Consulta: subjectFacets:"Holobiont"
Registros recuperados: 9
Data/hora: 10/06/2024 03:50:42

Holobionts and their hologenomes: Evolution with mixed modes of inheritance
Provedor de dados: Genetics and Molecular Biology
Autores: Haag,Karen Luisa.
Abstract Symbioses are ubiquitous and have played an influential role in the evolution of life on Earth. Genomic studies are now revealing a huge diversity of associations among hosts and their microbiotas, allowing us to characterize their complex ecological and evolutionary dynamics. The different transmission modes and the asynchronous cell proliferation of the numerous symbionts associated with one host generate a genomic conflict ought to be solved. Two disputing views have been used to model and predict the outcome of such conflicts. The traditional view is based on community ecology, and considers that selection at the level of individuals is sufficient to explain longstanding associations among species. A new perspective considers that the host and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genomics; Metagenomics; Microbiota; Symbiosis; Holobiont.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000200189

Microbiota Composition and Evenness Predict Survival Rate of Oysters Confronted to Pacific Oyster Mortality Syndrome
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Clerissi, Camille; De Lorgeril, Julien; Petton, Bruno; Lucasson, Aude; Escoubas, Jean Michel; Gueguen, Yannick; Dégremont, Lionel; Mitta, Guillaume; Toulza, Eve.
Pacific Oyster Mortality Syndrome (POMS) affects Crassostrea gigas oysters worldwide and causes important economic losses. Disease dynamic was recently deciphered and revealed a multiple and progressive infection caused by the Ostreid herpesvirus OsHV-1 μVar, triggering an immunosuppression followed by microbiota destabilization and bacteraemia by opportunistic bacterial pathogens. However, it remains unknown if microbiota might participate to protect oysters against POMS, and if microbiota characteristics might be predictive of oyster mortalities. To tackle this issue, we transferred full-sib progenies of resistant and susceptible oyster families from hatchery to the field during a period in favor of POMS. After 5 days of transplantation, oysters from...
Tipo: Text
Palavras-chave: Holobiont; Microbiome; Metabarcoding; Fitness; Bacteria.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00621/73332/72500.pdf

Entangled fates of holobiont genomes during invasion: nested bacterial and host diversities in     Caulerpa taxifolia
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Arnaud-haond, Sophie; Aires, Tania; Candeias, R.; Teixeira, S. J. L.; Duarte, C. M.; Valero, M.; Serrao, E. A.
Successful prevention and mitigation of biological invasions requires retracing the initial steps of introduction, as well as understanding key elements enhancing the adaptability of invasive species. We studied the genetic diversity of the green alga Caulerpa taxifolia and its associated bacterial communities in several areas around the world. The striking congruence of α and ß diversity of the algal genome and endophytic communities reveals a tight association, supporting the holobiont concept as best describing the unit of spreading and invasion. Both genomic compartments support the hypotheses of a unique accidental introduction in the Mediterranean and of multiple invasion events in Southern Australia. In addition to helping with tracing the origin of...
Tipo: Text
Palavras-chave: Caulerpa; Clonal diversity; Endophytic communities; Holobiont; Invasion paradox; Marine invasion.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00369/48058/48145.pdf

Protists Within Corals: The Hidden Diversity
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Clerissi, Camille; Brunet, Sebastien; Vidal-dupiol, Jeremie; Adjeroud, Mehdi; Lepage, Pierre; Guillou, Laure; Escoubas, Jean Michel; Toulza, Eve.
Previous observations suggested that microbial communities contribute to coral health and the ecological resilience of coral reefs. However, most studies of coral microbiology focused on prokaryotes and the endosymbiotic algae Symbiodinium. In contrast, knowledge concerning diversity of other protists is still lacking, possibly due to methodological constraints. As most eukaryotic DNA in coral samples was derived from hosts, protist diversity was missed in metagenome analyses. To tackle this issue, we designed blocking primers for Scleractinia sequences amplified with two primer sets that targeted variable loops of the 18S rRNA gene (18SV1V2 and 18SV4). These blocking primers were used on environmental colonies of Pocillopora damicornis sensu lato from two...
Tipo: Text
Palavras-chave: Holobiont; Protists; Symbiosis; Metabarcoding; Blocking primer; Scleractinia; Pocillopora damicornis.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00457/56823/58661.pdf

Rimicaris exoculata: biology and ecology of a shrimp from deep-sea hydrothermal vents associated with ectosymbiotic bacteria
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Zbinden, M; Cambon-bonavita, Marie-anne.
Rimicaris exoculata, the ‘blind shrimp,’ is the most abundant species living on active hydrothermal edifices at deep-sea vents of the Mid-Atlantic Ridge. Its unusually enlarged branchial chamber houses a dense ectosymbiotic community of chemoautotrophic bacteria. Long debated, shrimp nutrition has been proven to be a kind of osmotrophy, whereby small organic molecules produced by the symbionts pass through the integument of the shrimp directly into the circulatory system, rather than through the digestive system. The broad phylogenetic and metabolic diversity of this epibiotic community suggests a highly flexible and adjustable microbial consortium, adapted to the chemically contrasting environments inhabited by the shrimp. To cope with the highly...
Tipo: Text
Palavras-chave: Alvinocaridid shrimp; Chemoautotrophic symbiont; Deep-sea; Epibiosis; Holobiont; Hydrothermal vents; Mid-Atlantic Ridge; Rimicaris exoculata.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00655/76681/77812.pdf

Viral and Bacterial Epibionts in Thermally-Stressed Corals
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Nguyen-kim, Hanh; Bouvier, Thierry; Bouvier, Corinne; Ngoc Bui, Van; Le-lan, Huong; Bettarel, Yvan.
The periodic rise in seawater temperature is one of the main environmental determinants of coral bleaching. However, the direct incidence of these episodic thermal anomalies on coral-associated microbiota and their subsequent effects on coral health are still not completely understood. In this study, we investigated the dynamics of three main microbial communities of the coral holobiont (e.g., Symbiodinium, bacteria and viruses), during an experimental thermal stress (+4 degrees C) conducted on the scleractinian Fungia repanda. The heat-treatment induced coral bleaching after 11 days and resulted in a final elevation of ca. 9, 130 and 250-fold in the abundance of mucosal viruses, bacteria, and Symbiodinium, respectively. On the contrary, the proportion of...
Tipo: Text
Palavras-chave: Coral bleaching; Thermal stress; Bacteria; Viruses; Holobiont; Vietnam.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00626/73823/73642.pdf

Seasonal and algal diet-driven patterns of the digestive microbiota of the European abalone Haliotis tuberculata, a generalist marine herbivore
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gobet, Angelique; Mest, Laetitia; Perennou, Morgan; Dittami, Simon M.; Caralp, Claire; Coulombet, Celine; Huchette, Sylvain; Roussel, Sabine; Michel, Gurvan; Leblanc, Catherine.
Background: Holobionts have a digestive microbiota with catabolic abilities allowing the degradation of complex dietary compounds for the host. In terrestrial herbivores, the digestive microbiota is known to degrade complex polysaccharides from land plants while in marine herbivores, the digestive microbiota is poorly characterized. Most of the latter are generalists and consume red, green, and brown macroalgae, three distinct lineages characterized by a specific composition in complex polysaccharides, which represent half of their biomass. Subsequently, each macroalga features a specific epiphytic microbiota, and the digestive microbiota of marine herbivores is expected to vary with a monospecific algal diet. We investigated the effect of four...
Tipo: Text
Palavras-chave: Microbe-host interactions; Digestive microbiota; Abalone; Macroalgae; Holobiont.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00489/60071/63368.pdf

Unveiling protist diversity associated with the Pacific oyster Crassostrea gigas using blocking and excluding primers
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Clerissi, Camille; Guillou, Laure; Escoubas, Jean Michel; Toulza, Eve.
Background Microbiome of macroorganisms might directly or indirectly influence host development and homeostasis. Many studies focused on the diversity and distribution of prokaryotes within these assemblages, but the eukaryotic microbial compartment remains underexplored so far. Results To tackle this issue, we compared blocking and excluding primers to analyze microeukaryotic communities associated with Crassostrea gigas oysters. High-throughput sequencing of 18S rRNA genes variable loops revealed that excluding primers performed better by not amplifying oyster DNA, whereas the blocking primer did not totally prevent host contaminations. However, blocking and excluding primers showed similar pattern of alpha and beta diversities when protist communities...
Tipo: Text
Palavras-chave: Holobiont; Metabarcoding; Microbiome; Ostreoida; Crassostrea.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00636/74799/75165.pdf

Niche partitioning in the Rimicaris exoculata holobiont: the case of the first symbiotic Zetaproteobacteria
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cambon-bonavita, Marie-anne; Aubé, Johanne; Cueff-gauchard, Valerie; Reveillaud, Julie.
Background Free-living and symbiotic chemosynthetic microbial communities support primary production and higher trophic levels in deep-sea hydrothermal vents. The shrimp Rimicaris exoculata, which dominates animal communities along the Mid-Atlantic Ridge, houses a complex bacterial community in its enlarged cephalothorax. The dominant bacteria present are from the taxonomic groups Campylobacteria, Desulfobulbia (formerly Deltaproteobacteria), Alphaproteobacteria, Gammaproteobacteria, and some recently discovered iron oxyhydroxide-coated Zetaproteobacteria. This epibiotic consortium uses iron, sulfide, methane, and hydrogen as energy sources. Here, we generated shotgun metagenomes from Rimicaris exoculata cephalothoracic epibiotic communities to reconstruct...
Tipo: Text
Palavras-chave: Niche partitioning; Rimicaris; Metagenome-assembled genomes; Zetaproteobacteria; Holobiont; Hydrothermal vents.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00689/80089/83128.pdf