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Genomic characterisation of clinical and environmental Pseudomonas putida group strains and determination of their role in the transfer of antimicrobial resistance genes to Pseudomonas aeruginosa

Pseudomonas putida is a Gram-negative, non-fermenting bacterium frequently encountered in various environmental niches. P. putida rarely causes disease in humans, though serious infections and outbreaks have been reported from time to time. Some have suggested that P. putida functions as an exchange...

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Published in:BMC genomics 2017-11, Vol.18 (1), p.859-859, Article 859
Main Authors: Peter, Silke, Oberhettinger, Philipp, Schuele, Leonard, Dinkelacker, Ariane, Vogel, Wichard, Dörfel, Daniela, Bezdan, Daniela, Ossowski, Stephan, Marschal, Matthias, Liese, Jan, Willmann, Matthias
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container_title BMC genomics
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creator Peter, Silke
Oberhettinger, Philipp
Schuele, Leonard
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Vogel, Wichard
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Bezdan, Daniela
Ossowski, Stephan
Marschal, Matthias
Liese, Jan
Willmann, Matthias
description Pseudomonas putida is a Gram-negative, non-fermenting bacterium frequently encountered in various environmental niches. P. putida rarely causes disease in humans, though serious infections and outbreaks have been reported from time to time. Some have suggested that P. putida functions as an exchange platform for antibiotic resistance genes (ARG), and thus represents a serious concern in the spread of ARGs to more pathogenic organisms within a hospital. Though poorly understood, the frequency of ARG exchange between P. putida and the more virulent Pseudomonas aeruginosa and its clinical relevance are particularly important for designing efficient infection control strategies, such as deciding whether high-risk patients colonized with a multidrug resistant but typically low pathogenic P. putida strain should be contact isolated or not. In this study, 21,373 screening samples (stool, rectal and throat swab) were examined to determine the presence of P. putida in a high-risk group of haemato-oncology patients during a 28-month period. A total of 89 P. putida group strains were isolated from 85 patients, with 41 of 89 (46.1%) strains harbouring the metallo-beta-lactamase gene bla . These 41 clinical isolates, plus 18 bla positive environmental P. putida isolates, and 17 bla positive P. aeruginosa isolates, were characterized by whole genome sequencing (WGS). We constructed a maximum-likelihood tree to separate the 59 bla positive P. putida group strains into eight distinct phylogenetic clusters. Bla was present in 6 clusters while bla was detected in 4 clusters. Five P. putida group strains contained both, bla and bla genes. In contrast, all P. aeruginosa strains belonged to a single genetic cluster and contained the same ARGs. Apart from bla and sul genes, no other ARGs were shared between P. aeruginosa and P. putida. Furthermore, the bla gene in P. aeruginosa was predicted to be only chromosomally located. These data provide evidence that no exchange of comprehensive ARG harbouring mobile genetic elements had occurred between P. aeruginosa and P. putida group strains during the study period, thus eliminating the need to implement enhanced infection control measures for high-risk patients colonized with a bla positiv P. putida group strains in our clinical setting.
doi_str_mv 10.1186/s12864-017-4216-2
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P. putida rarely causes disease in humans, though serious infections and outbreaks have been reported from time to time. Some have suggested that P. putida functions as an exchange platform for antibiotic resistance genes (ARG), and thus represents a serious concern in the spread of ARGs to more pathogenic organisms within a hospital. Though poorly understood, the frequency of ARG exchange between P. putida and the more virulent Pseudomonas aeruginosa and its clinical relevance are particularly important for designing efficient infection control strategies, such as deciding whether high-risk patients colonized with a multidrug resistant but typically low pathogenic P. putida strain should be contact isolated or not. In this study, 21,373 screening samples (stool, rectal and throat swab) were examined to determine the presence of P. putida in a high-risk group of haemato-oncology patients during a 28-month period. A total of 89 P. putida group strains were isolated from 85 patients, with 41 of 89 (46.1%) strains harbouring the metallo-beta-lactamase gene bla . These 41 clinical isolates, plus 18 bla positive environmental P. putida isolates, and 17 bla positive P. aeruginosa isolates, were characterized by whole genome sequencing (WGS). We constructed a maximum-likelihood tree to separate the 59 bla positive P. putida group strains into eight distinct phylogenetic clusters. Bla was present in 6 clusters while bla was detected in 4 clusters. Five P. putida group strains contained both, bla and bla genes. In contrast, all P. aeruginosa strains belonged to a single genetic cluster and contained the same ARGs. Apart from bla and sul genes, no other ARGs were shared between P. aeruginosa and P. putida. Furthermore, the bla gene in P. aeruginosa was predicted to be only chromosomally located. These data provide evidence that no exchange of comprehensive ARG harbouring mobile genetic elements had occurred between P. aeruginosa and P. putida group strains during the study period, thus eliminating the need to implement enhanced infection control measures for high-risk patients colonized with a bla positiv P. putida group strains in our clinical setting.</abstract><cop>England</cop><pub>BioMed Central Ltd</pub><pmid>29126393</pmid><doi>10.1186/s12864-017-4216-2</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0002-1355-3953</orcidid><oa>free_for_read</oa></addata></record>
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source Open Access: PubMed Central; ProQuest Publicly Available Content database
subjects Antibiotic resistance
Antibiotics
Antimicrobial agents
Antimicrobial resistance
Catheters
Clinical isolates
Clusters
Deoxyribonucleic acid
Disease control
DNA
DNA sequencing
Drug resistance
Drug resistance in microorganisms
Enzymes
Exchanging
Gene sequencing
Genes
Genomes
Genomics
Horizontal gene transfer
Infections
Medical screening
Metallo-β-lactamase
Metallography
Multidrug resistance
Nucleotide sequencing
Oncology
Patients
Phylogeny
Pseudomonas aeruginosa
Pseudomonas putida
Rectum
Risk groups
Risk management
Strains (organisms)
VIM
VIM gene
VIM-2 gene
Whole genome sequencing
β Lactamase
title Genomic characterisation of clinical and environmental Pseudomonas putida group strains and determination of their role in the transfer of antimicrobial resistance genes to Pseudomonas aeruginosa
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