<i>Aeromonadales ord. nov</i>

Martin‐Carnahan, Amy; Joseph, Shirley A.

doi:10.1002/9781118960608.obm00093

Cited by 10 publications

(12 citation statements)

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“…2 ). According to the Bergey’s Manual of Systematic Bacteriology [ 1 ], the requirements of this subspecies are not different than those of the other salmonicida subspecies. However, we cannot rule out the possibility that the smithia subspecies has specific unknown growth requirements.…”

Section: Resultsmentioning

confidence: 99%

“…The Aeromonas genus (also known as aeromonads) has a complex taxonomy, with fourteen species officially recognized in the latest edition of the Bergey’s Manual of Systematic Bacteriology [ 1 ]. However, recent works like the one of Colston et al in 2014 showed, based on molecular phylogenies (house-keeping genes and core genomes), average nucleotide identities (ANI), and in silico DNA-DNA hybridization ( is DDH), that aeromonads have a greater taxonomic richness [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

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Increasing genomic diversity and evidence of constrained lifestyle evolution due to insertion sequences in Aeromonas salmonicida

et al. 2016

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BackgroundAeromonads make up a group of Gram-negative bacteria that includes human and fish pathogens. The Aeromonas salmonicida species has the peculiarity of including five known subspecies. However, few studies of the genomes of A. salmonicida subspecies have been reported to date.ResultsWe sequenced the genomes of additional A. salmonicida isolates, including three from India, using next-generation sequencing in order to gain a better understanding of the genomic and phylogenetic links between A. salmonicida subspecies. Their relative phylogenetic positions were confirmed by a core genome phylogeny based on 1645 gene sequences. The Indian isolates, which formed a sub-group together with A. salmonicida subsp. pectinolytica, were able to grow at either at 18 °C and 37 °C, unlike the A. salmonicida psychrophilic isolates that did not grow at 37 °C. Amino acid frequencies, GC content, tRNA composition, loss and gain of genes during evolution, pseudogenes as well as genes under positive selection and the mobilome were studied to explain this intraspecies dichotomy.ConclusionInsertion sequences appeared to be an important driving force that locked the psychrophilic strains into their particular lifestyle in order to conserve their genomic integrity. This observation, based on comparative genomics, is in agreement with previous results showing that insertion sequence mobility induced by heat in A. salmonicida subspecies causes genomic plasticity, resulting in a deleterious effect on the virulence of the bacterium. We provide a proof-of-concept that selfish DNAs play a major role in the evolution of bacterial species by modeling genomes.Electronic supplementary materialThe online version of this article (doi:10.1186/s12864-016-2381-3) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Increasing genomic diversity and evidence of constrained lifestyle evolution due to insertion sequences in Aeromonas salmonicida

et al. 2016

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“…Members of the genus Aeromonas belong to the family Aeromonadaceae in the order Aeromonadales ( Martin-Carnahan and Joseph, 2005 ). Aeromonas species are Gram-negative rods and facultative anaerobes, and can be isolated from a variety of sources such as water and sewage, from various aquatic environments and clinical tissue samples from human or animals, from food sources such as meat, poultry, seafood and vegetables, and from chironomids ( Janda and Abbott, 1998 ; Halpern et al, 2007 ; Pérez-Valdespino et al, 2009 ).…”

Section: Aeromonasmentioning

confidence: 99%

Chironomids’ Relationship with Aeromonas Species

Laviad

Halpern

2016

Front. Microbiol.

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Chironomids (Diptera: Chironomidae), also known as non-biting midges, are one of the most abundant groups of insects in aquatic habitats. They undergo a complete metamorphosis of four life stages of which three are aquatic (egg, larva, and pupa), and the adult emerges into the air. Chironomids serve as a natural reservoir of Aeromonas and Vibrio cholerae species. Here, we review existing knowledge about the mutual relations between Aeromonas species and chironomids. Using 454-pyrosequencing of the 16S rRNA gene, we found that the prevalence of Aeromonas species in the insects’ egg masses and larvae was 1.6 and 3.3% of the insects’ endogenous microbiota, respectively. Aeromonas abundance per egg mass remained stable during a 6-month period of bacterial monitoring. Different Aeromonas species were isolated and some demonstrated the ability to degrade the insect’s egg masses and to prevent eggs hatching. Chitinase was identified as the enzyme responsible for the egg mass degradation. Different Aeromonas species isolated from chironomids demonstrated the potential to protect their host from toxic metals. Aeromonas is a causative agent of fish infections. Fish are frequently recorded as feeding on chironomids. Thus, fish might be infected with Aeromonas species via chironomid consumption. Aeromonas strains are also responsible for causing gastroenteritis and wound infections in humans. Different virulence genes were identified in Aeromonas species isolated from chironomids. Chironomids may infest drinking water reservoirs, hence be the source of pathogenic Aeromonas strains in drinking water. Chironomids and Aeromonas species have a complicated mutual relationship.

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“…Of the five subspecies of this Gram‐negative pathogen, A. salmonicida subsp. salmonicida (i.e., typical isolates) largely causes infections in salmonid species, whereas the remaining four subspecies (i.e., the atypical isolates: achromogenes , masoucida , smithia and pectinolytica ; Martin‐Carnahan & Joseph, 2005) affect non‐salmonid fish (Menanteau‐Ledouble et al., 2016). Non‐salmonid cleaner fish, such as ballan wrasse ( Labrus bergylta Ascanius, 1767) and lumpfish ( Cyclopterus lumpus Linnaeus, 1758), are cultured for deployment at Atlantic salmon ( Salmo salar Linnaeus, 1758) farms as a biological approach to control populations of sea lice (mainly Lepeophtheirus salmonis Krøyer, 1837), which are exoparasitic crustaceans causing great concern for salmon producers (Brooker et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

Antibiotics modulate biofilm formation in fish pathogenic isolates of atypical Aeromonas salmonicida

Desbois

Cook

Buba

2020

Journal of Fish Diseases

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Aeromonadales ord. nov

Abstract: Ae.ro.mo.na.da' les . M.L. fem. n. Aeromonas type genus of the family and order; suff. ‐ ales to denote an order; M.L. pl. n. Aeromonadales the Aeromonas order. Proteobacteria / Gammaproteobacteria / Aeromonadales

Cited by 10 publications

References 1 publication

Increasing genomic diversity and evidence of constrained lifestyle evolution due to insertion sequences in Aeromonas salmonicida

Increasing genomic diversity and evidence of constrained lifestyle evolution due to insertion sequences in Aeromonas salmonicida

Chironomids’ Relationship with Aeromonas Species

Antibiotics modulate biofilm formation in fish pathogenic isolates of atypical Aeromonas salmonicida

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