1
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Bridel S, Bouchez V, Brancotte B, Hauck S, Armatys N, Landier A, Mühle E, Guillot S, Toubiana J, Maiden MCJ, Jolley KA, Brisse S. A comprehensive resource for Bordetella genomic epidemiology and biodiversity studies. Nat Commun 2022; 13:3807. [PMID: 35778384 PMCID: PMC9249784 DOI: 10.1038/s41467-022-31517-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 06/21/2022] [Indexed: 11/09/2022] Open
Abstract
The genus Bordetella includes bacteria that are found in the environment and/or associated with humans and other animals. A few closely related species, including Bordetella pertussis, are human pathogens that cause diseases such as whooping cough. Here, we present a large database of Bordetella isolates and genomes and develop genotyping systems for the genus and for the B. pertussis clade. To generate the database, we merge previously existing databases from Oxford University and Institut Pasteur, import genomes from public repositories, and add 83 newly sequenced B. bronchiseptica genomes. The public database currently includes 2582 Bordetella isolates and their provenance data, and 2085 genomes ( https://bigsdb.pasteur.fr/bordetella/ ). We use core-genome multilocus sequence typing (cgMLST) to develop genotyping systems for the whole genus and for B. pertussis, as well as specific schemes to define antigenic, virulence and macrolide resistance profiles. Phylogenetic analyses allow us to redefine evolutionary relationships among known Bordetella species, and to propose potential new species. Our database provides an expandable resource for genotyping of environmental and clinical Bordetella isolates, thus facilitating evolutionary and epidemiological research on whooping cough and other Bordetella infections.
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Affiliation(s)
- Sébastien Bridel
- Institut Pasteur, Université Paris Cité, Biodiversity and Epidemiology of Bacterial Pathogens, Paris, France
| | - Valérie Bouchez
- Institut Pasteur, Université Paris Cité, Biodiversity and Epidemiology of Bacterial Pathogens, Paris, France.,National Reference Center for Whooping Cough and other Bordetella Infections, Institut Pasteur, Paris, France
| | - Bryan Brancotte
- Institut Pasteur, Université Paris Cité, Bioinformatics and Biostatistics Hub, F-75015, Paris, France
| | - Sofia Hauck
- Department of Zoology, University of Oxford, 11a Mansfield Road, Oxford, OX1 3SZ, UK
| | - Nathalie Armatys
- Institut Pasteur, Université Paris Cité, Biodiversity and Epidemiology of Bacterial Pathogens, Paris, France.,National Reference Center for Whooping Cough and other Bordetella Infections, Institut Pasteur, Paris, France
| | - Annie Landier
- Institut Pasteur, Université Paris Cité, Biodiversity and Epidemiology of Bacterial Pathogens, Paris, France.,National Reference Center for Whooping Cough and other Bordetella Infections, Institut Pasteur, Paris, France
| | - Estelle Mühle
- Collection de l´Institut Pasteur, Institut Pasteur, Université Paris Cité, Paris, France
| | - Sophie Guillot
- Institut Pasteur, Université Paris Cité, Biodiversity and Epidemiology of Bacterial Pathogens, Paris, France.,National Reference Center for Whooping Cough and other Bordetella Infections, Institut Pasteur, Paris, France
| | - Julie Toubiana
- Institut Pasteur, Université Paris Cité, Biodiversity and Epidemiology of Bacterial Pathogens, Paris, France.,National Reference Center for Whooping Cough and other Bordetella Infections, Institut Pasteur, Paris, France.,Department of General Pediatrics and Pediatric Infectious Diseases, Université Paris Cité, Hôpital Necker-Enfants Malades, APHP, Paris, France
| | - Martin C J Maiden
- Department of Zoology, University of Oxford, 11a Mansfield Road, Oxford, OX1 3SZ, UK
| | - Keith A Jolley
- Department of Zoology, University of Oxford, 11a Mansfield Road, Oxford, OX1 3SZ, UK
| | - Sylvain Brisse
- Institut Pasteur, Université Paris Cité, Biodiversity and Epidemiology of Bacterial Pathogens, Paris, France. .,National Reference Center for Whooping Cough and other Bordetella Infections, Institut Pasteur, Paris, France.
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2
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Dewan KK, Skarlupka AL, Rivera I, Cuff LE, Gestal MC, Taylor-Mulneix DL, Wagner S, Ryman VE, Rodriguez C, Hamidou Soumana I, Levin BR, Harvill ET. Development of macrolide resistance in Bordetella bronchiseptica is associated with the loss of virulence. J Antimicrob Chemother 2019; 73:2797-2805. [PMID: 30107601 DOI: 10.1093/jac/dky264] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2018] [Accepted: 06/07/2018] [Indexed: 01/30/2023] Open
Abstract
Background Why resistance to specific antibiotics emerges and spreads rapidly in some bacteria confronting these drugs but not others remains a mystery. Resistance to erythromycin in the respiratory pathogens Staphylococcus aureus and Streptococcus pneumoniae emerged rapidly and increased problematically. However, resistance is uncommon amongst the classic Bordetella species despite infections being treated with this macrolide for decades. Objectives We examined whether the apparent progenitor of the classic Bordetella spp., Bordetella bronchiseptica, is able to rapidly generate de novo resistance to antibiotics and, if so, why such resistance might not persist and propagate. Methods Independent strains of B. bronchiseptica resistant to erythromycin were generated in vitro by successively passaging them in increasing subinhibitory concentrations of this macrolide. Resistant mutants obtained were evaluated for their capacity to infect mice, and for other virulence properties including adherence, cytotoxicity and induction of cytokines. Results B. bronchiseptica rapidly developed stable and persistent antibiotic resistance de novo. Unlike the previously reported trade-off in fitness, multiple independent resistant mutants were not defective in their rates of growth in vitro but were consistently defective in colonizing mice and lost a variety of virulence phenotypes. These changes rendered them avirulent but phenotypically similar to the previously described growth phase associated with the ability to survive in soil, water and/or other extra-mammalian environments. Conclusions These observations raise the possibility that antibiotic resistance in some organisms results in trade-offs that are not quantifiable in routine measures of general fitness such as growth in vitro, but are pronounced in various aspects of infection in the natural host.
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Affiliation(s)
- Kalyan K Dewan
- Department of Infectious Diseases, Coverdell Center for Biomedical and Health Sciences, 500 D. W. Brooks Drive, University of Georgia, Athens, GA, USA
| | - Amanda L Skarlupka
- Graduate Program in Microbiology, University of Georgia, Athens, GA, USA
| | - Israel Rivera
- Graduate Program in Infectious Diseases, University of Georgia, Athens, GA, USA
| | - Laura E Cuff
- Center for Vaccines and Immunology, College of Veterinary Medicine, University of Georgia, 501 D. W. Brooks Drive, Athens, GA, USA
| | - Monica C Gestal
- Department of Infectious Diseases, Coverdell Center for Biomedical and Health Sciences, 500 D. W. Brooks Drive, University of Georgia, Athens, GA, USA
| | - Dawn L Taylor-Mulneix
- Center for Vaccines and Immunology, College of Veterinary Medicine, University of Georgia, 501 D. W. Brooks Drive, Athens, GA, USA
| | - Shannon Wagner
- Department of Infectious Diseases, Coverdell Center for Biomedical and Health Sciences, 500 D. W. Brooks Drive, University of Georgia, Athens, GA, USA
| | - Valerie E Ryman
- Center for Vaccines and Immunology, College of Veterinary Medicine, University of Georgia, 501 D. W. Brooks Drive, Athens, GA, USA
| | - Coralis Rodriguez
- Graduate Program in Microbiology, University of Georgia, Athens, GA, USA
| | - Illiassou Hamidou Soumana
- Department of Infectious Diseases, Coverdell Center for Biomedical and Health Sciences, 500 D. W. Brooks Drive, University of Georgia, Athens, GA, USA
| | - Bruce R Levin
- Department of Biology, Emory University, 1510 Clifton Road, Atlanta, GA, USA
| | - Eric T Harvill
- Department of Infectious Diseases, Coverdell Center for Biomedical and Health Sciences, 500 D. W. Brooks Drive, University of Georgia, Athens, GA, USA.,Center for Vaccines and Immunology, College of Veterinary Medicine, University of Georgia, 501 D. W. Brooks Drive, Athens, GA, USA
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3
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Gestal MC, Rivera I, Howard LK, Dewan KK, Soumana IH, Dedloff M, Nicholson TL, Linz B, Harvill ET. Blood or Serum Exposure Induce Global Transcriptional Changes, Altered Antigenic Profile, and Increased Cytotoxicity by Classical Bordetellae. Front Microbiol 2018; 9:1969. [PMID: 30245672 PMCID: PMC6137168 DOI: 10.3389/fmicb.2018.01969] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 08/03/2018] [Indexed: 01/01/2023] Open
Abstract
The classical bordetellae sense and respond to a variety of environments outside and within their mammalian hosts. By causing inflammation and tissue damage, we reasoned that bordetellae are likely to encounter components of blood and/or serum during the course of a respiratory infection, and that detecting and responding to these would be advantageous. Therefore, we hypothesized that classical bordetellae have the ability to sense and respond to blood or serum. Blood or serum exposure resulted in substantial transcriptional changes in Bordetella bronchiseptica, including enhanced expression of many virulence-associated genes. Exposure to blood or serum additionally elicited production of multiple antigens not otherwise detectable, and led to increased bacterial cytotoxicity against macrophages. Transcriptional responses to blood/serum were observed in a Bvg- phase-locked mutant, indicating that the response is not solely dependent on a functional BvgAS system. Similar transcriptional responses to blood/serum were observed for the other classical bordetellae, Bordetella pertussis and Bordetella parapertussis. These data suggest the classical bordetellae respond to signals present in blood and serum by changing their behavior in ways that likely contribute to their remarkable success, via effects on pathogenesis, persistence and/or transmission between hosts.
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Affiliation(s)
- Monica C Gestal
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Israel Rivera
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Laura K Howard
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Kalyan K Dewan
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Illiassou Hamidou Soumana
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Margaret Dedloff
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | | | - Bodo Linz
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
| | - Eric T Harvill
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, United States
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Guiso N. Bordetella Adenylate Cyclase-Hemolysin Toxins. Toxins (Basel) 2017; 9:E277. [PMID: 28892012 PMCID: PMC5618210 DOI: 10.3390/toxins9090277] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 09/03/2017] [Accepted: 09/07/2017] [Indexed: 01/04/2023] Open
Abstract
Adenylate cyclase-hemolysin toxin is secreted and produced by three classical species of the genus Bordetella: Bordetella pertussis, B. parapertussis and B. bronchiseptica. This toxin has several properties such as: (i) adenylate cyclase activity, enhanced after interaction with the eukaryotic protein, calmodulin; (ii) a pore-forming activity; (iii) an invasive activity. It plays an important role in the pathogenesis of these Bordetella species responsible for whooping cough in humans or persistent respiratory infections in mammals, by modulating host immune responses. In contrast with other Bordetella toxins or adhesins, lack of (or very low polymorphism) is observed in the structural gene encoding this toxin, supporting its importance as well as a potential role as a vaccine antigen against whooping cough. In this article, an overview of the investigations undertaken on this toxin is presented.
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Affiliation(s)
- Nicole Guiso
- Institut Pasteur Unité de Prévention et Thérapies Moléculaires des Maladies Humaines, 25 rue du Dr. Roux, 75015 Paris, France.
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5
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6
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Linz B, Ivanov YV, Preston A, Brinkac L, Parkhill J, Kim M, Harris SR, Goodfield LL, Fry NK, Gorringe AR, Nicholson TL, Register KB, Losada L, Harvill ET. Acquisition and loss of virulence-associated factors during genome evolution and speciation in three clades of Bordetella species. BMC Genomics 2016; 17:767. [PMID: 27716057 PMCID: PMC5045587 DOI: 10.1186/s12864-016-3112-5] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Accepted: 09/23/2016] [Indexed: 11/10/2022] Open
Abstract
Background The genus Bordetella consists of nine species that include important respiratory pathogens such as the ‘classical’ species B. bronchiseptica, B. pertussis and B. parapertussis and six more distantly related and less extensively studied species. Here we analyze sequence diversity and gene content of 128 genome sequences from all nine species with focus on the evolution of virulence-associated factors. Results Both genome-wide sequence-based and gene content-based phylogenetic trees divide the genus into three species clades. The phylogenies are congruent between species suggesting genus-wide co-evolution of sequence diversity and gene content, but less correlated within species, mainly because of strain-specific presence of many different prophages. We compared the genomes with focus on virulence-associated genes and identified multiple clade-specific, species-specific and strain-specific events of gene acquisition and gene loss, including genes encoding O-antigens, protein secretion systems and bacterial toxins. Gene loss was more frequent than gene gain throughout the evolution, and loss of hundreds of genes was associated with the origin of several species, including the recently evolved human-restricted B. pertussis and B. holmesii, B. parapertussis and the avian pathogen B. avium. Conclusions Acquisition and loss of multiple genes drive the evolution and speciation in the genus Bordetella, including large scale gene loss associated with the origin of several species. Recent loss and functional inactivation of genes, including those encoding pertussis vaccine components and bacterial toxins, in individual strains emphasize ongoing evolution. Electronic supplementary material The online version of this article (doi:10.1186/s12864-016-3112-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bodo Linz
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA 16802, USA.
| | - Yury V Ivanov
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA 16802, USA
| | - Andrew Preston
- The Millner Centre for Evolution and Department of Biology and Biochemistry, University of Bath, Bath, UK
| | | | - Julian Parkhill
- Pathogen Genomics, The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, UK
| | - Maria Kim
- J. Craig Venter Institute, Rockville, MD, USA
| | - Simon R Harris
- Pathogen Genomics, The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, UK
| | - Laura L Goodfield
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA 16802, USA
| | - Norman K Fry
- Public Health England, Respiratory and Vaccine Preventable Bacteria Reference Unit, London, UK
| | | | - Tracy L Nicholson
- USDA, Agricultural Research Service, National Animal Disease Center, Ames, IA, USA
| | - Karen B Register
- USDA, Agricultural Research Service, National Animal Disease Center, Ames, IA, USA
| | | | - Eric T Harvill
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA 16802, USA. .,Singapore Centre on Environmental Life Sciences Engineering, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 637551, Singapore. .,Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA.
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7
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Register KB, Nicholson TL, Brunelle BW. Comparison of ribotyping and sequence-based typing for discriminating among isolates of Bordetella bronchiseptica. J Microbiol Methods 2016; 129:117-126. [PMID: 27542997 DOI: 10.1016/j.mimet.2016.08.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 08/15/2016] [Accepted: 08/15/2016] [Indexed: 11/16/2022]
Abstract
PvuII ribotyping and MLST are each highly discriminatory methods for genotyping Bordetella bronchiseptica, but a direct comparison between these approaches has not been undertaken. The goal of this study was to directly compare the discriminatory power of PvuII ribotyping and MLST, using a single set of geographically and genetically diverse strains, and to determine whether subtyping based on repeat region sequences of the pertactin gene (prn) provides additional resolution. One hundred twenty-two isolates were analyzed, representing 11 mammalian or avian hosts, sourced from the United States, Europe, Israel and Australia. Thirty-two ribotype patterns were identified; one isolate could not be typed. In comparison, all isolates were typeable by MLST and a total of 30 sequence types was identified. An analysis based on Simpson's Index of Diversity (SID) revealed that ribotyping and MLST are nearly equally discriminatory, with SIDs of 0.920 for ribotyping and 0.919 for MLST. Nonetheless, for ten ribotypes and eight MLST sequence types, the alternative method discriminates among isolates that otherwise type identically. Pairing prn repeat region typing with ribotyping yielded 54 genotypes and increased the SID to 0.954. Repeat region typing combined with MLST resulted in 47 genotypes and an SID of 0.944. Given the technical and practical advantages of MLST over ribotyping, and the nominal difference in their SIDs, we conclude MLST is the preferred primary typing tool. We recommend the combination of MLST and prn repeat region typing as a high-resolution, objective and standardized approach valuable for investigating the population structure and epidemiology of B. bronchiseptica.
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Affiliation(s)
- Karen B Register
- Ruminant Diseases and Immunology Research Unit, USDA/Agricultural Research Service/National Animal Disease Center, 1920 Dayton Avenue, Ames, IA 50010, United States.
| | - Tracy L Nicholson
- Virus and Prion Research Unit, USDA/Agricultural Research Service/National Animal Disease Center, 1920 Dayton Avenue, Ames, IA 50010, United States
| | - Brian W Brunelle
- Food Safety and Enteric Pathogens Research Unit, USDA/Agricultural Research Service/National Animal Disease Center, 1920 Dayton Avenue, Ames, IA 50010, United States
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8
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Nicholson TL, Shore SM, Register KB, Bayles DO, Kingsley RA, Brunelle BW. Comparative genomic analysis of the swine pathogen Bordetella bronchisepticastrain KM22. Vet Microbiol 2015; 182:87-94. [PMID: 26711033 PMCID: PMC7117204 DOI: 10.1016/j.vetmic.2015.10.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 10/22/2015] [Accepted: 10/27/2015] [Indexed: 11/01/2022]
Abstract
The well-characterized Bordetella bronchiseptica strain KM22, originally isolated from a pig with atrophic rhinitis, has been used to develop a reproducible swine respiratory disease model. The goal of this study was to identify genetic features unique to KM22 by comparing the genome sequence of KM22 to the laboratory reference strain RB50. To gain a broader perspective of the genetic relationship of KM22 among other B. bronchiseptica strains, selected genes of KM22 were then compared to five other B. bronchiseptica strains isolated from different hosts. Overall, the KM22 genome sequence is more similar to the genome sequences of the strains isolated from animals than the strains isolated from humans. The majority of virulence gene expression in Bordetella is positively regulated by the two-component sensory transduction system BvgAS. bopN, bvgA, fimB, and fimC were the most highly conserved BvgAS-regulated genes present in all seven strains analyzed. In contrast, the BvgAS-regulated genes present in all seven strains with the highest sequence divergence werefimN, fim2, fhaL, andfhaS. A total of eight major fimbrial subunit genes were identified in KM22. Quantitative real-time PCR data demonstrated that seven of the eight fimbrial subunit genes identified in KM22 are expressed and regulated by BvgAS. The annotation of the KM22 genome sequence, coupled with the comparative genomic analyses reported in this study, can be used to facilitate the development of vaccines with improved efficacy towards B. bronchiseptica in swine to decrease the prevalence and disease burden caused by this pathogen.
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Affiliation(s)
| | - Sarah M Shore
- National Animal Disease Center, ARS, USDA, Ames, IA, United States
| | - Karen B Register
- National Animal Disease Center, ARS, USDA, Ames, IA, United States
| | - Darrell O Bayles
- National Animal Disease Center, ARS, USDA, Ames, IA, United States
| | - Robert A Kingsley
- The Wellcome Trust Sanger Institute, the Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
| | - Brain W Brunelle
- National Animal Disease Center, ARS, USDA, Ames, IA, United States
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9
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Park J, Zhang Y, Chen C, Dudley EG, Harvill ET. Diversity of secretion systems associated with virulence characteristics of the classical bordetellae. MICROBIOLOGY-SGM 2015; 161:2328-40. [PMID: 26459829 DOI: 10.1099/mic.0.000197] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Secretion systems are key virulence factors, modulating interactions between pathogens and the host's immune response. Six potential secretion systems (types 1-6; T1SS-T6SS) have been discussed in classical bordetellae, respiratory commensals/pathogens of mammals. The prototypical Bordetella bronchiseptica strain RB50 genome seems to contain all six systems, whilst two human-restricted subspecies, Bordetella parapertussis and Bordetella pertussis, have lost different subsets of these. This implicates secretion systems in the divergent evolutionary histories that have led to their success in different niches. Based on our previous work demonstrating that changes in secretion systems are associated with virulence characteristics, we hypothesized there would be substantial divergence of the loci encoding each amongst sequenced strains. Here, we describe extensive differences in secretion system loci; 10 of the 11 sequenced strains had lost subsets of genes or one entire secretion system locus. These loci contained genes homologous to those present in the respective loci in distantly related organisms, as well as genes unique to bordetellae, suggesting novel and/or auxiliary functions. The high degree of conservation of the T3SS locus, a complex machine with interdependent parts that must be conserved, stands in dramatic contrast to repeated loss of T5aSS 'autotransporters', which function as an autonomous unit. This comparative analysis provided insights into critical aspects of each pathogen's adaptation to its different niche, and the relative contributions of recombination, mutation and horizontal gene transfer. In addition, the relative conservation of various secretion systems is an important consideration in the ongoing search for more highly conserved protective antigens for the next generation of pertussis vaccines.
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Affiliation(s)
- Jihye Park
- 1 Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA, USA 2 Graduate Program in Bioinformatics and Genomics, Pennsylvania State University, University Park, PA, USA
| | - Ying Zhang
- 1 Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA, USA
| | - Chun Chen
- 3 Department of Food Science, Pennsylvania State University, University Park, PA, USA
| | - Edward G Dudley
- 3 Department of Food Science, Pennsylvania State University, University Park, PA, USA
| | - Eric T Harvill
- 1 Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA, USA 4 Singapore Centre on Environmental Life Sciences Engineering, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore
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10
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Register KB, Ivanov YV, Harvill ET, Davison N, Foster G. Novel, host-restricted genotypes of Bordetella bronchiseptica associated with phocine respiratory tract isolates. MICROBIOLOGY (READING, ENGLAND) 2015; 161:580-92. [PMID: 25627438 PMCID: PMC4811649 DOI: 10.1099/mic.0.000035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 01/09/2015] [Indexed: 11/18/2022]
Abstract
During a succession of phocine morbillivirus outbreaks spanning the past 25 years, Bordetella bronchiseptica was identified as a frequent secondary invader and cause of death. The goal of this study was to evaluate genetic diversity and the molecular basis for host specificity among seal isolates from these outbreaks. MLST and PvuII ribotyping of 54 isolates from Scottish, English or Danish coasts of the Atlantic or North Sea revealed a single, host-restricted genotype. A single, novel genotype, unique from that of the Atlantic and North Sea isolates, was found in isolates from an outbreak in the Caspian Sea. Phylogenetic analysis based either on MLST sequence, ribotype patterns or genome-wide SNPs consistently placed both seal-specific genotypes within the same major clade but indicates a distinct evolutionary history for each. An additional isolate from the intestinal tract of a seal on the south-west coast of England has a genotype otherwise found in rabbit, guinea pig and pig isolates. To investigate the molecular basis for host specificity, DNA and predicted protein sequences of virulence genes that mediate host interactions were used in comparisons between a North Sea isolate, a Caspian Sea isolate and each of their closest relatives as inferred from genome-wide SNP analysis. Despite their phylogenetic divergence, fewer nucleotide and amino acid substitutions were found in comparisons of the two seal isolates than in comparisons with closely related strains. These data indicate isolates of B. bronchiseptica associated with respiratory disease in seals comprise unique, host-adapted and highly clonal populations.
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Affiliation(s)
- Karen B Register
- USDA, Agricultural Research Service, National Animal Disease Center, Ruminant Diseases and Immunology Research Unit, 1920 Dayton Avenue, Ames, IA 50010, USA
| | - Yury V Ivanov
- The Pennsylvania State University, Department of Veterinary and Biomedical Sciences, W-213 Millennium Science Complex, University Park, PA 16802, USA
| | - Eric T Harvill
- The Pennsylvania State University, Department of Veterinary and Biomedical Sciences, W-213 Millennium Science Complex, University Park, PA 16802, USA
| | - Nick Davison
- Scottish Marine Animal Stranding Scheme SAC Consulting Veterinary Services, Drummondhill, Stratherrick Road, Inverness IV2 4JZ, UK
| | - Geoffrey Foster
- Scottish Marine Animal Stranding Scheme SAC Consulting Veterinary Services, Drummondhill, Stratherrick Road, Inverness IV2 4JZ, UK
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11
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Wehmann E, Khayer B, Magyar T. Heterogeneity of Bordetella bronchiseptica adenylate cyclase (cyaA) RTX domain. Arch Microbiol 2014; 197:105-12. [PMID: 25475014 DOI: 10.1007/s00203-014-1068-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 10/21/2014] [Accepted: 11/24/2014] [Indexed: 11/26/2022]
Abstract
Bordetella bronchiseptica is a widespread pathogen, with a broad host range, occasionally including humans. Diverse virulence factors (adhesins, toxins) allow its adaptation to its host, but this property of the adenylate cyclase (cyaA) toxin is not well understood. In this study, we analyzed the repeats-in-toxin domain of B. bronchiseptica cyaA with PCR, followed by restriction fragment length analysis. Of ninety-two B. bronchiseptica strains collected from different hosts and geographic regions, 72 (78.3 %) carried cyaA and four RFLP types (A-D) were established using NarI and SalI. However, in 20 strains, cyaA was replaced with a peptide transport protein operon. A phylogenetic tree based on partial nucleotide sequences of cyaA revealed that group 2 contains strains of specifically human origin, whereas subgroup 1a contains all but one of the strains from pigs. The human strains showed many PCR-RFLP and sequence variants, confirming the clonal population structure of B. bronchiseptica.
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Affiliation(s)
- Enikő Wehmann
- Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, Hungária krt. 21, 1143, Budapest, Hungary,
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12
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Abstract
The Bordetella genus comprises nine species of which Bordetella pertussis and B. parapertussis are isolated from humans and are the most studied Bordetella species since they cause whooping cough. They both originate from B. bronchiseptica, which infects several mammals and immune compromised humans, but the intensive use of pertussis vaccines induced changes in B. pertussis and B. parapertussis populations. B. petrii and B. holmesii are other species of unknown reservoir and transmission pattern that have been described in humans. It is still unknown whether these species are pathogens for humans or only opportunistic bacteria but biological diagnosis has confirmed the presence of B. holmesii in human respiratory samples while B. petrii and the four other species have little implications for public health.
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Affiliation(s)
- Nicole Guiso
- Institut Pasteur, Unité de Prévention et Thérapies Moléculaires des Maladies Humaines, 25-28 rue du Dr Roux, F-75015 Paris, France
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13
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Comparative analyses of a cystic fibrosis isolate of Bordetella bronchiseptica reveal differences in important pathogenic phenotypes. Infect Immun 2014; 82:1627-37. [PMID: 24470470 DOI: 10.1128/iai.01453-13] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Bordetella bronchiseptica is a Gram-negative bacterium that infects and causes disease in a wide variety of animals. B. bronchiseptica also infects humans, thereby demonstrating zoonotic transmission. An extensive characterization of human B. bronchiseptica isolates is needed to better understand the distinct genetic and phenotypic traits associated with these zoonotic transmission events. Using whole-genome transcriptome and CGH analysis, we report that a B. bronchiseptica cystic fibrosis isolate, T44625, contains a distinct genomic content of virulence-associated genes and differentially expresses these genes compared to the sequenced model laboratory strain RB50, a rabbit isolate. The differential gene expression pattern correlated with unique phenotypes exhibited by T44625, which included lower motility, increased aggregation, hyperbiofilm formation, and an increased in vitro capacity to adhere to respiratory epithelial cells. Using a mouse intranasal infection model, we found that although defective in establishing high bacterial burdens early during the infection process, T44625 persisted efficiently in the mouse nose. By documenting the unique genomic and phenotypic attributes of T44625, this report provides a blueprint for understanding the successful zoonotic potential of B. bronchiseptica and other zoonotic bacteria.
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Brady C, Ackerman P, Johnson M, McNamara J. Bordetella bronchiseptica in a pediatric Cystic Fibrosis center. J Cyst Fibros 2013; 13:43-8. [PMID: 24011471 DOI: 10.1016/j.jcf.2013.08.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Revised: 08/02/2013] [Accepted: 08/05/2013] [Indexed: 11/27/2022]
Abstract
BACKGROUND Bordetella bronchiseptica is a common pathogenic or colonizing organism of domestic mammals. In dogs, it causes an infectious tracheobronchitis known as Kennel Cough. Human infections are unusual and almost exclusively described in immunocompromised patients who have had contact with a known animal reservoir. It is rarely reported in Cystic Fibrosis (CF), possibly hampered by low recovery from culture and organism misidentification. We describe the incidence and characteristics of B. bronchiseptica in our CF population. METHODS A retrospective cohort study was conducted of our center's CF patient population. Patients were included if they had B. bronchiseptica isolated on one or more occasion. RESULTS Seven children with CF isolated B. bronchiseptica on 23 occasions, frequently associated with the symptoms of a pulmonary exacerbation. Four patients required hospitalization. CONCLUSION These results suggest that B. bronchiseptica may be more common than previously reported and may play a potential pathogenic role in CF.
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Affiliation(s)
- Cynthia Brady
- Children's Hospitals and Clinics of MN, Center for Cystic Fibrosis, 2525 Chicago Avenue South, Minneapolis, MN 55404, United States; Children's Respiratory and Critical Care Specialists, 2530 Chicago Avenue South, Minneapolis, MN 55404, United States.
| | - Patricia Ackerman
- Children's Hospitals and Clinics of MN, Center for Cystic Fibrosis, 2525 Chicago Avenue South, Minneapolis, MN 55404, United States
| | - Mahrya Johnson
- Children's Hospitals and Clinics of MN, Center for Cystic Fibrosis, 2525 Chicago Avenue South, Minneapolis, MN 55404, United States
| | - John McNamara
- Children's Hospitals and Clinics of MN, Center for Cystic Fibrosis, 2525 Chicago Avenue South, Minneapolis, MN 55404, United States; Children's Respiratory and Critical Care Specialists, 2530 Chicago Avenue South, Minneapolis, MN 55404, United States
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Nicholson TL, Conover MS, Deora R. Transcriptome profiling reveals stage-specific production and requirement of flagella during biofilm development in Bordetella bronchiseptica. PLoS One 2012; 7:e49166. [PMID: 23152870 PMCID: PMC3495763 DOI: 10.1371/journal.pone.0049166] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 10/09/2012] [Indexed: 11/25/2022] Open
Abstract
We have used microarray analysis to study the transcriptome of the bacterial pathogen Bordetella bronchiseptica over the course of five time points representing distinct stages of biofilm development. The results suggest that B. bronchiseptica undergoes a coordinately regulated gene expression program similar to a bacterial developmental process. Expression and subsequent production of the genes encoding flagella, a classical Bvg− phase phenotype, occurs and is under tight regulatory control during B. bronchiseptica biofilm development. Using mutational analysis, we demonstrate that flagella production at the appropriate stage of biofilm development, i.e. production early subsequently followed by repression, is required for robust biofilm formation and maturation. We also demonstrate that flagella are necessary and enhance the initial cell-surface interactions, thereby providing mechanistic information on the initial stages of biofilm development for B. bronchiseptica. Biofilm formation by B. bronchiseptica involves the production of both Bvg-activated and Bvg-repressed factors followed by the repression of factors that inhibit formation of mature biofilms.
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Affiliation(s)
- Tracy L. Nicholson
- National Animal Disease Center, Agricultural Research Service, USDA, Ames, Iowa, United States of America
- * E-mail: (RD); (TLN)
| | - Matt S. Conover
- Program in Molecular Genetics, Wake Forest University Health Sciences, Winston-Salem, North Carolina, United States of America
| | - Rajendar Deora
- Program in Molecular Genetics, Wake Forest University Health Sciences, Winston-Salem, North Carolina, United States of America
- Department of Microbiology and Immunology, Wake Forest University Health Sciences, Winston-Salem, North Carolina, United States of America
- * E-mail: (RD); (TLN)
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16
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Hester SE, Lui M, Nicholson T, Nowacki D, Harvill ET. Identification of a CO2 responsive regulon in Bordetella. PLoS One 2012; 7:e47635. [PMID: 23112828 PMCID: PMC3480411 DOI: 10.1371/journal.pone.0047635] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 09/19/2012] [Indexed: 01/13/2023] Open
Abstract
Sensing the environment allows pathogenic bacteria to coordinately regulate gene expression to maximize survival within or outside of a host. Here we show that Bordetella species regulate virulence factor expression in response to carbon dioxide levels that mimic in vivo conditions within the respiratory tract. We found strains of Bordetella bronchiseptica that did not produce adenylate cyclase toxin (ACT) when grown in liquid or solid media with ambient air aeration, but produced ACT and additional antigens when grown in air supplemented to 5% CO(2). Transcriptome analysis and quantitative real time-PCR analysis revealed that strain 761, as well as strain RB50, increased transcription of genes encoding ACT, filamentous hemagglutinin (FHA), pertactin, fimbriae and the type III secretion system in 5% CO(2) conditions, relative to ambient air. Furthermore, transcription of cyaA and fhaB in response to 5% CO(2) was increased even in the absence of BvgS. In vitro analysis also revealed increases in cytotoxicity and adherence when strains were grown in 5% CO(2). The human pathogens B. pertussis and B. parapertussis also increased transcription of several virulence factors when grown in 5% CO(2), indicating that this response is conserved among the classical bordetellae. Together, our data indicate that Bordetella species can sense and respond to physiologically relevant changes in CO(2) concentrations by regulating virulence factors important for colonization, persistence and evasion of the host immune response.
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Affiliation(s)
- Sara E. Hester
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
- Graduate Program in Biochemistry, Microbiology, and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Minghsun Lui
- Department of Microbiology, Immunology, and Molecular Genetics, David Geffen School of Medicine at UCLA, University of California Los Angeles, Los Angeles, California, United States of America
| | - Tracy Nicholson
- National Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Ames, Iowa, United State of America
| | - Daryl Nowacki
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
- Graduate Program in Biochemistry, Microbiology, and Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Eric T. Harvill
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, Pennsylvania, United States of America
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17
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A Type VI secretion system encoding locus is required for Bordetella bronchiseptica immunomodulation and persistence in vivo. PLoS One 2012; 7:e45892. [PMID: 23071529 PMCID: PMC3470547 DOI: 10.1371/journal.pone.0045892] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Accepted: 08/27/2012] [Indexed: 11/19/2022] Open
Abstract
Type VI Secretion Systems (T6SSs) have been identified in numerous Gram-negative pathogens, but the lack of a natural host infection model has limited analysis of T6SS contributions to infection and pathogenesis. Here, we describe disruption of a gene within locus encoding a putative T6SS in Bordetella bronchiseptica strain RB50, a respiratory pathogen that circulates in a broad range of mammals, including humans, domestic animals, and mice. The 26 gene locus encoding the B. bronchiseptica T6SS contains apparent orthologs to all known core genes and possesses thirteen novel genes. By generating an in frame deletion of clpV, which encodes a putative ATPase required for some T6SS-dependent protein secretion, we observe that ClpV contributes to in vitro macrophage cytotoxicity while inducing several eukaryotic proteins associated with apoptosis. Additionally, ClpV is required for induction of IL-1β, IL-6, IL-17, and IL-10 production in J774 macrophages infected with RB50. During infections in wild type mice, we determined that ClpV contributes to altered cytokine production, increased pathology, delayed lower respiratory tract clearance, and long term nasal cavity persistence. Together, these results reveal a natural host infection system in which to interrogate T6SS contributions to immunomodulation and pathogenesis.
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18
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Park J, Zhang Y, Buboltz AM, Zhang X, Schuster SC, Ahuja U, Liu M, Miller JF, Sebaihia M, Bentley SD, Parkhill J, Harvill ET. Comparative genomics of the classical Bordetella subspecies: the evolution and exchange of virulence-associated diversity amongst closely related pathogens. BMC Genomics 2012; 13:545. [PMID: 23051057 PMCID: PMC3533505 DOI: 10.1186/1471-2164-13-545] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Accepted: 09/21/2012] [Indexed: 12/04/2022] Open
Abstract
Background The classical Bordetella subspecies are phylogenetically closely related, yet differ in some of the most interesting and important characteristics of pathogens, such as host range, virulence and persistence. The compelling picture from previous comparisons of the three sequenced genomes was of genome degradation, with substantial loss of genome content (up to 24%) associated with adaptation to humans. Results For a more comprehensive picture of lineage evolution, we employed comparative genomic and phylogenomic analyses using seven additional diverse, newly sequenced Bordetella isolates. Genome-wide single nucleotide polymorphism (SNP) analysis supports a reevaluation of the phylogenetic relationships between the classical Bordetella subspecies, and suggests a closer link between ovine and human B. parapertussis lineages than has been previously proposed. Comparative analyses of genome content revealed that only 50% of the pan-genome is conserved in all strains, reflecting substantial diversity of genome content in these closely related pathogens that may relate to their different host ranges, virulence and persistence characteristics. Strikingly, these analyses suggest possible horizontal gene transfer (HGT) events in multiple loci encoding virulence factors, including O-antigen and pertussis toxin (Ptx). Segments of the pertussis toxin locus (ptx) and its secretion system locus (ptl) appear to have been acquired by the classical Bordetella subspecies and are divergent in different lineages, suggesting functional divergence in the classical Bordetellae. Conclusions Together, these observations, especially in key virulence factors, reveal that multiple mechanisms, such as point mutations, gain or loss of genes, as well as HGTs, contribute to the substantial phenotypic diversity of these versatile subspecies in various hosts.
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Affiliation(s)
- Jihye Park
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, USA
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19
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Ahuja U, Liu M, Tomida S, Park J, Souda P, Whitelegge J, Li H, Harvill ET, Parkhill J, Miller JF. Phenotypic and genomic analysis of hypervirulent human-associated Bordetella bronchiseptica. BMC Microbiol 2012; 12:167. [PMID: 22863321 PMCID: PMC3462115 DOI: 10.1186/1471-2180-12-167] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Accepted: 07/17/2012] [Indexed: 01/17/2023] Open
Abstract
Background B. bronchiseptica infections are usually associated with wild or domesticated animals, but infrequently with humans. A recent phylogenetic analysis distinguished two distinct B. bronchiseptica subpopulations, designated complexes I and IV. Complex IV isolates appear to have a bias for infecting humans; however, little is known regarding their epidemiology, virulence properties, or comparative genomics. Results Here we report a characterization of the virulence of human-associated complex IV B. bronchiseptica strains. In in vitro cytotoxicity assays, complex IV strains showed increased cytotoxicity in comparison to a panel of complex I strains. Some complex IV isolates were remarkably cytotoxic, resulting in LDH release levels in A549 cells that were 10- to 20-fold greater than complex I strains. In vivo, a subset of complex IV strains was found to be hypervirulent, with an increased ability to cause lethal pulmonary infections in mice. Hypercytotoxicity in vitro and hypervirulence in vivo were both dependent on the activity of the bsc T3SS and the BteA effector. To clarify differences between lineages, representative complex IV isolates were sequenced and their genomes were compared to complex I isolates. Although our analysis showed there were no genomic sequences that can be considered unique to complex IV strains, there were several loci that were predominantly found in complex IV isolates. Conclusion Our observations reveal a T3SS-dependent hypervirulence phenotype in human-associated complex IV isolates, highlighting the need for further studies on the epidemiology and evolutionary dynamics of this B. bronchiseptica lineage.
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Affiliation(s)
- Umesh Ahuja
- Department of Microbiology, Immunology and Molecular Genetics, University of California, BSRB 254, 615 Charles E, Young Drive East, Los Angeles, CA 90095-1747, USA
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20
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Cloning, expression, and characterization of an adenylate cyclase from Arthrobacter sp. CGMCC 3584. Appl Microbiol Biotechnol 2012; 96:963-70. [DOI: 10.1007/s00253-012-3890-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Revised: 12/29/2011] [Accepted: 01/04/2012] [Indexed: 11/25/2022]
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21
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Register KB, Sukumar N, Palavecino EL, Rubin BK, Deora R. Bordetella bronchiseptica in a paediatric cystic fibrosis patient: possible transmission from a household cat. Zoonoses Public Health 2012; 59:246-50. [PMID: 22212633 DOI: 10.1111/j.1863-2378.2011.01446.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bordetella bronchiseptica is a zoonotic respiratory pathogen commonly found in domesticated farm and companion animals, including dogs and cats. Here, we report isolation of B. bronchiseptica from a sputum sample of a cystic fibrosis patient recently exposed to a kitten with an acute respiratory illness. Genetic characterization of the isolate and comparison with other isolates of human or feline origin strongly suggest that the kitten was the source of infection.
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Affiliation(s)
- K B Register
- USDA/Agricultural Research Service/National Animal Disease Center, Ames, IA, USA.
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22
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Le Coustumier A, Njamkepo E, Cattoir V, Guillot S, Guiso N. Bordetella petrii infection with long-lasting persistence in human. Emerg Infect Dis 2011; 17:612-8. [PMID: 21470449 PMCID: PMC3377417 DOI: 10.3201/eid1704.101480] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
B. petrii infection can persist in persons with chronic obstructive pulmonary disease. We report the repeated isolation of Bordetella petrii in the sputum of a 79-year-old female patient with diffuse bronchiectasis and persistence of the bacterium for >1 year. The patient was first hospitalized due to dyspnea, which developed into severe cough with purulent sputum that yielded B. petrii on culture. After this first episode, the patient was hospitalized an additional 4 times with bronchorrhea symptoms. The isolates collected were analyzed by using biochemical, genotypic, and proteomic tools. Expression of specific proteins was analyzed by using serum samples from the patient. The B. petrii isolates were compared with other B. petrii isolates collected from humans or the environment and with isolates of B. pertussis, B. parapertussis, B. bronchiseptica, and B. holmesii, obtained from human respiratory tract infections. Our observations indicate that B. petrii can persist in persons with chronic pulmonary obstructive disease as has been previously demonstrated for B. bronchiseptica.
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23
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Goebel EM, Zhang X, Harvill ET. Bordetella pertussis infection or vaccination substantially protects mice against B. bronchiseptica infection. PLoS One 2009; 4:e6778. [PMID: 19707559 PMCID: PMC2727957 DOI: 10.1371/journal.pone.0006778] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2009] [Accepted: 07/27/2009] [Indexed: 01/01/2023] Open
Abstract
Although B. bronchiseptica efficiently infects a wide range of mammalian hosts and efficiently spreads among them, it is rarely observed in humans. In contrast to the many other hosts of B. bronchiseptica, humans are host to the apparently specialized pathogen B. pertussis, the great majority having immunity due to vaccination, infection or both. Here we explore whether immunity to B. pertussis protects against B. bronchiseptica infection. In a murine model, either infection or vaccination with B. pertussis induced antibodies that recognized antigens of B. bronchiseptica and protected the lower respiratory tract of mice against three phylogenetically disparate strains of B. bronchiseptica that efficiently infect naïve animals. Furthermore, vaccination with purified B. pertussis-derived pertactin, filamentous hemagglutinin or the human acellular vaccine, Adacel, conferred similar protection against B. bronchiseptica challenge. These data indicate that individual immunity to B. pertussis affects B. bronchiseptica infection, and suggest that the high levels of herd immunity against B. pertussis in humans could explain the lack of observed B. bronchiseptica transmission. This could also explain the apparent association of B. bronchiseptica infections with an immunocompromised state.
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Affiliation(s)
- Elizabeth M. Goebel
- Department of Veterinary and Biomedical Sciences, the Pennsylvania State University, University Park, Pennsylvania, United States of America
- Graduate Program in Immunology and Infectious Diseases, the Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Xuqing Zhang
- Department of Veterinary and Biomedical Sciences, the Pennsylvania State University, University Park, Pennsylvania, United States of America
- Graduate Program in Genetics, the Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Eric T. Harvill
- Department of Veterinary and Biomedical Sciences, the Pennsylvania State University, University Park, Pennsylvania, United States of America
- * E-mail:
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24
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Microarray and functional analysis of growth phase-dependent gene regulation in Bordetella bronchiseptica. Infect Immun 2009; 77:4221-31. [PMID: 19667046 DOI: 10.1128/iai.00136-09] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Growth phase-dependent gene regulation has recently been demonstrated to occur in Bordetella pertussis, with many transcripts, including known virulence factors, significantly decreasing during the transition from logarithmic to stationary-phase growth. Given that B. pertussis is thought to have derived from a Bordetella bronchiseptica-like ancestor, we hypothesized that growth phase-dependent gene regulation would also occur in B. bronchiseptica. Microarray analysis revealed and quantitative real-time PCR (qRT-PCR) confirmed that growth phase-dependent gene regulation occurs in B. bronchiseptica, resulting in prominent temporal shifts in global gene expression. Two virulence phenotypes associated with these gene expression changes were tested. We found that growth-dependent increases in expression of some type III secretion system (TTSS) genes led to a growth phase-dependent increase in a TTSS-dependent function, cytotoxicity. Although the transcription of genes encoding adhesins previously shown to mediate adherence was decreased in late-log and stationary phases, we found that the adherence of B. bronchiseptica did not decrease in these later phases of growth. Microarray analysis revealed and qRT-PCR confirmed that growth phase-dependent gene regulation occurred in both Bvg(+) and Bvg(-) phase-locked mutants, indicating that growth phase-dependent gene regulation in B. bronchiseptica can function independently from the BvgAS regulatory system.
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25
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Lechner M, Schmitt K, Bauer S, Hot D, Hubans C, Levillain E, Locht C, Lemoine Y, Gross R. Genomic island excisions in Bordetella petrii. BMC Microbiol 2009; 9:141. [PMID: 19615092 PMCID: PMC2717098 DOI: 10.1186/1471-2180-9-141] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2008] [Accepted: 07/18/2009] [Indexed: 11/23/2022] Open
Abstract
Background Among the members of the genus Bordetella B. petrii is unique, since it is the only species isolated from the environment, while the pathogenic Bordetellae are obligately associated with host organisms. Another feature distinguishing B. petrii from the other sequenced Bordetellae is the presence of a large number of mobile genetic elements including several large genomic regions with typical characteristics of genomic islands collectively known as integrative and conjugative elements (ICEs). These elements mainly encode accessory metabolic factors enabling this bacterium to grow on a large repertoire of aromatic compounds. Results During in vitro culture of Bordetella petrii colony variants appear frequently. We show that this variability can be attributed to the presence of a large number of metastable mobile genetic elements on its chromosome. In fact, the genome sequence of B. petrii revealed the presence of at least seven large genomic islands mostly encoding accessory metabolic functions involved in the degradation of aromatic compounds and detoxification of heavy metals. Four of these islands (termed GI1 to GI3 and GI6) are highly related to ICEclc of Pseudomonas knackmussii sp. strain B13. Here we present first data about the molecular characterization of these islands. We defined the exact borders of each island and we show that during standard culture of the bacteria these islands get excised from the chromosome. For all but one of these islands (GI5) we could detect circular intermediates. For the clc-like elements GI1 to GI3 of B. petrii we provide evidence that tandem insertion of these islands which all encode highly related integrases and attachment sites may also lead to incorporation of genomic DNA which originally was not part of the island and to the formation of huge composite islands. By integration of a tetracycline resistance cassette into GI3 we found this island to be rather unstable and to be lost from the bacterial population within about 100 consecutive generations. Furthermore, we show that GI3 is self transmissible and by conjugation can be transferred to B. bronchiseptica thus proving it to be an active integrative and conjugative element Conclusion The results show that phenotypic variation of B. petrii is correlated with the presence of genomic islands. Tandem integration of related islands may contribute to island evolution by the acquisition of genes originally belonging to the bacterial core genome. In conclusion, B. petrii appears to be the first member of the genus in which horizontal gene transfer events have massively shaped its genome structure.
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Affiliation(s)
- Melanie Lechner
- Lehrstuhl für Mikrobiologie, Biozentrum, Universität Würzburg, Am Hubland, Würzburg, Germany.
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Role of the type III secretion system in a hypervirulent lineage of Bordetella bronchiseptica. Infect Immun 2009; 77:3969-77. [PMID: 19596779 DOI: 10.1128/iai.01362-08] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Despite the fact that closely related bacteria can cause different levels of disease, the genetic changes that cause some isolates to be more pathogenic than others are generally not well understood. We use a combination of approaches to determine which factors contribute to the increased virulence of a Bordetella bronchiseptica lineage. A strain isolated from a host with B. bronchiseptica-induced disease, strain 1289, was 60-fold more virulent in mice than one isolated from an asymptomatically infected host, strain RB50. Transcriptome analysis and quantitative reverse transcription-PCR showed that the type III secretion system (TTSS) genes were more highly expressed by strain 1289 than strain RB50. Compared to strain RB50, strain 1289 exhibited greater TTSS-mediated cytotoxicity of a mammalian cell line. Additionally, we show that the increase in virulence of strain 1289 compared to that of RB50 was partially attributable to the TTSS. Using multilocus sequence typing, we identified another strain from the same lineage as strain 1289. Similar to strain 1289, we implicate the TTSS in the increased virulence of this strain. Together, our data suggest that the TTSS is involved in the increased virulence of a B. bronchiseptica lineage which appears to be disproportionately associated with disease. These data are consistent with the view that B. bronchiseptica lineages can have different levels of virulence, which may contribute to this species' ability to cause different severities of respiratory disease.
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Evidence for horizontal gene transfer of two antigenically distinct O antigens in Bordetella bronchiseptica. Infect Immun 2009; 77:3249-57. [PMID: 19528223 DOI: 10.1128/iai.01448-08] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Host immunity is a major driving force of antigenic diversity, resulting in pathogens that can evade immunity induced by closely related strains. Here we show that two Bordetella bronchiseptica strains, RB50 and 1289, express two antigenically distinct O-antigen serotypes (O1 and O2, respectively). When 18 additional B. bronchiseptica strains were serotyped, all were found to express either the O1 or O2 serotype. Comparative genomic hybridization and PCR screening showed that the expression of either the O1 or O2 serotype correlated with the strain containing either the classical or alternative O-antigen locus, respectively. Multilocus sequence typing analysis of 49 B. bronchiseptica strains was used to build a phylogenetic tree, which revealed that the two O-antigen loci did not associate with a particular lineage, evidence that these loci are horizontally transferred between B. bronchiseptica strains. From experiments using mice vaccinated with purified lipopolysaccharide from strain RB50 (O1), 1289 (O2), or RB50Deltawbm (O antigen deficient), our data indicate that these O antigens do not confer cross-protection in vivo. The lack of cross-immunity between O-antigen serotypes appears to contribute to inefficient antibody-mediated clearance between strains. Together, these data are consistent with the idea that the O-antigen loci of B. bronchiseptica are horizontally transferred between strains and encode antigenically distinct serotypes, resulting in inefficient cross-immunity.
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Active and passive immunizations with Bordetella colonization factor A protect mice against respiratory challenge with Bordetella bronchiseptica. Infect Immun 2008; 77:885-95. [PMID: 19064638 DOI: 10.1128/iai.01076-08] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Bordetella colonization factor A (BcfA) is an outer membrane immunogenic protein, which is critical for efficient colonization of the murine respiratory tract. These properties of BcfA prompted us to examine its utility in inducing a protective immune response against Bordetella bronchiseptica in a mouse model of intranasal infection. Mice vaccinated with BcfA demonstrated reduced pathology in the lungs and harbored lower bacterial burdens in the respiratory tract. Immunization with BcfA led to the generation of BcfA-specific antibodies in both the sera and lungs, and passive immunization led to the reduction of B. bronchiseptica in the tracheas and lungs. These results suggest that protection after immunization with BcfA is mediated in part by antibodies against BcfA. To further investigate the mechanism of BcfA-induced immune clearance, we examined the role of neutrophils and macrophages. Our results demonstrate that neutrophils are critical for anti-BcfA antibody-mediated clearance and that opsonization with anti-BcfA serum enhances phagocytosis of B. bronchiseptica by murine macrophages. We show that immunization with BcfA results in the production of gamma interferon and subclasses of immunoglobulin G antibodies that are consistent with the induction of a Th1-type immune response. In combination, our findings suggest that the mechanism of BcfA-mediated immunity involves humoral and cellular responses. Expression of BcfA is conserved among multiple clinical isolates of B. bronchiseptica. Our results demonstrate the striking protective efficacy of BcfA-mediated immunization, thereby highlighting its utility as a potential vaccine candidate. These results also provide a model for the development of cell-free vaccines against B. bronchiseptica.
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