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| Pinaud, Silvain; Portela, Julien; Duval, David; Nowacki, Fanny C.; Olive, Marie-aude; Allienne, Jean-francois; Galinier, Richard; Dheilly, Nolwenn M.; Kieffer-jaquinod, Sylvie; Mitta, Guillaume; Theron, Andre; Gourbal, Benjamin. |
| Discoveries made over the past ten years have provided evidence that invertebrate antiparasitic responses may be primed in a sustainable manner, leading to the failure of a secondary encounter with the same pathogen. This phenomenon called "immune priming" or "innate immune memory" was mainly phenomenological. The demonstration of this process remains to be obtained and the underlying mechanisms remain to be discovered and exhaustively tested with rigorous functional and molecular methods, to eliminate all alternative explanations. In order to achieve this ambitious aim, the present study focuses on the Lophotrochozoan snail, Biomphalaria glabrata, in which innate immune memory was recently reported. We provide herein the first evidence that a shift from a... |
| Tipo: Text |
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| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00315/42664/71872.pdf |
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| Portet, Anais; Pinaud, Silvain; Chaparro, Cristian; Galinier, Richard; Dheilly, Nolwenn M.; Portela, Julien; Charriere, Guillaume; Allienne, Jean-francois; Duval, David; Gourbal, Benjamin. |
| Selective pressures between hosts and their parasites can result in reciprocal evolution or adaptation of specific life history traits. Local adaptation of resident hosts and parasites should lead to increase parasite infectivity/virulence (higher compatibility) when infecting hosts from the same location (in sympatry) than from a foreign location (in allopatry). Analysis of geographic variations in compatibility phenotypes is the most common proxy used to infer local adaptation. However, in some cases, allopatric host-parasite systems demonstrate similar or greater compatibility than in sympatry. In such cases, the potential for local adaptation remains unclear. Here, we study the interaction between Schistosoma and its vector snail Biomphalaria in which... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00488/59982/63214.pdf |
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| Vidal-dupiol, Jeremie; Dheilly, Nolwenn M.; Rondon, Rodolfo; Grunau, Christoph; Cosseau, Celine; Smith, Kristina M.; Freitag, Michael; Adjeroud, Mehdi; Mitta, Guillaume. |
| Global change and its associated temperature increase has directly or indirectly changed the distributions of hosts and pathogens, and has affected host immunity, pathogen virulence and growth rates. This has resulted in increased disease in natural plant and animal populations worldwide, including scleractinian corals. While the effects of temperature increase on immunity and pathogen virulence have been clearly identified, their interaction, synergy and relative weight during pathogenesis remain poorly documented. We investigated these phenomena in the interaction between the coral Pocillopora damicornis and the bacterium Vibrio coralliilyticus, for which the infection process is temperature-dependent. We developed an experimental model that enabled... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00221/33265/31738.pdf |
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| Dheilly, Nolwenn M.; Jouaux, Aude; Boudry, Pierre; Favrel, Pascal; Lelong, Christophe. |
| Background: Triploidy can occur in many animal species but is often lethal. Among invertebrates, amphibians and fishes, triploids are viable although often sterile or infertile. Most triploids of the Pacific oyster Crassostrea gigas are almost sterile (named "3n beta'') yet a low but significant proportion show an advanced gametogenesis (named "3n alpha''). These oysters thus constitute an interesting model to study the effect of triploidy on germ cell development. We used microarrays to compare the gonad transcriptomes of diploid 2n and the abovementioned triploid 3n beta and 3n alpha male and female oysters throughout gametogenesis. Results: All triploids displayed an upregulation of genes related to DNA repair and apoptosis and a downregulation of genes... |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00239/34992/33538.pdf |
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