Consulta: creatorFacets:"Le Bloa, Simon"
Registros recuperados: 4
Data/hora: 01/06/2024 06:49:19

Mode de reconnaissance hôte symbionte en milieux extrêmes : cas du modèle symbiotique Rimicaris exoculata
Provedor de dados: 5
Autores: Le Bloa, Simon.
Deprived of light, the deep-sea hydrothermal vents are extremes ecosystems sustained by micobial chemosynthesis. These environments are colonized by animal species living in close relationships with these chemoautotrophic micro-organisms, eating them or establishing long term interactions with them, may they be trophic or not only. The shrimp Rimicaris exoculata is an endemic hydrothermal species of the Mid-Atlantic Ridge (MAR) sites. This crustacean represents the predominant macrofauna of some sites of the MAR. It lives in symbiotic association with two distinct microbial communities qualified as ectosymbiosis. One is located in its gill chamber and one in its gut. First, this work focused on the study of bacterial communication (Quorum Sensing or QS)...
Tipo: Text
Palavras-chave: Écosystèmes hydrothermaux; Peptide antimicrobien; Marqueurs génétiques; Hydrothermal vent; Rimicaris exoculata; Symbiose; Quorum Sensing; Antimicrobial peptide; Genetic marker.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00498/60918/64279.pdf

Highlighting of quorum sensing lux genes and their expression in the hydrothermal vent shrimp Rimicaris exoculata ectosymbiontic community. Possible use as biogeographic markers
Provedor de dados: 5
Autores: Le Bloa, Simon; Durand, Lucile; Cueff-gauchard, Valerie; Le Bars, Josiane; Taupin, Laure; Marteau, Charlotte; Bazire, Alexis; Cambon-bonavita, Marie-anne.
Rimicaris exoculata is a caridean shrimp that dominates the fauna at several hydrothermal vent sites of the Mid-Atlantic Ridge. It has two distinct and stable microbial communities. One of these epibiontic bacterial communities is located in the shrimp gut and has a distribution and role that are poorly understood. The second colonizes its enlarged gill chamber and is involved in host nutrition. It is eliminated after each molt, and has colonization processes reminiscent of those of a biofilm. The presence and expression of genes usually involved in quorum sensing (QS) were then studied. At four sites, Rainbow, TAG, Snake Pit and Logatchev, two lux genes were identified in the R. exoculata epibiontic community at different shrimp molt stages and life...
Tipo: Text
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00377/48841/49268.pdf

Development of an ecotoxicological protocol for the deep-sea fauna using the hydrothermal vent shrimp Rimicaris exoculata
Provedor de dados: 5
Autores: Auguste, M.; Mestre, N. C.; Rocha, T. L.; Cardoso, C.; Cueff-gauchard, Valerie; Le Bloa, Simon; Cambon-bonavita, Marie-anne; Shillito, B.; Zbinden, M.; Ravaux, J.; Bebianno, M. J.
In light of deep-sea mining industry development, particularly interested in massive-sulphide deposits enriched in metals with high commercial value, efforts are increasing to better understand potential environmental impacts to local fauna. The aim of this study was to assess the natural background levels of biomarkers in the hydrothermal vent shrimp Rimicaris exoculata and their responses to copper exposure at in situ pressure (30 MPa) as well as the effects of depressurization and pressurization of the high-pressure aquarium IPOCAMP. R. exoculata were collected from the chimney walls of the hydrothermal vent site TAG (Mid Atlantic Ridge) at 3630 m depth during the BICOSE cruise in 2014. Tissue metal accumulation was quantified in different tissues...
Tipo: Text
Palavras-chave: Deep-sea mining; Hydrothermal vents; Biomarkers; Ipocamp; Copper; TAG.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00323/43465/42869.pdf

Antimicrobial Peptides and Ectosymbiotic Relationships: Involvement of a Novel Type IIa Crustin in the Life Cycle of a Deep-Sea Vent Shrimp
Provedor de dados: 5
Autores: Le Bloa, Simon; Boidin-wichlacz, Céline; Cueff-gauchard, Valerie; Rosa, Rafael Diego; Cuvillier-hot, Virginie; Durand, Lucile; Methou, Pierre; Pradillon, Florence; Cambon-bonavita, Marie-anne; Tasiemski, Aurélie.
The symbiotic shrimp Rimicaris exoculata dominates the macrofauna inhabiting the active smokers of the deep-sea mid Atlantic ridge vent fields. We investigated the nature of the host mechanisms controlling the vital and highly specialized ectosymbiotic community confined into its cephalothoracic cavity. R. exoculata belongs to the Pleocyemata, crustacean brooding eggs, usually producing Type I crustins. Unexpectedly, a novel anti-Gram-positive type II crustin was molecularly identified in R. exoculata. Re-crustin is mainly produced by the appendages and the inner surfaces of the cephalothoracic cavity, embedding target epibionts. Symbiosis acquisition and regulating mechanisms are still poorly understood. Yet, symbiotic communities were identified at...
Tipo: Text
Palavras-chave: Extreme; Hydrothermal; Symbiosis; Host-microbe interaction; Invertebrate immunity; Crustacean.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00643/75534/76413.pdf