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Bhavana VH, Hillebrand GH, Gopalakrishna KP, Rapp RA, Ratner AJ, Tettelin H, Hooven TA. A group B Streptococcus indexed transposon mutant library to accelerate genetic research on an important perinatal pathogen. Microbiol Spectr 2023; 11:e0204623. [PMID: 37933989 PMCID: PMC10714824 DOI: 10.1128/spectrum.02046-23] [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: 05/18/2023] [Accepted: 09/29/2023] [Indexed: 11/08/2023] Open
Abstract
IMPORTANCE Group B Streptococcus (GBS) is a significant global cause of serious infections, most of which affect pregnant women, newborns, and infants. Studying GBS genetic mutant strains is a valuable approach for learning more about how these infections are caused and is a key step toward developing more effective preventative and treatment strategies. In this resource report, we describe a newly created library of defined GBS genetic mutants, containing over 1,900 genetic variants, each with a unique disruption to its chromosome. An indexed library of this scale is unprecedented in the GBS field; it includes strains with mutations in hundreds of genes whose potential functions in human disease remain unknown. We have made this resource freely available to the broader research community through deposition in a publicly funded bacterial maintenance and distribution repository.
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Affiliation(s)
- Venkata H. Bhavana
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Gideon H. Hillebrand
- University of Pittsburgh, Graduate Program in Microbiology and Immunology, Pittsburgh, Pennsylvania, USA
| | | | - Rebekah A. Rapp
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- The Ellis School, Pittsburgh, Pennsylvania, USA
| | - Adam J. Ratner
- Department of Pediatrics, New York University, New York, New York, USA
- Department of Microbiology, New York University, New York, New York, USA
| | - Hervé Tettelin
- Department of Microbiology and Immunology, Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Thomas A. Hooven
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
- University of Pittsburgh, Graduate Program in Microbiology and Immunology, Pittsburgh, Pennsylvania, USA
- Richard King Mellon Institute for Pediatric Research, University of Pittsburgh Medical School, Pittsburgh, Pennsylvania, USA
- UPMC Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
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Alzayer M, Alkhulaifi MM, Alyami A, Aldosary M, Alageel A, Garaween G, Shibl A, Al-Hamad AM, Doumith M. Molecular typing and antimicrobial resistance of group B Streptococcus clinical isolates in Saudi Arabia. J Glob Antimicrob Resist 2023; 35:244-251. [PMID: 37844802 DOI: 10.1016/j.jgar.2023.10.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 10/06/2023] [Indexed: 10/18/2023] Open
Abstract
OBJECTIVES Group B Streptococcus (GBS) has emerged as an important cause of severe infections in adults. However, limited data are available regarding the epidemiology of GBS in Saudi Arabia. METHODS Isolates were collected over a period of eight months from colonized (n = 104) and infected adults (n = 95). Serotypes and virulence determinants were detected by polymerase chain reactions (PCRs). Genetic relatedness was assessed using Multiple Locus Variable Number Tandem Repeat Analysis (MLVA). Antimicrobial susceptibilities were determined by disk diffusion. RESULTS Serotypes III and V (25% each) were the most prevalent, followed by serotypes II (16.18%), Ia (13.24%), VI (9.31%), and Ib (8.82%), while five isolates remained non-typeable (2.45%). Hypervirulent serotype III/CC17 clone (n = 21) accounted for 41.18% of the serotype III isolates. Most isolates (53.92%) harboured pilus island (PI) 1 and 2a types, while PI-2b was predominantly detected in the hypervirulent clone. Isolates were variably resistant to tetracycline (76.47%), erythromycin (36.76%), clindamycin (25.49%), and levofloxacin (6.37%), but remained susceptible to penicillin. Macrolide resistant isolates exhibited constitutive (55.42%) and inducible macrolide-lincosamide-streptogramin B resistance phenotypes (33.74%), while a few had L (9.64%) or M (1.2%) phenotypes. MLVA patterns of dominant serotypes III and V revealed 40 different types divided into 12 clusters and 28 singletons. Interestingly, macrolide resistance was significantly associated with two major MLVA types. CONCLUSIONS GBS isolates belonged predominantly to serotypes III and V, but there were no clear associations between serotypes and patient groups. The studied isolates exhibited high levels of resistance to erythromycin and clindamycin that need further surveillance.
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Affiliation(s)
- Maha Alzayer
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia; Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia.
| | - Manal M Alkhulaifi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Ahmed Alyami
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Mohammed Aldosary
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Abdulaziz Alageel
- Pathology and Clinical Laboratory, Medicine Administration, King Fahad Medical City, Riyadh, Saudi Arabia
| | - Ghada Garaween
- Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Atef Shibl
- Department of Microbiology and Immunology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Arif M Al-Hamad
- Division of Clinical Microbiology, Pathology and Laboratory Medicine, Qatif Central Hospital, Qatif, Saudi Arabia
| | - Michel Doumith
- Infectious Diseases Research Department, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
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Xiong L, Deng C, Yang G, Shen M, Chen B, Tian R, Zha H, Wu K. Molecular epidemiology and antimicrobial resistance patterns of carbapenem-resistant Acinetobacter baumannii isolates from patients admitted at ICUs of a teaching hospital in Zunyi, China. Front Cell Infect Microbiol 2023; 13:1280372. [PMID: 38106474 PMCID: PMC10722174 DOI: 10.3389/fcimb.2023.1280372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Accepted: 11/13/2023] [Indexed: 12/19/2023] Open
Abstract
Background Carbapenem-resistant Acinetobacter baumannii (CRAB) has emerged as a predominant strain of healthcare-associated infections worldwide, particularly in intensive care units (ICUs). Therefore, it is imperative to study the molecular epidemiology of CRAB in the ICUs using multiple molecular typing methods to lay the foundation for the development of infection prevention and control strategies. This study aimed to determine the antimicrobial susceptibility profile, the molecular epidemiology and conduct homology analysis on CRAB strains isolated from ICUs. Methods The sensitivity to various antimicrobials was determined using the minimum inhibitory concentration (MIC) method, Kirby-Bauer disk diffusion (KBDD), and E-test assays. Resistance genes were identified by polymerase chain reaction (PCR). Molecular typing was performed using multilocus sequence typing (MLST) and multiple-locus variable-number tandem repeat analysis (MLVA). Results Among the 79 isolates collected, they exhibited high resistance to various antimicrobials but showed low resistance to levofloxacin, trimethoprim-sulfamethoxazole, and tetracyclines. Notably, all isolates of A. baumannii were identified as multidrug-resistant A. baumannii (MDR-AB). The bla OXA-51-like, adeJ, and adeG genes were all detected, while the detection rates of bla OXA-23-like (97.5%), adeB (93.67%), bla ADC (93.67%), qacEΔ1-sul1 (84.81%) were higher; most of the Ambler class A and class B genes were not detected. MLST analysis on the 79 isolates identified five sequence types (STs), which belonged to group 3 clonal complexes 369. ST1145Ox was the most frequently observed ST with a count of 56 out of 79 isolates (70.89%). MLST analysis for non-sensitive tigecycline isolates, which were revealed ST1145Ox and ST1417Ox as well. By using the MLVA assay, the 79 isolates could be grouped into a total of 64 distinct MTs with eleven clusters identified in them. Minimum spanning tree analysis defined seven different MLVA complexes (MCs) labeled MC1 to MC6 along with twenty singletons. The locus MLVA-AB_2396 demonstrated the highest Simpson's diversity index value at 0.829 among all loci tested in this study while also having one of the highest variety of tandem repeat species. Conclusion The molecular diversity and clonal affinities within the genomes of the CRAB strains were clearly evident, with the identification of ST1144Ox, ST1658Ox, and ST1646Oxqaq representing novel findings.
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Affiliation(s)
- Lin Xiong
- Department of Laboratory Medicine, The First People's Hospital of Zunyi (The Third Affiliated Hospital of Zunyi Medical University), Zunyi, China
| | - Chengmin Deng
- Scientific Research Center, The First People's Hospital of Zunyi (The Third Affiliated Hospital of Zunyi Medical University), Zunyi, China
| | - Guangwu Yang
- Department of Laboratory Medicine, The First People's Hospital of Zunyi (The Third Affiliated Hospital of Zunyi Medical University), Zunyi, China
| | - Meijing Shen
- Department of Laboratory Medicine, The First People's Hospital of Zunyi (The Third Affiliated Hospital of Zunyi Medical University), Zunyi, China
| | - Benhai Chen
- Department of Laboratory Medicine, The First People's Hospital of Zunyi (The Third Affiliated Hospital of Zunyi Medical University), Zunyi, China
| | - Rengui Tian
- Department of Laboratory Medicine, The First People's Hospital of Zunyi (The Third Affiliated Hospital of Zunyi Medical University), Zunyi, China
| | - He Zha
- Department of Laboratory Medicine, The First People's Hospital of Zunyi (The Third Affiliated Hospital of Zunyi Medical University), Zunyi, China
| | - Kaifeng Wu
- Department of Laboratory Medicine, The First People's Hospital of Zunyi (The Third Affiliated Hospital of Zunyi Medical University), Zunyi, China
- Scientific Research Center, The First People's Hospital of Zunyi (The Third Affiliated Hospital of Zunyi Medical University), Zunyi, China
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Feuerschuette OHM, Alves EV, Scheffer MC, Vilela APP, Barazzetti FH, Feuerschuette HM, Cancelier ACL, Bazzo ML. Genetic diversity and antimicrobial resistance of invasive, noninvasive and colonizing group B Streptococcus isolates in southern Brazil. Access Microbiol 2022; 4:acmi000370. [PMID: 36004365 PMCID: PMC9394672 DOI: 10.1099/acmi.0.000370] [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: 09/01/2021] [Accepted: 05/12/2022] [Indexed: 11/18/2022] Open
Abstract
Introduction. Group B
Streptococcus
(GBS) is a human commensal bacterium that is also associated with infection in pregnant and non-pregnant adults, neonates and elderly people.
Gap Statement. The authors hypothesize that knowledge of regional GBS genetic patterns may allow the use of prevention and treatment measures to reduce the burden of streptococcal disease.
Aim. The aim was to report the genotypic diversity and antimicrobial sensitivity profiles of invasive, noninvasive urinary and colonizing GBS strains, and evaluate the relationships between these findings.
Methodology. The study included consecutive and non-duplicated GBS isolates recovered in southern Brazil from 2015 to 2017. We performed multiple-locus variable-number tandem repeat analysis (MLVA) and PCR analyses to determine capsular serotypes and identify the presence of the resistance genes mefA/E, ermB and ermA/TR, and also antibiotic susceptibility testing.
Results. The sample consisted of 348 GBS strains, 42 MLVA types were identified, and 4 of them represented 64 % of isolates. Serotype Ia was the most prevalent (42.2 %) and was found in a higher percentage associated with colonization, followed by serotypes V (24.4 %), II (17.8 %) and III (7.8 %). Serotype V was associated with invasive isolates and serotypes II and III with noninvasive isolates, without significant differences. All isolates were susceptible to penicillin. GBS 2018/ hvgA was observed in 17 isolates, with 11 belonging to serogroup III. The Hunter–Gaston diversity index was calculated as 0.879. The genes mefA/E, erm/B and erm/A/TR were found in 45, 19 and 46 isolates.
Conclusion. This report suggests that the circulating GBS belong to a limited number of genetic lineages. The most common genotypes were Ia/MT12 and V/MT18, which are associated with high resistance to macrolides and the presence of the genes mefA/E and ermA/TR. Penicillin remains the antibiotic of choice. Implementation of continuous surveillance of GBS infections will be essential to assess GBS epidemiology and develop accurate GBS prevention, especially strategies associated with vaccination.
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Affiliation(s)
- Otto Henrique May Feuerschuette
- Universidade do Sul de Santa Catarina – UNISUL, Tubarão, Brazil
- Hospital Universitário Professor Polydoro Ernani de São Thiago, HU/UFSC, Florianópolis, Brazil
| | - Eduardo Venâncio Alves
- Laboratório de Biologia Molecular, Microbiologia e Sorologias, HU/UFSC, Florianópolis, Brazil
| | - Mara Cristina Scheffer
- Laboratório de Biologia Molecular, Microbiologia e Sorologias, HU/UFSC, Florianópolis, Brazil
- Hospital Universitário Professor Polydoro Ernani de São Thiago, HU/UFSC, Florianópolis, Brazil
| | - Ana Paula Pessoa Vilela
- Laboratório de Biologia Molecular, Microbiologia e Sorologias, HU/UFSC, Florianópolis, Brazil
| | | | | | | | - Maria Luiza Bazzo
- Laboratório de Biologia Molecular, Microbiologia e Sorologias, HU/UFSC, Florianópolis, Brazil
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Ghamari M, Jabalameli F, Emaneini M, Beigverdi R. Multiple-locus variable-number tandem repeat analysis for genotyping of erythromycin-resistant group B streptococci in Iran. New Microbes New Infect 2022; 45:100957. [PMID: 35198219 PMCID: PMC8851280 DOI: 10.1016/j.nmni.2022.100957] [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: 04/28/2021] [Revised: 08/26/2021] [Accepted: 01/10/2022] [Indexed: 12/02/2022] Open
Abstract
Background Group B Streptococcus (GBS or S. agalactiae) is an important pathogen causing severe invasive diseases in neonates, pregnant women, and adults with underlying medical conditions. Methods To investigate the incidence of resistance to macrolide, lincosamide and streptogramin type B (MLSB) antibiotics, macrolide and tetracycline resistance determinants and genetic relationships, a total of 146 clinical isolates of GBS were collected from Tehran, Iran. The genetic relationships between erythromycin-resistant strains were determined by multilocus variable tandem repeat analysis (MLVA). Results All isolates were susceptible to penicillin, vancomycin, linezolid, and quinupristin–dalfopristin, but were resistant to tetracycline (96.6%, 141/146), erythromycin (28.1%, 41/146) and clindamycin (16.4%, 24/146). Among the 41 erythromycin-resistant GBS (ERGBS), the most common antimicrobial resistance gene was tetM detected in 92.7% (38/41) of the isolates followed by ermTR and ermB found in 65.8% (27/41) and 29.3% (12/41) of isolates, respectively. Of the 41 ERGBS, 95% (39/41) exhibited the constitutive MLSB phenotype, 2.4% (1/41) displayed inducible MLSB and 2.4% (1/41) had M phenotype. The erm methylase genes were widely related to MLSB phenotype isolates, while the mefA gene was associated with M phenotype. MLVA analysis performed on the 41 ERGBS revealed that 34 MLVA types (MTs). MLVA analysis showed that infections due to ERGBS have been caused by a variety of genotypes, suggesting that ERGBS were clonally unrelated and dissemination of these isolates was not due to a clonal outbreak. Conclusion Careful usage of macrolide antibiotics in therapy, continued surveillance of resistance rate and appropriate infection control measures can help to reduce spreading of resistance isolates.
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Beauruelle C, Treluyer L, Pastuszka A, Cochard T, Lier C, Mereghetti L, Glaser P, Poyart C, Lanotte P. CRISPR Typing Increases the Discriminatory Power of Streptococcus agalactiae Typing Methods. Front Microbiol 2021; 12:675597. [PMID: 34349737 PMCID: PMC8328194 DOI: 10.3389/fmicb.2021.675597] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 06/15/2021] [Indexed: 11/25/2022] Open
Abstract
We explored the relevance of a Clustered regularly interspaced short palindromic repeats (CRISPR)-based genotyping tool for Streptococcus agalactiae typing and we compared this method to current molecular methods [multi locus sequence typing (MLST) and capsular typing]. To this effect, we developed two CRISPR marker schemes (using 94 or 25 markers, respectively). Among the 255 S. agalactiae isolates tested, 229 CRISPR profiles were obtained. The 94 and 25 markers made it possible to efficiently separate isolates with a high diversity index (0.9947 and 0.9267, respectively), highlighting a high discriminatory power, superior to that of both capsular typing and MLST (diversity index of 0.9017 for MLST). This method has the advantage of being correlated with MLST [through analysis of the terminal direct repeat (TDR) and ancestral spacers] and to possess a high discriminatory power (through analysis of the leader-end spacers recently acquired, which are the witnesses of genetic mobile elements encountered by the bacteria). Furthermore, this “one-shot” approach presents the benefit of much-reduced time and cost in comparison with MLST. On the basis of these data, we propose that this method could become a reference method for group B Streptococcus (GBS) typing.
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Affiliation(s)
- Clémence Beauruelle
- Département de Bactériologie-Virologie, Hygiène Hospitalière et Parasitologie-Mycologie, Centre Hospitalier Régional Universitaire (CHRU) de Brest, Brest, France.,Inserm, EFS, UMR 1078, GGB, Universitè de Bretagne Occidentale, Brest, France
| | - Ludovic Treluyer
- Institut Cochin, Team Bacteria and Perinatality, INSERM U1016, Paris, France
| | - Adeline Pastuszka
- INRAE, ISP, Université de Tours, Tours, France.,Service de Bactériologie-Virologie, CHRU de Tours, Tours, France
| | | | - Clément Lier
- INRAE, ISP, Université de Tours, Tours, France.,Service de Bactériologie-Virologie, CHRU de Tours, Tours, France
| | - Laurent Mereghetti
- INRAE, ISP, Université de Tours, Tours, France.,Service de Bactériologie-Virologie, CHRU de Tours, Tours, France
| | - Philippe Glaser
- Evolution and Ecology of Resistance to Antibiotics (EERA) Unit, Institut Pasteur, Paris, France.,UMR CNRS 3525, Paris, France
| | - Claire Poyart
- Institut Cochin, Team Bacteria and Perinatality, INSERM U1016, Paris, France.,CNRS UMR 8104, Paris Descartes University, Paris, France.,Department of Bacteriology, University Hospitals Paris Centre-Cochin, Assistance Publique-Hôpitaux de Paris, Paris, France
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Su Y, Liu C, Deng Y, Cheng C, Ma H, Guo Z, Feng J. Molecular typing of Streptococcus agalactiae isolates of serotype Ia from tilapia in southern China. FEMS Microbiol Lett 2020; 366:5531764. [PMID: 31299078 DOI: 10.1093/femsle/fnz154] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 07/11/2019] [Indexed: 01/23/2023] Open
Abstract
Streptococcus agalactiae is an important pathogen of tilapia causing enormous economic losses worldwide. In this study, multilocus sequence typing indicated that 75 S. agalactiae isolates from tilapia in southern China belonged to sequence type-7, as well as belonging to serotype Ia, as confirmed by multiplex PCR assay. The putative-virulence gene profiles and genetic variation of these strains were determined by three sets of multiplex PCR and multi-virulence locus sequencing typing (MVLST), respectively. Analysis of putative-virulence gene profiles showed that each strain harbored 18 putative-virulence genes but lacked lmb and scpB. Three putative-virulence genes (srr-1, bibA and fbsA) were further selected for MVLST analysis. Our data showed that the strains had 14 MVLST types (1-14) and clustered in three groups (Groups I-Ⅲ). The period of time during 2013 and 2014 was an important turning point for the differentiation of the putative-virulence genes of S. agalactiae, as type 1 within Group Ⅱ became the predominant MVLST type. There were significant differences in MVLST types of S. agalactiae isolated from different tilapia farming regions. MVLST assay may improve the discriminatory power and is suitable for understanding the epidemiology of S. agalactiae serotype Ia and screening multivalent vaccine candidate strains.
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Affiliation(s)
- Youlu Su
- Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, Guangdong Province, PR China
| | - Chan Liu
- Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, Guangdong Province, PR China.,College of Fisheries, Tianjin Agricultural University, Tianjin 300384, PR China
| | - Yiqin Deng
- Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, Guangdong Province, PR China
| | - Changhong Cheng
- Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, Guangdong Province, PR China
| | - Hongling Ma
- Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, Guangdong Province, PR China
| | - Zhixun Guo
- Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, Guangdong Province, PR China
| | - Juan Feng
- Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, Guangdong Province, PR China
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Florindo C, Barroco CA, Silvestre I, Damião V, Gomes JP, Spellerberg B, Santos-Sanches I, Borrego MJ. Capsular Type, Sequence Type and Microbial Resistance Factors Impact on DNase Activity of Streptococcus agalactiae Strains from Human and Bovine Origin. Eur J Microbiol Immunol (Bp) 2018; 8:149-154. [PMID: 30719332 PMCID: PMC6348702 DOI: 10.1556/1886.2018.00026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 10/13/2018] [Indexed: 12/20/2022] Open
Abstract
Extracellular deoxyribonucleases (DNases) contribute to the spread of pathogenic bacteria through the evasion from host innate immunity. Our main objective was to evaluate the production of extracellular DNases by human and bovine Streptococcus agalactiae clinical strains and perform a correlation of genetic lineages and DNase activity with capsular type, genetic determinants, clinical origin (colonization and infection), and host (human or bovine). DNase activity was evaluated by qualitative and quantitative assays for a collection of 406 human (n = 285) and bovine (n = 121) strains. All (121/121) bovine were isolated from mastitis and revealed to be DNase (+), indicating a putative pathogenic role in this clinical scenario. From the human S. agalactiae strains, 86% (245/285) showed DNase activity, among which all strains belonging to capsular types, namely, Ia, Ib, III-2, and IV. All CC17 strains (n = 58) and 56/96 (58.3%) of the CC19 displayed DNase activity. DNase (-) strains belonged to the CC19 group. However, the subcharacterization of CC19 S. agalactiae strains through multiple-locus variable number tandem repeat analysis (MLVA), antibiotic resistance, mobile elements, and surface proteins did not provide any distinction among DNase producers and non-producers. The production of DNases by all human CC17 strains, about two-fifths of human CC19, and all bovine strains, suggest an important contribution of DNases to hypervirulence.
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Affiliation(s)
- Carlos Florindo
- Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Departamento de Ciências da Vida, UCIBIO
- Department of Infectious Diseases, National Institute of Health, Lisbon
| | - Cinthia Alves Barroco
- Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Departamento de Ciências da Vida, UCIBIO
| | - Inês Silvestre
- Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Departamento de Ciências da Vida, UCIBIO
- Department of Infectious Diseases, National Institute of Health, Lisbon
| | - Vera Damião
- Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Departamento de Ciências da Vida, UCIBIO
- Department of Infectious Diseases, National Institute of Health, Lisbon
| | - João Paulo Gomes
- Department of Infectious Diseases, National Institute of Health, Lisbon
| | | | - Ilda Santos-Sanches
- Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Departamento de Ciências da Vida, UCIBIO
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Two Overlapping Clusters of Group B Streptococcus Late-onset Disease in a Neonatal Intensive Care Unit. Pediatr Infect Dis J 2018; 37:1160-1164. [PMID: 29561513 DOI: 10.1097/inf.0000000000001987] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
OBJECTIVES Current predominant routes of group B Streptococcus (GBS) transmission in preterm neonates admitted to neonatal intensive care unit (NICU) are poorly defined. We report 2 overlapping clusters of GBS late-onset disease (LOD) from June to September 2015 in an Italian NICU. METHODS During the outbreak, possible sources of transmission (equipment, feeding bottles and breast pumps) were swabbed. Specimens from throat and rectum were collected on a weekly basis from all neonates admitted to NICU. Colonized or infected neonates had cohorting. Bacterial isolates were characterized by serologic and molecular typing methods. RESULTS GBS was isolated in 2 full-term and 7 preterm neonates. Strains belonged to serotype III, with 3 different sequence types (ST17, ST182 and ST19). Full-term neonates were colonized with GBS strains unrelated to the clusters (ST182 and ST19). Two distinct ST17 strains caused 2 clusters in preterm neonates: a first cluster with 1 case of LOD and a second, larger cluster with 6 LOD in 5 neonates (one of them had recurrence). ST17 strains were isolated from vaginorectal and milk samples of 2 mothers. Two preterm neonates had no evidence of colonization for weeks, until they presented with LOD. CONCLUSIONS Molecular analyses identified the presence of multiclonal GBS strains and 2 clusters of 7 cases of GBS-LOD. The dynamics of transmission of GBS within the NICU were complex. Breast milk was suspected to be one of the possible sources. In a research setting, the screening of GBS carrier mothers who deliver very preterm could contribute to the tracking of GBS transmission.
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Perinatal Streptococcus agalactiae Epidemiology and Surveillance Targets. Clin Microbiol Rev 2018; 31:31/4/e00049-18. [PMID: 30111577 DOI: 10.1128/cmr.00049-18] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Streptococcus agalactiae, or group B streptococcus (GBS), is a major neonatal pathogen. Recent data have elucidated the global prevalence of maternal and neonatal colonization, but gaps still remain in the epidemiology of this species. A number of phenotypic and genotypic classifications can be used to identify the diversity of GBS strains, and some are more discriminatory than others. This review explores the main schemes used for GBS epidemiology and further details the targets for epidemiological surveillance. Current screening practices across the world provide a unique opportunity to gain detailed information on maternal colonizing strains and neonatal disease-causing strains, which is vital for monitoring and therapeutics, if sufficient detail can be extracted. Deciphering which isolates are circulating within specific populations and recording targets within invasive strains are crucial steps in monitoring the implementation of therapeutics, such as vaccines, as well as developing novel therapies against prevalent GBS strains. Having a detailed understanding of global GBS epidemiology will prove invaluable for understanding the pathogenesis of this organism and equipping future prevention strategies for success.
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Multiple-Locus Variable Number Tandem Repeat Analysis (MLVA) and Tandem Repeat Sequence Typing (TRST), helpful tools for subtyping Staphylococcus lugdunensis. Sci Rep 2018; 8:11669. [PMID: 30076395 PMCID: PMC6076266 DOI: 10.1038/s41598-018-30144-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 06/04/2018] [Indexed: 01/21/2023] Open
Abstract
Staphylococcus lugdunensis is an emergent virulent coagulase-negative Staphylococcus that is increasingly responsible for severe infections. In an attempt to generate informative sequence data for subtyping S. lugdunensis, we selected and sequenced seven polymorphic variable number of tandem repeats (VNTRs) to develop two new methods: a classic length-based multiple-locus VNTR analysis (MLVA) method and a tandem repeat sequence typing (TRST) method. We assessed their performances compared to two existing methods, multilocus sequence typing (MLST) and multivirulence-locus sequence typing (MVLST) for 128 isolates from diverse clinical settings and geographical origins. The clustering achieved by the four methods was highly congruent, with MLVA discriminating within clonal complexes as defined by MLST. Indeed, MLVA was highly discriminant compared to MLST and MVLST in terms of number of genotypes as well as diversity indexes. Sequencing of the seven VNTRs showed that they were stable, and analysis of sequence polymorphisms provided superior discriminatory power. The typeability, reproducibility, and epidemiological concordance of these new methods were excellent. Of note, no link between clustering and clinical settings was identified. This study demonstrates that MLVA and TRST provide valuable information for molecular epidemiological study of S. lugdunensis, and represent promising tools to distinguish between strains of homogenous lineages in this clonal species.
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12
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Beauruelle C, Pastuszka A, Mereghetti L, Lanotte P. Group B Streptococcus Vaginal Carriage in Pregnant Women as Deciphered by Clustered Regularly Interspaced Short Palindromic Repeat Analysis. J Clin Microbiol 2018; 56:e01949-17. [PMID: 29618502 PMCID: PMC5971545 DOI: 10.1128/jcm.01949-17] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 03/28/2018] [Indexed: 11/20/2022] Open
Abstract
We evaluated the diversity of group B Streptococcus (GBS) vaginal carriage populations in pregnant women. For this purpose, we studied each isolate present in a primary culture of a vaginal swab using a new approach based on clustered regularly interspaced short palindromic repeats (CRISPR) locus analysis. To evaluate the CRISPR array composition rapidly, a restriction fragment length polymorphism (RFLP) analysis was performed. For each different pattern observed, the CRISPR array was sequenced and capsular typing and multilocus sequence typing (MLST) were performed. A total of 970 isolates from 10 women were analyzed by CRISPR-RFLP. Each woman carrying GBS isolates presented one to five specific "personal" patterns. Five women showed similar isolates with specific and unique restriction patterns, suggesting the carriage of a single GBS clone. Different patterns were observed among isolates from the other five women. For three of these, CRISPR locus sequencing highlighted low levels of internal modifications in the locus backbone, whereas there were high levels of modifications for the last two women, suggesting the carriage of two different clones. These two clones were closely related, having the same ancestral spacer(s), the same capsular type and, in one case, the same ST, but showed different antibiotic resistance patterns in pairs. Eight of 10 women were colonized by a single GBS clone, while two of them were colonized by two strains, leading to a risk of selection of more-virulent and/or more-resistant clones during antibiotic prophylaxis. This CRISPR analysis made it possible to separate isolates belonging to a single capsular type and sequence type, highlighting the greater discriminating power of this approach.
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Affiliation(s)
- Clemence Beauruelle
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Tours, France
- INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly, France
- CHRU de Tours, Service de Bactériologie-Virologie, Tours, France
| | - Adeline Pastuszka
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Tours, France
- INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly, France
- CHRU de Tours, Service de Bactériologie-Virologie, Tours, France
| | - Laurent Mereghetti
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Tours, France
- INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly, France
- CHRU de Tours, Service de Bactériologie-Virologie, Tours, France
| | - Philippe Lanotte
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Tours, France
- INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly, France
- CHRU de Tours, Service de Bactériologie-Virologie, Tours, France
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13
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Khodaei F, Sadeghi Kalani B, Alizadeh N, Hassani A, Najafi M, Kalantar E, Amini A, Aghazadeh M. Genotyping and Phylogenetic Analysis of Group B Streptococcus by Multiple Locus Variable Number Tandem Repeat Analysis in Iran. Galen Med J 2018; 7:e1121. [PMID: 34466437 PMCID: PMC8344184 DOI: 10.22086/gmj.v0i0.1121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/08/2018] [Accepted: 03/10/2018] [Indexed: 11/30/2022] Open
Abstract
Background: Group B streptococcus (GBS), also known as Streptococcus agalactiae, is well known as a causative agent for neonatal invasive diseases; it is also a major pathogen in adults. Analytic epidemiology is required to monitor the clinical isolates of GBS. However, there is insufficient information on the genetic background of GBS in Iran, and this information is needed to guide and develop a GBS vaccine. Materials and Methods: In total, 90 well-char - acterized GBS isolates were collected from April 2014 to August 2015. In this study, molecular typing was used to disclose a relationship between the multiple-locus variable number tandem repeat analysis (MLVA) types, serotyping, and pilus islands. The isolates were characterized by the types of capsular polysaccharides and pilus islands and were examined by MLVA to study the epidemiological relationship of isolates. Results: The results indicate that there is a significant relationship between the distribution of serotypes and pilus island genes; GBS isolates were differentiated into 12 types by capsular polysaccharides and pilus islands analysis. The discriminatory power of an MLVA analysis was high based on the five most variable numbers of tandem repeat loci and 44 MLVA types that were identified. Conclusion: This study has provided useful insights into the genetic heterogeneity of GBS isolates in Tehran and Alborz, Iran. The extensive distribution of pilus islands in various serotypes and MLVA types throughout the GBS population refers to the advancement of the pilus-based GBS vaccines.
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Affiliation(s)
- Farzaneh Khodaei
- Immunology Research Center, Department of Medical Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | | | - Naser Alizadeh
- Department of Medical Microbiology, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Alka Hassani
- Immunology Research Center, Department of Medical Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Najafi
- Department of Biochemistry, Iran University of Medical Sciences, Tehran, Iran
| | - Enayatollah Kalantar
- Department of Microbiology and Immunology, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran
| | - Abbas Amini
- School of Computing, Engineering and Mathematics, University of Western Sydney, Kings wood, NSW 2751, Australia
| | - Mohammad Aghazadeh
- Immunology Research Center, Department of Medical Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
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14
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Li L, Wang R, Huang Y, Huang T, Luo F, Huang W, Yang X, Lei A, Chen M, Gan X. High Incidence of Pathogenic Streptococcus agalactiae ST485 Strain in Pregnant/Puerperal Women and Isolation of Hyper-Virulent Human CC67 Strain. Front Microbiol 2018; 9:50. [PMID: 29467722 PMCID: PMC5808242 DOI: 10.3389/fmicb.2018.00050] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 01/10/2018] [Indexed: 01/02/2023] Open
Abstract
Group B streptococcus (GBS) is the major pathogen causing diseases in neonates, pregnant/puerperal women, cows and fish. Recent studies have shown that GBS may be infectious across hosts and some fish GBS strain might originate from human. The purpose of this study is to investigate the genetic relationship of CC103 strains that recently emerged in cows and humans, and explore the pathogenicity of clinical GBS isolates from human to tilapia. Ninety-two pathogenic GBS isolates were identified from 19 patients with different diseases and their evolution and pathogenicity to tilapia were analyzed. The multilocus sequence typing revealed that clonal complex (CC) 103 strain was isolated from 21.74% (20/92) of patients and ST485 strain was from 14.13% (13/92) patients with multiple diseases including neonates. Genomic evolution analysis showed that both bovine and human CC103 strains alternately form independent evolutionary branches. Three CC67 isolates carried gbs2018-C gene and formed one evolutionary branch with ST61 and ST67 strains that specifically infect dairy cows. Studies of interspecies transmission to tilapia found that 21/92 (22.83%) isolates including all ST23 isolates were highly pathogenic to tilapia and demonstrated that streptococci could break through the blood-brain barrier into brain tissue. In conclusions, CC103 strains are highly prevalent among pathogenic GBS from humans and have evolved into the highly pathogenic ST485 strains specifically infecting humans. The CC67 strains isolated from cows are able to infect humans through evolutionary events of acquiring CC17-specific type C gbs2018 gene and others. Human-derived ST23 pathogenic GBS strains are highly pathogenic to tilapia.
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Affiliation(s)
- Liping Li
- Guangxi Key Laboratory for Aquatic Genetic Breeding and Healthy Aquaculture, Guangxi Institute of Fisheries, Nanning, China.,Bacteria Laboratory, Guangxi Center for Disease Control and Prevention, Nanning, China
| | - Rui Wang
- Guangxi Key Laboratory for Aquatic Genetic Breeding and Healthy Aquaculture, Guangxi Institute of Fisheries, Nanning, China.,Institute of Animal Science and Technology, Guangxi University, Nanning, China
| | - Yan Huang
- Bacteria Laboratory, Guangxi Center for Disease Control and Prevention, Nanning, China
| | - Ting Huang
- Guangxi Key Laboratory for Aquatic Genetic Breeding and Healthy Aquaculture, Guangxi Institute of Fisheries, Nanning, China
| | - Fuguang Luo
- Liuzhou's Aquaculture Technology Extending Station, Liuzhou, China
| | - Weiyi Huang
- Institute of Animal Science and Technology, Guangxi University, Nanning, China
| | - Xiuying Yang
- School of Public Health, National Medical College of Right Rivers, Baise, China
| | - Aiying Lei
- Guangxi Key Laboratory for Aquatic Genetic Breeding and Healthy Aquaculture, Guangxi Institute of Fisheries, Nanning, China
| | - Ming Chen
- Guangxi Key Laboratory for Aquatic Genetic Breeding and Healthy Aquaculture, Guangxi Institute of Fisheries, Nanning, China.,Bacteria Laboratory, Guangxi Center for Disease Control and Prevention, Nanning, China.,Institute of Animal Science and Technology, Guangxi University, Nanning, China
| | - Xi Gan
- Guangxi Key Laboratory for Aquatic Genetic Breeding and Healthy Aquaculture, Guangxi Institute of Fisheries, Nanning, China
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15
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Beauruelle C, Pastuszka A, Horvath P, Perrotin F, Mereghetti L, Lanotte P. CRISPR: A Useful Genetic Feature to Follow Vaginal Carriage of Group B Streptococcus. Front Microbiol 2017; 8:1981. [PMID: 29075246 PMCID: PMC5641575 DOI: 10.3389/fmicb.2017.01981] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 09/25/2017] [Indexed: 11/16/2022] Open
Abstract
Clustered regularly interspaced short palindromic repeats (CRISPR) and Cas (CRISPR-associated proteins) play a critical role in adaptive immunity against mobile genetic elements, especially phages, through their ability to acquire novel spacer sequences. Polarized spacer acquisition results in spacer polymorphism and temporal organization of CRISPR loci, making them attractive epidemiological markers. Group B Streptococcus (GBS), a genital commensal for 10 to 30% of healthy women and a major neonatal pathogen, possesses a ubiquitous and functional CRISPR1 locus. Our aim was to assess the CRISPR1 locus as an epidemiological marker to follow vaginal carriage of GBS in women. This study also allowed us to observe the evolution of the CRISPR1 locus in response to probable phage infection occurring in vivo. We followed carriage of GBS among 100 women over an 11-year period, with a median duration of approximately 2 years. The CRISPR1 locus was highly conserved over time. The isolates that show the same CRISPR1 genotype were collected from 83% of women. There was an agreement between CRISPR genotyping and other typing methods [MLVA (multilocus variable number of tandem repeat Analysis) and MLST (multilocus sequence typing)] for 94% of the cases. The CRISPR1 locus of the isolates from 18 women showed modifications, four of which acquired polarized spacer, highlighting the in vivo functionality of the system. The novel spacer of one isolate had sequence similarity with phage, suggesting that phage infection occurred during carriage. These findings improve our understanding of CRISPR-Cas evolution in GBS and provide a glimpse of host-phage dynamics in vivo.
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Affiliation(s)
- Clémence Beauruelle
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Tours, France.,INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly, France.,Service de Bactériologie-Virologie, Centre Hospitalier Universitaire de Tours, Tours, France
| | - Adeline Pastuszka
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Tours, France.,INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly, France.,Service de Bactériologie-Virologie, Centre Hospitalier Universitaire de Tours, Tours, France
| | | | - Franck Perrotin
- Inserm U930, Université François Rabelais de Tours, Tours, France.,Département d'Obstétrique de Gynécologie et de Médecine Fœtale, Centre Hospitalier Universitaire de Tours, Tours, France
| | - Laurent Mereghetti
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Tours, France.,INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly, France.,Service de Bactériologie-Virologie, Centre Hospitalier Universitaire de Tours, Tours, France
| | - Philippe Lanotte
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Tours, France.,INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly, France.,Service de Bactériologie-Virologie, Centre Hospitalier Universitaire de Tours, Tours, France
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16
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Kang YX, Li XM, Piao DR, Tian GZ, Jiang H, Jia EH, Lin L, Cui BY, Chang YF, Guo XK, Zhu YZ. Typing Discrepancy Between Phenotypic and Molecular Characterization Revealing an Emerging Biovar 9 Variant of Smooth Phage-Resistant B. abortus Strain 8416 in China. Front Microbiol 2015; 6:1375. [PMID: 26696984 PMCID: PMC4672676 DOI: 10.3389/fmicb.2015.01375] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 11/19/2015] [Indexed: 11/23/2022] Open
Abstract
A newly isolated smooth colony morphology phage-resistant strain 8416 isolated from a 45-year-old cattle farm cleaner with clinical features of brucellosis in China was reported. The most unusual phenotype was its resistance to two Brucella phages Tbilisi and Weybridge, but sensitive to Berkeley 2, a pattern similar to that of Brucella melitensis biovar 1. VITEK 2 biochemical identification system found that both strain 8416 and B. melitensis strains shared positive ILATk, but negative in other B. abortus strains. However, routine biochemical and phenotypic characteristics of strain 8416 were most similar to that of B. abortus biovar 9 except CO2 requirement. In addition, multiple PCR molecular typing assays including AMOS-PCR, B. abortus special PCR (B-ab PCR) and a novel sub-biovar typing PCR, indicated that strain 8416 may belong to either biovar 3b or 9 of B. abortus. Surprisingly, further MLVA typing results showed that strain 8416 was most closely related to B. abortus biovar 3 in the Brucella MLVA database, primarily differing in 4 out of 16 screened loci. Therefore, due to the unusual discrepancy between phenotypic (biochemical reactions and particular phage lysis profile) and molecular typing characteristics, strain 8416 could not be exactly classified to any of the existing B. abortus biovars and might be a new variant of B. abortus biovar 9. The present study also indicates that the present phage typing scheme for Brucella sp. is subject to variation and the routine Brucella biovar typing needs further studies.
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Affiliation(s)
- Yao-Xia Kang
- Department of Immunology and Microbiology, Institutes of Medical Sciences, Shanghai Jiao Tong University School of Medicine Shanghai, China ; Baotou Municipal Center for Disease Control and Prevention Baotou, China
| | - Xu-Ming Li
- Department of Immunology and Microbiology, Institutes of Medical Sciences, Shanghai Jiao Tong University School of Medicine Shanghai, China
| | - Dong-Ri Piao
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention Beijing, China
| | - Guo-Zhong Tian
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention Beijing, China
| | - Hai Jiang
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention Beijing, China
| | - En-Hou Jia
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention Beijing, China
| | - Liang Lin
- Baotou Municipal Center for Disease Control and Prevention Baotou, China
| | - Bu-Yun Cui
- State Key Laboratory for Infectious Disease Prevention and Control, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention Beijing, China
| | - Yung-Fu Chang
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca NY, USA
| | - Xiao-Kui Guo
- Department of Immunology and Microbiology, Institutes of Medical Sciences, Shanghai Jiao Tong University School of Medicine Shanghai, China
| | - Yong-Zhang Zhu
- Department of Immunology and Microbiology, Institutes of Medical Sciences, Shanghai Jiao Tong University School of Medicine Shanghai, China ; Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca NY, USA
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17
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Development of Multiple-Locus Variable-Number Tandem-Repeat Analysis for Molecular Subtyping of Campylobacter jejuni by Using Capillary Electrophoresis. Appl Environ Microbiol 2015; 81:5318-25. [PMID: 26025899 DOI: 10.1128/aem.01151-15] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 05/21/2015] [Indexed: 12/28/2022] Open
Abstract
Campylobacter jejuni is a common cause of the frequently reported food-borne diseases in developed and developing nations. This study describes the development of multiple-locus variable-number tandem-repeat (VNTR) analysis (MLVA) using capillary electrophoresis as a novel typing method for microbial source tracking and epidemiological investigation of C. jejuni. Among 36 tandem repeat loci detected by the Tandem Repeat Finder program, 7 VNTR loci were selected and used for characterizing 60 isolates recovered from chicken meat samples from retail shops, samples from chicken meat processing factory, and stool samples. The discrimination ability of MLVA was compared with that of multilocus sequence typing (MLST). MLVA (diversity index of 0.97 with 31 MLVA types) provided slightly higher discrimination than MLST (diversity index of 0.95 with 25 MLST types). The overall concordance between MLVA and MLST was estimated at 63% by adjusted Rand coefficient. MLVA predicted MLST type better than MLST predicted MLVA type, as reflected by Wallace coefficient (Wallace coefficient for MLVA to MLST versus MLST to MLVA, 86% versus 51%). MLVA is a useful tool and can be used for effective monitoring of C. jejuni and investigation of epidemics caused by C. jejuni.
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18
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Lier C, Baticle E, Horvath P, Haguenoer E, Valentin AS, Glaser P, Mereghetti L, Lanotte P. Analysis of the type II-A CRISPR-Cas system of Streptococcus agalactiae reveals distinctive features according to genetic lineages. Front Genet 2015; 6:214. [PMID: 26124774 PMCID: PMC4466440 DOI: 10.3389/fgene.2015.00214] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 06/01/2015] [Indexed: 12/12/2022] Open
Abstract
CRISPR-Cas systems (clustered regularly interspaced short palindromic repeats/CRISPR-associated proteins) are found in 90% of archaea and about 40% of bacteria. In this original system, CRISPR arrays comprise short, almost unique sequences called spacers that are interspersed with conserved palindromic repeats. These systems play a role in adaptive immunity and participate to fight non-self DNA such as integrative and conjugative elements, plasmids, and phages. In Streptococcus agalactiae, a bacterium implicated in colonization and infections in humans since the 1960s, two CRISPR-Cas systems have been described. A type II-A system, characterized by proteins Cas9, Cas1, Cas2, and Csn2, is ubiquitous, and a type I–C system, with the Cas8c signature protein, is present in about 20% of the isolates. Unlike type I–C, which appears to be non-functional, type II-A appears fully functional. Here we studied type II-A CRISPR-cas loci from 126 human isolates of S. agalactiae belonging to different clonal complexes that represent the diversity of the species and that have been implicated in colonization or infection. The CRISPR-cas locus was analyzed both at spacer and repeat levels. Major distinctive features were identified according to the phylogenetic lineages previously defined by multilocus sequence typing, especially for the sequence type (ST) 17, which is considered hypervirulent. Among other idiosyncrasies, ST-17 shows a significantly lower number of spacers in comparison with other lineages. This characteristic could reflect the peculiar virulence or colonization specificities of this lineage.
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Affiliation(s)
- Clément Lier
- UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Foetal, Université de Tours, Tours France ; INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly France ; Service de Bactériologie-Virologie, Hôpital Bretonneau - Centre Hospitalier Régional et Universitaire de Tours, Tours France
| | - Elodie Baticle
- Service de Bactériologie-Virologie, Hôpital Bretonneau - Centre Hospitalier Régional et Universitaire de Tours, Tours France
| | | | - Eve Haguenoer
- UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Foetal, Université de Tours, Tours France ; INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly France
| | - Anne-Sophie Valentin
- UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Foetal, Université de Tours, Tours France ; INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly France ; Service de Bactériologie-Virologie, Hôpital Bretonneau - Centre Hospitalier Régional et Universitaire de Tours, Tours France
| | - Philippe Glaser
- Unité de Biologie des Bactéries Pathogènes à Gram Positif, Institut Pasteur, Paris France ; CNRS UMR 3525, Paris France
| | - Laurent Mereghetti
- UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Foetal, Université de Tours, Tours France ; INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly France ; Service de Bactériologie-Virologie, Hôpital Bretonneau - Centre Hospitalier Régional et Universitaire de Tours, Tours France
| | - Philippe Lanotte
- UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Foetal, Université de Tours, Tours France ; INRA, UMR1282 Infectiologie et Santé Publique, Nouzilly France ; Service de Bactériologie-Virologie, Hôpital Bretonneau - Centre Hospitalier Régional et Universitaire de Tours, Tours France
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19
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Kalmus P, Kramarenko T, Roasto M, Meremäe K, Viltrop A. Quality of raw milk intended for direct consumption in Estonia. Food Control 2015. [DOI: 10.1016/j.foodcont.2014.11.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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Patron K, Gilot P, Camiade E, Mereghetti L. An homolog of the Frz Phosphoenolpyruvate:carbohydrate phosphoTransferase System of extraintestinal pathogenic Escherichia coli is encoded on a genomic island in specific lineages of Streptococcus agalactiae. INFECTION GENETICS AND EVOLUTION 2015; 32:44-50. [PMID: 25733487 DOI: 10.1016/j.meegid.2015.02.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 02/17/2015] [Accepted: 02/19/2015] [Indexed: 10/23/2022]
Abstract
We identified a Streptococcus agalactiae metabolic region (fru2) coding for a Phosphoenolpyruvate:carbohydrate phosphoTransferase System (PTS) homologous to the Frz system of extraintestinal pathogenic Escherichia coli strains. The Frz system is involved in environmental sensing and regulation of the expression of adaptation and virulence genes in E. coli. The S. agalactiae fru2 region codes three subunits of a PTS transporter of the fructose-mannitol family, a transcriptional activator of PTSs of the MtlR family, an allulose-6 phosphate-3-epimerase, a transaldolase and a transketolase. We demonstrated that all these genes form an operon. The fru2 operon is present in a 17494-bp genomic island. We analyzed by multilocus sequence typing a population of 492 strains representative of the S. agalactiae population and we showed that the presence of the fru2 operon is linked to the phylogeny of S. agalactiae. The fru2 operon is always present within strains of clonal complexes CC 1, CC 7, CC 10, CC 283 and singletons ST 130 and ST 288, but never found in other CCs and STs. Our results indicate that the fru2 operon was acquired during the evolution of the S. agalactiae species from a common ancestor before the divergence of CC 1, CC 7, CC 10, CC 283, ST 130 and ST 288. As S. agalactiae strains of CC 1 and CC 10 are frequently isolated from adults with invasive disease, we hypothesize that the S. agalactiae Fru2 system senses the environment to allow the bacterium to adapt to new conditions encountered during the infection of adults.
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Affiliation(s)
- Kévin Patron
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Fœtal, F-37032 Tours, France; INRA, UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Fœtal, F-37380 Nouzilly, France
| | - Philippe Gilot
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Fœtal, F-37032 Tours, France; INRA, UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Fœtal, F-37380 Nouzilly, France.
| | - Emilie Camiade
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Fœtal, F-37032 Tours, France; INRA, UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Fœtal, F-37380 Nouzilly, France
| | - Laurent Mereghetti
- Université François Rabelais de Tours, UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Fœtal, F-37032 Tours, France; INRA, UMR1282 Infectiologie et Santé Publique, Bactéries et Risque Materno-Fœtal, F-37380 Nouzilly, France; CHRU de Tours, Service de Bactériologie-Virologie, F-37044 Tours, France
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21
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Beigverdi R, Jabalameli F, Mirsalehian A, Hantoushzadeh S, Boroumandi S, Taherikalani M, Emaneini M. Virulence factors, antimicrobial susceptibility and molecular characterization of Streptococcus agalactiae isolated from pregnant women. Acta Microbiol Immunol Hung 2014; 61:425-34. [PMID: 25496971 DOI: 10.1556/amicr.61.2014.4.4] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Forty-one Streptococcus agalactiae isolates collected from pregnant women at 35-37 weeks of gestation were analysed for their capsular types, antimicrobial resistance determinants, distribution of virulence factors and genetic relatedness using PCR and multiplex PCR. Capsular type III was predominant (65.8%), followed by capsular type II (14.6%), Ib (7.3%), and V(4.9%). All isolates were susceptible to penicillin, vancomycin, linezolid and quinupristin-dalfopristin. Resistance to tetracycline, erythromycin and clindamycin were found in 97.6%, 24.4%, and 14.6% of isolates, respectively. The most common antimicrobial resistance gene was tetM found in 97.6% of the isolates followed by ermTR and ermB found in 12% and 7.3% of isolates, respectively. The most common virulence gene was hly (100%), followed by scpB (97.6%), bca (97.6%), rib (53.65%) and bac (4.9%). The insertion sequence IS1548 was found in 63.4% of isolates. By multi locus variable number of tandem repeat analysis (MLVA) typing, 30 different allelic profiles or MLVA types (MTs) were identified. The most frequent was the MT1 (5/41, 12.2%) and followed by MT2 (4/41, 9.75%). Our data revealed that population structure of these isolates is highly diverse and indicates different MLVA types.
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Affiliation(s)
- Reza Beigverdi
- 1 Tehran University of Medical Sciences Department of Microbiology, School of Medicine Tehran Iran
| | - Fereshteh Jabalameli
- 1 Tehran University of Medical Sciences Department of Microbiology, School of Medicine Tehran Iran
| | - Akbar Mirsalehian
- 1 Tehran University of Medical Sciences Department of Microbiology, School of Medicine Tehran Iran
| | - Sedigheh Hantoushzadeh
- 2 Tehran University of Medical Sciences Maternal, Fetal and Neonatal Research Center, Vali-asr Hospital Tehran Iran
| | | | - Morovat Taherikalani
- 4 Ilam University of Medical Sciences Clinical Microbiology Research Center Ilam Iran
| | - Mohammad Emaneini
- 1 Tehran University of Medical Sciences Department of Microbiology, School of Medicine Tehran Iran
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Yao Y, Cui X, Chen Q, Huang X, Elmore B, Pan Q, Wang S, Liu J. Multiple-locus variable number of tandem repeats analysis of Salmonella enterica serotype paratyphi A from Yuxi and comparison with isolates from the Chinese Medical Culture Collection Center. Mol Med Rep 2014; 10:68-74. [PMID: 24788795 PMCID: PMC4068728 DOI: 10.3892/mmr.2014.2187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2013] [Accepted: 03/18/2014] [Indexed: 11/06/2022] Open
Abstract
The aim of the present study was to genotype Salmonella enterica serotype paratyphi A (SPA) isolated from Yuxi, China, in a multiple-locus variable number of tandem repeats (VNTRs) analysis (MLVA) and to compare them with isolates from the Chinese Medical Culture Collection Center (CMCC). Potential VNTRs were screened from the genomes of ATCC9150 and AKU_12601 using the Tandem Repeats Finder program. Nine VNTRs were established for MLVA typing of 195 SPA isolates from Yuxi and 20 isolates from CMCC. The dendogram for MLVA profiles and minimum spanning tree (MST) were drawn using the categorical coefficient calculated by BioNumerics software. A total of 23 MLVA types were identified in 215 SPA isolates and were grouped into six distinct cluster groups A, B, C, D, E and F. A total of 195 Yuxi SPA isolates were exclusively grouped into cluster C with nine MLVA genotypes. A total of 20 CMCC isolates were grouped in clusters A B, D, E and F with the other 14 MLVA types. The MLVA with nine VNTR loci, which was exploited in the present study, represents a successful strategy for genotyping SPA. Furthermore, the 195 Yuxi isolates appear to be closely related to each other and distinct from the 20 CMCC strains.
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Affiliation(s)
- Yingbo Yao
- Center for Disease Control and Prevention of Yuxi City, Yuxi, Yunnan 653100, P.R. China
| | - Xiaoyan Cui
- Translational Center for Stem Cell Research, Tongji Hospital, Stem Cell Research Center, Tongji University School of Medicine, Shanghai 200065, P.R. China
| | - Qingshan Chen
- Department of Epidemiology, School of Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Xinrong Huang
- Huanggang Maternal and Child Care Service Centre, Huanggang, Hubei 438100, P.R. China
| | - Bradley Elmore
- College of Pharmacy, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA
| | - Qing Pan
- Department of Medical Microbiology, Yongzhou Vocational and Technical College,Yongzhou, Hunan 425006, P.R. China
| | - Shukun Wang
- Center for Disease Control and Prevention of Yuxi City, Yuxi, Yunnan 653100, P.R. China
| | - Jie Liu
- Translational Center for Stem Cell Research, Tongji Hospital, Stem Cell Research Center, Tongji University School of Medicine, Shanghai 200065, P.R. China
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Otaguiri ES, Morguette AEB, Tavares ER, dos Santos PMC, Morey AT, Cardoso JD, Perugini MRE, Yamauchi LM, Yamada-Ogatta SF. Commensal Streptococcus agalactiae isolated from patients seen at University Hospital of Londrina, Paraná, Brazil: capsular types, genotyping, antimicrobial susceptibility and virulence determinants. BMC Microbiol 2013; 13:297. [PMID: 24359590 PMCID: PMC3878097 DOI: 10.1186/1471-2180-13-297] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2013] [Accepted: 12/16/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Streptococcus agalactiae or Group B Streptococci (GBS) have the ability to access various host sites, which reflects its adaptability to different environments during the course of infection. This adaptation is due to the expression of virulence factors that are involved with survival, invasion and bacterial persistence in the host. This study aimed to characterize GBS isolates from women of reproductive age seen at University Hospital of Londrina, according to capsular typing, genetic relatedness, antimicrobial susceptibility profile and occurrence of virulence determinants. RESULTS A total of 83 GBS isolates were enrolled in this study. Capsular types Ia (42.2%), II (10.8%), III (14.5%) and V (30.1%) were identified in most GBS. One isolate each was classified as type IX and non-typeable.A total of 15 multiple locus variable number of tandem repeat analysis (MLVA) types were identified among the isolates, seven were singletons and eight were represented by more than four isolates. All isolates were susceptible to penicillin, ampicillin, cefepime, cefotaxime, chloramphenicol, levofloxacin and vancomycin. Resistance to erythromycin and clindamycin was observed in 19.3 and 13.3% of isolates, respectively. All isolates resistant to clindamycin were simultaneously resistant to erythromycin and were distributed in the capsular types III and V. One isolate showed the constitutive macrolide-lincosamide-streptogramin B (cMLS(B)) phenotype and ten showed the inducible MLS(B) (iMLS(B)) phenotype. The mechanism of resistance to erythromycin and clindamycin more prevalent among these isolates was mediated by the gene ermA, alone or in combination with the gene ermB. The isolates displaying resistance only to erythromycin belonged to capsular type Ia, and showed the M phenotype, which was mediated by the mefA/E gene. All isolates harbored the gene hylB and at least one pilus variant, PI-1, PI-2a or PI-2b. Although cylE was observed in all GBS, four isolates were classified as gamma-hemolytic and carotenoid pigment non-producers. CONCLUSIONS Our results indicate the potential virulence of commensal GBS isolates, reinforcing the need for continued screening for this bacterium to prevent infections. The distribution of capsular and pili antigens, and MLVA profiles was also identified, which may contribute to the development of new strategies for the prevention and treatment of GBS infection.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Sueli Fumie Yamada-Ogatta
- Laboratório de Biologia Molecular de Microrganismos, Departamento de Microbiologia, Centro de Ciências Biológicas, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, PR 445, km 380, Londrina, Paraná, CEP 86057-970, Brazil.
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Matejusova I, Bain N, Colquhoun DJ, Feil EJ, McCarthy U, McLennan D, Snow M, Verner-Jeffreys D, Wallace IS, Weir SJ, Hall M. Multilocus variable-number tandem-repeat genotyping of Renibacterium salmoninarum, a bacterium causing bacterial kidney disease in salmonid fish. BMC Microbiol 2013; 13:285. [PMID: 24313994 PMCID: PMC4029610 DOI: 10.1186/1471-2180-13-285] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Accepted: 11/15/2013] [Indexed: 11/15/2022] Open
Abstract
Background Bacterial kidney disease (BKD), caused by Renibacterium salmoninarum, is a bacterial disease of fish, which is both geographically widespread and difficult to control. Previously, application of various molecular typing methods has failed to reliably discriminate between R. salmoninarum isolates originating from different host species and geographic areas. The current study aimed to utilize multilocus variable number tandem repeats (VNTR) to investigate inter-strain variation of R. salmoninarum to establish whether host-specific populations exist in Atlantic salmon and rainbow trout respectively. Such information would be valuable in risk assessment of transmission of R. salmoninarum in a multispecies aquaculture environment. Results The present analysis utilizing sixteen VNTRs distinguished 17 different haplotypes amongst 41 R. salmoninarum isolates originating from Atlantic salmon and rainbow trout in Scotland, Norway and the US. The VNTR typing system revealed two well supported groups of R. salmoninarum haplotypes. The first group included R. salmoninarum isolates originating from both Atlantic salmon and rainbow trout circulating in Scottish and Norwegian aquaculture, in addition to the type strain ATCC33209T originating from Chinook salmon in North America. The second group comprised isolates found exclusively in Atlantic salmon, of mainly wild origin, including isolates NCIB1114 and NCIB1116 associated with the original Dee disease in Scotland. Conclusions The present study confirmed that VNTR analysis can be successfully applied to discriminate R. salmoninarum strains. There was no clear distinction between isolates originating from Atlantic salmon and rainbow trout as several haplotypes in group 1 clustered together R. salmoninarum isolates from both species. These findings indicate a potential exchange of pathogens between Atlantic salmon and rainbow trout in Scottish and Norwegian aquaculture during the last 20 years. In a scenario of expansion of rainbow trout farming into the marine environment, appropriate biosecurity measures to minimize disease occurrence are advised. The present results also suggest that R. salmoninarum isolates circulating in European aquaculture over the last 20 years are genetically distant to the wild strains originally causing BKD in the rivers Dee and Spey.
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Affiliation(s)
- Iveta Matejusova
- Marine Scotland Science, Victoria Road, P,O, Box 101, Aberdeen AB11 9DB, UK.
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Lee S, Hwang KJ, Park MY, Hwang SD, Chai HY, Chu H, Park SH. Evaluation and Selection of Multilocus Variable-Number Tandem-Repeat Analysis Primers for Genotyping Brucella abortus Biovar 1 Isolated from Human Patients. Osong Public Health Res Perspect 2013; 4:265-70. [PMID: 24298442 PMCID: PMC3845229 DOI: 10.1016/j.phrp.2013.09.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 09/04/2013] [Accepted: 09/05/2013] [Indexed: 12/01/2022] Open
Abstract
Objectives Brucellosis is the most common bacterial zoonosis in the world. Multilocus variable-number tandem-repeat (VNTR) analysis (MLVA) is a molecular method for genotyping bacterial species. Brucella abortus biovar I was isolated from most of the brucellosis-suspected patients in Korea. This study was conducted to investigate the ability of various MLVA primers that are used for molecular typing B. abortus isolates and for analyzing their epidemiological data. Methods A total of 80 human isolates of B. abortus biovar I isolated from human patients and the reference strain were used for MLVA. Genetic diversity was determined by calculating the Simpson's diversity index (DI) of each VNTR locus. The Brucella strains were subcultured 30 times to determine the stability of each locus. The DNA of the strains cultivated in each passage was extracted and subjected to MLVA for further investigation. Results The 15 VNTR loci were selected based on high DI values. The DIs of the 15 VNTR loci showed considerable discrimination power ranging from 59% for Bruce 43 to 87% for Bruce 22. Bruce 09, Bruce 11, Bruce 16, Bruce 42, and Bruce 43 were confirmed to remain stable in vitro among the 15 VNTR loci selected. Conclusion The results of this study suggest that the five loci subsets may be a useful epidemiological tool for investigating B. abortus biovar 1 outbreak.
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Affiliation(s)
- Subok Lee
- Division of Zoonoses, Korea National Institute of Health, Osong, Korea
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Godoy D, Carvalho-Castro G, Leal C, Pereira U, Leite R, Figueiredo H. Genetic diversity and new genotyping scheme for fish pathogenic Streptococcus agalactiae. Lett Appl Microbiol 2013; 57:476-83. [DOI: 10.1111/lam.12138] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Revised: 07/05/2013] [Accepted: 07/17/2013] [Indexed: 12/01/2022]
Affiliation(s)
- D.T. Godoy
- AQUAVET - Laboratory of Aquatic Animal Diseases, Veterinary School; Federal University of Minas Gerais; Belo Horizonte Brazil
| | - G.A. Carvalho-Castro
- AQUAVET - Laboratory of Aquatic Animal Diseases, Veterinary School; Federal University of Minas Gerais; Belo Horizonte Brazil
| | - C.A.G. Leal
- AQUAVET - Laboratory of Aquatic Animal Diseases, Veterinary School; Federal University of Minas Gerais; Belo Horizonte Brazil
| | - U.P. Pereira
- AQUAVET - Laboratory of Aquatic Animal Diseases, Veterinary School; Federal University of Minas Gerais; Belo Horizonte Brazil
| | - R.C. Leite
- AQUAVET - Laboratory of Aquatic Animal Diseases, Veterinary School; Federal University of Minas Gerais; Belo Horizonte Brazil
| | - H.C.P. Figueiredo
- AQUAVET - Laboratory of Aquatic Animal Diseases, Veterinary School; Federal University of Minas Gerais; Belo Horizonte Brazil
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Multiple locus VNTR analysis highlights that geographical clustering and distribution of Dichelobacter nodosus, the causal agent of footrot in sheep, correlates with inter-country movements. INFECTION GENETICS AND EVOLUTION 2013; 22:273-9. [PMID: 23748018 PMCID: PMC3969714 DOI: 10.1016/j.meegid.2013.05.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 05/17/2013] [Accepted: 05/28/2013] [Indexed: 11/23/2022]
Abstract
Dichelobacter nodosus is a Gram-negative, anaerobic bacterium and the causal agent of footrot in sheep. Multiple locus variable number tandem repeat (VNTR) analysis (MLVA) is a portable technique that involves the identification and enumeration of polymorphic tandem repeats across the genome. The aims of this study were to develop an MLVA scheme for D. nodosus suitable for use as a molecular typing tool, and to apply it to a global collection of isolates. Seventy-seven isolates selected from regions with a long history of footrot (GB, Australia) and regions where footrot has recently been reported (India, Scandinavia), were characterised. From an initial 61 potential VNTR regions, four loci were identified as usable and in combination had the attributes required of a typing method for use in bacterial epidemiology: high discriminatory power (D>0.95), typeability and reproducibility. Results from the analysis indicate that D. nodosus appears to have evolved via recombinational exchanges and clonal diversification. This has resulted in some clonal complexes that contain isolates from multiple countries and continents; and others that contain isolates from a single geographic location (country or region). The distribution of alleles between countries matches historical accounts of sheep movements, suggesting that the MLVA technique is sufficiently specific and sensitive for an epidemiological investigation of the global distribution of D. nodosus.
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Dhakal R, Chauhan K, Seale RB, Deeth HC, Pillidge CJ, Powell IB, Craven H, Turner MS. Genotyping of dairy Bacillus licheniformis isolates by high resolution melt analysis of multiple variable number tandem repeat loci. Food Microbiol 2013; 34:344-51. [DOI: 10.1016/j.fm.2013.01.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Revised: 01/08/2013] [Accepted: 01/10/2013] [Indexed: 11/25/2022]
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Delannoy CMJ, Crumlish M, Fontaine MC, Pollock J, Foster G, Dagleish MP, Turnbull JF, Zadoks RN. Human Streptococcus agalactiae strains in aquatic mammals and fish. BMC Microbiol 2013. [PMID: 23419028 DOI: 10.1186/1471–2180–13–41] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In humans, Streptococcus agalactiae or group B streptococcus (GBS) is a frequent coloniser of the rectovaginal tract, a major cause of neonatal infectious disease and an emerging cause of disease in non-pregnant adults. In addition, Streptococcus agalactiae causes invasive disease in fish, compromising food security and posing a zoonotic hazard. We studied the molecular epidemiology of S. agalactiae in fish and other aquatic species to assess potential for pathogen transmission between aquatic species and humans. METHODS Isolates from fish (n = 26), seals (n = 6), a dolphin and a frog were characterized by pulsed-field gel electrophoresis, multilocus sequence typing and standardized 3-set genotyping, i.e. molecular serotyping and profiling of surface protein genes and mobile genetic elements. RESULTS Four subpopulations of S. agalactiae were identified among aquatic isolates. Sequence type (ST) 283 serotype III-4 and its novel single locus variant ST491 were detected in fish from Southeast Asia and shared a 3-set genotype identical to that of an emerging ST283 clone associated with invasive disease of adult humans in Asia. The human pathogenic strain ST7 serotype Ia was also detected in fish from Asia. ST23 serotype Ia, a subpopulation that is normally associated with human carriage, was found in all grey seals, suggesting that human effluent may contribute to microbial pollution of surface water and exposure of sea mammals to human pathogens. The final subpopulation consisted of non-haemolytic ST260 and ST261 serotype Ib isolates, which belong to a fish-associated clonal complex that has never been reported from humans. CONCLUSIONS The apparent association of the four subpopulations of S. agalactiae with specific groups of host species suggests that some strains of aquatic S. agalactiae may present a zoonotic or anthroponotic hazard. Furthermore, it provides a rational framework for exploration of pathogenesis and host-associated genome content of S. agalactiae strains.
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Affiliation(s)
- Christian M J Delannoy
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling, UK
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Delannoy CMJ, Crumlish M, Fontaine MC, Pollock J, Foster G, Dagleish MP, Turnbull JF, Zadoks RN. Human Streptococcus agalactiae strains in aquatic mammals and fish. BMC Microbiol 2013; 13:41. [PMID: 23419028 PMCID: PMC3585737 DOI: 10.1186/1471-2180-13-41] [Citation(s) in RCA: 121] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Accepted: 02/11/2013] [Indexed: 11/17/2022] Open
Abstract
Background In humans, Streptococcus agalactiae or group B streptococcus (GBS) is a frequent coloniser of the rectovaginal tract, a major cause of neonatal infectious disease and an emerging cause of disease in non-pregnant adults. In addition, Streptococcus agalactiae causes invasive disease in fish, compromising food security and posing a zoonotic hazard. We studied the molecular epidemiology of S. agalactiae in fish and other aquatic species to assess potential for pathogen transmission between aquatic species and humans. Methods Isolates from fish (n = 26), seals (n = 6), a dolphin and a frog were characterized by pulsed-field gel electrophoresis, multilocus sequence typing and standardized 3-set genotyping, i.e. molecular serotyping and profiling of surface protein genes and mobile genetic elements. Results Four subpopulations of S. agalactiae were identified among aquatic isolates. Sequence type (ST) 283 serotype III-4 and its novel single locus variant ST491 were detected in fish from Southeast Asia and shared a 3-set genotype identical to that of an emerging ST283 clone associated with invasive disease of adult humans in Asia. The human pathogenic strain ST7 serotype Ia was also detected in fish from Asia. ST23 serotype Ia, a subpopulation that is normally associated with human carriage, was found in all grey seals, suggesting that human effluent may contribute to microbial pollution of surface water and exposure of sea mammals to human pathogens. The final subpopulation consisted of non-haemolytic ST260 and ST261 serotype Ib isolates, which belong to a fish-associated clonal complex that has never been reported from humans. Conclusions The apparent association of the four subpopulations of S. agalactiae with specific groups of host species suggests that some strains of aquatic S. agalactiae may present a zoonotic or anthroponotic hazard. Furthermore, it provides a rational framework for exploration of pathogenesis and host-associated genome content of S. agalactiae strains.
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Affiliation(s)
- Christian M J Delannoy
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling, UK
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Fléchard M, Gilot P, Héry-Arnaud G, Mereghetti L, Rosenau A. Analysis and identification of IS1548insertion targets inStreptococcus agalactiae. FEMS Microbiol Lett 2013; 340:65-72. [DOI: 10.1111/1574-6968.12076] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 01/03/2013] [Accepted: 01/07/2013] [Indexed: 01/27/2023] Open
Affiliation(s)
- Maud Fléchard
- Université de Tours; UMR1282 Infectiologie et Santé Publique; Équipe “Bactéries et Risque Materno-Foetal”; Tours; France
| | | | | | | | - Agnès Rosenau
- Université de Tours; UMR1282 Infectiologie et Santé Publique; Équipe “Bactéries et Risque Materno-Foetal”; Tours; France
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Lanotte P, Perivier M, Haguenoer E, Mereghetti L, Burucoa C, Claverol S, Atanassov C. Proteomic biomarkers associated with Streptococcus agalactiae invasive genogroups. PLoS One 2013; 8:e54393. [PMID: 23372719 PMCID: PMC3553121 DOI: 10.1371/journal.pone.0054393] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Accepted: 12/11/2012] [Indexed: 11/18/2022] Open
Abstract
Group B streptococcus (GBS, Streptococcus agalactiae) is a leading cause of meningitis and sepsis in newborns and an etiological agent of meningitis, endocarditis, osteoarticular and soft tissue infections in adults. GBS isolates are routinely clustered in serotypes and in genotypes. At present one GBS sequence type (i.e. ST17) is considered to be closely associated with bacterial invasiveness and novel proteomic biomarkers could make a valuable contribution to currently available GBS typing data. For that purpose we analyzed the protein profiles of 170 genotyped GBS isolates by Surface-Enhanced Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (SELDI). Univariate statistical analysis of the SELDI profiles identified four protein biomarkers significantly discriminating ST17 isolates from those of the other sequence types. Two of these biomarkers (MW of 7878 Da and 12200 Da) were overexpressed and the other two (MW of 6258 Da and 10463 Da) were underexpressed in ST17. The four proteins were isolated by mass spectrometry-assisted purification and their tryptic peptides analyzed by LC-MS/MS. They were thereby identified as the small subunit of exodeoxyribonuclease VII, the 50S ribosomal protein L7/L12, a CsbD-like protein and thioredoxin, respectively. In conclusion, we identified four candidate biomarkers of ST17 by SELDI for high-throughput screening. These markers may serve as a basis for further studies on the pathophysiology of GBS infection, and for the development of novel vaccines.
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Affiliation(s)
- Philippe Lanotte
- Equipe “Bactéries et risque materno-fœtal”, UMR 1282 ISP, Université François Rabelais de Tours, Tours, France
- Equipe “Bactéries et risque materno-fœtal”, UMR 1282 ISP, INRA, Nouzilly, France
- Service de Bactériologie et de Virologie, CHRU de Tours, Tours, France
| | | | - Eve Haguenoer
- Equipe “Bactéries et risque materno-fœtal”, UMR 1282 ISP, Université François Rabelais de Tours, Tours, France
- Equipe “Bactéries et risque materno-fœtal”, UMR 1282 ISP, INRA, Nouzilly, France
- Service de Bactériologie et de Virologie, CHRU de Tours, Tours, France
| | - Laurent Mereghetti
- Equipe “Bactéries et risque materno-fœtal”, UMR 1282 ISP, Université François Rabelais de Tours, Tours, France
- Equipe “Bactéries et risque materno-fœtal”, UMR 1282 ISP, INRA, Nouzilly, France
- Service de Bactériologie et de Virologie, CHRU de Tours, Tours, France
| | - Christophe Burucoa
- Service de Bactériologie-Hygiène, CHU de Poitiers, Poitiers, France
- Equipe d'accueil 4331 “Laboratoire Inflammation, Tissus Epithéliaux et Cytokines”, Université de Poitiers, Poitiers, France
| | - Stéphane Claverol
- Pôle Protéomique - Centre de Génomique Fonctionnelle, Université Victor Segalen - Bordeaux 2, Bordeaux, France
| | - Christo Atanassov
- Service de Bactériologie-Hygiène, CHU de Poitiers, Poitiers, France
- Equipe d'accueil 4331 “Laboratoire Inflammation, Tissus Epithéliaux et Cytokines”, Université de Poitiers, Poitiers, France
- * E-mail:
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Radtke A, Bruheim T, Afset JE, Bergh K. Multiple-locus variant-repeat assay (MLVA) is a useful tool for molecular epidemiologic analysis of Streptococcus agalactiae strains causing bovine mastitis. Vet Microbiol 2012; 157:398-404. [PMID: 22266162 DOI: 10.1016/j.vetmic.2011.12.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2011] [Revised: 12/21/2011] [Accepted: 12/29/2011] [Indexed: 11/27/2022]
Abstract
Group B streptococci (GBS) were considered a major cause of mastitis in cattle until preventive measures succeeded in controlling the disease in the 1970s and 1980s. During the last 5-6 years an increasing number of cases have been observed in some Scandinavian countries. A total of 187 GBS isolates from mastitis cases were collected from 119 animals in 34 Norwegian farms in the period from April 2007 to November 2010. 133 (71%) of the isolates were from farms with automated milking systems. The strains underwent typing of capsular polysaccharides (CPS) and surface proteins, and were analyzed by multi-locus variable repeat assay (MLVA) to investigate the epidemiological relationship of strains within and between farms. The GBS strains were differentiated into 12 types by CPS and surface protein analysis, with CPS types V (54%) and IV (34%) predominating. MLVA was superior to CPS and protein typing for strain differentiation, resolving the 187 strains into 37 types. In 29 of 34 farms all GBS strains had identical MLVA profiles specific for each farm. However, in one farm represented with 48 isolates, four MLVA variants with differences in one repeat locus were observed during the almost 3-year long collection period. Similar variations were observed at four other farms. This might reflect the stability of repeat loci under in vivo conditions. Farms with automated milking systems were overrepresented in this material. In conclusion, the five-loci MLVA allowed rapid high-resolution genotyping of the bovine GBS strains within and between farms.
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Affiliation(s)
- Andreas Radtke
- Norwegian University of Science and Technology, Department of Laboratory Medicine, Children's and Women's Health, Trondheim, Norway.
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