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Stam M, Lelièvre P, Hoebeke M, Corre E, Barbeyron T, Michel G. SulfAtlas, the sulfatase database: state of the art and new developments. Nucleic Acids Res 2022; 51:D647-D653. [PMID: 36318251 PMCID: PMC9825549 DOI: 10.1093/nar/gkac977] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [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: 09/02/2022] [Revised: 10/14/2022] [Accepted: 10/17/2022] [Indexed: 11/06/2022] Open
Abstract
SulfAtlas (https://sulfatlas.sb-roscoff.fr/) is a knowledge-based resource dedicated to a sequence-based classification of sulfatases. Currently four sulfatase families exist (S1-S4) and the largest family (S1, formylglycine-dependent sulfatases) is divided into subfamilies by a phylogenetic approach, each subfamily corresponding to either a single characterized specificity (or few specificities in some cases) or to unknown substrates. Sequences are linked to their biochemical and structural information according to an expert scrutiny of the available literature. Database browsing was initially made possible both through a keyword search engine and a specific sequence similarity (BLAST) server. In this article, we will briefly summarize the experimental progresses in the sulfatase field in the last 6 years. To improve and speed up the (sub)family assignment of sulfatases in (meta)genomic data, we have developed a new, freely-accessible search engine using Hidden Markov model (HMM) for each (sub)family. This new tool (SulfAtlas HMM) is also a key part of the internal pipeline used to regularly update the database. SulfAtlas resource has indeed significantly grown since its creation in 2016, from 4550 sequences to 162 430 sequences in August 2022.
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Affiliation(s)
| | | | - Mark Hoebeke
- Sorbonne Université, CNRS, FR2424, ABiMS, Station Biologique de Roscoff, 29680, Roscoff, Bretagne, France
| | - Erwan Corre
- Sorbonne Université, CNRS, FR2424, ABiMS, Station Biologique de Roscoff, 29680, Roscoff, Bretagne, France
| | - Tristan Barbeyron
- Correspondence may also be addressed to Tristan Barbeyron. Tel: +33 298 29 23 30; Fax: +33 298 29 23 24;
| | - Gurvan Michel
- To whom correspondence should be addressed. Tel: +33 298 29 23 30; Fax: +33 298 29 23 24;
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2
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Caracciolo M, Rigaut-Jalabert F, Romac S, Mahé F, Forsans S, Gac JP, Arsenieff L, Manno M, Chaffron S, Cariou T, Hoebeke M, Bozec Y, Goberville E, Le Gall F, Guilloux L, Baudoux AC, de Vargas C, Not F, Thiébaut E, Henry N, Simon N. Seasonal dynamics of marine protist communities in tidally mixed coastal waters. Mol Ecol 2022; 31:3761-3783. [PMID: 35593305 PMCID: PMC9543310 DOI: 10.1111/mec.16539] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 06/28/2021] [Revised: 12/29/2021] [Accepted: 04/19/2022] [Indexed: 12/01/2022]
Abstract
Major seasonal community reorganizations and associated biomass variations are landmarks of plankton ecology. However, the processes of plankton community turnover rates have not been fully elucidated so far. Here, we analyse patterns of planktonic protist community succession in temperate latitudes, based on quantitative taxonomic data from both microscopy counts (cells >10 μm) and ribosomal DNA metabarcoding (size fraction >3 μm, 18S rRNA gene) from plankton samples collected bimonthly over 8 years (2009–2016) at the SOMLIT‐Astan station (Roscoff, Western English Channel). Based on morphology, diatoms were clearly the dominating group all year round and over the study period. Metabarcoding uncovered a wider diversity spectrum and revealed the prevalence of Dinophyceae and diatoms but also of Cryptophyta, Chlorophyta, Cercozoa, Syndiniales and Ciliophora in terms of read counts and or richness. The use of morphological and molecular analyses in combination allowed improving the taxonomic resolution and to identify the sequence of the dominant species and OTUs (18S V4 rDNA‐derived taxa) that drive annual plankton successions. We detected that some of these dominant OTUs were benthic as a result of the intense tidal mixing typical of the French coasts in the English Channel. Our analysis of the temporal structure of community changes point to a strong seasonality and resilience. The temporal structure of environmental variables (especially Photosynthetic Active Radiation, temperature and macronutrients) and temporal structures generated by species life cycles and or species interactions, are key drivers of the observed cyclic annual plankton turnover.
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Affiliation(s)
| | | | | | | | | | | | - Laure Arsenieff
- Faculty of Biology, Technion - Israel Institute of Technology, Haifa 3200003, Israel
| | | | - Samuel Chaffron
- Research Federation for the study of Global Ocean Systems Ecology and Evolution, FR2022/Tara Oceans GOSEE, 3 rue Michel-Ange, 75016, Paris, France.,Laboratoire des Sciences du Numérique de Nantes (LS2N), CNRS, UMR6004, Université de Nantes, Ecole Centrale de Nantes, 44322, Nantes, France
| | - Thierry Cariou
- Institut de recherche pour le développement (IRD), Délégation Régionale Ouest, IMAGO, Plouzané, France
| | - Mark Hoebeke
- CNRS, Sorbonne Université, FR 2424, ABiMS Platform, Station Biologique de Roscoff, 29680, Roscoff, France
| | | | - Eric Goberville
- Unité biologie des organismes et écosystèmes aquatiques (BOREA), Muséum National D'Histoire Naturelle, Sorbonne Université, Université de Caen Normandie, Université des Antilles, CNRS, IRD, CP53, 61 rue Buffon 75005, Paris, France
| | | | - Loïc Guilloux
- Sorbonne Université, Roscoff, France.,Mediterranean Institute of Oceanography (MIO), Campus de Luminy case 901, 163 Av. de Luminy, 13288 Marseille cedex 9, France
| | | | - Colomban de Vargas
- Sorbonne Université, Roscoff, France.,Research Federation for the study of Global Ocean Systems Ecology and Evolution, FR2022/Tara Oceans GOSEE, 3 rue Michel-Ange, 75016, Paris, France
| | | | - Eric Thiébaut
- Sorbonne Université, Roscoff, France.,Sorbonne Université, CNRS, OSU STAMAR, UMS2017, 4 Place Jussieu, 75252 Paris cedex 05, France
| | - Nicolas Henry
- Sorbonne Université, Roscoff, France.,Research Federation for the study of Global Ocean Systems Ecology and Evolution, FR2022/Tara Oceans GOSEE, 3 rue Michel-Ange, 75016, Paris, France.,CNRS, Sorbonne Université, FR 2424, ABiMS Platform, Station Biologique de Roscoff, 29680, Roscoff, France
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3
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Ferrieux M, Dufour L, Doré H, Ratin M, Guéneuguès A, Chasselin L, Marie D, Rigaut-Jalabert F, Le Gall F, Sciandra T, Monier G, Hoebeke M, Corre E, Xia X, Liu H, Scanlan DJ, Partensky F, Garczarek L. Comparative Thermophysiology of Marine Synechococcus CRD1 Strains Isolated From Different Thermal Niches in Iron-Depleted Areas. Front Microbiol 2022; 13:893413. [PMID: 35615522 PMCID: PMC9124967 DOI: 10.3389/fmicb.2022.893413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 03/31/2022] [Indexed: 11/13/2022] Open
Abstract
Marine Synechococcus cyanobacteria are ubiquitous in the ocean, a feature likely related to their extensive genetic diversity. Amongst the major lineages, clades I and IV preferentially thrive in temperate and cold, nutrient-rich waters, whilst clades II and III prefer warm, nitrogen or phosphorus-depleted waters. The existence of such cold (I/IV) and warm (II/III) thermotypes is corroborated by physiological characterization of representative strains. A fifth clade, CRD1, was recently shown to dominate the Synechococcus community in iron-depleted areas of the world ocean and to encompass three distinct ecologically significant taxonomic units (ESTUs CRD1A-C) occupying different thermal niches, suggesting that distinct thermotypes could also occur within this clade. Here, using comparative thermophysiology of strains representative of these three CRD1 ESTUs we show that the CRD1A strain MITS9220 is a warm thermotype, the CRD1B strain BIOS-U3-1 a cold temperate thermotype, and the CRD1C strain BIOS-E4-1 a warm temperate stenotherm. Curiously, the CRD1B thermotype lacks traits and/or genomic features typical of cold thermotypes. In contrast, we found specific physiological traits of the CRD1 strains compared to their clade I, II, III, and IV counterparts, including a lower growth rate and photosystem II maximal quantum yield at most temperatures and a higher turnover rate of the D1 protein. Together, our data suggests that the CRD1 clade prioritizes adaptation to low-iron conditions over temperature adaptation, even though the occurrence of several CRD1 thermotypes likely explains why the CRD1 clade as a whole occupies most iron-limited waters.
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Affiliation(s)
- Mathilde Ferrieux
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Louison Dufour
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Hugo Doré
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Morgane Ratin
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Audrey Guéneuguès
- Sorbonne Université, CNRS, UMR 7621 Laboratoire d’Océanographie Microbienne (LOMIC), Observatoire Océanologique de Banyuls/mer, Banyuls, France
| | - Léo Chasselin
- Sorbonne Université, CNRS, UMR 7621 Laboratoire d’Océanographie Microbienne (LOMIC), Observatoire Océanologique de Banyuls/mer, Banyuls, France
| | - Dominique Marie
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Fabienne Rigaut-Jalabert
- Sorbonne Université, CNRS, Fédération de Recherche FR2424, Station Biologique de Roscoff, Roscoff, France
| | - Florence Le Gall
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Théo Sciandra
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Garance Monier
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Mark Hoebeke
- CNRS, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), Roscoff, France
| | - Erwan Corre
- CNRS, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), Roscoff, France
| | - Xiaomin Xia
- Key Laboratory of Tropical Marine Bio-Resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
| | - Hongbin Liu
- Department of Ocean Science, The Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR, China
| | - David J. Scanlan
- University of Warwick, School of Life Sciences, Coventry, United Kingdom
| | - Frédéric Partensky
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Laurence Garczarek
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
- CNRS Research Federation (FR2022) Tara Océans GO-SEE, Paris, France
- *Correspondence: Laurence Garczarek,
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4
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Nyssen P, Maho A, Malempre R, Matagne A, Mouithys-Mickalad A, Hoebeke M. Propofol inhibits the myeloperoxidase activity by acting as substrate through a redox process. Biochim Biophys Acta Gen Subj 2022; 1866:130100. [PMID: 35150774 DOI: 10.1016/j.bbagen.2022.130100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 11/24/2021] [Revised: 02/01/2022] [Accepted: 02/01/2022] [Indexed: 01/13/2023]
Abstract
BACKGROUND Propofol (2,6-diisopropylphenol) is frequently used as intravenous anesthetic agent, especially in its injectable form (Diprivan), to initiate and maintain sedative state during surgery or in intensive care units. Numerous studies have reported the antioxidant and anti-inflammatory effect of propofol. The oxidant enzyme myeloperoxidase (MPO), released from activated neutrophils, plays a key role in host defense. An increase of the circulating MPO concentration has been observed in patients admitted in intensive care unit and presenting a systemic inflammatory response related to septic shock or trauma. METHODS This study investigates the immunomodulatory action of propofol and Diprivan as inhibitor of the oxidant activity of MPO. The understanding of the redox action mechanism of propofol and Diprivan on the myeloperoxidase chlorination and peroxidase activities has been refined using the combination of fluorescence and absorption spectroscopies with docking and cyclic voltammetry. RESULTS Propofol acts as a reversible MPO inhibitor. The molecule interacts as a reducing substrate in the peroxidase cycle and promotes the accumulation of compound II. At acidic pH (5.5), propofol and Diprivan do not inhibit the chlorination activity, but their action increases at physiological pH (7.4). The main inhibitory action of Diprivan could be attributed to its HOCl scavenging property. GENERAL SIGNIFICANCE Propofol can act as a reversible MPO inhibitor at clinical concentrations. This property could, in addition to other previously proven anti-inflammatory actions, induce an immunomodulatory action, beneficial during clinical use, particularly in the treatment of systemic inflammation response syndrome.
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Affiliation(s)
- P Nyssen
- Biomedical Spectroscopy Laboratory, Department of Physics, CESAM, University of Liège, Building B5a, Quartier Agora, Allée du 6 Août, 19, Sart-Tilman, 4000 Liège, Belgium.
| | - A Maho
- Greenmat, Department of Chemistry, CESAM, University of Liège, Building B6c, Quartier Agora, Allée du 6 Août, 19, Sart-Tilman, 4000 Liège, Belgium
| | - R Malempre
- Laboratory of Enzymology and Protein folding, Centre for Protein Engineering, InBioS, University of Liège, Building B6a, Quartier Agora, Allée du 6 Août, 19, Sart-Tilman, 4000 Liège, Belgium
| | - A Matagne
- Laboratory of Enzymology and Protein folding, Centre for Protein Engineering, InBioS, University of Liège, Building B6a, Quartier Agora, Allée du 6 Août, 19, Sart-Tilman, 4000 Liège, Belgium
| | - A Mouithys-Mickalad
- CORD, Department of Chemistry, CIRM, University of Liège, Building B6a, Quartier Agora, Allée du 6 Août, 13, Sart-Tilman, 4000 Liège, Belgium
| | - M Hoebeke
- Biomedical Spectroscopy Laboratory, Department of Physics, CESAM, University of Liège, Building B5a, Quartier Agora, Allée du 6 Août, 19, Sart-Tilman, 4000 Liège, Belgium
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5
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Garczarek L, Guyet U, Doré H, Farrant GK, Hoebeke M, Brillet-Guéguen L, Bisch A, Ferrieux M, Siltanen J, Corre E, Le Corguillé G, Ratin M, Pitt FD, Ostrowski M, Conan M, Siegel A, Labadie K, Aury JM, Wincker P, Scanlan DJ, Partensky F. Cyanorak v2.1: a scalable information system dedicated to the visualization and expert curation of marine and brackish picocyanobacteria genomes. Nucleic Acids Res 2021; 49:D667-D676. [PMID: 33125079 PMCID: PMC7779031 DOI: 10.1093/nar/gkaa958] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 09/22/2020] [Accepted: 10/28/2020] [Indexed: 12/05/2022] Open
Abstract
Cyanorak v2.1 (http://www.sb-roscoff.fr/cyanorak) is an information system dedicated to visualizing, comparing and curating the genomes of Prochlorococcus, Synechococcus and Cyanobium, the most abundant photosynthetic microorganisms on Earth. The database encompasses sequences from 97 genomes, covering most of the wide genetic diversity known so far within these groups, and which were split into 25,834 clusters of likely orthologous groups (CLOGs). The user interface gives access to genomic characteristics, accession numbers as well as an interactive map showing strain isolation sites. The main entry to the database is through search for a term (gene name, product, etc.), resulting in a list of CLOGs and individual genes. Each CLOG benefits from a rich functional annotation including EggNOG, EC/K numbers, GO terms, TIGR Roles, custom-designed Cyanorak Roles as well as several protein motif predictions. Cyanorak also displays a phyletic profile, indicating the genotype and pigment type for each CLOG, and a genome viewer (Jbrowse) to visualize additional data on each genome such as predicted operons, genomic islands or transcriptomic data, when available. This information system also includes a BLAST search tool, comparative genomic context as well as various data export options. Altogether, Cyanorak v2.1 constitutes an invaluable, scalable tool for comparative genomics of ecologically relevant marine microorganisms.
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Affiliation(s)
- Laurence Garczarek
- Sorbonne Université & CNRS, UMR 7144 'Adaptation & Diversity in the Marine Environment' (AD2M), Station Biologique de Roscoff (SBR), 29680 Roscoff, France
| | - Ulysse Guyet
- Sorbonne Université & CNRS, UMR 7144 'Adaptation & Diversity in the Marine Environment' (AD2M), Station Biologique de Roscoff (SBR), 29680 Roscoff, France
| | - Hugo Doré
- Sorbonne Université & CNRS, UMR 7144 'Adaptation & Diversity in the Marine Environment' (AD2M), Station Biologique de Roscoff (SBR), 29680 Roscoff, France
| | - Gregory K Farrant
- Sorbonne Université & CNRS, UMR 7144 'Adaptation & Diversity in the Marine Environment' (AD2M), Station Biologique de Roscoff (SBR), 29680 Roscoff, France.,CNRS & Sorbonne Université, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), F-29680 Roscoff, France
| | - Mark Hoebeke
- CNRS & Sorbonne Université, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), F-29680 Roscoff, France
| | - Loraine Brillet-Guéguen
- CNRS & Sorbonne Université, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), F-29680 Roscoff, France.,Sorbonne Université & CNRS, UMR 8227 'Integrative Biology of Marine Models' (LBI2M), Station Biologique de Roscoff (SBR), F-29680 Roscoff, France
| | - Antoine Bisch
- Sorbonne Université & CNRS, UMR 7144 'Adaptation & Diversity in the Marine Environment' (AD2M), Station Biologique de Roscoff (SBR), 29680 Roscoff, France.,CNRS & Sorbonne Université, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), F-29680 Roscoff, France
| | - Mathilde Ferrieux
- Sorbonne Université & CNRS, UMR 7144 'Adaptation & Diversity in the Marine Environment' (AD2M), Station Biologique de Roscoff (SBR), 29680 Roscoff, France
| | - Jukka Siltanen
- CNRS & Sorbonne Université, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), F-29680 Roscoff, France
| | - Erwan Corre
- CNRS & Sorbonne Université, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), F-29680 Roscoff, France
| | - Gildas Le Corguillé
- CNRS & Sorbonne Université, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), F-29680 Roscoff, France
| | - Morgane Ratin
- Sorbonne Université & CNRS, UMR 7144 'Adaptation & Diversity in the Marine Environment' (AD2M), Station Biologique de Roscoff (SBR), 29680 Roscoff, France
| | - Frances D Pitt
- University of Warwick, School of Life Sciences, Coventry CV4 7AL, UK
| | - Martin Ostrowski
- University of Warwick, School of Life Sciences, Coventry CV4 7AL, UK
| | - Maël Conan
- Université de Rennes 1, INSERM, EHESP, IRSET, F-35043 Rennes, France
| | - Anne Siegel
- Université de Rennes 1, INRIA, CNRS, IRISA, F-35000 Rennes, France
| | - Karine Labadie
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, F-91000 Evry, France
| | - Jean-Marc Aury
- Genoscope, Institut de biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, F-91000 Evry, France
| | - Patrick Wincker
- Génomique Métabolique, Genoscope, Institut de biologie François Jacob, CEA, CNRS, Université d'Évry, Université Paris-Saclay, F-91000 Evry, France
| | - David J Scanlan
- University of Warwick, School of Life Sciences, Coventry CV4 7AL, UK
| | - Frédéric Partensky
- Sorbonne Université & CNRS, UMR 7144 'Adaptation & Diversity in the Marine Environment' (AD2M), Station Biologique de Roscoff (SBR), 29680 Roscoff, France
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6
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Doré H, Farrant GK, Guyet U, Haguait J, Humily F, Ratin M, Pitt FD, Ostrowski M, Six C, Brillet-Guéguen L, Hoebeke M, Bisch A, Le Corguillé G, Corre E, Labadie K, Aury JM, Wincker P, Choi DH, Noh JH, Eveillard D, Scanlan DJ, Partensky F, Garczarek L. Evolutionary Mechanisms of Long-Term Genome Diversification Associated With Niche Partitioning in Marine Picocyanobacteria. Front Microbiol 2020; 11:567431. [PMID: 33042072 PMCID: PMC7522525 DOI: 10.3389/fmicb.2020.567431] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 08/12/2020] [Indexed: 12/14/2022] Open
Abstract
Marine picocyanobacteria of the genera Prochlorococcus and Synechococcus are the most abundant photosynthetic organisms on Earth, an ecological success thought to be linked to the differential partitioning of distinct ecotypes into specific ecological niches. However, the underlying processes that governed the diversification of these microorganisms and the appearance of niche-related phenotypic traits are just starting to be elucidated. Here, by comparing 81 genomes, including 34 new Synechococcus, we explored the evolutionary processes that shaped the genomic diversity of picocyanobacteria. Time-calibration of a core-protein tree showed that gene gain/loss occurred at an unexpectedly low rate between the different lineages, with for instance 5.6 genes gained per million years (My) for the major Synechococcus lineage (sub-cluster 5.1), among which only 0.71/My have been fixed in the long term. Gene content comparisons revealed a number of candidates involved in nutrient adaptation, a large proportion of which are located in genomic islands shared between either closely or more distantly related strains, as identified using an original network construction approach. Interestingly, strains representative of the different ecotypes co-occurring in phosphorus-depleted waters (Synechococcus clades III, WPC1, and sub-cluster 5.3) were shown to display different adaptation strategies to this limitation. In contrast, we found few genes potentially involved in adaptation to temperature when comparing cold and warm thermotypes. Indeed, comparison of core protein sequences highlighted variants specific to cold thermotypes, notably involved in carotenoid biosynthesis and the oxidative stress response, revealing that long-term adaptation to thermal niches relies on amino acid substitutions rather than on gene content variation. Altogether, this study not only deciphers the respective roles of gene gains/losses and sequence variation but also uncovers numerous gene candidates likely involved in niche partitioning of two key members of the marine phytoplankton.
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Affiliation(s)
- Hugo Doré
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Gregory K Farrant
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Ulysse Guyet
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Julie Haguait
- LS2N, UMR CNRS 6004, IMT Atlantique, ECN, Université de Nantes, Nantes, France
| | - Florian Humily
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Morgane Ratin
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Frances D Pitt
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
| | - Martin Ostrowski
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
| | - Christophe Six
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Loraine Brillet-Guéguen
- CNRS, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), Roscoff, France.,Sorbonne Université, CNRS, UMR 8227, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Mark Hoebeke
- CNRS, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), Roscoff, France
| | - Antoine Bisch
- CNRS, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), Roscoff, France
| | - Gildas Le Corguillé
- CNRS, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), Roscoff, France
| | - Erwan Corre
- CNRS, FR 2424, ABiMS Platform, Station Biologique de Roscoff (SBR), Roscoff, France
| | - Karine Labadie
- Genoscope, Institut de Biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Évry, France
| | - Jean-Marc Aury
- Genoscope, Institut de Biologie François-Jacob, Commissariat à l'Energie Atomique (CEA), Université Paris-Saclay, Évry, France
| | - Patrick Wincker
- Génomique Métabolique, Genoscope, Institut de Biologie François Jacob, CEA, CNRS, Université d'Evry, Université Paris-Saclay, Évry, France
| | - Dong Han Choi
- Marine Ecosystem Research Center, Korea Institute of Ocean Science and Technology, Busan, South Korea.,Ocean Science and Technology School, Korea Maritime and Ocean University, Busan, South Korea
| | - Jae Hoon Noh
- Marine Ecosystem Research Center, Korea Institute of Ocean Science and Technology, Busan, South Korea.,Department of Marine Biology, Korea University of Science and Technology, Daejeon, South Korea
| | - Damien Eveillard
- LS2N, UMR CNRS 6004, IMT Atlantique, ECN, Université de Nantes, Nantes, France.,Research Federation (FR2022) Tara Océans GO-SEE, Paris, France
| | - David J Scanlan
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
| | - Frédéric Partensky
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
| | - Laurence Garczarek
- Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France.,Research Federation (FR2022) Tara Océans GO-SEE, Paris, France
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7
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Guyet U, Nguyen NA, Doré H, Haguait J, Pittera J, Conan M, Ratin M, Corre E, Le Corguillé G, Brillet-Guéguen L, Hoebeke M, Six C, Steglich C, Siegel A, Eveillard D, Partensky F, Garczarek L. Synergic Effects of Temperature and Irradiance on the Physiology of the Marine Synechococcus Strain WH7803. Front Microbiol 2020; 11:1707. [PMID: 32793165 PMCID: PMC7393227 DOI: 10.3389/fmicb.2020.01707] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 02/27/2020] [Accepted: 06/29/2020] [Indexed: 11/18/2022] Open
Abstract
Understanding how microorganisms adjust their metabolism to maintain their ability to cope with short-term environmental variations constitutes one of the major current challenges in microbial ecology. Here, the best physiologically characterized marine Synechococcus strain, WH7803, was exposed to modulated light/dark cycles or acclimated to continuous high-light (HL) or low-light (LL), then shifted to various stress conditions, including low (LT) or high temperature (HT), HL and ultraviolet (UV) radiations. Physiological responses were analyzed by measuring time courses of photosystem (PS) II quantum yield, PSII repair rate, pigment ratios and global changes in gene expression. Previously published membrane lipid composition were also used for correlation analyses. These data revealed that cells previously acclimated to HL are better prepared than LL-acclimated cells to sustain an additional light or UV stress, but not a LT stress. Indeed, LT seems to induce a synergic effect with the HL treatment, as previously observed with oxidative stress. While all tested shift conditions induced the downregulation of many photosynthetic genes, notably those encoding PSI, cytochrome b6/f and phycobilisomes, UV stress proved to be more deleterious for PSII than the other treatments, and full recovery of damaged PSII from UV stress seemed to involve the neo-synthesis of a fairly large number of PSII subunits and not just the reassembly of pre-existing subunits after D1 replacement. In contrast, genes involved in glycogen degradation and carotenoid biosynthesis pathways were more particularly upregulated in response to LT. Altogether, these experiments allowed us to identify responses common to all stresses and those more specific to a given stress, thus highlighting genes potentially involved in niche acclimation of a key member of marine ecosystems. Our data also revealed important specific features of the stress responses compared to model freshwater cyanobacteria.
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Affiliation(s)
- Ulysse Guyet
- CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | - Ngoc A Nguyen
- CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | - Hugo Doré
- CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | - Julie Haguait
- LS2N, UMR CNRS 6004, IMT Atlantique, ECN, Université de Nantes, Nantes, France
| | - Justine Pittera
- CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | - Maël Conan
- DYLISS (INRIA-IRISA)-INRIA, CNRS UMR 6074, Université de Rennes 1, Rennes, France
| | - Morgane Ratin
- CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | - Erwan Corre
- CNRS, FR2424, ABiMS, Station Biologique, Sorbonne Université, Roscoff, France
| | - Gildas Le Corguillé
- CNRS, FR2424, ABiMS, Station Biologique, Sorbonne Université, Roscoff, France
| | - Loraine Brillet-Guéguen
- CNRS, FR2424, ABiMS, Station Biologique, Sorbonne Université, Roscoff, France.,CNRS, UMR 8227 Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | - Mark Hoebeke
- CNRS, FR2424, ABiMS, Station Biologique, Sorbonne Université, Roscoff, France
| | - Christophe Six
- CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | | | - Anne Siegel
- DYLISS (INRIA-IRISA)-INRIA, CNRS UMR 6074, Université de Rennes 1, Rennes, France
| | - Damien Eveillard
- LS2N, UMR CNRS 6004, IMT Atlantique, ECN, Université de Nantes, Nantes, France
| | - Frédéric Partensky
- CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
| | - Laurence Garczarek
- CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Station Biologique de Roscoff, Sorbonne Université, Roscoff, France
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8
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Nyssen P, Mouithys-Mickalad A, Minguet G, Sauvage E, Wouters J, Franck T, Hoebeke M. Morphine, a potential inhibitor of myeloperoxidase activity. Biochim Biophys Acta Gen Subj 2018; 1862:2236-2244. [DOI: 10.1016/j.bbagen.2018.07.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 07/05/2018] [Accepted: 07/09/2018] [Indexed: 12/22/2022]
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9
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Farrant GK, Hoebeke M, Partensky F, Andres G, Corre E, Garczarek L. WiseScaffolder: an algorithm for the semi-automatic scaffolding of Next Generation Sequencing data. BMC Bioinformatics 2015; 16:281. [PMID: 26335184 PMCID: PMC4559175 DOI: 10.1186/s12859-015-0705-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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: 02/06/2015] [Accepted: 08/17/2015] [Indexed: 01/12/2023] Open
Abstract
Background The sequencing depth provided by high-throughput sequencing technologies has allowed a rise in the number of de novo sequenced genomes that could potentially be closed without further sequencing. However, genome scaffolding and closure require costly human supervision that often results in genomes being published as drafts. A number of automatic scaffolders were recently released, which improved the global quality of genomes published in the last few years. Yet, none of them reach the efficiency of manual scaffolding. Results Here, we present an innovative semi-automatic scaffolder that additionally helps with chimerae resolution and generates valuable contig maps and outputs for manual improvement of the automatic scaffolding. This software was tested on the newly sequenced marine cyanobacterium Synechococcus sp. WH8103 as well as two reference datasets used in previous studies, Rhodobacter sphaeroides and Homo sapiens chromosome 14 (http://gage.cbcb.umd.edu/). The quality of resulting scaffolds was compared to that of three other stand-alone scaffolders: SSPACE, SOPRA and SCARPA. For all three model organisms, WiseScaffolder produced better results than other scaffolders in terms of contiguity statistics (number of genome fragments, N50, LG50, etc.) and, in the case of WH8103, the reliability of the scaffolds was confirmed by whole genome alignment against a closely related reference genome. We also propose an efficient computer-assisted strategy for manual improvement of the scaffolding, using outputs generated by WiseScaffolder, as well as for genome finishing that in our hands led to the circularization of the WH8103 genome. Conclusion Altogether, WiseScaffolder proved more efficient than three other scaffolders for both prokaryotic and eukaryotic genomes and is thus likely applicable to most genome projects. The scaffolding pipeline described here should be of particular interest to biologists wishing to take advantage of the high added value of complete genomes. Electronic supplementary material The online version of this article (doi:10.1186/s12859-015-0705-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Gregory K Farrant
- Sorbonne Universités, UPMC Univ. Paris 06, UMR 7144, Station Biologique, CS 90074, 29688, Roscoff cedex, France.,CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Oceanic Plankton Group, Marine Phototrophic Prokaryotes team, Place Georges Teissier, CS 90074, 29688, Roscoff cedex, France
| | - Mark Hoebeke
- CNRS, FR 2424, ABiMS Platform, Station Biologique, Place Georges Teissier, CS 90074, 29688, Roscoff cedex, France
| | - Frédéric Partensky
- Sorbonne Universités, UPMC Univ. Paris 06, UMR 7144, Station Biologique, CS 90074, 29688, Roscoff cedex, France.,CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Oceanic Plankton Group, Marine Phototrophic Prokaryotes team, Place Georges Teissier, CS 90074, 29688, Roscoff cedex, France
| | - Gwendoline Andres
- CNRS, FR 2424, ABiMS Platform, Station Biologique, Place Georges Teissier, CS 90074, 29688, Roscoff cedex, France
| | - Erwan Corre
- CNRS, FR 2424, ABiMS Platform, Station Biologique, Place Georges Teissier, CS 90074, 29688, Roscoff cedex, France
| | - Laurence Garczarek
- Sorbonne Universités, UPMC Univ. Paris 06, UMR 7144, Station Biologique, CS 90074, 29688, Roscoff cedex, France. .,CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment, Oceanic Plankton Group, Marine Phototrophic Prokaryotes team, Place Georges Teissier, CS 90074, 29688, Roscoff cedex, France.
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10
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Lacroix T, Loux V, Gendrault A, Hoebeke M, Gibrat JF. Insyght: navigating amongst abundant homologues, syntenies and gene functional annotations in bacteria, it's that symbol! Nucleic Acids Res 2014; 42:gku867. [PMID: 25249626 PMCID: PMC4245967 DOI: 10.1093/nar/gku867] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [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] [Indexed: 11/14/2022] Open
Abstract
High-throughput techniques have considerably increased the potential of comparative genomics whilst simultaneously posing many new challenges. One of those challenges involves efficiently mining the large amount of data produced and exploring the landscape of both conserved and idiosyncratic genomic regions across multiple genomes. Domains of application of these analyses are diverse: identification of evolutionary events, inference of gene functions, detection of niche-specific genes or phylogenetic profiling. Insyght is a comparative genomic visualization tool that combines three complementary displays: (i) a table for thoroughly browsing amongst homologues, (ii) a comparator of orthologue functional annotations and (iii) a genomic organization view designed to improve the legibility of rearrangements and distinctive loci. The latter display combines symbolic and proportional graphical paradigms. Synchronized navigation across multiple species and interoperability between the views are core features of Insyght. A gene filter mechanism is provided that helps the user to build a biologically relevant gene set according to multiple criteria such as presence/absence of homologues and/or various annotations. We illustrate the use of Insyght with scenarios. Currently, only Bacteria and Archaea are supported. A public instance is available at http://genome.jouy.inra.fr/Insyght. The tool is freely downloadable for private data set analysis.
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Affiliation(s)
- Thomas Lacroix
- INRA, UR 1077 Mathématique Informatique et Génome, 78352 Jouy-en-Josas, France
| | - Valentin Loux
- INRA, UR 1077 Mathématique Informatique et Génome, 78352 Jouy-en-Josas, France
| | - Annie Gendrault
- INRA, UR 1077 Mathématique Informatique et Génome, 78352 Jouy-en-Josas, France
| | - Mark Hoebeke
- CNRS, UPMC, FR2424, ABiMS, Station Biologique, 29680 Roscoff, France
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11
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Quoilin C, Mouithys-Mickalad A, Lécart S, Fontaine-Aupart MP, Hoebeke M. Evidence of oxidative stress and mitochondrial respiratory chain dysfunction in an in vitro model of sepsis-induced kidney injury. Biochim Biophys Acta 2014; 1837:1790-800. [PMID: 25019585 DOI: 10.1016/j.bbabio.2014.07.005] [Citation(s) in RCA: 113] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 06/29/2014] [Accepted: 07/05/2014] [Indexed: 01/14/2023]
Abstract
To investigate the role of oxidative stress and/or mitochondrial impairment in the occurrence of acute kidney injury (AKI) during sepsis, we developed a sepsis-induced in vitro model using proximal tubular epithelial cells exposed to a bacterial endotoxin (lipopolysaccharide, LPS). This investigation has provided key features on the relationship between oxidative stress and mitochondrial respiratory chain activity defects. LPS treatment resulted in an increase in the expression of inducible nitric oxide synthase (iNOS) and NADPH oxidase 4 (NOX-4), suggesting the cytosolic overexpression of nitric oxide and superoxide anion, the primary reactive nitrogen species (RNS) and reactive oxygen species (ROS). This oxidant state seemed to interrupt mitochondrial oxidative phosphorylation by reducing cytochrome c oxidase activity. As a consequence, disruptions in the electron transport and the proton pumping across the mitochondrial inner membrane occurred, leading to a decrease of the mitochondrial membrane potential, a release of apoptotic-inducing factors and a depletion of adenosine triphosphate. Interestingly, after being targeted by RNS and ROS, mitochondria became in turn producer of ROS, thus contributing to increase the mitochondrial dysfunction. The role of oxidants in mitochondrial dysfunction was further confirmed by the use of iNOS inhibitors or antioxidants that preserve cytochrome c oxidase activity and prevent mitochondrial membrane potential dissipation. These results suggest that sepsis-induced AKI should not only be regarded as failure of energy status but also as an integrated response, including transcriptional events, ROS signaling, mitochondrial activity and metabolic orientation such as apoptosis.
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Affiliation(s)
- C Quoilin
- Laboratory of Biomedical Spectroscopy, Department of Physics, University of Liège, 4000 Liège, Belgium.
| | - A Mouithys-Mickalad
- Center of Oxygen Research and Development, Department of Chemistry, University of Liège, 4000 Liège, Belgium
| | - S Lécart
- Centre de Photonique Biomédicale, CPBM/CLUPS, Fédération LUMAT, University Paris Sud, 91405 Orsay, France
| | - M-P Fontaine-Aupart
- Centre de Photonique Biomédicale, CPBM/CLUPS, Fédération LUMAT, University Paris Sud, 91405 Orsay, France; Institut des Sciences Moléculaires d'Orsay, CNRS and University Paris Sud, 91405 Orsay, France
| | - M Hoebeke
- Laboratory of Biomedical Spectroscopy, Department of Physics, University of Liège, 4000 Liège, Belgium
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12
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Mouithys-Mickalad A, Deby-Dupont G, Hoebeke M, Mathy-Hartert M, Lamy M, Deby C. Effects of sphingosine and sphingosine analogues on the free radical production by stimulated neutrophils: ESR and chemiluminescence studies. Mediators Inflamm 2012; 6:327-33. [PMID: 18472867 PMCID: PMC2365874 DOI: 10.1080/09629359791460] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Sphingolipids inhibit the activation of the neutrophil (PMN) NADPH oxidase by protein kinase C pathway. By electron spin resonance spectroscopy (ESR) and chemiluminescence (CL), we studied the effects of sphingosine (SPN) and ceramide analogues on phorbol 12-myristate 13-acetate (PMA, 5 × 10-7M) stimulated PMN (6 × 106 cells). By ESR with spin trapping (100 mM DMPO: 5,5-dimethyl-1-pyrroline-Noxide), we showed that SPN (5 to 8 × 10-6M), C2-ceramide (N-acetyl SPN) and C6-ceramide (N-hexanoyl SPN) at the final concentration of 2 × 10-5 and 2 × 10-4M inhibit the production of free radicals by stimulated PMN. The ESR spectrum of stimulated PMN was that of DMPO-superoxide anion spin adduct. Inhibition by 5 × 10-6M SPN was equivalent to that of 30 U/ml SOD. SPN (5 to 8 × 10-6M) has no effect
on in vitro systems generating superoxide anion (xanthine 50 mM/xanthine oxidase 110 mU/ml) or hydroxyl radical (Fenton reaction: 88 mM H2O2, 0.01 mM Fe2+ and 0.01 mM EDTA). SPN and N-acetyl SPN also inhibited the CL of PMA stimulated PMN in a dose dependent manner (from 2 × 10-6 to 10-5M), but N-hexanoyl SPN was less active (from 2 × 10-5 to 2 × 10-4M). These effects were compared with those of known PMN inhibitors, superoxide dismutase, catalase and azide. SPN was a better inhibitor compared with these agents. The complete inhibition by SPN of ESR signal and CL of stimulated PMN confirms that this compound or one of its metabolites act at the level of NADPH-oxidase, the key enzyme responsible for production of oxygen-derived free radicals.
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Affiliation(s)
- A Mouithys-Mickalad
- Centre for the Biochemistry of Oxygen, University of Liège, and Department of Anesthesia and Intensive Care Medicine, University Hospital of Liège, Liège 4000 Belgium.
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13
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Nicolas P, Mäder U, Dervyn E, Rochat T, Leduc A, Pigeonneau N, Bidnenko E, Marchadier E, Hoebeke M, Aymerich S, Becher D, Bisicchia P, Botella E, Delumeau O, Doherty G, Denham EL, Fogg MJ, Fromion V, Goelzer A, Hansen A, Härtig E, Harwood CR, Homuth G, Jarmer H, Jules M, Klipp E, Le Chat L, Lecointe F, Lewis P, Liebermeister W, March A, Mars RAT, Nannapaneni P, Noone D, Pohl S, Rinn B, Rügheimer F, Sappa PK, Samson F, Schaffer M, Schwikowski B, Steil L, Stülke J, Wiegert T, Devine KM, Wilkinson AJ, van Dijl JM, Hecker M, Völker U, Bessières P, Noirot P. Condition-dependent transcriptome reveals high-level regulatory architecture in Bacillus subtilis. Science 2012; 335:1103-6. [PMID: 22383849 DOI: 10.1126/science.1206848] [Citation(s) in RCA: 646] [Impact Index Per Article: 53.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Bacteria adapt to environmental stimuli by adjusting their transcriptomes in a complex manner, the full potential of which has yet to be established for any individual bacterial species. Here, we report the transcriptomes of Bacillus subtilis exposed to a wide range of environmental and nutritional conditions that the organism might encounter in nature. We comprehensively mapped transcription units (TUs) and grouped 2935 promoters into regulons controlled by various RNA polymerase sigma factors, accounting for ~66% of the observed variance in transcriptional activity. This global classification of promoters and detailed description of TUs revealed that a large proportion of the detected antisense RNAs arose from potentially spurious transcription initiation by alternative sigma factors and from imperfect control of transcription termination.
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Affiliation(s)
- Pierre Nicolas
- INRA, UR1077, Mathématique Informatique et Génome, Jouy-en-Josas, France
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14
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Abstract
The statistical analysis of array comparative genomic hybridization (CGH) data has now shifted to the joint assessment of copy number variations at the cohort level. Considering multiple profiles gives the opportunity to correct for systematic biases observed on single profiles, such as probe GC content or the so-called "wave effect." In this article, we extend the segmentation model developed in the univariate case to the joint analysis of multiple CGH profiles. Our contribution is multiple: we propose an integrated model to perform joint segmentation, normalization, and calling for multiple array CGH profiles. This model shows great flexibility, especially in the modeling of the wave effect that gives a likelihood framework to approaches proposed by others. We propose a new dynamic programming algorithm for break point positioning, as well as a model selection criterion based on a modified bayesian information criterion proposed in the univariate case. The performance of our method is assessed using simulated and real data sets. Our method is implemented in the R package cghseg.
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Affiliation(s)
- Franck Picard
- Laboratoire de Biometrie et Biologie Evolutive, UMR CNRS 5558 - Univ. Lyon 1, F-69622, Villeurbanne, France.
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15
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Grammenos A, Mouithys-Mickalad A, Guelluy PH, Lismont M, Piel G, Hoebeke M. ESR technique for noninvasive way to quantify cyclodextrins effect on cell membranes. Biochem Biophys Res Commun 2010; 398:350-4. [PMID: 20599748 DOI: 10.1016/j.bbrc.2010.06.050] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Accepted: 06/11/2010] [Indexed: 11/25/2022]
Abstract
A new way to study the action of cyclodextrin was developed to quantify the damage caused on cell membrane and lipid bilayer. The Electron Spin Resonance (ESR) spectroscopy was used to study the action of Randomly methylated-beta-cyclodextrin (Rameb) on living cells (HCT-116). The relative anisotropy observed in ESR spectrum of nitroxide spin probe (5-DSA and cholestane) is directly related to the rotational mobility of the probe, which can be further correlated with the microviscosity. The use of ESR probes clearly shows a close correlation between cholesterol contained in cells and cellular membrane microviscosity. This study also demonstrates the Rameb ability to extract cholesterol and phospholipids in time- and dose-dependent ways. In addition, ESR spectra enabled to establish that cholesterol is extracted from lipid rafts to form stable aggregates. The present work supports that ESR is an easy, reproducible and noninvasive technique to study the effect of cyclodextrins on cell membranes.
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Affiliation(s)
- A Grammenos
- Laboratory of Biomedical Spectroscopy, Department of Physics, B5, University of Liège, Sart-Tilman, Belgium.
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16
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Levecq L, Donckier J, Michel L, Hoebeke M, Godfraind C, Guagnini A, Kozyreff A. 525 Intérêt de l’examen ophtalmologique dans le diagnostic de néoplasie endocrinienne multiple de type 2B. J Fr Ophtalmol 2007. [DOI: 10.1016/s0181-5512(07)80338-x] [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: 11/26/2022]
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17
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Guedj M, Robelin D, Hoebeke M, Lamarine M, Wojcik J, Nuel G. Detecting local high-scoring segments: a first-stage approach for genome-wide association studies. Stat Appl Genet Mol Biol 2006; 5:Article22. [PMID: 17049033 DOI: 10.2202/1544-6115.1192] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Genetic epidemiology aims at identifying biological mechanisms responsible for human diseases. Genome-wide association studies, made possible by recent improvements in genotyping technologies, are now promisingly investigated. In these studies, common first-stage strategies focus on marginal effects but lead to multiple-testing and are unable to capture the possibly complex interplay between genetic factors. We have adapted the use of the local score statistic, already successfully applied to analyse long molecular sequences. Via sum statistics, this method captures local and possible distant dependences between markers. Dedicated to genome-wide association studies, it is fast to compute, able to handle large datasets, circumvents the the multiple-testing problem and outlines a set of genomic regions (segments) for further analyses. Applied to simulated and real data, our approach outperforms classical Bonferroni and FDR corrections for multiple-testing. It is implemented in a software termed LHiSA for Local High-scoring Segments for Association and available at: http://stat.genopole.cnrs.fr/software/lhisa.
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18
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Bryson K, Loux V, Bossy R, Nicolas P, Chaillou S, van de Guchte M, Penaud S, Maguin E, Hoebeke M, Bessières P, Gibrat JF. AGMIAL: implementing an annotation strategy for prokaryote genomes as a distributed system. Nucleic Acids Res 2006; 34:3533-45. [PMID: 16855290 PMCID: PMC1524909 DOI: 10.1093/nar/gkl471] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.4] [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] [Indexed: 11/23/2022] Open
Abstract
We have implemented a genome annotation system for prokaryotes called AGMIAL. Our approach embodies a number of key principles. First, expert manual annotators are seen as a critical component of the overall system; user interfaces were cyclically refined to satisfy their needs. Second, the overall process should be orchestrated in terms of a global annotation strategy; this facilitates coordination between a team of annotators and automatic data analysis. Third, the annotation strategy should allow progressive and incremental annotation from a time when only a few draft contigs are available, to when a final finished assembly is produced. The overall architecture employed is modular and extensible, being based on the W3 standard Web services framework. Specialized modules interact with two independent core modules that are used to annotate, respectively, genomic and protein sequences. AGMIAL is currently being used by several INRA laboratories to analyze genomes of bacteria relevant to the food-processing industry, and is distributed under an open source license.
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Affiliation(s)
| | | | | | | | - S. Chaillou
- Flore Lactique et Environnement Carné, INRA78352 Jouy-en-Josas Cedex, France
| | | | - S. Penaud
- Génétique Microbienne, INRA78352 Jouy-en-Josas Cedex, France
| | - E. Maguin
- Génétique Microbienne, INRA78352 Jouy-en-Josas Cedex, France
| | | | | | - J-F Gibrat
- To whom correspondence should be addressed. Tel: +33 1 34 65 28 97; Fax: +33 1 34 65 29 01; E-mail:
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19
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Brézellec P, Hoebeke M, Hiet MS, Pasek S, Ferat JL. DomainSieve: a protein domain-based screen that led to the identification of dam-associated genes with potential link to DNA maintenance. Bioinformatics 2006; 22:1935-41. [PMID: 16787973 DOI: 10.1093/bioinformatics/btl336] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
MOTIVATION The Dam methyltransferase (DamMT) activity, broadly distributed in association with restriction endonucleases, as part of the restriction-modification defense systems, has evolved to become intimately associated with essential biological functions in a few organisms. In Escherichia coli, DamMT is involved in multiple aspects of DNA maintenance, replication initiation, daughter chromosome segregation, DNA mismatch repair, gene expression control, etc. The participation of DamMT in such a diverse set of functions required that other genes adapted, or emerged through evolution, in response to the DamMT-induced modification of the genomic environment. One example is SeqA, a protein that senses the methylation status of the origin of replication of the chromosome to control the timing of replication initiation. Interestingly, seqA is only present in a few DamMT-specifying proteobacteria. This observation led us to hypothesize that other genes, specifying related functions, might also be found in these organisms. To test this hypothesis, we implemented a large-scale comparative genomic screen meant to identify genes specifying DNA methylation sensing domains, probably involved in DNA maintenance functions. RESULTS We carried out a phylogenetic analysis of DamMT, identifying two contrasting behaviors of the protein. Based on this phylogeny, we defined precisely a set of genomes, in which the protein activity is likely to be involved in DNA maintenance functions, the 'resident' dam genomes. We defined a second set of genomes, in which DamMT is not resident. We developped a new tool, 'DomainSieve', in order to screen these two sets for protein domains that are strictly associated with 'resident' dam genomes. This approach was rewarding and generated a list of genes, among which some, at least, specify activities with clear linkage to DamMT-dependent DNA methylation and DNA maintenance. AVAILABILITY DomainSieve is implemented as a web resource and is accessible at http://stat.genopole.cnrs.fr/ds/.
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Affiliation(s)
- Pierre Brézellec
- Laboratoire Statistique et Génome du CNRS, Tour Evry 2, 523, Place des Terrasses de l'Agora, 91034 Evry Cedex, France
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Abstract
The photochemistry of the anaesthetic agent propofol (PPF) was investigated in three different solvents of quite different polarity (cyclohexane, methanol and phosphate buffer pH 7) by means of nanosecond laser flash photolysis and absorption spectroscopy. GC-MS spectrometry measurements of PPF in cyclohexane have revealed the formation of two major products upon low intensity UV continuous irradiation of PPF in aerated solution: the diphenol derivative of PPF and 2,6-diisopropyl-p-benzoquinone (PPFQ). Only the diphenol compound was obtained in anaerobic solution. PPF phenoxyl radical (PPF ) generation has been assigned as the original step leading to the formation of both the diphenol compound and PPFQ in cyclohexane as revealed by laser flash photolysis at 266 nm and by electron paramagnetic resonance spectroscopy as well. Investigation of PPF by nanosecond flash photolysis at 266 nm in the other solvents revealed the occurrence of different photochemical processes depending on the nature and the polarity of the solvent. A reaction scheme is proposed in order to discuss the mechanism of reaction of PPF in all media.
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Affiliation(s)
- B Heyne
- Department of Physics, Institute of Physics (B5), Biomedical Spectroscopy (C.O.R.D.), University of Liège, Allée du 6 Août, 17, 4000, Liège, Belgium
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Heyne B, Brault D, Fontaine-Aupart MP, Kohnen S, Tfibel F, Mouithys-Mickalad A, Deby-Dupont G, Hans P, Hoebeke M. Reactivity towards singlet oxygen of propofol inside liposomes and neuronal cells. Biochim Biophys Acta Gen Subj 2005; 1724:100-7. [PMID: 15878638 DOI: 10.1016/j.bbagen.2005.04.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2004] [Revised: 03/30/2005] [Accepted: 04/01/2005] [Indexed: 11/21/2022]
Abstract
Singlet oxygen (1O2), a reactive oxygen species, has been found to be implicated in many cellular events and pathological disorders. Herein, we investigated the reactivity of 1O2 towards the anaesthetic agent propofol (PPF) encapsulated within DMPC liposomes. By time resolved luminescence, the rate constant of 1O2 quenching by PPF was evaluated, depending on the location of the sensitizer, with following values: 1.35+/-0.05x10(7) M(-1) s(-1) for deuteroporphyrin (as embedded source) and 0.8+/-0.04x10(7) M(-1) s(-1) for uroporphyrin (as external source), respectively. The nature of the oxidation product, resulting from the reaction of 1O2 with PPF, was determined using absorption and HPLC techniques. Finally, the in vitro protective effect of PPF towards the 1O2-induced neuronal cell toxicity was evaluated in terms of cell viability.
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Affiliation(s)
- B Heyne
- Department of Physics, Institute of Physics (B5), Biomedical Spectroscopy (C.O.R.D.), University of Liège, Allée du 6 Août, 17, 4000 Liège, Belgium
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22
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Giuliani A, Walker IC, Delwiche J, Hoffmann SV, Limão-Vieira P, Mason NJ, Heyne B, Hoebeke M, Hubin-Franskin MJ. The electronic states of 2-furanmethanol (furfuryl alcohol) studied by photon absorption and electron impact spectroscopies. J Chem Phys 2003. [DOI: 10.1063/1.1603733] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Levecq L, Hoebeke M, Guagnini AP, Snyers B. [Diffuse retinal epitheliopathy: study of 30 eyes]. Bull Soc Belge Ophtalmol 2003:55-62. [PMID: 12879725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
Retrospective study of 17 patients (30 eyes) with diffuse retinal epitheliopathy followed for at least 5 years. The study is based on clinical data, ophthalmoscopic findings and fluorescein angiograms. The patients (16 men and 1 woman) are all caucasian with a mean age of 43 years. The disease is bilateral in 13 patients. We report an association with systemic corticosteroid treatment after kidney transplantation in 10 cases. Nine patients have arterial hypertension. Two patients are diabetic and 2 present high level of psychological stress. After a mean follow-up of 12 years, a loss of vision of at least 3 lines is noted in 17 eyes. The decrease in vision is related to an enlargement of the pigment epithelium atrophy to the fovea (15 eyes) or with permanent retrofoveolar serous detachment (2 eyes).
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Affiliation(s)
- L Levecq
- Service d'Ophtalmologie, Université Catholique Louvain, Cliniques Saint-Luc, Belgique
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Abstract
MOTIVATION The availability of increasing amounts of sequence data about completely sequenced genomes spurs the development of new methods in the fields of automated annotation, and of comparative genomics. Tools allowing the visualization of results produced by analysis methods, superimposed on possibly annotated sequence data, and enabling synchronized navigation in multiple genomes, provide new means for interactive genome exploration. This kind of visual inspection can be used as a basis to assess the quality of new analysis algorithms, or to discover genome portions to be subjected to in-depth studies. RESULTS We propose a software package, MuGeN, built for navigating through multiple annotated genomes. It is capable of retrieving annotated sequences in several formats, stored in local files, or available in databases over the network. From these, it then generates an interactive display, or an image file, in most common formats suitable for printing, further editing or integrating in Web pages. Genome maps may be mixed with computer analysis results loaded from XML files, whose format is generic enough to be adapted to a majority of sequence oriented analysis methods. AVAILABILITY MuGeN is available at http://www-mig.jouy.inra.fr/bdsi/MuGeN.
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Affiliation(s)
- Mark Hoebeke
- Unité Mathématique, Informatique & Génome - INRA - Domaine de Vilvert - F 78352 Jouy en Josas CEDEX, France.
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Detrembleur C, Sciannamea V, Koulic C, Claes M, Hoebeke M, Jérôme R. Controlled Nitroxide-Mediated Radical Polymerization of Styrene, Styrene/Acrylonitrile Mixtures, and Dienes Using a Nitrone. Macromolecules 2002. [DOI: 10.1021/ma0201835] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- C. Detrembleur
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - V. Sciannamea
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - C. Koulic
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - M. Claes
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - M. Hoebeke
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
| | - R. Jérôme
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium, and Physique Expérimentale, University of Liège, Sart-Tilman, B6, 4000 Liège, Belgium
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Nicolas P, Bize L, Muri F, Hoebeke M, Rodolphe F, Ehrlich SD, Prum B, Bessières P. Mining Bacillus subtilis chromosome heterogeneities using hidden Markov models. Nucleic Acids Res 2002; 30:1418-26. [PMID: 11884641 PMCID: PMC101363 DOI: 10.1093/nar/30.6.1418] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2001] [Revised: 01/24/2002] [Accepted: 01/24/2002] [Indexed: 11/14/2022] Open
Abstract
We present here the use of a new statistical segmentation method on the Bacillus subtilis chromosome sequence. Maximum likelihood parameter estimation of a hidden Markov model, based on the expectation-maximization algorithm, enables one to segment the DNA sequence according to its local composition. This approach is not based on sliding windows; it enables different compositional classes to be separated without prior knowledge of their content, size and localization. We compared these compositional classes, obtained from the sequence, with the annotated DNA physical map, sequence homologies and repeat regions. The first heterogeneity revealed discriminates between the two coding strands and the non-coding regions. Other main heterogeneities arise; some are related to horizontal gene transfer, some to t-enriched composition of hydrophobic protein coding strands, and others to the codon usage fitness of highly expressed genes. Concerning potential and established gene transfers, we found 9 of the 10 known prophages, plus 14 new regions of atypical composition. Some of them are surrounded by repeats, most of their genes have unknown function or possess homology to genes involved in secondary catabolism, metal and antibiotic resistance. Surprisingly, we notice that all of these detected regions are a + t-richer than the host genome, raising the question of their remote sources.
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Affiliation(s)
- Pierre Nicolas
- Laboratoire de Mathématique, Informatique et Génome, INRA, Route de Saint-Cyr, F-78026 Versailles cedex, France.
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Abstract
MOTIVATION Protein-protein interactions are a potential source of valuable clues in determining the functional role of as yet uncharacterized gene products in metabolic pathways. Graph-like structures emerging from the accumulation of interaction data make it difficult to maintain a consistent and global overview by hand. Bioinformatics tools are needed to perform this graph visualization while maintaining a link to the experimental data. RESULTS "SPiD" is an online database for exploring networks of interacting proteins in Bacillus subtilis characterized by the two-hybrid system. Graphical displays of interaction networks are created dynamically as users interactively navigate through these networks. Third party applications can interface the database through a Common Object Request Broker Architecture (CORBA) tier. AVAILABILITY SPiD is available through its web site at http://www-mig.versailles.inra.fr/bdsi/SPiD, and through an Interoperable Object Reference (IOR) and its associated Interface Definition Language (IDL). CONTACT hoebeke@versailles.inra.fr
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Affiliation(s)
- M Hoebeke
- Unité Mathématique, Informatique & Génome, INRA CRV, Route de St. Cyr, F-78026 Versailles Cedex, France.
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Damoiseau X, Schuitmaker HJ, Lagerberg JW, Hoebeke M. Increase of the photosensitizing efficiency of the Bacteriochlorin a by liposome-incorporation. J Photochem Photobiol B 2001; 60:50-60. [PMID: 11386681 DOI: 10.1016/s1011-1344(01)00118-x] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To describe the action mechanisms of Bacteriochlorin a (BCA), a second generation photosensitizer, in phosphate buffer (PB) and in dimyristoyl phosphatidylcholine (DMPC) liposomes we carried out oxygen consumption and ESR measurements. In PB, where BCA was in a monomer-dimer equilibrium, our results suggested that the oxygen consumption was related to the BCA monomers concentration in solution. Incorporation of BCA in DMPC liposomes, by promoting the monomerization of BCA, increased 9-fold the oxygen consumption in comparison to the value in PB. The use of specific singlet oxygen quenchers (Azide and 9,10-Anthracenedipropionic acid) in ESR and oxygen consumption experiments allowed us to assert that BCA was mainly a type II sensitizer when it was incorporated in DMPC. Finally, the cell survival of WiDr cells after a PDT treatment was measured for cells incubated with BCA in cell culture medium and cells incubated with BCA in DMPC. Irrespective of the dye concentration, the cell survival was lower when liposomes were used. This effect could be the result of a better BCA monomerization and/or a different BCA uptake in cells.
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Affiliation(s)
- X Damoiseau
- Experimental Physics, Institute of Physics, University of Liège, Belgium.
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Hoebeke M, Damoiseau X, Schuitmaker HJ, Van de Vorst A. Fluorescence, absorption and electron spin resonance study of bacteriochlorin a incorporation into membrane models. Biochimica et Biophysica Acta (BBA) - Biomembranes 1999; 1420:73-85. [PMID: 10446292 DOI: 10.1016/s0005-2736(99)00097-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Analysis of the bacteriochlorin a absorption spectra suggests the existence of a monomer-dimer equilibrium, particularly intense in phosphate buffer and favored by a decrease of the pH. The dye in methanolic solution is predominantly in monomeric form. Fluorescence and electron spin resonance nitroxide spin labeling measurements indicate that incorporation into the lipid phase of dimyristoyl-L-alpha-phosphatidylcholine liposomes induces dye monomerization. Moreover, the molecules are bound in the external surface of the vesicles and a complete incorporation is ensured by a lipid-to-dye ratio greater than 125.
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Affiliation(s)
- M Hoebeke
- Department of Experimental Physics, Institute of Physics B5, University of Liège, 4000, Liège, Belgium
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Deckers S, Delgrange E, Hoebeke M, Dahan K, Donckier J. Non-Mediterranean periodic fever. Lancet 1999; 353:382. [PMID: 9950455 DOI: 10.1016/s0140-6736(05)74956-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Mouithys-Mickalad A, Hans P, Deby-Dupont G, Hoebeke M, Deby C, Lamy M. Propofol reacts with peroxynitrite to form a phenoxyl radical: demonstration by electron spin resonance. Biochem Biophys Res Commun 1998; 249:833-7. [PMID: 9731222 DOI: 10.1006/bbrc.1998.9235] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Peroxynitrite (ONOO-), resulting from the reaction of nitric oxide with superoxide anion, is a powerful oxidant produced in activated macrophages, during ischemia-reperfusion processes as well as in neurodegenerative disorders. This study investigated the reaction of the anesthetic agent propofol (PPF) with ONOO-, using electron spin resonance (ESR) and UV-visible spectrometry. Peroxynitrite was synthetized either from acidified hydrogen peroxide and nitrite, or from sodium azide and ozone. The addition of ONOO- to PPF in alkaline solution (pH 12) allowed to detect a, short lifetime, ESR signal corresponding to a phenoxyl radical. This finding was confirmed by a UV-visible study, resulting in the appearance of 427 nm peak and the disappearance of the peak located at 239 nm. The 291 nm peak remained unchanged. The identification of the end-product of the reaction of PPF with ONOO- needs further investigations.
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Deby-Dupont G, Deby C, Mouithys-Mickalad A, Hoebeke M, Mathy-Hartert M, Jadoul L, Vandenberghe A, Lamy M. The antibiotic ceftazidime is a singlet oxygen quencher as demonstrated by ultra-weak chemiluminescence and by inhibition of AAP consumption. Biochim Biophys Acta 1998; 1379:61-8. [PMID: 9468333 DOI: 10.1016/s0304-4165(97)00083-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We demonstrated that the cephalosporin antibiotic ceftazidime (CAZ) deactivated singlet oxygen (1O2). We then studied the mechanisms of the CAZ effects on the ultra weak chemiluminescence (uwCL) associated with the energy decay of 1O2 generated by the Mallet reaction (H2O2 + HOCl --> HCl + H2O + 1O2), and on the anthracene-9,10-dipropionic acid (AAP) consumption by 1O2 generated by irradiation of Rose Bengal (RB). The uwCL generated by the Mallet reaction was amplified (6.2 times) by CAZ. The use of red and blue filters, which absorb radiation below 610 nm and between 470 and 700 nm respectively, demonstrated that CAZ increased the uwCL by a radiation emission at wavelengths shorter than the 633 and 704 nm wavelength emissions of 1O2. CAZ was excited by scavenging the energy excess of 1O2, which so returned to its fundamental state, while CAZ deactivated with light emission between 430-480 nm. CAZ also inhibited in a dose-dependent manner the consumption of AAP by 1O2 generated by the irradiation of RB. The protection of AAP by 5 x 10(-3) M CAZ was equivalent to that of 10(-3) M histidine and 3 X 10(-6) M sodium azide. This process of 1O2 deactivation will be useful in diseases characterized by an excessive PMN activation with a release of activated oxygen species.
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Affiliation(s)
- G Deby-Dupont
- Centre for the Biochemistry of Oxygen, Institute de Chimie, B6a, Domaine Universitaire du Sart Tilman, Liège, Belgium.
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Hoebeke M, Schuitmaker HJ, Jannink LE, Dubbelman TM, Jakobs A, Van de Vorst A. Electron spin resonance evidence of the generation of superoxide anion, hydroxyl radical and singlet oxygen during the photohemolysis of human erythrocytes with bacteriochlorin a. Photochem Photobiol 1997; 66:502-8. [PMID: 9337622 DOI: 10.1111/j.1751-1097.1997.tb03180.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Photodynamic therapy with bacteriochlorin a (BCA) as sensitizer induces damage to red blood cells in vivo. To assess the extent of the contributuion of reactive oxygen species (ROS) and to determine a possible reaction mechanism, competition experiments with assorted ROS quenching or/and enhancing agents were performed in human erythrocytes as model system and in phosphate buffer. In the erythrocyte experiments, a 2% suspension was incubated with BCA for 1 h, washed with phosphate-buffered saline, resuspended and subsequently illuminated with a diode laser using a fluence rate of 2.65 mW/cm2. Potassium leakage and hemolysis were light and BCA dose dependent. Adding tryptophan (3.3 mM), azide (1 mM) or histidine (10 mM) to the erythrocyte suspension before illumination delayed the onset of K-leakage and hemolysis suggesting a type II mechanism. The D2O did not affect K-leakage nor photohemolysis. Adding mannitol (13.3 mM) or glycerol (300 nM) also caused a delay in the onset of K-leakage and hemolysis, suggesting the involvement of radicals. In phosphate buffer experiments, it was shown using electron spin resonance (ESR) associated with spin-trapping techniques that BCA is able to generate O2-. and OH. radicals without production of aqueous electron. Visible or UV irradiation of the dye in the presence of the spin trap 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) gave an ESR spectrum characteristic of the DMPO-hydroxyl radical spin adduct DMPO-OH. Addition of ethanol or sodium formate produced supplementary hyperfine splittings due to the respective CH3CHOH. and CO2-. radical adducts, indicating the presence of free OH.. Production of DMPO-OH was partly inhibited by superoxide dismutase (SOD), catalase and desferrioxamine, suggesting that the iron-catalyzed decomposition of H2O2 was partly involved in the formation of one part of the observed OH.. The complementary inhibition of DMPO-OH production by azide and 9,10-anthracenedipropionic acid (ADPA) was consistent with 1O2 production by BCA followed by reaction of 1O2 with DMPO and decay of the intermediate complex to form DMPO-OH and free OH.. All our results seem to indicate that BCA is a 50%/50% type 1/type 2 sensitizer in buffered aqueous solutions and confirmed that the dye-induced hemolysis of erythrocytes was cell caused by a mixed type 1/type 2 mechanism.
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Affiliation(s)
- M Hoebeke
- Institute of Physics, University of Liège, Belgium
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35
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Ide C, De Coene B, Gilliard C, Pollo C, Hoebeke M, Godfraind C, Trigaux JP. Hemorrhagic arachnoid cyst with third nerve paresis: CT and MR findings. AJNR Am J Neuroradiol 1997; 18:1407-10. [PMID: 9296178 PMCID: PMC8338129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We report the CT and MR appearance of a nontraumatic hemorrhagic arachnoid cyst presenting with a third nerve paresis in a 37-year-old man. The cyst, located in the left suprasellar area, contained a fluid-blood level with stigmata of subacute hemorrhage on both CT and MR studies.
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Affiliation(s)
- C Ide
- Department of Radiology, Cliniques Universitaires UCL de Mont-Godinne, Yvoir, Belgium
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Eloy P, Bertrand B, Martinez M, Hoebeke M, Watelet JB, Jamart J. Endonasal dacryocystorhinostomy: indications, technique and results. Rhinology 1995; 33:229-33. [PMID: 8919217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Dacryocystorhinostomy (DCR) allows an obstructed lachrymal drainage system to be drained into the nasal fossa. Since the development of endonasal microsurgical techniques, the endonasal approach presents itself as an alternative choice to the conventional external approach. It is far less traumatic, yet as efficacious as the conventional approach, and avoids the need for a skin incision and the disruption of the medial canthal structures. Twenty-six patients suffering from lachrymal system obstruction underwent 28 endonasal dacryocystorhinostomies under microscopical (n = 25) or endoscopic control (n = 3). Pre-operative assessment included clinical symptoms (sac swelling, purulent secretions, epiphora) and outflow obstruction on X-rays (conventional dacryocystography and/or subtraction macrodacryocystography). Post-operatively, 23 DCR were free of symptoms. Two presented occasional epiphora and three were unsuccessful. The presence of pre-operative purulent secretions was significantly correlated with post-operative success and with lachrymal sac patency, which is also confirmed by X-ray examination (p<0.001). Thus in cases of purulent secretion with epiphora, X-ray examination is redundant and may be avoided. On the contrary, when epiphora is an isolated symptom, X-rays must be performed in order to determine where the obstruction is located and to provide information on lachrymal sac morphology.
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Affiliation(s)
- P Eloy
- Department of Otorhinolaryngology/Head and Neck Surgery, University Hospital, UCL de Mont-Godinne, Yvoir, Belgium
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Abstract
The various applications of liposomes in understanding photosensitization are described in this paper, with particular emphasis on the various kinds of information that these models allow to obtain in phototherapy. Liposomes are simple vesicles in which an aqueous phase is enclosed by a phospholipidic membrane. They are suitable models mimicking specific situations occurring in vivo and they allow study of the influence of physicochemical, photobiological and biochemical factors on the uptake of photosensitizers by tissues, their mechanisms of action and the subsequent photoinduced tumor necrosis. Moreover, solubilization of the sensitizer into the bilayer seems to improve its tumoral selectivity and its photodynamic efficiency.
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Affiliation(s)
- M Hoebeke
- Laboratory of Experimental Physics, University of Liège, Belgium
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Hoebeke M, Vorst AVD. RESEARCH NOTE ON THE CHARGE-TRANSFER PATHWAY IN THE MEROCYANINE 540 TRIPLET STATE QUENCHING BY NITROXYL RADICAL. Photochem Photobiol 1995. [DOI: 10.1111/j.1751-1097.1995.tb08620.x] [Citation(s) in RCA: 4] [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: 11/28/2022]
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Galand E, Niezette J, Vanderschueren J, Garsou J, Hoebeke M. Variations of lyoluminescence with the commercial origin of the dosimeters. Radiat Phys Chem Oxf Engl 1993 1994. [DOI: 10.1016/0969-806x(94)90031-0] [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: 11/29/2022]
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Hoebeke M, Enescu M, Lindqvist L. Quenching of merocyanine 540 triplet state by nitroxyl radicals in liposomal systems: a laser flash photolysis study. J Photochem Photobiol B 1994; 22:229-33. [PMID: 8014755 DOI: 10.1016/1011-1344(93)06967-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Laser flash photolysis experiments were undertaken to investigate the interaction between stearic acid nitroxide spin probes and photoexcited merocyanine 540 (MC540) in dimyristoyl-L-alpha-phosphatidylcholine liposomes (membrane model). The measurements of the paramagnetic signal decay kinetics of four different spin-labelled stearic acids (n-DSA) show that the direct interaction between the dye and the probe is affected by the position of the nitroxyl group along the carbon chain. Laser flash photolysis results reveal a significant decrease in the MC540 triplet lifetime in the presence of n-DSA, the effect depending on the depth at which the nitroxyl moiety is localized in the bilayer. Previous results on the rate of disappearance of the electron spin resonance (ESR) nitroxide signal on continuous photolysis of the same systems do not show the same dependence on the localization of the nitroxyl moiety in the liposome. Although the MC540 triplet state seems to be implicated in the reaction process, the results suggest that ESR and laser flash experiments demonstrate two different kinds of mechanism.
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Affiliation(s)
- M Hoebeke
- Laboratory of Experimental Physics, University of Liège, Belgium
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Hoebeke M, Seret A, Piette J, Van de Vorst A. Destruction of stearic acid nitroxyl radicals mediated by photoexcited merocyanine 540 in liposomal and micellar systems. Biochemistry 1993; 32:2730-6. [PMID: 8383524 DOI: 10.1021/bi00061a035] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Fatty acid spin labels have been included into liposomes and micelles, in order to study the photochemical behavior of merocyanine 540 toward nitroxyl radicals situated at various depths in the bilayer or the surfactant layer. Visible illumination of the dye, either free in ethanol or bound to liposomes or micelles, leads to the reduction of the electron spin resonance signal of the label. The efficiency of the interaction between merocyanine 540 and spin labels depends on the depth at which the nitroxyl moiety is localized in the micelle or vesicle. Fluorescence measurements indicate that the first excited singlet state of merocyanine 540 is not directly implicated in the reaction mechanism. Flash photolysis experiments conducted in aqueous solutions of hexadecyltrimethylammonium bromide micelles show that the presence of nitroxyl radical decreases the rate constant of triplet decay in a concentration-dependent fashion. The corresponding quenching rate constant (kq) is determined for the different spin labels. The kq values and the reduction rates of ESR signal show the same dependence on the localization of the nitroxyl moiety in the micelles.
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Affiliation(s)
- M Hoebeke
- Laboratory of Experimental Physics, Institute of Physics B5, University of Liège, Belgium
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Legrand-Poels S, Hoebeke M, Vaira D, Rentier B, Piette J. HIV-1 promoter activation following an oxidative stress mediated by singlet oxygen. J Photochem Photobiol B 1993; 17:229-37. [PMID: 8492240 DOI: 10.1016/1011-1344(93)80020-a] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Various biological processes, such as photosensitization or inflammatory reactions, can generate singlet oxygen (1O2) as one of the major oxidative species. Because this oxidant can be generated either extracellularly or intracellularly, it can cause severe damage to various biological macromolecules, even to those deeply embedded inside the cells such as DNA. Sublethal biological modifications induced by different DNA-damaging agents can promote various cellular responses initiated by the activation of various cellular genes and certain heterologous viruses. Since 1O2 fulfils essential prerequisites for a genotoxic substance, we have examined the effects of an oxidative stress, mediated by this species, on cells harbouring a heterologous promoter-leader sequence derived from the human immunodeficiency virus type 1 (HIV-1). Our results demonstrate that HIV-1 long terminal repeat (LTR), integrated into the cellular DNA of epithelial cells, can be transactivated following an oxidative stress mediated by 1O2. In addition, using HIV-1 latently infected promonocytes or lymphocytes, it can be shown that virus reactivation can be induced through a sublethal dose of 1O2 generated intracellularly. An extracellular generation of 1O2 can promote a substantial lethal effect without HIV-1 reactivation. These data may be relevant to the understanding of the events converting a latent infection into a productive one and to the appearance of the acquired immune deficiency syndrome.
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Affiliation(s)
- S Legrand-Poels
- Laboratory of Virology, Institute of Pathology, University of Liège, Belgium
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Abstract
The production of singlet oxygen by merocyanine 540 was studied in dimyristoyl-phosphatidylcholine liposomes using two singlet oxygen probes: 9,10-anthracenedipropionic acid (water soluble) and 9,10-dimethylanthracene (liposoluble). Upper and lower limits of singlet oxygen quantum yield for bound merocyanine 540 were determined to be 0.055 and 0.015 respectively. The diffusion characteristics of singlet oxygen were examined using the isotropic enhancement effect of D2O and the inhibitory effect of sodium azide. It was shown that 1O2 spent more than 87% of its lifetime in a vesicle environment. When the singlet-reacting substrate and the dye were both located in the bilayer, approximately 40% of the singlet oxygen remained in the liposomes where it was originally generated.
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Affiliation(s)
- M Hoebeke
- Institute of Physics B5, University of Liege, Belgium
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Abstract
Monomers and aggregates of Merocyanine 540 (MC540) in water are able to photoisomerize. The shape of the photoisomer absorption spectrum is very similar to that of the ground state. Triplet state of MC540 in water has been produced by energy transfer from triplet anthracene and displays a broad absorption spectrum between 600 and 700 nm. The triplet state may also be produced by direct excitation of MC540 with UV light. However, when the dye is excited by visible light, no triplet state absorbance in the red could be detected so that the triplet yield of MC540 in water seems to be excitation wavelength dependent.
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Affiliation(s)
- A Seret
- Université de Liège, Physique Expérimentale, Institut de Physique, Belgium
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Hoebeke M, Seret A, Piette J, van de Vorst A. Singlet oxygen production and photoisomerization: two competitive processes for merocyanine 540 irradiated with visible light. J Photochem Photobiol B 1988; 1:437-46. [PMID: 3149292 DOI: 10.1016/1011-1344(88)85004-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The quantum yields of singlet oxygen production by merocyanine 540 have been measured during visible light irradiation performed in methanol and ethanol. These appear to be one hundred times smaller than the quantum yield for rose bengal measured under the same conditions. Flash photolysis experiments demonstrate the ability of merocyanine 540 molecules to isomerize under visible light irradiation: the isomerization quantum yields are about 0.65 in both ethanol and methanol. This information combined with the fluorescence quantum yield data account for the low values for singlet oxygen production.
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Affiliation(s)
- M Hoebeke
- Institut de Physique, Université de Liège, Belgium
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