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Dittmann KK, Porsby CH, Goncalves P, Mateiu RV, Sonnenschein EC, Bentzon-Tilia M, Egan S, Gram L. Tropodithietic acid induces oxidative stress response, cell envelope biogenesis and iron uptake in Vibrio vulnificus. Environ Microbiol Rep 2019; 11:581-588. [PMID: 31102321 DOI: 10.1111/1758-2229.12771] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 05/14/2019] [Accepted: 05/15/2019] [Indexed: 06/09/2023]
Abstract
The Roseobacter group is a widespread marine bacterial group, of which some species produce the broad-spectrum antibiotic tropodithietic acid (TDA). A mode of action for TDA has previously been proposed in Escherichia coli, but little is known about its effect on non-producing marine bacteria at in situ concentrations. The purpose of this study was to investigate how a sub-lethal level of TDA affects Vibrio vulnificus at different time points (30 and 60 min) using a transcriptomic approach. Exposure to TDA for as little as 30 min resulted in the differential expression of genes associated with cell regeneration, including the up-regulation of those involved in biogenesis of the cell envelope. Defence mechanisms including oxidative stress defence proteins and iron uptake systems were also up-regulated in response to TDA, while motility-related genes were down-regulated. Gene expression data and scanning electron microscopy imaging revealed a switch to a biofilm phenotype in the presence of TDA. Our study shows that a low concentration of this antibiotic triggers a defence response to reactive oxygen species and iron depletion in V. vulnificus, which indicates that the mode of action of TDA is likely more complex in this bacterium than what is known for E. coli.
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Affiliation(s)
- Karen K Dittmann
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark
- School of Biological, Earth and Environmental Sciences, The University of New South Wales, Randwick, NSW, 2052, Australia
| | - Cisse H Porsby
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark
| | - Priscila Goncalves
- School of Biological, Earth and Environmental Sciences, The University of New South Wales, Randwick, NSW, 2052, Australia
| | - Ramona Valentina Mateiu
- Center for Electron Nanoscopy, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark
| | - Eva C Sonnenschein
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark
| | - Mikkel Bentzon-Tilia
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark
| | - Suhelen Egan
- School of Biological, Earth and Environmental Sciences, The University of New South Wales, Randwick, NSW, 2052, Australia
| | - Lone Gram
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark
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Dittmann KK, Sonnenschein EC, Egan S, Gram L, Bentzon-Tilia M. Impact of Phaeobacter inhibens on marine eukaryote-associated microbial communities. Environ Microbiol Rep 2019; 11:401-413. [PMID: 30277320 DOI: 10.1111/1758-2229.12698] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 09/25/2018] [Indexed: 06/08/2023]
Abstract
Bacteria-host interactions are universal in nature and have significant effects on host functionality. Bacterial secondary metabolites are believed to play key roles in such interactions as well as in interactions within the host-associated microbial community. Hence, prominent secondary metabolite-producing bacteria may be strong drivers of microbial community composition in natural host-associated microbiomes. This has, however, not been rigorously tested, and the purpose of this study was to investigate how the secondary metabolite producer Phaeobacter inhibens affects the diversity and composition of microbiomes associated with the microalga Emiliania huxleyi and the European flat oyster, Ostrea edulis. Roseobacters were indigenous to both communities exhibiting relative abundances between 2.8% and 7.0%. Addition of P. inhibens caused substantial changes in the overall structure of the low-complexity microbiome of E. huxleyi, but did not shape microbial community structure to the same degree in the more complex oyster microbiomes. Species-specific interactions occurred in both microbiomes and specifically the abundances of other putative secondary metabolite-producers such as vibrios and pseudoalteromonads were reduced. Thus, the impact of a bioactive strain like P. inhibens on host-associated microbiomes depends on the complexity and composition of the existing microbiome.
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Affiliation(s)
- Karen K Dittmann
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Copenhagen, Denmark
| | - Eva C Sonnenschein
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Copenhagen, Denmark
| | - Suhelen Egan
- School of Biological, Earth and Environmental Sciences, The University of New South Wales, Randwick, NSW, Australia
| | - Lone Gram
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Copenhagen, Denmark
| | - Mikkel Bentzon-Tilia
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Copenhagen, Denmark
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Affiliation(s)
- Karen K Dittmann
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Bastian B Rasmussen
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, Denmark
| | | | - Lone Gram
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Mikkel Bentzon-Tilia
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kgs. Lyngby, Denmark
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Dittmann KK, Chaul LT, Lee SHI, Corassin CH, Fernandes de Oliveira CA, Pereira De Martinis EC, Alves VF, Gram L, Oxaran V. Staphylococcus aureus in Some Brazilian Dairy Industries: Changes of Contamination and Diversity. Front Microbiol 2017; 8:2049. [PMID: 29123505 PMCID: PMC5662873 DOI: 10.3389/fmicb.2017.02049] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 10/06/2017] [Indexed: 12/17/2022] Open
Abstract
Staphylococcus aureus, a major food-poisoning pathogen, is a common contaminant in dairy industries worldwide, including in Brazil. We determined the occurrence of S. aureus in five dairies in Brazil over 8 months. Of 421 samples, 31 (7.4%) were positive for S. aureus and prevalence varied from 0 to 63.3% between dairies. Sixty-six isolates from the 31 samples were typed by Multi-Locus Sequence Typing to determine if these isolates were persistent or continuously reintroduced. Seven known sequence types (STs), ST1, ST5, ST30, ST97, ST126, ST188 and ST398, and four new ST were identified, ST3531, ST3540, ST3562 and ST3534. Clonal complex (CC) 1 (including the four new ST), known as an epidemic clone, was the dominant CC. However, there were no indications of persistence of particular ST. The resistance toward 11 antibiotic compounds was assessed. Twelve profiles were generated with 75.8% of strains being sensitive to all antibiotic classes and no Methicillin-resistant S. aureus (MRSA) strains were found. The enterotoxin-encoding genes involved in food-poisoning, e.g., sea, sed, see, and seg were targeted by PCR. The two toxin-encoding genes, sed and see, were not detected. Only three strains (4.5%) harbored seg and two of these also harbored sea. Despite the isolates being Methicillin-sensitive S. aureus (MSSA), the presence of CC1 clones in the processing environment, including some harboring enterotoxin encoding genes, is of concern and hygiene must have high priority to reduce contamination.
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Affiliation(s)
- Karen K. Dittmann
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Luíza T. Chaul
- Faculty of Pharmacy, Federal University of Goiás, Goiânia, Brazil
| | - Sarah H. I. Lee
- Faculty of Animal Science and Food Engineering, University of São Paulo, Ribeirão Preto, Brazil
| | - Carlos H. Corassin
- Faculty of Animal Science and Food Engineering, University of São Paulo, Ribeirão Preto, Brazil
| | | | | | | | - Lone Gram
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Virginie Oxaran
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark
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Hendriksen RS, Leekitcharoenphon P, Lukjancenko O, Lukwesa-Musyani C, Tambatamba B, Mwaba J, Kalonda A, Nakazwe R, Kwenda G, Jensen JD, Svendsen CA, Dittmann KK, Kaas RS, Cavaco LM, Aarestrup FM, Hasman H, Mwansa JCL. Genomic signature of multidrug-resistant Salmonella enterica serovar typhi isolates related to a massive outbreak in Zambia between 2010 and 2012. J Clin Microbiol 2015; 53:262-72. [PMID: 25392358 PMCID: PMC4290967 DOI: 10.1128/jcm.02026-14] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 11/03/2014] [Indexed: 01/22/2023] Open
Abstract
Retrospectively, we investigated the epidemiology of a massive Salmonella enterica serovar Typhi outbreak in Zambia during 2010 to 2012. Ninety-four isolates were susceptibility tested by MIC determinations. Whole-genome sequence typing (WGST) of 33 isolates and bioinformatic analysis identified the multilocus sequence type (MLST), haplotype, plasmid replicon, antimicrobial resistance genes, and genetic relatedness by single nucleotide polymorphism (SNP) analysis and genomic deletions. The outbreak affected 2,040 patients, with a fatality rate of 0.5%. Most (83.0%) isolates were multidrug resistant (MDR). The isolates belonged to MLST ST1 and a new variant of the haplotype, H58B. Most isolates contained a chromosomally translocated region containing seven antimicrobial resistance genes, catA1, blaTEM-1, dfrA7, sul1, sul2, strA, and strB, and fragments of the incompatibility group Q1 (IncQ1) plasmid replicon, the class 1 integron, and the mer operon. The genomic analysis revealed 415 SNP differences overall and 35 deletions among 33 of the isolates subjected to whole-genome sequencing. In comparison with other genomes of H58, the Zambian isolates separated from genomes from Central Africa and India by 34 and 52 SNPs, respectively. The phylogenetic analysis indicates that 32 of the 33 isolates sequenced belonged to a tight clonal group distinct from other H58 genomes included in the study. The small numbers of SNPs identified within this group are consistent with the short-term transmission that can be expected over a period of 2 years. The phylogenetic analysis and deletions suggest that a single MDR clone was responsible for the outbreak, during which occasional other S. Typhi lineages, including sensitive ones, continued to cocirculate. The common view is that the emerging global S. Typhi haplotype, H58B, containing the MDR IncHI1 plasmid is responsible for the majority of typhoid infections in Asia and sub-Saharan Africa; we found that a new variant of the haplotype harboring a chromosomally translocated region containing the MDR islands of IncHI1 plasmid has emerged in Zambia. This could change the perception of the term "classical MDR typhoid" currently being solely associated with the IncHI1 plasmid. It might be more common than presently thought that S. Typhi haplotype H58B harbors the IncHI1 plasmid or a chromosomally translocated MDR region or both.
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MESH Headings
- Anti-Bacterial Agents/pharmacology
- Child
- Child, Preschool
- Chromosomes, Bacterial
- Conjugation, Genetic
- Disease Outbreaks
- Drug Resistance, Multiple, Bacterial
- Evolution, Molecular
- Female
- Gene Order
- Genes, Bacterial
- Genome, Bacterial
- Genomics
- Haplotypes
- History, 21st Century
- Humans
- Male
- Microbial Sensitivity Tests
- Molecular Sequence Data
- Multilocus Sequence Typing
- Mutation
- Phylogeny
- Plasmids
- Polymorphism, Single Nucleotide
- Salmonella typhi/classification
- Salmonella typhi/drug effects
- Salmonella typhi/genetics
- Sequence Deletion
- Translocation, Genetic
- Typhoid Fever/epidemiology
- Typhoid Fever/history
- Typhoid Fever/microbiology
- Zambia/epidemiology
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Affiliation(s)
- Rene S Hendriksen
- WHO Collaborating Centre for Antimicrobial Resistance in Foodborne Pathogens and European Union Reference Laboratory for Antimicrobial Resistance, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Pimlapas Leekitcharoenphon
- WHO Collaborating Centre for Antimicrobial Resistance in Foodborne Pathogens and European Union Reference Laboratory for Antimicrobial Resistance, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Oksana Lukjancenko
- WHO Collaborating Centre for Antimicrobial Resistance in Foodborne Pathogens and European Union Reference Laboratory for Antimicrobial Resistance, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | | | | | - John Mwaba
- Department of Pathology and Microbiology, University Teaching Hospital, Lusaka, Zambia
| | - Annie Kalonda
- Department of Biomedical Sciences, School of Medicine, University of Zambia, Lusaka, Zambia
| | - Ruth Nakazwe
- Department of Pathology and Microbiology, University Teaching Hospital, Lusaka, Zambia
| | - Geoffrey Kwenda
- Department of Biomedical Sciences, School of Medicine, University of Zambia, Lusaka, Zambia
| | - Jacob Dyring Jensen
- WHO Collaborating Centre for Antimicrobial Resistance in Foodborne Pathogens and European Union Reference Laboratory for Antimicrobial Resistance, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Christina A Svendsen
- WHO Collaborating Centre for Antimicrobial Resistance in Foodborne Pathogens and European Union Reference Laboratory for Antimicrobial Resistance, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Karen K Dittmann
- WHO Collaborating Centre for Antimicrobial Resistance in Foodborne Pathogens and European Union Reference Laboratory for Antimicrobial Resistance, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Rolf S Kaas
- WHO Collaborating Centre for Antimicrobial Resistance in Foodborne Pathogens and European Union Reference Laboratory for Antimicrobial Resistance, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Lina M Cavaco
- WHO Collaborating Centre for Antimicrobial Resistance in Foodborne Pathogens and European Union Reference Laboratory for Antimicrobial Resistance, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Frank M Aarestrup
- WHO Collaborating Centre for Antimicrobial Resistance in Foodborne Pathogens and European Union Reference Laboratory for Antimicrobial Resistance, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Henrik Hasman
- WHO Collaborating Centre for Antimicrobial Resistance in Foodborne Pathogens and European Union Reference Laboratory for Antimicrobial Resistance, National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark
| | - James C L Mwansa
- Department of Pathology and Microbiology, University Teaching Hospital, Lusaka, Zambia
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