small population sizes in tree frogs living in the Chernobyl Exclusion Zone
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Car, Clément, Gilles, André, Goujon, Elen, Muller, Marie-Laure Delignette, Camoin, Luc, Frelon, Sandrine, Burraco, Pablo, Granjeaud, Samuel, Baudelet, Emilie, Audebert, Stéphane, Orizaola, Germán, Armengaud, Jean, Tenenhaus, Arthur, Garali, Imène, Bonzom, Jean-Marc, and Armant, Olivier
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- 2023
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4. Tritiated thymidine induces developmental delay, oxidative stress and gene overexpression in developing zebrafish (Danio rerio)
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Schiano Di Lombo, Magali, Cavalié, Isabelle, Camilleri, Virginie, Armant, Olivier, Perrot, Yann, Cachot, Jérôme, and Gagnaire, Béatrice
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- 2023
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5. Systems toxicology of complex wood combustion aerosol reveals gaseous carbonyl compounds as critical constituents
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Dilger, Marco, Armant, Olivier, Ramme, Larissa, Mülhopt, Sonja, Sapcariu, Sean C., Schlager, Christoph, Dilger, Elena, Reda, Ahmed, Orasche, Jürgen, Schnelle-Kreis, Jürgen, Conlon, Thomas M., Yildirim, Ali Önder, Hartwig, Andrea, Zimmermann, Ralf, Hiller, Karsten, Diabaté, Silvia, Paur, Hanns-Rudolf, and Weiss, Carsten
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- 2023
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6. Altered ovarian transcriptome is linked to early mortality and abnormalities in zebrafish embryos after maternal exposure to gamma irradiation
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Guirandy, Noëmie, Armant, Olivier, Frelon, Sandrine, Pierron, Fabien, Geffroy, Benjamin, Daffe, Guillemine, Houdelet, Camille, Gonzalez, Patrice, and Simon, Olivier
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- 2023
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7. Insights into the modes of action of tritium on the early-life stages of zebrafish, Danio rerio, using transcriptomic and proteomic analyses
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Arcanjo, Caroline, Frelon, Sandrine, Armant, Olivier, Camoin, Luc, Audebert, Stéphane, Camilleri, Virginie, Cavalié, Isabelle, Adam-Guillermin, Christelle, and Gagnaire, Beatrice
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- 2023
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8. Ionizing radiation affects the demography and the evolution of Caenorhabditis elegans populations
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Quevarec, Loïc, Réale, Denis, Dufourcq-Sekatcheff, Elizabeth, Armant, Olivier, Adam-Guillermin, Christelle, and Bonzom, Jean-Marc
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- 2023
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9. Radiation Adverse Outcome pathways (AOPs): examining priority questions from an international horizon-style exercise.
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Chauhan, Vinita, Beaton, Danielle, Tollefsen, Knut Erik, Preston, Julian, Burtt, Julie J., Leblanc, Julie, Hamada, Nobuyuki, Azzam, Edouard I., Armant, Olivier, Bouffler, Simon, Azimzadeh, Omid, Moertl, Simone, Yamada, Yutaka, Tanaka III, Ignacia B., Kaiser, Jan Christian, Applegate, Kimberly, Laurier, Dominique, and Garnier-Laplace, Jacqueline
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NUCLEAR energy ,IONIZING radiation ,EXPOSURE dose ,RADIATION ,RESEARCH questions - Abstract
The Organisation for Economic Co-operation and Development (OECD) Adverse Outcome Pathway (AOP) Development Programme is being explored in the radiation field, as an overarching framework to identify and prioritize research needs that best support strengthening of radiation risk assessment and risk management strategies. To advance the use of AOPs, an international horizon-style exercise (HSE) was initiated through the Radiation/Chemical AOP Joint Topical Group (JTG) formed by the OECD Nuclear Energy Agency (NEA) High-Level Group on Low Dose Research (HLG-LDR) under the auspices of the Committee on Radiological Protection and Public Health (CRPPH). The intent of the HSE was to identify key research questions for consideration in AOP development that would help to reduce uncertainties in estimating the health risks following exposures to low dose and low dose-rate ionizing radiation. The HSE was conducted in several phases involving the solicitation of relevant questions, a collaborative review of open-ended candidate questions and an elimination exercise that led to the selection of 25 highest priority questions for the stated purpose. These questions were further ranked by over 100 respondents through an international survey. This final set of questions was judged to provide insights into how the OECD's AOP approach can be put into practice to meet the needs of hazard and risk assessors, regulators, and researchers. This paper examines the 25 priority questions in the context of hazard/risk assessment framework for ionizing radiation. By addressing the 25 priority questions, it is anticipated that constructed AOPs will have a high level of specificity, making them valuable tools for simplifying and prioritizing complex biological processes for use in developing revised radiation hazard and risk assessment strategies. [ABSTRACT FROM AUTHOR]
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- 2024
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10. Dose-dependent genomic DNA hypermethylation and mitochondrial DNA damage in Japanese tree frogs sampled in the Fukushima Daiichi area
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Gombeau, Kewin, Bonzom, Jean-Marc, Cavalié, Isabelle, Camilleri, Virginie, Orjollet, Daniel, Dubourg, Nicolas, Beaugelin-Seiller, Karine, Bourdineaud, Jean-Paul, Lengagne, Thierry, Armant, Olivier, Ravanat, Jean-Luc, and Adam-Guillermin, Christelle
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- 2020
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11. Citizen science in environmental health research: A comparison with conventional approaches and creation of a guidance tool issued from the LILAS initiative
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Laurent, Olivier, Gironza, Yara Carrejo, Ancelet, Sophie, Armant, Olivier, Bard, Denis, Baumgartner, Katia, Bortoli, Sylvie, Boudet, Céline, Chamaret, Philippe, Cormier, Stéphanie, David, Arthur, Desqueyroux, Hélène, Gerber, Mariette, Grimbuhler, Sonia, Mougin, Christian, Payrastre, Laurence, Schraub, Simon, Trousse, Brigitte, Reaud, Cynthia, and Charron, Sylvie
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- 2024
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12. Editorial trend: adverse outcome pathway (AOP) and computational strategy — towards new perspectives in ecotoxicology.
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Baudiffier, Damien, Audouze, Karine, Armant, Olivier, Frelon, Sandrine, Charles, Sandrine, Beaudouin, Remy, Cosio, Claudia, Payrastre, Laurence, Siaussat, David, Burgeot, Thierry, Mauffret, Aourell, Degli Esposti, Davide, Mougin, Christian, Delaunay, Delphine, and Coumoul, Xavier
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ENVIRONMENTAL toxicology ,ARTIFICIAL intelligence ,PHARMACODYNAMICS ,COMPUTATIONAL neuroscience ,TOXICOLOGY ,SYSTEMS biology ,RISK assessment - Abstract
The adverse outcome pathway (AOP) has been conceptualized in 2010 as an analytical construct to describe a sequential chain of causal links between key events, from a molecular initiating event leading to an adverse outcome (AO), considering several levels of biological organization. An AOP aims to identify and organize available knowledge about toxic effects of chemicals and drugs, either in ecotoxicology or toxicology, and it can be helpful in both basic and applied research and serve as a decision-making tool in support of regulatory risk assessment. The AOP concept has evolved since its introduction, and recent research in toxicology, based on integrative systems biology and artificial intelligence, gave it a new dimension. This innovative in silico strategy can help to decipher mechanisms of action and AOP and offers new perspectives in AOP development. However, to date, this strategy has not yet been applied to ecotoxicology. In this context, the main objective of this short article is to discuss the relevance and feasibility of transferring this strategy to ecotoxicology. One of the challenges to be discussed is the level of organisation that is relevant to address for the AO (population/community). This strategy also offers many advantages that could be fruitful in ecotoxicology and overcome the lack of time, such as the rapid identification of data available at a time t, or the identification of "data gaps". Finally, this article proposes a step forward with suggested priority topics in ecotoxicology that could benefit from this strategy. [ABSTRACT FROM AUTHOR]
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- 2024
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13. Characterization of Phormidium lacuna strains from the North Sea and the Mediterranean Sea for biotechnological applications
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Nies, Fabian, Wörner, Sybille, Wunsch, Nadja, Armant, Olivier, Sharma, Vikas, Hesselschwerdt, Anne, Falk, Fabian, Weber, Nora, Weiß, Julia, Trautmann, Andreas, Posten, Clemens, Prakash, Tulika, and Lamparter, Tilman
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- 2017
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14. Expression of a Barhl1a reporter in subsets of retinal ganglion cells and commissural neurons of the developing zebrafish brain
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Albadri, Shahad, Armant, Olivier, Aljand-Geschwill, Tairi, Del Bene, Filippo, Carl, Matthias, Strähle, Uwe, and Poggi, Lucia
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- 2020
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15. Living Labs and other participatory approaches applied to research on multiple environnemental exposures and chronic risks
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LAURENT, Olivier, Yara Carrejo, Gironza, Ancelet, Sophie, Armant, Olivier, Denis, Bard, Katia, Baumgartner, Sylvie, Bortoli, Boudet, Céline, Chamaret, Philippe, Chartier, Michel, Cormier, Stéphanie, Arthur, David, Desqueyroux, Hélène, Gerber, Mariette, Gilbin, Rodolphe, Grimbuhler, Sonia, Grison, Stephane, Larqué, Lionel, Laurier, Dominique, Mougin, Christian, Gamet-Payrastre, Laurence, Rannou, Alain, Scanff, Pascale, Vanzemberg, Arnaud, Schraub, Simon, Supervil, Sylvie, Thybaud, Eric, Trousse, Brigitte, Charron, Sylvie, Laboratoire d épidémiologie des rayonnements ionisants (IRSN/PSE-SANTE/SESANE/LEPID), Service de recherche sur les effets biologiques et Sanitaires des rayonnements ionisants (IRSN/PSE-SANTE/SESANE), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Institut de recherche en santé, environnement et travail (Irset), Université d'Angers (UA)-Université de Rennes (UR)-École des Hautes Études en Santé Publique [EHESP] (EHESP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Laboratoire d'écotoxicologie des radionucléides (IRSN/PSE-ENV/SRTE/LECO), Service de recherche sur les transferts et les effets des radionucléides sur les écosystèmes (IRSN/PSE-ENV/SRTE), Société francophone de santé environnement (SFSE), France Nature Environnement (FNE), Toxicité environnementale, cibles thérapeutiques, signalisation cellulaire (T3S - UMR_S 1124), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut National de l'Environnement Industriel et des Risques (INERIS), Institut Ecocitoyen pour la Connaissance des Pollutions [Fos-sur-Mer], Centre Permanent d'Initiatives pour l'Environnement des Pays de l'Aisne (CPIE des Pays de l'Aisne), École des Hautes Études en Santé Publique [EHESP] (EHESP), Département des sciences en santé environnementale (DEESSE), Agence de l'Environnement et de la Maîtrise de l'Energie (ADEME), Association nationale des comités et commissions locales d'information [Teteghem] (ANCCLI), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Technologies et Méthodes pour les Agricultures de demain (UMR ITAP), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Laboratoire de radiotoxicologie et radiobiologie expérimentale (IRSN/PSE-SANTE/SESANE/LRTOX), ALLISS Sciences Sociétés [Paris], Ecologie fonctionnelle et écotoxicologie des agroécosystèmes (ECOSYS), AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Pôle Santé Environnement - Direction Santé (IRSN/PSE-SANTE), Cellule Valorisation des données (IRSN/DTR/D3NSI/SVDDA/CVD), Direction Déléguée Développement numérique et aux systèmes d’information (IRSN/DTR/D3NSI), Ligue Nationale Contre le Cancer (LNCC), Direction des Risques et de la Performance (IRSN/DRP), Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria), Service des politiques d’ouverture à la société (IRSN/DST/SPOS), Direction de la Stratégie (IRSN/DST), IRSN 2030, IS Global, and Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INP - PURPAN)
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[SDE.ES]Environmental Sciences/Environmental and Society - Abstract
International audience; The objectives of environmental health research are diverse (e.g.: identifying situations at potential risk, estimating exposures and effects, testing the effectiveness of preventive actions) and related methods are diverse as well. Opportunities for greater implication of the civil society and related challenges differ at each step of research activities. These aspects need to be better known and shared collectively.
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- 2023
16. The LILAS project: analysis of applying participatory approaches such as Living Labs to research on multiple environmental exposures to ionizing radiation, other stressors and chronic risks
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LAURENT, Olivier, Yara Carrejo, Gironza, Ancelet, Sophie, Armant, Olivier, Denis, Bard, Katia, Baumgartner, Sylvie, Bortoli, Boudet, Céline, Chamaret, Philippe, Chartier, Michel, Cormier, Stéphanie, Arthur, David, Desqueyroux, Hélène, Gerber, Mariette, Gilbin, Rodolphe, Grimbuhler, Sonia, Larqué, Lionel, Laurier, Dominique, Mougin, Christian, Gamet-Payrastre, Laurence, Rannou, Alain, Reaud, Cynthia, Scanff, Pascale, Vanzemberg, Arnaud, Schraub, Simon, Supervil, Sylvie, Eric, Thybaud, Trousse, Brigitte, Charron, Sylvie, Laboratoire d épidémiologie des rayonnements ionisants (IRSN/PSE-SANTE/SESANE/LEPID), Service de recherche sur les effets biologiques et Sanitaires des rayonnements ionisants (IRSN/PSE-SANTE/SESANE), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Institut de recherche en santé, environnement et travail (Irset), Université d'Angers (UA)-Université de Rennes (UR)-École des Hautes Études en Santé Publique [EHESP] (EHESP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Laboratoire d'écotoxicologie des radionucléides (IRSN/PSE-ENV/SRTE/LECO), Service de recherche sur les transferts et les effets des radionucléides sur les écosystèmes (IRSN/PSE-ENV/SRTE), Société francophone de santé environnement (SFSE), France Nature Environnement (FNE), Toxicité environnementale, cibles thérapeutiques, signalisation cellulaire (T3S - UMR_S 1124), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut National de l'Environnement Industriel et des Risques (INERIS), Institut Ecocitoyen pour la Connaissance des Pollutions [Fos-sur-Mer], Centre Permanent d'Initiatives pour l'Environnement des Pays de l'Aisne (CPIE des Pays de l'Aisne), École des Hautes Études en Santé Publique [EHESP] (EHESP), Agence de l'Environnement et de la Maîtrise de l'Energie (ADEME), Association nationale des comités et commissions locales d'information [Teteghem] (ANCCLI), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Technologies et Méthodes pour les Agricultures de demain (UMR ITAP), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), ALLISS Sciences Sociétés [Paris], Ecologie fonctionnelle et écotoxicologie des agroécosystèmes (ECOSYS), AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INP - PURPAN), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Pôle Santé Environnement - Direction Santé (IRSN/PSE-SANTE), Service des politiques d’ouverture à la société (IRSN/DST/SPOS), Direction de la Stratégie (IRSN/DST), Cellule Valorisation des données (IRSN/DTR/D3NSI/SVDDA/CVD), Direction Déléguée Développement numérique et aux systèmes d’information (IRSN/DTR/D3NSI), Service de la programmation, des partenariats, de la prospective et de l’appui à l’innovation (IRSN/DST/SP3IN), Ligue Nationale Contre le Cancer (LNCC), Direction des Risques et de la Performance (IRSN/DRP), Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria), IRSN2030, ICRP - International Commission on Radiation Protection, Université de Rennes (UR), Département des sciences en santé environnementale (DEESSE), Laboratoire d'étude et de recherche en environnement et santé (LERES), Institut National de la Santé et de la Recherche Médicale (INSERM), Institut de Protection et Sûreté Nucléaire (IPSN), Laboratoire de radiotoxicologie et radiobiologie expérimentale (IRSN/PRP-HOM/SRBE/LRTOX), Laboratoire de radiotoxicologie et radiobiologie expérimentale (IRSN/PSE-SANTE/SESANE/LRTOX), IRSN via appel à projets interne IRSN2030, TECNICO LISBOA, and Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan)
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[SDE]Environmental Sciences ,[SDE.ES]Environmental Sciences/Environmental and Society - Abstract
International audience; Participatory research approaches in environmental health are still rarely applied to radiation research. Opportunities for greater implication of the civil society and related challenges differ at each step of such research activities. The LILAS project aimed, as a preparatory step toward the development of participatory research projects on multiple environmental exposures to ionizing radiation and other stressors
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- 2022
17. Radiological and chemical exposures and risks of cancer in the Constances cohort (COREXCA)
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LAURENT, Olivier, Renaud, Philippe, Broggio, David, Blanchardon, Eric, Dreuil, Serge, Greau, Claire, Vignaud, Caroline, Ancelet, Sophie, Armant, Olivier, Bernier, Marie-Odile, Clero, Enora, Durand, Christelle, Ebrahimian Chiusa, Teni, Foucault, Anais, Goldberg, Marcel, Guerin, Sabine, Huet, Christelle, Lequy, Emeline, Métivier, Jean-Michel, Grison, Stephane, Ibanez, Chrystelle, Ielsch, Géraldine, Klokov, Dmitry, Monceau, V., Roy, Herve, guihenneuc, chantal, Leuraud, Klervi, Nathalie, Velly, Zins, Marie, Laboratoire d épidémiologie des rayonnements ionisants (IRSN/PSE-SANTE/SESANE/LEPID), Service de recherche sur les effets biologiques et Sanitaires des rayonnements ionisants (IRSN/PSE-SANTE/SESANE), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Pôle Santé Environnement- Direction Environnement (IRSN/PSE-ENV), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire d'évaluation de la dose interne (IRSN/PSE-SANTE/SDOS/LEDI), Service de dosimétrie (IRSN/PSE-SANTE/SDOS), Bureau d'expertise en radioprotection de la population (IRSN/PSE-ENV/SEREN/BERAP), Service d'expertise et d'étude en radioprotection des populations et de la radioactivité dans l'environnement (IRSN/PSE-ENV/SEREN), Unité d'expertise en radioprotection médicale (IRSN/PSE-SANTE/SER/UEM), Service d'études et d'expertise en radioprotection (IRSN/PSE-SANTE/SER), Bureau d'étude et d'expertise du radon (IRSN/PSE-ENV/SEREN/BERAD), Laboratoire d'écotoxicologie des radionucléides (IRSN/PSE-ENV/SRTE/LECO), Service de recherche sur les transferts et les effets des radionucléides sur les écosystèmes (IRSN/PSE-ENV/SRTE), Laboratoire de radiotoxicologie et radiobiologie expérimentale (IRSN/PSE-SANTE/SESANE/LRTOX), Cohortes épidémiologiques en population (CONSTANCES), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris-Saclay-Université Paris Cité (UPCité), Institut National de l'Environnement Industriel et des Risques (INERIS), Laboratoire de dosimétrie des rayonnements ionisants (IRSN/PSE-SANTE/SDOS/LDRI), Laboratoire d'étude et d'expertise sur la radioactivité de l'environnement (IRSN/PSE-ENV/SEREN/LEREN), Bureau d'analyse et de suivi des expositions professionnelles (IRSN/PSE-SANTE/SER/BASEP), Biostatistique, traitement et modélisation des données biologiques = Biostatistic, Biological Data treatment and Modelisation (BioSTM - URP_7537), Université Paris Cité (UPCité), Fondation de France (grant WB-2020-29711) French Agency for Food, Environmental and Occupational Health & Safety (ANSES, grant EST-21-188), European Radiation Protection Week, and European Project: 900009,RadoNorm
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[SDV]Life Sciences [q-bio] - Abstract
International audience
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- 2022
18. The in vitro PIG-A gene mutation assay: glycosylphosphatidylinositol (GPI)-related genotype-to-phenotype relationship in TK6 cells
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Krüger, Christopher T., Fischer, Bettina M., Armant, Olivier, Morath, Volker, Strähle, Uwe, and Hartwig, Andrea
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- 2016
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19. Le projet LILAS : analyse de l’application des approches participatives sur les multi-expositions environnementales et les risques chroniques
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Laurent, Olivier, Carrejo Gironza, Yara, Ancelet, Sophie, Armant, Olivier, Bard, Denis, Baumgartner, Katia, Bortoli, Sylvie, Boudet, Céline, Chamaret, Philippe, Chartier, Michel, Cormier, Stéphanie, David, Arthur, Desqueyroux, Hélène, Gerber, Mariette, Gilbin, Rodolphe, Grimbuhler, Sonia, Grison, Stephane, Larqué, Lionel, Laurier, Dominique, Mougin, Christian, Gamet-Payrastre, Laurence, Rannou, Alain, Vanzemberg, Arnaud, Schraub, Simon, Supervil, Sylvie, Thybaud, Eric, Trousse, Brigitte, Charron, Sylvie, Laboratoire d épidémiologie des rayonnements ionisants (IRSN/PSE-SANTE/SESANE/LEPID), Service de recherche sur les effets biologiques et Sanitaires des rayonnements ionisants (IRSN/PSE-SANTE/SESANE), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire d'écotoxicologie des radionucléides (IRSN/PSE-ENV/SRTE/LECO), Service de recherche sur les transferts et les effets des radionucléides sur les écosystèmes (IRSN/PSE-ENV/SRTE), Société francophone de santé environnement (SFSE), France Nature Environnement (FNE), Toxicité environnementale, cibles thérapeutiques, signalisation cellulaire (T3S - UMR_S 1124), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut National de l'Environnement Industriel et des Risques (INERIS), Institut Ecocitoyen pour la Connaissance des Pollutions [Fos-sur-Mer], Service d'expertise et d'étude en radioprotection des populations et de la radioactivité dans l'environnement (IRSN/PSE-ENV/SEREN), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Centre Permanent d'Initiatives pour l'Environnement des Pays de l'Aisne (CPIE des Pays de l'Aisne), EHESP-Irset (EHESP-Irset), École des Hautes Études en Santé Publique [EHESP] (EHESP), Agence de l'Environnement et de la Maîtrise de l'Energie (ADEME), Association nationale des comités et commissions locales d'information [Teteghem] (ANCCLI), Technologies et Méthodes pour les Agricultures de demain (UMR ITAP), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Alliance Sciences-Société, Ecologie fonctionnelle et écotoxicologie des agroécosystèmes (ECOSYS), AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Toxicologie Intégrative & Métabolisme (ToxAlim-TIM), ToxAlim (ToxAlim), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INPT - EI Purpan), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Pôle Santé Environnement - Direction Santé (IRSN/PSE-SANTE), Service des politiques d’ouverture à la société (IRSN/DST/SPOS), Direction de la Stratégie (IRSN/DST), Service de la programmation, des partenariats, de la prospective et de l’appui à l’innovation (IRSN/DST/SP3IN), Ligue Nationale Contre le Cancer (LNCC), Direction des Risques et de la Performance (IRSN/DRP), Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria), IRSN2030, Université de Toulouse (UT)-Ecole d'Ingénieurs de Purpan (INP - PURPAN), Laboratoire d'écotoxicologie des radionucléides (IRSN/PRP-ENV/SERIS/LECO), Service de Recherche et d'Expertise sur les Risques environnementaux (IRSN/PRP-ENV/SERIS), Institut National de la Santé et de la Recherche Médicale (INSERM), Institut de recherche en santé, environnement et travail (Irset), Université d'Angers (UA)-Université de Rennes (UR)-École des Hautes Études en Santé Publique [EHESP] (EHESP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Département des sciences en santé environnementale (DEESSE), Information – Technologies – Analyse Environnementale – Procédés Agricoles (UMR ITAP), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro, Laboratoire de radiotoxicologie et radiobiologie expérimentale (IRSN/PSE-SANTE/SESANE/LRTOX), ALLISS Sciences Sociétés [Paris], and Ligue Nationale Contre le Cancer - Paris
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méthodes en santé-environ- multiple exposure ,Laboratoire viavant ,Méthodes en santé-environnement ,multi-expositions ,Methods in environmental health research ,Analysis tools ,co-construction ,Multiple exposures ,analysis tool ,[SDE]Environmental Sciences ,participatory research ,Living Lab ,Grille d'analyse ,methods in environmental health ,recherches participatives - Abstract
International audience; Context: Participatory research in environmental health remains rare in France. The objectives of environmental health research projects can, like their methods, be very diverse. Opportunities for greater involvement of civil society, as well as its challenges, differ at each step of such research activities. All these aspects need to be widely shared. As a preparatory step toward the development of concrete new participatory research projects on multiple environmental exposures, the LILAS project aimed to (1) favor the mutual understanding of the main issues and research methods in environmental health and their stakes for different participants, but also the requirements, strengths, and limitations of these methods, and (2) identify the expected benefits and points to watch out for related to stronger civic participation in these projects.Methods: The LILAS project identified and gathered together institutional researchers, academics and civil society participants (mainly from nongovernmental organizations) interested in multiple exposures (chemical and radiological). The relevant literature was searched to learn from previous participatory research projects in this broad field. Several meetings enabled the group to collectively identify different types of studies and analyze the benefits, limitations and methods related to the introduction of such participation. An analysis matrix was co-constructed and completed by study participants, as in a Living Lab approach.Results: The matrix lists for different types of studies (assessment of environmental exposures, identification of their determinants, interventions on these exposures, quantitative risk assessment, epidemiological studies, experimental research, ecosystem health, etc.) the expected benefits for several categories of stakeholders, the fundamental principles of research methods, and their related practical constraints, advantages and limitations related to the use of participatory or more standard approaches.Conclusion: The LILAS project enabled the development of a solid basis for the co-construction of participatory research projects to study multiple environmental exposures.; Contexte : Les recherches participatives en santé-environnement restent encore peu développées en France. Les objectifs poursuivis par les recherches en santé-environnement (par exemple : estimer des expositions et/ou des effets, tester des actions préventives) et les méthodes employées à ces fins sont variées. Les opportunités d’une plus grande implication de la société civile et les défis associés diffèrent à chaque étape de ces recherches. Ces aspects demandent à être mieux appréhendés collectivement. Le projet LILAS visait, en amont du développement de futurs projets concrets de recherches participatives sur les multi-expositions environnementales, à (1) favoriser une bonne compréhension commune des principales problématiques et méthodes de recherche en santé-environnement, de leurs enjeux, prérequis, forces et limites, et à (2) identifier les bénéfices et points de vigilance liés à l’introduction de plus fortes dimensions participatives dans ces recherches.Méthode adoptée : Le projet LILAS a identifié et rassemblé des chercheurs institutionnels, académiques et acteurs de la société civile (associations loi 1901) intéressés par les multi-expositions (chimiques, radiologiques). Cinq réunions ont permis d’identifier collectivement différents types d’études et de réfléchir sur les apports, limites et prérequis méthodologiques relatifs à l’introduction de différents degrés de participation dans celles-ci. Une matrice résumant ces aspects a été co-construite puis alimentée par les participants, en s’inspirant des approches Living Lab (soit laboratoire vivant).Résultats : Pour différents types d’études (études d’estimations d’expositions, d’interventions sur celles-ci, évaluations de risques sanitaires, études épidémiologiques, expérimentales, études sur la santé des écosystèmes, etc.), la matrice élaborée en commun liste les bénéfices attendus pour différentes parties prenantes, les principes fondamentaux des méthodes employées et contraintes pratiques associées, les avantages et limites relatifs à l’emploi d’approches participatives (notamment les Living Labs) ou plus « classiques ».Conclusion : Le projet LILAS a permis de poser des bases consolidées pour la co-construction de projets de recherches participatives sur les multi-expositions environnementales.
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- 2022
20. Radiological component of the Exposome, multiple exposures, risks of cancer and other chronic diseases in the Constances cohort (CORALE)
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LAURENT, Olivier, Renaud, Philippe, Dreuil, Serge, Greau, Claire, Vignaud, Caroline, Ancelet, Sophie, Armant, Olivier, Bernier, Marie-Odile, Clero, Enora, Durand, Christelle, Ebrahimian Chiusa, Teni, Goldberg, Marcel, Lequy, Emeline, Grison, Stephane, Ibanez, Chrystelle, Ielsch, Géraldine, Klokov, Dmitry, Monceau, V., Roy, Herve, Guihenneuc, Chantal, Leuraud, Klervi, Zins., Marie, Laboratoire d épidémiologie des rayonnements ionisants (IRSN/PSE-SANTE/SESANE/LEPID), Service de recherche sur les effets biologiques et Sanitaires des rayonnements ionisants (IRSN/PSE-SANTE/SESANE), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Pôle Santé Environnement- Direction Environnement (IRSN/PSE-ENV), Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Unité d'expertise en radioprotection médicale (IRSN/PSE-SANTE/SER/UEM), Service d'études et d'expertise en radioprotection (IRSN/PSE-SANTE/SER), Bureau d'étude et d'expertise du radon (IRSN/PSE-ENV/SEREN/BERAD), Service d'expertise et d'étude en radioprotection des populations et de la radioactivité dans l'environnement (IRSN/PSE-ENV/SEREN), Laboratoire d'écotoxicologie des radionucléides (IRSN/PSE-ENV/SRTE/LECO), Service de recherche sur les transferts et les effets des radionucléides sur les écosystèmes (IRSN/PSE-ENV/SRTE), Laboratoire de radiotoxicologie et radiobiologie expérimentale (IRSN/PSE-SANTE/SESANE/LRTOX), Cohortes épidémiologiques en population (CONSTANCES), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris-Saclay-Université Paris Cité (UPCité), Bureau d'analyse et de suivi des expositions professionnelles (IRSN/PSE-SANTE/SER/BASEP), Biostatistique, traitement et modélisation des données biologiques = Biostatistic, Biological Data treatment and Modelisation (BioSTM - URP_7537), Université Paris Cité (UPCité), Fondation de France, Radonorm, and European Project: 900009,RadoNorm
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[SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie - Abstract
International audience; ContextThe whole population is exposed throughout its life to ionizing radiation (IR) at varying levels, via multiple natural and artificial sources, whether in the context of the residential environment, various activities (professional or other such as air travel) or for medical reasons (diagnostic or therapeutic procedures). The carcinogenic effects of IR are well documented at dose levels of 100 milliGrays (mGy) or higher. There is still controversy about the shape of the relationships between exposure and cancer risks at lower doses, called “low doses”. In addition, quantification of the effects of multi-exposure to IR and other cancer risk factors is poorly documented, with the exception of the interaction between tobacco and radon on lung cancer risk. Similarly, the relationships between exposures to IR at different stages of life (e.g., during childhood, puberty, etc.) and late health effects remain poorly characterized. Potential associations between low doses of IR and non-cancer chronic diseases also require better documentation. ObjectivesThe first objective of the CORALE project is to carry out the broadest possible reconstruction of doses of IR from environmental sources (radon, terrestrial and cosmic radiation, food, nuclear installations and other artificial sources), medical (diagnostic and therapeutic procedures) and occupational (nuclear workers but also other industries using radioactive sources, health professionals… ) received by participants in the Constances cohort since birth, following the logic of the exposome concept (for its radiological component). The second objective will be to estimate the risks of cancers and other chronic diseases potentially associated with the cumulative doses received (from several sources of IR and over time) taking into account the potential influence of the context of multi-exposures to other risk factors.MethodsIn order to reconstruct the annual doses due to radioactivity of natural and artificial origin received by each member of the Constances cohort since their birth, a large number of sources of radioactivity must be considered. Reconstructions related to environmental, medical and occupational exposures will be performed by different units of the IRSN in collaboration with the Constances cohort team. To do this, a questionnaire will be sent to cohort members who have already provided their residential histories. The statistical analyses (e.g., Cox models with time-dependent covariates) will be carried out at the IRSN epidemiology laboratory and will benefit from the expertise of radiobiologists, supporting the exploration of specific hypotheses and interpretations. The use of innovative regression methods on exposure profiles will be explored in collaboration with the University of Paris.PerspectivesCORALE is part of a broader long-term research programme, which will include the effects of other multi-exposures (e.g., IR and other environmental exposures) and the study of risk and exposure biomarkers through the Constances biobank, further complementing the application of the exposome concept through the study of within-body regulations following exposures. This program will help improve the characterization of the exposome and its relation with chronic diseases in the Constances cohort.
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- 2021
21. Two independent transcription initiation codes overlap on vertebrate core promoters
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Haberle, Vanja, Li, Nan, Hadzhiev, Yavor, Plessy, Charles, Previti, Christopher, Nepal, Chirag, Gehrig, Jochen, Dong, Xianjun, Akalin, Altuna, Suzuki, Ana Maria, van IJcken, Wilfred F.J., Armant, Olivier, Ferg, Marco, Strahle, Uwe, Carninci, Piero, Muller, Ferenc, and Lenhard, Boris
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Genetic research ,Promoters (Genetics) -- Research ,Genetic code -- Research ,Genetic transcription -- Research ,Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
A core promoter is a stretch of DNA surrounding the transcription start site (TSS) that integrates regulatory inputs (1) and recruits general transcription factors to initiate transcription (2). The nature and causative relationship of the DNA sequence and chromatin signals that govern the selection of most TSSs by RNA polymerase II remain unresolved. Maternal to zygotic transition represents the most marked change of the transcriptome repertoire in the vertebrate life cycle (3-6). Early embryonic development in zebrafish is characterized by a series of transcriptionally silent cell cycles regulated by inherited maternal gene products: zygotic genome activation commences at the tenth cell cycle, marking the mid-blastula transition (7). This transition provides a unique opportunity to study the rules of TSS selection and the hierarchy of events linking transcription initiation with key chromatin modifications. We analysed TSS usage during zebrafish early embryonic development at high resolution using cap analysis of gene expression (8), and determined the positions of H3K4me3-marked promoter-associated nucleosomes (9). Here we show that the transition from the maternal to zygotic transcriptome is characterized by a switch between two fundamentally different modes of defining transcription initiation, which drive the dynamic change of TSS usage and promoter shape. A maternal-specific TSS selection, which requires an A/T-rich (W-box) motif, is replaced with a zygotic TSS selection grammar characterized by broader patterns of dinucleotide enrichments, precisely aligned with the first downstream (11) nucleosome. The developmental dynamics of the H3K4me3-marked nucleosomes reveal their DNA-sequence-associated positioning at promoters before zygotic transcription and subsequent transcription-independent adjustment to the final position downstream of the zygotic TSS. The two TSS-defining grammars coexist, often physically overlapping, in core promoters of constitutively expressed genes to enable their expression in the two regulatory environments. The dissection of overlapping core promoter determinants represents a framework for future studies of promoter structure and function across different regulatory contexts., Mapping of TSSs using cap analysis of gene expression (CAGE) (8) identified two major promoter classes with respect to TSS precision (10,11): 'sharp' promoters with one predominant TSS, often associated [...]
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- 2014
22. Radiation adverse outcome pathways (AOPs) are on the horizon: advancing radiation protection through an international Horizon-Style exercise.
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Burtt, Julie J., Leblanc, Julie, Randhawa, Kristi, Ivanova, Addie, Rudd, Murray A., Wilkins, Ruth, Azzam, Edouard I., Hecker, Markus, Horemans, Nele, Vandenhove, Hildegarde, Adam-Guillermin, Christelle, Armant, Olivier, Klokov, Dmitry, Audouze, Karine, Kaiser, Jan Christian, Moertl, Simone, Lumniczky, Katalin, Tanaka III, Ignacia B., Yamada, Yutaka, and Hamada, Nobuyuki
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RADIATION protection ,DOSE-response relationship (Radiation) ,NUCLEAR energy ,RADIATION ,ENERGY development - Abstract
The Adverse Outcome Pathway (AOP) framework, a systematic tool that can link available mechanistic data with phenotypic outcomes of relevance to regulatory decision-making, is being explored in areas related to radiation risk assessment. To examine the challenges including the use of AOPs to support the radiation protection community, an international horizon-style exercise was initiated through the Organisation for Economic Co-operation and Development Nuclear Energy Agency High-Level Group on Low Dose Research Radiation/Chemical AOP Joint Topical Group. The objective of the HSE was to facilitate the collection of ideas from a range of experts, to short-list a set of priority research questions that could, if answered, improve the description of the radiation dose-response relationship for low dose/dose-rate exposures, as well as reduce uncertainties in estimating the risk of developing adverse health outcomes following such exposures. The HSE was guided by an international steering committee of radiation risk experts. In the first phase, research questions were solicited on areas that can be supported by the AOP framework, or challenges on the use of AOPs in radiation risk assessment. In the second phase, questions received were refined and sorted by the SC using a best-worst scaling method. During a virtual 3-day workshop, the list of questions was further narrowed. In the third phase, an international survey of the broader radiation protection community led to an orderly ranking of the top questions. Of the 271 questions solicited, 254 were accepted and categorized into 9 themes. These were further refined to the top 25 prioritized questions. Among these, the higher ranked questions will be considered as 'important' to drive future initiatives in the low dose radiation protection community. These included questions on the ability of AOPs to delineate responses across different levels of biological organization, and how AOPs could be applied to address research questions on radiation quality, doses or dose-rates, exposure time patterns and deliveries, and uncertainties in low dose/dose-rate effects. A better understanding of these concepts is required to support the use of the AOP framework in radiation risk assessment. Through dissemination of these results and considerations on next steps, the JTG will address select priority questions to advance the development and use of AOPs in the radiation protection community. The major themes observed will be discussed in the context of their relevance to areas of research that support the system of radiation protection. [ABSTRACT FROM AUTHOR]
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- 2022
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23. Development of an adverse outcome pathway for radiation-induced microcephaly via expert consultation and machine learning.
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Jaylet, Thomas, Quintens, Roel, Benotmane, Mohamed Abderrafi, Luukkonen, Jukka, Tanaka III, Ignacia Braga, Ibanez, Chrystelle, Durand, Christelle, Sachana, Magdalini, Azimzadeh, Omid, Adam-Guillermin, Christelle, Tollefsen, Knut Erik, Laurent, Olivier, Audouze, Karine, and Armant, Olivier
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MACHINE learning ,MICROCEPHALY ,SCIENTIFIC knowledge ,IONIZING radiation ,SIZE of brain ,TOXICOLOGICAL interactions - Abstract
Brain development during embryogenesis and in early postnatal life is particularly complex and involves the interplay of many cellular processes and molecular mechanisms, making it extremely vulnerable to exogenous insults, including ionizing radiation (IR). Microcephaly is one of the most frequent neurodevelopmental abnormalities that is characterized by small brain size, and is often associated with intellectual deficiency. Decades of research span from epidemiological data on in utero exposure of the A-bomb survivors, to studies on animal and cellular models that allowed deciphering the most prominent molecular mechanisms leading to microcephaly. The Adverse Outcome Pathway (AOP) framework is used to organize, evaluate and portray the scientific knowledge of toxicological effects spanning different biological levels of organizations, from the initial interaction with molecular targets to the occurrence of a disease or adversity. In the present study, the framework was used in an attempt to organize the current scientific knowledge on microcephaly progression in the context of ionizing radiation (IR) exposure. This work was performed by a group of experts formed during a recent workshop organized jointly by the Multidisciplinary European Low Dose Initiative (MELODI) and the European Radioecology Alliance (ALLIANCE) associations to present the AOP approach and tools. Here we report on the development of a putative AOP for congenital microcephaly resulting from IR exposure based on discussions of the working group and we emphasize the use of a novel machine-learning approach to assist in the screening of the available literature to develop AOPs. The expert consultation led to the identification of crucial biological events for the progression of microcephaly upon exposure to IR, and highlighted current knowledge gaps. The machine learning approach was successfully used to screen the existing knowledge and helped to rapidly screen the body of evidence and in particular the epidemiological data. This systematic review approach also ensured that the analysis was sufficiently comprehensive to identify the most relevant data and facilitate rapid and consistent AOP development. We anticipate that as machine learning approaches become more user-friendly through easy-to-use web interface, this would allow AOP development to become more efficient and less time consuming. [ABSTRACT FROM AUTHOR]
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- 2022
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24. Comprehensive expression map of transcription regulators in the adult zebrafish telencephalon reveals distinct neurogenic niches
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Diotel, Nicolas, Viales, Rebecca Rodriguez, Armant, Olivier, März, Martin, Ferg, Marco, Rastegar, Sepand, and Strähle, Uwe
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- 2015
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25. Male frequency in Caenorhabditis elegans increases in response to chronic irradiation.
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Quevarec, Loïc, Réale, Denis, Dufourcq‐Sekatcheff, Elizabeth, Car, Clément, Armant, Olivier, Dubourg, Nicolas, Adam‐Guillermin, Christelle, and Bonzom, Jean‐Marc
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CAENORHABDITIS elegans ,CAENORHABDITIS ,RADIOACTIVE pollution ,IONIZING radiation ,SEX ratio ,MALES - Abstract
Outcrossing can be advantageous in a changing environment because it promotes the purge of deleterious mutations and increases the genetic diversity within a population, which may improve population persistence and evolutionary potential. Some species may, therefore, switch their reproductive mode from inbreeding to outcrossing when under environmental stress. This switch may have consequences on the demographic dynamics and evolutionary trajectory of populations. For example, it may directly influence the sex ratio of a population. However, much remains to be discovered about the mechanisms and evolutionary implications of sex ratio changes in a population in response to environmental stress. Populations of the androdioecious nematode Caenorhabditis elegans, are composed of selfing hermaphrodites and rare males. Here, we investigate the changes in the sex ratio of C. elegans populations exposed to radioactive pollution for 60 days or around 20 generations. We experimentally exposed populations to three levels of ionizing radiation (i.e., 0, 1.4, and 50 mGy.h−1). We then performed reciprocal transplant experiments to evaluate genetic divergence between populations submitted to different treatments. Finally, we used a mathematical model to examine the evolutionary mechanisms that could be responsible for the change in sex ratio. Our results showed an increase in male frequency in irradiated populations, and this effect increased with the dose rate. The model showed that an increase in male fertilization success or a decrease in hermaphrodite self‐fertilization could explain this increase in the frequency of males. Moreover, males persisted in populations after transplant back into the control conditions. These results suggested selection favoring outcrossing under irradiation conditions. This study shows that ionizing radiation can sustainably alter the reproductive strategy of a population, likely impacting its long‐term evolutionary history. This study highlights the need to evaluate the impact of pollutants on the reproductive strategies of populations when assessing the ecological risks. [ABSTRACT FROM AUTHOR]
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- 2022
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26. Proteome dynamics in neutrophils of adult zebrafish upon chemically-induced inflammation
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Singh, Sachin Kumar, Aravamudhan, Sriram, Armant, Olivier, Krüger, Marcus, and Grabher, Clemens
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- 2014
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27. Gene transcription in the zebrafish embryo: regulators and networks
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Ferg, Marco, Armant, Olivier, Yang, Lixin, Dickmeis, Thomas, Rastegar, Sepand, and Strähle, Uwe
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- 2014
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28. Neurogenin 2 controls cortical neuron migration through regulation of Rnd2
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Heng, Julian Ik-Tsen, Nguyen, Laurent, Castro, Diogo S., Zimmer, Celine, Wildner, Hendrik, Armant, Olivier, Skowronska-Krawczyk, Dorota, Bedogni, Francesco, Matter, Jean-Marc, Hevner, Robert, and Guillemot, Francois
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Cerebral cortex -- Research -- Physiological aspects ,Binding proteins -- Research -- Physiological aspects ,Neurons -- Research -- Physiological aspects ,Cell migration -- Research -- Physiological aspects ,Environmental issues ,Science and technology ,Zoology and wildlife conservation ,Physiological aspects ,Research - Abstract
Motility is a universal property of newly generated neurons. How cell migration is coordinately regulated with other aspects of neuron production is not well understood. Here we show that the [...]
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- 2008
29. A systems biology approach reveals neuronal and muscle developmental defects after chronic exposure to ionising radiation in zebrafish
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Murat El Houdigui, Sophia, Adam-Guillermin, Christelle, Loro, Giovanna, Arcanjo, Caroline, Frelon, Sandrine, Floriani, Magali, Dubourg, Nicolas, Baudelet, Emilie, Audebert, Stéphane, Camoin, Luc, Armant, Olivier, PSE-ENV/SRTE/LECO, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-SANTE/SDOS/LMDN, Centre de Recherche en Cancérologie de Marseille (CRCM), Aix Marseille Université (AMU)-Institut Paoli-Calmettes, Fédération nationale des Centres de lutte contre le Cancer (FNCLCC)-Fédération nationale des Centres de lutte contre le Cancer (FNCLCC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Luc, Camoin, Laboratoire d'écotoxicologie des radionucléides (IRSN/PSE-ENV/SRTE/LECO), Service de recherche sur les transferts et les effets des radionucléides sur les écosystèmes (IRSN/PSE-ENV/SRTE), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Laboratoire de micro-irradiation, de métrologie et de dosimétrie neutrons (IRSN/PSE-SANTE/SDOS/LMDN), and Service de dosimétrie (IRSN/PSE-SANTE/SDOS)
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[SDV]Life Sciences [q-bio] ,Systems analysis ,Embryonic Development ,lcsh:Medicine ,Antineoplastic Agents ,Tretinoin ,Muscle Development ,Nervous System ,Article ,Radiation, Ionizing ,[SDV.BBM.GTP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN] ,[SDV.BBM] Life Sciences [q-bio]/Biochemistry, Molecular Biology ,Animals ,[SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology ,Transcriptomics ,lcsh:Science ,Zebrafish ,[SDV.EE]Life Sciences [q-bio]/Ecology, environment ,Muscles ,Systems Biology ,lcsh:R ,Zebrafish Proteins ,[SDV] Life Sciences [q-bio] ,[SDV.EE] Life Sciences [q-bio]/Ecology, environment ,Larva ,Embryogenesis ,[SDV.BBM.GTP] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN] ,lcsh:Q ,Transcriptome ,Transcription Factors - Abstract
International audience; contamination of the environment after the chernobyl and fukushima Daiichi nuclear power plant (npp) disasters led to the exposure of a large number of humans and wild animals to radioactive substances. However, the sub-lethal consequences induced by these absorbed radiological doses remain understudied and the long-term biological impacts largely unknown. We assessed the biological effects of chronic exposure to ionizing radiation (IR) on embryonic development by exposing zebrafish embryo from fertilization and up to 120 hours post-fertilization (hpf) at dose rates of 0.5 mGy/h, 5 mGy/h and 50 mGy/h, thereby encompassing the field of low dose rates defined at 6 mGy/h. Chronic exposure to IR altered larval behaviour in a light-dark locomotor test and affected cardiac activity at a dose rate as low as 0.5 mGy/h. The multi-omics analysis of transcriptome, proteome and transcription factor binding sites in the promoters of the deregulated genes, collectively points towards perturbations of neurogenesis, muscle development, and retinoic acid (RA) signaling after chronic exposure to iR. Whole-mount RnA in situ hybridization confirmed the impaired expression of the transcription factors her4.4 in the central nervous system and myogenin in the developing muscles of exposed embryos. At the organ level, the assessment of muscle histology by transmission electron microscopy (TEM) demonstrated myofibers disruption and altered neuromuscular junctions in exposed larvae at 5 mGy/h and 50 mGy/h. The integration of these multi-level data demonstrates that chronic exposure to low dose rates of iR has an impact on neuronal and muscle progenitor cells, that could lead to motility defects in free swimming larvae at 120 hpf. The mechanistic understanding of these effects allows us to propose a model where deregulation of RA signaling by chronic exposure to IR has pleiotropic effects on neurogenesis and muscle development.
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- 2019
30. Fishing for melanoma markers through comparative transcriptome analysis
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Mione, Marina and Armant, Olivier
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- 2012
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31. Unusual evolution of tree frog populations in the Chernobyl exclusion zone.
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Car, Clément, Gilles, André, Armant, Olivier, Burraco, Pablo, Beaugelin‐Seiller, Karine, Gashchak, Sergey, Camilleri, Virginie, Cavalié, Isabelle, Laloi, Patrick, Adam‐Guillermin, Christelle, Orizaola, Germán, and Bonzom, Jean‐Marc
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FROG populations ,HYLIDAE ,NUCLEAR power plant accidents ,IONIZING radiation ,HAPLOTYPES ,RADIOACTIVE contamination ,NUCLEAR power plants - Abstract
Despite the ubiquity of pollutants in the environment, their long‐term ecological consequences are not always clear and still poorly studied. This is the case concerning the radioactive contamination of the environment following the major nuclear accident at the Chernobyl nuclear power plant. Notwithstanding the implications of evolutionary processes on the population status, few studies concern the evolution of organisms chronically exposed to ionizing radiation in the Chernobyl exclusion zone. Here, we examined genetic markers for 19 populations of Eastern tree frog (Hyla orientalis) sampled in the Chernobyl region about thirty years after the nuclear power plant accident to investigate microevolutionary processes ongoing in local populations. Genetic diversity estimated from nuclear and mitochondrial markers showed an absence of genetic erosion and higher mitochondrial diversity in tree frogs from the Chernobyl exclusion zone compared to other European populations. Moreover, the study of haplotype network permitted us to decipher the presence of an independent recent evolutionary history of Chernobyl exclusion zone's Eastern tree frogs caused by an elevated mutation rate compared to other European populations. By fitting to our data a model of haplotype network evolution, we suspected that Eastern tree frog populations in the Chernobyl exclusion zone have a high mitochondrial mutation rate and small effective population sizes. These data suggest that Eastern tree frog populations might offset the impact of deleterious mutations because of their large clutch size, but also question the long‐term impact of ionizing radiation on the status of other species living in the Chernobyl exclusion zone. [ABSTRACT FROM AUTHOR]
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- 2022
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32. Effect of chronic low doses of ionizing radiations on central nervous system development of zebrafish
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Loro, Giovana, Murat El Houdigui, Sophia, DUBOURG, Nicolas, DELLA-VEDOVA, CLAIRE, BENADJAOUD, Mohamedamine, Adam-Guillermin, Christelle, ARMANT, Olivier, PSE-ENV/SRTE/LECO, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV/SRTE/LRTA, and PSE-SANTE/SERAMED
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[SDV]Life Sciences [q-bio] - Abstract
International audience; After the nuclear accidents at Chernobyl and Fukushima and due to a growing use of radionuclides, radiation protection of the environment is a major concern. Studies show an increased sensitivity to ionizing radiation (IR) during development. However, there are few data on the molecular mechanisms leading to the effects of IR on embryogenesis and moreover for chronic exposures. In this context, the objective of this thesis is to better understand the effects of exposure to IR on the development of zebrafish (Danio rerio), a model organism in ecotoxicology and in biomedicine. Fertilized eggs were exposed to gamma rays emitted by a 137Cs source at low to moderate dose rates (from 0.005 mGy/h to 50 mGy/h), then analysed from the gastrula stage (6 hours) to the larval stage (5 days) by an integrative approach from molecular effects to behavioural effects. Part of this work has focused on studying the effects of IR at an early stage of zebrafish development after exposure to IR. For this, a multi-omics approach with the study of the transcriptome and the methylome has been implemented. A transcriptomic study at the shield stage with dose rates ranging from 0.005 mGy/h to 50 mGy/h was carried out and demonstrated a moderate but significant effect on the regulation of oxidative stress and mitochondrial activity. At 5 and 50 mGy/h, the genes involved in the development of the central nervous system (CNS) and muscles are affected. The methylome study has revealed hypomethylation of the promoter sequences of genes involved in the development of the CNS and muscles, associated with a modification of gene expression. These results on early embryonic stages, highlight potential effects on the development of the CNS and muscles. The other part of this work focused on assessing the effects of IR exposure at later developmental stages using a system biology approach. For this, analyses were carried out from the molecular scale to the phenotypic scale. At the molecular level, a multi-omics analysis of the transcriptome and the proteome has highlighted the modulation of genes involved in the retinoic acid pathway, the development of the CNS and muscles in embryos and larvae exposed to 0.5; 5 and 50 mGy/h. Labelling by in-situ hybridization confirmed the misregulation of the transcription factors her4.4 in the CNS and myog in the muscles of embryos exposed to IR. At the tissue level, disruption of muscle myofibrils and alteration of neuromuscular junctions are detected in embryos exposed to 5 and 50 mGy/h. In order to assess an individual effect at phenotypic scale, the locomotor behaviour of the larvae was assessed under stress conditions. A significant decrease in larval motility was detected between 0.5 mGy/h and 50 mGy/h. This work has shown effects of IR on the development of the CNS and muscles from early development at the molecular level. These effects are confirmed at later stages of development. This study suggests that the molecular disturbances observed during early development are predictive of the effects observed at later developmental stages. In addition, this thesis work allows us to propose a model of "Adverse Outcome Pathway" where the deregulation of the retinoic acid pathway by exposure to IR will lead to effects on the development of the CNS and muscles.
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- 2019
33. Epigenetic modifications as a molecular mechanism for transgenerational effects in Daphnia exposed to ionising radiation
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TRIJAU, Marie, ASSELMAN, Jana, ARMANT, Olivier, Adam-Guillermin, Christelle, De Schamphelaere, Karel, ALONZO, Frederic, Ibacon GmbH, Ghent University, PSE-ENV/SRTE/LECO, and Institut de Radioprotection et de Sûreté Nucléaire (IRSN)
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[SDE]Environmental Sciences - Abstract
International audience; In order to predict long term consequences of pollution on wildlife, toxic effects have to be assessed on a multigenerational scale. DEBtox models were recently developped to analyze effects of alpha and gamma radiation over several generations of Daphnia magna. A transgenerational damage compartement which level is transmitted from parent to offspring, was used to account for changes in effect severity observed among generations. However, the nature of molecular mechanisms involved in the transmission of radio-induced damage accross generations are poorly understood. In this context, the role of epigenetic processes was recently investigated in D. magna, as part of the transgenerational response to external Cs-137 gamma irradiation (at dose rates of 6.5 µGy/h and 41.3 mGy/h). In this aim, we studied DNA methylation changes after a 25-day chronic exposure of a parental generation (F0) and their potential inheritance by subsequent recovering generations, including F2 (exposed as germ cells in F1 embryos) and F3 (the first truly unexposed generation). Effects on survival, growth and reproduction were examined in all generations and DNA was extracted for whole genome bisulfite sequencing. Results showed that effects on reproduction were significant in generation F0 at the high dose rate and absent in subsequent generations (F1, F2 and F3). In contrast, we detected significant DNA methylation changes in every generation independent of dose rate. Some of these changes were shared between dose rates and among generations. Involved genes included gene families and gene functions which were previously shown to play roles during exposure to ionising radiation. Common DNA methylation changes detected between generations F2 and F3 clearly showed that epigenetic modifications were transmitted to unexposed generations, most likely through the germline.
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- 2019
34. Multi-Dimensional Transcriptome Analysis Reveals Modulation of Cholesterol Metabolism as Highly Integrated Response to Brain Injury.
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Gourain, Victor, Armant, Olivier, Lübke, Luisa, Diotel, Nicolas, Rastegar, Sepand, and Strähle, Uwe
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CHOLESTEROL metabolism ,NERVOUS system regeneration ,BRAIN injuries ,LINCRNA ,GENETIC engineering ,HYDROXYCHOLESTEROLS ,INTRONS - Abstract
Zebrafish is an attractive model to investigate regeneration of the nervous system. Despite major progress in our understanding of the underlying processes, the transcriptomic changes are largely unknown. We carried out a computational analysis of the transcriptome of the regenerating telencephalon integrating changes in the expression of mRNAs, their splice variants and investigated the putative role of regulatory RNAs in the modulation of these transcriptional changes. Profound changes in the expression of genes and their splice variants engaged in many distinct processes were observed. Differential transcription and splicing are important processes in response to injury of the telencephalon. As exemplified by the coordinated regulation of the cholesterol synthesizing enzymes and transporters, the genome responded to injury of the telencephalon in a multi-tiered manner with distinct and interwoven changes in expression of enzymes, transporters and their regulatory molecules. This coordinated genomic response involved a decrease of the mRNA of the key transcription factor SREBF2, induction of microRNAs (miR-182 , miR-155 , miR-146 , miR-31) targeting cholesterol genes, shifts in abundance of splice variants as well as regulation of long non-coding RNAs. Cholesterol metabolism appears to be switched from synthesis to relocation of cholesterol. Based on our in silico analyses, this switch involves complementary and synergistic inputs by different regulatory principles. Our studies suggest that adaptation of cholesterol metabolism is a key process involved in regeneration of the injured zebrafish brain. [ABSTRACT FROM AUTHOR]
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- 2021
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35. Characterization of the proneural gene regulatory network during mouse telencephalon development
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Parker Joel S, Nguyen Laurent, Castro Diogo S, Zimmer Celine, Smith Marjolein V, Parham Frederick M, Armant Olivier, Gohlke Julia M, Gradwohl Gerard, Portier Christopher J, and Guillemot François
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Biology (General) ,QH301-705.5 - Abstract
Abstract Background The proneural proteins Mash1 and Ngn2 are key cell autonomous regulators of neurogenesis in the mammalian central nervous system, yet little is known about the molecular pathways regulated by these transcription factors. Results Here we identify the downstream effectors of proneural genes in the telencephalon using a genomic approach to analyze the transcriptome of mice that are either lacking or overexpressing proneural genes. Novel targets of Ngn2 and/or Mash1 were identified, such as members of the Notch and Wnt pathways, and proteins involved in adhesion and signal transduction. Next, we searched the non-coding sequence surrounding the predicted proneural downstream effector genes for evolutionarily conserved transcription factor binding sites associated with newly defined consensus binding sites for Ngn2 and Mash1. This allowed us to identify potential novel co-factors and co-regulators for proneural proteins, including Creb, Tcf/Lef, Pou-domain containing transcription factors, Sox9, and Mef2a. Finally, a gene regulatory network was delineated using a novel Bayesian-based algorithm that can incorporate information from diverse datasets. Conclusion Together, these data shed light on the molecular pathways regulated by proneural genes and demonstrate that the integration of experimentation with bioinformatics can guide both hypothesis testing and hypothesis generation.
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- 2008
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36. Adverse effects induced by chronic gamma irradiation in progeny of adult fish not affecting parental reproductive performance.
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Guirandy, Noémie, Gagnaire, Béatrice, Frelon, Sandrine, Munch, Thomas, Dubourg, Nicolas, Camilleri, Virginie, Cavalié, Isabelle, Floriani, Magali, Arcanjo, Caroline, Murat El Houdigui, Sophia, Armant, Olivier, Adam‐Guillermin, Christelle, Gonzalez, Patrice, and Simon, Olivier
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ECOLOGICAL risk assessment ,MATERNAL exposure ,IRRADIATION ,EXPOSURE dose ,FISH reproduction - Abstract
Multigenerational studies have become of great interest in ecotoxicology since the consequence of parental exposure to contaminants on offspring generations was established in situ or in laboratory conditions. The present study mainly examined the chronic effects of external Cs‐137 gamma irradiation exposure at 4 dose rates (control, 0.5, 5, and 50 mGy h–1) on adult zebrafish (F0) exposed for 10 d and their progeny (F1) exposed or unexposed for 4 to 5 d. The main endpoints investigated included parental reproductive performance, embryo‐larval survival, DNA alterations, and reactive oxygen species (ROS) production in F0 and F1. No effects on reproductive success, fecundity, or egg fertilization rate were observed. However, drastic effects were observed on F1 exposed to 50 mGy h–1, resulting in a mortality rate of 100%. The drastic effects were also observed when the progeny was not irradiated. It was demonstrated that the sensitivity of the embryos was mainly attributable to parental irradiation. Moreover, these drastic effects induced by adult irradiation disappeared over time when 10 d–irradiated adults were placed in a nonirradiated condition. Alterations in larval DNA were observed for the 3 dose rates, and an increase of ROS production was also shown for the 2 lowest dose rates. The present study improves our understanding of the consequences of parental exposure conditions to the progeny. Furthermore, it provides an incentive to take transmitted generational effects into account in ecological risk assessments. Environ Toxicol Chem 2019;38:2556–2567. © 2019 SETAC [ABSTRACT FROM AUTHOR]
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- 2019
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37. Molecular description of eye defects in the zebrafish Pax6b mutant, sunrise, reveals a Pax6b-dependent genetic network in the developing anterior chamber
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Takamiya, Masanari, Weger, Benjamin D., Schindler, Simone, Beil, Tanja, Yang, Lixin, Armant, Olivier, Ferg, Marco, Schlunck, Günther, Reinhard, Thomas, Dickmeis, Thomas, Rastegar, Sepand, and Strähle, Uwe
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Homeodomain Proteins ,PAX6 Transcription Factor ,genetic structures ,Anterior Chamber ,Gene Expression Profiling ,Science ,Endothelium, Corneal ,Gene Expression Regulation, Developmental ,Retina ,eye diseases ,Repressor Proteins ,Larva ,Mutation ,Animals ,Paired Box Transcription Factors ,Medicine ,Gene Regulatory Networks ,sense organs ,Eye Proteins ,Zebrafish ,Research Article - Abstract
The cornea is a central component of the camera eye of vertebrates and even slight corneal disturbances severely affect vision. The transcription factor PAX6 is required for normal eye development, namely the proper separation of the lens from the developing cornea and the formation of the iris and anterior chamber. Human PAX6 mutations are associated with severe ocular disorders such as aniridia, Peters anomaly and chronic limbal stem cell insufficiency. To develop the zebrafish as a model for corneal disease, we first performed transcriptome and in situ expression analysis to identify marker genes to characterise the cornea in normal and pathological conditions. We show that, at 7 days post fertilisation (dpf), the zebrafish cornea expresses the majority of marker genes (67/84 tested genes) found also expressed in the cornea of juvenile and adult stages. We also characterised homozygous pax6b mutants. Mutant embryos have a thick cornea, iris hypoplasia, a shallow anterior chamber and a small lens. Ultrastructure analysis revealed a disrupted corneal endothelium. pax6b mutants show loss of corneal epithelial gene expression including regulatory genes (sox3, tfap2a, foxc1a and pitx2). In contrast, several genes (pitx2, ctnnb2, dcn and fabp7a) were ectopically expressed in the malformed corneal endothelium. Lack of pax6b function leads to severe disturbance of the corneal gene regulatory programme.
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- 2015
38. Loss of ASAP1 in mice impairs adipogenic and osteogenic differentiation of mesenchymal progenitor cells through dysregulation of FAK/Src and AKT signaling.
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Schreiber, Caroline, Saraswati, Supriya, Harkins, Shannon, Gruber, Annette, Cremers, Natascha, Thiele, Wilko, Rothley, Melanie, Plaumann, Diana, Korn, Claudia, Armant, Olivier, Augustin, Hellmut G., and Sleeman, Jonathan P.
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PROGENITOR cells ,CELL migration ,CONNECTIVE tissue cells ,DEVELOPMENTAL biology ,ADAPTOR proteins ,ADIPOGENESIS - Abstract
ASAP1 is a multi-domain adaptor protein that regulates cytoskeletal dynamics, receptor recycling and intracellular vesicle trafficking. Its expression is associated with poor prognosis for a variety of cancers, and promotes cell migration, invasion and metastasis. Little is known about its physiological role. In this study, we used mice with a gene-trap inactivated ASAP1 locus to study the functional role of ASAP1 in vivo, and found defects in tissues derived from mesenchymal progenitor cells. Loss of ASAP1 led to growth retardation and delayed ossification typified by enlarged hypertrophic zones in growth plates and disorganized chondro-osseous junctions. Furthermore, loss of ASAP1 led to delayed adipocyte development and reduced fat depot formation. Consistently, deletion of ASAP1 resulted in accelerated chondrogenic differentiation of mesenchymal cells in vitro, but suppressed osteo- and adipogenic differentiation. Mechanistically, we found that FAK/Src and PI3K/AKT signaling is compromised in Asap1
GT /GT MEFs, leading to impaired adipogenic differentiation. Dysregulated FAK/Src and PI3K/AKT signaling is also associated with attenuated osteogenic differentiation. Together these observations suggest that ASAP1 plays a decisive role during the differentiation of mesenchymal progenitor cells. [ABSTRACT FROM AUTHOR]- Published
- 2019
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39. Tritiated water exposure disrupts myofibril structure and induces mis-regulation of eye opacity and DNA repair genes in zebrafish early life stages.
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Arcanjo, Caroline, Armant, Olivier, Floriani, Magali, Cavalie, Isabelle, Camilleri, Virginie, Simon, Olivier, Orjollet, Daniel, Adam-Guillermin, Christelle, and Gagnaire, Béatrice
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DEVELOPMENTAL toxicology , *ZEBRA danio , *RADIOISOTOPES & the environment , *MYOFIBRILS , *DNA repair , *OPACITY (Optics) , *TOXICOLOGY of water pollution , *PHYSIOLOGY - Abstract
Tritium ( 3 H) is a radioactive isotope of hydrogen. In the environment, the most common form of tritium is tritiated water (HTO). The present study aimed to identify early biomarkers of HTO contamination through the use of an aquatic model, the zebrafish ( Danio rerio ). We used the zebrafish embryo-larvae model to investigate the modes of action of HTO exposure at dose rates of 0.4 and 4 mGy/h, dose rates expected to induce deleterious effects on fish. Zebrafish were exposed to HTO from 3 hpf (hours post fertilization) to 96 hpf. The transcriptomic effects were investigated 24 h and 96 h after the beginning of the contamination, using mRNAseq. Results suggested an impact of HTO contamination, regardless of the dose rate, on genes involved in muscle contraction ( tnnt2d , tnni2a.4, slc6a1a or atp2a1l ) and eye opacity ( crygm2d9 , crygmxl1 , mipb or lim2.3 ) after 24 h of contamination. Interestingly, an opposite differential expression was highlighted in genes playing a role in muscle contraction and eye opacity in 24 hpf embryos when comparing dose rates, suggesting an onset of DNA protective mechanisms. The expression of h2afx and ddb2 involved in DNA repair was enhanced in response to HTO exposure. The entrainment of circadian clock and the response to H 2 O 2 signalling pathways were enriched at 96 hpf at 0.4 mGy/h and in both stages after 4 mGy/h. Genes involved in ROS scavenging were differentially expressed only after 24 h of exposure for the lowest dose rate, suggesting the onset of early protective mechanisms against oxidative stress. Effects highlighted on muscle at the molecular scale were confirmed at a higher biological scale, as electron microscopy observations revealed sarcomere impairments in 96 hpf larvae for both dose rates. Together with other studies, the present work provides useful data to better understand modes of action of tritium on zebrafish embryos-larvae. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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40. zHSF1 modulates zper2 expression in zebrafish embryos.
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Mennetrier, Lucas, Lopez, Tatiana, Pruvot, Benoist, Yousfi, Nadhir, Armant, Olivier, Hazhaz, Hanae, Lhuissiez, Vincent, Garrido, Carmen, and Chluba, Johanna
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CIRCADIAN rhythms ,EMBRYOS ,ZEBRA danio ,TRANSCRIPTION factors ,PROTEIN genetics - Abstract
HSF1 is a transcription factor that plays a key role in circadian resetting by temperature. We have used zebrafish embryos to decipher the roles of zHsf1, heat and light on zper2 transcription in vivo. Our results show that heat shock (HS) stimulated zper2 expression in the dark but has no cumulative effect combined with light. After light exposition, zper2 expression was 2.7 fold increased threefold in the hsf1-morphants in comparison to control embryos. Our results show that zHsf1 plays a positive role in HS-driven expression of zper2 in the dark but seems to act as an attenuator in the presence light. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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41. Transgenerational DNA Methylation Changes in Daphnia magna Exposed to Chronic γ Irradiation.
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Trijau, Marie, Asselman, Jana, Armant, Olivier, Adam-Guillermin, Christelle, De Schamphelaere, Karel A. C., and Alonzo, Frédéric
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- 2018
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42. Whole transcriptome data of zebrafish exposed to chronic dose of depleted uranium
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Armant, Olivier, Gombeau, Kewin, and Guillermin, Christelle Adam
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- 2017
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43. Development of Bag-1L as a therapeutic target in androgen receptor-dependent prostate cancer.
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Cato, Laura, Neeb, Antje, Sharp, Adam, Buzón, Victor, Ficarro, Scott B., Linxiao Yang, Muhle-Goll, Claudia, Kuznik, Nane C., Riisnaes, Ruth, Rodrigues, Daniel Nava, Armant, Olivier, Gourain, Victor, Adelmant, Guillaume, Ntim, Emmanuel A., Westerling, Thomas, Dolling, David, Rescigno, Pasquale, Figueiredo, Ines, Fauser, Friedrich, and Wu, Jennifer
- Published
- 2017
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44. Zebrafish exposure to environmentally relevant concentration of depleted uranium impairs progeny development at the molecular and histological levels.
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Armant, Olivier, Gombeau, Kewin, Murat El Houdigui, Sophia, Floriani, Magali, Camilleri, Virginie, Cavalie, Isabelle, and Adam-Guillermin, Christelle
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ZEBRA danio , *ENVIRONMENTAL exposure , *DEPLETED uranium , *HISTOLOGY , *ANTHROPOGENIC effects on nature - Abstract
Uranium is an actinide naturally found in the environment. Anthropogenic activities lead to the release of increasing amounts of uranium and depleted uranium (DU) in the environment, posing potential risks to aquatic organisms due to radiological and chemical toxicity of this radionucleide. Although environmental contaminations with high levels of uranium have already been observed, chronic exposures of non-human species to levels close to the environmental quality standards remain scarcely characterized. The present study focused on the identification of the molecular pathways impacted by a chronic exposure of zebrafish to 20 μg/L of DU during 10 days. The transcriptomic effects were evaluated by the use of the mRNAseq analysis in three organs of adult zebrafish, the brain the testis and the ovaries, and two developmental stages of the adult fish progeny, two-cells embryo and four-days larvae. The results highlight generic effects on the cell adhesion process, but also specific transcriptomic responses depending on the organ or the developmental stage investigated. The analysis of the transgenerational effects of DU-exposure on the four-day zebrafish larvae demonstrate an induction of genes involved in oxidative response (cat, mpx, sod1 and sod2), a decrease of expression of the two hatching enzymes (he1a and he1b), the deregulation of the expression of gene coding for the ATPase complex and the induction of cellular stress. Electron microscopy analysis of skeletal muscles on the four-days larvae highlights significant histological impacts on the ultrastructure of both the mitochondria and the myofibres. In addition, the comparison with the transcriptomic data obtained for the acetylcholine esterase mutant reveals the induction of protein-chaperons in the skeletal muscles of the progeny of fish chronically exposed to DU, pointing towards long lasting effects of this chemical in the muscles. The results presented in this study support the hypothesis that a chronic parental exposure to an environmentally relevant concentration of DU could impair the progeny development with significant effects observed both at the molecular level and on the histological ultrastructure of organs. This study provides a comprehensive transcriptomic dataset useful for ecotoxicological studies on other fish species at the molecular level. It also provides a key DU responsive gene, egr1, which may be a candidate biomarker for monitoring aquatic pollution by heavy metals. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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45. Sequential phases of cortical specification involve Neurogenin-dependent and -independent pathways
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Armant, Olivier, Britz, Olivier, Dyck, Richard, Stenman, Jan M., Seibt, Julie, Langevin, Lisa Marie, Nieto, Marta, Cunningham, James M., Schuurmans, Carol, Klenin, Natalia, Guillemot, François, Campbell, Kenny, Brown, Craig, Walsh, Christopher, Tang, Hua, and Polleux, Franck
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nervous system - Abstract
Neocortical projection neurons, which segregate into six cortical layers according to their birthdate, have diverse morphologies, axonal projections and molecular profiles, yet they share a common cortical regional identity and glutamatergic neurotransmission phenotype. Here we demonstrate that distinct genetic programs operate at different stages of corticogenesis to specify the properties shared by all neocortical neurons. Ngn1 and Ngn2 are required to specify the cortical (regional), glutamatergic (neurotransmitter) and laminar (temporal) characters of early-born (lower-layer) neurons, while simultaneously repressing an alternative subcortical, GABAergic neuronal phenotype. Subsequently, later-born (upper-layer) cortical neurons are specified in an Ngn-independent manner, requiring instead the synergistic activities of Pax6 and Tlx, which also control a binary choice between cortical/glutamatergic and subcortical/GABAergic fates. Our study thus reveals an unanticipated heterogeneity in the genetic mechanisms specifying the identity of neocortical projection neurons.
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- 2004
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46. Whole transcriptome data analysis of zebrafish mutants affecting muscle development
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Armant, Olivier, Gourain, Victor, Etard, Christelle, and Strähle, Uwe
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- 2016
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47. Lmx1b is required for the glutamatergic fates of a subset of spinal cord neurons.
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Hilinski, William C., Bostrom, Jonathan R., England, Samantha J., Juárez-Morales, José L., de Jager, Sarah, Armant, Olivier, Legradi, Jessica, Strähle, Uwe, Link, Brian A., and Lewis, Katharine E.
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TRANSCRIPTION factors ,SPINAL cord ,INTERNEURONS ,EXCITATORY amino acid agents ,NEUROTRANSMITTERS - Abstract
Background: Alterations in neurotransmitter phenotypes of specific neurons can cause imbalances in excitation and inhibition in the central nervous system (CNS), leading to diseases. Therefore, the correct specification and maintenance of neurotransmitter phenotypes is vital. As with other neuronal properties, neurotransmitter phenotypes are often specified and maintained by particular transcription factors. However, the specific molecular mechanisms and transcription factors that regulate neurotransmitter phenotypes remain largely unknown. Methods: In this paper we use single mutant, double mutant and transgenic zebrafish embryos to elucidate the functions of Lmx1ba and Lmx1bb in the regulation of spinal cord interneuron neurotransmitter phenotypes. Results: We demonstrate that lmx1ba and lmx1bb are both expressed in zebrafish spinal cord and that lmx1bb is expressed by both V0v cells and dI5 cells. Our functional analyses demonstrate that these transcription factors are not required for neurotransmitter fate specification at early stages of development, but that in embryos with at least two lmx1ba and/or lmx1bb mutant alleles there is a reduced number of excitatory (glutamatergic) spinal interneurons at later stages of development. In contrast, there is no change in the numbers of V0v or dI5 cells. These data suggest that lmx1b-expressing spinal neurons still form normally, but at least a subset of them lose, or do not form, their normal excitatory fates. As the reduction in glutamatergic cells is only seen at later stages of development, Lmx1b is probably required either for the maintenance of glutamatergic fates or to specify glutamatergic phenotypes of a subset of later forming neurons. Using double labeling experiments, we also show that at least some of the cells that lose their normal glutamatergic phenotype are V0v cells. Finally, we also establish that Evx1 and Evx2, two transcription factors that are required for V0v cells to acquire their excitatory neurotransmitter phenotype, are also required for lmx1ba and lmx1bb expression in these cells, suggesting that Lmx1ba and Lmx1bb act downstream of Evx1 and Evx2 in V0v cells. Conclusions: Lmx1ba and Lmx1bb function at least partially redundantly in the spinal cord and three functional lmx1b alleles are required in zebrafish for correct numbers of excitatory spinal interneurons at later developmental stages. Taken together, our data significantly enhance our understanding of how spinal cord neurotransmitter fates are regulated. [ABSTRACT FROM AUTHOR]
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- 2016
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48. Loss of function of myosin chaperones triggers Hsf1-mediated transcriptional response in skeletal muscle cells.
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Etard, Christelle, Armant, Olivier, Roostalu, Urmas, Gourain, Victor, Ferg, Marco, and Strähle, Uwe
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- 2015
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49. The Helix-Loop-Helix Protein Id1 Controls Stem Cell Proliferation During Regenerative Neurogenesis in the Adult Zebrafish Telencephalon.
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Viales, Rebecca Rodriguez, Diotel, Nicolas, Ferg, Marco, Armant, Olivier, Eich, Julia, März, Martin, Rastegar, Sepand, Strähle, Uwe, Alunni, Alessandro, and Bally-Cuif, Laure
- Subjects
HELIX-loop-helix motifs ,STEM cells ,GENETIC transcription ,DEVELOPMENTAL neurobiology ,TELENCEPHALON - Abstract
The teleost brain has the remarkable ability to generate new neurons and to repair injuries during adult life stages. Maintaining life-long neurogenesis requires careful management of neural stem cell pools. In a genome-wide expression screen for transcription regulators, the id1 gene, encoding a negative regulator of E-proteins, was found to be upregulated in response to injury. id1 expression was mapped to quiescent type I neural stem cells in the adult telencephalic stem cell niche. Gain and loss of id1 function in vivo demonstrated that Id1 promotes stem cell quiescence. The increased id1 expression observed in neural stem cells in response to injury appeared independent of inflammatory signals, suggesting multiple antagonistic pathways in the regulation of reactive neurogenesis. Together, we propose that Id1 acts to maintain the neural stem cell pool by counteracting neurogenesis-promoting signals. S tem C ells 2015;33:892-903 [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
50. Whole genome and transcriptome analyses of environmental antibiotic sensitive and multi-resistant P seudomonas aeruginosa isolates exposed to waste water and tap water.
- Author
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Schwartz, Thomas, Kirchen, Silke, Dötsch, Andreas, Armant, Olivier, Bretschneider, Nancy, Hahn, Alexander, and Seifert, Martin
- Subjects
PSEUDOMONAS aeruginosa ,SEWAGE microbiology ,DRINKING water analysis ,DRINKING water microbiology ,PHYSIOLOGICAL effects of antibiotics - Abstract
The fitness of sensitive and resistant P seudomonas aeruginosa in different aquatic environments depends on genetic capacities and transcriptional regulation. Therefore, an antibiotic-sensitive isolate PA30 and a multi-resistant isolate PA49 originating from waste waters were compared via whole genome and transcriptome Illumina sequencing after exposure to municipal waste water and tap water. A number of different genomic islands (e.g. PAGIs, PAPIs) were identified in the two environmental isolates beside the highly conserved core genome. Exposure to tap water and waste water exhibited similar transcriptional impacts on several gene clusters (antibiotic and metal resistance, genetic mobile elements, efflux pumps) in both environmental P . aeruginosa isolates. The MexCD- OprJ efflux pump was overexpressed in PA49 in response to waste water. The expression of resistance genes, genetic mobile elements in PA49 was independent from the water matrix. Consistently, the antibiotic sensitive strain PA30 did not show any difference in expression of the intrinsic resistance determinants and genetic mobile elements. Thus, the exposure of both isolates to polluted waste water and oligotrophic tap water resulted in similar expression profiles of mentioned genes. However, changes in environmental milieus resulted in rather unspecific transcriptional responses than selected and stimuli-specific gene regulation. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
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