The Family Shewanellaceae

Satomi, Masataka

doi:10.1007/978-3-642-38922-1_226

Cited by 26 publications

(20 citation statements)

References 183 publications

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“…Genera classified under these families are ubiquitous throughout marine environments, described in tropical ( Bourne and Munn, 2005 ; Ritchie, 2006 ; Thompson et al, 2006 ; Shnit-Orland and Kushmaro, 2009 ; Shnit-Orland et al, 2010 ), temperate ( La Rivière et al, 2015 ), and cold-water coral species ( Kellogg, 2008 ; Kellogg et al, 2009 ; Galkiewicz et al, 2011 ; Gray et al, 2011 ). Their presence in cold-water environments was expected as many members of both Shewanellaceae and Colwelliaceae are psychrophilic (organisms capable of growing in cold, extreme environments; Bowman, 2014 ; Satomi, 2014 ). Biochemical properties of Colwelliaceae members include energy production through the decomposition of organic matter and nitrate reduction ( Bowman, 2014 ).…”

Section: Discussionmentioning

confidence: 99%

Coral-Associated Bacterial Diversity Is Conserved across Two Deep-Sea Anthothela Species

et al. 2016

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Cold-water corals, similar to tropical corals, contain diverse and complex microbial assemblages. These bacteria provide essential biological functions within coral holobionts, facilitating increased nutrient utilization and production of antimicrobial compounds. To date, few cold-water octocoral species have been analyzed to explore the diversity and abundance of their microbial associates. For this study, 23 samples of the family Anthothelidae were collected from Norfolk (n = 12) and Baltimore Canyons (n = 11) from the western Atlantic in August 2012 and May 2013. Genetic testing found that these samples comprised two Anthothela species (Anthothela grandiflora and Anthothela sp.) and Alcyonium grandiflorum. DNA was extracted and sequenced with primers targeting the V4–V5 variable region of the 16S rRNA gene using 454 pyrosequencing with GS FLX Titanium chemistry. Results demonstrated that the coral host was the primary driver of bacterial community composition. Al. grandiflorum, dominated by Alteromonadales and Pirellulales had much higher species richness, and a distinct bacterial community compared to Anthothela samples. Anthothela species (A. grandiflora and Anthothela sp.) had very similar bacterial communities, dominated by Oceanospirillales and Spirochaetes. Additional analysis of core-conserved bacteria at 90% sample coverage revealed genus level conservation across Anthothela samples. This core included unclassified Oceanospirillales, Kiloniellales, Campylobacterales, and genus Spirochaeta. Members of this core were previously recognized for their functional capabilities in nitrogen cycling and suggest the possibility of a nearly complete nitrogen cycle within Anthothela species. Overall, many of the bacterial associates identified in this study have the potential to contribute to the acquisition and cycling of nutrients within the coral holobiont.

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Section: Discussionmentioning

confidence: 99%

Coral-Associated Bacterial Diversity Is Conserved across Two Deep-Sea Anthothela Species

et al. 2016

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“…In addition, the relative abundance of a Shewanella-affiliated phylotype increased in the unsupplemented control but did not increase in the glucose treatment (Table 3). Most Flavobacterium-related species are obligate aerobes (66), and most Shewanella-affiliated species are respiratory and not capable of fermentation (67,68). The lack of a strong response of the Shewanella-and Flavobacterium-affiliated phylotypes in saccharide-supplemented treatments indicated that these phylotypes were less competitive than the aforementioned fermentative phylotypes under these conditions.…”

Section: Aeromonadaceae Aeromonas-affiliated Phylotype a [Lt838791]mentioning

confidence: 99%

Differential Engagement of Fermentative Taxa in Gut Contents of the Earthworm Lumbricus terrestris

Meier

Hunger

Drake

2018

Appl Environ Microbiol

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The earthworm gut is an anoxic, saccharide-rich microzone in aerated soils. The apparent degradation of diverse saccharides in the alimentary canal of the model earthworm is concomitant with the production of diverse organic acids, indicating that fermentation is an ongoing process in the earthworm gut. However, little is known about how different gut-associated saccharides are fermented. The hypothesis of this investigation was that different gut-associated saccharides differentially stimulate fermentative microorganisms in gut contents of This hypothesis was addressed by (i) assessing the fermentation profiles of anoxic gut content microcosms that were supplemented with gut-associated saccharides and (ii) the concomitant phylogenic analysis of 16S rRNA sequences. Galactose, glucose, maltose, mannose, arabinose, fucose, rhamnose, and xylose stimulated the production of fermentation products, including H, CO, acetate, lactate, propionate, formate, succinate, and ethanol. Fermentation profiles were dependent on the supplemental saccharide (e.g., glucose yielded large amounts of H and ethanol, whereas fucose did not, and maltose yielded large amounts of lactate, whereas mannose did not). Approximately 1,750,000 16S rRNA sequences were affiliated with 37 families, and phylogenic analyses indicated that a respective saccharide stimulated a subset of the diverse phylotypes. An -related phylotype displayed a high relative abundance in all treatments, whereas key-affiliated phylotypes were stimulated by some but not all saccharides. Collectively, these results reinforce the likelihood that (i) different saccharides stimulate different fermentations in gut contents of the earthworm and (ii) facultative aerobes related to and can be important drivers of these fermentations. The feeding habits of earthworms influence the turnover of elements in the terrestrial biosphere. The alimentary tract of the earthworm constitutes an anoxic saccharide-rich microzone in aerated soils that offers ingested microbes a unique opportunity for anaerobic growth. The fermentative activity of microbes in the alimentary tract are responsible for the production of (i) organic compounds that can be assimilated by the earthworm and (ii) H that is subject to emission by the earthworm and can be trophically linked to secondary microbial events in soils. To gain insight on how fermentative members of the gut microbiome might respond to the saccharide-rich alimentary canal, this study examines the impact of diverse gut-associated saccharides on the differential activation of fermentative microbes in gut contents of the model earthworm.

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“…Usually, the antibiotic therapy adopted includes beta-lactams, aminoglycosides and quinolones. These bacteria are generally susceptible to third and fourth generation cephalosporins, carbapenems, beta-lactamase inhibitor combinations, aminoglycosides, chloramphenicol, erythromycin, aztreonam and quinolones [2,5,6]. However, resistance to these drugs is increasing due to the presence in their chromosome of class D beta-lactamase encoding genes (bla OXA ) conferring resistance to carbapenems, class C beta-lactamases (bla AmpC ) which decrease the susceptibility to cephalosporins and qnr genes responsible for resistance to quinolones [4,[7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Resistome, Mobilome and Virulome Analysis of Shewanella algae and Vibrio spp. Strains Isolated in Italian Aquaculture Centers

et al. 2020

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Antimicrobial resistance is a major public health concern restricted not only to healthcare settings but also to veterinary and environmental ones. In this study, we analyzed, by whole genome sequencing (WGS) the resistome, mobilome and virulome of 12 multidrug-resistant (MDR) marine strains belonging to Shewanellaceae and Vibrionaceae families collected at aquaculture centers in Italy. The results evidenced the presence of several resistance mechanisms including enzyme and efflux pump systems conferring resistance to beta-lactams, quinolones, tetracyclines, macrolides, polymyxins, chloramphenicol, fosfomycin, erythromycin, detergents and heavy metals. Mobilome analysis did not find circular elements but class I integrons, integrative and conjugative element (ICE) associated modules, prophages and different insertion sequence (IS) family transposases. These mobile genetic elements (MGEs) are usually present in other aquatic bacteria but also in Enterobacteriaceae suggesting their transferability among autochthonous and allochthonous bacteria of the resilient microbiota. Regarding the presence of virulence factors, hemolytic activity was detected both in the Shewanella algae and in Vibrio spp. strains. To conclude, these data indicate the role as a reservoir of resistance and virulence genes in the environment of the aquatic microbiota present in the examined Italian fish farms that potentially might be transferred to bacteria of medical interest.

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The Family Shewanellaceae

Cited by 26 publications

References 183 publications

Coral-Associated Bacterial Diversity Is Conserved across Two Deep-Sea Anthothela Species

Coral-Associated Bacterial Diversity Is Conserved across Two Deep-Sea Anthothela Species

Differential Engagement of Fermentative Taxa in Gut Contents of the Earthworm Lumbricus terrestris

Resistome, Mobilome and Virulome Analysis of Shewanella algae and Vibrio spp. Strains Isolated in Italian Aquaculture Centers

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