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| Registros recuperados: 10 | |
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| Tetreau, Guillaume; Dhinaut, Julien; Galinier, Richard; Audant-lacour, Pascaline; Voisin, Sébastien N; Arafah, Karim; Chogne, Manon; Hilliou, Frédérique; Bordes, Anaïs; Sabarly, Camille; Chan, Philippe; Walet-balieu, Marie-laure; Vaudry, David; Duval, David; Bulet, Philippe; Coustau, Christine; Moret, Yannick; Gourbal, Benjamin. |
| In a number of species, individuals exposed to pathogens can mount an immune response and transmit this immunological experience to their offspring, thereby protecting them against persistent threats. Such vertical transfer of immunity, named trans-generational immune priming (TGIP), has been described in both vertebrates and invertebrates. Although increasingly studied during the last decade, the mechanisms underlying TGIP in invertebrates are still elusive, especially those protecting the earliest offspring life stage, i.e. the embryo developing in the egg. In the present study, we combined different proteomic and transcriptomic approaches to determine whether mothers transfer a “signal” (such as fragments of infecting bacteria), mRNA and/or... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00655/76684/77815.pdf |
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| Wang, Ran; Tetreau, Guillaume; Wang, Ping. |
| Fitness costs associated with resistance to Bacillus thuringiensis (Bt) toxins critically impact the development of resistance in insect populations. In this study, the fitness costs in Trichoplusia ni strains associated with two genetically independent resistance mechanisms to Bt toxins Cry1Ac and Cry2Ab, individually and in combination, on four crop plants (cabbage, cotton, tobacco and tomato) were analyzed, in comparison with their near-isogenic susceptible strain. The net reproductive rate (R-0) and intrinsic rate of increase (r) of the T. ni strains, regardless of their resistance traits, were strongly affected by the host plants. The ABCC2 gene-linked mechanism of Cry1Ac resistance was associated with relatively low fitness costs, while the Cry2Ab... |
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| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00317/42841/79517.pdf |
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| Lassalle, Damien; Tetreau, Guillaume; Pinaud, Silvain; Galinier, Richard; Crickmore, Neil; Gourbal, Benjamain; Duval, David. |
| Biomphalaria glabrata is a freshwater Planorbidae snail. In its environment, this mollusk faces numerous microorganisms or pathogens, and has developed sophisticated innate immune mechanisms to survive. The mechanisms of recognition are quite well understood in Biomphalaria glabrata, but immune effectors have been seldom described. In this study, we analyzed a new family of potential immune effectors and characterized five new genes that were named Glabralysins. The five Glabralysin genes showed different genomic structures and the high degree of amino acid identity between the Glabralysins, and the presence of the conserved ETX/MTX2 domain, support the hypothesis that they are pore-forming toxins. In addition, tertiary structure prediction confirms that... |
| Tipo: Text |
Palavras-chave: Pore-forming toxin; Cry toxin; Invertebrate; Biomphalaria glabrata; Host; Pathogen; Vector snail; Innate immunity. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00601/71267/69655.pdf |
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| Wang, Ran; Li, Fengqi; Zhang, Wei; Zhang, Xiaoman; Qu, Cheng; Tetreau, Guillaume; Sun, Lujuan; Luo, Chen; Zhou, Jingjiang. |
| Odorant binding proteins (OBPs) and chemosensory proteins (CSPs) of arthropods are thought to be involved in chemical recognition which regulates pivotal behaviors including host choice, copulation and reproduction. In insects, OBPs and CSPs located mainly in the antenna but they have not been systematically characterized yet in Bemisia tabaci which is a cryptic species complex and could damage more than 600 plant species. In this study, among the 106,893 transcripts in the head assembly, 8 OBPs and 13 CSPs were identified in B. tabaci MED based on head transcriptomes of adults. Phylogenetic analyses were conducted to investigate the relationships of B. tabaci OBPs and CSPs with those from several other important Hemipteran species, and the motif-patterns... |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00663/77537/79351.pdf |
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| Tetreau, Guillaume. |
| Toxins are a major virulence factor produced by many pathogenic bacteria. In vertebrates, the response of hosts to the bacteria is inseparable from the response to the toxins, allowing a comprehensive understanding of this tripartite host-pathogen-toxin interaction. However, in invertebrates, this interaction has been investigated by two complementary but historically distinct fields of research: toxinology and immunology. In this article, I highlight how such dichotomy between these two fields led to a biased, or even erroneous view of the ecology and evolution of the interaction between insects, toxins, and bacteria. I focus on the reason behind such a dichotomy, on how to bridge the fields together, and on confounding effects that could bias the outcome... |
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Palavras-chave: Invertebrate immunity; Host-pathogens interaction; Toxins; Bacillus thuringiensis; Resistance. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00457/56834/78950.pdf |
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| Pinaud, Silvain; Tetreau, Guillaume; Poteaux, Pierre; Galinier, Richard; Chaparro, Cristian; Lassalle, Damien; Portet, Anaïs; Simphor, Elodie; Gourbal, Benjamin; Duval, David. |
| Aerolysins initially characterized as virulence factors in bacteria are increasingly found in massive genome and transcriptome sequencing data from metazoans. Horizontal gene transfer has been demonstrated as the main way of aerolysin-related toxins acquisition in metazoans. However, only few studies have focused on their potential biological functions in such organisms. Herein, we present an extensive characterization of a multigene family encoding aerolysins - named biomphalysin - in Biomphalaria glabrata snail, the intermediate host of the trematode Schistosoma mansoni. Our results highlight that duplication and domestication of an acquired bacterial toxin gene in the snail genome result in the acquisition of a novel and diversified toxin family.... |
| Tipo: Text |
Palavras-chave: Biomphalaria; Biomphalysin; Aerolysin; Invertebrate immunity; Pore-forming toxin (PFT); Structure. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00687/79909/82814.pdf |
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| Registros recuperados: 10 | |
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