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Registros recuperados: 7
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Interspecific competition between entomopathogenic nematodes (Steinernema) is modified by their bacterial symbionts (Xenorhabdus) Inra
Sicard, M.; Hinsinger, J.; Le Brun, N.; Pages, S.; Boemare, N.; Moulia, C..
Background: Symbioses between invertebrates and prokaryotes are biological systems of particular interest in order to study the evolution of mutualism. The symbioses between the entomopathogenic nematodes Steinernema and their bacterial symbiont Xenorhabdus are very tractable model systems. Previous studies demonstrated (i) a highly specialized relationship between each strain of nematodes and its naturally associated bacterial strain and (ii) that mutualism plays a role in several important life history traits of each partner such as access to insect host resources, dispersal and protection against various biotic and abiotic factors. The goal of the present study was to address the question of the impact of Xenorhabdus symbionts on the progression and...
Tipo: Journal Article Palavras-chave: XENORHABDUS; STEINERNEMA; ENTOMOPATHOGENIC NEMATODE; HOST-SYMBIONT SPECIFICITY; MOLECULAR PHYLOGENY; SYMBIOSIS; DESCRIPTION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200877ef46a8&uri=/notices/prodinra1/2010/10/
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Isolation and identification of entomopathogenic nematodes and their symbiotic bacteria from Herault and Gard (Southern France) Inra
Emelianoff, V.; Le Brun, N.; Pages, S.; Stock, P.; Tailliez, P.; Moulia, C.; Sicard, M..
Isolation and identification of native nematode-bacterial associations in the field are necessary for successful control of endemic pests in a particular location. No study has yet been undertaken to recover and identify EPN in metropolitan France. In the present paper, we provide results of a survey of EPN and their symbiotic bacteria conducted in Herault and Gard regions in Southern France. Molecular characterization of isolated nematodes depicted three different Steinernema species and one Heterorhabditis species, H. bacteriophora. Steinernema species recovered were identified as: S. feltiae and S. affine and an undescribed species. Xenorhabdus symbionts were identified as X. bovienii for both S. feltiae and S. affine. Phylogenetic analysis placed the...
Tipo: Journal Article Palavras-chave: ENTOMOPATHOGENIC NEMATODE; STEINERNEMA; HETEROHABDITIS; PHOTORHABDUS; XENORHABDUS; HOST-SYMBIONT SPECIFICITY; MOLECULAR PHYLOGENY; SYMBIOSIS.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20085b9dadd7&uri=/notices/prodinra1/2009/03/
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Optical mapping as a routine tool for bacterial genome sequence finishing Inra
Latreille, P.; Norton, S.; Goldman, B.S.; Henkhaus, J.; Miller, N.; Barbazuk, B.; Bode, H.B.; Darby, C.; Du, Z.; Forst, S.; Gaudriault, S.; Goodner, B.; Goodrich-Blair, H.; Slater, S..
Background: In sequencing the genomes of two Xenorhabdus species, we encountered a large number of sequence repeats and assembly anomalies that stalled finishing efforts. This included a stretch of about 12 Kb that is over 99.9% identical between the plasmid and chromosome of X. nematophila.Results: Whole genome restriction maps of the sequenced strains were produced through optical mapping technology. These maps allowed rapid resolution of sequence assembly problems, permitted closing of the genome, and allowed correction of a large inversion in a genome assembly that we had considered finished.Conclusion: Our experience suggests that routine use of optical mapping in bacterial genome sequence finishing is warranted. When combined with data produced...
Tipo: Journal Article Palavras-chave: XENORHABDUS ; STEINERNEMA; SYMBIOTIC BACTERIA; OPTICAL MAPPING; ENTOMOPATHOGENIC NEMATODE; PHOTORHABDUS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010e8e83aa6&uri=/notices/prodinra1/2010/10/
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Site-specific antiphagocytic function of the Photorhabdus luminescens type III secretion system during insect colonization Inra
Brugirard-Ricaud, K.; Duchaud, E.; Givaudan, A.; Girard, P.A.; Kunst, F.; Boemare, N.; Brehélin, M.; Zumbihl, R..
Photorhabdus is an entomopathogenic bacterium belonging to the Enterobacteriaceae. The genome of the TT01 strain of Photorhabdus luminescens was recently sequenced and a large number of toxin-encoding genes were found. Genomic analysis predicted the presence on the chromosome of genes encoding a type three secretion system (TTSS), the main role of which is the delivery of effector proteins directly into eukaryotic host cells. We report here the functional characterization of the TTSS. The locus identified encodes the secretion/translocation apparatus, gene expression regulators and an effector protein - LopT - homologous to the Yersinia cysteine protease cytotoxin YopT. Heterologous expression in Yersinia demonstrated that LopT was translocated into mammal...
Tipo: Journal Article Palavras-chave: ENTOMOPATHOGENIC BACTERIUM; GENE EXPRESSION; ENTOMOPATHOGENIC NEMATODE; INSECT CELL MEMBRANE.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008e8fb85eb&uri=/notices/prodinra1/2009/03/
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Stages of infection during the tripartite interaction between Xenorhabdus nematophila, its nematode vector, and insect hosts Inra
Sicard, M.; Brugirard-Ricaud, K.; Pages, S.; Lanois, A.; Boemare, N.; Brehélin, M.; Givaudan, A..
Bacteria of the genus Xenorhabdus are mutually associated with entomopathogenic nematodes of the genus Steinernema and are pathogenic to a broad spectrum of insects. The nematodes act as vectors, transmitting the bacteria to insect larvae, which die within a few days of infection. We characterized the early stages of bacterial infection in the insects by constructing a constitutive green fluorescent protein (GFP)-labeled Xenorhabdus nematophila strain. We injected the GFP-labeled bacteria into insects and monitored infection. We found that the bacteria had an extracellular life cycle in the hemolymph and rapidly colonized the anterior midgut region in Spodoptera littoralis larvae. Electron microscopy showed that the bacteria occupied the extracellular...
Tipo: Journal Article Palavras-chave: XENORHABDUS; ENTOMOPATHOGENIC NEMATODE; STEINERNEMA; GFP-LABELED; INTESTINAL VESICLE; SPODOPTERA.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008345034c5&uri=/notices/prodinra1/2009/03/
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Steinernema sichuanense n. sp (Rhabditida, Steinernematidae), a new species of entomopathogenic nematode from the province of Sichuan, east Tibetan Mts., China Inra
Mracek, Z.; Nguyen, K.B.; Tailliez, P.; Boemare, N.; Chen, S..
Steinernema sichuanense n. sp. is characterized by male, female and IJ. For male, the spicules are robust with prominent rostrum; gubernaculum has blunt anterior end; cuneus is arrow-shaped, pointed posteriorly. Second-generation male has a prominent mucron. For female, tail usually has one to four papillae-like projections on tail tip; post anal swelling is absent. For U, body length is about 7 10 gm; lateral field has six ridges; the formula of lateral field is 2, 5, 6, 4, 2 with two prominent submarginal ridges; tail usually has a dorsal depression. In Steinernema affine/intermedium group, the U of S. sichuanense n. sp. differs from S. affine by its absence of the internal tail spine; differs from Steinernema beddingi by its six ridges in lateral field...
Tipo: Journal Article Palavras-chave: DESCRIPTION; ENTOMOPATHOGENIC NEMATODE; INSECT PARASITE; MOLECULAR; NEW SPECIES; PHYLOGENETIC SYSTEMATIC; STEINERNEMA; XENORHABDUS; TAXONOMY.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008a03b64c&uri=/notices/prodinra1/2009/03/
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The PhoP-PhoQ two-component regulatory system of Photorhabdus luminescens is essential for virulence in insects Inra
Derzelle, S.; Turlin, E.; Duchaud, E.; Pages, S.; Kunst, F.; Givaudan, A.; Danchin, A..
Photorhabdus luminescens is a symbiont of entomopathogenic nematodes. Analysis of the genome sequence of this organism revealed a homologue of PhoP-PhoQ, a two-component system associated with virulence in intracellular bacterial pathogens. This organism was shown to respond to the availability of environmental magnesium. A mutant with a knockout mutation in the regulatory component of this system (phoP) had no obvious growth defect. It was, however, more motile and more sensitive to antimicrobial peptides than its wild-type parent. Remarkably, the mutation eliminated virulence in an insect model. No insect mortality was observed after injection of a large number of the phoP bacteria, while very small amounts of parental cells killed insect larvae in less...
Tipo: Journal Article Palavras-chave: ENTOMOPATHOGENIC NEMATODE; GENOME SEQUENCE; BACTERIAL PATHOGENE; VIRULENCE; INSECT MODEL; MAGNESIUM.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008acbe701f&uri=/notices/prodinra1/2009/03/
Registros recuperados: 7
Primeira ... 1 ... Última
 

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