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Mawla GD, Kamal SM, Cao LY, Purhonen P, Hebert H, Sauer RT, Baker TA, Römling U. The membrane-cytoplasmic linker defines activity of FtsH proteases in Pseudomonas aeruginosa clone C. J Biol Chem 2024; 300:105622. [PMID: 38176647 PMCID: PMC10850787 DOI: 10.1016/j.jbc.2023.105622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Revised: 12/22/2023] [Accepted: 12/27/2023] [Indexed: 01/06/2024] Open
Abstract
Pandemic Pseudomonas aeruginosa clone C strains encode two inner-membrane associated ATP-dependent FtsH proteases. PaftsH1 is located on the core genome and supports cell growth and intrinsic antibiotic resistance, whereas PaftsH2, a xenolog acquired through horizontal gene transfer from a distantly related species, is unable to functionally replace PaftsH1. We show that purified PaFtsH2 degrades fewer substrates than PaFtsH1. Replacing the 31-amino acid-extended linker region of PaFtsH2 spanning from the C-terminal end of the transmembrane helix-2 to the first seven highly divergent residues of the cytosolic AAA+ ATPase module with the corresponding region of PaFtsH1 improves hybrid-enzyme substrate processing in vitro and enables PaFtsH2 to substitute for PaFtsH1 in vivo. Electron microscopy indicates that the identity of this linker sequence influences FtsH flexibility. We find membrane-cytoplasmic (MC) linker regions of PaFtsH1 characteristically glycine-rich compared to those from FtsH2. Consequently, introducing three glycines into the membrane-proximal end of PaFtsH2's MC linker is sufficient to elevate its activity in vitro and in vivo. Our findings establish that the efficiency of substrate processing by the two PaFtsH isoforms depends on MC linker identity and suggest that greater linker flexibility and/or length allows FtsH to degrade a wider spectrum of substrates. As PaFtsH2 homologs occur across bacterial phyla, we hypothesize that FtsH2 is a latent enzyme but may recognize specific substrates or is activated in specific contexts or biological niches. The identity of such linkers might thus play a more determinative role in the functionality of and physiological impact by FtsH proteases than previously thought.
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Affiliation(s)
- Gina D Mawla
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Shady M Kamal
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm; Sweden
| | - Lian-Ying Cao
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm; Sweden
| | - Pasi Purhonen
- Department of Biomedical Engineering and Health Systems, KTH Royal Institute of Technology, Huddinge; Sweden
| | - Hans Hebert
- Department of Biomedical Engineering and Health Systems, KTH Royal Institute of Technology, Huddinge; Sweden
| | - Robert T Sauer
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Tania A Baker
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
| | - Ute Römling
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm; Sweden.
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Klockgether J, Pust MM, Davenport CF, Bunk B, Spröer C, Overmann J, Tümmler B. Structural genome variants of Pseudomonas aeruginosa clone C and PA14 strains. Front Microbiol 2023; 14:1095928. [PMID: 36992927 PMCID: PMC10040652 DOI: 10.3389/fmicb.2023.1095928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 02/20/2023] [Indexed: 03/16/2023] Open
Abstract
Plasticity of Pseudomonas aeruginosa chromosomes is mainly driven by an extended accessory genome that is shaped by insertion and deletion events. Further modification of the genome composition can be induced by chromosomal inversion events which lead to relocation of genes in the affected genomic DNA segments, modify the otherwise highly conserved core genome synteny and could even alter the location of the replication terminus. Although the genome of the first sequenced strain, PAO1, displayed such a large genomic inversion, knowledge on such recombination events in the P. aeruginosa population is limited. Several large inversions had been discovered in the late 1990s in cystic fibrosis isolates of the major clonal lineage C by physical genome mapping, and subsequent work on these examples led to the characterization of the DNA at the recombination breakpoints and a presumed recombination mechanism. Since then, the topic was barely addressed in spite of the compilation of thousands of P. aeruginosa genome sequences that are deposited in databases. Due to the use of second-generation sequencing, genome contig assembly had usually followed synteny blueprints provided by the existing reference genome sequences. Inversion detection was not feasible by these approaches, as the respective read lengths did not allow reliable resolution of sequence repeats that are typically found at the borders of inverted segments. In this study, we applied PacBio and MinION long-read sequencing to isolates of the mentioned clone C collection. Confirmation of inversions predicted from the physical mapping data demonstrated that unbiased sequence assembly of such read datasets allows the detection of genomic inversions and the resolution of the recombination breakpoint regions. Additional long-read sequencing of representatives of the other major clonal lineage, PA14, revealed large inversions in several isolates, from cystic fibrosis origin as well as from other sources. These findings indicated that inversion events are not restricted to strains from chronic infection background, but could be widespread in the P. aeruginosa population and contribute to genome plasticity. Moreover, the monitored examples emphasized the role of small mobile DNA units, such as IS elements or transposons, and accessory DNA elements in the inversion-related recombination processes.
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Affiliation(s)
- Jens Klockgether
- Department of Pediatric Pneumology, Allergology and Neonatology, Hannover Medical School, Hanover, Germany
- *Correspondence: Jens Klockgether,
| | - Marie-Madlen Pust
- Department of Pediatric Pneumology, Allergology and Neonatology, Hannover Medical School, Hanover, Germany
| | - Colin F. Davenport
- Department of Pediatric Pneumology, Allergology and Neonatology, Hannover Medical School, Hanover, Germany
| | - Boyke Bunk
- Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
| | - Cathrin Spröer
- Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
| | - Jörg Overmann
- Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
- German Center for Infection Research, Partner Site Hannover-Braunschweig, Braunschweig, Germany
| | - Burkhard Tümmler
- Department of Pediatric Pneumology, Allergology and Neonatology, Hannover Medical School, Hanover, Germany
- German Center for Lung Research, Biomedical Research in Endstage and Obstructive Lung Disease (BREATH), Hannover Medical School, Hanover, Germany
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Rapid Identification of Pseudomonas aeruginosa International High-Risk Clones Based on High-Resolution Melting Analysis. Microbiol Spectr 2023; 11:e0357122. [PMID: 36629420 PMCID: PMC9927482 DOI: 10.1128/spectrum.03571-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The Pseudomonas aeruginosa population has a nonclonal epidemic structure. It is generally composed of a limited number of widespread clones selected from a background of many rare and unrelated genotypes recombining at high frequency. Due to the increasing prevalence of nosocomial infections caused by multidrug-resistant/extensively drug-resistant (MDR/XDR) strains, it is advisable to implement infection control measures. Pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) are considered the gold standard methods in bacterial typing, despite being limited by cost, staff, and instrumental demands. Here, we present a novel mini-MLST scheme for P. aeruginosa rapid genotyping based on high-resolution melting analysis. Using the proposed mini-MLST scheme, 3,955 existing sequence types (STs) were converted into 701 melting types (MelTs), resulting in a discriminatory power of D = 0.993 (95% confidence interval [CI], 0.992 to 0.994). Whole-genome sequencing of 18 clinical isolates was performed to support the newly designed mini-MLST scheme. The clonal analysis of STs belonging to MelTs associated with international high-risk clones (HRCs) performed by goeBURST software revealed that a high proportion of the included STs are highly related to HRCs and have also been witnessed as responsible for serious infections. Therefore, mini-MLST provides a clear warning for the potential spread of P. aeruginosa clones recognized as MDR/XDR strains with possible serious outcomes. IMPORTANCE In this study, we designed a novel mini-MLST typing scheme for Pseudomonas aeruginosa. Its great discriminatory power, together with ease of performance and short processing time, makes this approach attractive for prospective typing of large isolate sets. Integrating the novel P. aeruginosa molecular typing scheme enables the development and spread of MDR/XDR high-risk clones to be investigated.
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Optimization of Transposon Mutagenesis Methods in Pseudomonas antarctica. Microorganisms 2023; 11:microorganisms11010118. [PMID: 36677410 PMCID: PMC9864612 DOI: 10.3390/microorganisms11010118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Accepted: 12/14/2022] [Indexed: 01/04/2023] Open
Abstract
Pseudomonas is a widespread genus in various host and environmental niches. Pseudomonas exists even in extremely cold environments such as Antarctica. Pseudomonas antarctica is a psychrophilic bacterium isolated from Antarctica. P. antarctica is also known to produce antimicrobial substances. Although P. antarctica can provide insight into how bacteria have adapted to low temperatures and has significant potential for developing novel antimicrobial substances, progress in genetic and molecular studies has not been achieved. Transposon mutagenesis is a useful tool to screen genes of interest in bacteria. Therefore, we attempted for the first time in P. antarctica to generate transposon insertion mutants using the transfer of a conjugational plasmid encoding a transposon. To increase the yield of transposon insertion mutants, we optimized the methods, in terms of temperature for conjugation, the ratio of donor and recipient during conjugation, and the concentration of antibiotics. Here, we describe the optimized methods to successfully generate transposon insertion mutants in P. antarctica.
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Armbruster CR, Li K, Kiedrowski MR, Zemke AC, Melvin JA, Moore J, Atteih S, Fitch AC, DuPont M, Manko CD, Weaver ML, Gaston JR, Alcorn JF, Morris A, Methé BA, Lee SE, Bomberger JM. Low Diversity and Instability of the Sinus Microbiota over Time in Adults with Cystic Fibrosis. Microbiol Spectr 2022; 10:e0125122. [PMID: 36094193 PMCID: PMC9603634 DOI: 10.1128/spectrum.01251-22] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 08/10/2022] [Indexed: 12/30/2022] Open
Abstract
Chronic rhinosinusitis (CRS) is a common, yet underreported and understudied manifestation of upper respiratory disease in people with cystic fibrosis (CF). Recently developed standard of care guidelines for the management of CF CRS suggest treatment of upper airway disease may ameliorate lower airway disease. We sought to determine whether changes to sinus microbial community diversity and specific taxa known to cause CF lung disease are associated with increased respiratory disease and inflammation. We performed 16S rRNA gene sequencing, supplemented with cytokine analyses, microscopy, and bacterial culturing, on samples from the sinuses of 27 adults with CF CRS. At each study visit, participants underwent endoscopic paranasal sinus sampling and clinical evaluation. We identified key drivers of microbial community composition and evaluated relationships between diversity and taxa with disease outcomes and inflammation. Sinus community diversity was low, and the composition was unstable, with many participants exhibiting alternating dominance between Pseudomonas aeruginosa and staphylococci over time. Despite a tendency for dominance by these two taxa, communities were highly individualized and shifted composition during exacerbation of sinus disease symptoms. Exacerbations were also associated with communities dominated by Staphylococcus spp. Reduced microbial community diversity was linked to worse sinus disease and the inflammatory status of the sinuses (including increased interleukin-1β [IL-1β]). Increased IL-1β was also linked to worse sinus endoscopic appearance, and other cytokines were linked to microbial community dynamics. Our work revealed previously unknown instability of sinus microbial communities and a link between inflammation, lack of microbial community diversity, and worse sinus disease. IMPORTANCE Together with prior sinus microbiota studies of adults with CF chronic rhinosinusitis, our study underscores similarities between sinus and lower respiratory tract microbial community structures in CF. We show how community structure tracks with inflammation and several disease measures. This work strongly suggests that clinical management of CRS could be leveraged to improve overall respiratory health in CF. Our work implicates elevated IL-1β in reduced microbiota diversity and worse sinus disease in CF CRS, suggesting applications for existing therapies targeting IL-1β. Finally, the widespread use of highly effective cystic fibrosis transmembrane conductance regulator (CFTR) modulator therapy has led to less frequent availability of spontaneous expectorated sputum for microbiological surveillance of lung infections. A better understanding of CF sinus microbiology could provide a much-needed alternative site for monitoring respiratory infection status by important CF pathogens.
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Affiliation(s)
- Catherine R. Armbruster
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Kelvin Li
- Center for Medicine and the Microbiome, University of Pittsburgh and University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Megan R. Kiedrowski
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Anna C. Zemke
- Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Jeffrey A. Melvin
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - John Moore
- Department of Otolaryngology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Samar Atteih
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Adam C. Fitch
- Center for Medicine and the Microbiome, University of Pittsburgh and University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Matthew DuPont
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Christopher D. Manko
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Madison L. Weaver
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Jordon R. Gaston
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - John F. Alcorn
- Department of Pediatrics, Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Alison Morris
- Center for Medicine and the Microbiome, University of Pittsburgh and University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Barbara A. Methé
- Center for Medicine and the Microbiome, University of Pittsburgh and University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Stella E. Lee
- Department of Otolaryngology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Jennifer M. Bomberger
- Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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Shahri FN, Izanloo A, Goharrizi MASB, Jamali A, Bagheri H, Hjimohammadi A, Ardebili A. Antimicrobial resistance, virulence factors, and genotypes of Pseudomonas aeruginosa clinical isolates from Gorgan, northern Iran. Int Microbiol 2022; 25:709-721. [PMID: 35697891 DOI: 10.1007/s10123-022-00256-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 05/23/2022] [Accepted: 05/31/2022] [Indexed: 11/24/2022]
Abstract
Pseudomonas aeruginosa is an important nosocomial pathogen with a capacity of resistance to multiple antibiotics and production of various extracellular and cell-associated virulence factors that clearly contribute to its pathogenicity. The objective of this study was to investigate the antibiotic susceptibility, virulence factors, and clonal relationship among clinical isolates of P. aeruginosa. Different clinical specimens from hospitalized patients were investigated for P. aeruginosa. Susceptibility of the isolates was evaluated by disc diffusion and broth microdilution methods, as described by the Clinical and Laboratory Standards Institute (CLSI) guideline. A total of 97 P. aeruginosa isolates were recovered from clinical specimens. The percentage of isolates resistant to antimicrobials was imipenem 25.77%, meropenem 15.46%, gentamicin 16.49%, tobramycin 15.46%, amikacin 16.49%, ciprofloxacin 20.61%, levofloxacin 24.74, ceftazidime 20.61%, piperacillin 15.46%, piperacillin/tazobactam 12.37%, colistin 9.27%, and polymyxin B 11.34%. Of isolates, 87.62% possessed β-hemolytic activity, 78.35% lecithinase, 59.8% elastase, 37.11% DNase, and 28.86% twitching motility. The frequency of virulence genes in isolates was lasB 82.47%, plcH 82.47%, exoA 58.76%, exoS 56.7%, and pilA 10.3%. ERIC-PCR typing clustered P. aeruginosa isolates to 19 common types (CT1-CT19) containing isolates from different hospitals and 43 single types (ST1-ST43). Colistin and polymyxin B were the most effective agents against the majority of P. aeruginosa isolates, emphasizing the effort to maintain their antibacterial activity as last-line therapy. The frequency of some virulence factors and genes was noticeably high, which is alarming. In addition, more effective strategies and surveillance are necessary to confine and prevent the inter-hospital and/or intra-hospital dissemination of P. aeruginosa between therapeutic centers.
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Affiliation(s)
- Fatemeh Nemati Shahri
- Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Iran.,Department of Microbiology, Faculty of Medicine, Golestan University of Medical Sciences, P.O. Box: 4934174515, Gorgan, Iran
| | - Ahdieh Izanloo
- Department of Biology, Faculty of Sciences, Golestan University, Gorgan, Iran
| | | | - Ailar Jamali
- Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Iran.,Department of Microbiology, Faculty of Medicine, Golestan University of Medical Sciences, P.O. Box: 4934174515, Gorgan, Iran
| | - Hanieh Bagheri
- Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Iran
| | - Afsaneh Hjimohammadi
- Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Iran
| | - Abdollah Ardebili
- Infectious Diseases Research Center, Golestan University of Medical Sciences, Gorgan, Iran. .,Department of Microbiology, Faculty of Medicine, Golestan University of Medical Sciences, P.O. Box: 4934174515, Gorgan, Iran.
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Identification of Key Factors for Anoxic Survival of B. cenocepacia H111. Int J Mol Sci 2022; 23:ijms23094560. [PMID: 35562951 PMCID: PMC9104464 DOI: 10.3390/ijms23094560] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 04/11/2022] [Accepted: 04/15/2022] [Indexed: 11/21/2022] Open
Abstract
Burkholderia cenocepacia is an opportunistic pathogen that can lead to severe infections in patients suffering from cystic fibrosis (CF) and chronic granulomatous disease. Being an obligate aerobe, B. cenocepacia is unable to grow in the absence of oxygen. In this study, we show that the CF isolate B. cenocepacia H111 can survive in the absence of oxygen. Using a transposon sequencing (Tn-seq) approach, we identified 71 fitness determinants involved in anoxic survival, including a Crp-Fnr family transcriptional regulatory gene (anr2), genes coding for the sensor kinase RoxS and its response regulator RoxR, the sigma factor for flagella biosynthesis (FliA) and subunits of a cytochrome bd oxidase (CydA, CydB and the potentially novel subunit CydP). Individual knockouts of these fitness determinants significantly reduced anoxic survival, and inactivation of both anr copies is shown to be lethal under anoxic conditions. We also show that the two-component system RoxS/RoxR and FliA are important for virulence and swarming/swimming, respectively.
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Lynch JP, Zhanel GG. Pseudomonas aeruginosa Pneumonia: Evolution of Antimicrobial Resistance and Implications for Therapy. Semin Respir Crit Care Med 2022; 43:191-218. [PMID: 35062038 DOI: 10.1055/s-0041-1740109] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Pseudomonas aeruginosa (PA), a non-lactose-fermenting gram-negative bacillus, is a common cause of nosocomial infections in critically ill or debilitated patients, particularly ventilator-associated pneumonia (VAP), and infections of urinary tract, intra-abdominal, wounds, skin/soft tissue, and bloodstream. PA rarely affects healthy individuals, but may cause serious infections in patients with chronic structural lung disease, comorbidities, advanced age, impaired immune defenses, or with medical devices (e.g., urinary or intravascular catheters, foreign bodies). Treatment of pseudomonal infections is difficult, as PA is intrinsically resistant to multiple antimicrobials, and may acquire new resistance determinants even while on antimicrobial therapy. Mortality associated with pseudomonal VAP or bacteremias is high (> 35%) and optimal therapy is controversial. Over the past three decades, antimicrobial resistance (AMR) among PA has escalated globally, via dissemination of several international multidrug resistant "epidemic" clones. We discuss the importance of PA as a cause of pneumonia including health care-associated pneumonia, hospital-acquired pneumonia, VAP, the emergence of AMR to this pathogen, and approaches to therapy (both empirical and definitive).
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Affiliation(s)
- Joseph P Lynch
- Division of Pulmonary, Critical Care Medicine, Allergy, and Clinical Immunology, Department of Medicine, The David Geffen School of Medicine at UCLA, Los Angeles, California
| | - George G Zhanel
- Department of Medical Microbiology/Infectious Diseases, University of Manitoba, Max Rady College of Medicine, Winnipeg, Manitoba, Canada
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Tümmler B. What Makes Pseudomonas aeruginosa a Pathogen? ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1386:283-301. [DOI: 10.1007/978-3-031-08491-1_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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10
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Abstract
The transcriptomes of Pseudomonas aeruginosa clone C isolates NN2 and SG17M during the mid-exponential and early stationary phase of planktonic growth were evaluated by direct RNA sequencing on the nanopore platform and compared with established short-read cDNA sequencing on the Illumina platform. Fifty to ninety percent of the sense RNAs turned out to be rRNA molecules followed by similar proportions of mRNA transcripts and non-coding RNAs. Both platforms detected similar proportions of uncharged tRNAs and 29 yet undescribed antisense tRNAs. For example, the rarest arginine codon was paired with the most abundant tRNAArg, and the tRNAArg gene is missing for the most frequent arginine codon. More than 90% of the antisense RNA molecules were complementary to a coding sequence. The antisense RNAs were evenly distributed in the genomes. Direct RNA sequencing identified more than 4,000 distinct non-overlapping antisense RNAs during exponential and stationary growth. Besides highly expressed small antisense RNAs less than 200 bases in size, a population of longer antisense RNAs was sequenced that covered a broad range of a few hundred to thousands of bases and could be complementary to a contig of several genes. In summary, direct RNA sequencing identified yet undescribed RNA molecules and an unexpected composition of the pools of tRNAs, sense and antisense RNAs. IMPORTANCE Genome-wide gene expression of bacteria is commonly studied by high-throughput sequencing of size-selected cDNA fragment libraries of reverse-transcribed RNA preparations. However, the depletion of ribosomal RNAs, enzymatic reverse transcription and the fragmentation, size selection and amplification during library preparation lead to inevitable losses of information about the initial composition of the RNA pool. We demonstrate that direct RNA sequencing on the nanopore platform can overcome these limitations. Nanopore sequencing of total RNA yielded novel insights into the Pseudomonas aeruginosa transcriptome that - if replicated in other species - will change our view of the bacterial RNA world. The discovery of sense - antisense pairs of tmRNA, tRNAs and mRNAs indicates a further and unknown level of gene regulation in bacteria.
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Differential Surface Competition and Biofilm Invasion Strategies of Pseudomonas aeruginosa PA14 and PAO1. J Bacteriol 2021; 203:e0026521. [PMID: 34516283 DOI: 10.1128/jb.00265-21] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Pseudomonas aeruginosa strains PA14 and PAO1 are among the two best-characterized model organisms used to study the mechanisms of biofilm formation while also representing two distinct lineages of P. aeruginosa. Previous work has shown that PA14 and PAO1 use different strategies for surface colonization; they also have different extracellular matrix composition and different propensities to disperse from biofilms back into the planktonic phase surrounding them. We expand on this work here by exploring the consequences of these different biofilm production strategies during direct competition. Using differentially labeled strains and microfluidic culture methods, we show that PAO1 can outcompete PA14 in direct competition during early colonization and subsequent biofilm growth, that they can do so in constant and perturbed environments, and that this advantage is specific to biofilm growth and requires production of the Psl polysaccharide. In contrast, P. aeruginosa PA14 is better able to invade preformed biofilms and is more inclined to remain surface-associated under starvation conditions. These data together suggest that while P. aeruginosa PAO1 and PA14 are both able to effectively colonize surfaces, they do so in different ways that are advantageous under different environmental settings. IMPORTANCE Recent studies indicate that P. aeruginosa PAO1 and PA14 use distinct strategies to initiate biofilm formation. We investigated whether their respective colonization and matrix secretion strategies impact their ability to compete under different biofilm-forming regimes. Our work shows that these different strategies do indeed impact how these strains fair in direct competition: PAO1 dominates during colonization of a naive surface, while PA14 is more effective in colonizing a preformed biofilm. These data suggest that even for very similar microbes there can be distinct strategies to successfully colonize and persist on surfaces during the biofilm life cycle.
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Yilmaz Yegit C, Ergenekon AP, Mursaloglu HH, Cenk M, Uzunoglu BS, Tastan G, Gokdemir Y, Erdem Eralp E, Karakoc F, Nasr SZ, Karadag B. The effects of nebulizer hygiene training on the practices of cystic fibrosis patients and caregivers. Pediatr Pulmonol 2021; 56:1527-1533. [PMID: 33538406 DOI: 10.1002/ppul.25307] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 01/26/2021] [Accepted: 01/30/2021] [Indexed: 11/06/2022]
Abstract
BACKGROUND Nebulizers can be contaminated with microorganisms and may be a source of infection in the lower airways in patients with cystic fibrosis (CF). OBJECTIVE Primary aim of this study was to determine the level of knowledge regarding nebulizer hygiene and adherence to CF foundation infection prevention and control (IPC) measures of CF patients in our center. We also evaluated the effect of a standardized training program on nebulizer cleaning and disinfection practises with pre and posttest. METHODS Caregivers of 173 CF patients followed at Marmara University CF Center filled a questionnaire (pretest) regarding nebulizer hygiene and received didactic education including pictures and videos based on the cystic fibrosis foundation (CFF) IPC guidelines, patients were also provided educational materials. Posttest was performed 1-3 months after the education session. RESULTS Following standardized training, usage of appropriate methods according to CFF IPC guidelines improved significantly. Frequency of nebulizer cleaning after each use increased from 58.4% to 78% (p < .01) and disinfection frequency after each/daily usage increased from 33.6% to 75.7% (p < .01). Additionally, methods of cleaning and storage of the nebulizer, also improved significantly (p < .01, p < .01). CONCLUSION Education was highly effective to increase the rate of proper practices for nebulizer hygiene. The necessity of cleaning, disinfection, careful drying, correct storage of the nebulizer parts, and changing the nebulizer equipment within recommended time should be emphasized to CF families regularly.
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Affiliation(s)
- Cansu Yilmaz Yegit
- Department of Pediatric Pulmonology, Marmara University School of Medicine, Istanbul, Turkey
| | - Almala Pinar Ergenekon
- Department of Pediatric Pulmonology, Marmara University School of Medicine, Istanbul, Turkey
| | - Huseyin Hakan Mursaloglu
- Department of Pediatic Pulmonology; Selim Coremen Cystic Fibrosis Center, Marmara University School of Medicine, Istanbul, Turkey
| | - Muruvvet Cenk
- Department of Pediatric Pulmonology, Marmara University School of Medicine, Istanbul, Turkey
| | - Burcu Suzer Uzunoglu
- Department of Pediatic Pulmonology; Selim Coremen Cystic Fibrosis Center, Marmara University School of Medicine, Istanbul, Turkey
| | - Gamze Tastan
- Department of Pediatic Pulmonology; Selim Coremen Cystic Fibrosis Center, Marmara University School of Medicine, Istanbul, Turkey
| | - Yasemin Gokdemir
- Department of Pediatric Pulmonology, Marmara University School of Medicine, Istanbul, Turkey
| | - Ela Erdem Eralp
- Department of Pediatric Pulmonology, Marmara University School of Medicine, Istanbul, Turkey
| | - Fazilet Karakoc
- Department of Pediatric Pulmonology, Marmara University School of Medicine, Istanbul, Turkey
| | - Samya Z Nasr
- Department of Pediatric Pulmonology, University of Michigan Health System, Ann Arbor, Michigan, USA
| | - Bulent Karadag
- Department of Pediatric Pulmonology, Marmara University School of Medicine, Istanbul, Turkey
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Lee C, Klockgether J, Fischer S, Trcek J, Tümmler B, Römling U. Why? - Successful Pseudomonas aeruginosa clones with a focus on clone C. FEMS Microbiol Rev 2021; 44:740-762. [PMID: 32990729 PMCID: PMC7685784 DOI: 10.1093/femsre/fuaa029] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 07/12/2020] [Indexed: 12/20/2022] Open
Abstract
The environmental species Pseudomonas aeruginosa thrives in a variety of habitats. Within the epidemic population structure of P. aeruginosa, occassionally highly successful clones that are equally capable to succeed in the environment and the human host arise. Framed by a highly conserved core genome, individual members of successful clones are characterized by a high variability in their accessory genome. The abundance of successful clones might be funded in specific features of the core genome or, although not mutually exclusive, in the variability of the accessory genome. In clone C, one of the most predominant clones, the plasmid pKLC102 and the PACGI-1 genomic island are two ubiquitous accessory genetic elements. The conserved transmissible locus of protein quality control (TLPQC) at the border of PACGI-1 is a unique horizontally transferred compository element, which codes predominantly for stress-related cargo gene products such as involved in protein homeostasis. As a hallmark, most TLPQC xenologues possess a core genome equivalent. With elevated temperature tolerance as a characteristic of clone C strains, the unique P. aeruginosa and clone C specific disaggregase ClpG is a major contributor to tolerance. As other successful clones, such as PA14, do not encode the TLPQC locus, ubiquitous denominators of success, if existing, need to be identified.
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Affiliation(s)
- Changhan Lee
- Department of Microbiology, Tumor and Cell Biology, Biomedicum C8, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Jens Klockgether
- Clinic for Paediatric Pneumology, Allergology and Neonatology, Clinical Research Group 'Pseudomonas Genomics', Hannover Medical School, D-30625 Hannover, Germany
| | - Sebastian Fischer
- Clinic for Paediatric Pneumology, Allergology and Neonatology, Clinical Research Group 'Pseudomonas Genomics', Hannover Medical School, D-30625 Hannover, Germany
| | - Janja Trcek
- Faculty of Natural Sciences and Mathematics, Department of Biology, University of Maribor, Maribor, 2000, Slovenia
| | - Burkhard Tümmler
- Clinic for Paediatric Pneumology, Allergology and Neonatology, Clinical Research Group 'Pseudomonas Genomics', Hannover Medical School, D-30625 Hannover, Germany
| | - Ute Römling
- Department of Microbiology, Tumor and Cell Biology, Biomedicum C8, Karolinska Institutet, SE-171 77 Stockholm, Sweden
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14
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Khan M, Willcox MDP, Rice SA, Sharma S, Stapleton F. Development of antibiotic resistance in the ocular Pseudomonas aeruginosa clone ST308 over twenty years. Exp Eye Res 2021; 205:108504. [PMID: 33610601 DOI: 10.1016/j.exer.2021.108504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 02/07/2021] [Accepted: 02/12/2021] [Indexed: 11/17/2022]
Abstract
Corneal infection caused by a bacteria Pseudomonas aeruginosa is common cause of ocular morbidity. Increasing antibiotic resistance by ocular P. aeruginosa is an emerging concern. In this study the resistome of ocular isolates of Pseudomonas aeruginosa clone ST308 isolated in India in 1997 (PA31, PA32, PA33, PA35 and PA37) and 2018 (PA198 and PA219) were investigated. All the isolates of ST308 had >95% nucleotide similarity. The isolates from 2018 had larger genomes, coding sequences, accessory and pan genes compared to the older isolates from 1997. The 2018 isolate PA219 was resistant to all antibiotics except polymyxin B, while the 2018 isolate PA198 was resistant to ciprofloxacin, levofloxacin, gentamicin and tobramycin. Among the isolates from 1997, five were resistant to gentamicin, tobramycin and ciprofloxacin, four were resistant to levofloxacin while two were resistant to polymyxin B. Twenty-four acquired resistance genes were present in the 2018 isolates compared to 11 in the historical isolates. All isolates contained genes encoding for aminoglycoside (aph(6)-Id, aph(3')-lIb, aph(3″)-Ib), beta-lactam (blaPAO), tetracycline (tet(G)), fosfomycin (fosA), chloramphenicol (catB7), sulphonamide (sul1), quaternary ammonium (qacEdelta1) and fluoroquinolone (crpP) resistance. Isolate PA198 possessed aph(3')-VI, rmtD2, qnrVC1, blaOXA-488, blaPME-1, while PA219 possessed aadA1, rmtB, qnrVC1, aac(6')-Ib-cr, blaTEM-1B, blaVIM-2, blaPAO-1, mph(E), mph(A), msr(E). In both recent isolates qnrVC1 was present in Tn3 transposon. In 219 blaTEM-1 was carried on a transposon and blaOXA-10 on a class 1 integron. There were no notable differences in the number of single nucleotide polymorphisms, but recent isolates carried more insertions and deletions in their genes. These findings suggest that genomes of P. aeruginosa ocular clonal strains with >95% nucleotide identity isolated twenty years apart had changed over time with the acquisition of resistance genes. The pattern of gene mutations also varied with more insertions and deletions in their chromosomal genes which confer resistance to antibiotics.
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Affiliation(s)
- Mahjabeen Khan
- School of Optometry and Vision Science, UNSW, Sydney, Australia.
| | - Mark D P Willcox
- School of Optometry and Vision Science, UNSW, Sydney, Australia.
| | - Scott A Rice
- The Singapore Centre for Environment Life Sciences Engineering (SCELSE), The School of Biological Sciences, Nanyang Technological University Singapore and the Ithree Institute, The University of Technology Sydney, Sydney, Australia.
| | | | - Fiona Stapleton
- School of Optometry and Vision Science, UNSW, Sydney, Australia.
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15
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Moyne O, Castelli F, Bicout DJ, Boccard J, Camara B, Cournoyer B, Faudry E, Terrier S, Hannani D, Huot-Marchand S, Léger C, Maurin M, Ngo TD, Plazy C, Quinn RA, Attree I, Fenaille F, Toussaint B, Le Gouëllec A. Metabotypes of Pseudomonas aeruginosa Correlate with Antibiotic Resistance, Virulence and Clinical Outcome in Cystic Fibrosis Chronic Infections. Metabolites 2021; 11:metabo11020063. [PMID: 33494144 PMCID: PMC7909822 DOI: 10.3390/metabo11020063] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/14/2021] [Accepted: 01/15/2021] [Indexed: 02/07/2023] Open
Abstract
Pseudomonas aeruginosa (P.a) is one of the most critical antibiotic resistant bacteria in the world and is the most prevalent pathogen in cystic fibrosis (CF), causing chronic lung infections that are considered one of the major causes of mortality in CF patients. Although several studies have contributed to understanding P.a within-host adaptive evolution at a genomic level, it is still difficult to establish direct relationships between the observed mutations, expression of clinically relevant phenotypes, and clinical outcomes. Here, we performed a comparative untargeted LC/HRMS-based metabolomics analysis of sequential isolates from chronically infected CF patients to obtain a functional view of P.a adaptation. Metabolic profiles were integrated with expression of bacterial phenotypes and clinical measurements following multiscale analysis methods. Our results highlighted significant associations between P.a “metabotypes”, expression of antibiotic resistance and virulence phenotypes, and frequency of clinical exacerbations, thus identifying promising biomarkers and therapeutic targets for difficult-to-treat P.a infections
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Affiliation(s)
- Oriane Moyne
- Département de Biochimie, Faculté de médecine de Grenoble, CNRS, CHU Grenoble Alpes, University Grenoble Alpes, Grenoble INP*, TIMC-IMAG, 38000 Grenoble, France; (O.M.); (D.J.B.); (D.H.); (S.H.-M.); (C.L.); (M.M.); (C.P.); (B.T.)
| | - Florence Castelli
- Département Médicaments et Technologies pour la Santé (DMTS), University Paris-Saclay, CEA, INRAE, MetaboHUB, 91191 Gif sur Yvette, France; (F.C.); (S.T.); (F.F.)
| | - Dominique J. Bicout
- Département de Biochimie, Faculté de médecine de Grenoble, CNRS, CHU Grenoble Alpes, University Grenoble Alpes, Grenoble INP*, TIMC-IMAG, 38000 Grenoble, France; (O.M.); (D.J.B.); (D.H.); (S.H.-M.); (C.L.); (M.M.); (C.P.); (B.T.)
- Biomathematics and Epidemiology EPSP-TIMC, Veterinary Campus of Lyon, VetAgro Sup, 69280 Marcy l’Etoile, France
- Laue-Langevin Institute, Theory Group, 71 Avenue des Martyrs, 38042 Grenoble, France
| | - Julien Boccard
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211 Geneva, Switzerland;
| | - Boubou Camara
- CHU Grenoble Alpes, Service Hospitalier Universitaire de Pneumologie, Centre de Compétence de la Mucoviscidose, 38000 Grenoble, France;
| | - Benoit Cournoyer
- Department of Veterinary and biological sciences, Université Claude Bernard Lyon 1, University Lyon 1, VetAgro Sup, UMR Ecologie Microbienne, CNRS 5557, INRA 1418, 69280 Marcy L’Etoile, France;
| | - Eric Faudry
- CEA, INSERM, CNRS, Bacterial Pathogenesis and Cellular Responses, University Grenoble Alpes, UMR 1036/ERL 5261, 17 avenue des Martyrs, 38054 Grenoble, France; (E.F.); (T.-D.N.); (I.A.)
| | - Samuel Terrier
- Département Médicaments et Technologies pour la Santé (DMTS), University Paris-Saclay, CEA, INRAE, MetaboHUB, 91191 Gif sur Yvette, France; (F.C.); (S.T.); (F.F.)
| | - Dalil Hannani
- Département de Biochimie, Faculté de médecine de Grenoble, CNRS, CHU Grenoble Alpes, University Grenoble Alpes, Grenoble INP*, TIMC-IMAG, 38000 Grenoble, France; (O.M.); (D.J.B.); (D.H.); (S.H.-M.); (C.L.); (M.M.); (C.P.); (B.T.)
| | - Sarah Huot-Marchand
- Département de Biochimie, Faculté de médecine de Grenoble, CNRS, CHU Grenoble Alpes, University Grenoble Alpes, Grenoble INP*, TIMC-IMAG, 38000 Grenoble, France; (O.M.); (D.J.B.); (D.H.); (S.H.-M.); (C.L.); (M.M.); (C.P.); (B.T.)
| | - Claire Léger
- Département de Biochimie, Faculté de médecine de Grenoble, CNRS, CHU Grenoble Alpes, University Grenoble Alpes, Grenoble INP*, TIMC-IMAG, 38000 Grenoble, France; (O.M.); (D.J.B.); (D.H.); (S.H.-M.); (C.L.); (M.M.); (C.P.); (B.T.)
| | - Max Maurin
- Département de Biochimie, Faculté de médecine de Grenoble, CNRS, CHU Grenoble Alpes, University Grenoble Alpes, Grenoble INP*, TIMC-IMAG, 38000 Grenoble, France; (O.M.); (D.J.B.); (D.H.); (S.H.-M.); (C.L.); (M.M.); (C.P.); (B.T.)
| | - Tuan-Dung Ngo
- CEA, INSERM, CNRS, Bacterial Pathogenesis and Cellular Responses, University Grenoble Alpes, UMR 1036/ERL 5261, 17 avenue des Martyrs, 38054 Grenoble, France; (E.F.); (T.-D.N.); (I.A.)
| | - Caroline Plazy
- Département de Biochimie, Faculté de médecine de Grenoble, CNRS, CHU Grenoble Alpes, University Grenoble Alpes, Grenoble INP*, TIMC-IMAG, 38000 Grenoble, France; (O.M.); (D.J.B.); (D.H.); (S.H.-M.); (C.L.); (M.M.); (C.P.); (B.T.)
| | - Robert A. Quinn
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA;
| | - Ina Attree
- CEA, INSERM, CNRS, Bacterial Pathogenesis and Cellular Responses, University Grenoble Alpes, UMR 1036/ERL 5261, 17 avenue des Martyrs, 38054 Grenoble, France; (E.F.); (T.-D.N.); (I.A.)
| | - François Fenaille
- Département Médicaments et Technologies pour la Santé (DMTS), University Paris-Saclay, CEA, INRAE, MetaboHUB, 91191 Gif sur Yvette, France; (F.C.); (S.T.); (F.F.)
| | - Bertrand Toussaint
- Département de Biochimie, Faculté de médecine de Grenoble, CNRS, CHU Grenoble Alpes, University Grenoble Alpes, Grenoble INP*, TIMC-IMAG, 38000 Grenoble, France; (O.M.); (D.J.B.); (D.H.); (S.H.-M.); (C.L.); (M.M.); (C.P.); (B.T.)
| | - Audrey Le Gouëllec
- Département de Biochimie, Faculté de médecine de Grenoble, CNRS, CHU Grenoble Alpes, University Grenoble Alpes, Grenoble INP*, TIMC-IMAG, 38000 Grenoble, France; (O.M.); (D.J.B.); (D.H.); (S.H.-M.); (C.L.); (M.M.); (C.P.); (B.T.)
- Correspondence:
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16
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Almeida MM, Freitas MT, Folescu TW, Firmida MC, Carvalho-Assef APD, Marques EA, Leão RS. Carbapenem-Resistant Pseudomonas aeruginosa in Chronic Lung Infection: Current Resistance Profile and Hypermutability in Patients with Cystic Fibrosis. Curr Microbiol 2021; 78:696-704. [PMID: 33404752 DOI: 10.1007/s00284-020-02337-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 12/14/2020] [Indexed: 11/29/2022]
Abstract
Pseudomonas aeruginosa is associated with chronic and progressive lung disease and is closely related to increased morbidity and mortality in cystic fibrosis (CF) patients. Hypermutable (HPM) P. aeruginosa isolates have been described in these patients and are usually associated with antibiotic resistance. This study aimed to investigate the occurrence of carbapenem resistance and hypermutable phenotype in 179 P. aeruginosa isolates from 8 chronically CF patients assisted at two reference centers in Rio de Janeiro, Brazil. Using disk diffusion test, non-susceptible (NS) rates higher than 40% were observed for imipenem, amikacin, and gentamicin. A total of 79 isolates (44.1%), 71 (39.6%), and 8 (4.4%) were classified as carbapenem-resistant (CR resistance to at least one carbapenem), multidrug-resistant (MDR), and extensively drug-resistant (XDR), respectively. Minimal inhibitory concentration was determined for 79 CR P. aeruginosa and showed the following variations: 4 and 128 μg/mL to imipenem, 4 and 64 µg/mL to meropenem, and 4 and ≥ 32 µg/mL to doripenem. We have found only four (2.23%) HPM isolates from 4 patients. Analyzing the genetic relationship among the HPM isolates, 3 pulsed-field gel electrophoresis/pulsotypes (D, M, and J) were observed. Only M pulsotype was recovered from two patients in different years. Polymerase chain reaction screening for blaGES, blaIMP, blaKPC, blaNDM, blaOXA-48, blaSPM, and blaVIM genes was performed for all CR isolates and none of them were positive. Our results demonstrate a high occurrence of CR and MDR P. aeruginosa of CF patients follow-up in both centers studied, while the presence of HPM is still unusual.
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Affiliation(s)
- Mila M Almeida
- Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Meyvianne T Freitas
- Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Tania W Folescu
- Instituto Nacional de Saúde da Mulher, Criança e do Adolescente Fernandes Figueira, Centro de Referência para Crianças e Adolescentes com Fibrose Cística - Ministério da Saúde, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | - Monica C Firmida
- Departamento de Doenças do Tórax, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ana Paula D'A Carvalho-Assef
- Laboratório de Pesquisa em Infecção Hospitalar, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
| | - Elizabeth A Marques
- Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Robson S Leão
- Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil.
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17
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Ramsay KA, Wardell SJT, Patrick WM, Brockway B, Reid DW, Winstanley C, Bell SC, Lamont IL. Genomic and phenotypic comparison of environmental and patient-derived isolates of Pseudomonas aeruginosa suggest that antimicrobial resistance is rare within the environment. J Med Microbiol 2019; 68:1591-1595. [PMID: 31553303 DOI: 10.1099/jmm.0.001085] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Patient-derived isolates of the opportunistic pathogen Pseudomonas aeruginosa are frequently resistant to antibiotics due to the presence of sequence variants in resistance-associated genes. However, the frequency of antibiotic resistance and of resistance-associated sequence variants in environmental isolates of P. aeruginosa has not been well studied. Antimicrobial susceptibility testing (ciprofloxacin, ceftazidime, meropenem, tobramycin) of environmental (n=50) and cystic fibrosis (n=42) P. aeruginosa isolates was carried out. Following whole genome sequencing of all isolates, 25 resistance-associated genes were analysed for the presence of likely function-altering sequence variants. Environmental isolates were susceptible to all antibiotics with one exception, whereas patient-derived isolates had significant frequencies of resistance to each antibiotic and a greater number of likely resistance-associated genetic variants. These findings indicate that the natural environment does not act as a reservoir of antibiotic-resistant P. aeruginosa, supporting a model in which antibiotic susceptible environmental bacteria infect patients and develop resistance during infection.
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Affiliation(s)
- Kay A Ramsay
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
| | | | - Wayne M Patrick
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Ben Brockway
- Department of Medicine, University of Otago, Dunedin, New Zealand
| | - David W Reid
- Department of Thoracic Medicine, The Prince Charles Hospital, Brisbane, Australia.,QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Craig Winstanley
- Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
| | - Scott C Bell
- Faculty of Medicine, The University of Queensland, Brisbane, Australia.,Department of Thoracic Medicine, The Prince Charles Hospital, Brisbane, Australia.,QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Iain L Lamont
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
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18
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Kamal SM, Rybtke ML, Nimtz M, Sperlein S, Giske C, Trček J, Deschamps J, Briandet R, Dini L, Jänsch L, Tolker-Nielsen T, Lee C, Römling U. Two FtsH Proteases Contribute to Fitness and Adaptation of Pseudomonas aeruginosa Clone C Strains. Front Microbiol 2019; 10:1372. [PMID: 31338071 PMCID: PMC6629908 DOI: 10.3389/fmicb.2019.01372] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Accepted: 05/31/2019] [Indexed: 12/30/2022] Open
Abstract
Pseudomonas aeruginosa is an environmental bacterium and a nosocomial pathogen with clone C one of the most prevalent clonal groups. The P. aeruginosa clone C specific genomic island PACGI-1 harbors a xenolog of ftsH encoding a functionally diverse membrane-spanning ATP-dependent metalloprotease on the core genome. In the aquatic isolate P. aeruginosa SG17M, the core genome copy ftsH1 significantly affects growth and dominantly mediates a broad range of phenotypes, such as secretion of secondary metabolites, swimming and twitching motility and resistance to aminoglycosides, while the PACGI-1 xenolog ftsH2 backs up the phenotypes in the ftsH1 mutant background. The two proteins, with conserved motifs for disaggregase and protease activity present in FtsH1 and FtsH2, have the ability to form homo- and hetero-oligomers with ftsH2 distinctively expressed in the late stationary phase of growth. However, mainly FtsH1 degrades a major substrate, the heat shock transcription factor RpoH. Pull-down experiments with substrate trap-variants inactive in proteolytic activity indicate both FtsH1 and FtsH2 to interact with the inhibitory protein HflC, while the phenazine biosynthesis protein PhzC was identified as a substrate of FtsH1. In summary, as an exception in P. aeruginosa, clone C harbors two copies of the ftsH metallo-protease, which cumulatively are required for the expression of a diversity of phenotypes.
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Affiliation(s)
- Shady Mansour Kamal
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
- Department of Microbiology and Immunology, Faculty of Pharmaceutical Sciences & Pharmaceutical Industries, Future University in Egypt, New Cairo, Egypt
| | - Morten Levin Rybtke
- Costerton Biofilm Center, Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Manfred Nimtz
- Department of Cellular Proteomics, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Stefanie Sperlein
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Christian Giske
- Division of Clinical Microbiology, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Janja Trček
- Department of Biology, Faculty of Natural Sciences and Mathematics, University of Maribor, Maribor, Slovenia
| | - Julien Deschamps
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, Jouy-en-Josas, France
| | - Romain Briandet
- Micalis Institute, INRA, AgroParisTech, Université Paris-Saclay, Jouy-en-Josas, France
| | - Luciana Dini
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Lecce, Italy
| | - Lothar Jänsch
- Department of Cellular Proteomics, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Tim Tolker-Nielsen
- Costerton Biofilm Center, Department of Immunology and Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Changhan Lee
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Ute Römling
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
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19
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Perry EK, Newman DK. The transcription factors ActR and SoxR differentially affect the phenazine tolerance of Agrobacterium tumefaciens. Mol Microbiol 2019; 112:199-218. [PMID: 31001852 PMCID: PMC6615960 DOI: 10.1111/mmi.14263] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/13/2019] [Indexed: 01/01/2023]
Abstract
Bacteria in soils encounter redox-active compounds, such as phenazines, that can generate oxidative stress, but the mechanisms by which different species tolerate these compounds are not fully understood. Here, we identify two transcription factors, ActR and SoxR, that play contrasting yet complementary roles in the tolerance of the soil bacterium Agrobacterium tumefaciens to phenazines. We show that ActR promotes phenazine tolerance by proactively driving expression of a more energy-efficient terminal oxidase at the expense of a less efficient alternative, which may affect the rate at which phenazines abstract electrons from the electron transport chain (ETC) and thereby generate reactive oxygen species. SoxR, on the other hand, responds to phenazines by inducing expression of several efflux pumps and redox-related genes, including one of three copies of superoxide dismutase and five novel members of its regulon that could not be computationally predicted. Notably, loss of ActR is far more detrimental than loss of SoxR at low concentrations of phenazines, and also increases dependence on the otherwise functionally redundant SoxR-regulated superoxide dismutase. Our results thus raise the intriguing possibility that the composition of an organism's ETC may be the driving factor in determining sensitivity or tolerance to redox-active compounds.
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Affiliation(s)
- Elena K Perry
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Dianne K Newman
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, 91125, USA
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20
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Machreki Y, Kouidhi B, Machreki S, Chaieb K, Sáenz Y. Analysis of a long term starved Pseudomonas aeruginosa ATCC27853 in seawater microcosms. Microb Pathog 2019; 134:103595. [PMID: 31201902 DOI: 10.1016/j.micpath.2019.103595] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 05/13/2019] [Accepted: 06/11/2019] [Indexed: 12/13/2022]
Abstract
The persistence of pathogenic bacteria in the marine environment has been thoroughly investigated. The potential threat that these microorganisms pose to public health in recreational waters has always been a concern. In this study, the persistence and the response of Pseudomonas aeruginosa ATCC27853 to starvation and osmotic stress were studied after its incubation in sterilized seawater during 12 months. Three different colonial variants were isolated: A7 after one month, and A81 and A82 after 8 months of incubation period. The incubation effect on the bacterial phenotype and genotype were studied by analyzing modifications in morphology, antibiotic and metal resistance, molecular typing (PFGE and MLST), pigment production and virulence factors. The starved variants showed three different colony forms, but an indistinguishable PFGE pattern and belonged to ST155, as P. aeruginosa ATCC27853. The starved variants maintained the susceptibility to the 13 tested antibiotics, with the exception of the imipenem-resistant A82 strain, which also showed a small colony variant phenotype and the highest values of tolerance to the CuSO4 + NaCl combination. Significant differences were detected in the pigment production, the elastase activity and cytotoxic potential of the starved isolates in comparison to P. aeruginosa ATCC27853. Long-term exposure to stress, such as the incubation in seawater, was shown to induce different responses in P. aeruginosa, including virulent and resistant phenotypes.
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Affiliation(s)
- Yasmine Machreki
- Laboratory of Analysis, Treatment and Valorization of Pollutants of the Environment and Products, Faculty of Pharmacy, Monastir University, Tunisia
| | - Bochra Kouidhi
- Medical Laboratory Department, College of Applied Medical Sciences, Yanbu, Taibah University, Saudi Arabia.
| | - Sawsen Machreki
- Emergency Department, Hospital of Al Imam Abdulrahman Al Faisal, Riyadh, Saudi Arabia
| | - Kamel Chaieb
- Laboratory of Analysis, Treatment and Valorization of Pollutants of the Environment and Products, Faculty of Pharmacy, Monastir University, Tunisia
| | - Yolanda Sáenz
- Molecular Microbiology Area, Center for Biomedical Research of La Rioja (CIBIR), Logroño, Spain
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21
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Is the Potable Water System an Advantageous Preinfection Niche for Bacteria Colonizing the Cystic Fibrosis Lung? mBio 2019; 10:mBio.00883-19. [PMID: 31164466 PMCID: PMC6550525 DOI: 10.1128/mbio.00883-19] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
People with cystic fibrosis are susceptible to lung infections from a variety of bacteria, a number of which also reside in the potable water system, including Pseudomonas aeruginosa, Stenotrophomonas maltophilia, Achromobacter xylosoxidans, Burkholderia cepacia complex, and nontuberculosis Mycobacteria. Here, I propose chemical and physical aspects of the potable water system along with bacterial lifestyle strategies in this system that may enhance successful colonization of cystic fibrosis lungs by these bacteria, including iron and copper levels, lipids, and low growth rates within low-oxygen biofilms. People with cystic fibrosis are susceptible to lung infections from a variety of bacteria, a number of which also reside in the potable water system, including Pseudomonas aeruginosa, Stenotrophomonas maltophilia, Achromobacter xylosoxidans, Burkholderia cepacia complex, and nontuberculosis Mycobacteria. Here, I propose chemical and physical aspects of the potable water system along with bacterial lifestyle strategies in this system that may enhance successful colonization of cystic fibrosis lungs by these bacteria, including iron and copper levels, lipids, and low growth rates within low-oxygen biofilms.
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Lee C, Kamal SM, Römling U. High frequency of double crossover recombination facilitates genome engineering in Pseudomonas aeruginosa PA14 and clone C strains. MICROBIOLOGY-SGM 2019; 165:757-760. [PMID: 31091189 DOI: 10.1099/mic.0.000812] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Pseudomonas aeruginosa is a key opportunistic human pathogen. An established procedure to replace a target gene is two-step allelic exchange, i.e. selection of single crossover at homologous sequences and subsequent counter selection to induce double crossover for excision of the suicide vector. In this study, we found that certain strains of P. aeruginosa display a high rate of instant double crossover upon introduction of a suicide vector containing an antibiotic resistance cassette flanked by adjacent sequences for gene replacement, making the counter selection step to achieve the second crossover superfluous. Assessment of a limited panel of target genes commonly showed negligible double crossover with a frequency <20 % in the genetic reference strain PAO1, whereas a high double crossover frequency of >70 % was observed for PA14 and clone C strains. Consequently, for certain P. aeruginosa strains replacement of an ORF by a antibiotic resistance cassette can be shortened by directly selecting for double crossover recombination.
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Affiliation(s)
- Changhan Lee
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, 17177, Sweden
| | - Shady Mansour Kamal
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, 17177, Sweden.,Department of Microbiology and Immunology, Faculty of Pharmaceutical Sciences and Pharmaceutical Industries, Future University in Egypt, Cairo, 11835, Egypt
| | - Ute Römling
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, 17177, Sweden
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Cystic Fibrosis-Associated Stenotrophomonas maltophilia Strain-Specific Adaptations and Responses to pH. J Bacteriol 2019; 201:JB.00478-18. [PMID: 30642989 PMCID: PMC6416904 DOI: 10.1128/jb.00478-18] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 01/08/2019] [Indexed: 01/22/2023] Open
Abstract
Understanding bacterial responses to physiological conditions is an important priority for combating opportunistic infections. The majority of CF patients succumb to inflammation and necrosis in the airways, arising from chronic infection due to ineffective mucociliary clearance. Steep pH gradients characterize the CF airways but are not often incorporated in standard microbiology culture conditions. Stenotrophomonas maltophilia is a prevalent CF opportunistic pathogen also found in many disparate environments, yet this bacterium’s contribution to CF lung damage and its response to changing environmental factors remain largely understudied. Here, we show that pH impacts the physiology and antibiotic susceptibility of S. maltophilia, with implications for the development of relevant in vitro models and assessment of antibiotic sensitivity. The airway fluids of cystic fibrosis (CF) patients contain local pH gradients and are more acidic than those of healthy individuals. pH is a critical factor that is often overlooked in studies seeking to recapitulate the infection microenvironment. We sought to determine the impact of pH on the physiology of a ubiqituous yet understudied microbe, Stenotrophomonas maltophilia. Phylogenomics was first used to reconstruct evolutionary relationships between 74 strains of S. maltophilia (59 from CF patients). Neither the core genome (2,158 genes) nor the accessory genome (11,978 genes) distinguish the CF and non-CF isolates; however, strains from similar isolation sources grouped into the same subclades. We grew two human and six CF S. maltophilia isolates from different subclades at a range of pH values and observed impaired growth and altered antibiotic tolerances at pH 5. Transcriptomes revealed increased expression of both antibiotic resistance and DNA repair genes in acidic conditions. Although the gene expression profiles of S. maltophilia in lab cultures and CF sputum were distinct, we found that the same genes associated with low pH were also expressed during infection, and the higher pH cultures were more similar to sputum metatranscriptomes. Our findings suggest that S. maltophilia is not well adapted to acidity and may cope with low pH by expressing stress response genes and colonizing less acidic microenvironments. As a whole, our study underlines the impact of microenvironments on bacterial colonization and adaptation in CF infections. IMPORTANCE Understanding bacterial responses to physiological conditions is an important priority for combating opportunistic infections. The majority of CF patients succumb to inflammation and necrosis in the airways, arising from chronic infection due to ineffective mucociliary clearance. Steep pH gradients characterize the CF airways but are not often incorporated in standard microbiology culture conditions. Stenotrophomonas maltophilia is a prevalent CF opportunistic pathogen also found in many disparate environments, yet this bacterium’s contribution to CF lung damage and its response to changing environmental factors remain largely understudied. Here, we show that pH impacts the physiology and antibiotic susceptibility of S. maltophilia, with implications for the development of relevant in vitro models and assessment of antibiotic sensitivity.
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Batrich M, Maskeri L, Schubert R, Ho B, Kohout M, Abdeljaber M, Abuhasna A, Kholoki M, Psihogios P, Razzaq T, Sawhney S, Siddiqui S, Xoubi E, Cooper A, Hatzopoulos T, Putonti C. Pseudomonas Diversity Within Urban Freshwaters. Front Microbiol 2019; 10:195. [PMID: 30828321 PMCID: PMC6384249 DOI: 10.3389/fmicb.2019.00195] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 01/23/2019] [Indexed: 11/23/2022] Open
Abstract
Freshwater lakes are home to bacterial communities with 1000s of interdependent species. Numerous high-throughput 16S rRNA gene sequence surveys have provided insight into the microbial taxa found within these waters. Prior surveys of Lake Michigan waters have identified bacterial species common to freshwater lakes as well as species likely introduced from the urban environment. We cultured bacterial isolates from samples taken from the Chicago nearshore waters of Lake Michigan in an effort to look more closely at the genetic diversity of species found there within. The most abundant genus detected was Pseudomonas, whose presence in freshwaters is often attributed to storm water or runoff. Whole genome sequencing was conducted for 15 Lake Michigan Pseudomonas strains, representative of eight species and three isolates that could not be resolved with named species. These genomes were examined specifically for genes encoding functionality which may be advantageous in their urban environment. Antibiotic resistance, amidst other known virulence factors and defense mechanisms, were identified in the genome annotations and verified in the lab. We also tested the Lake Michigan Pseudomonas strains for siderophore production and resistance to the heavy metals mercury and copper. As the study presented here shows, a variety of pseudomonads have inhabited the urban coastal waters of Lake Michigan.
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Affiliation(s)
- Mary Batrich
- Niehoff School of Nursing, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, United States
| | - Laura Maskeri
- Bioinformatics Program, Loyola University Chicago, Chicago, IL, United States
| | - Ryan Schubert
- Bioinformatics Program, Loyola University Chicago, Chicago, IL, United States.,Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Brian Ho
- Bioinformatics Program, Loyola University Chicago, Chicago, IL, United States.,Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Melanie Kohout
- Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Malik Abdeljaber
- Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Ahmed Abuhasna
- Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Mutah Kholoki
- Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Penelope Psihogios
- Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Tahir Razzaq
- Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Samrita Sawhney
- Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Salah Siddiqui
- Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Eyad Xoubi
- Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Alexandria Cooper
- Department of Biology, Loyola University Chicago, Chicago, IL, United States
| | - Thomas Hatzopoulos
- Department of Computer Science, Loyola University Chicago, Chicago, IL, United States
| | - Catherine Putonti
- Bioinformatics Program, Loyola University Chicago, Chicago, IL, United States.,Department of Biology, Loyola University Chicago, Chicago, IL, United States.,Department of Computer Science, Loyola University Chicago, Chicago, IL, United States.,Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, United States
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Liew SM, Rajasekaram G, Puthucheary SA, Chua KH. Antimicrobial susceptibility and virulence genes of clinical and environmental isolates of Pseudomonas aeruginosa. PeerJ 2019; 7:e6217. [PMID: 30697478 PMCID: PMC6346980 DOI: 10.7717/peerj.6217] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 12/05/2018] [Indexed: 01/03/2023] Open
Abstract
Background Pseudomonas aeruginosa is ubiquitous, has intrinsic antibiotic resistance mechanisms, and is associated with serious hospital-associated infections. It has evolved from being a burn wound infection into a major nosocomial threat. In this study, we compared and correlated the antimicrobial resistance, virulence traits and clonal relatedness between clinical and fresh water environmental isolates of P. aeruginosa. Methods 219 P. aeruginosa isolates were studied: (a) 105 clinical isolates from 1977 to 1985 (n = 52) and 2015 (n = 53), and (b) 114 environmental isolates from different fresh water sources. All isolates were subjected to ERIC-PCR typing, antimicrobial susceptibility testing and virulence factor genes screening. Results Clinical and environmental isolates of P. aeruginosa were genetically heterogenous, with only four clinical isolates showing 100% identical ERIC-PCR patterns to seven environmental isolates. Most of the clinical and environmental isolates were sensitive to almost all of the antipseudomonal drugs, except for ticarcillin/clavulanic acid. Increased resistant isolates was seen in 2015 compared to that of the archived isolates; four MDR strains were detected and all were retrieved in 2015. All clinical isolates retrieved from 1977 to 1985 were susceptible to ceftazidime and ciprofloxacin; but in comparison, the clinical isolates recovered in 2015 exhibited 9.4% resistance to ceftazidime and 5.7% to ciprofloxacin; a rise in resistance to imipenem (3.8% to 7.5%), piperacillin (9.6% to 11.3%) and amikacin (1.9% to 5.7%) and a slight drop in resistance rates to piperacillin/tazobactam (7.7% to 7.5%), ticarcillin/clavulanic acid (19.2% to 18.9%), meropenem (15.4% to 7.5%), doripenem (11.5% to 7.5%), gentamicin (7.7% to 7.5%) and netilmicin (7.7% to 7.5%). Environmental isolates were resistant to piperacillin/tazobactam (1.8%), ciprofloxacin (1.8%), piperacillin (4.4%) and carbapenems (doripenem 11.4%, meropenem 8.8% and imipenem 2.6%). Both clinical and environmental isolates showed high prevalence of virulence factor genes, but none were detected in 10 (9.5%) clinical and 18 (15.8%) environmental isolates. The exoT gene was not detected in any of the clinical isolates. Resistance to carbapenems (meropenem, doripenem and imipenem), β-lactamase inhibitors (ticarcillin/clavulanic acid and piperacillin/tazobactam), piperacillin, ceftazidime and ciprofloxacin was observed in some of the isolates without virulence factor genes. Five virulence-negative isolates were susceptible to all of the antimicrobials. Only one MDR strain harbored none of the virulence factor genes. Conclusion Over a period of 30 years, a rise in antipseudomonal drug resistance particularly to ceftazidime and ciprofloxacin was observed in two hospitals in Malaysia. The occurrence of resistant environmental isolates from densely populated areas is relevant and gives rise to collective anxiety to the community at large.
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Affiliation(s)
- Siew Mun Liew
- Department of Biomedical Science, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | | | - Sd Ampalam Puthucheary
- Department of Biomedical Science, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
| | - Kek Heng Chua
- Department of Biomedical Science, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
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Alcalde-Rico M, Olivares-Pacheco J, Alvarez-Ortega C, Cámara M, Martínez JL. Role of the Multidrug Resistance Efflux Pump MexCD-OprJ in the Pseudomonas aeruginosa Quorum Sensing Response. Front Microbiol 2018; 9:2752. [PMID: 30532741 PMCID: PMC6266676 DOI: 10.3389/fmicb.2018.02752] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 10/26/2018] [Indexed: 11/15/2022] Open
Abstract
Multidrug efflux pumps constitute a category of antibiotic resistance determinants that are a part of the core bacterial genomes. Given their conservation, it is conceivable that they present functions beyond the extrusion of antibiotics currently used for therapy. Pseudomonas aeruginosa stands as a relevant respiratory pathogen, with a high prevalence at hospitals and in cystic fibrosis patients. Part of its success relies on its low susceptibility to antibiotics and on the production of virulence factors, whose expression is regulated in several cases by quorum sensing (QS). We found that overexpression of the MexCD-OprJ multidrug efflux pump shuts down the P. aeruginosa QS response. Our results support that MexCD-OprJ extrudes kynurenine, a precursor of the alkyl-quinolone signal (AQS) molecules. Anthranilate and octanoate, also AQS precursors, do not seem to be extruded by MexCD-OprJ. Kynurenine extrusion is not sufficient to reduce the QS response in a mutant overexpressing this efflux pump. Impaired QS response is mainly due to the extrusion of 4-hydroxy-2-heptylquinoline (HHQ), the precursor of the Pseudomonas Quinolone Signal (PQS), leading to low PQS intracellular levels and reduced production of QS signal molecules. As the consequence, the expression of QS-regulated genes is impaired and the production of QS-regulated virulence factors strongly decreases in a MexCD-OprN P. aeruginosa overexpressing mutant. Previous work showed that MexEF-OprJ, another P. aeruginosa efflux pump, is also able of extruding kynurenine and HHQ. However, opposite to our findings, the QS defect in a MexEF-OprN overproducer is due to kynurenine extrusion. These results indicate that, although efflux pumps can share some substrates, the affinity for each of them can be different. Although the QS response is triggered by population density, information on additional elements able of modulating such response is still scarce. This is particularly important in the case of P. aeruginosa lung chronic infections, a situation in which QS-defective mutants are accumulated. If MexCD-OprJ overexpression alleviates the cost associated to triggering the QS response when un-needed, it could be possible that MexCD-OprJ antibiotic resistant overproducer strains might be selected even in the absence of antibiotic selective pressure, acting as antibiotic resistant cheaters in heterogeneous P. aeruginosa populations.
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Affiliation(s)
- Manuel Alcalde-Rico
- Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Jorge Olivares-Pacheco
- Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Carolina Alvarez-Ortega
- Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Miguel Cámara
- Centre for Biomolecular Sciences, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom
| | - José Luis Martínez
- Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, Madrid, Spain
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Rutherford V, Yom K, Ozer EA, Pura O, Hughes A, Murphy KR, Cudzilo L, Mitchel D, Hauser AR. Environmental reservoirs for exoS+ and exoU+ strains of Pseudomonas aeruginosa. ENVIRONMENTAL MICROBIOLOGY REPORTS 2018; 10:485-492. [PMID: 29687624 PMCID: PMC6108916 DOI: 10.1111/1758-2229.12653] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 04/15/2018] [Indexed: 06/08/2023]
Abstract
Pseudomonas aeruginosa uses its type III secretion system to inject the effector proteins ExoS and ExoU into eukaryotic cells, which subverts these cells to the bacterium's advantage and contributes to severe infections. We studied the environmental reservoirs of exoS+ and exoU+ strains of P. aeruginosa by collecting water, soil, moist substrates and plant samples from environments in the Chicago region and neighbouring states. Whole-genome sequencing was used to determine the phylogeny and type III secretion system genotypes of 120 environmental isolates. No correlation existed between geographic separation of isolates and their genetic relatedness, which confirmed previous findings of both high genetic diversity within a single site and the widespread distribution of P. aeruginosa clonal complexes. After excluding clonal isolates cultured from the same samples, 74 exoS+ isolates and 16 exoU+ isolates remained. Of the exoS+ isolates, 41 (55%) were from natural environmental sites and 33 (45%) were from man-made sites. Of the exoU+ isolates, only 3 (19%) were from natural environmental sites and 13 (81%) were from man-made sites (p < 0.05). These findings suggest that man-made water systems may be a reservoir from which patients acquire exoU+ P. aeruginosa strains.
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Affiliation(s)
- Victoria Rutherford
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Kelly Yom
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Egon A. Ozer
- Department of Medicine, Division of Infectious Diseases, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Olivia Pura
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Ami Hughes
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Katherine R. Murphy
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Laura Cudzilo
- Department of Biology, St. John’s University, Collegeville, Minnesota
| | - David Mitchel
- Department of Biology, St. John’s University, Collegeville, Minnesota
| | - Alan R. Hauser
- Department of Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois
- Department of Medicine, Division of Infectious Diseases, Northwestern University Feinberg School of Medicine, Chicago, Illinois
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Abstract
Purpose of Review The purpose of this review is to discuss the risk of bacterial cross-infection for bronchiectasis patients in the outpatient setting. Cross-infection has primarily been a matter of concern in cystic fibrosis (CF). There is considerable evidence of transmission of pathogens between CF patients, and this has led to guideline recommendations advocating strict segregation policies. Guidelines in bronchiectasis do not specifically address the issue of cross-infection. If cross-infection is prevalent, it may have significant implications for patients and the practical running of specialist care. Recent Findings Multiple UK-based studies have now published evidence of cross-infection with Pseudomonas aeruginosa within cohorts of bronchiectasis patients; however, the risk does not appear to be high. There is also evidence suggesting cross-infection from CF patients to bronchiectasis patients. Summary The current evidence for cross-infection in bronchiectasis is limited, but suggests a small risk with Pseudomonas aeruginosa. Longitudinal studies looking at Pseudomonas aeruginosa and other pathogens are now required.
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Caskey S, Stirling J, Moore J, Rendall J. Occurrence ofPseudomonas aeruginosain waters: implications for patients with cystic fibrosis (CF). Lett Appl Microbiol 2018. [DOI: 10.1111/lam.12876] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- S. Caskey
- Regional Adult Cystic Fibrosis Centre; Level 8; Belfast City Hospital; Belfast UK
| | - J. Stirling
- Northern Ireland Public Health Laboratory; Department of Bacteriology; Belfast City Hospital; Belfast UK
| | - J.E. Moore
- Regional Adult Cystic Fibrosis Centre; Level 8; Belfast City Hospital; Belfast UK
- Northern Ireland Public Health Laboratory; Department of Bacteriology; Belfast City Hospital; Belfast UK
| | - J.C. Rendall
- Regional Adult Cystic Fibrosis Centre; Level 8; Belfast City Hospital; Belfast UK
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Transcriptional Responses of Pseudomonas aeruginosa to Potable Water and Freshwater. Appl Environ Microbiol 2018; 84:AEM.02350-17. [PMID: 29305509 DOI: 10.1128/aem.02350-17] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 01/01/2018] [Indexed: 02/03/2023] Open
Abstract
Many Pseudomonas aeruginosa infections are derived from residential, recreational, or surface water sources; thus, these environments represent an important preinfection niche. To better understand P. aeruginosa biology in these environments, we quantified transcriptional changes by microarray after exposure to diluted LB, diluted R2B, potable tap water, and freshwater from a eutrophic pond. Quantitative reverse transcription-PCR (qRT-PCR) confirmed the conservation of these responses in other water sources, and competition experiments were used to test the importance of three implicated metabolic pathways. The global transcriptional responses in potable water and freshwater showed strong induction of genes involved in metabolism of the head groups and acyl tails of phospholipids, as well as nucleotide metabolism, with commensurate decreased transcript expression of genes encoding their synthetic pathways. These data suggest that phospholipids and nucleotides are part of the nutritional milieu of these two environments. A unique response in municipal-delivered potable water was to the metals in the piping system, particularly copper. To identify potential nutrient sources used by P. aeruginosa in these environments, we used competition assays between the wild-type and deletion mutant strains in three pathways induced under these conditions. For phospholipid head-group metabolism, ethanolamine utilization (eutB) was important for competition in potable water, while choline oxidation (betBA) was important for competition in freshwater. Nucleotide utilization, particularly pyrimidine metabolism (dht), showed a trend toward importance in freshwater but was not statistically significant. These findings provide new insights into the P. aeruginosa response to potable water and freshwater and led to the identification of potentially important nutrient sources in these environments.IMPORTANCE Much of our knowledge about Pseudomonas aeruginosa comes from the infection niche, and much less is known about its lifestyle in the environment. P. aeruginosa is an adaptable bacterium capable of growing in many environments but is particularly common in potable water systems and freshwater. We used the transcriptional responses of P. aeruginosa to these environments to identify important nutrient sources specific to either of these two environments. Additionally, these environments could provide experimental situations to understand gene function for the large number of transcripts with unknown functions induced under these conditions.
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Identification of AHL- and BDSF-Controlled Proteins in Burkholderia cenocepacia by Proteomics. Methods Mol Biol 2018; 1673:193-202. [PMID: 29130174 DOI: 10.1007/978-1-4939-7309-5_15] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
We used comparative proteome analysis to determine the target genes of the two quorum sensing (QS) circuits in the opportunistic pathogen Burkholderia cenocepacia: the N-acyl homoserine lactone (AHL)-based CepIR system and the BDSF (B urkholderia diffusible signal factor, cis-2-dodecenoic acid)-based RpfFR system. In this book chapter, we focus on the description of the practical procedure we currently use in the laboratory to perform a sensitive GeLC-MS/MS shotgun proteomics experiment; we also briefly describe the downstream bioinformatic data analysis.
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Stand-alone ClpG disaggregase confers superior heat tolerance to bacteria. Proc Natl Acad Sci U S A 2017; 115:E273-E282. [PMID: 29263094 DOI: 10.1073/pnas.1712051115] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
AAA+ disaggregases solubilize aggregated proteins and confer heat tolerance to cells. Their disaggregation activities crucially depend on partner proteins, which target the AAA+ disaggregases to protein aggregates while concurrently stimulating their ATPase activities. Here, we report on two potent ClpG disaggregase homologs acquired through horizontal gene transfer by the species Pseudomonas aeruginosa and subsequently abundant P. aeruginosa clone C. ClpG exhibits high, stand-alone disaggregation potential without involving any partner cooperation. Specific molecular features, including high basal ATPase activity, a unique aggregate binding domain, and almost exclusive expression in stationary phase distinguish ClpG from other AAA+ disaggregases. Consequently, ClpG largely contributes to heat tolerance of P. aeruginosa primarily in stationary phase and boosts heat resistance 100-fold when expressed in Escherichia coli This qualifies ClpG as a potential persistence and virulence factor in P. aeruginosa.
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Maroui I, Barguigua A, Aboulkacem A, Elhafa H, Ouarrak K, Sbiti M, Louzi L, Timinouni M, Belhaj A. Clonal Analysis of Clinical and Environmental Pseudomonas aeruginosa Isolates from Meknes Region, Morocco. Pol J Microbiol 2017; 66:397-400. [PMID: 29319518 DOI: 10.5604/01.3001.0010.4882] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
From 123 clinical and environmental Pseudomonas aeruginosa isolates, 24 strains were selected for their similar antibioresistance, virulence and biofilm formation profiles, to examine their diversity and occurrence of clones within two hospitals and different natural sites in Meknes (Morocco). Pulsed-field gel electrophoresis, using DraI enzyme, didn't reveal a close relationship between clinical and environmental isolates nor between strains of the two hospitals. 19 genotypes were obtained, including two virulent environmental clones and three clinical clones virulent and resistant to antibiotics. Intra-hospital transmission of high-risk clones detected, in and between wards, constitutes a great public health concern.
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Affiliation(s)
- Itto Maroui
- Ecology and Biodiversity of Wetlands Team, Department of Biology, Faculty of Sciences, Moulay Ismail University, Meknes, Morocco
| | - Abouddihaj Barguigua
- Molecular Bacteriology Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Asmae Aboulkacem
- Ecology and Biodiversity of Wetlands Team, Department of Biology, Faculty of Sciences, Moulay Ismail University, Meknes, Morocco
| | - Hanane Elhafa
- Ecology and Biodiversity of Wetlands Team, Department of Biology, Faculty of Sciences, Moulay Ismail University, Meknes, Morocco
| | - Khadija Ouarrak
- Medical Biology Laboratory of Regional Hospital Mohammed V Meknes, Morocco
| | - Mohammed Sbiti
- Medical Biology Laboratory of Regional Military Hospital Moulay Ismail Meknes, Morocco
| | - Lhoussain Louzi
- Medical Biology Laboratory of Regional Military Hospital Moulay Ismail Meknes, Morocco
| | - Mohammed Timinouni
- Molecular Bacteriology Laboratory, Institut Pasteur du Maroc, Casablanca, Morocco
| | - Abdelhaq Belhaj
- Ecology and Biodiversity of Wetlands Team, Department of Biology, Faculty of Sciences, Moulay Ismail University, Meknes, Morocco
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Collia D, Bannister TD, Tan H, Jin S, Langaee T, Shumate J, Scampavia L, Spicer TP. A Rapid Phenotypic Whole-Cell Screening Approach for the Identification of Small-Molecule Inhibitors That Counter β-Lactamase Resistance in Pseudomonas aeruginosa. SLAS DISCOVERY 2017; 23:55-64. [PMID: 28850797 DOI: 10.1177/2472555217728489] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Pseudomonas aeruginosa is an opportunistic human pathogen that is prevalent in hospitals and continues to develop resistance to multiple classes of antibiotics. Historically, β-lactam antibiotics have been the first line of therapeutic defense. However, the emergence of multidrug-resistant (MDR) strains of P. aeruginosa, such as AmpC β-lactamase overproducing mutants, limits the effectiveness of current antibiotics. Among AmpC hyperproducing clinical isolates, inactivation of AmpG, which is essential for the expression of AmpC, increases bacterial sensitivity to β-lactam antibiotics. We hypothesize that inhibition of AmpG activity will enhance the efficacy of β-lactams against P. aeruginosa. Here, using a highly drug-resistant AmpC-inducible laboratory strain PAO1, we describe an ultra-high-throughput whole-cell turbidity assay designed to identify small-molecule inhibitors of the AmpG. We screened 645,000 compounds to identify compounds with the ability to inhibit bacterial growth in the presence of cefoxitin, an AmpC inducer, and identified 2663 inhibitors that were also tested in the absence of cefoxitin to determine AmpG specificity. The Z' and signal-to-background ratio were robust at 0.87 ± 0.05 and 2.2 ± 0.2, respectively. Through a series of secondary and tertiary studies, including a novel luciferase-based counterscreen, we ultimately identified eight potential AmpG-specific inhibitors.
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Affiliation(s)
- Deanna Collia
- 1 The Scripps Research Institute Molecular Screening Center, Department of Molecular Medicine, Scripps Florida, Jupiter, FL, USA
| | | | - Hao Tan
- 3 Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Shouguang Jin
- 3 Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Taimour Langaee
- 4 Department of Pharmacotherapy and Translational Research, Center for Pharmacogenomics, College of Pharmacy, University of Florida, Gainesville, FL, USA
| | - Justin Shumate
- 1 The Scripps Research Institute Molecular Screening Center, Department of Molecular Medicine, Scripps Florida, Jupiter, FL, USA
| | - Louis Scampavia
- 1 The Scripps Research Institute Molecular Screening Center, Department of Molecular Medicine, Scripps Florida, Jupiter, FL, USA
| | - Timothy P Spicer
- 1 The Scripps Research Institute Molecular Screening Center, Department of Molecular Medicine, Scripps Florida, Jupiter, FL, USA
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Lee AHY, Flibotte S, Sinha S, Paiero A, Ehrlich RL, Balashov S, Ehrlich GD, Zlosnik JEA, Mell JC, Nislow C. Phenotypic diversity and genotypic flexibility of Burkholderia cenocepacia during long-term chronic infection of cystic fibrosis lungs. Genome Res 2017; 27:650-662. [PMID: 28325850 PMCID: PMC5378182 DOI: 10.1101/gr.213363.116] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 02/16/2017] [Indexed: 11/24/2022]
Abstract
Chronic bacterial infections of the lung are the leading cause of morbidity and mortality in cystic fibrosis patients. Tracking bacterial evolution during chronic infections can provide insights into how host selection pressures—including immune responses and therapeutic interventions—shape bacterial genomes. We carried out genomic and phenotypic analyses of 215 serially collected Burkholderia cenocepacia isolates from 16 cystic fibrosis patients, spanning a period of 2–20 yr and a broad range of epidemic lineages. Systematic phenotypic tests identified longitudinal bacterial series that manifested progressive changes in liquid media growth, motility, biofilm formation, and acute insect virulence, but not in mucoidy. The results suggest that distinct lineages follow distinct evolutionary trajectories during lung infection. Pan-genome analysis identified 10,110 homologous gene clusters present only in a subset of strains, including genes restricted to different molecular types. Our phylogenetic analysis based on 2148 orthologous gene clusters from all isolates is consistent with patient-specific clades. This suggests that initial colonization of patients was likely by individual strains, followed by subsequent diversification. Evidence of clonal lineages shared by some patients was observed, suggesting inter-patient transmission. We observed recurrent gene losses in multiple independent longitudinal series, including complete loss of Chromosome III and deletions on other chromosomes. Recurrently observed loss-of-function mutations were associated with decreases in motility and biofilm formation. Together, our study provides the first comprehensive genome-phenome analyses of B. cenocepacia infection in cystic fibrosis lungs and serves as a valuable resource for understanding the genomic and phenotypic underpinnings of bacterial evolution.
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Affiliation(s)
- Amy Huei-Yi Lee
- Department of Microbiology and Immunology.,Department of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Stephane Flibotte
- Department of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.,Department of Zoology, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Sunita Sinha
- Department of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Adrianna Paiero
- Department of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Rachel L Ehrlich
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA.,Genomics Core Facility, Clinical and Translational Research Institute, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA.,Center for Genomic Sciences, Institute for Molecular Medicine and Infection Diseases, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA
| | - Sergey Balashov
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA.,Genomics Core Facility, Clinical and Translational Research Institute, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA.,Center for Genomic Sciences, Institute for Molecular Medicine and Infection Diseases, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA
| | - Garth D Ehrlich
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA.,Genomics Core Facility, Clinical and Translational Research Institute, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA.,Center for Genomic Sciences, Institute for Molecular Medicine and Infection Diseases, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA
| | - James E A Zlosnik
- Centre for Preventing and Understanding Infection in Children, BC Children's Hospital, University of British Columbia, Vancouver, British Columbia V5Z 4H4, Canada
| | - Joshua Chang Mell
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA.,Genomics Core Facility, Clinical and Translational Research Institute, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA.,Center for Genomic Sciences, Institute for Molecular Medicine and Infection Diseases, Drexel University College of Medicine, Philadelphia, Pennsylvania 19102, USA
| | - Corey Nislow
- Department of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
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Morales-Espinosa R, Delgado G, Espinosa LF, Isselo D, Méndez JL, Rodriguez C, Miranda G, Cravioto A. Fingerprint Analysis and Identification of Strains ST309 as a Potential High Risk Clone in a Pseudomonas aeruginosa Population Isolated from Children with Bacteremia in Mexico City. Front Microbiol 2017; 8:313. [PMID: 28298909 PMCID: PMC5331068 DOI: 10.3389/fmicb.2017.00313] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 02/15/2017] [Indexed: 11/13/2022] Open
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen and is associated with nosocomial infections. Its ability to thrive in a broad range of environments is due to a large and diverse genome of which its accessory genome is part. The objective of this study was to characterize P. aeruginosa strains isolated from children who developed bacteremia, using pulse-field gel electrophoresis, and in terms of its genomic islands, virulence genes, multilocus sequence type, and antimicrobial susceptibility. Our results showed that P. aeruginosa strains presented the seven virulence genes: toxA, lasB, lecA, algR, plcH, phzA1, and toxR, a type IV pilin alleles (TFP) group I or II. Additionally, we detected a novel pilin and accessory gene, expanding the number of TFP alleles to group VI. All strains presented the PAPI-2 Island and the majority were exoU+ and exoS+ genotype. Ten percent of the strains were multi-drug resistant phenotype, 18% extensively drug-resistant, 68% moderately resistant and only 3% were susceptible to all the antimicrobial tested. The most prevalent acquired β-Lactamase was KPC. We identified a group of ST309 strains, as a potential high risk clone. Our finding also showed that the strains isolated from patients with bacteremia have important virulence factors involved in colonization and dissemination as: a TFP group I or II; the presence of the exoU gene within the PAPI-2 island and the presence of the exoS gene.
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Affiliation(s)
- Rosario Morales-Espinosa
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México Mexico City, Mexico
| | - Gabriela Delgado
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México Mexico City, Mexico
| | - Luis F Espinosa
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México Mexico City, Mexico
| | - Dassaev Isselo
- Servicio de Pediatría, Hospital Regional 36 San Alejandro, IMSS Puebla, Mexico
| | - José L Méndez
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México Mexico City, Mexico
| | - Cristina Rodriguez
- Laboratorio de Bacteriología, Facultad de Veterinaria y Zootecnia, Universidad Nacional Autónoma de México Mexico City, Mexico
| | - Guadalupe Miranda
- Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Unidad de Investigación en Epidemiología Hospitalaria Mexico City, Mexico
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Antimicrobial resistance and genomic rep-PCR fingerprints of Pseudomonas aeruginosa strains from animals on the background of the global population structure. BMC Vet Res 2017; 13:58. [PMID: 28222788 PMCID: PMC5319083 DOI: 10.1186/s12917-017-0977-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 02/15/2017] [Indexed: 01/07/2023] Open
Abstract
Background Pseudomonas aeruginosa is an important human opportunistic pathogen responsible for fatal nosocomial infections worldwide, and has emerged as a relevant animal pathogen. Treatment options are dramatically decreasing, due to antimicrobial resistance and the microorganism’s large versatile genome. Antimicrobial resistance profiles, serotype frequency and genomic profile of unrelated P. aeruginosa isolates of veterinary origin (n = 73), including domesticated, farm, zoo and wild animals mainly from Portugal were studied. The genomic profile, determined by DiversiLab system (Rep-PCR-based technique), was compared with the P. aeruginosa global population structure to evaluate their relatedness. Results Around 40% of the isolates expressed serotypes O6 (20.5%) and O1 (17.8%). A total of 46.6% of isolates was susceptible to all antimicrobials tested. Isolates obtained from most animals were non-multidrug resistant (86.3%), whereas 11% were multidrug resistant, MDR (non-susceptible to at least one agent in ≥ three antimicrobial categories), and 2.7% extensively drug resistant, XDR (non-susceptible to at least one agent in all but two or fewer antimicrobial categories). Resistance percentages were as follows: amikacin (0.0%), aztreonam (41.1%), cefepime (9.6%), ceftazidime (2.7%), ciprofloxacin (15.1%), colistin (0.0%), gentamicin (12.3%), imipenem (1.4%), meropenem (1.4%), piperacillin + tazobactam (12.3%), ticarcillin (16.4%), ticarcillin + clavulanic acid (17.8%), and tobramycin (1.4%). Animal isolates form a population with a non-clonal epidemic structure indistinguishable from the global P. aeruginosa population structure, where no specific ‘animal clonal lineage’ was detected. Conclusions Serotypes O6 and O1 were the most frequent. Serotype frequency and antimicrobial resistance patterns found in P. aeruginosa from animals were as expected for this species. This study confirms earlier results that P. aeruginosa has a non-clonal population structure, and shows that P. aeruginosa population from animals is homogeneously scattered and indistinguishable from the global population structure. Electronic supplementary material The online version of this article (doi:10.1186/s12917-017-0977-8) contains supplementary material, which is available to authorized users.
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Sala-Comorera L, Blanch AR, Vilaró C, Galofré B, García-Aljaro C. Pseudomonas-related populations associated with reverse osmosis in drinking water treatment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2016; 182:335-341. [PMID: 27497310 DOI: 10.1016/j.jenvman.2016.07.089] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 07/21/2016] [Accepted: 07/28/2016] [Indexed: 06/06/2023]
Abstract
Reverse osmosis membrane filtration technology (RO) is used to treat drinking water. After RO treatment, bacterial growth is still observed in water. However, it is not clear whether those microorganisms belong to species that can pose a health risk, such as Pseudomonas spp. The goal of this study is to characterize the bacterial isolates from a medium that is selective for Pseudomonas and Aeromonas which were present in the water fraction before and after the RO. To this end, isolates were recovered over two years and were identified by matrix-assisted laser desorption/ionization-time of flight mass spectrometry. They were then biochemically phenotyped and the population similarity indexes were calculated. The isolates were analysed for their capacity to form biofilms in vitro and antimicrobial susceptibility. There were significant differences between the microbial populations in water before and after RO. Furthermore, the structures of the populations analysed at the same sampling point were similar in different sampling campaigns. Some of the isolates had the capacity to form a biofilm and showed resistance to different antibiotics. A successful level filtration via RO and subsequent recolonization of the membrane with different species from those in the feed water was found. Pseudomonas aeruginosa was not recovered from among the isolates. This study increases the knowledge on the microorganisms present in water after RO treatment, with focus in one of the genus causing problems in RO systems associated with human health risk, Pseudomonas.
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Affiliation(s)
- Laura Sala-Comorera
- Department of Microbiology, Faculty of Biology, University of Barcelona, Av. Diagonal 643, 08028 Barcelona, Spain
| | - Anicet R Blanch
- Department of Microbiology, Faculty of Biology, University of Barcelona, Av. Diagonal 643, 08028 Barcelona, Spain
| | - Carles Vilaró
- Aigües de Barcelona, EMGCIA, C/ General Batet 1-7, 08028 Barcelona, Spain
| | - Belén Galofré
- Aigües de Barcelona, EMGCIA, C/ General Batet 1-7, 08028 Barcelona, Spain
| | - Cristina García-Aljaro
- Department of Microbiology, Faculty of Biology, University of Barcelona, Av. Diagonal 643, 08028 Barcelona, Spain.
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Environmentally Endemic Pseudomonas aeruginosa Strains with Mutations in lasR Are Associated with Increased Disease Severity in Corneal Ulcers. mSphere 2016; 1:mSphere00140-16. [PMID: 27631025 PMCID: PMC5014915 DOI: 10.1128/msphere.00140-16] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 08/13/2016] [Indexed: 01/06/2023] Open
Abstract
The Steroids for Corneal Ulcers Trial (SCUT) was a multicenter, international study of bacterial keratitis in which 101 Pseudomonas aeruginosa infections were treated. Twenty-two of 101 P. aeruginosa isolates collected had a colony morphology characteristic of a loss-of-function mutation in lasR, the gene encoding a quorum-sensing master regulator. Ulcers caused by these 22 strains were associated with larger areas of corneal opacification, worse vision, and a lower rate of vision recovery in response to treatment than ulcers caused by the other isolates. The lasR sequences from these isolates each contained one of three nonsynonymous substitutions, and these strains were deficient in production of LasR-regulated protease and rhamnolipids. Replacement of lasR with either of the two most common lasR alleles from the SCUT isolates was sufficient to decrease protease and rhamnolipid production in PA14. Loss of LasR function is associated with increased production of CupA fimbriae, and the LasR-defective isolates exhibited higher production of CupA fimbriae than LasR-intact isolates. Strains with the same lasR mutation were of the same multilocus sequence type, suggesting that LasR-deficient, environmental P. aeruginosa strains were endemic to the area, and infections caused by these strains were associated with worse patient outcomes in the SCUT study. (This study has been registered at ClinicalTrials.gov under registration no. NCT00324168.) IMPORTANCE The LasR transcription factor is an important regulator of quorum sensing in P. aeruginosa and positively controls multiple virulence-associated pathways. The emergence of strains with lasR loss-of-function alleles in chronic disease is well described and is thought to represent a specific adaptation to the host environment. However, the prevalence and virulence of these strains in acute infections remain unclear. This report describes observations revealing that lasR mutants were common among isolates from a large, multicenter clinical study of keratitis and were associated with worse clinical outcomes than LasR-intact strains despite reduced production of LasR-regulated factors. Additionally, these lasR mutants were closely related strains or clones, as determined by molecular analysis. Because bacterial keratitis is community acquired, these data indicate infection by endemic, LasR-deficient strains in the environment. These results suggest that the conventional paradigm regarding the role for LasR-mediated regulation of virulence is more complex than previously appreciated.
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Magalhães MJTL, Pontes G, Serra PT, Balieiro A, Castro D, Pieri FA, Crainey JL, Nogueira PA, Orlandi PP. Multidrug resistant Pseudomonas aeruginosa survey in a stream receiving effluents from ineffective wastewater hospital plants. BMC Microbiol 2016; 16:193. [PMID: 27558582 PMCID: PMC4995675 DOI: 10.1186/s12866-016-0798-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 08/03/2016] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Multi-drug resistant forms of Pseudomonas aeruginosa (MDRPA) are a major source of nosocomial infections and when discharged into streams and rivers from hospital wastewater treatment plants (HWWTP) they are known to be able to persist for extended periods. In the city of Manaus (Western Brazilian Amazon), the effluent of three HWWTPs feed into the urban Mindu stream which crosses the city from its rainforest source before draining into the Rio Negro. The stream is routinely used by Manaus residents for bathing and cleaning (of clothes as well as domestic utensils) and, during periods of flooding, can contaminate wells used for drinking water. RESULTS 16S rRNA metagenomic sequence analysis of 293 cloned PCR fragments, detected an abundance of Pseudomonas aeruginosa (P. aeruginosa) at the stream's Rio Negro drainage site, but failed to detect it at the stream's source. An array of antimicrobial resistance profiles and resistance to all 14 tested antimicrobials was detected among P. aeruginosa cultures prepared from wastewater samples taken from water entering and being discharged from a Manaus HWWTP. Just one P. aeruginosa antimicrobial resistance profile, however, was detected from cultures made from Mindu stream isolates. Comparisons made between P. aeruginosa isolates' genomic DNA restriction enzyme digest fingerprints, failed to determine if any of the P. aeruginosa found in the Mindu stream were of HWWTP origin, but suggested that Mindu stream P. aeruginosa are from diverse origins. Culturing experiments also showed that P. aeruginosa biofilm formation and the extent of biofilm formation produced were both significantly higher in multi drug resistant forms of P. aeruginosa. CONCLUSIONS Our results show that a diverse range of MDRPA are being discharged in an urban stream from a HWWTP in Manaus and that P. aeruginosa strains with ampicillin and amikacin can persist well within it.
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Affiliation(s)
| | - Gemilson Pontes
- Instituto Nacional de Pesquisa da Amazônia - INPA, 2936 André Araújo Av, 69060-001, Manaus, AM, Brazil
| | - Paula Takita Serra
- Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil
| | - Antonio Balieiro
- Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil
| | - Diogo Castro
- Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil
| | - Fabio Alessandro Pieri
- Departamento Básico - Área de Saúde; Campus Governador Valadares, Universidade Federal de Juiz de Fora, Rua Israel Pinheiro, 2000, Bairro Universitário, Governador Valadares, MG, Brazil
| | - James Lee Crainey
- Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil
| | - Paulo Afonso Nogueira
- Programa de Pós-Graduação Sociedade e Endemias na Amazônia, ILMD, 476, Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil.,Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil
| | - Patricia Puccinelli Orlandi
- Programa de Pós-Graduação Sociedade e Endemias na Amazônia, ILMD, 476, Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil. .,Instituto de Pesquisa Leônidas e Maria Deane - FIOCRUZ AMAZONIA, 476 Teresina St, Adrianópolis, 69057-070, Manaus, AM, Brazil.
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Jagmann N, Bleicher V, Busche T, Kalinowski J, Philipp B. The guanidinobutyrase GbuA is essential for the alkylquinolone-regulated pyocyanin production during parasitic growth of Pseudomonas aeruginosa in co-culture with Aeromonas hydrophila. Environ Microbiol 2016; 18:3550-3564. [PMID: 27322205 DOI: 10.1111/1462-2920.13419] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 06/15/2016] [Indexed: 11/30/2022]
Abstract
The opportunistic pathogen Pseudomonas aeruginosa controls the production of virulence factors by quorum sensing (QS). Besides cell density, QS in P. aeruginosa is co-regulated by metabolic influences, especially nutrient limitation. Previously, a co-culture model system was established consisting of P. aeruginosa and the chitinolytic bacterium Aeromonas hydrophila, in which parasitic growth of P. aeruginosa is strictly dependent on the QS-controlled production of pyocyanin in response to nutrient limitation (Jagmann et al., ). In this study, the co-culture was employed to identify novel genes involved in the regulation of pyocyanin production. Via transposon mutagenesis, the gene gbuA encoding a guanidinobutyrase was identified, deletion of which led to a loss of pyocyanin production in co-cultures and to a reduced pyocyanin production in single cultures. Addition of the natural substrate of GbuA to the mutant strain enhanced the negative effect on pyocyanin production in single cultures. The gbuA mutant showed a reduced transcription of the pqsABCDE operon and could be complemented by PqsE overexpression and addition of alkylquinolone signal molecules. The strong effect of gbuA deletion on the QS-controlled pyocyanin production in co-cultures showed the value of this approach for the discovery of novel gene functions linking metabolism and QS in P. aeruginosa.
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Affiliation(s)
- Nina Jagmann
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität (WWU) Münster, Corrensstr. 3, Münster, 48149, Germany
| | - Vera Bleicher
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität (WWU) Münster, Corrensstr. 3, Münster, 48149, Germany
| | - Tobias Busche
- Center for Biotechnology (CeBiTec), Universität Bielefeld, Universitätsstr. 25, Bielefeld, 33615, Germany
| | - Jörn Kalinowski
- Center for Biotechnology (CeBiTec), Universität Bielefeld, Universitätsstr. 25, Bielefeld, 33615, Germany
| | - Bodo Philipp
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität (WWU) Münster, Corrensstr. 3, Münster, 48149, Germany.
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42
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Cigana C, Melotti P, Baldan R, Pedretti E, Pintani E, Iansa P, De Fino I, Favari F, Bergamini G, Tridello G, Cirillo DM, Assael BM, Bragonzi A. Genotypic and phenotypic relatedness of Pseudomonas aeruginosa isolates among the major cystic fibrosis patient cohort in Italy. BMC Microbiol 2016; 16:142. [PMID: 27400750 PMCID: PMC4940697 DOI: 10.1186/s12866-016-0760-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Accepted: 07/02/2016] [Indexed: 01/06/2023] Open
Abstract
Background Pseudomonas aeruginosa is the predominant pathogen associated with the decline of pulmonary function in cystic fibrosis (CF) patients. Both environment-to-host acquisition and patient-to-patient transmission have been described for P. aeruginosa infection. Epidemic clones and bacterial phenotypic adaptation to the CF lung have been recognised as independent risk factors for disease progression. So far, there is no established link between genotypic prevalence and phenotypic traits. Here, we look at the major CF patient cohort in Italy to identify shared P. aeruginosa clones and associated common phenotypic traits. Results A comprehensive analysis of P. aeruginosa genotypes to determine the presence of high-risk shared clones and their association to specific phenotypic traits has been performed in a major Italian CF centre. Pulsed-field gel electrophoresis (PFGE) of P. aeruginosa isolates from 338 CF subjects identified 43 profiles shared by two or more patients and 214 profiles exclusive to individual patients. There was no evidence of a P. aeruginosa outbreak, but four most prevalent pulsotypes were detected. Common phenotypic traits were recorded intra-pulsotypes, but we detected heterogeneity inter-pulsotypes. Two of the four major pulsotypes included P. aeruginosa isolates with hallmarks of adaptation to the CF airways, including loss of motility, low production of siderophore, pyocyanin and proteases, and antibiotic resistance. One of these pulsotypes grouped a high percentage of hypermutable isolates. No clear correlation between epidemiological and clinical data was found. Conclusions We conclude that CF patients of this cohort shared common pulsotypes, but their phenotypic heterogeneity indicates an absence of specific traits associated to P. aeruginosa genotypic prevalence. Electronic supplementary material The online version of this article (doi:10.1186/s12866-016-0760-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Cristina Cigana
- Infections and Cystic Fibrosis Unit, Division of Immunology, Transplantation and Infectious Diseases, IRCCS San Raffaele Scientific Institute, via Olgettina 58, 20132, Milan, Italy.
| | - Paola Melotti
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata di Verona, piazzale Stefani 1, 37126, Verona, Italy
| | - Rossella Baldan
- Emerging Bacterial Pathogens Unit, Division of Immunology, Transplantation and Infectious Diseases, IRCCS San Raffaele Scientific Institute, via Olgettina 58, 20132, Milan, Italy
| | - Elisa Pedretti
- Infections and Cystic Fibrosis Unit, Division of Immunology, Transplantation and Infectious Diseases, IRCCS San Raffaele Scientific Institute, via Olgettina 58, 20132, Milan, Italy
| | - Emily Pintani
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata di Verona, piazzale Stefani 1, 37126, Verona, Italy
| | - Patrizia Iansa
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata di Verona, piazzale Stefani 1, 37126, Verona, Italy
| | - Ida De Fino
- Infections and Cystic Fibrosis Unit, Division of Immunology, Transplantation and Infectious Diseases, IRCCS San Raffaele Scientific Institute, via Olgettina 58, 20132, Milan, Italy
| | - Flavio Favari
- Microbiology and Virology Unit, Department of Pathology, Azienda Ospedaliera Universitaria Integrata di Verona, piazzale Stefani 1, 37126, Verona, Italy
| | - Gabriella Bergamini
- Department of Pathology and Diagnostics, University of Verona, Strada le Grazie 8, 37134, Verona, Italy
| | - Gloria Tridello
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata di Verona, piazzale Stefani 1, 37126, Verona, Italy
| | - Daniela M Cirillo
- Emerging Bacterial Pathogens Unit, Division of Immunology, Transplantation and Infectious Diseases, IRCCS San Raffaele Scientific Institute, via Olgettina 58, 20132, Milan, Italy
| | - Baroukh M Assael
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata di Verona, piazzale Stefani 1, 37126, Verona, Italy
| | - Alessandra Bragonzi
- Infections and Cystic Fibrosis Unit, Division of Immunology, Transplantation and Infectious Diseases, IRCCS San Raffaele Scientific Institute, via Olgettina 58, 20132, Milan, Italy.
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43
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Zhou Z, Hu B, Gao X, Bao R, Chen M, Li H. Sources of sporadic Pseudomonas aeruginosa colonizations/infections in surgical ICUs: Association with contaminated sink trap. J Infect Chemother 2016; 22:450-5. [PMID: 27184934 DOI: 10.1016/j.jiac.2016.03.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 03/01/2016] [Accepted: 03/31/2016] [Indexed: 11/16/2022]
Abstract
BACKGROUND Many studies have reported the hospital outbreaks of Pseudomonas aeruginosa due to cross-contamination between patients and water fittings, but the importance of water fittings as sources of sporadic P. aeruginosa colonizations/infections remains ambiguous. AIM To investigate the sources of sporadic P. aeruginosa colonizations/infections in a clinical intensive surveillance, and further analysis the potential of sink trap for P. aeruginosa transmission in intensive care units (ICUs). METHODS Patients monitoring and targeted environmental screening for P. aeruginosa was performed prospectively over a 27-week period, in absence of recognized outbreak, in two surgical intensive care units (SICUs). All isolates were genotyped by Pulsed field gel electrophoresis analysis. FINDINGS 18.9% (46/244) of water fitting samples harbored P. aeruginosa, and active screening samples from 9.2% (55/595) of hospitalized patients carried with P. aeruginosa. According to genotype results, approximately 50% of P. areuginosa colonizations/infections of patients were of exogenous origin. 64.7% (11/17) of exogenous sourced cases were associated with contaminated sink traps. There was a significant correlation between the incidence of exogenous colonization/infection and the prevalence of P. areuginosa in water fitting in SICU-2 (rs = 0.972; p = 0.014). Furthermore, P. areuginosa from sink trap possessed a higher level of resistance to multi-antibiotics as opposed to cross-transmission from other patients. CONCLUSION Water fitting especially sink trap act as an important role in sporadic P. aeruginosa transmission in SICU patients. This report highlights the necessity of identification of potential environmental reservoirs, such as sinks, for control of infections of environmentally hardy multi-resistant P. areuginosa.
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Affiliation(s)
- ZhaoYan Zhou
- Clinical Microbiology Laboratory, Department of Respiratory Disease, Zhongshan Hospital of Fudan University, Shanghai, China
| | - BiJie Hu
- Department of Infection Control, Zhongshan Hospital of Fudan University, Shanghai, China.
| | - XiaoDong Gao
- Department of Infection Control, Zhongshan Hospital of Fudan University, Shanghai, China
| | - Rong Bao
- Clinical Microbiology Laboratory, Department of Respiratory Disease, Zhongshan Hospital of Fudan University, Shanghai, China
| | - Min Chen
- Laboratory of Microbiology, Shanghai Municipal Center for Disease Control & Prevention, Shanghai, China
| | - HuaYin Li
- Clinical Microbiology Laboratory, Department of Respiratory Disease, Zhongshan Hospital of Fudan University, Shanghai, China
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44
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Saiman L, Siegel JD, LiPuma JJ, Brown RF, Bryson EA, Chambers MJ, Downer VS, Fliege J, Hazle LA, Jain M, Marshall BC, O’Malley C, Pattee SR, Potter-Bynoe G, Reid S, Robinson KA, Sabadosa KA, Schmidt HJ, Tullis E, Webber J, Weber DJ. Infection Prevention and Control Guideline for Cystic Fibrosis: 2013 Update. Infect Control Hosp Epidemiol 2016; 35 Suppl 1:S1-S67. [DOI: 10.1086/676882] [Citation(s) in RCA: 270] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The 2013 Infection Prevention and Control (IP&C) Guideline for Cystic Fibrosis (CF) was commissioned by the CF Foundation as an update of the 2003 Infection Control Guideline for CF. During the past decade, new knowledge and new challenges provided the following rationale to develop updated IP&C strategies for this unique population:1.The need to integrate relevant recommendations from evidence-based guidelines published since 2003 into IP&C practices for CF. These included guidelines from the Centers for Disease Control and Prevention (CDC)/Healthcare Infection Control Practices Advisory Committee (HICPAC), the World Health Organization (WHO), and key professional societies, including the Infectious Diseases Society of America (IDSA) and the Society for Healthcare Epidemiology of America (SHEA). During the past decade, new evidence has led to a renewed emphasis on source containment of potential pathogens and the role played by the contaminated healthcare environment in the transmission of infectious agents. Furthermore, an increased understanding of the importance of the application of implementation science, monitoring adherence, and feedback principles has been shown to increase the effectiveness of IP&C guideline recommendations.2.Experience with emerging pathogens in the non-CF population has expanded our understanding of droplet transmission of respiratory pathogens and can inform IP&C strategies for CF. These pathogens include severe acute respiratory syndrome coronavirus and the 2009 influenza A H1N1. Lessons learned about preventing transmission of methicillin-resistantStaphylococcus aureus(MRSA) and multidrug-resistant gram-negative pathogens in non-CF patient populations also can inform IP&C strategies for CF.
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45
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Fischer S, Klockgether J, Morán Losada P, Chouvarine P, Cramer N, Davenport CF, Dethlefsen S, Dorda M, Goesmann A, Hilker R, Mielke S, Schönfelder T, Suerbaum S, Türk O, Woltemate S, Wiehlmann L, Tümmler B. Intraclonal genome diversity of the major Pseudomonas aeruginosa clones C and PA14. ENVIRONMENTAL MICROBIOLOGY REPORTS 2016; 8:227-234. [PMID: 26711897 PMCID: PMC4819714 DOI: 10.1111/1758-2229.12372] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 12/16/2015] [Indexed: 06/05/2023]
Abstract
Bacterial populations differentiate at the subspecies level into clonal complexes. Intraclonal genome diversity was studied in 100 isolates of the two dominant Pseudomonas aeruginosa clones C and PA14 collected from the inanimate environment, acute and chronic infections. The core genome was highly conserved among clone members with a median pairwise within-clone single nucleotide sequence diversity of 8 × 10(-6) for clone C and 2 × 10(-5) for clone PA14. The composition of the accessory genome was, on the other hand, as variable within the clone as between unrelated clones. Each strain carried a large cargo of unique genes. The two dominant worldwide distributed P. aeruginosa clones combine an almost invariant core with the flexible gain and loss of genetic elements that spread by horizontal transfer.
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Affiliation(s)
- Sebastian Fischer
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Jens Klockgether
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Patricia Morán Losada
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Philippe Chouvarine
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Nina Cramer
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Colin F Davenport
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Sarah Dethlefsen
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Marie Dorda
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Alexander Goesmann
- Bioinformatics and Systems Biology, Justus-Liebig-Universität, Gießen, Germany
| | - Rolf Hilker
- Bioinformatics and Systems Biology, Justus-Liebig-Universität, Gießen, Germany
| | - Samira Mielke
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Torben Schönfelder
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Sebastian Suerbaum
- Institute for Medical Microbiology and Hospital Epidemiology, OE 5210, Hannover Medical School, Hannover, Germany
| | - Oliver Türk
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Sabrina Woltemate
- Institute for Medical Microbiology and Hospital Epidemiology, OE 5210, Hannover Medical School, Hannover, Germany
| | - Lutz Wiehlmann
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
| | - Burkhard Tümmler
- Clinical Research Group 'Molecular Pathology of Cystic Fibrosis and Pseudomonas Genomics', OE 6710, Hannover Medical School, Hannover, Germany
- Biomedical Research in Endstage and Obstructive Lung Disease (BREATH), German Center for Lung Research, Hannover, Germany
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46
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Lee C, Wigren E, Lünsdorf H, Römling U. Protein homeostasis-more than resisting a hot bath. Curr Opin Microbiol 2016; 30:147-154. [PMID: 26974352 DOI: 10.1016/j.mib.2016.02.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 02/10/2016] [Accepted: 02/22/2016] [Indexed: 12/13/2022]
Abstract
Maintenance of protein homeostasis is essential for survival of all organisms. In bacteria, the protein quality control system has a broad physiological impact beyond heat shock resistance, being involved in virulence, antibiotic resistance, as well as protection against environmental stresses. Its contribution to rejuvenation and growth arrest suggests interference with protein quality control to be a novel antimicrobial strategy. Remarkably, a protein quality control module originating from environmental strains has been found to be horizontally transferred to predominant clonal groups of bacteria providing exquisite thermotolerance to recently emerged global pathogens suggesting that novel features related to protein homeostasis contribute to the transition to new environments.
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Affiliation(s)
- Changhan Lee
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm 171 77, Sweden.
| | - Edvard Wigren
- Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm 171 77, Sweden
| | - Heinrich Lünsdorf
- The Helmholtz Center for Infection Research, Braunschweig 38124, Germany
| | - Ute Römling
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm 171 77, Sweden.
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47
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Masoud-Landgraf L, Zarfel G, Kaschnigg T, Friedl S, Feierl G, Wagner-Eibel U, Eber E, Grisold AJ, Kittinger C. Analysis and Characterization of Staphylococcus aureus Small Colony Variants Isolated From Cystic Fibrosis Patients in Austria. Curr Microbiol 2016; 72:606-11. [PMID: 26821237 PMCID: PMC4828482 DOI: 10.1007/s00284-016-0994-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 12/15/2015] [Indexed: 01/07/2023]
Abstract
Cystic fibrosis (CF) is the most common hereditary lung disease in the Caucasian population, characterized by viscous bronchial secretion, consecutive defective mucociliary clearance, and unavoidable colonization with microorganisms. Besides Pseudomonas aeruginosa, Staphylococcus aureus is the most common bacterial species colonizing the CF respiratory tract. Under antibiotic pressure S. aureus is able to switch to small colony variants (SCV). These small colony variants can invade epithelial cells, overcome antibiotic therapy inside the cells and can be the starting point for extracellular recolonization. The aim of the present study was the isolation and characterization of S. aureus small colony variants from Austrian cystic fibrosis patients. Samples collected from 147 patients were screened for the presence of S. aureus wild-type and small colony variants. Antibiotic susceptibility testing and determination of the small colony variants causing auxotrophism were performed. Wild-type isolates were assigned to corresponding small colony variants with spa typing. In total, 17 different small colony variant isolates and 12 corresponding wild-type isolates were obtained. 13 isolates were determined thymidine auxotroph, 2 isolates were auxotroph for hemin, and none of the tested isolates was auxotroph for both, respectively. The presence of SCVs is directly related to a poor clinical outcome, therefore a monitoring of SCV prevalence is recommended. This study revealed rather low SCV ratios in CF patients compared to other countries.
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Affiliation(s)
- Lilian Masoud-Landgraf
- Institute of Hygiene, Microbiology and Environmental Medicine, Medical University Graz, Neue Stiftingtalstraße 2, 8010, Graz, Austria
| | - Gernot Zarfel
- Institute of Hygiene, Microbiology and Environmental Medicine, Medical University Graz, Neue Stiftingtalstraße 2, 8010, Graz, Austria
| | - Tanja Kaschnigg
- Institute of Hygiene, Microbiology and Environmental Medicine, Medical University Graz, Neue Stiftingtalstraße 2, 8010, Graz, Austria
| | - Simone Friedl
- Institute of Hygiene, Microbiology and Environmental Medicine, Medical University Graz, Neue Stiftingtalstraße 2, 8010, Graz, Austria
| | - Gebhard Feierl
- Institute of Hygiene, Microbiology and Environmental Medicine, Medical University Graz, Neue Stiftingtalstraße 2, 8010, Graz, Austria
| | - Ute Wagner-Eibel
- Institute of Hygiene, Microbiology and Environmental Medicine, Medical University Graz, Neue Stiftingtalstraße 2, 8010, Graz, Austria
| | - Ernst Eber
- Department of Paediatrics and Adolescent Medicine, Medical University of Graz, Graz, Austria
| | - Andrea J Grisold
- Institute of Hygiene, Microbiology and Environmental Medicine, Medical University Graz, Neue Stiftingtalstraße 2, 8010, Graz, Austria
| | - Clemens Kittinger
- Institute of Hygiene, Microbiology and Environmental Medicine, Medical University Graz, Neue Stiftingtalstraße 2, 8010, Graz, Austria.
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48
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Ferreira AG, Leão RS, Carvalho-Assef APD, da Silva ÉADSR, Firmida MDC, Folescu TW, Paixão VA, Santana MA, de Abreu e Silva FA, Barth AL, Marques EA. Low-level resistance and clonal diversity of Pseudomonas aeruginosa among chronically colonized cystic fibrosis patients. APMIS 2015; 123:1061-8. [PMID: 26522829 DOI: 10.1111/apm.12463] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Accepted: 09/18/2015] [Indexed: 02/02/2023]
Abstract
A prospective study was conducted in Brazil to evaluate antimicrobial resistance patterns and molecular epidemiology of Pseudomonas aeruginosa isolates from cystic fibrosis (CF) patients with chronic lung infection. All isolates were obtained between May 2009 and June 2010 from 75 patients seen in four reference centers in Brazil: HCPA (20 patients) and HEOM (15 patients), located in southern and northeastern Brazil, respectively; IFF (20 patients) and HUPE (20 patients), both in southwestern Brazil. Antimicrobial susceptibility testing, PCR for detection of carpapenemases, and pulsed-field gel electrophoresis (PFGE) were performed in 274 isolates. A total of 224 PFGE types were identified and no clones were found circulating among the centers or within the same center. Despite the chronic infection, most patients were colonized by intermittent clones. Only three patients (4%) maintained the same clone during the study. The resistance rates were lower than 30% for the majority of antimicrobials tested in all centers and only 17% of isolates were multiresistant. Isolates (n = 54) with reduced susceptibility to imipenem and/or meropenem presented negative results for blaSPM-1, blaIMP-1, blaVIM , and blaKPC genes. Our results indicate an unexpected low level of antimicrobial resistance and a high genotypic diversity among P. aeruginosa from Brazilian chronic CF patients.
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Affiliation(s)
- Alex Guerra Ferreira
- Disciplina de Microbiologia e Imunologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Boulevard 28 de Setembro, 87, fundos, Rio de Janeiro, RJ, Brazil
| | - Robson Souza Leão
- Disciplina de Microbiologia e Imunologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Boulevard 28 de Setembro, 87, fundos, Rio de Janeiro, RJ, Brazil
| | | | | | - Monica de Cássia Firmida
- Hospital Universitário Pedro Ernesto, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Tania Wrobel Folescu
- Instituto Fernandes Figueira, Fundação Instituto Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Vilma Almeida Paixão
- Serviço de Pneumologia, Hospital Especializado Octávio Mangabeira, Salvador, BA, Brazil
| | | | | | - Afonso Luís Barth
- Laboratório de Pesquisa em Resistência Bacteriana - Centro de Pesquisas Experimental Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Elizabeth Andrade Marques
- Disciplina de Microbiologia e Imunologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Boulevard 28 de Setembro, 87, fundos, Rio de Janeiro, RJ, Brazil
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49
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Muller JF, Ghosh S, Ikuma K, Stevens AM, Love NG. Chlorinated phenol-induced physiological antibiotic resistance in Pseudomonas aeruginosa. FEMS Microbiol Lett 2015; 362:fnv172. [PMID: 26403431 DOI: 10.1093/femsle/fnv172] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/20/2015] [Indexed: 12/11/2022] Open
Abstract
Pseudomonas aeruginosa is a ubiquitous environmental bacterium and an opportunistic pathogen with the ability to rapidly develop multidrug resistance under selective pressure. Previous work demonstrated that upon exposure to the environmental contaminant pentachlorophenol (PCP), P. aeruginosa PAO1 increases expression of multiple multidrug efflux pumps, including the MexAB-OprM pump. The current study describes increases in the antibiotic resistance of PAO1 upon exposure to PCP and other chlorinated organics, including triclosan. Only exposure to chlorinated phenols induced the mexAB-oprM-mediated antibiotic-resistant phenotype. Thus, chlorinated phenols have the potential to contribute to transient phenotypic increases of antibiotic resistance that are relevant when both compounds are present in the environment.
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Affiliation(s)
- Jocelyn Fraga Muller
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061, USA
| | - Sudeshna Ghosh
- Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Kaoru Ikuma
- Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061, USA
| | - Ann M Stevens
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA 24061, USA
| | - Nancy G Love
- Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, MI 48109, USA
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50
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Benbow ME, Pechal JL, Lang JM, Erb R, Wallace JR. The Potential of High-throughput Metagenomic Sequencing of Aquatic Bacterial Communities to Estimate the Postmortem Submersion Interval. J Forensic Sci 2015; 60:1500-10. [DOI: 10.1111/1556-4029.12859] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 11/10/2014] [Accepted: 11/14/2014] [Indexed: 12/29/2022]
Affiliation(s)
- Mark Eric Benbow
- Department of Entomology; Michigan State University; East Lansing MI 48824
| | - Jennifer L. Pechal
- Department of Entomology; Michigan State University; East Lansing MI 48824
| | - Jennifer M. Lang
- Department of Biology; University of Dayton; Dayton OH 45469-2320
| | - Racheal Erb
- Department of Biology; Millersville University; Millersville PA 17551
| | - John R. Wallace
- Department of Biology; Millersville University; Millersville PA 17551
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