1
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Perrin A, Khimoun A, Ollivier A, Richard Y, Pérez-Rodríguez A, Faivre B, Garnier S. Habitat fragmentation matters more than habitat loss: The case of host-parasite interactions. Mol Ecol 2023; 32:951-969. [PMID: 36461661 DOI: 10.1111/mec.16807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 11/29/2022] [Accepted: 12/01/2022] [Indexed: 12/05/2022]
Abstract
While ecologists agree that habitat loss has a substantial negative effect on biodiversity it is still very much a matter of debate whether habitat fragmentation has a lesser effect and whether this effect is positive or negative for biodiversity. Here, we assess the relative influence of tropical forest loss and fragmentation on the prevalence of vector-borne blood parasites of the genera Plasmodium and Haemoproteus in six forest bird species. We also determine whether habitat loss and fragmentation are associated with a rise or fall in prevalence. We sample more than 4000 individual birds from 58 forest sites in Guadeloupe and Martinique. Considering 34 host-parasite combinations independently and a fine characterization of the amount and spatial configuration of habitat, we use partial least square regressions to disentangle the relative effects of forest loss, forest fragmentation, landscape heterogeneity, and local weather conditions on spatial variability of parasite prevalence. Then we test for the magnitude and the sign of the effect of each environmental descriptor. Strikingly, we show that forest fragmentation explains twice as much of the variance in prevalence as habitat loss or landscape heterogeneity. In addition, habitat fragmentation leads to an overall rise in prevalence in Guadeloupe, but its effect is variable in Martinique. Both habitat loss and landscape heterogeneity exhibit taxon-specific effects. Our results suggest that habitat loss and fragmentation may have contrasting effects between tropical and temperate regions and that inter-specific interactions may not respond in the same way as more commonly used biodiversity metrics such as abundance and diversity.
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Affiliation(s)
- Antoine Perrin
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, Dijon, France.,Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland
| | - Aurélie Khimoun
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, Dijon, France
| | - Anthony Ollivier
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, Dijon, France
| | - Yves Richard
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, Dijon, France
| | | | - Bruno Faivre
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, Dijon, France
| | - Stéphane Garnier
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, Dijon, France
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2
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Daniel A, Savary P, Foltête JC, Khimoun A, Faivre B, Ollivier A, Éraud C, Moal H, Vuidel G, Garnier S. Validating graph-based connectivity models with independent presence-absence and genetic data sets. Conserv Biol 2023; 37:e14047. [PMID: 36661070 DOI: 10.1111/cobi.14047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 11/11/2022] [Accepted: 11/22/2022] [Indexed: 05/11/2023]
Abstract
Habitat connectivity is a key objective of current conservation policies and is commonly modeled by landscape graphs (i.e., sets of habitat patches [nodes] connected by potential dispersal paths [links]). These graphs are often built based on expert opinion or species distribution models (SDMs) and therefore lack empirical validation from data more closely reflecting functional connectivity. Accordingly, we tested whether landscape graphs reflect how habitat connectivity influences gene flow, which is one of the main ecoevolutionary processes. To that purpose, we modeled the habitat network of a forest bird (plumbeous warbler [Setophaga plumbea]) on Guadeloupe with graphs based on expert opinion, Jacobs' specialization indices, and an SDM. We used genetic data (712 birds from 27 populations) to compute local genetic indices and pairwise genetic distances. Finally, we assessed the relationships between genetic distances or indices and cost distances or connectivity metrics with maximum-likelihood population-effects distance models and Spearman correlations between metrics. Overall, the landscape graphs reliably reflected the influence of connectivity on population genetic structure; validation R2 was up to 0.30 and correlation coefficients were up to 0.71. Yet, the relationship among graph ecological relevance, data requirements, and construction and analysis methods was not straightforward because the graph based on the most complex construction method (species distribution modeling) sometimes had less ecological relevance than the others. Cross-validation methods and sensitivity analyzes allowed us to make the advantages and limitations of each construction method spatially explicit. We confirmed the relevance of landscape graphs for conservation modeling but recommend a case-specific consideration of the cost-effectiveness of their construction methods. We hope the replication of independent validation approaches across species and landscapes will strengthen the ecological relevance of connectivity models.
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Affiliation(s)
- Alexandrine Daniel
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne-Franche-Comté, Dijon, France
| | - Paul Savary
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne-Franche-Comté, Dijon, France
- ThéMA, UMR 6049 CNRS, Université de Franche-Comté, Besançon, France
- ARP-Astrance, Paris, France
| | | | - Aurélie Khimoun
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne-Franche-Comté, Dijon, France
| | - Bruno Faivre
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne-Franche-Comté, Dijon, France
| | - Anthony Ollivier
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne-Franche-Comté, Dijon, France
| | - Cyril Éraud
- Office Français de la Biodiversité, Chizé, France
| | | | - Gilles Vuidel
- ThéMA, UMR 6049 CNRS, Université de Franche-Comté, Besançon, France
| | - Stéphane Garnier
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne-Franche-Comté, Dijon, France
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3
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Perrin A, Khimoun A, Faivre B, Ollivier A, de Pracontal N, Théron F, Loubon M, Leblond G, Duron O, Garnier S. Habitat fragmentation differentially shapes neutral and immune gene variation in a tropical bird species. Heredity (Edinb) 2021; 126:148-162. [PMID: 32934360 PMCID: PMC7853120 DOI: 10.1038/s41437-020-00366-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 08/30/2020] [Accepted: 08/30/2020] [Indexed: 01/11/2023] Open
Abstract
Habitat fragmentation is a major cause of biodiversity loss, responsible for an alteration of intraspecific patterns of neutral genetic diversity and structure. Although neutral genetic variation can be informative for demographic inferences, it may be a poor predictor of adaptive genetic diversity and thus of the consequences of habitat fragmentation on selective evolutionary processes. In this context, we contrasted patterns of genetic diversity and structure of neutral loci (microsatellites) and immune genes (i.e., toll-like receptors) in an understorey bird species, the wedge-billed woodcreeper Glyphorynchus spirurus. The objectives were (1) to investigate forest fragmentation effects on population genetic diversity, (2) to disentangle the relative role of demography (genetic drift and migration) and selection, and (3) to assess whether immunogenetic patterns could be associated with variation of ectoparasite (i.e., ticks) pressures. Our results revealed an erosion of neutral genetic diversity and a substantial genetic differentiation among fragmented populations, resulting from a decrease in landscape connectivity and leading to the divergence of distinct genetic pools at a small spatial scale. Patterns of genetic diversity observed for TLR4 and TLR5 were concordant with neutral genetic patterns, whereas those observed for TLR3 and TLR21 were discordant. This result underlines that the dominant evolutionary force shaping immunogenetic diversity (genetic drift vs. selection) may be different depending on loci considered. Finally, tick prevalence was higher in fragmented environments. We discussed the hypothesis that pathogen selective pressures may contribute to maintain adaptive genetic diversity despite the negative demographic effect of habitat fragmentation on neutral genetic diversity.
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Affiliation(s)
- Antoine Perrin
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000, Dijon, France.
| | - Aurélie Khimoun
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000, Dijon, France
| | - Bruno Faivre
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000, Dijon, France
| | - Anthony Ollivier
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000, Dijon, France
| | - Nyls de Pracontal
- Groupe d'Etude et de Protection des Oiseaux en Guyane, 431 route d'Attila Cabassou, 97354, Rémire-Montjoly, France
| | - Franck Théron
- Groupe d'Etude et de Protection des Oiseaux en Guyane, 431 route d'Attila Cabassou, 97354, Rémire-Montjoly, France
| | - Maxime Loubon
- Groupe d'Etude et de Protection des Oiseaux en Guyane, 431 route d'Attila Cabassou, 97354, Rémire-Montjoly, France
| | - Gilles Leblond
- SARL BIOS, Route de Davidon, Duzer, 97115, Sainte-Rose, France
| | - Olivier Duron
- Maladies Infectieuses et Vecteurs: Ecologie, Génétique, Evolution et Contrôle (MIVEGEC), Centre National de la Recherche Scientifique (CNRS), Institut pour la Recherche et le Développement (IRD), Université de Montpellier (UM), Montpellier, France
| | - Stéphane Garnier
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000, Dijon, France
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4
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Wattier R, Mamos T, Copilaş-Ciocianu D, Jelić M, Ollivier A, Chaumot A, Danger M, Felten V, Piscart C, Žganec K, Rewicz T, Wysocka A, Rigaud T, Grabowski M. Continental-scale patterns of hyper-cryptic diversity within the freshwater model taxon Gammarus fossarum (Crustacea, Amphipoda). Sci Rep 2020; 10:16536. [PMID: 33024224 PMCID: PMC7538970 DOI: 10.1038/s41598-020-73739-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 09/16/2020] [Indexed: 12/11/2022] Open
Abstract
Traditional morphological diagnoses of taxonomic status remain widely used while an increasing number of studies show that one morphospecies might hide cryptic diversity, i.e. lineages with unexpectedly high molecular divergence. This hidden diversity can reach even tens of lineages, i.e. hyper cryptic diversity. Even well-studied model-organisms may exhibit overlooked cryptic diversity. Such is the case of the freshwater crustacean amphipod model taxon Gammarus fossarum. It is extensively used in both applied and basic types of research, including biodiversity assessments, ecotoxicology and evolutionary ecology. Based on COI barcodes of 4926 individuals from 498 sampling sites in 19 European countries, the present paper shows (1) hyper cryptic diversity, ranging from 84 to 152 Molecular Operational Taxonomic Units, (2) ancient diversification starting already 26 Mya in the Oligocene, and (3) high level of lineage syntopy. Even if hyper cryptic diversity was already documented in G. fossarum, the present study increases its extent fourfold, providing a first continental-scale insight into its geographical distribution and establishes several diversification hotspots, notably south-eastern and central Europe. The challenges of recording hyper cryptic diversity in the future are also discussed.
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Affiliation(s)
- Remi Wattier
- UMR CNRS 6282 Biogéosciences, Université Bourgogne Franche Comté, Dijon, France.
| | - Tomasz Mamos
- Department of Invertebrate Zoology and Hydrobiology, University of Lodz, Lodz, Poland.,Zoological Institute, University of Basel, Basel, Switzerland
| | - Denis Copilaş-Ciocianu
- Institute of Ecology, Nature Research Centre, Vilnius Nature Research Centre, Institute of Ecology, Vilnius, Lithuania
| | - Mišel Jelić
- Department of Natural Sciences, Varaždin City Museum, Varaždin, Croatia
| | - Anthony Ollivier
- UMR CNRS 6282 Biogéosciences, Université Bourgogne Franche Comté, Dijon, France
| | - Arnaud Chaumot
- Laboratoire d'écotoxicologie, INRAE, UR RiverLy, Villeurbanne, France
| | - Michael Danger
- UMR CNRS 73602 LIEC, Université de Lorraine, Metz, France
| | - Vincent Felten
- UMR CNRS 73602 LIEC, Université de Lorraine, Metz, France
| | | | - Krešimir Žganec
- Department of Teacher Education Studies in Gospić, University of Zadar, Gospić, Croatia
| | - Tomasz Rewicz
- Department of Invertebrate Zoology and Hydrobiology, University of Lodz, Lodz, Poland.,University of Guelph, Centre for Biodiversity Genomics, Guelph, ON, Canada
| | - Anna Wysocka
- Department of Genetics and Biosystematics, University of Gdansk, Gdansk, Poland
| | - Thierry Rigaud
- UMR CNRS 6282 Biogéosciences, Université Bourgogne Franche Comté, Dijon, France
| | - Michał Grabowski
- Department of Invertebrate Zoology and Hydrobiology, University of Lodz, Lodz, Poland.
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5
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Sengmany S, Martens T, Ollivier A, Rey M, Léonel E. Direct Phosphonylation of N-Carbamate-tetrahydroisoquinoline by Convergent Paired Electrolysis. Synlett 2020. [DOI: 10.1055/s-0039-1690899] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Mild experimental conditions for a direct phosphonylation of an easily cleavable N-carbamate-tetrahydroisoquinoline have been described under constant current electrolysis. The developed electrochemical process allowed to prepare α-aminophosphonates in moderate to good yields. On the basis of the experimental results, a mechanism proceeding through a convergent paired electrochemical process was enabled to be postulated.
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6
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Ollivier A, Foresti R, El Ali Z, Martens T, Kitagishi H, Motterlini R, Rivard M. Design and Biological Evaluation of Manganese- and Ruthenium-Based Hybrid CO-RMs (HYCOs). ChemMedChem 2019; 14:1684-1691. [PMID: 31319021 DOI: 10.1002/cmdc.201900426] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Indexed: 01/07/2023]
Abstract
Interest in the therapeutic effects of carbon monoxide (CO), a product of heme degradation catalyzed by the enzyme heme oxygenase-1 (HO-1), has led to the development of CO-releasing molecules (CO-RMs) for the controlled delivery of this gas in vivo. We recently proposed conjugating a cobalt-based CO-RM with various activators of nuclear factor erythroid 2-related factor 2 (Nrf2), the transcription factor that regulates HO-1 expression, in order to exploit the beneficial effects of exogenous and endogenous CO. In this study, we describe the preparation of hybrid molecules (termed HYCOs) conjugating a fumaric acid derivative as an Nrf2 activator to a Mn- or a Ru-based CO-RM known to be pharmacologically active. With the exception of an acyl-manganese complex, these hybrids were obtained by associating the two bioactive entities by means of a linker of variable structure. X-ray diffraction analyses and preliminary biological investigations are also presented.
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Affiliation(s)
- Anthony Ollivier
- Université Paris Est, ICMPE (UMR 7182), CNRS, UPEC, 94320, Thiais, France
| | - Roberta Foresti
- INSERM U955, Equipe 12, 94000, Créteil, France.,Université Paris Est, Faculté de Médecine, 94000, Créteil, France
| | - Zeina El Ali
- INSERM U955, Equipe 12, 94000, Créteil, France.,Université Paris Est, Faculté de Médecine, 94000, Créteil, France
| | - Thierry Martens
- Université Paris Est, ICMPE (UMR 7182), CNRS, UPEC, 94320, Thiais, France
| | - Hiroaki Kitagishi
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto, 610-0321, Japan
| | - Roberto Motterlini
- INSERM U955, Equipe 12, 94000, Créteil, France.,Université Paris Est, Faculté de Médecine, 94000, Créteil, France
| | - Michael Rivard
- Université Paris Est, ICMPE (UMR 7182), CNRS, UPEC, 94320, Thiais, France
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7
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Motterlini R, Nikam A, Manin S, Ollivier A, Wilson JL, Djouadi S, Muchova L, Martens T, Rivard M, Foresti R. HYCO-3, a dual CO-releaser/Nrf2 activator, reduces tissue inflammation in mice challenged with lipopolysaccharide. Redox Biol 2018; 20:334-348. [PMID: 30391826 PMCID: PMC6223233 DOI: 10.1016/j.redox.2018.10.020] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 10/12/2018] [Accepted: 10/23/2018] [Indexed: 12/16/2022] Open
Abstract
Oxidative stress and inflammation are predominant features of several chronic diseases. The nuclear factor erythroid 2-related factor 2 (Nrf2) is a major arbiter in counteracting these insults via up-regulation of several defensive proteins, including heme oxygenase-1 (HO-1). HO-1-derived carbon monoxide (CO) exhibits anti-inflammatory actions and can be delivered to tissues by CO-releasing agents. In this study we assessed the pharmacological and anti-inflammatory properties of HYCO-3, a dual activity compound obtained by conjugating analogues of the CO-releasing molecule CORM-401 and dimethyl fumarate (DMF), an immunomodulatory drug known to activate Nrf2. HYCO-3 induced Nrf2-dependent genes and delivered CO to cells in vitro and tissues in vivo, confirming that the two expected pharmacological properties of this agent are achieved. In mice challenged with lipopolysaccharide, orally administered HYCO-3 reduced the mRNA levels of pro-inflammatory markers (TNF-α, IL-1β and IL-6) while increasing the expression of the anti-inflammatory genes ARG1 and IL-10 in brain, liver, lung and heart. In contrast, DMF or CORM-401 alone or their combination decreased the expression of pro-inflammatory genes but had limited influence on anti-inflammatory markers. Furthermore, HYCO-3 diminished TNF-α and IL-1β in brain and liver but not in lung and heart of Nrf2-/- mice, indicating that the CO-releasing part of this hybrid contributes to reduction of pro-inflammation and that this effect is organ-specific. These data demonstrate that the dual activity of HYCO-3 results in enhanced efficacy compared to the parent compounds indicating the potential exploitation of hybrid compounds in the development of effective anti-inflammatory therapies. HYCO-3 is a novel hybrid between an Nrf2 activator and a CO-releasing molecule. HYCO-3 induces Nrf2 and simultaneously delivers CO in vitro and in vivo. Oral administration of HYCO-3 reduces inflammation in mice challenged with LPS. In Nrf2-/- mice, the anti-inflammatory action of HYCO-3 is organ specific.
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Affiliation(s)
- Roberto Motterlini
- Inserm U955, Equipe 12, Créteil 94000, France; University Paris-Est, Faculty of Medicine, Créteil 94000, France.
| | - Aniket Nikam
- Inserm U955, Equipe 12, Créteil 94000, France; University Paris-Est, Faculty of Medicine, Créteil 94000, France
| | - Sylvie Manin
- Inserm U955, Equipe 12, Créteil 94000, France; University Paris-Est, Faculty of Medicine, Créteil 94000, France
| | - Anthony Ollivier
- University Paris Est, ICMPE (UMR 7182), CNRS, F-94320 Thiais, France
| | - Jayne Louise Wilson
- Inserm U955, Equipe 12, Créteil 94000, France; University Paris-Est, Faculty of Medicine, Créteil 94000, France
| | - Sabrina Djouadi
- Inserm U955, Equipe 12, Créteil 94000, France; University Paris-Est, Faculty of Medicine, Créteil 94000, France
| | - Lucie Muchova
- Institute of Medical Biochemistry and Laboratory Diagnostics, 1st Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Thierry Martens
- University Paris Est, ICMPE (UMR 7182), CNRS, F-94320 Thiais, France
| | - Michael Rivard
- University Paris Est, ICMPE (UMR 7182), CNRS, F-94320 Thiais, France
| | - Roberta Foresti
- Inserm U955, Equipe 12, Créteil 94000, France; University Paris-Est, Faculty of Medicine, Créteil 94000, France.
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8
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Abstract
The first example of a nickel-catalyzed electrochemical coupling between dimethyl phosphite and (hetero)aryl halides to furnish (hetero)arylphosphonates is described.
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Affiliation(s)
- Stéphane Sengmany
- Électrochimie et Synthèse Organique
- Université Paris Est
- ICMPE (UMR 7182)
- CNRS
- UPEC
| | - Anthony Ollivier
- Électrochimie et Synthèse Organique
- Université Paris Est
- ICMPE (UMR 7182)
- CNRS
- UPEC
| | - Erwan Le Gall
- Électrochimie et Synthèse Organique
- Université Paris Est
- ICMPE (UMR 7182)
- CNRS
- UPEC
| | - Eric Léonel
- Électrochimie et Synthèse Organique
- Université Paris Est
- ICMPE (UMR 7182)
- CNRS
- UPEC
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9
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Lippens C, Guivier E, Ollivier A, Faivre B, Sorci G. Life history adjustments to intestinal inflammation in a gut nematode. J Exp Biol 2017; 220:3724-3732. [DOI: 10.1242/jeb.161059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 08/10/2017] [Indexed: 11/20/2022]
Abstract
ABSTRACT
Many parasitic nematodes establish chronic infections. This implies a finely tuned interaction with the host immune response in order to avoid infection clearance. Although a number of immune interference mechanisms have been described in nematodes, how parasites adapt to the immune environment provided by their hosts remains largely unexplored. Here, we used the gastrointestinal nematode Heligmosomoides polygyrus to investigate the plasticity of life history traits and immunomodulatory mechanisms in response to intestinal inflammation. We adopted an experimental model of induced colitis and exposed worms to intestinal inflammation at two different developmental stages (larvae and adults). We found that H. polygyrus responded to intestinal inflammation by up-regulating the expression of a candidate gene involved in the interference with the host immune response. Worms infecting mice with colitis also had better infectivity (earlier adult emergence in the intestinal lumen and higher survival) compared with worms infecting control hosts, suggesting that H. polygyrus adjusted its life history schedule in response to intestinal inflammation.
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Affiliation(s)
- Cédric Lippens
- Biogéosciences, CNRS UMR 6282, Université de Bourgogne Franche-Comté, 6 boulevard Gabriel, 21000 Dijon, France
| | - Emmanuel Guivier
- Biogéosciences, CNRS UMR 6282, Université de Bourgogne Franche-Comté, 6 boulevard Gabriel, 21000 Dijon, France
- Institut Méditerranéen de la Biodiversité et d'Ecologie marine et continentale (IMBE, UMR Université Aix Marseille/CNRS 7263/IRD 237/Avignon Université), France
| | - Anthony Ollivier
- Biogéosciences, CNRS UMR 6282, Université de Bourgogne Franche-Comté, 6 boulevard Gabriel, 21000 Dijon, France
| | - Bruno Faivre
- Biogéosciences, CNRS UMR 6282, Université de Bourgogne Franche-Comté, 6 boulevard Gabriel, 21000 Dijon, France
| | - Gabriele Sorci
- Biogéosciences, CNRS UMR 6282, Université de Bourgogne Franche-Comté, 6 boulevard Gabriel, 21000 Dijon, France
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10
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Khimoun A, Ollivier A, Faivre B, Garnier S. Level of genetic differentiation affects relative performances of expressed sequence tag and genomic SSRs. Mol Ecol Resour 2017; 17:893-903. [PMID: 27978606 DOI: 10.1111/1755-0998.12642] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 10/26/2016] [Accepted: 12/06/2016] [Indexed: 12/12/2022]
Abstract
Microsatellites, also called simple sequence repeats (SSRs), are markers of choice to estimate relevant parameters for conservation genetics, such as migration rates, effective population size and kinship. Cross-amplification of SSRs is the simplest way to obtain sets of markers, and highly conserved SSRs have recently been developed from expressed sequence tags (EST) to improve SSR cross-species utility. As EST-SSRs are located in coding regions, the higher stability of their flanking regions reduces the frequency of null alleles and improves cross-species amplification. However, EST-SSRs have generally less allelic variability than genomic SSRs, potentially leading to differences in estimates of population genetic parameters such as genetic differentiation. To assess the potential of EST-SSRs in studies of within-species genetic diversity, we compared the relative performance of EST- and genomic SSRs following a multispecies approach on passerine birds. We tested whether patterns and levels of genetic diversity within and between populations assessed from EST- and from genomic SSRs are congruent, and we investigated how the relative efficiency of EST- and genomic SSRs is influenced by levels of differentiation. EST- and genomic SSRs ensured comparable inferences of population genetic structure in cases of strong genetic differentiation, and genomic SSRs performed slightly better than EST-SSRs when differentiation is moderate. However and interestingly, EST-SSRs had a higher power to detect weak genetic structure compared to genomic SSRs. Our study attests that EST-SSRs may be valuable molecular markers for conservation genetic studies in taxa such as birds, where the development of genomic SSRs is impeded by their low frequency.
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Affiliation(s)
- Aurélie Khimoun
- Biogéosciences UMR6282, CNRS, Univ. Bourgogne Franche-Comté, Equipe BIOME, 6 bd Gabriel, 21000, Dijon, France
| | - Anthony Ollivier
- Biogéosciences UMR6282, CNRS, Univ. Bourgogne Franche-Comté, Equipe BIOME, 6 bd Gabriel, 21000, Dijon, France
| | - Bruno Faivre
- Biogéosciences UMR6282, CNRS, Univ. Bourgogne Franche-Comté, Equipe BIOME, 6 bd Gabriel, 21000, Dijon, France
| | - Stéphane Garnier
- Biogéosciences UMR6282, CNRS, Univ. Bourgogne Franche-Comté, Equipe BIOME, 6 bd Gabriel, 21000, Dijon, France
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11
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Khimoun A, Eraud C, Ollivier A, Arnoux E, Rocheteau V, Bely M, Lefol E, Delpuech M, Carpentier ML, Leblond G, Levesque A, Charbonnel A, Faivre B, Garnier S. Habitat specialization predicts genetic response to fragmentation in tropical birds. Mol Ecol 2016; 25:3831-44. [PMID: 27314987 DOI: 10.1111/mec.13733] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Revised: 06/06/2016] [Accepted: 06/07/2016] [Indexed: 01/19/2023]
Abstract
Habitat fragmentation is one of the most severe threats to biodiversity as it may lead to changes in population genetic structure, with ultimate modifications of species evolutionary potential and local extinctions. Nonetheless, fragmentation does not equally affect all species and identifying which ecological traits are related to species sensitivity to habitat fragmentation could help prioritization of conservation efforts. Despite the theoretical link between species ecology and extinction proneness, comparative studies explicitly testing the hypothesis that particular ecological traits underlies species-specific population structure are rare. Here, we used a comparative approach on eight bird species, co-occurring across the same fragmented landscape. For each species, we quantified relative levels of forest specialization and genetic differentiation among populations. To test the link between forest specialization and susceptibility to forest fragmentation, we assessed species responses to fragmentation by comparing levels of genetic differentiation between continuous and fragmented forest landscapes. Our results revealed a significant and substantial population structure at a very small spatial scale for mobile organisms such as birds. More importantly, we found that specialist species are more affected by forest fragmentation than generalist ones. Finally, our results suggest that even a simple habitat specialization index can be a satisfying predictor of genetic and demographic consequences of habitat fragmentation, providing a reliable practical and quantitative tool for conservation biology.
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Affiliation(s)
- Aurélie Khimoun
- UMR 6282 Biogéosciences, CNRS/Univ. Bourgogne Franche-Comté, Equipe BIOME, 6 bd Gabriel, 21000, Dijon, France
| | - Cyril Eraud
- Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Station biologique de Chizé, Carrefour de la Canauderie, 79360, Villiers en Bois, France
| | - Anthony Ollivier
- UMR 6282 Biogéosciences, CNRS/Univ. Bourgogne Franche-Comté, Equipe BIOME, 6 bd Gabriel, 21000, Dijon, France
| | - Emilie Arnoux
- UMR 6282 Biogéosciences, CNRS/Univ. Bourgogne Franche-Comté, Equipe BIOME, 6 bd Gabriel, 21000, Dijon, France
| | - Vincent Rocheteau
- UMR 6282 Biogéosciences, CNRS/Univ. Bourgogne Franche-Comté, Equipe BIOME, 6 bd Gabriel, 21000, Dijon, France
| | - Marine Bely
- Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Station biologique de Chizé, Carrefour de la Canauderie, 79360, Villiers en Bois, France
| | - Emilie Lefol
- Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Station biologique de Chizé, Carrefour de la Canauderie, 79360, Villiers en Bois, France
| | - Martin Delpuech
- Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Station biologique de Chizé, Carrefour de la Canauderie, 79360, Villiers en Bois, France
| | - Marie-Laure Carpentier
- Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Station biologique de Chizé, Carrefour de la Canauderie, 79360, Villiers en Bois, France
| | - Gilles Leblond
- SARL BIOS, 168 rue de Brindeau, 97190, Le Gosier, France
| | - Anthony Levesque
- Office National de la Chasse et de la Faune Sauvage, Cellule Technique des Antilles Françaises, Chemin de Boyer, Section Boisbert, 97129, Le Lamentin, France
| | - Anaïs Charbonnel
- Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Station biologique de Chizé, Carrefour de la Canauderie, 79360, Villiers en Bois, France
| | - Bruno Faivre
- UMR 6282 Biogéosciences, CNRS/Univ. Bourgogne Franche-Comté, Equipe BIOME, 6 bd Gabriel, 21000, Dijon, France
| | - Stéphane Garnier
- UMR 6282 Biogéosciences, CNRS/Univ. Bourgogne Franche-Comté, Equipe BIOME, 6 bd Gabriel, 21000, Dijon, France
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Kagy V, Wong M, Vandenbroucke H, Jenny C, Dubois C, Ollivier A, Cardi C, Mournet P, Tuia V, Roux N, Doležel J, Perrier X. Traditional Banana Diversity in Oceania: An Endangered Heritage. PLoS One 2016; 11:e0151208. [PMID: 26982801 PMCID: PMC4794170 DOI: 10.1371/journal.pone.0151208] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 02/23/2016] [Indexed: 11/22/2022] Open
Abstract
This study aims to understand the genetic diversity of traditional Oceanian starchy bananas in order to propose an efficient conservation strategy for these endangered varieties. SSR and DArT molecular markers are used to characterize a large sample of Pacific accessions, from New Guinea to Tahiti and Hawaii. All Pacific starchy bananas are shown of New Guinea origin, by interspecific hybridization between Musa acuminata (AA genome), more precisely its local subspecies M. acuminata ssp. banksii, and M. balbisiana (BB genome) generating triploid AAB Pacific starchy bananas. These AAB genotypes do not form a subgroup sensu stricto and genetic markers differentiate two subgroups across the three morphotypes usually identified: Iholena versus Popoulu and Maoli. The Popoulu/Maoli accessions, even if morphologically diverse throughout the Pacific, cluster in the same genetic subgroup. However, the subgroup is not strictly monophyletic and several close, but different genotypes are linked to the dominant genotype. One of the related genotypes is specific to New Caledonia (NC), with morphotypes close to Maoli, but with some primitive characters. It is concluded that the diffusion of Pacific starchy AAB bananas results from a series of introductions of triploids originating in New Guinea area from several sexual recombination events implying different genotypes of M. acuminata ssp. banksii. This scheme of multiple waves from the New Guinea zone is consistent with the archaeological data for peopling of the Pacific. The present geographic distribution suggests that a greater diversity must have existed in the past. Its erosion finds parallels with the erosion of cultural traditions, inexorably declining in most of the Polynesian or Melanesian Islands. Symmetrically, diversity hot spots appear linked to the local persistence of traditions: Maoli in New Caledonian Kanak traditions or Iholena in a few Polynesian islands. These results will contribute to optimizing the conservation strategy for the ex-situ Pacific Banana Collection supported collectively by the Pacific countries.
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Affiliation(s)
- Valérie Kagy
- Institut Agronomique néo Calédonien (IAC), Connaissance et Amélioration des Agro-Systèmes, BP 32 98880 La Foa, Nouvelle Calédonie
- * E-mail:
| | - Maurice Wong
- Service du Développement Rural (SDR), Département de la Recherche Agronomique, BP 100, 98713 Papeete—Tahiti, Polynésie française
| | - Henri Vandenbroucke
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Unité Mixte de Recherche Amélioration Génétique et Adaptation des Plantes (AGAP), Avenue Agropolis, F-34398 Montpellier Cedex 5, France
| | - Christophe Jenny
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Unité Mixte de Recherche Amélioration Génétique et Adaptation des Plantes (AGAP), Avenue Agropolis, F-34398 Montpellier Cedex 5, France
| | - Cécile Dubois
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Unité Mixte de Recherche Amélioration Génétique et Adaptation des Plantes (AGAP), Avenue Agropolis, F-34398 Montpellier Cedex 5, France
| | - Anthony Ollivier
- Institut Agronomique néo Calédonien (IAC), Connaissance et Amélioration des Agro-Systèmes, BP 32 98880 La Foa, Nouvelle Calédonie
| | - Céline Cardi
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Unité Mixte de Recherche Amélioration Génétique et Adaptation des Plantes (AGAP), Avenue Agropolis, F-34398 Montpellier Cedex 5, France
| | - Pierre Mournet
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Unité Mixte de Recherche Amélioration Génétique et Adaptation des Plantes (AGAP), Avenue Agropolis, F-34398 Montpellier Cedex 5, France
| | - Valérie Tuia
- Pacific Community, Land Resources Division, Centre for Pacific Crops and Trees (CePaCT), Private Mail Bag, Suva, Fiji Islands
| | - Nicolas Roux
- Bioversity International, Parc Scientifique Agropolis II, F-34397 Montpellier Cedex 5, France
| | - Jaroslav Doležel
- Institute of Experimental Botany, Centre of the Region Haná for Biotechnological and Agricultural Research, Šlechtitelů 31, CZ-78371 Olomouc, Czech Republic
| | - Xavier Perrier
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Unité Mixte de Recherche Amélioration Génétique et Adaptation des Plantes (AGAP), Avenue Agropolis, F-34398 Montpellier Cedex 5, France
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13
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Nikam A, Ollivier A, Rivard M, Wilson JL, Mebarki K, Martens T, Dubois-Randé JL, Motterlini R, Foresti R. Diverse Nrf2 Activators Coordinated to Cobalt Carbonyls Induce Heme Oxygenase-1 and Release Carbon Monoxide in Vitro and in Vivo. J Med Chem 2016; 59:756-62. [DOI: 10.1021/acs.jmedchem.5b01509] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Aniket Nikam
- Equipe
12, Inserm U955, 8 Rue du Général Sarrail, Créteil, 94000, France
- Faculty
of Medicine, University Paris Est Créteil, Créteil, 94000, France
| | - Anthony Ollivier
- ICMPE
(UMR 7182), CNRS, UPEC, University Paris Est, F-94320 Thiais, France
| | - Michael Rivard
- ICMPE
(UMR 7182), CNRS, UPEC, University Paris Est, F-94320 Thiais, France
| | - Jayne Louise Wilson
- Equipe
12, Inserm U955, 8 Rue du Général Sarrail, Créteil, 94000, France
- Faculty
of Medicine, University Paris Est Créteil, Créteil, 94000, France
| | - Kevin Mebarki
- ICMPE
(UMR 7182), CNRS, UPEC, University Paris Est, F-94320 Thiais, France
| | - Thierry Martens
- ICMPE
(UMR 7182), CNRS, UPEC, University Paris Est, F-94320 Thiais, France
| | | | - Roberto Motterlini
- Equipe
12, Inserm U955, 8 Rue du Général Sarrail, Créteil, 94000, France
- Faculty
of Medicine, University Paris Est Créteil, Créteil, 94000, France
| | - Roberta Foresti
- Equipe
12, Inserm U955, 8 Rue du Général Sarrail, Créteil, 94000, France
- Faculty
of Medicine, University Paris Est Créteil, Créteil, 94000, France
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Ollivier A, Lardy H, Gibertini I. P-335 – Vécu parental des malformations kystiques pulmonaires: de l'annonce prénatale à la chirurgie. Arch Pediatr 2015. [DOI: 10.1016/s0929-693x(15)30515-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Wilson JL, Fayad Kobeissi S, Oudir S, Haas B, Michel B, Dubois Randé JL, Ollivier A, Martens T, Rivard M, Motterlini R, Foresti R. Design and synthesis of new hybrid molecules that activate the transcription factor Nrf2 and simultaneously release carbon monoxide. Chemistry 2014; 20:14698-704. [PMID: 25224540 DOI: 10.1002/chem.201403901] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Indexed: 12/15/2022]
Abstract
The transcription factor Nrf2 and its downstream target heme oxygenase-1 (HO-1) are essential protective systems against oxidative stress and inflammation. The products of HO-1 enzymatic activity, biliverdin and carbon monoxide (CO), actively contribute to this protection, suggesting that exploitation of these cellular systems may offer new therapeutic avenues in a variety of diseases. Starting from a CO-releasing compound and a chemical scaffold exhibiting electrophilic characteristics (esters of fumaric acid), we report the synthesis of hybrid molecules that simultaneously activate Nrf2 and liberate CO. These hybrid compounds, which we termed "HYCOs", release CO to myoglobin and activate the CO-sensitive fluorescent probe COP-1, while also potently inducing nuclear accumulation of Nrf2 and HO-1 expression and activity in different cell types. Thus, we provide here the first example of a new class of pharmacologically active molecules that target the HO-1 pathway by combining an Nrf2 activator coordinated to a CO-releasing group.
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Affiliation(s)
- Jayne Louise Wilson
- Inserm, Unité 955, Equipe 3 and Faculté de Médicine, Université Paris-Est Créteil, 8 Rue du General Sarrail, 94000 Créteil (France)
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16
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Ollivier A, Grougnet R, Cachet X, Meriane D, Ardisson J, Boutefnouchet S, Deguin B. Large scale purification of the SERCA inhibitor Thapsigargin from Thapsia garganica L. roots using centrifugal partition chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 926:16-20. [DOI: 10.1016/j.jchromb.2013.02.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Revised: 01/31/2013] [Accepted: 02/04/2013] [Indexed: 10/27/2022]
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17
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Masurier N, Debiton E, Jacquemet A, Bussière A, Chezal JM, Ollivier A, Tétégan D, Andaloussi M, Galmier MJ, Lacroix J, Canitrot D, Teulade JC, Gaudreault RC, Chavignon O, Moreau E. Imidazonaphthyridine systems (part 2): Functionalization of the phenyl ring linked to the pyridine pharmacophore and its replacement by a pyridinone ring produces intriguing differences in cytocidal activity. Eur J Med Chem 2012; 52:137-50. [DOI: 10.1016/j.ejmech.2012.03.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Revised: 03/02/2012] [Accepted: 03/06/2012] [Indexed: 11/27/2022]
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18
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Ollivier A, Sinibaldi ME, Toupet L, Traïkia M, Canet I. An entry to 1,6-dioxaspiro[4.6]undecanes and 1,7-dioxaspiro[5.6]dodecanes. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.06.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Canet I, Sinibaldi ME, Ollivier A, Goubert M, Tursun A. Orthogonally protected glycerols and 2-aminodiols, useful building blocks in heterocyclic chemistry. ARKIVOC 2010. [DOI: 10.3998/ark.5550190.0011.910] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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20
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Yekhlef F, Decup D, Niclot P, Servan J, Descombes S, Richecoeur J, Ollivier A. [Medico-economic assessment of the Pontoise Hospital stroke unit]. Rev Neurol (Paris) 2010; 166:901-8. [PMID: 20478608 DOI: 10.1016/j.neurol.2010.03.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2009] [Revised: 01/16/2010] [Accepted: 03/04/2010] [Indexed: 11/27/2022]
Abstract
INTRODUCTION Annually, approximately 120,000 people in France have a stroke. Various controlled studies have pointed out the benefits of treatment in a stroke unit (SU). The objective of this study was to evaluate, from a medical point of view, the economic impact of the Pontoise Hospital SU. PATIENTS AND METHODS Based on the national cost study (NCS [étude nationale des coûts: ENC]) we analyzed data of five diagnosis related groups (DRG) which have a principle diagnosis in relation with stroke. This work was limited to strokes and transient ischemic events in adults and excluded sub-arachnoid hemorrhage. Medical and economic parameters were collected over the period from January to October 2006 and compared with those of the same period in 2005, that is to say before the opening of the SU. RESULTS Three hundred and twenty-three hospital stays occurred between January 1st and October 31st, 2006 and 216 during the same time period before the opening of the SU, an increase of approximately 50% of all stroke-related admissions in our hospital. The number of stays carried out in the neurology unit increased by 29%. There was no significant difference between the two periods regarding age (median 69 versus 70 years) and sex- ratio. Average length of stay (ALS) was the same (9 days). There were no significant differences concerning the death rate (5.6% versus 6.2%) and that of discharge to home (44.6% versus 44.4%). The cost by stay in 2006 was 3534 euros [median; min 664-max 57,542] versus 3541 euros in 2005 [681-35,149] (p=0.57). Analysis by DRG highlighted an increase in the cost for serious strokes, cerebral infarctions and hemorrhages. For transitory ischemic events, the cost and the ALS decreased. CONCLUSION After the opening of the SU, there was an increase in the activity without an increase in the total cost. This could be related in part to the limited means allocated to the stroke unit at its opening (in particular medical staff). The NCS can be used to evaluate the activity of a stroke unit. This work could be completed on a larger number of units or in several units of different size.
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Affiliation(s)
- F Yekhlef
- Service de neurologie, centre hospitalier René-Dubos, 6, avenue de l'Ile-de-France, 95300 Pontoise, France.
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Peccoud J, Ollivier A, Plantegenest M, Simon JC. A continuum of genetic divergence from sympatric host races to species in the pea aphid complex. Proc Natl Acad Sci U S A 2009; 106:7495-500. [PMID: 19380742 PMCID: PMC2678636 DOI: 10.1073/pnas.0811117106] [Citation(s) in RCA: 254] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Indexed: 11/18/2022] Open
Abstract
Sympatric populations of insects adapted to different host plants, i.e., host races, are good models to investigate how natural selection can promote speciation in the face of ongoing gene flow. However, host races are documented in very few model systems and their gradual evolution into good species, as assumed under a Darwinian view of species formation, lacks strong empirical support. We aim at resolving this uncertainty by investigating host specialization and gene flow among populations of the pea aphid complex, Acyrthosiphon pisum. Genetic markers and tests of host plant specificity indicate the existence of at least 11 well-distinguished sympatric populations associated with different host plants in Western Europe. Population assignment tests show variable migration and hybridization rates among sympatric populations, delineating 8 host races and 3 possible species. Notably, hybridization correlates negatively with genetic differentiation, forming a continuum of population divergence toward virtually complete speciation. The pea aphid complex thus illustrates how ecological divergence can be sustained among many hybridizing populations and how insect host races blend into species by gradual reduction of gene flow.
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Affiliation(s)
- Jean Peccoud
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1099 BiO3P, Domaine de la Motte, 35653 Le Rheu, France; and
| | - Anthony Ollivier
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1099 BiO3P, Domaine de la Motte, 35653 Le Rheu, France; and
| | - Manuel Plantegenest
- Agrocampus Ouest, Unité Mixte de Recherche 1099 BiO3P, 65 rue de St. Brieuc, 35042 Rennes, France
| | - Jean-Christophe Simon
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1099 BiO3P, Domaine de la Motte, 35653 Le Rheu, France; and
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22
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Abstract
Using bone cell cultures, the effects of drugs on cell activities such as proliferation, differentiation, matrix formation, and mineralization can be explored. To quantify these parameters accurately and quickly, a kinetic reproducible computed image analysis procedure of culture dishes is proposed which could be conjointly used with biochemical analysis of the medium. In the present article, different mathematical procedures coupled either with or without histochemical staining are investigated and analyzed. Using serial cross sections and microradiographies of bone nodules, we demonstrated that the gray-level parameter is well correlated with bone mass and/or the mineralization status of the nodules. The procedure selected is a multistep procedure called rapid nodule evaluation (RNE), which uses a binary reconstruction program with different thresholds. To challenge this RNE procedure with the classical Von Kossa staining and quantification procedure, we cultured the cells in the presence of 10 nmol/L dexamethasone and compared the results using the two procedures. The RNE procedure appeared to be accurate and reproducible, and also has the advantage of speed and dynamic analysis over the classical Von Kossa quantification procedure.
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Affiliation(s)
- J R Nefussi
- Laboratoire de Biologie-Odontologie, Université Paris VII, France
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23
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Ollivier A, Rapoport D, Etevenaux J, Guilhaume A, Richardet JM. [Hypotrophy in infants due to emotional deprivation. Study of 18 cases]. Ann Pediatr (Paris) 1983; 30:263-269. [PMID: 6190425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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24
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Rapoport D, Ollivier A. [Hospitalization with his mother of the new-born child and the infant in a general paediatric unit]. Neuropsychiatr Enfance Adolesc 1982; 30:169-73. [PMID: 7121757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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25
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Ollivier A, Rapoport D, Debard A, Richardet JM, Brissaud HE. [Mothers rooming-in in a department of pediatrics (author's transl)]. Arch Fr Pediatr 1981; 38:195-8. [PMID: 7235845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The socio-economic and medical characteristics of a population of 100 children hospitalized in a "mother and child" section of a general pediatric department were studied in order to point out some objective data. This population appears socio-economically privileged. The majority of them are single children, with ages ranging from 0 to 10 years and with many babies under 6 months. There are as many working mothers in this group as in the average population of the department. Types of diseases are varied as the children were not chosen on medical criteria. Lastly, the length of the stay in hospital becomes noticeably shorter.
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26
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Ollivier A, Rapoport D, Debard A, Richardet JM, Brissaud HE. [Mothers rooming-in in a department of pediatrics (author's transl)]. Arch Fr Pediatr 1981; 38:199-205. [PMID: 7235846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In order to better understand the reactions arising from the admission of a child with his mother to the hospital, the reactions of the families, of the hospital staff and of doctors to the permanent presence of the mothers have been analysed. It appears that, in spite of the constraints linked with this type of hospital treatment, it does have positive aspects as compared to the usual type of hospitalization : the organization of the admission, the existence of a single medical contact, a closer observation, a team which works closer together, better possibilities of obtaining information, a shorter stay in hospital; all these improvements could be generalized. However, this concept of hospital treatment is quite demanding for the hospital staff, who must have the support of all the doctors concerned and of the administration.
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27
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Dardenne P, Ollivier A, Belloir A. [The myopathic child's family: a study of 30 Breton families (author's transl)]. Neuropsychiatr Enfance Adolesc 1980; 28:523-537. [PMID: 7231645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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28
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Ollivier A, Diebler C. [Cranial tomodensitometry in Leigh's disease. 1 case]. Nouv Presse Med 1980; 9:2355. [PMID: 7433035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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29
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Ollivier A, Besson-Leaud M, Lavaud J, Bondeux D, Cloup M. [Acute tuberculous meningitis in children. A report on 4 cases (author's transl)]. Sem Hop 1979; 55:1636-40. [PMID: 231837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Four children were treated for acute tuberculous meningitis. One child died and 2 others were left with severe neurological sequellae. The diagnostic and clinical signs of tuberculous meningitis are reviewed. Treatment includes the administration of an association of INH-rifampicine and ethambutol orally, or INH-ethambutol-ethionamide intravenously when oral administration is impossible. Intrathecal injections of rifamycine SV can be given for acute forms. Corticoids have only one indication: intracranial hypertension with cerebral edema, which requires surgical decompression if no improvement is obtained. The fact that cases of tuberculous meningitis are still notified, is a justification for early BCG vaccination and regular control of the tuberculin allergic reaction.
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30
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Ollivier A, Besson-Leaud M. [Principles underlying the use of antituberculosis medication in children (author's transl)]. Sem Hop 1979; 55:1529-35. [PMID: 229564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The authors review the principles underlying antituberculosis therapy in children. Basing their comment on the published literature, they analyze the properties, pharmacology, toxicity, and side-effects of each medication, and define their dosage and modes of administration.
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Ollivier A, Besson-Leaud M, Lavaud J, Bondeux D, Cloup M. [Acute tuberculous meningitis in children. A report on 4 cases]. Ann Pediatr (Paris) 1979; 26:163-7. [PMID: 16108277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
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Ollivier A, Besson-Leaud M. [Principles underlying the use of antituberculosis medication in children]. Ann Pediatr (Paris) 1979; 26:141-7. [PMID: 16108274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
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Narcy M, Ollivier A. [Re-education in cerebral motor handicaps]. Soins 1978; 23:9-14. [PMID: 248987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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