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Rana C, Rajput S, Behera M, Gautam D, Vikas V, Vats A, Roshan M, Ghorai SM, De S. Global epidemiology of CTX-M-type β-lactam resistance in human and animal. Comp Immunol Microbiol Infect Dis 2022; 86:101815. [DOI: 10.1016/j.cimid.2022.101815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 04/05/2022] [Accepted: 04/12/2022] [Indexed: 11/30/2022]
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2
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Schuster CF, Weber RE, Weig M, Werner G, Pfeifer Y. Ultra-deep long-read sequencing detects IS-mediated gene duplications as a potential trigger to generate arrays of resistance genes and a mechanism to induce novel gene variants such as blaCTX-M-243. J Antimicrob Chemother 2022; 77:381-390. [PMID: 34865035 DOI: 10.1093/jac/dkab407] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 10/06/2021] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Extended-spectrum β-lactamases (ESBLs) are enzymes that can render their hosts resistant to various β-lactam antibiotics. CTX-M-type enzymes are the most prevalent ESBLs and the main cause of resistance to third-generation cephalosporins in Enterobacteriaceae. The number of described CTX-M types is continuously rising, currently comprising over 240 variants. During routine screening we identified a novel blaCTX-M gene. OBJECTIVES To characterize a novel blaCTX-M variant harboured by a multidrug-resistant Escherichia coli isolate of sequence type ST354. METHODS Antibiotic susceptibilities were determined using broth microdilution. Genome and plasmid sequences were reconstructed using short- and long-read sequencing. The novel blaCTX-M locus was analysed using long-read and Sanger sequencing. Plasmid polymorphisms were determined in silico on a single plasmid molecule level. RESULTS The novel blaCTX-M-243 allele was discovered alongside a nearly identical blaCTX-M-104-containing gene array on a 219 kbp IncHI2A plasmid. CTX-M-243 differed from CTX-M-104 by only one amino acid substitution (N109S). Ultra-deep (2300-fold coverage) long-read sequencing revealed dynamic scaling of the blaCTX-M genetic contexts from one to five copies. Further antibiotic resistance genes such as blaTEM-1 also exhibited sequence heterogeneity but were stable in copy number. CONCLUSIONS We identified the novel ESBL gene blaCTX-M-243 and illustrate a dynamic system of varying blaCTX-M copy numbers. Our results highlight the constant emergence of new CTX-M family enzymes and demonstrate a potential evolutionary platform to generate novel ESBL variants and possibly other antibiotic resistance genes.
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Affiliation(s)
- Christopher F Schuster
- Division of Nosocomial Pathogens and Antibiotic Resistance, Robert Koch Institute, Wernigerode, Germany
| | - Robert E Weber
- Division of Nosocomial Pathogens and Antibiotic Resistance, Robert Koch Institute, Wernigerode, Germany
| | - Michael Weig
- Institute for Medical Microbiology and Virology, University Medical Center Göttingen, Göttingen, Germany
| | - Guido Werner
- Division of Nosocomial Pathogens and Antibiotic Resistance, Robert Koch Institute, Wernigerode, Germany
| | - Yvonne Pfeifer
- Division of Nosocomial Pathogens and Antibiotic Resistance, Robert Koch Institute, Wernigerode, Germany
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Zhao QY, Chen PX, Yang L, Cai RM, Zhu JH, Fang LX, Webber MA, Jiang HX. Transmission of plasmid-borne and chromosomal blaCTX-M-64 among Escherichia coli and Salmonella isolates from food-producing animals via ISEcp1-mediated transposition. J Antimicrob Chemother 2021; 75:1424-1427. [PMID: 32108873 DOI: 10.1093/jac/dkaa044] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 01/14/2020] [Accepted: 01/28/2020] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES To clarify the transmission mechanism of the blaCTX-M-64 gene between Escherichia coli and Salmonella isolates from food animals. METHODS A total of 329 E. coli and 60 Salmonella isolates collected from food animals in 2016 were screened for the presence of blaCTX-M-64 genes. The blaCTX-M-64-positive isolates were typed and plasmid and chromosome DNA was sequenced to determine the genetic context of blaCTX-M-64 and the plasmid types present. RESULTS The blaCTX-M-64 gene was identified in only three E. coli isolates but was the predominant gene in the Salmonella isolates (n = 9). These 12 CTX-M-64-positive isolates were all resistant to ampicillin, cefotaxime, ceftiofur, ceftriaxone, ceftazidime and florfenicol and 9 were resistant to ciprofloxacin. The blaCTX-M-64 gene was located on transferable IncI2 plasmids and an IncHI2 plasmid in three E. coli and one Salmonella isolate, respectively. The remaining eight Salmonella isolates contained blaCTX-M-64 integrated into the chromosome. Different genetic contexts of blaCTX-M-64 genes were found among the 12 isolates: ISEcp1-blaCTX-M-64-orf477-A/C on IncI2 plasmids of 3 E. coli isolates; ΔISEcp1-blaCTX-M-64-orf477-A/C in the chromosome of 1 Salmonella isolate; and ISEcp1-blaCTX-M-64-orf477 on the IncHI2 plasmid and chromosome of 8 Salmonella isolates. CONCLUSIONS To the best of our knowledge, this is the first report of chromosomally encoded CTX-M-64 in Salmonella isolates. ISEcp1-mediated transposition is likely to be responsible for the spread of blaCTX-M-64 between different plasmids and chromosomes in Enterobacteriaceae especially E. coli and Salmonella.
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Affiliation(s)
- Qiu-Yun Zhao
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Pin-Xian Chen
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Ling Yang
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Run-Mao Cai
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Jia-Hang Zhu
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Liang-Xing Fang
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China.,Guangdong Key Laboratory for Veterinary Drug Development and Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Mark A Webber
- Quadram Institute Bioscience, Norwich Research Park, Norwich, Norfolk, NR4 7UA, UK.,Norwich Medical School, University of East Anglia, Norwich Research Park, Norwich, Norfolk, NR4 7TJ, UK
| | - Hong-Xia Jiang
- National Risk Assessment Laboratory for Antimicrobial Resistance of Animal Original Bacteria, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China.,Guangdong Key Laboratory for Veterinary Drug Development and Safety Evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
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Redefining the Origin and Evolution of Chromosomally Encoded blaCTX-M/KLU in the Context of a Revised Taxonomy of Genus Kluyvera. Antimicrob Agents Chemother 2021; 65:e0242420. [PMID: 33903106 DOI: 10.1128/aac.02424-20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Changes in Kluyvera taxonomy may clarify each species contribution for recruitment and dissemination of their relevant β-lactamases. The CTX-M-2 subgroup is linked to Kluyvera ascorbata, KLUC to Kluyvera cryocrescens, and CTX-M-25 to Kluyvera georgiana. The CTX-M-8 subgroup can be linked to Kluyvera genomospecies 3 and CTX-M-9 to Kluyvera genomospecies 2. Kluyvera sichuanensis and Kluyvera genomospecies 1 harbor new subgroups. The CTX-M-1 subgroup has a direct counterpart in an isolate proposed as a new genomospecies 5.
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Chen J, Chen S, Jiang Y, Zhang R, Cai J. Fecal Carriage and Genetic Characterization of CTX-M-1/9/1-Producing Escherichia coli From Healthy Humans in Hangzhou, China. Front Microbiol 2021; 12:616687. [PMID: 33664715 PMCID: PMC7921147 DOI: 10.3389/fmicb.2021.616687] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 01/15/2021] [Indexed: 11/16/2022] Open
Abstract
CTX-M-199, a novel chimeric β-lactamase which mediated resistance to sulbactam and tazobactam, was recently identified in Hangzhou, China. This study investigated the prevalence of fecal carriage of bacteria producing CTX-M-199 and other CTX-M-1/9/1-type enzymes among healthy individuals and characterized the genetic features of blaCTX–M–1/9/1-bearing mobile elements. A total of 74 Enterobacterales strains carrying various blaCTX–M–1/9/1 genes, including blaCTX–M–64 (n = 40, carriage rate of 0.74%), blaCTX–M–199 (n = 23, 0.40%), blaCTX–M–123 (n = 5, 0.10%), novel blaCTX–M–153 (n = 5, 0.10%), and blaCTX–M–132 (n = 2, 0.04%), were isolated from 68 out of 5,000 (1.36%) fecal samples of healthy adults in Hangzhou City. Phylogenetic analysis based on whole-genome sequencing data showed that 72 blaCTX–M–1/9/1-bearing Escherichia coli isolates were clustered into four major clades, three of which included CTX-M-199 producers. Sixty out of 75 blaCTX–M–1/9/1 genes were located on plasmids belonging to four Inc types: IncI2, IncI1, IncFIB, and IncHI2. The blaCTX–M–199 genes were harbored by three of the four types of plasmids except for IncHI2. All these blaCTX–M–1/9/1 genes were carried on an ISEcp1-mediated transposition unit. In conclusion, human fecal carriage of blaCTX–M–1/9/1 was low in healthy populations of China. The ISEcp1 was commonly associated with blaCTX–M–1/9/1 and may mediate its transmission on various mobile elements. Our findings provide insights into the dissemination and the development of further measures for the control of pathogens producing CTX-M-1/9/1-type enzymes.
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Affiliation(s)
- Jiawei Chen
- Clinical Microbiology Laboratory, The Second Affiliated Hospital of Zhejiang University School of Medicine, Zhejiang University, Hangzhou, China
| | - Sheng Chen
- Department of Infectious Diseases and Public Health, Jockey Club College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Kowloon, Hong Kong
| | - Yin Jiang
- Clinical Laboratory, The First People's Hospital of Fuyang Hangzhou, Hangzhou, China
| | - Rong Zhang
- Clinical Microbiology Laboratory, The Second Affiliated Hospital of Zhejiang University School of Medicine, Zhejiang University, Hangzhou, China
| | - Jiachang Cai
- Clinical Microbiology Laboratory, The Second Affiliated Hospital of Zhejiang University School of Medicine, Zhejiang University, Hangzhou, China
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In Vivo Evolution of CTX-M-215, a Novel Narrow-Spectrum β-Lactamase in an Escherichia coli Clinical Isolate Conferring Resistance to Mecillinam. Antimicrob Agents Chemother 2020; 64:AAC.00562-20. [PMID: 32868328 DOI: 10.1128/aac.00562-20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 08/28/2020] [Indexed: 01/25/2023] Open
Abstract
Here, we report a novel narrow-spectrum β-lactamase CTX-M-215 identified in an Escherichia coli clinical isolate in China and conferring high-level resistance to mecillinam but not to cefotaxime. CTX-M-215 differed from CTX-M-125, a CTX-M extended-spectrum β-lactamase (ESBL), by an N132D substitution, which decreased hydrolytic activities toward penicillins and cephalosporins except for mecillinam. High similarity was observed between CTX-M-215- and CTX-M-125-bearing plasmids, carried by different isolates in the same patient, indicating in vivo evolution of CTX-M-215 from CTX-M-125.
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Wang W, Xu J, Fanning S, Zhao L, Li M, Li F. Occurrence of CTX-M-123-producing Salmonella Indiana in chicken carcasses: a new challenge for the poultry industry and food safety. J Antimicrob Chemother 2019; 74:3637-3639. [PMID: 31504565 DOI: 10.1093/jac/dkz386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Wei Wang
- Key Laboratory of Food Safety Risk Assessment, Ministry of Health, China National Center for Food Safety Risk Assessment, Beijing, China
| | - Jin Xu
- Key Laboratory of Food Safety Risk Assessment, Ministry of Health, China National Center for Food Safety Risk Assessment, Beijing, China
| | - Séamus Fanning
- Key Laboratory of Food Safety Risk Assessment, Ministry of Health, China National Center for Food Safety Risk Assessment, Beijing, China.,Centre for Food Safety, School of Public Health, Physiotherapy and Population Science, University College Dublin, Belfield, Dublin, Ireland.,Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Stranmillis Road, Belfast, Northern Ireland
| | - Li Zhao
- School of Public Health, Shandong University, Jinan, China
| | - Menghan Li
- Key Laboratory of Food Safety Risk Assessment, Ministry of Health, China National Center for Food Safety Risk Assessment, Beijing, China
| | - Fengqin Li
- Key Laboratory of Food Safety Risk Assessment, Ministry of Health, China National Center for Food Safety Risk Assessment, Beijing, China
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Patil S, Chen H, Zhang X, Lian M, Ren PG, Wen F. Antimicrobial Resistance and Resistance Determinant Insights into Multi-Drug Resistant Gram-Negative Bacteria Isolates from Paediatric Patients in China. Infect Drug Resist 2019; 12:3625-3634. [PMID: 31819545 PMCID: PMC6878922 DOI: 10.2147/idr.s223736] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 10/17/2019] [Indexed: 12/11/2022] Open
Abstract
Introduction The emergence of multi-drug-resistant Gram-negative bacteria (GNB) is a concern in China and globally. This study investigated antimicrobial resistance traits and resistance determinant detection in GNB isolates from paediatric patients in China. Methods In the present study, a total of 170 isolates of GNB including the most prevalent Escherichia coli, Klebsiella pneumoniae and Acinetobacter baumannii were collected from Shenzhen Children’s Hospital, China. ESBLs production was confirmed by using the combination disc diffusion method, and carbapenemase production was confirmed by using a carbapenem inactivation method followed by antimicrobial susceptibility. In addition, β-lactamase-encoding genes and co-existence of plasmid-borne colistin resistance mcr-1 gene were determined by PCR and sequencing. Results Overall, 170 etiological agents (GNB) were recovered from 158 paediatric patients. The most prevalent species was E. coli 40% (n=68), followed by K. pneumoniae 17.64% (n=30), and Enterobacter cloacae 14.11% (n=24). Of 170 GNB, 71.76% (n=122) were multi-drug-resistant, 12.35% (n=21) extreme-drug resistant, and 7.64% (n=13) single-drug-resistant, while 8.23% (n=14) were sensitive to all of the studied antibiotics. The prevalence of ESBLs and carbapenemase producers were 60% and 17%, respectively. blaCTX-M was the most prevalent resistance gene (59.42%), followed by blaTEM (41.17%), blaSHV (34.270%), blaKPC (34.11%), blaOXA-48 (18.82%) and blaNDM-1 (17.64%). Conclusion The present study provides insights into the linkage between the resistance patterns of GNB to commonly used antibiotics and their uses in China. The findings are useful for understanding the genetics of resistance traits and difficulty in tackling of GNB in paediatric patients.
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Affiliation(s)
- Sandip Patil
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong Province, People's Republic of China.,Shenzhen Children's Hospital, Futian District, Shenzhen, Guangdong Province, People's Republic of China
| | - Hongyu Chen
- Shenzhen Children's Hospital, Futian District, Shenzhen, Guangdong Province, People's Republic of China
| | - Xiaoli Zhang
- Shenzhen Children's Hospital, Futian District, Shenzhen, Guangdong Province, People's Republic of China
| | - Ma Lian
- Shenzhen Children's Hospital, Futian District, Shenzhen, Guangdong Province, People's Republic of China
| | - Pei-Gen Ren
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong Province, People's Republic of China
| | - Feiqiu Wen
- Shenzhen Children's Hospital, Futian District, Shenzhen, Guangdong Province, People's Republic of China
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Patil S, Chen X, Wen F. Exploring the phenotype and genotype of multi-drug resistant Klebsiella pneumoniae harbouring bla CTX-M group extended-spectrum β-lactamases recovered from paediatric clinical cases in Shenzhen, China. Ann Clin Microbiol Antimicrob 2019; 18:32. [PMID: 31690324 PMCID: PMC6829983 DOI: 10.1186/s12941-019-0331-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Accepted: 10/18/2019] [Indexed: 02/07/2023] Open
Abstract
Background Emergence and spread of β-lactamase resistant Klebsiella pneumoniae have posed a serious threat, especially in paediatric patients globally. The present study focuses on explore drug resistance profile and molecular characterization of carbapenemase and extended-spectrum β-lactamase producing K. pneumoniae isolated from paediatric patients in Shenzhen, China. Methods Present study, a total of 31 isolates of multi-drug resistant K. pneumoniae were collected from Shenzhen Children’s Hospital, China during Jan 2014 to December 2015. ESBLs production was confirmed by using the combination disc diffusion method followed by antimicrobial susceptibility. In addition, β-lactamase encoding genes were determined by PCR assay and sequencing. The genotypic diversity and phylogenetic relationship were determined by multi-locus sequence typing (MLST) method and pulsed-field gel electrophoresis (PFGE). Results We examined 31, unique K. pneumoniae isolates collected from 2014 and 2015 in Shenzhen Children’s Hospital, China. All the 31 isolates 100% were resistant to ceftazidime, ertapenem, ampicillin, cefazolin and ampicillin-sulbactam followed by ceftriaxone 94% (n = 29), aztreonam 89% (n = 26), cefepime 84% (n = 26), nitrofurantoin 75% (n = 24), piperacillin 52% (n = 16), and levofloxacin 49% (n = 15). Of the 31 β-lactamase gene coding isolates, blaCTX-M was mainly detected in about 100% (n = 31), followed by blaKPC 71% (n = 22), blaSHV 61% (n = 19), blaNDM 25% (n = 8), blaCYM 13% (n = 4), blaOXA-48 9% (n = 3), blaGES 9% (n = 3) and blaTEM 6% (n = 2). Seventeen distinct sequences type were observed with ST20 being mostly identified 16% (n = 5). Pulsed-field gel electrophoresis (PFGE) typing showed that identical profile for the isolates recovered from the Department of Intensive Care Unit and Department of Neurology of our hospital. Plasmid replicon typing result indicates the presence of IncFIS type as highest in all isolates as 61% (n = 19), followed by IncFIB 23% (n = 7), IncFIA and IncFIC 16% (n = 5) each. Conclusion Our study reports the occurrence and spread of extended β-lactamase K. pneumoniae ST20 and ST2407 for the first time, in Shenzhen, particularly in paediatric patients. To prevent and control the infection by limiting the spread of infection-causing organisms it is very crucial to detect the presence of resistant genes at an early stage.
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Affiliation(s)
- Sandip Patil
- Department of Haematology and Oncology, Shenzhen Children's Hospital, 7019 Yitian Road, District Futian, Shenzhen, 518038, Guangdong Province, China.,Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, Guangdong Province, China.,Paediatric Research Institute, Shenzhen Children's Hospital, 7019 Yitian Road, District Futian, Shenzhen, 518038, Guangdong Province, China
| | - Xiaowen Chen
- Paediatric Research Institute, Shenzhen Children's Hospital, 7019 Yitian Road, District Futian, Shenzhen, 518038, Guangdong Province, China
| | - Feiqiu Wen
- Department of Haematology and Oncology, Shenzhen Children's Hospital, 7019 Yitian Road, District Futian, Shenzhen, 518038, Guangdong Province, China. .,Paediatric Research Institute, Shenzhen Children's Hospital, 7019 Yitian Road, District Futian, Shenzhen, 518038, Guangdong Province, China.
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Patil S, Chen X, Lian M, Wen F. Phenotypic and genotypic characterization of multi-drug-resistant Escherichia coli isolates harboring bla CTX-M group extended-spectrum β-lactamases recovered from pediatric patients in Shenzhen, southern China. Infect Drug Resist 2019; 12:1325-1332. [PMID: 31190921 PMCID: PMC6529603 DOI: 10.2147/idr.s199861] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Accepted: 04/10/2019] [Indexed: 01/05/2023] Open
Abstract
Aims and Objectives: The emergence and spread of extended-spectrum β-lactamases (ESBLs) particularly CTX-M producing multi-drug-resistant (MDR) Escherichia coli (E. coli) is one of the greatest challenges for community health globally. The study investigated the phenotypic and genotypic characteristics of ESBLs-producing E. coli recovered from pediatric patients from Shenzhen Children’s Hospital, China. Materials and methods: Present study, a total of 2,670 isolates of E. coli were collected from Shenzhen Children’s Hospital, China of which 950 were ESBLs producer. ESBLs production was confirmed by using the combination disc diffusion method, and antimicrobial susceptibility test was detected. In addition, β-lactamase-producing genes and co-existence of carbapenem/colistin resistance genes were determined by PCR assay and sequencing. The diversity and phylogenetic relationship were determined by multi-locus sequence typing method. Results: Thirty-five percent (n=950) prevalence of ESBLs-producing E. coli we reported in Shenzhen, China of which 50 ESBLs producing E. coli were randomly selected for a further characterization. All 50 ESBLs- producing E. coli isolates revealed MDR phenotype and 100% were resistant to Ampicillin/sulbactam, Ampicillin, Cefazolin, and Ceftriaxone. All 50 ESBLs producers harbored at least one type of β-lactamase gene particular blaCTX-M. The PCR and sequencing revealed the most common CTX-M subtype was blaCTX-M-15 (n=18), followed by blaCTX-M-14 (n=16), blaCTX-M-90 (n=9), blaCTX-M-55 (n=3), blaCTX-M-27, blaCTX-M-101, and blaCTX-M-211 each (n=1). Co-existence of blaCTX-M with blaTEM, blaSHV, blaGES, and blaVEB was detected in few isolates. Among identified sequence types, ST131 (12%) was more dominant in ESBLs-producing E. coli. Phylogenetic group A was the most prominent group among the ESBLs-producing E. coli based on multiplex PCR. Conclusion: Our study shows the prevalence of blaCTX-M gene in ESBLs-producing E. coli in pediatric patients in Shenzhen, China. We highlight the importance to monitor the emergence and trends of ESBLs-producing isolates in a pediatric healthcare setting.
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Affiliation(s)
- Sandip Patil
- Department of Haematology and Oncology, Shenzhen Children's Hospital, Shenzhen, Guangdong Province 518038, People's Republic of China.,Paediatric Research Institute, Shenzhen Children's Hospital, Shenzhen, Guangdong Province 518038, People's Republic of China
| | - Xiaowen Chen
- Department of Haematology and Oncology, Shenzhen Children's Hospital, Shenzhen, Guangdong Province 518038, People's Republic of China.,Paediatric Research Institute, Shenzhen Children's Hospital, Shenzhen, Guangdong Province 518038, People's Republic of China
| | - Ma Lian
- Paediatric Research Institute, Shenzhen Children's Hospital, Shenzhen, Guangdong Province 518038, People's Republic of China
| | - Feiqiu Wen
- Department of Haematology and Oncology, Shenzhen Children's Hospital, Shenzhen, Guangdong Province 518038, People's Republic of China.,Paediatric Research Institute, Shenzhen Children's Hospital, Shenzhen, Guangdong Province 518038, People's Republic of China
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Jeon HY, Seo KW, Kim YB, Kim DK, Kim SW, Lee YJ. Characteristics of third-generation cephalosporin-resistant Salmonella from retail chicken meat produced by integrated broiler operations. Poult Sci 2019; 98:1766-1774. [PMID: 30535173 DOI: 10.3382/ps/pey514] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 10/15/2018] [Indexed: 02/05/2023] Open
Abstract
Integrated broiler operations, which control and operate vertically through all phases of the chicken industry, have applied biosecurity and sanitation practices, housing technologies, feeding regimens, and antibiotic applications in different ways to improve food safety. The objective of this study was to compare the prevalence and antimicrobial resistance profiles of Salmonella isolates recovered from 6 different integrated broiler operations and to analyze the characteristics of extended-spectrum β-lactamase (ESBL)- and plasmid-mediated AmpC β-lactamase (pAmpC)-producing Salmonella isolates. Among 336 chicken meat samples, 57 were observed to be positive for Salmonella. However, the prevalence varied from 6.8% to 45.8% in chicken meat, indicating variations in Salmonella occurrence among the operations. Salmonella Albany was the dominant serovar, followed by Salmonella Virchow. In the antimicrobial resistance test, nalidixic acid-resistant isolates were the most prevalent (73.7%), followed by isolates resistant to ampicillin (49.1%) and tetracycline (42.1%). Among 14 third-generation cephalosporin-resistant isolates, 9 (64.3%) ESBL/pAmpC-producing isolates were only obtained from 2 operations: blaCTX-M-15 (n = 7) and blaCTX-M-79 (n = 1) for ESBL genes and blaCMY-2 (n = 1) for pAmpC. All ESBL/pAmpC-positive isolates exhibited high minimum inhibitory concentrations (≥128 μg/mL) of most cephalosporins and showed multidrug resistance. The transfer of ESBL/pAmpC genes was confirmed in transconjugants, which had the same genes and similar resistance patterns as those of the donor. Our findings suggest that Salmonella with resistance to third-generation cephalosporins can now be found in association with integrated broiler operations, providing data to support the development of monitoring and prevention programs for the development and spread of antimicrobial resistance in integrated broiler operations.
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Affiliation(s)
- Hye Young Jeon
- Department of Public Health, College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Kwang Won Seo
- Department of Public Health, College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Yeong Bin Kim
- Department of Public Health, College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Dong Kyu Kim
- Department of Public Health, College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Shin Woo Kim
- Department of Public Health, College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Young Ju Lee
- Department of Public Health, College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea
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Jeon HY, Kim YB, Lim SK, Lee YJ, Seo KW. Characteristics of cephalosporin-resistant Salmonella isolates from poultry in Korea, 2010–2017. Poult Sci 2019; 98:957-965. [DOI: 10.3382/ps/pey418] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Accepted: 08/16/2018] [Indexed: 12/26/2022] Open
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CTX-M Genotyping among Cystitis Associated Cefotaxime-Resistant Uropathogenic Escherichia coli (CRUPEC). JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2018. [DOI: 10.22207/jpam.12.3.56] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Zhong LL, Stoesser N, Doi Y, Shen C, Huang X, Tian GB. Carriage of β-lactamase-producing Enterobacteriaceae by Chinese travellers. THE LANCET. INFECTIOUS DISEASES 2018; 17:138-139. [PMID: 28134109 DOI: 10.1016/s1473-3099(17)30002-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 12/07/2016] [Accepted: 12/08/2016] [Indexed: 11/16/2022]
Affiliation(s)
- Lan-Lan Zhong
- Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China; Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Nicole Stoesser
- Modernizing Medical Microbiology Consortium, Nuffield Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom
| | - Yohei Doi
- Division of Infectious Diseases, University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Cong Shen
- Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China; Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Xi Huang
- Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China; Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Guo-Bao Tian
- Department of Immunology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China; Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China.
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15
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Po KHL, Chan EWC, Chen S. Characterization of Protein Domain Function via in vitro DNA Shuffling. Bio Protoc 2018; 8:e2873. [PMID: 34285987 DOI: 10.21769/bioprotoc.2873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 05/13/2018] [Accepted: 05/16/2018] [Indexed: 11/02/2022] Open
Abstract
We recently investigated the molecular events that drive evolution of the CTX-M-type β-lactamases by DNA shuffling of fragments of the bla CTX-M-14 and bla CTX-M-15 genes. Analysis of a total of 51 hybrid enzymes showed that enzymatic activity could be maintained in most cases, yet the enzymatically active hybrids were found to possess much fewer amino acid substitutions than the few hybrids that became inactive, suggesting that point mutations in the constructs rather than reshuffling of the fragments of the two target genes would more likely cause disruption of CTX-M activity. Certain important residues that played important functional roles in mediating enzyme activity were identified. These findings suggest that DNA shuffling is an effective approach to identify and characterize important functional domains in bacterial proteins.
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Affiliation(s)
- Kathy Hiu Laam Po
- Shenzhen Key Lab for Food Biological Safety Control, Food Safety and Technology Research Center, Hong Kong PolyU Shen Zhen Research Institute, Shenzhen, P. R. China.,State Key Lab of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Edward Wai Chi Chan
- Shenzhen Key Lab for Food Biological Safety Control, Food Safety and Technology Research Center, Hong Kong PolyU Shen Zhen Research Institute, Shenzhen, P. R. China.,State Key Lab of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Sheng Chen
- Shenzhen Key Lab for Food Biological Safety Control, Food Safety and Technology Research Center, Hong Kong PolyU Shen Zhen Research Institute, Shenzhen, P. R. China.,State Key Lab of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
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16
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Functional Characterization of CTX-M-14 and CTX-M-15 β-Lactamases by In Vitro DNA Shuffling. Antimicrob Agents Chemother 2017; 61:AAC.00891-17. [PMID: 28971870 DOI: 10.1128/aac.00891-17] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 09/25/2017] [Indexed: 01/25/2023] Open
Abstract
This work investigated the molecular events driving the evolution of the CTX-M-type β-lactamases by the use of DNA shuffling of fragments of the blaCTX-M-14 and blaCTX-M-15 genes. Analysis of a total of 51 hybrid enzymes showed that enzymatic activity could be maintained in most cases, yet hybrids that were active possessed fewer amino acid substitutions than those that were inactive, suggesting that point mutations in the constructs rather than reshuffling of the fragments of the two target genes would more likely cause disruption of CTX-M activity. For example, the P67L and L261P changes in a CTX-M-14 fragment could completely abolish the activity of the enzyme on all antibiotics tested. Structural analysis showed that L216 was located in the active-site β sheet and might interact with the adjacent hydrophobic residues to stabilize the active-site β sheet and maintain the integrity of the enzyme active site. Likewise, a single amino acid substitution, E64K, was found to exhibit a significant suppressive effect on CTX-M-15 activity. Structural analysis showed that E64 might form a salt bridge with R44, disruption of which might affect CTX-M-15 activity. Further analysis of the structure-function relationship of a range of mutant enzymes confirmed that, as can be expected, unstable enzymes lose their activity and avoid selective events. These findings suggest that the distal pockets could also contribute to the activity of the enzymes and may be regarded as alternative targets for inhibitor development.
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17
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Yang X, Zou W, Zeng J, Xie S, An T, Luo X, Chen D, Feng L, Cheng G, Cai R, Huang Q, Wang H. Prevalence of antimicrobial resistance and integron gene cassettes in Escherichia coli isolated from yaks (Poephagus grunniens) in Aba Tibetan Autonomous Prefecture, China. Microb Pathog 2017; 111:274-279. [DOI: 10.1016/j.micpath.2017.09.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 09/05/2017] [Accepted: 09/05/2017] [Indexed: 01/09/2023]
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18
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CTX-M-190, a Novel β-Lactamase Resistant to Tazobactam and Sulbactam, Identified in an Escherichia coli Clinical Isolate. Antimicrob Agents Chemother 2016; 61:AAC.01848-16. [PMID: 27821452 DOI: 10.1128/aac.01848-16] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 11/02/2016] [Indexed: 01/25/2023] Open
Abstract
A novel β-lactamase, CTX-M-190, derived from CTX-M-55 by a single substitution of Ser for Thr at position 133 (Ser133Thr), was identified in a natural Escherichia coli clinical isolate. CTX-M-190 exhibited potent hydrolytic activity against cefotaxime, with a kcat/Km ratio of 14.5 μM-1 s-1, and was highly resistant to inhibition by the β-lactamase inhibitors tazobactam and sulbactam, whose 50% inhibitory concentrations were 77- and 55-fold higher, respectively, for CTX-M-190 than for CTX-M-55. blaCTX-M-190 was located within the genetic platform ISEcp1-blaCTX-M-orf477, which was harbored by a 70-kb IncI1 plasmid.
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19
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Coproduction of MCR-1 and NDM-1 by Colistin-Resistant Escherichia coli Isolated from a Healthy Individual. Antimicrob Agents Chemother 2016; 61:AAC.01962-16. [PMID: 27821458 DOI: 10.1128/aac.01962-16] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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20
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Ni Q, Tian Y, Zhang L, Jiang C, Dong D, Li Z, Mao E, Peng Y. Prevalence and quinolone resistance of fecal carriage of extended-spectrum β-lactamase-producing Escherichia coli in 6 communities and 2 physical examination center populations in Shanghai, China. Diagn Microbiol Infect Dis 2016; 86:428-433. [PMID: 27681363 DOI: 10.1016/j.diagmicrobio.2016.07.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Revised: 07/04/2016] [Accepted: 07/09/2016] [Indexed: 10/21/2022]
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21
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Martínez JL, Coque TM, Lanza VF, de la Cruz F, Baquero F. Genomic and metagenomic technologies to explore the antibiotic resistance mobilome. Ann N Y Acad Sci 2016; 1388:26-41. [PMID: 27861983 DOI: 10.1111/nyas.13282] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 09/20/2016] [Accepted: 09/26/2016] [Indexed: 12/13/2022]
Abstract
Antibiotic resistance is a relevant problem for human health that requires global approaches to establish a deep understanding of the processes of acquisition, stabilization, and spread of resistance among human bacterial pathogens. Since natural (nonclinical) ecosystems are reservoirs of resistance genes, a health-integrated study of the epidemiology of antibiotic resistance requires the exploration of such ecosystems with the aim of determining the role they may play in the selection, evolution, and spread of antibiotic resistance genes, involving the so-called resistance mobilome. High-throughput sequencing techniques allow an unprecedented opportunity to describe the genetic composition of a given microbiome without the need to subculture the organisms present inside. However, bioinformatic methods for analyzing this bulk of data, mainly with respect to binning each resistance gene with the organism hosting it, are still in their infancy. Here, we discuss how current genomic methodologies can serve to analyze the resistance mobilome and its linkage with different bacterial genomes and metagenomes. In addition, we describe the drawbacks of current methodologies for analyzing the resistance mobilome, mainly in cases of complex microbiotas, and discuss the possibility of implementing novel tools to improve our current metagenomic toolbox.
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Affiliation(s)
- José L Martínez
- Centro Nacional de Biotecnología, CSIC, Darwin 3, Madrid, Spain
| | - Teresa M Coque
- Servicio de Microbiología, Hospital Universitario Ramón y Cajal (IRYCIS), Madrid, Spain.,CIBER en Epidemiología y Salud Pública (CIBER-ESP), Madrid, Spain.,Unidad de Resistencia a Antibióticos y Virulencia Bacteriana (RYC-CSIC), Madrid, Spain
| | - Val F Lanza
- Servicio de Microbiología, Hospital Universitario Ramón y Cajal (IRYCIS), Madrid, Spain.,CIBER en Epidemiología y Salud Pública (CIBER-ESP), Madrid, Spain.,Unidad de Resistencia a Antibióticos y Virulencia Bacteriana (RYC-CSIC), Madrid, Spain
| | - Fernando de la Cruz
- Instituto de Biomedicina y Biotecnología de Cantabria, Universidad de Cantabria-Consejo Superior de Investigaciones Científicas, Santander, Cantabria, Spain
| | - Fernando Baquero
- Servicio de Microbiología, Hospital Universitario Ramón y Cajal (IRYCIS), Madrid, Spain.,CIBER en Epidemiología y Salud Pública (CIBER-ESP), Madrid, Spain.,Unidad de Resistencia a Antibióticos y Virulencia Bacteriana (RYC-CSIC), Madrid, Spain
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22
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Comparative Characterization of CTX-M-64 and CTX-M-14 Provides Insights into the Structure and Catalytic Activity of the CTX-M Class of Enzymes. Antimicrob Agents Chemother 2016; 60:6084-90. [PMID: 27480856 DOI: 10.1128/aac.00917-16] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 07/21/2016] [Indexed: 11/20/2022] Open
Abstract
Clinical isolates producing hybrid CTX-M β-lactamases, presumably due to recombination between the blaCTX-M-15 and blaCTX-M-14 elements, have emerged in recent years. Among the hybrid enzymes, CTX-M-64 and CTX-M-14 display the most significant difference in catalytic activity. This study aims to investigate the mechanisms underlying such differential enzymatic activities in order to provide insight into the structure/function relationship of this class of enzymes. Sequence alignment analysis showed that the major differences between the amino acid composition of CTX-M-64 and CTX-M-14 lie at both the N and C termini of the enzymes. Single or multiple amino acid substitutions introduced into CTX-M-64 and CTX-M-14 were found to produce only minor effects on hydrolytic functions; such a finding is consistent with the notion that the discrepancy between the functional activities of the two enzymes is not the result of only a few amino acid changes but is attributable to interactions between a unique set of amino acid residues in each enzyme. This theory is supported by the results of the thermal stability assay, which confirmed that CTX-M-64 is significantly more stable than CTX-M-14. Our data confirmed that, in addition to the important residues located in the active site, residues distal to the active site also contribute to the catalytic activity of the enzyme through stabilizing its structural integrity.
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23
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Characterization of CTX-M-140, a Variant of CTX-M-14 Extended-Spectrum β-Lactamase with Decreased Cephalosporin Hydrolytic Activity, from Cephalosporin-Resistant Proteus mirabilis. Antimicrob Agents Chemother 2016; 60:6121-6. [PMID: 27480855 DOI: 10.1128/aac.00822-16] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 07/23/2016] [Indexed: 01/26/2023] Open
Abstract
CTX-M-140, a novel CTX-M-type extended-spectrum β-lactamase (ESBL), was identified in cephalosporin-resistant clinical isolates of Proteus mirabilis CTX-M-140 contained an alanine-to-threonine substitution at position 109 compared to its putative progenitor, CTX-M-14. When it was expressed in an Escherichia coli isogenic background, CTX-M-140 conferred 4- to 32-fold lower MICs of cephalosporins than those with CTX-M-14, indicating that the phenotype was attributable to this single substitution. For four mutants of CTX-M-14 that were constructed by site-directed mutagenesis (A109E, A109D, A109K, and A109R mutants), MICs of cephalosporins were similar to those for the E. coli host strain, which suggested that the alanine at position 109 was essential for cephalosporin hydrolysis. The kinetic properties of native CTX-M-14 and CTX-M-140 were consistent with the MICs for the E. coli clones. Compared with that of CTX-M-14, a lower hydrolytic activity against cephalosporins was observed for CTX-M-140. blaCTX-M-140 is located on the chromosome as determined by I-CeuI pulsed-field gel electrophoresis (I-CeuI-PFGE) and Southern hybridization. The genetic environment surrounding blaCTX-M-140 is identical to the sequence found in different plasmids with blaCTX-M-9-group genes among the Enterobacteriaceae Genome sequencing and analysis showed that P. mirabilis strains with blaCTX-M-140 have a genome size of ∼4 Mbp, with a GC content of 38.7% and 23 putative antibiotic resistance genes. Our results indicate that alanine at position 109 is critical for the hydrolytic activity of CTX-M-14 against oxyimino-cephalosporins.
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24
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Zhang XF, Doi Y, Huang X, Li HY, Zhong LL, Zeng KJ, Zhang YF, Patil S, Tian GB. Possible Transmission of mcr-1-Harboring Escherichia coli between Companion Animals and Human. Emerg Infect Dis 2016; 22:1679-81. [PMID: 27191649 PMCID: PMC4994340 DOI: 10.3201/eid2209.160464] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
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25
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Emergence of the Plasmid-Mediated mcr-1 Gene in Colistin-Resistant Enterobacter aerogenes and Enterobacter cloacae. Antimicrob Agents Chemother 2016; 60:3862-3. [PMID: 26976876 DOI: 10.1128/aac.00345-16] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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26
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Zhang WH, Ren SQ, Gu XX, Li W, Yang L, Zeng ZL, Liu YH, Jiang HX. High frequency of virulence genes among Escherichia coli with the bla CTX-M genotype from diarrheic piglets in China. Vet Microbiol 2015; 180:260-7. [DOI: 10.1016/j.vetmic.2015.08.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 08/12/2015] [Accepted: 08/26/2015] [Indexed: 02/06/2023]
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27
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Liao XP, Xia J, Yang L, Li L, Sun J, Liu YH, Jiang HX. Characterization of CTX-M-14-producing Escherichia coli from food-producing animals. Front Microbiol 2015; 6:1136. [PMID: 26528278 PMCID: PMC4606122 DOI: 10.3389/fmicb.2015.01136] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 10/02/2015] [Indexed: 11/13/2022] Open
Abstract
Bacterial resistance to the third-generation cephalosporin antibiotics has become a major concern for public health. This study was aimed to determine the characteristics and distribution of bla CTX-M-14, which encodes an extended-spectrum β-lactamase, in Escherichia coli isolated from Guangdong Province, China. A total of 979 E. coli isolates isolated from healthy or diseased food-producing animals including swine and avian were examined for bla CTX-M-14 and then the bla CTX-M-14 -positive isolates were detected by other resistance determinants [extended-spectrum β-lactamase genes, plasmid-mediated quinolone resistance, rmtB, and floR] and analyzed by phylogenetic grouping analysis, PCR-based plasmid replicon typing, multilocus sequence typing, and plasmid analysis. The genetic environments of bla CTX-M-14 were also determined by PCR. The results showed that fourteen CTX-M-14-producing E. coli were identified, belonging to groups A (7/14), B1 (4/14), and D (3/14). The most predominant resistance gene was bla TEM (n = 8), followed by floR (n = 7), oqxA (n = 3), aac(6')-1b-cr (n = 2), and rmtB (n = 1). Plasmids carrying bla CTX-M-14 were classified to IncK, IncHI2, IncHI1, IncN, IncFIB, IncF or IncI1, ranged from about 30 to 200 kb, and with insertion sequence of ISEcp1, IS26, or ORF513 located upstream and IS903 downstream of bla CTX-M-14. The result of multilocus sequence typing showed that 14 isolates had 11 STs, and the 11 STs belonged to five groups. Many of the identified sequence types are reported to be common in E. coli isolates associated with extraintestinal infections in humans, suggesting possible transmission of bla CTX-M-14 between animals and humans. The difference in the flanking sequences of bla CTX-M-14 between the 2009 isolates and the early ones suggests that the resistance gene context continues to evolve in E. coli of food producing animals.
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Affiliation(s)
- Xiao-Ping Liao
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University Guangzhou, China
| | - Jing Xia
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University Guangzhou, China
| | - Lei Yang
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University Guangzhou, China
| | - Liang Li
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University Guangzhou, China
| | - Jian Sun
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University Guangzhou, China
| | - Ya-Hong Liu
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University Guangzhou, China ; Jiangsu Co-Innovation Centre for Prevention and Control of Important Animal Infectious Diseases and Zoonoses Yangzhou, China
| | - Hong-Xia Jiang
- Laboratory of Veterinary Pharmacology, College of Veterinary Medicine, South China Agricultural University Guangzhou, China
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28
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Genetic Contexts of blaNDM-1 in Patients Carrying Multiple NDM-Producing Strains. Antimicrob Agents Chemother 2015; 59:7405-10. [PMID: 26392493 DOI: 10.1128/aac.01319-15] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 09/04/2015] [Indexed: 11/20/2022] Open
Abstract
The carbapenem resistance determinant blaNDM-1 has been found in various Gram-negative bacteria and upon different plasmid replicon types (Inc). Here, we present four patients within two hospitals in Pakistan harboring between two and four NDM-1-producing Gram-negative bacilli of different species coresident in their stool samples. We characterize the blaNDM-1 genetic contexts of these 11 NDM-1-producing Gram-negative bacilli in addition to other antimicrobial resistance mechanisms, plasmid replicon profiles, and sequence types (STs) in order to understand the underlying acquisition mechanisms of carbapenem resistance within these bacteria. Two common plasmid types (IncN2 and IncA/C) were identified to carry blaNDM-1 among the six different bacterial species isolated from the four patients. Two of these strains were novel Citrobacter freundii ST 20 and ST 21. The same IncN2-type blaNDM-1 genetic context was found in all four patients and within four different species. The IncA/C-type blaNDM-1 genetic context was found in two different species and in two of the four patients. Combining genetic context characterization with other molecular epidemiology methods, we were able to establish the molecular epidemiological links between genetically unrelated bacterial species by linking their acquisition of an IncN2 or IncA/C plasmid carrying blaNDM-1 for carbapenem resistance. By combining plasmid characterization and in-depth genetic context assessment, this analysis highlights the importance of plasmids in antimicrobial resistance. It also provides a novel approach for investigating the underlying mechanisms of blaNDM-1-related spread between bacterial species and genera via plasmids.
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29
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Huang YM, Zhong LL, Zhang XF, Hu HT, Li YQ, Yang XR, Feng LQ, Huang X, Tian GB. NDM-1-Producing Citrobacter freundii, Escherichia coli, and Acinetobacter baumannii Identified from a Single Patient in China. Antimicrob Agents Chemother 2015; 59:5073-7. [PMID: 26055374 PMCID: PMC4505197 DOI: 10.1128/aac.04682-14] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2014] [Accepted: 05/31/2015] [Indexed: 12/15/2022] Open
Abstract
We identified New Delhi metallo-β-lactamase (NDM-1)-producing Citrobacter freundii GB032, Escherichia coli GB102, and Acinetobacter baumannii GB661 in urine and stool samples from a single patient in China. Plasmid profiling and Southern blotting indicated that blaNDM-1 from GB032 and that from GB102 were likely located on the same plasmid, while blaNDM-1 from GB661 was located on a very large (>400-kb) plasmid. This case underscores the broad host range of blaNDM-1 and its potential to spread between members of the family Enterobacteriaceae and A. baumannii.
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Affiliation(s)
- Ying-Min Huang
- Department of Immunology, Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China Department of Laboratory, Central Hospital of Panyu District, Shiqiao, Guangzhou, Guangdong, China
| | - Lan-Lan Zhong
- Department of Immunology, Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Xue-Fei Zhang
- Department of Immunology, Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
| | - Hang-Tong Hu
- Department of Immunology, Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Yu-Qi Li
- Department of Immunology, Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Xiao-Rong Yang
- Clinical Laboratory of the First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou, China
| | - Lian-Qiang Feng
- Department of Immunology, Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Xi Huang
- Department of Immunology, Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China
| | - Guo-Bao Tian
- Department of Immunology, Institute of Human Virology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China Key Laboratory of Tropical Diseases Control (Sun Yat-sen University), Ministry of Education, Guangzhou, China
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30
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Residues Distal to the Active Site Contribute to Enhanced Catalytic Activity of Variant and Hybrid β-Lactamases Derived from CTX-M-14 and CTX-M-15. Antimicrob Agents Chemother 2015; 59:5976-83. [PMID: 26169409 DOI: 10.1128/aac.04920-14] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 07/06/2015] [Indexed: 11/20/2022] Open
Abstract
A variety of CTX-M-type extended-spectrum β-lactamases (ESBLs), including hybrid ones, have been reported in China that are uncommon elsewhere. To better characterize the substrate profiles and enzymatic mechanisms of these enzymes, we performed comparative kinetic analyses of both parental and hybrid CTX-M enzymes, including CTX-M-15, -132, -123, -64, -14 and -55, that are known to confer variable levels of β-lactam resistance in the host strains. All tested enzymes were susceptible to serine β-lactamase inhibitors, with sulbactam exhibiting the weakest inhibitory effects. CTX-M-55, which differs from CTX-M-15 by one substitution, A(77)V, displayed enhanced catalytic activity (kcat/Km) against expanded-spectrum cephalosporins (ESCs). CTX-M-55 exhibits higher structure stability, most likely by forming hydrophobic interactions between A(77)V and various key residues in different helices, thereby stabilizing the core architecture of the helix cluster, and indirectly contributes to a more stable active site conformation, which in turn shows higher catalytic efficiency and is more tolerant to temperature change. Analyses of the hybrids and their parental prototypes showed that evolution from CTX-M-15 to CTX-M-132, CTX-M-123, and CTX-M-64, characterized by gradual enhancement of catalytic activity to ESCs, was attributed to introduction of different substitutions to amino acids distal to the active site of CTX-M-15. Similarly, the increased hydrolytic activities against cephalosporins and sensitivity to β-lactamase inhibitors, clavulanic acid and sulbactam, of CTX-M-64 were partly due to the amino acids that were different from CTX-M-14 and located at both the C and N termini of CTX-M-64. These data indicate that residues distal to the active site of CTX-Ms contributed to their enhanced catalytic activities to ESCs.
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31
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blaCTX-M-1/9/1 Hybrid Genes May Have Been Generated from blaCTX-M-15 on an IncI2 Plasmid. Antimicrob Agents Chemother 2015; 59:4464-70. [PMID: 25987615 DOI: 10.1128/aac.00501-15] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 05/08/2015] [Indexed: 11/20/2022] Open
Abstract
Three hybrid CTX-M β-lactamases, CTX-M-64, CTX-M-123, and CTX-M-132, with N and C termini matching CTX-M-1 group enzymes and centers matching CTX-M-9 group enzymes, have been identified. The hybrid gene sequences suggested recombination between blaCTX-M-15 and blaCTX-M-14, the two most common blaCTX-M variants worldwide. However, blaCTX-M-64 and blaCTX-M-123 are found in an ISEcp1-blaCTX-M transposition unit with a 45-bp "spacer," rather than the 48 bp usually associated with blaCTX-M-15, and 112 bp of IncA/C plasmid backbone. This is closer to the context of blaCTX-M-55, which has one nucleotide difference from blaCTX-M-15, on IncI2 plasmid pHN1122-1. Here, we characterized an IncI2 plasmid carrying blaCTX-M-15 with a 45-bp spacer (pHNY2-1) by complete sequencing and also sequenced IncI2 plasmids carrying blaCTX-M-64 (pHNAH46-1) or blaCTX-M-132 (pHNLDH19) and an IncI1 plasmid carrying blaCTX-M-123 (pHNAH4-1). pHNY2-1 has the same ISEcp1-blaCTX-M-IncA/C insertion as pHN1122-1, pHNAH46-1, and pHNLDH19, and all four plasmid backbones are almost identical. pHNAH4-1 (IncI1 sequence type 108 [ST108]) carries a transposition unit that includes a 2,720-bp fragment of the IncI2 backbone, suggesting ISEcp1-mediated transfer of blaCTX-M-IncA/C-IncI2 to an IncI1 plasmid. All three hybrid blaCTX-M genes may have resulted from recombination between blaCTX-M-14 and blaCTX-M-15 with a 45-bp spacer on an IncI2 plasmid. Five additional Escherichia coli isolates of different sequence types from different provinces, farms, and/or animals had blaCTX-M-64 on a pHNAH46-1-like IncI2 plasmid and 9 had blaCTX-M-123 on a pHNAH4-1-like IncI1 ST108 plasmid. Thus, epidemic IncI plasmids may be responsible for the spread of blaCTX-M-64 and blaCTX-M-123 between different animals and different locations in China.
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Ho PL, Liu MCJ, Lo WU, Lai ELY, Lau TCK, Law OK, Chow KH. Prevalence and characterization of hybrid blaCTX-M among Escherichia coli isolates from livestock and other animals. Diagn Microbiol Infect Dis 2015; 82:148-53. [PMID: 25861872 DOI: 10.1016/j.diagmicrobio.2015.02.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 02/11/2015] [Accepted: 02/17/2015] [Indexed: 11/25/2022]
Abstract
This study investigated 248 extended-spectrum β-lactamase-producing Escherichia coli isolates from 2012 to 2013 for hybrid blaCTX-M genes. blaCTX-M genes were detected in 228 isolates of which 14 isolates were hybrid blaCTX-M positive (6 blaCTX-M-123, 6 blaCTX-M-64, and 2 blaCTX-M-132). The 14 hybrid blaCTX-M-carrying isolates (8 from chickens, 2 each from pigs and cattle, 1 each from dog and rodent) were genetically diverse. All but 2 hybrid blaCTX-M were carried on IncI1 (5 blaCTX-M-123) and IncI2 (6 blaCTX-M-64 and one blaCTX-M-132) plasmids. Our IncI1 and IncI2 plasmids had pHNAH4-1-like and pHN1122-1-like restriction fragment length polymorphism patterns, respectively. Genetic relatedness of the plasmids to pHNAH4-1 and pHN1122-1 were confirmed by complete sequencing of 3 plasmids, pCTXM123_C0996, pCTXM64_C0967, and pCTXM132_P0421. Plasmids closely related to pHNAH4-1 and pHN1122-1 and carrying different blaCTX-M alleles have been reported from multiple geographic areas in China previously. The findings highlighted the wide dissemination of hybrid blaCTX-M variants in different parts of China.
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Affiliation(s)
- Pak-Leung Ho
- Carol Yu Centre for Infection and Department of Microbiology, Queen Mary Hospital, University of Hong Kong, Hong Kong Special Administrative Region, People's Republic of China.
| | - Melissa Chun-Jiao Liu
- Carol Yu Centre for Infection and Department of Microbiology, Queen Mary Hospital, University of Hong Kong, Hong Kong Special Administrative Region, People's Republic of China
| | - Wai-U Lo
- Carol Yu Centre for Infection and Department of Microbiology, Queen Mary Hospital, University of Hong Kong, Hong Kong Special Administrative Region, People's Republic of China
| | - Eileen Ling-Yi Lai
- Carol Yu Centre for Infection and Department of Microbiology, Queen Mary Hospital, University of Hong Kong, Hong Kong Special Administrative Region, People's Republic of China
| | - Terrence Chi-Kong Lau
- Department of Biomedical Sciences, College of Science and Engineering, City University of Hong Kong, Hong Kong Special Administrative Region, People's Republic of China
| | - Oi-Kwan Law
- Department of Biomedical Sciences, College of Science and Engineering, City University of Hong Kong, Hong Kong Special Administrative Region, People's Republic of China
| | - Kin-Hung Chow
- Carol Yu Centre for Infection and Department of Microbiology, Queen Mary Hospital, University of Hong Kong, Hong Kong Special Administrative Region, People's Republic of China
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Detection of CTX-M-64 in Escherichia coli isolates from human patients in China. Antimicrob Agents Chemother 2014; 59:1371-2. [PMID: 25421481 DOI: 10.1128/aac.04158-14] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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