1
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Sana TG, Notopoulou A, Puygrenier L, Decossas M, Moreau S, Carlier A, Krasteva PV. Structures and roles of BcsD and partner scaffold proteins in proteobacterial cellulose secretion. Curr Biol 2024; 34:106-116.e6. [PMID: 38141614 DOI: 10.1016/j.cub.2023.11.057] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/20/2023] [Accepted: 11/27/2023] [Indexed: 12/25/2023]
Abstract
Cellulose is the world's most abundant biopolymer, and similar to its role as a cell wall component in plants, it is a prevalent constituent of the extracellular matrix in bacterial biofilms. Although bacterial cellulose (BC) was first described in the 19th century, it was only recently revealed that it is produced by several distinct types of Bcs secretion systems that feature multiple accessory subunits in addition to a catalytic BcsAB synthase tandem. We recently showed that crystalline cellulose secretion in the Gluconacetobacter genus (α-Proteobacteria) is driven by a supramolecular BcsH-BcsD scaffold-the "cortical belt"-which stabilizes the synthase nanoarrays through an unexpected inside-out mechanism for secretion system assembly. Interestingly, while bcsH is specific for Gluconacetobacter, bcsD homologs are widespread in Proteobacteria. Here, we examine BcsD homologs and their gene neighborhoods from several plant-colonizing β- and γ-Proteobacteria proposed to secrete a variety of non-crystalline and/or chemically modified cellulosic polymers. We provide structural and mechanistic evidence that through different quaternary structure assemblies BcsD acts with proline-rich BcsH, BcsP, or BcsO partners across the proteobacterial clade to form synthase-interacting intracellular scaffolds that, in turn, determine the biofilm strength and architecture in species with strikingly different physiology and secreted biopolymers.
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Affiliation(s)
- Thibault G Sana
- Université de Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, Pessac 33600, France; "Structural Biology of Biofilms" Group, European Institute of Chemistry and Biology (IECB), 2 Rue Robert Escarpit, Pessac 33600, France
| | - Areti Notopoulou
- Université de Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, Pessac 33600, France; "Structural Biology of Biofilms" Group, European Institute of Chemistry and Biology (IECB), 2 Rue Robert Escarpit, Pessac 33600, France
| | - Lucie Puygrenier
- Université de Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, Pessac 33600, France; "Structural Biology of Biofilms" Group, European Institute of Chemistry and Biology (IECB), 2 Rue Robert Escarpit, Pessac 33600, France
| | - Marion Decossas
- Université de Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, Pessac 33600, France; "Structural Biology of Biofilms" Group, European Institute of Chemistry and Biology (IECB), 2 Rue Robert Escarpit, Pessac 33600, France
| | - Sandra Moreau
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan 31326, France
| | - Aurélien Carlier
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan 31326, France; Laboratory of Microbiology, Ghent University, Ghent 9000, Belgium
| | - Petya V Krasteva
- Université de Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, Pessac 33600, France; "Structural Biology of Biofilms" Group, European Institute of Chemistry and Biology (IECB), 2 Rue Robert Escarpit, Pessac 33600, France.
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2
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Vandamme P, Peeters C, Hettiarachchi A, Cnockaert M, Carlier A. Govania unica gen. nov., sp. nov., a rare biosphere bacterium that represents a novel family in the class Alphaproteobacteria. Syst Appl Microbiol 2023; 46:126405. [PMID: 36905873 DOI: 10.1016/j.syapm.2023.126405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 02/14/2023] [Accepted: 02/22/2023] [Indexed: 03/07/2023]
Abstract
Strain LMG 31809 T was isolated from a top soil sample of a temperate, mixed deciduous forest in Belgium. Comparison of its 16S rRNA gene sequence with that of type strains of bacteria with validly published names positioned it in the class Alphaproteobacteria and highlighted a major evolutionary divergence from its near neighbor species which represented species of the orders Emcibacterales and Sphingomonadales. 16S rRNA amplicon sequencing of the same soil sample revealed a highly diverse community in which Acidobacteria and Alphaproteobacteria predominated, but failed to yield amplicon sequence variants highly similar to that of strain LMG 31809 T. There were no metagenome assembled genomes that corresponded to the same species and a comprehensive analysis of public 16S rRNA amplicon sequencing data sets demonstrated that strain LMG 31809 T represents a rare biosphere bacterium that occurs at very low abundances in multiple soil and water-related ecosystems. The genome analysis suggested that this strain is a strictly aerobic heterotroph that is asaccharolytic and uses organic acids and possibly aromatic compounds as growth substrates. We propose to classify LMG 31809 T as a novel species within a novel genus, Govania unica gen. nov., sp. nov, within the novel family Govaniaceae of the class Alphaproteobacteria. Its type strain is LMG 31809 T (=CECT 30155 T). The whole-genome sequence of strain LMG 31809 T has a size of 3.21 Mbp. The G + C content is 58.99 mol%. The 16S rRNA gene and whole-genome sequences of strain LMG 31809 T are publicly available under accession numbers OQ161091 and JANWOI000000000, respectively.
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Affiliation(s)
- Peter Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, 9000 Ghent, Belgium.
| | - Charlotte Peeters
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, 9000 Ghent, Belgium
| | - Amanda Hettiarachchi
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, 9000 Ghent, Belgium
| | - Margo Cnockaert
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, 9000 Ghent, Belgium
| | - Aurélien Carlier
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, 9000 Ghent, Belgium; LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
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3
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Danneels B, Blignaut M, Marti G, Sieber S, Vandamme P, Meyer M, Carlier A. Cyclitol metabolism is a central feature of Burkholderia leaf symbionts. Environ Microbiol 2023; 25:454-472. [PMID: 36451580 DOI: 10.1111/1462-2920.16292] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 11/28/2022] [Indexed: 12/03/2022]
Abstract
The symbioses between plants of the Rubiaceae and Primulaceae families with Burkholderia bacteria represent unique and intimate plant-bacterial relationships. Many of these interactions have been identified through PCR-dependent typing methods, but there is little information available about their functional and ecological roles. We assembled 17 new endophyte genomes representing endophytes from 13 plant species, including those of two previously unknown associations. Genomes of leaf endophytes belonging to Burkholderia s.l. show extensive signs of genome reduction, albeit to varying degrees. Except for one endophyte, none of the bacterial symbionts could be isolated on standard microbiological media. Despite their taxonomic diversity, all endophyte genomes contained gene clusters linked to the production of specialized metabolites, including genes linked to cyclitol sugar analog metabolism and in one instance non-ribosomal peptide synthesis. These genes and gene clusters are unique within Burkholderia s.l. and are likely horizontally acquired. We propose that the acquisition of secondary metabolite gene clusters through horizontal gene transfer is a prerequisite for the evolution of a stable association between these endophytes and their hosts.
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Affiliation(s)
- Bram Danneels
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
- Computational Biology Unit, Department of Informatics, University of Bergen, Norway
| | - Monique Blignaut
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa
| | - Guillaume Marti
- Metatoul-AgromiX Platform, LRSV, Université de Toulouse, CNRS, UT3, INP, Toulouse, France
- MetaboHUB-MetaToul, National Infrastructure of Metabolomics and Fluxomics, Toulouse, France
| | - Simon Sieber
- Department of Chemistry, University of Zurich, Zurich, Switzerland
| | - Peter Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium
| | - Marion Meyer
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa
| | - Aurélien Carlier
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
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4
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De Meyer F, Carlier A. Ecotin: A versatile protease inhibitor of bacteria and eukaryotes. Front Microbiol 2023; 14:1114690. [PMID: 36760512 PMCID: PMC9904509 DOI: 10.3389/fmicb.2023.1114690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 01/04/2023] [Indexed: 01/26/2023] Open
Abstract
Serine protease inhibitors are a large family of proteins involved in important pathways and processes, such as inflammatory responses and blood clotting. Most are characterized by a precise mode of action, thereby targeting a narrow range of protease substrates. However, the serine-protease inhibitor ecotin is able to inhibit a broad range of serine proteases that display a wide range of specificities. This specificity is driven by special structural features which allow unique flexibility upon binding to targets. Although frequently observed in many human/animal-associated bacteria, ecotin homologs may also be found in plant-associated taxa and environmental species. The purpose of this review is to provide an update on the biological importance, role in host-microbe interactions, and evolutionary relationship between ecotin orthologs isolated from Eukaryotic and Prokaryotic species across the Tree of Life.
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Affiliation(s)
- Frédéric De Meyer
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium
| | - Aurélien Carlier
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium,LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France,*Correspondence: Aurélien Carlier, ✉
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5
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Danneels B, Carlier A. Whole-Genome Sequencing of Bacterial Endophytes From Fresh and Preserved Plant Specimens. Methods Mol Biol 2022; 2605:133-155. [PMID: 36520392 DOI: 10.1007/978-1-0716-2871-3_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Many plants harbor symbiotic bacteria in their leaves, sometimes within structures visible with the naked eye. These bacteria play critical roles for host development and defense, but are often not amenable to culture. Gaining insight into the functions of these obligate endophytic bacteria hinges on culture-independent omics approaches, which have seen tremendous development in recent years. We describe in this chapter a set of protocols for the extraction and bioinformatic analysis of bacterial genomic DNA from leaf samples of various origins, including fresh, silica-preserved, or herbarium specimens.
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Affiliation(s)
- Bram Danneels
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France.,CBU, Department of Informatics, University of Bergen, Bergen, Norway
| | - Aurélien Carlier
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France. .,Laboratory of Microbiology, Ghent University, Ghent, Belgium.
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6
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Bartoli C, Boivin S, Marta M, Gris C, Gasciolli V, Gaston M, Auriac MC, Debellé F, Cottret L, Carlier A, Masson-Boivin C, Lepetit M, Lefebvre B. Rhizobium leguminosarum symbiovar viciae strains are natural wheat endophytes that can stimulate root development. Environ Microbiol 2022; 24:5509-5523. [PMID: 35920038 DOI: 10.1111/1462-2920.16148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 07/21/2022] [Accepted: 07/22/2022] [Indexed: 11/26/2022]
Abstract
Although rhizobia that establish a nitrogen-fixing symbiosis with legumes are also known to promote growth in non-legumes, studies on rhizobial associations with wheat roots are scarce. We searched for Rhizobium leguminosarum symbiovar viciae (Rlv) strains naturally competent to endophytically colonize wheat roots. We isolated 20 strains from surface-sterilized wheat roots, and found a low diversity of Rlv compared to that observed in the Rlv species complex. We tested the ability of a subset of these Rlv for wheat root colonization when co-inoculated with other Rlv. Only a few strains, including those isolated from wheat roots, and one strain isolated from pea nodules, were efficient in colonizing roots in co-inoculation conditions, while all the strains tested in single strain inoculation conditions were found to colonize the surface and interior of roots. Furthermore, Rlv strains isolated from wheat roots were able to stimulate root development and early arbuscular mycorrhizal fungi colonization. These responses were strain and host genotype dependent. Our results suggest that wheat can be an alternative host for Rlv; nevertheless, there is a strong competition between Rlv strains for wheat root colonization. In addition, we showed that Rlv are endophytic wheat root bacteria with potential ability to modify wheat development.
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Affiliation(s)
- Claudia Bartoli
- IGEPP, INRAE, Institut Agro, Univ Rennes, 35653, Le Rheu, France.,LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | - Stéphane Boivin
- Laboratoire des Symbioses Tropicales et Méditerranéennes INRAE, IRD, CIRAD, University of Montpellier, Montpellier SupAgro Montpellier, France
| | - Marchetti Marta
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | - Carine Gris
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | | | - Mégane Gaston
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | - Marie-Christine Auriac
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France.,FRAIB-TRI Imaging Platform Facilities, Université de Toulouse, CNRS, 24 chemin de Borderouge, Castanet-Tolosan, France
| | - Frédéric Debellé
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | - Ludovic Cottret
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | - Aurélien Carlier
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | | | - Marc Lepetit
- Laboratoire des Symbioses Tropicales et Méditerranéennes INRAE, IRD, CIRAD, University of Montpellier, Montpellier SupAgro Montpellier, France.,Institut Sophia Agrobiotech INRAE, CNRS, University Côte d'azur, Sophia Antipolis, France
| | - Benoit Lefebvre
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
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Danneels B, Viruel J, Mcgrath K, Janssens SB, Wales N, Wilkin P, Carlier A. Patterns of transmission and horizontal gene transfer in the Dioscorea sansibarensis leaf symbiosis revealed by whole-genome sequencing. Curr Biol 2021; 31:2666-2673.e4. [PMID: 33852872 DOI: 10.1016/j.cub.2021.03.049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 08/18/2020] [Revised: 12/07/2020] [Accepted: 03/15/2021] [Indexed: 11/26/2022]
Abstract
Leaves of the wild yam species Dioscorea sansibarensis display prominent forerunner or "drip" tips filled with extracellular bacteria of the species Orrella dioscoreae.1 This species of yam is native to Madagascar and tropical Africa and reproduces mainly asexually through aerial bulbils and underground tubers, which also contain a small population of O. dioscoreae.2,3 Despite apparent vertical transmission, the genome of O. dioscoreae does not show any of the hallmarks of genome erosion often found in hereditary symbionts (e.g., small genome size and accumulation of pseudogenes).4-6 We investigated here the range and distribution of leaf symbiosis between D. sansibarensis and O. dioscoreae using preserved leaf samples from herbarium collections that were originally collected from various locations in Africa. We recovered DNA from the extracellular symbiont in all samples, showing that the symbiosis is widespread throughout continental Africa and Madagascar. Despite the degraded nature of this DNA, we constructed 17 symbiont genomes using de novo methods without relying on a reference. Phylogenetic and genomic analyses revealed that horizontal transmission of symbionts and horizontal gene transfer have shaped the evolution of the symbiont. These mechanisms could help explain lack of signs of reductive genome evolution despite an obligate host-associated lifestyle. Furthermore, phylogenetic analysis of D. sansibarensis based on plastid genomes revealed a strong geographical clustering of samples and provided evidence that the symbiosis originated at least 13 mya, earlier than previously estimated.3.
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Affiliation(s)
- Bram Danneels
- Laboratory of Microbiology, Ghent University, 9000 Ghent, Belgium
| | - Juan Viruel
- Royal Botanical Gardens, Kew, Richmond, Surrey TW9 3AE, UK
| | - Krista Mcgrath
- Department of Prehistory and Institute of Environmental Science and Technology (ICTA), Autonomous University of Barcelona, 08193 Bellaterra, Spain; Department of Archaeology, University of York, Heslington, York YO10 5DD, UK
| | - Steven B Janssens
- Meise Botanic Garden, 1860 Meise, Belgium; Department of Biology, KU Leuven, 3000 Leuven, Belgium
| | - Nathan Wales
- Department of Archaeology, University of York, Heslington, York YO10 5DD, UK
| | - Paul Wilkin
- Royal Botanical Gardens, Kew, Richmond, Surrey TW9 3AE, UK
| | - Aurélien Carlier
- Laboratory of Microbiology, Ghent University, 9000 Ghent, Belgium; LIPME, Université de Toulouse, INRAE, CNRS, 31320 Castanet-Tolosan, France.
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8
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Qi SS, Cnockaert M, Carlier A, Vandamme PA. Paenibacillus foliorum sp. nov., Paenibacillus phytohabitans sp. nov., Paenibacillus plantarum sp. nov., Paenibacillus planticolens sp. nov., Paenibacillus phytorum sp. nov. and Paenibacillus germinis sp. nov., isolated from the Arabidopsis thaliana phyllosphere. Int J Syst Evol Microbiol 2021; 71. [PMID: 33886446 DOI: 10.1099/ijsem.0.004781] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Six endospore-forming, Gram-stain-positive or variable, motile, rod-shaped, aerobic or facultatively anaerobic bacteria with different MALDI-TOF mass spectra (MS) were isolated from the phyllosphere of Arabidopsis thaliana plants grown in plant chambers after inoculation of surface sterilized seeds with a top soil microbial cell suspension. They were identified as members of the genus Paenibacillus through comparison with a commercial MALDI-TOF MS database and comparative 16S rRNA gene sequencing. Their genome sequences comprised multiple biosynthetic gene clusters and suggested they have unexplored biotechnological potential. Analyses of average nucleotide identity values between these strains and the type strains of their nearest neighbour species demonstrated that they represented a novel Paenibacillus species each. A detailed phenotypic comparison yielded distinctive biochemical characteristics for each of these novel species. We therefore propose to classify that these isolates into six novel species within genus Paenibacillus, for which we propose the names Paenibacillus foliorum sp. nov., Paenibacillus phytohabitans sp. nov., Paenibacillus plantarum sp. nov., Paenibacillus planticolens sp. nov., Paenibacillus phytorum sp. nov. and Paenibacillus germinis sp. nov., with strains LMG 31456T (=R-74617T=CECT 30138T), LMG 31459T (=R-74621T=CECT 30135T), LMG 31461T (=R-74618T=CECT 30133T), LMG 31457T (=R-74619T=CECT 30137T), LMG 31458T (=R-74620T=CECT 30136T) and LMG 31460T (=R-74622T=CECT 30134T) as the type strains, respectively.
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Affiliation(s)
- Shan Shan Qi
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
| | - Margo Cnockaert
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
| | - Aurélien Carlier
- LIPM, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France.,Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
| | - Peter A Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
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Qi SS, Cnockaert M, Carlier A, Vandamme P. Pedobacter gandavensis sp. nov., Pedobacter foliorum sp. nov. and Pedobacter planticolens sp. nov., isolated from leaves of Arabidopsis thaliana. Int J Syst Evol Microbiol 2021; 71. [PMID: 33502299 DOI: 10.1099/ijsem.0.004667] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Three rod-shaped, non-spore-forming, yellow or pale-yellow pigmented bacteria with distinct MALDI-TOF mass spectra were isolated from the phyllosphere of Arabidopsis thaliana seedlings. Their 16S rRNA gene sequences demonstrated that these isolates belong to the genus Pedobacter. The nearest phylogenetic neighbours of strain LMG 31462T were Pedobacter steynii DSM 19110T (98.3 % 16S rRNA sequence similarity) and Pedobacter caeni LMG 22862T (98.3 %); the nearest phylogenetic neighbours of strain LMG 31463T were Pedobacter panaciterrae Gsoil 042T (98.3 %) and Pedobacter nutrimenti DSM 27372T (98.1 %); and the nearest phylogenetic neighbours of strain LMG 31464T were Pedobacter boryungensis BR-9T (99.0 %) and Pedobacter daejeonensis THG-DN3.18T (98.7 %). Average nucleotide identity analyses between the whole genome sequences of the three strains and of the type strains of their respective nearest-neighbour taxa yielded values well below the species delineation threshold and thus confirmed that the three strains represented a novel Pedobacter species each. An extensive phenotypic comparison and an analysis of whole-cell fatty acid components yielded distinctive phenotypic characteristics for each of these strains. We therefore propose to classify these isolates as three novel species, for which we propose the names Pedobacter gandavensis with LMG 31462T (=R-74704T=CECT 30149T) as the type strain, Pedobacter foliorum with LMG 31463T (=R-74623T=CECT 30150T) as the type strain and Pedobacter planticolens with LMG 31464T (=R-74626T=CECT 30151T) as the type strain.
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Affiliation(s)
- Shan Shan Qi
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
| | - Margo Cnockaert
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
| | - Aurélien Carlier
- LIPM, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France.,Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
| | - Peter Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
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10
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Qi SS, Bogdanov A, Cnockaert M, Acar T, Ranty-Roby S, Coenye T, Vandamme P, König GM, Crüsemann M, Carlier A. Induction of antibiotic specialized metabolism by co-culturing in a collection of phyllosphere bacteria. Environ Microbiol 2021; 23:2132-2151. [PMID: 33393154 DOI: 10.1111/1462-2920.15382] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 12/29/2020] [Indexed: 01/04/2023]
Abstract
A diverse set of bacteria live on the above-ground parts of plants, composing the phyllosphere, and play important roles for plant health. Phyllosphere microbial communities assemble in a predictable manner and diverge from communities colonizing other plant organs or the soil. However, how these communities differ functionally remains obscure. We assembled a collection of 258 bacterial isolates representative of the most abundant taxa of the phyllosphere of Arabidopsis and a shared soil inoculum. We screened the collection for the production of metabolites that inhibit the growth of Gram-positive and Gram-negative bacteria either in isolation or in co-culture. We found that isolates capable of constitutive antibiotic production in monoculture were significantly enriched in the soil fraction. In contrast, the proportion of binary cultures resulting in the production of growth inhibitory compounds differed only marginally between the phyllosphere and soil fractions. This shows that the phyllosphere may be a rich resource for potentially novel molecules with antibiotic activity, but that production or activity is dependent upon induction by external signals or cues. Finally, we describe the isolation of antimicrobial acyloin metabolites from a binary culture of Arabidopsis phyllosphere isolates, which inhibit the growth of clinically relevant Acinetobacter baumannii.
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Affiliation(s)
- Shan Shan Qi
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Alexander Bogdanov
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, Bonn, 53115, Germany.,Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, California
| | - Margo Cnockaert
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Tessa Acar
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium.,LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | - Sarah Ranty-Roby
- LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | - Tom Coenye
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Peter Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Gabriele M König
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, Bonn, 53115, Germany
| | - Max Crüsemann
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, Bonn, 53115, Germany
| | - Aurélien Carlier
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium.,LIPME, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
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11
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Goussarov G, Cleenwerck I, Mysara M, Leys N, Monsieurs P, Tahon G, Carlier A, Vandamme P, Van Houdt R. PaSiT: a novel approach based on short-oligonucleotide frequencies for efficient bacterial identification and typing. Bioinformatics 2020; 36:2337-2344. [PMID: 31899493 PMCID: PMC7178395 DOI: 10.1093/bioinformatics/btz964] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 11/21/2019] [Accepted: 12/30/2019] [Indexed: 11/13/2022] Open
Abstract
MOTIVATION One of the most widespread methods used in taxonomy studies to distinguish between strains or taxa is the calculation of average nucleotide identity. It requires a computationally expensive alignment step and is therefore not suitable for large-scale comparisons. Short oligonucleotide-based methods do offer a faster alternative but at the expense of accuracy. Here, we aim to address this shortcoming by providing a software that implements a novel method based on short-oligonucleotide frequencies to compute inter-genomic distances. RESULTS Our tetranucleotide and hexanucleotide implementations, which were optimized based on a taxonomically well-defined set of over 200 newly sequenced bacterial genomes, are as accurate as the short oligonucleotide-based method TETRA and average nucleotide identity, for identifying bacterial species and strains, respectively. Moreover, the lightweight nature of this method makes it applicable for large-scale analyses. AVAILABILITY AND IMPLEMENTATION The method introduced here was implemented, together with other existing methods, in a dependency-free software written in C, GenDisCal, available as source code from https://github.com/LM-UGent/GenDisCal. The software supports multithreading and has been tested on Windows and Linux (CentOS). In addition, a Java-based graphical user interface that acts as a wrapper for the software is also available. SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Gleb Goussarov
- Microbiology Unit, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
- Laboratory of Microbiology and BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Ilse Cleenwerck
- Laboratory of Microbiology and BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Mohamed Mysara
- Microbiology Unit, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
| | - Natalie Leys
- Microbiology Unit, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
| | - Pieter Monsieurs
- Microbiology Unit, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
| | - Guillaume Tahon
- Laboratory of Microbiology and BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Aurélien Carlier
- Laboratory of Microbiology and BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
- LIPM, Université de Toulouse, INRAE, CNRS, Castanet-Tolosan, France
| | - Peter Vandamme
- Laboratory of Microbiology and BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Rob Van Houdt
- Microbiology Unit, Belgian Nuclear Research Centre (SCK•CEN), Mol, Belgium
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12
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Dumolin C, Aerts M, Verheyde B, Schellaert S, Vandamme T, Van der Jeugt F, De Canck E, Cnockaert M, Wieme AD, Cleenwerck I, Peiren J, Dawyndt P, Vandamme P, Carlier A. Introducing SPeDE: High-Throughput Dereplication and Accurate Determination of Microbial Diversity from Matrix-Assisted Laser Desorption-Ionization Time of Flight Mass Spectrometry Data. mSystems 2019; 4:e00437-19. [PMID: 31506264 PMCID: PMC6739102 DOI: 10.1128/msystems.00437-19] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 08/23/2019] [Indexed: 12/22/2022] Open
Abstract
The isolation of microorganisms from microbial community samples often yields a large number of conspecific isolates. Increasing the diversity covered by an isolate collection entails the implementation of methods and protocols to minimize the number of redundant isolates. Matrix-assisted laser desorption-ionization time-of-flight (MALDI-TOF) mass spectrometry methods are ideally suited to this dereplication problem because of their low cost and high throughput. However, the available software tools are cumbersome and rely either on the prior development of reference databases or on global similarity analyses, which are inconvenient and offer low taxonomic resolution. We introduce SPeDE, a user-friendly spectral data analysis tool for the dereplication of MALDI-TOF mass spectra. Rather than relying on global similarity approaches to classify spectra, SPeDE determines the number of unique spectral features by a mix of global and local peak comparisons. This approach allows the identification of a set of nonredundant spectra linked to operational isolation units. We evaluated SPeDE on a data set of 5,228 spectra representing 167 bacterial strains belonging to 132 genera across six phyla and on a data set of 312 spectra of 78 strains measured before and after lyophilization and subculturing. SPeDE was able to dereplicate with high efficiency by identifying redundant spectra while retrieving reference spectra for all strains in a sample. SPeDE can identify distinguishing features between spectra, and its performance exceeds that of established methods in speed and precision. SPeDE is open source under the MIT license and is available from https://github.com/LM-UGent/SPeDEIMPORTANCE Estimation of the operational isolation units present in a MALDI-TOF mass spectral data set involves an essential dereplication step to identify redundant spectra in a rapid manner and without sacrificing biological resolution. We describe SPeDE, a new algorithm which facilitates culture-dependent clinical or environmental studies. SPeDE enables the rapid analysis and dereplication of isolates, a critical feature when long-term storage of cultures is limited or not feasible. We show that SPeDE can efficiently identify sets of similar spectra at the level of the species or strain, exceeding the taxonomic resolution of other methods. The high-throughput capacity, speed, and low cost of MALDI-TOF mass spectrometry and SPeDE dereplication over traditional gene marker-based sequencing approaches should facilitate adoption of the culturomics approach to bacterial isolation campaigns.
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Affiliation(s)
- Charles Dumolin
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Maarten Aerts
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Bart Verheyde
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Simon Schellaert
- Computational Biology Laboratory, Department of Applied Mathematics, Computer Science and Statistics, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Tim Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Felix Van der Jeugt
- Computational Biology Laboratory, Department of Applied Mathematics, Computer Science and Statistics, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Evelien De Canck
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Margo Cnockaert
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Anneleen D Wieme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
- BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Ilse Cleenwerck
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
- BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Jindrich Peiren
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
- BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Peter Dawyndt
- Computational Biology Laboratory, Department of Applied Mathematics, Computer Science and Statistics, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Peter Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
- BCCM/LMG Bacteria Collection, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Aurélien Carlier
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
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Amadou C, Carlier A, Amouyal C, Bourron O, Aubert C, Couture T, Fourniols E, Ha Van G, Rouanet S, Hartemann A. Five-year mortality in patients with diabetic foot ulcer during 2009-2010 was lower than expected. Diabetes Metab 2019; 46:230-235. [PMID: 31400509 DOI: 10.1016/j.diabet.2019.04.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Revised: 04/03/2019] [Accepted: 04/07/2019] [Indexed: 11/24/2022]
Abstract
AIM Mortality rates are decreasing in patients with diabetes. However, as this observation also concerns patients with diabetic foot ulcer (DFU), additional data are needed. For this reason, our study evaluated the 5-year mortality rate in patients with DFU during 2009-2010 and identified risk factors associated with mortality. METHODS Consecutive patients who attended a clinic for new DFU during 2009-2010 were followed until healing and at 1 year. Data on mortality were collected at year 5. Multivariate Cox proportional-hazards model was used to identify mortality risk factors. RESULTS A total of 347 patients were included: mean age was 65±12 years, diabetes duration was 16 [10; 27] years; 13% were on dialysis; and 7% had an organ transplant. At 5 years, 49 patients (14%) were considered lost to follow-up. Total mortality rate at 5 years was 35%, and 16% in patients with neuropathy. On multivariate analyses, mortality was positively associated with: age [hazard ratio (HR): 1.05 (1.03-1.07), P<0.0001]; duration of diabetes [HR: 1.02 (1.001-1.03], P=0.03]; PEDIS perfusion grade 2 vs. 1 [HR: 2.35 (1.28-4.29), P=0.006)]; PEDIS perfusion grade 3 vs. 1 [HR: 3.14 (1.58-6.24), P=0.001); and ulcer duration at year 1 [HR 2.09 (1.35-3.22), P=0.0009]. CONCLUSION Mortality rates were not as high as expected despite the large number of comorbidities, suggesting that progress has been made in the health management of these patients. In particular, patients with neuropathic foot ulcer had a survival rate of 84% at 5 years.
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Affiliation(s)
- C Amadou
- Diabetology department, Pitié-Salpêtrière Hospital, AP-HP, 83, boulevard de l'Hôpital, 75013 Paris, France
| | - A Carlier
- Diabetology department, Pitié-Salpêtrière Hospital, AP-HP, 83, boulevard de l'Hôpital, 75013 Paris, France; Inserm, CIC-1421, Department of Pharmacology, Pitié-Salpêtrière Hospital, AP-HP, 83, boulevard de l'Hôpital, 75013 Paris, France; Sorbonne Université, 91, boulevard de l'Hôpital, 75013 Paris, France
| | - C Amouyal
- Inserm, Sorbonne-Université, Research Unit on Cardiovascular, Metabolic and Nutrition Diseases (UMRS-1166), Institute of Cardiometabolism and Nutrition, 91, boulevard de l'Hôpital, 75013 Paris, France
| | - O Bourron
- Diabetology department, Pitié-Salpêtrière Hospital, AP-HP, 83, boulevard de l'Hôpital, 75013 Paris, France; Inserm, CIC-1421, Department of Pharmacology, Pitié-Salpêtrière Hospital, AP-HP, 83, boulevard de l'Hôpital, 75013 Paris, France; Sorbonne Université, 91, boulevard de l'Hôpital, 75013 Paris, France
| | - C Aubert
- Department of Internal Medicine, Fribourg Hospital, Fribourg, Switzerland
| | - T Couture
- Sorbonne Université, 91, boulevard de l'Hôpital, 75013 Paris, France; Department of Vascular Surgery, Pitié-Salpêtrière Hospital, AP-HP, 83, boulevard de l'Hôpital, 75013 Paris, France
| | - E Fourniols
- Department of Orthopedic Surgery, Pitié-Salpêtrière Hospital, AP-HP, 83, boulevard de l'Hôpital, 75013 Paris, France
| | - G Ha Van
- Diabetology department, Pitié-Salpêtrière Hospital, AP-HP, 83, boulevard de l'Hôpital, 75013 Paris, France
| | - S Rouanet
- StatEthic SASU, 73, rue Paul-Vaillant-Couturier, 92300 Levallois-Perret, France
| | - A Hartemann
- Diabetology department, Pitié-Salpêtrière Hospital, AP-HP, 83, boulevard de l'Hôpital, 75013 Paris, France; Inserm, CIC-1421, Department of Pharmacology, Pitié-Salpêtrière Hospital, AP-HP, 83, boulevard de l'Hôpital, 75013 Paris, France; Sorbonne Université, 91, boulevard de l'Hôpital, 75013 Paris, France.
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14
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Hsiao CC, Sieber S, Georgiou A, Bailly A, Emmanouilidou D, Carlier A, Eberl L, Gademann K. Synthesis and Biological Evaluation of the Novel Growth Inhibitor Streptol Glucoside, Isolated from an Obligate Plant Symbiont. Chemistry 2019; 25:1722-1726. [PMID: 30508325 DOI: 10.1002/chem.201805693] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 11/29/2018] [Indexed: 12/23/2022]
Abstract
The plant Psychotria kirkii hosts an obligatory bacterial symbiont, Candidatus Burkholderia kirkii, in nodules on their leaves. Recently, a glucosylated derivative of (+)-streptol, (+)-streptol glucoside, was isolated from the nodulated leaves and was found to possess a plant growth inhibitory activity. To establish a structure-activity relationship study, a convergent strategy was developed to obtain several pseudosugars from a single synthetic precursor. Furthermore, the glucosylation of streptol was investigated in detail and conditions affording specifically the α or β glucosidic anomer were identified. Although (+)-streptol was the most active compound, its concentration in P. kirkii plant leaves extract was approximately ten-fold lower than that of (+)-streptol glucoside. These results provide compelling evidence that the glucosylation of (+)-streptol protects the plant host against the growth inhibitory effect of the compound, which might constitute a molecular cornerstone for this successful plant-bacteria symbiosis.
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Affiliation(s)
- Chien-Chi Hsiao
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Simon Sieber
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Antri Georgiou
- Institute of Plant and Microbial Biology, University of Zürich, Zollikerstrasse 107, 8008, Zürich, Switzerland
| | - Aurélien Bailly
- Institute of Plant and Microbial Biology, University of Zürich, Zollikerstrasse 107, 8008, Zürich, Switzerland
| | - Despina Emmanouilidou
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Aurélien Carlier
- Institute of Plant and Microbial Biology, University of Zürich, Zollikerstrasse 107, 8008, Zürich, Switzerland
| | - Leo Eberl
- Institute of Plant and Microbial Biology, University of Zürich, Zollikerstrasse 107, 8008, Zürich, Switzerland
| | - Karl Gademann
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
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15
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Carlier A, Gerritse F. [Machine learning in predicting suicide: something for the future?]. Tijdschr Psychiatr 2019; 61:835-836. [PMID: 31907897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
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16
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Tahon G, Tytgat B, Lebbe L, Carlier A, Willems A. Abditibacterium utsteinense sp. nov., the first cultivated member of candidate phylum FBP, isolated from ice-free Antarctic soil samples. Syst Appl Microbiol 2018; 41:279-290. [DOI: 10.1016/j.syapm.2018.01.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 01/20/2018] [Accepted: 01/29/2018] [Indexed: 10/18/2022]
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17
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Carlier A, van Exel E, Dols A, Bouckaert F, Sienaert P, Ten Kate M, Wattjes MP, Vandenbulcke M, Stek ML, Rhebergen D. The course of apathy in late-life depression treated with electroconvulsive therapy; a prospective cohort study. Int J Geriatr Psychiatry 2018; 33:1253-1259. [PMID: 29851173 DOI: 10.1002/gps.4917] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 04/17/2018] [Indexed: 11/06/2022]
Abstract
OBJECTIVES Apathy, a lack of motivation, is frequently seen in older individuals, with and without depression, with substantial impact on quality of life. This prospective cohort study of patients with severe late-life depression treated with electroconvulsive therapy (ECT) aims to study the course of apathy and the predictive value of vascular burden and in particular white matter hyperintensities on apathy course. METHODS Information on apathy (defined by a score of >13 on the Apathy Scale), depression severity, vascular burden, and other putative confounders was collected in at 2 psychiatric hospitals on patients with late-life depression (aged 55 to 87 years, N = 73). MRI data on white matter hyperintensities were available in 52 patients. Possible risk factors for apathy post-ECT were determined using regression analyses. RESULTS After treatment with ECT, 52.0% (26/50) of the depression remitters still suffered from clinically relevant apathy symptoms. In the entire cohort, more patients remained apathetic (58.9%) than depressed (31.5%). Presence of apathy post-ECT was not associated with higher age, use of benzodiazepines, or severity of apathy and depression at baseline. Less response in depressive symptomatology after ECT predicted post-treatment apathy. The presence of vascular disease, diabetes mellitus and smoking, and white matter hyperintensities in the brain was not associated with post-treatment apathy. CONCLUSIONS Apathy may perpetuate in individual patients, despite remission of depressive symptoms. In this cohort of patients with late-life depression, post-ECT apathy is not associated with white matter hyperintensities.
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Affiliation(s)
- A Carlier
- Department of Psychiatry, Academic Medical Center, University of Amsterdam, The Netherlands
| | - E van Exel
- Department of Old Age Psychiatry, GGZ inGeest/VU University Medical Center, Amsterdam, The Netherlands
- Amsterdam Public Health research institute and NCA Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - A Dols
- Department of Old Age Psychiatry, GGZ inGeest/VU University Medical Center, Amsterdam, The Netherlands
- Amsterdam Public Health research institute and NCA Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - F Bouckaert
- Old-age Psychiatry, KU Leuven, University Psychiatric Center KU Leuven, Leuven/Kortenberg, Belgium
- Academic Center for ECT and Neuromodulation, KU Leuven, University Psychiatric Center KU Leuven, Leuven, Belgium
| | - P Sienaert
- Academic Center for ECT and Neuromodulation, KU Leuven, University Psychiatric Center KU Leuven, Leuven, Belgium
| | - M Ten Kate
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands
| | - M P Wattjes
- Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands
| | - M Vandenbulcke
- Old-age Psychiatry, KU Leuven, University Psychiatric Center KU Leuven, Leuven/Kortenberg, Belgium
| | - M L Stek
- Department of Old Age Psychiatry, GGZ inGeest/VU University Medical Center, Amsterdam, The Netherlands
- Amsterdam Public Health research institute and NCA Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - D Rhebergen
- Department of Old Age Psychiatry, GGZ inGeest/VU University Medical Center, Amsterdam, The Netherlands
- Amsterdam Public Health research institute and NCA Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
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18
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Carlier A, Vasilevich A, Marechal M, de Boer J, Geris L. In silico clinical trials for pediatric orphan diseases. Sci Rep 2018; 8:2465. [PMID: 29410461 PMCID: PMC5802824 DOI: 10.1038/s41598-018-20737-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 01/15/2018] [Indexed: 12/14/2022] Open
Abstract
To date poor treatment options are available for patients with congenital pseudarthrosis of the tibia (CPT), a pediatric orphan disease. In this study we have performed an in silico clinical trial on 200 virtual subjects, generated from a previously established model of murine bone regeneration, to tackle the challenges associated with the small, pediatric patient population. Each virtual subject was simulated to receive no treatment and bone morphogenetic protein (BMP) treatment. We have shown that the degree of severity of CPT is significantly reduced with BMP treatment, although the effect is highly subject-specific. Using machine learning techniques we were also able to stratify the virtual subject population in adverse responders, non-responders, responders and asymptomatic. In summary, this study shows the potential of in silico medicine technologies as well as their implications for other orphan diseases.
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Affiliation(s)
- A Carlier
- Biomechanics Section, KU Leuven, Celestijnenlaan 300C, PB 2419, 3000 Leuven, Belgium and Biomechanics Research Unit, University of Liège, Chemin des Chevreuils 1 - BAT 52/3, 4000, Liège 1, Belgium.,Prometheus, Division of Skeletal Tissue Engineering, KU Leuven, O&N 1, Herestraat 49, PB 813, 3000, Leuven, Belgium.,MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Universiteitssingel 40, 6229 ER, Maastricht, The Netherlands
| | - A Vasilevich
- MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Universiteitssingel 40, 6229 ER, Maastricht, The Netherlands
| | - M Marechal
- Prometheus, Division of Skeletal Tissue Engineering, KU Leuven, O&N 1, Herestraat 49, PB 813, 3000, Leuven, Belgium.,Skeletal Biology and Engineering Research Center, KU Leuven, O&N 1, Herestraat 49, PB 813, 3000, Leuven, Belgium
| | - J de Boer
- MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Universiteitssingel 40, 6229 ER, Maastricht, The Netherlands
| | - L Geris
- Biomechanics Section, KU Leuven, Celestijnenlaan 300C, PB 2419, 3000 Leuven, Belgium and Biomechanics Research Unit, University of Liège, Chemin des Chevreuils 1 - BAT 52/3, 4000, Liège 1, Belgium. .,Prometheus, Division of Skeletal Tissue Engineering, KU Leuven, O&N 1, Herestraat 49, PB 813, 3000, Leuven, Belgium.
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Crüsemann M, Reher R, Schamari I, Brachmann AO, Ohbayashi T, Kuschak M, Malfacini D, Seidinger A, Pinto‐Carbó M, Richarz R, Reuter T, Kehraus S, Hallab A, Attwood M, Schiöth HB, Mergaert P, Kikuchi Y, Schäberle TF, Kostenis E, Wenzel D, Müller CE, Piel J, Carlier A, Eberl L, König GM. Heterologous Expression, Biosynthetic Studies, and Ecological Function of the Selective Gq‐Signaling Inhibitor FR900359. Angew Chem Int Ed Engl 2018; 57:836-840. [DOI: 10.1002/anie.201707996] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 10/25/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Max Crüsemann
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Germany
| | - Raphael Reher
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Germany
| | - Isabella Schamari
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Germany
| | - Alexander O. Brachmann
- Institut für MikrobiologieEidgenössische Technische Hochschule (ETH) Zürich Vladimir-Prelog Weg 4 8093 Zürich Switzerland
| | - Tsubasa Ohbayashi
- Institute for Integrative Biology of the Cell, UMR9198CNRSUniversité Paris‐Sud, CEA Avenue de la Terrasse Gif-sur-Yvette 91198 France
| | - Markus Kuschak
- PharmaCenter BonnPharmazeutisches InstitutPharmazeutische Chemie IUniversität Bonn An der Immenburg 4 53121 Bonn Germany
| | - Davide Malfacini
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Germany
| | - Alexander Seidinger
- Institut für Physiologie I, Medizinische FakultätUniversität Bonn, Life&Brain Center Sigmund-Freud-Str. 25 53127 Bonn Germany
| | - Marta Pinto‐Carbó
- Institut für Pflanzen- und MikrobiologieUniversität Zürich Zollikerstr. 107 8008 Zürich Switzerland
| | - René Richarz
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Germany
| | - Tatjana Reuter
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Germany
| | - Stefan Kehraus
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Germany
| | - Asis Hallab
- Pflanzenwissenschaften (IBG-2) Forschungszentrum Jülich Wilhelm-Johnen-Str. 52428 Jülich Germany
| | - Misty Attwood
- Department of Neuroscience, Biomedical CenterUppsala University 751 24 Uppsala Sweden
| | - Helgi B. Schiöth
- Department of Neuroscience, Biomedical CenterUppsala University 751 24 Uppsala Sweden
| | - Peter Mergaert
- Institute for Integrative Biology of the Cell, UMR9198CNRSUniversité Paris‐Sud, CEA Avenue de la Terrasse Gif-sur-Yvette 91198 France
| | - Yoshitomo Kikuchi
- Bioproduction Research Institute AIST Hokkaido Tsukisamu-higashi 2-17-2-1 Sapporo 062-8517 Japan
| | - Till F. Schäberle
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Germany
- Institut für InsektenbiotechnologieUniversität Gießen Heinrich-Buff-Ring 26–32 35392 Gießen Germany
| | - Evi Kostenis
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Germany
| | - Daniela Wenzel
- Institut für Physiologie I, Medizinische FakultätUniversität Bonn, Life&Brain Center Sigmund-Freud-Str. 25 53127 Bonn Germany
| | - Christa E. Müller
- PharmaCenter BonnPharmazeutisches InstitutPharmazeutische Chemie IUniversität Bonn An der Immenburg 4 53121 Bonn Germany
| | - Jörn Piel
- Institut für MikrobiologieEidgenössische Technische Hochschule (ETH) Zürich Vladimir-Prelog Weg 4 8093 Zürich Switzerland
| | - Aurélien Carlier
- Department of Biochemistry and MicrobiologyUniversity of Gent K.L. Ledeganckstraat 35, L9 9000 Gent Belgium
| | - Leo Eberl
- Institut für Pflanzen- und MikrobiologieUniversität Zürich Zollikerstr. 107 8008 Zürich Switzerland
| | - Gabriele M. König
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Germany
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Crüsemann M, Reher R, Schamari I, Brachmann AO, Ohbayashi T, Kuschak M, Malfacini D, Seidinger A, Pinto‐Carbó M, Richarz R, Reuter T, Kehraus S, Hallab A, Attwood M, Schiöth HB, Mergaert P, Kikuchi Y, Schäberle TF, Kostenis E, Wenzel D, Müller CE, Piel J, Carlier A, Eberl L, König GM. Heterologe Expression, Biosynthese und ökologische Funktion des selektiven Gq‐Signaltransduktionsinhibitors FR900359. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707996] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Max Crüsemann
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Deutschland
| | - Raphael Reher
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Deutschland
| | - Isabella Schamari
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Deutschland
| | - Alexander O. Brachmann
- Institut für MikrobiologieEidgenössische Technische Hochschule (ETH) Zürich Vladimir-Prelog-Weg 4 8093 Zürich Schweiz
| | - Tsubasa Ohbayashi
- Institute for Integrative Biology of the Cell, UMR9198CNRSUniversité Paris‐Sud, CEA Avenue de la Terrasse Gif-sur-Yvette 91198 Frankreich
| | - Markus Kuschak
- PharmaCenter BonnPharmazeutisches InstitutPharmazeutische Chemie IUniversität Bonn An der Immenburg 4 53121 Bonn Deutschland
| | - Davide Malfacini
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Deutschland
| | - Alexander Seidinger
- Institut für Physiologie I, Medizinische FakultätUniversität Bonn, Life&Brain Center Sigmund-Freud-Str.25 53127 Bonn Deutschland
| | - Marta Pinto‐Carbó
- Institut für Pflanzen- und MikrobiologieUniversität Zürich Zollikerstrasse 107 8008 Zürich Schweiz
| | - René Richarz
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Deutschland
| | - Tatjana Reuter
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Deutschland
| | - Stefan Kehraus
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Deutschland
| | - Asis Hallab
- Institut für Bio- und GeowissenschaftenPflanzenwissenschaften (IBG-2) Forschungszentrum Jülich Wilhelm-Johnen-Straße 52428 Jülich Deutschland
| | - Misty Attwood
- Department of Neuroscience, Biomedical CenterUppsala University 751 24 Uppsala Schweden
| | - Helgi B. Schiöth
- Department of Neuroscience, Biomedical CenterUppsala University 751 24 Uppsala Schweden
| | - Peter Mergaert
- Institute for Integrative Biology of the Cell, UMR9198CNRSUniversité Paris‐Sud, CEA Avenue de la Terrasse Gif-sur-Yvette 91198 Frankreich
| | - Yoshitomo Kikuchi
- Bioproduction Research Institute AIST Hokkaido Tsukisamu-higashi 2-17-2-1 Sapporo 062-8517 Japan
| | - Till F. Schäberle
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Deutschland
- Institut für InsektenbiotechnologieUniversität Gießen Heinrich-Buff-Ring 26–32 35392 Gießen Deutschland
| | - Evi Kostenis
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Deutschland
| | - Daniela Wenzel
- Institut für Physiologie I, Medizinische FakultätUniversität Bonn, Life&Brain Center Sigmund-Freud-Str.25 53127 Bonn Deutschland
| | - Christa E. Müller
- PharmaCenter BonnPharmazeutisches InstitutPharmazeutische Chemie IUniversität Bonn An der Immenburg 4 53121 Bonn Deutschland
| | - Jörn Piel
- Institut für MikrobiologieEidgenössische Technische Hochschule (ETH) Zürich Vladimir-Prelog-Weg 4 8093 Zürich Schweiz
| | - Aurélien Carlier
- Department of Biochemistry and MicrobiologyUniversity of Gent K.L. Ledeganckstraat 35, L9 9000 Gent Belgien
| | - Leo Eberl
- Institut für Pflanzen- und MikrobiologieUniversität Zürich Zollikerstrasse 107 8008 Zürich Schweiz
| | - Gabriele M. König
- Institut für Pharmazeutische BiologieUniversität Bonn Nussallee 6 53115 Bonn Deutschland
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Vandamme P, Peeters C, De Smet B, Price EP, Sarovich DS, Henry DA, Hird TJ, Zlosnik JEA, Mayo M, Warner J, Baker A, Currie BJ, Carlier A. Comparative Genomics of Burkholderia singularis sp. nov., a Low G+C Content, Free-Living Bacterium That Defies Taxonomic Dissection of the Genus Burkholderia. Front Microbiol 2017; 8:1679. [PMID: 28932212 PMCID: PMC5592201 DOI: 10.3389/fmicb.2017.01679] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [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: 05/31/2017] [Accepted: 08/21/2017] [Indexed: 12/03/2022] Open
Abstract
Four Burkholderia pseudomallei-like isolates of human clinical origin were examined by a polyphasic taxonomic approach that included comparative whole genome analyses. The results demonstrated that these isolates represent a rare and unusual, novel Burkholderia species for which we propose the name B. singularis. The type strain is LMG 28154T (=CCUG 65685T). Its genome sequence has an average mol% G+C content of 64.34%, which is considerably lower than that of other Burkholderia species. The reduced G+C content of strain LMG 28154T was characterized by a genome wide AT bias that was not due to reduced GC-biased gene conversion or reductive genome evolution, but might have been caused by an altered DNA base excision repair pathway. B. singularis can be differentiated from other Burkholderia species by multilocus sequence analysis, MALDI-TOF mass spectrometry and a distinctive biochemical profile that includes the absence of nitrate reduction, a mucoid appearance on Columbia sheep blood agar, and a slowly positive oxidase reaction. Comparisons with publicly available whole genome sequences demonstrated that strain TSV85, an Australian water isolate, also represents the same species and therefore, to date, B. singularis has been recovered from human or environmental samples on three continents.
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Affiliation(s)
- Peter Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent UniversityGhent, Belgium
| | - Charlotte Peeters
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent UniversityGhent, Belgium
| | - Birgit De Smet
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent UniversityGhent, Belgium
| | - Erin P. Price
- Global and Tropical Health Division, Menzies School of Health Research, DarwinNT, Australia
- Centre for Animal Health Innovation, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Sippy DownsQLD, Australia
| | - Derek S. Sarovich
- Global and Tropical Health Division, Menzies School of Health Research, DarwinNT, Australia
- Centre for Animal Health Innovation, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Sippy DownsQLD, Australia
| | - Deborah A. Henry
- Centre for Understanding and Preventing Infection in Children, Department of Pediatrics, University of British Columbia, VancouverBC, Canada
| | - Trevor J. Hird
- Centre for Understanding and Preventing Infection in Children, Department of Pediatrics, University of British Columbia, VancouverBC, Canada
| | - James E. A. Zlosnik
- Centre for Understanding and Preventing Infection in Children, Department of Pediatrics, University of British Columbia, VancouverBC, Canada
| | - Mark Mayo
- Global and Tropical Health Division, Menzies School of Health Research, DarwinNT, Australia
| | - Jeffrey Warner
- College of Public Health, Medical and Veterinary Sciences, Australian Institute of Tropical Health and Medicine, James Cook University, TownsvilleQLD, Australia
| | - Anthony Baker
- Tasmanian Institute of Agriculture, University of Tasmania, HobartTAS, Australia
| | - Bart J. Currie
- Global and Tropical Health Division, Menzies School of Health Research, DarwinNT, Australia
| | - Aurélien Carlier
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent UniversityGhent, Belgium
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Rovetto F, Carlier A, Van den Abeele AM, Illeghems K, Van Nieuwerburgh F, Cocolin L, Houf K. Characterization of the emerging zoonotic pathogen Arcobacter thereius by whole genome sequencing and comparative genomics. PLoS One 2017; 12:e0180493. [PMID: 28671965 PMCID: PMC5495459 DOI: 10.1371/journal.pone.0180493] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 06/17/2017] [Indexed: 11/24/2022] Open
Abstract
Four Arcobacter species have been associated with human disease, and based on current knowledge, these Gram negative bacteria are considered as potential food and waterborne zoonotic pathogens. At present, only the genome of the species Arcobacter butzleri has been analysed, and still little is known about their physiology and genetics. The species Arcobacter thereius has first been isolated from tissue of aborted piglets, duck and pig faeces, and recently from stool of human patients with enteritis. In the present study, the complete genome and analysis of the A. thereius type strain LMG24486T, as well as the comparative genome analysis with 8 other A. thereius strains are presented. Genome analysis revealed metabolic pathways for the utilization of amino acids, which represent the main source of energy, together with the presence of genes encoding for respiration-associated and chemotaxis proteins. Comparative genome analysis with the A. butzleri type strain RM4018 revealed a large correlation, though also unique features. Furthermore, in silico DDH and ANI based analysis of the nine A. thereius strains disclosed clustering into two closely related genotypes. No discriminatory differences in genome content nor phenotypic behaviour were detected, though recently the species Arcobacter porcinus was proposed to encompass part of the formerly identified Arcobacter thereius strains. The report of the presence of virulence associated genes in A. thereius, the presence of antibiotic resistance genes, verified by in vitro susceptibility testing, as well as other pathogenic related relevant features, support the classification of A. thereius as an emerging pathogen.
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Affiliation(s)
- Francesca Rovetto
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke, Belgium
- Department of Forestry, Agriculture and Food Sciences, University of Torino, Largo Braccini 2, Grugliasco, Italy
| | - Aurélien Carlier
- Laboratory of Microbiology, Faculty of Sciences, Ghent University, K. L. Ledeganckstraat 35, Ghent, Belgium
| | | | - Koen Illeghems
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke, Belgium
| | - Filip Van Nieuwerburgh
- Laboratory of Pharmaceutical Biotechnology, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, Ghent, Belgium
| | - Luca Cocolin
- Department of Forestry, Agriculture and Food Sciences, University of Torino, Largo Braccini 2, Grugliasco, Italy
| | - Kurt Houf
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke, Belgium
- * E-mail:
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23
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Peeters C, Cooper VS, Hatcher PJ, Verheyde B, Carlier A, Vandamme P. Comparative genomics of Burkholderia multivorans, a ubiquitous pathogen with a highly conserved genomic structure. PLoS One 2017; 12:e0176191. [PMID: 28430818 PMCID: PMC5400248 DOI: 10.1371/journal.pone.0176191] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 04/06/2017] [Indexed: 12/23/2022] Open
Abstract
The natural environment serves as a reservoir of opportunistic pathogens. A well-established method for studying the epidemiology of such opportunists is multilocus sequence typing, which in many cases has defined strains predisposed to causing infection. Burkholderia multivorans is an important pathogen in people with cystic fibrosis (CF) and its epidemiology suggests that strains are acquired from non-human sources such as the natural environment. This raises the central question of whether the isolation source (CF or environment) or the multilocus sequence type (ST) of B. multivorans better predicts their genomic content and functionality. We identified four pairs of B. multivorans isolates, representing distinct STs and consisting of one CF and one environmental isolate each. All genomes were sequenced using the PacBio SMRT sequencing technology, which resulted in eight high-quality B. multivorans genome assemblies. The present study demonstrated that the genomic structure of the examined B. multivorans STs is highly conserved and that the B. multivorans genomic lineages are defined by their ST. Orthologous protein families were not uniformly distributed among chromosomes, with core orthologs being enriched on the primary chromosome and ST-specific orthologs being enriched on the second and third chromosome. The ST-specific orthologs were enriched in genes involved in defense mechanisms and secondary metabolism, corroborating the strain-specificity of these virulence characteristics. Finally, the same B. multivorans genomic lineages occur in both CF and environmental samples and on different continents, demonstrating their ubiquity and evolutionary persistence.
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Affiliation(s)
| | - Vaughn S. Cooper
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States of America
| | - Philip J. Hatcher
- Department of Computer Science, University of New Hampshire, Durham, NH, United States of America
| | - Bart Verheyde
- Laboratory of Microbiology, Ghent University, Ghent, Belgium
| | | | - Peter Vandamme
- Laboratory of Microbiology, Ghent University, Ghent, Belgium
- * E-mail:
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24
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Sieber S, Carlier A, Neuburger M, Grabenweger G, Eberl L, Gademann K. Isolation and Total Synthesis of Kirkamide, an Aminocyclitol from an Obligate Leaf Nodule Symbiont. Angew Chem Int Ed Engl 2015; 54:7968-70. [DOI: 10.1002/anie.201502696] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Indexed: 01/08/2023]
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Sieber S, Carlier A, Neuburger M, Grabenweger G, Eberl L, Gademann K. Isolation and Total Synthesis of Kirkamide, an Aminocyclitol from an Obligate Leaf Nodule Symbiont. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502696] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Stopnisek N, Zühlke D, Carlier A, Barberán A, Fierer N, Becher D, Riedel K, Eberl L, Weisskopf L. Molecular mechanisms underlying the close association between soil Burkholderia and fungi. ISME J 2015; 10:253-64. [PMID: 25989372 DOI: 10.1038/ismej.2015.73] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 03/24/2015] [Accepted: 03/26/2015] [Indexed: 01/27/2023]
Abstract
Bacterial species belonging to the genus Burkholderia have been repeatedly reported to be associated with fungi but the extent and specificity of these associations in soils remain undetermined. To assess whether associations between Burkholderia and fungi are widespread in soils, we performed a co-occurrence analysis in an intercontinental soil sample collection. This revealed that Burkholderia significantly co-occurred with a wide range of fungi. To analyse the molecular basis of the interaction, we selected two model fungi frequently co-occurring with Burkholderia, Alternaria alternata and Fusarium solani, and analysed the proteome changes caused by cultivation with either fungus in the widespread soil inhabitant B. glathei, whose genome we sequenced. Co-cultivation with both fungi led to very similar changes in the B. glathei proteome. Our results indicate that B. glathei significantly benefits from the interaction, which is exemplified by a lower abundance of several starvation factors that were highly expressed in pure culture. However, co-cultivation also gave rise to stress factors, as indicated by the increased expression of multidrug efflux pumps and proteins involved in oxidative stress response. Our data suggest that the ability of Burkholderia to establish a close association with fungi mainly lies in the capacities to utilize fungal-secreted metabolites and to overcome fungal defense mechanisms. This work indicates that beneficial interactions with fungi might contribute to the survival strategy of Burkholderia species in environments with sub-optimal conditions, including acidic soils.
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Affiliation(s)
- Nejc Stopnisek
- Institute of Plant Biology, University of Zurich, Zürich, Switzerland.,Institute for Sustainability Sciences, Agroscope, Zürich, Switzerland
| | - Daniela Zühlke
- Institute of Microbiology, University of Greifswald, Greifswald, Germany
| | - Aurélien Carlier
- Institute of Plant Biology, University of Zurich, Zürich, Switzerland
| | - Albert Barberán
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - Noah Fierer
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.,Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, USA
| | - Dörte Becher
- Institute of Microbiology, University of Greifswald, Greifswald, Germany
| | - Katharina Riedel
- Institute of Microbiology, University of Greifswald, Greifswald, Germany
| | - Leo Eberl
- Institute of Plant Biology, University of Zurich, Zürich, Switzerland
| | - Laure Weisskopf
- Institute of Plant Biology, University of Zurich, Zürich, Switzerland.,Institute for Sustainability Sciences, Agroscope, Zürich, Switzerland
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Datco A, Duysens C, Massagé P, Carlier A. [Macro replantation of upper extremity. Update and review of the long-term functional results]. Rev Med Liege 2013; 68:122-127. [PMID: 23614320] [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: 06/02/2023]
Abstract
Confronted with increasing problems of financing in health care, some question the relevance of certain interventions of high technicality. Today, the limiting factor for practitioners is not any longer situated at the technical and technological level (the survival of macro replantations is assured in 85-90%) but moves slowly and surely towards the economic level. It is true that medicine has a price and that if a technique is expensive, it should at least be justified at the human level and superior to other less expensive therapeutic options which are available. In this article, we will first focus on the long-term outcome of patients and also on the functional benefit which brings them replantation compared to patients who underwent a regularization of their stump and possibly a reconstruction enabling them to be correctly fitted with a prosthesis.
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Affiliation(s)
- A Datco
- Service de Chirurgie de la Main et des Nerfs Périphériques, CHU de Liège, Belgique
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Chai Y, Carlier A, Bolander J, Roberts S, Geris L, Schrooten J, Van Oosterwyck H, Luyten F. Current views on calcium phosphate osteogenicity and the translation into effective bone regeneration strategies. Acta Biomater 2012; 8:3876-87. [PMID: 22796326 DOI: 10.1016/j.actbio.2012.07.002] [Citation(s) in RCA: 158] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2012] [Revised: 06/28/2012] [Accepted: 07/03/2012] [Indexed: 02/06/2023]
Abstract
Calcium phosphate (CaP) has traditionally been used for the repair of bone defects because of its strong resemblance to the inorganic phase of bone matrix. Nowadays, a variety of natural or synthetic CaP-based biomaterials are produced and have been extensively used for dental and orthopaedic applications. This is justified by their biocompatibility, osteoconductivity and osteoinductivity (i.e. the intrinsic material property that initiates de novo bone formation), which are attributed to the chemical composition, surface topography, macro/microporosity and the dissolution kinetics. However, the exact molecular mechanism of action is unknown. This review paper first summarizes the most important aspects of bone biology in relation to CaP and the mechanisms of bone matrix mineralization. This is followed by the research findings on the effects of calcium (Ca²⁺) and phosphate (PO₄³⁻) ions on the migration, proliferation and differentiation of osteoblasts during in vivo bone formation and in vitro culture conditions. Further, the rationale of using CaP for bone regeneration is explained, focusing thereby specifically on the material's osteoinductive properties. Examples of different material forms and production techniques are given, with the emphasis on the state-of-the art in fine-tuning the physicochemical properties of CaP-based biomaterials for improved bone induction and the use of CaP as a delivery system for bone morphogenetic proteins. The use of computational models to simulate the CaP-driven osteogenesis is introduced as part of a bone tissue engineering strategy in order to facilitate the understanding of cell-material interactions and to gain further insight into the design and optimization of CaP-based bone reparative units. Finally, limitations and possible solutions related to current experimental and computational techniques are discussed.
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Agnoli K, Schwager S, Uehlinger S, Vergunst A, Viteri DF, Nguyen DT, Sokol PA, Carlier A, Eberl L. Exposing the third chromosome of Burkholderia cepacia complex strains as a virulence plasmid. Mol Microbiol 2011; 83:362-78. [PMID: 22171913 DOI: 10.1111/j.1365-2958.2011.07937.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Burkholderia cepacia complex (Bcc) consists of 17 closely related species of opportunistic bacterial pathogens, which are particularly problematic for cystic fibrosis patients and immunocompromised individuals. Bcc genomes consist of multiple replicons, and each strain sequenced to date has three chromosomes. In addition to genes thought to be essential for survival, each chromosome carries at least one rRNA operon. We isolated three mutants during a transposon mutagenesis screen that were non-pathogenic in a Caenorhabditis elegans infection model. It was demonstrated that these mutants had lost chromosome 3 (c3), and that the observed attenuation of virulence was a consequence of this. We constructed a c3 mini-replicon and used it to cure c3 from strains of several Bcc species by plasmid incompatibility, resulting in nine c3-null strains covering seven Bcc species. Phenotypic characterization of c3-null mutants revealed that they were attenuated in virulence in multiple infection hosts (rat, zebrafish, C. elegans, Galleria mellonella and Drosophila melanogaster), that they exhibited greatly diminished antifungal activity, and that c3 was required for d-xylose, fatty acid and pyrimidine utilization, as well as for exopolysaccharide production and proteolytic activity in some strains. In conclusion, we show that c3 is not an essential chromosomal element, rather a large plasmid that encodes virulence, secondary metabolism and other accessory functions in Bcc bacteria.
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Affiliation(s)
- K Agnoli
- Department of Microbiology, Institute of Plant Biology, University of Zürich, Zollikerstrasse 107. CH-8008 Zürich, Switzerland
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Carlier A, Chai YC, Moesen M, Theys T, Schrooten J, Van Oosterwyck H, Geris L. Designing optimal calcium phosphate scaffold-cell combinations using an integrative model-based approach. Acta Biomater 2011; 7:3573-85. [PMID: 21723966 DOI: 10.1016/j.actbio.2011.06.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [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: 01/25/2011] [Revised: 06/07/2011] [Accepted: 06/14/2011] [Indexed: 11/28/2022]
Abstract
Bone formation is a very complex physiological process, involving the participation of many different cell types and regulated by countless biochemical, physical and mechanical factors, including naturally occurring or synthetic biomaterials. For the latter, calcium phosphate (CaP)-based scaffolds have proven to stimulate bone formation, but at present still result in a wide range of in vivo outcomes, which is partly related to the suboptimal use and combination with osteogenic cells. To optimize CaP scaffold selection and make their use in combination with cells more clinically relevant, this study uses an integrative approach in which mathematical modeling is combined with experimental research. This paper describes the development and implementation of an experimentally informed bioregulatory model of the effect of calcium ions released from CaP-based biomaterials on the activity of osteogenic cells and mesenchymal stem cell driven ectopic bone formation. The amount of bone formation predicted by the mathematical model corresponds to the amount measured experimentally under similar conditions. Moreover, the model is also able to qualitatively predict the experimentally observed impaired bone formation under conditions such as insufficient cell seeding and scaffold decalcification. A strategy was designed in silico to overcome the negative influence of a low initial cell density on the bone formation process. Finally, the model was applied to design optimal combinations of calcium-based biomaterials and cell culture conditions with the aim of maximizing the amount of bone formation. This work illustrates the potential of mathematical models as research tools to design more efficient and cell-customized CaP scaffolds for bone tissue engineering applications.
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Affiliation(s)
- A Carlier
- Division of Biomechanics and Engineering Design, KU Leuven, Celestijnenlaan 300 C, Bus 2419, 3001 Heverlee, Belgium
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Ngongo BT, Carlier A, Mols P. [Patient complaints in a hospital emergency department in Belgium]. Rev Med Liege 2011; 66:199-204. [PMID: 21638838] [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: 05/30/2023]
Abstract
Patients express their dissatisfaction through complaints. This study analyzed the frequency and chief complaints of patients presenting to the emergency department (ED). The end point was find ways to improve patient satisfaction after their ED visit. In this retrospective, seven years study, we reviewed 155 chief complaints of patients presenting to the ED of a university hospital. The chief complaints were either from the patients or a family member. One hundred and fifty five chief complaints collected from 496.816 patients presenting to the ED were reviewed over a period of seven years. Complaints case rate was 3.1 per 10.000 visits. Complaints came from patients between the age of 20 to 60 years old (75.0 percent). Complains involved a physician (79.0 percent). The complaints were related a lack of communication (39.0 percent), long waiting time (14.0 percent), wrong diagnosis (22.0 percent), wrong treatment (13.0 percent) and ED disposition of the patient (12.0 percent). Two types of pathology represented more than 15 percent of the complaints: the traumatology (22.0 percent) and the psychiatry (17.0 percent). The traumatology and psychiatry represented respectively 30.0 percent and 10.0 percent of ED visits. Most complaints were addressed and resolved through a hospital mediator, Chief of service or Chief of staff. The rate of complains is low. Most complaints can be prevented if the physician improves communication with patients.
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Bonnet P, Carlier A, Radermecker M, Gillet P, Schoenen J. [The anatomical laboratory: a tool for the trial of the new therapeutic procedures]. Rev Med Liege 2010; 65 Spec no.:35-40. [PMID: 21302519] [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: 05/30/2023]
Abstract
Since September 2009, the new anatomical department is located on the CHU building. This modern anatomical laboratory is an effective tool to design the new therapeutic procedures and to teach these procedures to practitioners.
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Affiliation(s)
- P Bonnet
- Université de Liège, Faculté de Médecine, Belgique.
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Carlier A, Burbank L, von Bodman SB. Identification and characterization of three novel EsaI/EsaR quorum-sensing controlled stewartan exopolysaccharide biosynthetic genes in Pantoea stewartii ssp. stewartii. Mol Microbiol 2009; 74:903-13. [PMID: 19843225 DOI: 10.1111/j.1365-2958.2009.06906.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [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)
- Aurélien Carlier
- Institut für Pflanzenbiologie, Universität Zürich, Zürich, Switzerland
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Nardella D, Sohawon S, Carlier A. Lipofibromatous hamartoma of the median nerve. Three case reports. J Plast Reconstr Aesthet Surg 2009; 62:e314-7. [DOI: 10.1016/j.bjps.2007.11.061] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2007] [Revised: 11/13/2007] [Accepted: 11/16/2007] [Indexed: 11/25/2022]
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35
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Bouzouita N, Kachouri F, Hamdi M, Chaabouni MM, Aissa RB, Zgoulli S, Thonart P, Carlier A, Marlier M, Lognay GC. Volatile Constituents and Antimicrobial Activity ofLavandula stoechasL. Oil from Tunisia. Journal of Essential Oil Research 2005. [DOI: 10.1080/10412905.2005.9699003] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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d'Angelo-Picard C, Faure D, Carlier A, Uroz S, Raffoux A, Fray R, Dessaux Y. Bacterial populations in the rhizosphere of tobacco plants producing the quorum-sensing signals hexanoyl-homoserine lactone and 3-oxo-hexanoyl-homoserine lactone. FEMS Microbiol Ecol 2004; 51:19-29. [PMID: 16329853 DOI: 10.1016/j.femsec.2004.07.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [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: 02/26/2004] [Revised: 06/21/2004] [Accepted: 07/10/2004] [Indexed: 11/15/2022] Open
Abstract
A tobacco line genetically modified to produce two N-acyl homoserine lactones and its non-transformed parental line were grown in non-sterile soil. Microbial populations inhabiting the bulk soil, and those colonizing the root system of the two tobacco lines, were analyzed using cultivation-independent (phospholipid fatty acid and denaturing gradient gel electrophoresis) and cultivation-based assays. The cell density of total cultivable bacteria, fluorescent pseudomonads, sporulated, and thermotolerant bacteria was also determined in a time-course experiment (15 weeks). A possible "rhizosphere effect" related to the development of the plant was seen. However, no dissimilarities in cell population densities or population ratios of the microbial groups were detected in the rhizosphere of the two plant lines. Similarly, bacterial communities that either produced N-acyl homoserine lactone or degraded the signal hexanoyl homoserine lactone were enumerated from the two plant lines. No noticeable differences were evidenced from one plant genotype to the other. Whilst the transgenic plants released detectable amounts of the quorum-sensing signal molecules and efficiently cross-talked with the surrounding microbial populations, the bias generated by these signals in the reported experimental conditions therefore appears to remain weak, if not non-existent.
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Affiliation(s)
- Cathy d'Angelo-Picard
- Institut des Sciences du Végétal, Centre National de la Recherche Scientifique, UPR2355, Bâtiment 23, F-91198, Gif-sur-Yvette, France
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37
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Delalande L, Faure D, Raffoux A, Uroz S, D'Angelo-Picard C, Elasri M, Carlier A, Berruyer R, Petit A, Williams P, Dessaux Y. N-hexanoyl-L-homoserine lactone, a mediator of bacterial quorum-sensing regulation, exhibits plant-dependent stability and may be inactivated by germinating Lotus corniculatus seedlings. FEMS Microbiol Ecol 2004; 52:13-20. [PMID: 16329888 DOI: 10.1016/j.femsec.2004.10.005] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2004] [Revised: 09/30/2004] [Accepted: 10/06/2004] [Indexed: 11/20/2022] Open
Abstract
The half-life of N-hexanoyl-l-homoserine lactone (C6-HSL) was determined under various pH and temperature conditions, and in several plant environments. C6-HSL was sensitive to alkaline pH, a process that was also temperature-dependent. In addition, C6-HSL disappeared from plant environments, i.e. axenic monocot and dicot plants cultivated under gnotobiotic, hydroponic conditions, albeit with variable kinetics. The disappearance was rapid at the root system of legume plants such as clover or Lotus, and slow or non-existent at the root system of monocots such as wheat or corn. These variable kinetics were not dependent upon pH changes that may have affected the growth media of the plants. Furthermore, C6-HSL did not accumulate in the plant, and the plant did not produce inhibitors of the C6-HSL signal. HPLC analyses revealed that C6-HSL disappeared from the media, and hence, Lotus exhibited a natural C6-HSL inactivating ability. This ability was not specific for C6-HSL and allowed the degradation of other N-acyl-homoserine lactones such as 3-oxo-C6-HSL, 3-oxo-octanoyl-HSL and 3-oxo-decanoyl-HSL. Preliminary investigation revealed that the inactivating ability is temperature-dependant and possibly of enzymatic origin.
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Affiliation(s)
- Laurie Delalande
- Institut des Sciences du Végétal, CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette CEDEX, France
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38
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Carlier A, Chevrot R, Dessaux Y, Faure D. The assimilation of gamma-butyrolactone in Agrobacterium tumefaciens C58 interferes with the accumulation of the N-acyl-homoserine lactone signal. Mol Plant Microbe Interact 2004; 17:951-7. [PMID: 15384485 DOI: 10.1094/mpmi.2004.17.9.951] [Citation(s) in RCA: 52] [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] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Agrobacterium tumefaciens C58 communicates using N-acyl-homoserine lactones (acyl-HSL) and contains two lactonase-encoding genes, attM and aiiB, the products of which are capable of inactivating the acyl-HSL signal. In A. tumefaciens A6, the expression of the attKLM operon is controlled by the transcriptional repressor encoded by an adjacent gene, attJ. An attJ::Tn5 mutant does not accumulate acyl-HSL because of the constitutive expression of the lactonase AttM, the activity of which inactivates acyl-HSL. In this work, the attKLM operon of A. tumefaciens C58 was shown to be involved in an assimilative pathway of gamma-butyrolactone (GBL), gamma-hydroxybutyrate (GHB), and succinate semialdehyde (SSA), in which AttM and AttL are key enzymes for GBL and GHB assimilation. The expression of the attKLM promoter was activated in the presence of GBL, GHB, and SSA. Under these conditions, A. tumefaciens C58 did not accumulate the acyl-HSL that it naturally synthesizes, and also became able to inactivate exogenous acyl-HSL signals. Therefore, in A. tumefaciens C58, the assimilative pathway of gamma-butyrolactone interferes with the acyl-HSL signaling.
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Affiliation(s)
- Aurélien Carlier
- Institut des Sciences du Végétal, UPR2355, Centre National de la Recherche Scientifique, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
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Carlier A, Uroz S, Smadja B, Fray R, Latour X, Dessaux Y, Faure D. The Ti plasmid of Agrobacterium tumefaciens harbors an attM-paralogous gene, aiiB, also encoding N-Acyl homoserine lactonase activity. Appl Environ Microbiol 2003; 69:4989-93. [PMID: 12902298 PMCID: PMC169067 DOI: 10.1128/aem.69.8.4989-4993.2003] [Citation(s) in RCA: 131] [Impact Index Per Article: 6.2] [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: 11/20/2022] Open
Abstract
The Agrobacterium tumefaciens C58 genome contains three putative N-acyl homoserine lactone (acyl-HSL) hydrolases, which are closely related to the lactonase AiiA of Bacillus. When expressed in Escherichia coli, two of the putative acyl-HSL hydrolases, AttM and AiiB, conferred the ability to degrade acyl-HSLs on the host. In Erwinia strain 6276, the lactonases reduced the endogenous acyl-HSL level and the bacterial virulence in planta.
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Affiliation(s)
- A Carlier
- Institut des Sciences du Végétal, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
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Uroz S, D'Angelo-Picard C, Carlier A, Elasri M, Sicot C, Petit A, Oger P, Faure D, Dessaux Y. Novel bacteria degrading N-acylhomoserine lactones and their use as quenchers of quorum-sensing-regulated functions of plant-pathogenic bacteria. Microbiology (Reading) 2003; 149:1981-1989. [PMID: 12904538 DOI: 10.1099/mic.0.26375-0] [Citation(s) in RCA: 139] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Bacteria degrading the quorum-sensing (QS) signal molecule N-hexanoylhomoserine lactone were isolated from a tobacco rhizosphere. Twenty-five isolates degrading this homoserine lactone fell into six groups according to their genomic REP-PCR and rrs PCR-RFLP profiles. Representative strains from each group were identified as members of the genera Pseudomonas, Comamonas, Variovorax and Rhodococcus: all these isolates degraded N-acylhomoserine lactones other than the hexanoic acid derivative, albeit with different specificity and kinetics. One of these isolates, Rhodococcus erythropolis strain W2, was used to quench QS-regulated functions of other microbes. In vitro, W2 strongly interfered with violacein production by Chromobacterium violaceum, and transfer of pathogenicity in Agrobacterium tumefaciens. In planta, R. erythropolis W2 markedly reduced the pathogenicity of Pectobacterium carotovorum subsp. carotovorum in potato tubers. These series of results reveal the diversity of the QS-interfering bacteria in the rhizosphere and demonstrate the validity of targeting QS signal molecules to control pathogens with natural bacterial isolates.
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Affiliation(s)
- Stéphane Uroz
- Interactions plantes et micro-organismes de la rhizosphère, Institut des Sciences du Végétal, CNRS, avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Cathy D'Angelo-Picard
- Interactions plantes et micro-organismes de la rhizosphère, Institut des Sciences du Végétal, CNRS, avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Aurélien Carlier
- Interactions plantes et micro-organismes de la rhizosphère, Institut des Sciences du Végétal, CNRS, avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Miena Elasri
- Interactions plantes et micro-organismes de la rhizosphère, Institut des Sciences du Végétal, CNRS, avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Carine Sicot
- Interactions plantes et micro-organismes de la rhizosphère, Institut des Sciences du Végétal, CNRS, avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Annik Petit
- Interactions plantes et micro-organismes de la rhizosphère, Institut des Sciences du Végétal, CNRS, avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Phil Oger
- Laboratoire de Sciences de la Terre, Ecole Normale Supérieure, 43 allée d'Italie, 6364 Lyon Cedex, France
- Interactions plantes et micro-organismes de la rhizosphère, Institut des Sciences du Végétal, CNRS, avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Denis Faure
- Interactions plantes et micro-organismes de la rhizosphère, Institut des Sciences du Végétal, CNRS, avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Yves Dessaux
- Interactions plantes et micro-organismes de la rhizosphère, Institut des Sciences du Végétal, CNRS, avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
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41
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Courtmans I, Born JD, Carlier A, Hans P. [How I treat ... facial paralysis by hypoglosso-facial anastomosis]. Rev Med Liege 2002; 57:3-6. [PMID: 11899495] [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: 02/24/2023]
Abstract
Thirteen patients underwent a hypoglosso- or a spino-facial nerve anastomosis between 1990 and 1996. Facial palsy was the result of surgery in 12 cases and of radiosurgery in 1 case. The mean interval between facial palsy and anastomosis was 12 months. Facial nerve function is determined on the basis of clinical examination according to the classification of House-Brackmann and our own evaluation. According to House, 10 patients are classified grade III and 3 grade IV. Our evaluation defines in 10 grade III, 7 good results and 3 fair results. As far as the good results are concerned, the mean interval between palsy and anastomosis is short (< 3 months). The permanent eating and swallowing dysfunctions are consecutive to multiple cranial nerve deficits. The post-paralysis hemifacial spasm is facilitated by prolongated electric stimulations.
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Affiliation(s)
- I Courtmans
- Service de Neurochirurgie, CHR de la Citadelle
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Denoël C, Collignon L, Dardenne CB, Clanet M, Verhelle N, Heymans O, Carlier A. [Hypothenar hammer syndrome]. Rev Med Liege 2001; 56:830-4. [PMID: 11820035] [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: 02/23/2023]
Abstract
The hypothenar hammer syndrome is an uncommon but underestimated lesion of the cubital artery caused by repetitive trauma at the level of the hamate bone. It characteristically occurs in patients with a history of manual work as metal workers, carpenters and motor mechanics. We present a case of a patient who developed this syndrome following intensive use of a dig. Clinical finding, diagnosis and treatment are discussed.
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Affiliation(s)
- C Denoël
- Service de Chirurgie plastique, Service de Chirurgie de la main et des nerfs périphériques, Université de Liège
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Carlier A, Lejeune G, Khuc T, Pire M, Collin B, Depierreux L, Partoune E, Lejeune A, Clermont D, Minguet R. [Replantation of limbs and limb extremities]. Rev Med Liege 1990; 45:205-18. [PMID: 2192419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- A Carlier
- Université de Liège, CHU Citadelle, Service de Chirurgie
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Abstract
Carpal tunnel syndrome is a condition rarely encountered during the growth period. We describe five new cases in two large Belgian university hospitals. One case concerned a 2-year-old child suffering from disseminated angiomatosis, an association not previously reported. Another case of mild severity corresponded to the classic association of trigger fingers and carpal tunnel syndrome. The third case was posttraumatic, and the last two cases were of the familial type that previously has been reported in four families. We discuss these observations and briefly review the literature.
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Affiliation(s)
- P Poilvache
- Department of Orthopaedic Surgery, Saint-Luc University Hospital, University of Louvain, Brussels, Belgium
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Bonte M, Carlier A. [Rapid determination of bactericidal kinetics by evaluating intracellular adenosine-triphosphate in bioluminescence]. Pathol Biol (Paris) 1989; 37:629-34. [PMID: 2677928] [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: 01/02/2023]
Abstract
Killing kinetics measurement is usually time-consuming and tedious. Bioluminescent adenosine-triphosphate (ATP) assay, after intracellular nucleotide release by bacterial lysis, selects very quickly normal from antibiotic-modified and dead bacteria. Two simultaneous assays are performed with more and less strong lysis reagents (nucleotide releasing bacterial NRB, nucleotide releasing somatic NRS, Lumac). Bioluminescence produced in a luciferine - luciferase system is measured with Biocounter M 2010 luminometer. Differential values of two assays reflect the intracellular ATP fraction of strongest bacteria in tested cultures. Killing curves of some beta lactamines (aminopenicillin and cephalosporins) were studied with active Escherichia coli and Streptococcus pneumoniae cultures. Bactericidal action was seen within few hours, and similar variations of intracellular ATP fraction and numbers of colony-forming units obtained by reference method were observed. This method, well-suited to large series of assays and very rapid (intracellular ATP assay within one minute), performs detailed killing kinetics in real time.
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Affiliation(s)
- M Bonte
- Centre Hospitalier de Roubaix
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46
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Lejeune G, Pire M, Carlier A, Massart B, Lejeune A, Lemaire M. [3 case reports of spinocellular carcinoma of the hand]. Rev Med Liege 1989; 44:353-7. [PMID: 2749079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Khuc T, Carlier A, Pire M, Partoune E, Lejeune G. [Current treatment of fresh lesions of the flexor tendons]. Acta Chir Belg 1989; 89:125-32. [PMID: 2678849] [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: 01/02/2023]
Abstract
Different aspects of primary treatment of flexor tendon lesions are reviewed. Of outstanding importance are: adequate setting and instruments plus meticulous repair with fine material, avoidance of traumatic manipulation of structures and anatomical repair, use of dynamic mobilisation of reconstructed tendons within a team of well informed and motivated therapists.
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Affiliation(s)
- T Khuc
- Service Universitaire de Chirurgie, Hôpital de la Citadelle, Liège
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48
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Carlier A, Khuc T, Pire M, Partoune E, Lejeune G. [Current emergency treatment of lesions of the flexor tendons: anatomical, biomechanical and cicatricial aspects]. Acta Chir Belg 1989; 89:117-24. [PMID: 2800845] [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: 01/02/2023]
Abstract
Emergency treatment of flexor tendon lesion in 1988: anatomic biomechanical and healing characteristics. Flexor tendon surgery in 1988 must take into account detailed anatomic knowledge as well as healing and biomechanical properties of flexor tendons. Application of standardised surgical technics allows reliable treatment when the surgeon is familiar with these technics and the basic knowledge they suppose. The authors detail the technics and certain details with practical goals.
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Affiliation(s)
- A Carlier
- Service Universitaire de Chirurgie, Hôpital de la Citadelle, Liège
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Abstract
Major trauma to the upper extremity may lead to ischemic contracture of various muscle groups, sometimes including the intrinsic muscles of the hand. The clinical consequence of such necrotic fibrosis of the intrinsics is clawing of the digits with marked stiffness. After a short anatomical review of the fascias of the intrinsics, indications and operative techniques are discussed, in parallel with clinical cases. Intrinsic fasciotomy thus appears to be a major step in the prevention of digital clawing, when associated with early physiotherapy.
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Abstract
Coverage of a dorsal defect on the hand of a child with exposed extensor tendons was provided by a denervated first dorsal interosseous muscle and splitthickness skin grafting. We do not recommend routine use of the first dorsal interosseous muscle as a flap; however, its use in cases in which the muscle has been denervated would seem justified.
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