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Coubris C, Duchatelet L, Dupont S, Mallefet J. A brittle star is born: Ontogeny of luminous capabilities in Amphiura filiformis. PLoS One 2024; 19:e0298185. [PMID: 38466680 PMCID: PMC10927081 DOI: 10.1371/journal.pone.0298185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Accepted: 01/20/2024] [Indexed: 03/13/2024] Open
Abstract
Bioluminescence is the production of visible light by living organisms thanks to a chemical reaction, implying the oxidation of a substrate called luciferin catalyzed by an enzyme, the luciferase. The luminous brittle star Amphiura filiformis depends on coelenterazine (i.e., the most widespread luciferin in marine ecosystems) and a luciferase homologous to the cnidarian Renilla luciferase to produce blue flashes in the arm's spine. Only a few studies have focused on the ontogenic apparitions of bioluminescence in marine organisms. Like most ophiuroids, A. filiformis displays planktonic ophiopluteus larvae for which the ability to produce light was not investigated. This study aims to document the apparition of the luminous capabilities of this species during its ontogenic development, from the egg to settlement. Through biochemical assays, pharmacological stimulation, and Renilla-like luciferase immunohistological detection across different developing stages, we pointed out the emergence of the luminous capabilities after the ophiopluteus larval metamorphosis into a juvenile. In conclusion, we demonstrated that the larval pelagic stage of A. filiformis is not bioluminescent compared to juveniles and adults.
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Affiliation(s)
- Constance Coubris
- Marine Biology Laboratory, Earth and Life Institute, Université catholique de Louvain, Louvain-La-Neuve, Belgium
| | - Laurent Duchatelet
- Marine Biology Laboratory, Earth and Life Institute, Université catholique de Louvain, Louvain-La-Neuve, Belgium
| | - Sam Dupont
- Department of Biological & Environmental Sciences, University of Gothenburg, Fiskebäckskil, Sweden
- IAEA Marine Environment Laboratories, Radioecology Laboratory, Monaco City, Monaco
| | - Jérôme Mallefet
- Marine Biology Laboratory, Earth and Life Institute, Université catholique de Louvain, Louvain-La-Neuve, Belgium
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2
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Vibrio spp.: Life Strategies, Ecology, and Risks in a Changing Environment. DIVERSITY 2022. [DOI: 10.3390/d14020097] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Vibrios are ubiquitous bacteria in aquatic systems, especially marine ones, and belong to the Gammaproteobacteria class, the most diverse class of Gram-negative bacteria. The main objective of this review is to update the information regarding the ecology of Vibrio species, and contribute to the discussion of their potential risk in a changing environment. As heterotrophic organisms, Vibrio spp. live freely in aquatic environments, from marine depths to the surface of the water column, and frequently may be associated with micro- and macroalgae, invertebrates, and vertebrates such as fish, or live in symbiosis. Some Vibrio spp. are pathogenic to humans and animals, and there is evidence that infections caused by vibrios are increasing in the world. This rise may be related to global changes in human behavior (increases in tourism, maritime traffic, consumption of seafood, aquaculture production, water demand, pollution), and temperature. Most likely in the future, Vibrio spp. in water and in seafood will be monitored in order to safeguard human and animal health. Regulators of the microbiological quality of water (marine and freshwater) and food for human and animal consumption, professionals involved in marine and freshwater production chains, consumers and users of aquatic resources, and health professionals will be challenged to anticipate and mitigate new risks.
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3
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Side DD, Nassisi V, Pennetta C, Alifano P, Di Salvo M, Talà A, Chechkin A, Seno F, Trovato A. Bacterial bioluminescence onset and quenching: a dynamical model for a quorum sensing-mediated property. ROYAL SOCIETY OPEN SCIENCE 2017; 4:171586. [PMID: 29308273 PMCID: PMC5750040 DOI: 10.1098/rsos.171586] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 11/09/2017] [Indexed: 06/07/2023]
Abstract
We present an effective dynamical model for the onset of bacterial bioluminescence, one of the most studied quorum sensing-mediated traits. Our model is built upon simple equations that describe the growth of the bacterial colony, the production and accumulation of autoinducer signal molecules, their sensing within bacterial cells, and the ensuing quorum activation mechanism that triggers bioluminescent emission. The model is directly tested to quantitatively reproduce the experimental distributions of photon emission times, previously measured for bacterial colonies of Vibrio jasicida, a luminescent bacterium belonging to the Harveyi clade, growing in a highly drying environment. A distinctive and novel feature of the proposed model is bioluminescence 'quenching' after a given time elapsed from activation. Using an advanced fitting procedure based on the simulated annealing algorithm, we are able to infer from the experimental observations the biochemical parameters used in the model. Such parameters are in good agreement with the literature data. As a further result, we find that, at least in our experimental conditions, light emission in bioluminescent bacteria appears to originate from a subtle balance between colony growth and quorum activation due to autoinducers diffusion, with the two phenomena occurring on the same time scale. This finding is consistent with a negative feedback mechanism previously reported for Vibrio harveyi.
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Affiliation(s)
- Domenico Delle Side
- Dipartimento di Matematica e Fisica ‘Ennio De Giorgi’, Università del Salento, Lecce, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Lecce, Italy
| | - Vincenzo Nassisi
- Dipartimento di Matematica e Fisica ‘Ennio De Giorgi’, Università del Salento, Lecce, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Lecce, Italy
| | - Cecilia Pennetta
- Dipartimento di Matematica e Fisica ‘Ennio De Giorgi’, Università del Salento, Lecce, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Lecce, Italy
| | - Pietro Alifano
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Lecce, Italy
| | - Marco Di Salvo
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Lecce, Italy
| | - Adelfia Talà
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Lecce, Italy
| | - Aleksei Chechkin
- Akhiezer Institute for Theoretical Physics, Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine
- Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, Germany
- Dipartimento di Fisica e Astronomia ‘Galileo Galilei’, Università di Padova, Padova, Italy
| | - Flavio Seno
- Dipartimento di Fisica e Astronomia ‘Galileo Galilei’, Università di Padova, Padova, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova, Italy
| | - Antonio Trovato
- Dipartimento di Fisica e Astronomia ‘Galileo Galilei’, Università di Padova, Padova, Italy
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova, Italy
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4
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Hendry TA, Dunlap PV. Phylogenetic divergence between the obligate luminous symbionts of flashlight fishes demonstrates specificity of bacteria to host genera. ENVIRONMENTAL MICROBIOLOGY REPORTS 2014; 6:331-338. [PMID: 24992531 DOI: 10.1111/1758-2229.12135] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Accepted: 12/09/2013] [Indexed: 06/03/2023]
Abstract
The luminous bacterial symbionts of anomalopid flashlight fishes, which appear to be obligately dependent on their hosts for growth, share several evolutionary patterns with unrelated obligate bacteria. However, only one flashlight fish symbiont species has been characterized in detail, and it is therefore not known if the bacteria from other anomalopid species are highly divergent (a pattern common to obligate symbionts). Unlike most obligate symbionts, the bacteria symbiotic with anomalopids are extracellular and spend time outside their hosts in the environment, from which they are thought to colonize new host generations. Environmental acquisition might decrease the likelihood of bacterial divergence between host species. We used phylogenetic analysis to determine the relatedness of symbionts from different anomalopid host species. The symbionts of hosts in the genus Photoblepharon were resolved as a new species, for which we propose the name 'Candidatus Photodesmus blepharus'. Furthermore, different genera of anomalopids were found to harbour different species of bacteria, even when the hosts overlapped in geographic range. This finding suggests that the divergence between bacterial species is not the result of geographic isolation. The specificity of symbionts to host genera is consistent with obligate dependence on the host and has implications for symbiont transmission.
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Affiliation(s)
- Tory A Hendry
- Department of Ecology and Evolutionary Biology, University of Michigan, 830 North University Ave., Ann Arbor, MI, 48109-1048, USA
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5
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Urbanczyk H, Urbanczyk Y, Hayashi T, Ogura Y. Diversification of two lineages of symbiotic Photobacterium. PLoS One 2013; 8:e82917. [PMID: 24349398 PMCID: PMC3862722 DOI: 10.1371/journal.pone.0082917] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Accepted: 10/29/2013] [Indexed: 11/19/2022] Open
Abstract
Understanding of processes driving bacterial speciation requires examination of closely related, recently diversified lineages. To gain an insight into diversification of bacteria, we conducted comparative genomic analysis of two lineages of bioluminescent symbionts, Photobacterium leiognathi and 'P. mandapamensis'. The two lineages are evolutionary and ecologically closely related. Based on the methods used in bacterial taxonomy for classification of new species (DNA-DNA hybridization and ANI), genetic relatedness of the two lineages is at a cut-off point for species delineation. In this study, we obtained the whole genome sequence of a representative P. leiognathi strain lrivu.4.1, and compared it to the whole genome sequence of 'P. mandapamensis' svers.1.1. Results of the comparative genomic analysis suggest that P. leiognathi has a more plastic genome and acquired genes horizontally more frequently than 'P. mandapamensis'. We predict that different rates of recombination and gene acquisition contributed to diversification of the two lineages. Analysis of lineage-specific sequences in 25 strains of P. leiognathi and 'P. mandapamensis' found no evidence that bioluminescent symbioses with specific host animals have played a role in diversification of the two lineages.
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Affiliation(s)
- Henryk Urbanczyk
- Interdisciplinary Research Organization, University of Miyazaki, Miyazaki, Japan
| | - Yoshiko Urbanczyk
- Interdisciplinary Research Organization, University of Miyazaki, Miyazaki, Japan
| | - Tetsuya Hayashi
- Division of Bioenvironmental Science, Frontier Science Research Center, University of Miyazaki, Miyazaki, Japan
- Division of Microbiology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
| | - Yoshitoshi Ogura
- Division of Bioenvironmental Science, Frontier Science Research Center, University of Miyazaki, Miyazaki, Japan
- Division of Microbiology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan
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6
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Hendry TA, de Wet JR, Dunlap PV. Genomic signatures of obligate host dependence in the luminous bacterial symbiont of a vertebrate. Environ Microbiol 2013; 16:2611-22. [DOI: 10.1111/1462-2920.12302] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Accepted: 10/01/2013] [Indexed: 11/30/2022]
Affiliation(s)
- Tory A. Hendry
- Department of Ecology and Evolutionary Biology; University of Michigan; 830 North University Ave. Ann Arbor MI 48109-1048 USA
| | - Jeffrey R. de Wet
- Department of Computational Medicine and Bioinformatics; University of Michigan Medical School; 100 Washtenaw Ave. Ann Arbor MI 48109-2218 USA
| | - Paul V. Dunlap
- Department of Ecology and Evolutionary Biology; University of Michigan; 830 North University Ave. Ann Arbor MI 48109-1048 USA
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7
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Guerrero-Ferreira R, Gorman C, Chavez AA, Willie S, Nishiguchi MK. Characterization of the bacterial diversity in Indo-West Pacific loliginid and sepiolid squid light organs. MICROBIAL ECOLOGY 2013; 65:214-26. [PMID: 22885637 PMCID: PMC3557516 DOI: 10.1007/s00248-012-0099-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 04/07/2012] [Indexed: 06/01/2023]
Abstract
Loliginid and sepiolid squid light organs are known to host a variety of bacterial species from the family Vibrionaceae, yet little is known about the species diversity and characteristics among different host squids. Here we present a broad-ranging molecular and physiological analysis of the bacteria colonizing light organs in loliginid and sepiolid squids from various field locations of the Indo-West Pacific (Australia and Thailand). Our PCR-RFLP analysis, physiological characterization, carbon utilization profiling, and electron microscopy data indicate that loliginid squid in the Indo-West Pacific carry a consortium of bacterial species from the families Vibrionaceae and Photobacteriaceae. This research also confirms our previous report of the presence of Vibrio harveyi as a member of the bacterial population colonizing light organs in loliginid squid. pyrH sequence data were used to confirm isolate identity, and indicates that Vibrio and Photobacterium comprise most of the light organ colonizers of squids from Australia, confirming previous reports for Australian loliginid and sepiolid squids. In addition, combined phylogenetic analysis of PCR-RFLP and 16S rDNA data from Australian and Thai isolates associated both Photobacterium and Vibrio clades with both loliginid and sepiolid strains, providing support that geographical origin does not correlate with their relatedness. These results indicate that both loliginid and sepiolid squids demonstrate symbiont specificity (Vibrionaceae), but their distribution is more likely due to environmental factors that are present during the infection process. This study adds significantly to the growing evidence for complex and dynamic associations in nature and highlights the importance of exploring symbiotic relationships in which non-virulent strains of pathogenic Vibrio species could establish associations with marine invertebrates.
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Affiliation(s)
- Ricardo Guerrero-Ferreira
- Department of Pediatrics, Division of Pediatric Infectious Diseases, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Clayton Gorman
- Department of Biology, New Mexico State University, Las Cruces, NM 88003-8001, USA
| | - Alba A. Chavez
- Department of Biology, New Mexico State University, Las Cruces, NM 88003-8001, USA
| | - Shantell Willie
- Department of Biology, New Mexico State University, Las Cruces, NM 88003-8001, USA
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8
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Dunlap PV, Gould AL, Wittenrich ML, Nakamura M. Symbiosis initiation in the bacterially luminous sea urchin cardinalfish Siphamia versicolor. JOURNAL OF FISH BIOLOGY 2012; 81:1340-1356. [PMID: 22957874 DOI: 10.1111/j.1095-8649.2012.03415.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
To determine how each new generation of the sea urchin cardinalfish Siphamia versicolor acquires the symbiotic luminous bacterium Photobacterium mandapamensis, and when in its development the S. versicolor initiates the symbiosis, procedures were established for rearing S. versicolor larvae in an aposymbiotic state. Under the conditions provided, larvae survived and developed for 28 days after their release from the mouths of males. Notochord flexion began at 8 days post release (dpr). By 28 dpr, squamation was evident and the caudal complex was complete. The light organ remained free of bacteria but increased in size and complexity during development of the larvae. Thus, aposymbiotic larvae of the fish can survive and develop for extended periods, major components of the luminescence system develop in the absence of the bacteria and the bacteria are not acquired directly from a parent, via the egg or during mouth brooding. Presentation of the symbiotic bacteria to aposymbiotic larvae at 8-10 dpr, but not earlier, led to initiation of the symbiosis. Upon colonization of the light organ, the bacterial population increased rapidly and cells forming the light-organ chambers exhibited a differentiated appearance. Therefore, the light organ apparently first becomes receptive to colonization after 1 week post-release development, the symbiosis is initiated by bacteria acquired from the environment and bacterial colonization induces morphological changes in the nascent light organ. The abilities to culture larvae of S. versicolor for extended periods and to initiate the symbiosis in aposymbiotic larvae are key steps in establishing the experimental tractability of this highly specific vertebrate and microbe mutualism.
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Affiliation(s)
- P V Dunlap
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109-1048, USA.
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9
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Urbanczyk H, Kiwaki N, Furukawa T, Iwatsuki Y. Limited geographic distribution of certain strains of the bioluminescent symbiont Photobacterium leiognathi. FEMS Microbiol Ecol 2012; 81:355-63. [PMID: 22404110 DOI: 10.1111/j.1574-6941.2012.01353.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Revised: 02/08/2012] [Accepted: 02/26/2012] [Indexed: 11/29/2022] Open
Affiliation(s)
- Henryk Urbanczyk
- Interdisciplinary Research Organization; University of Miyazaki; Miyazaki; Japan
| | - Naomi Kiwaki
- Interdisciplinary Research Organization; University of Miyazaki; Miyazaki; Japan
| | - Takashi Furukawa
- Interdisciplinary Research Organization; University of Miyazaki; Miyazaki; Japan
| | - Yukio Iwatsuki
- Faculty of Agriculture; University of Miyazaki; Miyazaki; Japan
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10
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Figge MJ, Robertson LA, Ast JC, Dunlap PV. Historical microbiology: revival and phylogenetic analysis of the luminous bacterial cultures of M. W. Beijerinck. FEMS Microbiol Ecol 2011; 78:463-72. [PMID: 22066815 DOI: 10.1111/j.1574-6941.2011.01177.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Revised: 07/21/2011] [Accepted: 07/24/2011] [Indexed: 11/29/2022] Open
Abstract
Luminous bacteria isolated by Martinus W. Beijerinck were sealed in glass ampoules in 1924 and 1925 and stored under the names Photobacterium phosphoreum and 'Photobacterium splendidum'. To determine if the stored cultures were viable and to assess their evolutionary relationship with currently recognized bacteria, portions of the ampoule contents were inoculated into culture medium. Growth and luminescence were evident after 13 days of incubation, indicating the presence of viable cells after more than 80 years of storage. The Beijerinck strains are apparently the oldest bacterial cultures to be revived from storage. Multi-locus sequence analysis, based on the 16S rRNA, gapA, gyrB, pyrH, recA, luxA, and luxB genes, revealed that the Beijerinck strains are distant from the type strains of P. phosphoreum, ATCC 11040(T), and Vibrio splendidus, ATCC 33125(T), and instead form an evolutionarily distinct clade of Vibrio. Newly isolated strains from coastal seawater in Norway, France, Uruguay, Mexico, and Japan grouped with the Beijerinck strains, indicating a global distribution for this new clade, designated as the beijerinckii clade. Strains of the beijerinckii clade exhibited little sequence variation for the seven genes and approximately 6300 nucleotides examined despite the geographic distances and the more than 80 years separating their isolation. Gram-negative bacteria therefore can survive for many decades in liquid storage, and in nature, they do not necessarily diverge rapidly over time.
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Affiliation(s)
- Marian J Figge
- The Netherlands Culture Collection of Bacteria, CBS-KNAW Fungal Biodiversity Centre, Utrecht, The Netherlands
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11
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Dunlap PV, Nakamura M. Functional morphology of the luminescence system of Siphamia versicolor (Perciformes: Apogonidae), a bacterially luminous coral reef fish. J Morphol 2011; 272:897-909. [DOI: 10.1002/jmor.10956] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2010] [Revised: 01/25/2011] [Accepted: 02/18/2011] [Indexed: 11/11/2022]
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12
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Urbanczyk H, Ast JC, Dunlap PV. Phylogeny, genomics, and symbiosis of Photobacterium. FEMS Microbiol Rev 2010; 35:324-42. [PMID: 20883503 DOI: 10.1111/j.1574-6976.2010.00250.x] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Photobacterium comprises several species in Vibrionaceae, a large family of Gram-negative, facultatively aerobic, bacteria that commonly associate with marine animals. Members of the genus are widely distributed in the marine environment and occur in seawater, surfaces, and intestines of marine animals, marine sediments and saline lake water, and light organs of fish. Seven Photobacterium species are luminous via the activity of the lux genes, luxCDABEG. Much recent progress has been made on the phylogeny, genomics, and symbiosis of Photobacterium. Phylogenetic analysis demonstrates a robust separation between Photobacterium and its close relatives, Aliivibrio and Vibrio, and reveals the presence of two well-supported clades. Clade 1 contains luminous and symbiotic species and one species with no luminous members, and Clade 2 contains mostly nonluminous species. The genomes of Photobacterium are similar in size, structure, and organization to other members of Vibrionaceae, with two chromosomes of unequal size and multiple rrn operons. Many species of marine fish form bioluminescent symbioses with three Photobacterium species: Photobacterium kishitanii, Photobacterium leiognathi, and Photobacterium mandapamensis. These associations are highly, but not strictly species specific, and they do not exhibit symbiont-host codivergence. Environmental congruence instead of host selection might explain the patterns of symbiont-host affiliation observed from nature.
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Affiliation(s)
- Henryk Urbanczyk
- Interdisciplinary Research Organization, University of Miyazaki, Miyazaki, Japan
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13
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Guerrero-Ferreira RC, Nishiguchi MK. Differential gene expression in bacterial symbionts from loliginid squids demonstrates variation between mutualistic and environmental niches. ENVIRONMENTAL MICROBIOLOGY REPORTS 2010; 2:514-523. [PMID: 20680094 PMCID: PMC2911791 DOI: 10.1111/j.1758-2229.2009.00077.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Luminescent bacteria (gamma-Proteobacteria: Vibrionaceae) are found in complex bilobed light organs of both sepiolid and loliginid squids (Mollusca: Cephalopoda). Despite the existence of multiple strain colonization between Vibrio bacteria and loliginid squids, specificity at the genus level still exists and may influence interactions between symbiotic and free-living stages of the symbiont. The environmentally transmitted behaviour of Vibrio symbionts bestows a certain degree of recognition that exists prior and subsequent to the colonization process. Therefore, we identified bacterial genes required for successful colonization of loliginid light organs by examining transcripts solely expressed in either the light organ or free-living stages. Selective capture of transcribed sequences (SCOTS) was used to differentiate genes expressed by the same bacterium when thriving in two different environments (i.e. loliginid light organs and seawater). Genes specific for squid light organs included vulnibactin synthetase, outer membrane protein W and dihydroxy dehydratase, which have been associated with the maintenance of bacterial host associations in other systems. In contrast, genes that were solely expressed in the free-living condition consisted of transcripts recognized as important factors for bacterial survival in the environment. These transcripts included genes for methyl accepting chemotaxis proteins, arginine decarboxylase and chitinase. These results provide valuable information regarding mechanisms determining specificity, establishment, and maintenance of bacteria-squid associations.
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14
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Chaston J, Goodrich-Blair H. Common trends in mutualism revealed by model associations between invertebrates and bacteria. FEMS Microbiol Rev 2010; 34:41-58. [PMID: 19909347 PMCID: PMC2794943 DOI: 10.1111/j.1574-6976.2009.00193.x] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Mutually beneficial interactions between microorganisms and animals are a conserved and ubiquitous feature of biotic systems. In many instances animals, including humans, are dependent on their microbial associates for nutrition, defense, or development. To maintain these vital relationships, animals have evolved processes that ensure faithful transmission of specific microbial symbionts between generations. Elucidating mechanisms of transmission and symbiont specificity has been aided by the study of experimentally tractable invertebrate animals with diverse and highly evolved associations with microorganisms. Here, we review several invertebrate model systems that contribute to our current understanding of symbiont transmission, recognition, and specificity. Although the details of transmission and symbiont selection vary among associations, comparisons of diverse mutualistic associations are revealing a number of common themes, including restriction of symbiont diversity during transmission and glycan-lectin interactions during partner selection and recruitment.
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Affiliation(s)
- John Chaston
- Department of Bacteriology, University of Wisconsin-Madison, Madison, WI, USA
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15
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GUERRERO-FERREIRA RC, NISHIGUCHI MK. ULTRASTRUCTURE OF LIGHT ORGANS OF LOLIGINID SQUIDS AND THEIR BACTERIAL SYMBIONTS: A NOVEL MODEL SYSTEM FOR THE STUDY OF MARINE SYMBIOSES. VIE ET MILIEU (PARIS, FRANCE : 1980) 2009; 59:307-313. [PMID: 21152248 PMCID: PMC2998345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The class Cephalopoda (Phylum Mollusca), encompassing squids and octopuses, contains multiple species that are characterized by the presence of specialized organs known to emit light. These complex organs have a variety of morphological characteristics ranging from groups of simple, light-producing cells, to highly specialized organs (light organs) with cells surrounded by reflectors, lenses, light guides, color filters, and muscles. Bacteriogenic light organs have been well characterized in sepiolid squids, but a number of species in the family Loliginidae are also known to contain bacteriogenic light organs. Interest in loliginid light organ structure has recently arisen because of their potential as ecological niches for Vibrio harveyi, a pathogenic marine bacterium. This also implies the importance of loliginid light organs as reservoirs for V. harveyi persistence in the ocean. The present study utilized transmission and scanning electron microscopy to characterize the morphology of loliginid light organs and determined the location of bacterial symbiont cells within the tissue. It was determined that the rod-shaped loliginid symbionts lack flagella, as similarly observed in other light organ-associated bacteria. Also, the interaction of individual cells to light organ tissue is not as defined as reported for other squid-Vibrio systems. In addition, SEM observations show the presence of two pores leading to the bacterial chamber. Data presented here offer support for the hypothesis of environmental transfer of bacterial symbionts in loliginid squids.
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Affiliation(s)
| | - M. K. NISHIGUCHI
- Department of Biology, New Mexico State University, Las Cruces, NM 88003-8001, USA
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