Transmission studies and the composition of prokaryotic communities associated with healthy and diseased<i>Aplysina cauliformis</i>sponges suggest that<i>Aplysina</i>Red Band Syndrome is a prokaryotic polymicrobial disease

Monti, Matteo; Giorgi, Aurora; Easson, Cole G.; Gochfeld, Deborah J.; Olson, Julie B.

doi:10.1093/femsec/fiab164

Cited by 2 publications

(1 citation statement)

References 130 publications

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“…Chaib De Mares et al ( 2018 ) previously showed that close relatives of Pseudohongiella were among the most metabolically active bacterial associates of A. aerophoba . Monti et al ( 2021 ), furthermore, observed them to be enriched in diseased tissue of A. cauliformis . Moreover, and in accordance with their specific proliferation in heat-treated microcosms, Pseudohongiella strains isolated from seawater grew optimally at a temperature of 30°C (Xu et al 2016 ).…”

Section: Discussionmentioning

confidence: 98%

Impacts of humic substances, elevated temperature, and UVB radiation on bacterial communities of the marine sponge Chondrilla sp

Stuij,

Cleary,

Rocha

et al. 2024

FEMS Microbiology Ecology

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Sponges are abundant components of coral reefs known for their filtration capabilities and intricate interactions with microbes. They play a crucial role in maintaining the ecological balance of coral reefs. Humic substances (HS) affect bacterial communities across terrestrial, freshwater, and marine ecosystems. However, the specific effects of HS on sponge-associated microbial symbionts have largely been neglected. Here, we used a randomized-controlled microcosm setup to investigate the independent and interactive effects of HS, elevated temperature, and UVB radiation on bacterial communities associated with the sponge Chondrilla sp. Our results indicated the presence of a core bacterial community consisting of relatively abundant members, apparently resilient to the tested environmental perturbations, alongside a variable bacterial community. Elevated temperature positively affected the relative abundances of ASVs related to Planctomycetales and members of the families Pseudohongiellaceae and Hyphomonadaceae. HS increased the relative abundances of several ASVspotentially involved in recalcitrant organic matter degradation (e.g. the BD2-11 terrestrial group, Saccharimonadales, and SAR202 clade). There was no significant independent effect of UVB and no significant interactive effects of HS, Heat and UVB on bacterial diversity and composition. The significant, independent impact of HS on the composition of sponge bacterial communities suggests that alterations to HS inputs may have cascading effects on adjacent marine ecosystems.

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Section: Discussionmentioning

confidence: 98%

Impacts of humic substances, elevated temperature, and UVB radiation on bacterial communities of the marine sponge Chondrilla sp

Stuij,

Cleary,

Rocha

et al. 2024

FEMS Microbiology Ecology

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Mitigation of Vibrio coralliilyticus -induced coral bleaching through bacterial dysbiosis prevention by Ruegeria profundi

Xu,

Cai,

Cheng

et al. 2024

Appl Environ Microbiol

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Vibrio species are prevalent in ocean ecosystems, particularly Vibrio coralliilyticus , and pose a threat to corals and other marine organisms under global warming conditions. While microbiota manipulation is considered for coral disease management, understanding the role of commensal bacteria in stress resilience remains limited. Here, a single bacterial species ( Ruegeria profundi ) rather than a consortium of native was used to combat pathogenic V. coralliilyticus and protect corals from bleaching. R. profundi showed therapeutic activity in vivo , preventing a significant reduction in bacterial diversity in bleached corals. Notably, the structure of the bacterial community differed significantly among all the groups. In addition, compared with the bleached corals caused by V. coralliilyticus , the network analysis revealed that complex interactions and positive correlations in the bacterial community of the R. profundi protected non-bleached corals, indicating R. profundi ’s role in fostering synergistic associations. Many genera of bacteria significantly increased in abundance during V. coralliilyticus infection, including Vibrio , Alteromonas , Amphritea , and Nautella , contributing to the pathogenicity of the bacterial community. However, R. profundi effectively countered the proliferation of these genera, promoting potential probiotic Endozoicomonas and other taxa, while reducing the abundance of betaine lipids and the type VI section system of the bacterial community. These changes ultimately influenced the interactive relationships among symbionts and demonstrated that probiotic R. profundi intervention can modulate coral-associated bacterial community, alleviate pathogenic-induced dysbiosis, and preserve coral health. These findings elucidated the relationship between the behavior of the coral-associated bacterial community and the occurrence of pathological coral bleaching. IMPORTANCE Changes in the global climate and marine environment can influence coral host and pathogen repartition which refers to an increased likelihood of pathogen infection in hosts. The risk of Vibrio coralliilyticus -induced coral disease is significantly heightened, primarily due to its thermos-dependent expression of virulent and populations. This study investigates how coral-associated bacterial communities respond to bleaching induced by V. coralliilyticus . Our findings demonstrate that Ruegeria profundi exhibits clear evidence of defense against pathogenic bacterial infection, contributing to the maintenance of host health and symbiont homeostasis. This observation suggests that bacterial pathogens could cause dysbiosis in coral holobionts. Probiotic bacteria display an essential capability in restructuring and manipulating coral-associated bacterial communities. This restructuring effectively reduces bacterial community virulence and enhances the pathogenic resistance of holobionts. The study provides valuable insights into the correlation between the health status of corals and how coral-associated bacterial communities may respond to both pathogens and probiotics.

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Transmission studies and the composition of prokaryotic communities associated with healthy and diseasedAplysina cauliformissponges suggest thatAplysinaRed Band Syndrome is a prokaryotic polymicrobial disease

Cited by 2 publications

References 130 publications

Impacts of humic substances, elevated temperature, and UVB radiation on bacterial communities of the marine sponge Chondrilla sp

Impacts of humic substances, elevated temperature, and UVB radiation on bacterial communities of the marine sponge Chondrilla sp

Mitigation of Vibrio coralliilyticus -induced coral bleaching through bacterial dysbiosis prevention by Ruegeria profundi

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