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<dc:title xml:lang="en">Functional analysis of lipopolysaccharide binding proteins/Bactericidal permeability increasing proteins in immune responses of the freshwater snail, Biomphalaria glabrata</dc:title>
<dcterms:alternative xml:lang="fr">Caractérisation fonctionnelle des LBP/BPls (Lipopolysaccharide binding proteins/Bactericidal permeability increasing proteins) dans la réponse immunitaire de Biomphalaria glabrata</dcterms:alternative>
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<dc:subject xml:lang="en">Biomphalaria glabrata</dc:subject>
<dc:subject xml:lang="en">LBP/BPI</dc:subject>
<dc:subject xml:lang="en">Snail innate immunity</dc:subject>
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<dcterms:abstract xml:lang="fr">Les LBP/BPIs sont des protéines importantes de la réponse antimicrobienne des mammifères, encore mal caractérisées chez les invertébrés. L'objectif de ce projet était d'élucider le rôle des LBP/BPIs dans la réponse immunitaire du gastéropode B. glabrata. Nous avons montré que l'une des LBP/BPI (BgLBP/BPI1) était une protéine majeure de la glande albumène et des masses d'oeufs et possédait les activités attendues des BPIs telle que la capacité de perméabilisation des bactéries.De plus, nous avons découvert une nouvelle activité biocide (anti-oomycète) inconnue jusqu'alors chez les LBP/BPI, et démontré que BgLBP/BPI1 influence à la fois la production d'oeufs et leur protection contre les infections à oomycètes. Nous avons ensuite examiné la diversité et l'évolution des BgLBP/BPIs et montré qu'au moins 5 LBP/BPIs, regroupées en 3 clades phylogénétiques, étaient exprimées chez B. glabrata. Une étude de l'expression de représentants de ces 3 clades a montré qu'ils étaient exprimés dans différents tissus, appuyant l'hypothèse de l'acquisition de spécificités fonctionnelles par les membres de cette famille multigénique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">LBP/BPIs are important immune factors of the mammalian antimicrobial response,poorly characterized in invertebrates. The aim of this work was to elucidate the role of LBP/BPIs in the immune response of the fresh-water snail B. glabrata. Firstly, we showed that one member, BgLBP/BPI1, was highly abundant in the albumen gland and the egg masses. Importantly, in addition to the expected activities of BPIs, such as the induction of bacterial permeability, we discovered a novel biocidal (antioomycete) activity that was unsuspected so far. We demonstrated that BgLBP/BPI1 is a major fitness-related protein, acting on both egg production and offspring protection against oomycete infections. Then, we investigated the sequence diversity and evolution of this LBP/BPI protein family and showed that at least 5 LBP/BPIs were expressed in B. glabrata, belonging to three distinct phylogenetic clades. Expression studies of representatives of the three clades showed that they are expressed in different tissues, differently regulated, and therefore supported the hypothesis of the acquisition of functional specificities by the members of this multigenic family.</dcterms:abstract>
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