1
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Pagan E, Merino N, Berdejo D, Campillo R, Gayan E, García-Gonzalo D, Pagan R. Adaptive evolution of Salmonella Typhimurium LT2 exposed to carvacrol lacks a uniform pattern. Appl Microbiol Biotechnol 2024; 108:38. [PMID: 38175235 PMCID: PMC10766787 DOI: 10.1007/s00253-023-12840-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Revised: 10/05/2023] [Accepted: 10/17/2023] [Indexed: 01/05/2024]
Abstract
Emergence of genetic variants with increased resistance/tolerance to natural antimicrobials, such as essential oils, has been previously evidenced; however, it is unknown whether mutagenesis follows a general or a specific pattern. For this purpose, we carried out four adaptive laboratory evolutions (ALE) in parallel of Salmonella enterica Typhimurium with carvacrol. After 10 evolution steps, we selected and characterized one colony from each lineage (SeCarA, SeCarB, SeCarC, and SeCarD). Phenotypic characterization of the four evolved strains revealed enhanced survival to lethal treatments; two of them (SeCarA and SeCarB) showed an increase of minimum inhibitory concentration of carvacrol and a better growth fitness in the presence of carvacrol compared to wild-type strain. Whole genome sequencing revealed 10 mutations, of which four (rrsH, sseG, wbaV, and flhA) were present in more than one strain, whereas six (nirC, fliH, lon, rob, upstream yfhP, and upstream argR) were unique to individual strains. Single-mutation genetic constructs in SeWT confirmed lon and rob as responsible for the increased resistance to carvacrol as well as to antibiotics (ampicillin, ciprofloxacin, chloramphenicol, nalidixic acid, rifampicin, tetracycline, and trimethoprim). wbaV played an important role in increased tolerance against carvacrol and chloramphenicol, and flhA in cross-tolerance to heat treatments. As a conclusion, no common phenotypical or genotypical pattern was observed in the isolated resistant variants of Salmonella Typhimurium emerged under carvacrol stress. Furthermore, the demonstration of cross-resistance against heat and antibiotics exhibited by resistant variants raises concerns regarding food safety. KEY POINTS: • Stable resistant variants of Salmonella Typhimurium emerged under carvacrol stress • No common pattern of mutagenesis after cyclic exposures to carvacrol was observed • Resistant variants to carvacrol showed cross-resistance to heat and to antibiotics.
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Affiliation(s)
- Elisa Pagan
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, Zaragoza, Spain
| | - Natalia Merino
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, Zaragoza, Spain
| | - Daniel Berdejo
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, Zaragoza, Spain
| | - Raul Campillo
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, Zaragoza, Spain
| | - Elisa Gayan
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, Zaragoza, Spain
| | - Diego García-Gonzalo
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, Zaragoza, Spain
| | - Rafael Pagan
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, Zaragoza, Spain.
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2
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Waszczuk W, Czajkowska J, Dutkiewicz A, Klasa B, Carolak E, Aleksandrowicz A, Grzymajlo K. It takes two to attach - endo-1,3-β-d-glucanase as a potential receptor of mannose-independent, FimH-dependent Salmonella Typhimurium binding to spinach leaves. Food Microbiol 2024; 121:104519. [PMID: 38637081 DOI: 10.1016/j.fm.2024.104519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 03/07/2024] [Accepted: 03/09/2024] [Indexed: 04/20/2024]
Abstract
Currently, fresh, unprocessed food has become a relevant element of the chain of transmission of enteropathogenic infections. To survive on a plant surface and further spread the infections, pathogens like Salmonella have to attach stably to the leaf surface. Adhesion, driven by various virulence factors, including the most abundant fim operon encoding type 1 fimbriae, is usually an initial step of infection, preventing physical removal of the pathogen. Adhesion properties of Salmonella's type 1 fimbriae and its FimH adhesin were investigated intensively in the past. However, there is a lack of knowledge regarding its role in interaction with plant cells. Understanding the mechanisms and structures involved in such interaction may facilitate efforts to decrease the risk of contamination and increase fresh food safety. Here, we applied Salmonella genome site-directed mutagenesis, adhesion assays, protein-protein interactions, and biophysics methods based on surface plasmon resonance to unravel the role of FimH adhesin in interaction with spinach leaves. We show that FimH is at least partially responsible for Salmonella binding to spinach leaves, and this interaction occurs in a mannose-independent manner. Importantly, we identified a potential FimH receptor as endo-1,3-β-d-Glucanase and found that this interaction is strong and specific, with a dissociation constant in the nanomolar range. This research advances our comprehension of Salmonella's interactions with plant surfaces, offering insights that can aid in minimizing contamination risks and improving the safety of fresh, unprocessed foods.
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Affiliation(s)
- Wiktoria Waszczuk
- Wrocław University of Environmental and Life Sciences, Faculty of Veterinary Medicine, Department of Biochemistry and Molecular Biology, Poland.
| | - Joanna Czajkowska
- Wrocław University of Environmental and Life Sciences, Faculty of Veterinary Medicine, Department of Biochemistry and Molecular Biology, Poland.
| | - Agata Dutkiewicz
- Wrocław University of Environmental and Life Sciences, Faculty of Veterinary Medicine, Department of Biochemistry and Molecular Biology, Poland.
| | - Beata Klasa
- Wrocław University of Environmental and Life Sciences, Faculty of Veterinary Medicine, Department of Biochemistry and Molecular Biology, Poland.
| | - Ewa Carolak
- Wrocław University of Environmental and Life Sciences, Faculty of Veterinary Medicine, Department of Biochemistry and Molecular Biology, Poland.
| | - Adrianna Aleksandrowicz
- Wrocław University of Environmental and Life Sciences, Faculty of Veterinary Medicine, Department of Biochemistry and Molecular Biology, Poland.
| | - Krzysztof Grzymajlo
- Wrocław University of Environmental and Life Sciences, Faculty of Veterinary Medicine, Department of Biochemistry and Molecular Biology, Poland.
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3
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Stevens MJA, Nüesch-Inderbinen M, Horlbog JA, Diethelm A, Stephan R. Sucrose-fermenting Salmonella Typhimurium N23-2364: a challenge for the diagnostic laboratory. Diagn Microbiol Infect Dis 2024; 109:116280. [PMID: 38522369 DOI: 10.1016/j.diagmicrobio.2024.116280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 03/15/2024] [Accepted: 03/19/2024] [Indexed: 03/26/2024]
Abstract
We describe a case of Salmonella infection caused by a sucrose-fermenting Salmonella enterica Typhimurium sequence type 12 which acquired transposon CTnscr94 carrying the sucrose operon scrKYABR. Sucrose-fermenting Salmonella are particularly challenging for culture-based detection and may lead to failure to detect Salmonella in clinical samples.
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Affiliation(s)
- Marc J A Stevens
- Vetsuisse Faculty, Institute for Food Safety and Hygiene, University of Zurich, Winterthurerstrasse 272, Zurich CH-8057, Switzerland
| | - Magdalena Nüesch-Inderbinen
- Vetsuisse Faculty, Institute for Food Safety and Hygiene, University of Zurich, Winterthurerstrasse 272, Zurich CH-8057, Switzerland; Swiss National Reference Centre for Enteropathogenic Bacteria and Listeria, Switzerland
| | - Jule Anna Horlbog
- Vetsuisse Faculty, Institute for Food Safety and Hygiene, University of Zurich, Winterthurerstrasse 272, Zurich CH-8057, Switzerland; Swiss National Reference Centre for Enteropathogenic Bacteria and Listeria, Switzerland
| | - Andrea Diethelm
- Vetsuisse Faculty, Institute for Food Safety and Hygiene, University of Zurich, Winterthurerstrasse 272, Zurich CH-8057, Switzerland; Swiss National Reference Centre for Enteropathogenic Bacteria and Listeria, Switzerland
| | - Roger Stephan
- Vetsuisse Faculty, Institute for Food Safety and Hygiene, University of Zurich, Winterthurerstrasse 272, Zurich CH-8057, Switzerland.
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4
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Lu Y, Xie Q, Chen J, Chu Z, Zhang F, Wang Q. Aptamer-mediated double strand displacement amplification with microchip electrophoresis for ultrasensitive detection of Salmonella typhimurium. Talanta 2024; 273:125875. [PMID: 38452591 DOI: 10.1016/j.talanta.2024.125875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 02/27/2024] [Accepted: 03/03/2024] [Indexed: 03/09/2024]
Abstract
Rapid and quantitative detection of foodborne bacteria is of great significance to public health. In this work, an aptamer-mediated double strand displacement amplification (SDA) strategy was first explored to couple with microchip electrophoresis (MCE) for rapid and ultrasensitive detection of Salmonella typhimurium (S. Typhimurium). In double-SDA, a bacteria-identified probe consisting of the aptamer (Apt) and trigger sequence (Tr) was ingeniously designed. The aptamer showed high affinity to the S. Typhimurium, releasing the Tr sequence from the probe. The released Tr hybridized with template C1 chain, initiating the first SDA to produce numerous output strands (OS). The second SDA process was induced with the hybridization of the liberated OS and template C2 sequence, generating a large number of reporter strands (RS), which were separated and quantified through MCE. Cascade signal amplification and rapid separation of nucleic acids could be realized by the proposed double-SDA method with MCE, achieving the limit of detection for S. typhimurium down to 6 CFU/mL under the optimal conditions. Based on the elaborate design of the probes, the double-SDA assisted MCE strategy achieved better amplification performance, showing high separation efficiency and simple operation, which has satisfactory expectation for bacterial disease diagnosis.
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Affiliation(s)
- Yuqi Lu
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, PR China
| | - Qihui Xie
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, PR China
| | - Jingyi Chen
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, PR China
| | - Zhaohui Chu
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, PR China
| | - Fan Zhang
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, PR China.
| | - Qingjiang Wang
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, PR China.
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5
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Nambiar RB, Elbediwi M, Ed-Dra A, Wu B, Yue M. Epidemiology and antimicrobial resistance of Salmonella serovars Typhimurium and 4,[5],12:i- recovered from hospitalized patients in China. Microbiol Res 2024; 282:127631. [PMID: 38330818 DOI: 10.1016/j.micres.2024.127631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 12/31/2023] [Accepted: 01/24/2024] [Indexed: 02/10/2024]
Abstract
Global emergence of multidrug-resistant (MDR) Salmonella enterica serovar Typhimurium is a continuing challenge for modern healthcare. However, the knowledge, regarding the epidemiology of salmonellosis caused by the monophasic variant S. 4,[5],12:i:- in hospitalized patients, is limited in China. To bridge this gap, we carried out a retrospective study to determine the antimicrobial resistance, trends, and risk factors of S. Typhimurium and S. 4,[5],12:i:- (n = 329) recovered from patients in Zhejiang province between 2011 and 2019. The results showed that 90.57% (298/329) of the isolates were MDR; among them, 48.94% (161/329) and 12.46% (41/329) were phenotypically resistant to cephalosporins and fluoroquinolones, respectively, which are the drugs of choice used to treat salmonellosis in clinics. Additionally, we observed a higher incidence of infections among the young population (<5 years old). Notably, the higher prevalence of ST34 (sequence type 34) isolates, especially after 2014, with MDR (57.05%, 170/298) phenotype, and incidence of ST34 isolates co-harbouring mcr-1 (mobile colistin resistance gene) and blaCTX-M-14 (β-lactamase gene) suggest an association between STs and drug resistance. Together, the increasing prevalence of MDR ST34 calls for enhanced monitoring strategies to mitigate the spread and dissemination of MDR clones of S. Typhimurium and S. 4,[5],12:i-. Our study provides improved knowledge about non-typhoid Salmonella (NTS) infections, which could help in the effective recommendation of antimicrobials in hospitalized patients.
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Affiliation(s)
- Reshma B Nambiar
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou, China
| | - Mohammed Elbediwi
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou, China
| | - Abdelaziz Ed-Dra
- Laboratory of Engineering and Applied Technologies, Higher School of Technology, M'ghila Campus, Sultan Moulay Slimane University, BP: 591, Beni Mellal, Morocco
| | - Beibei Wu
- Zhejiang Provincial Center for Disease Control and Prevention, Hangzhou, China
| | - Min Yue
- Department of Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou, China; State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, National Clinical Research Center for Infectious Diseases, National Medical Center for Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China.
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6
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Mumbleau M, Chevance F, Hughes K, Hammond MC. Investigating the Effect of RNA Scaffolds on the Multicolor Fluorogenic Aptamer Pepper in Different Bacterial Species. ACS Synth Biol 2024; 13:1093-1099. [PMID: 38593047 PMCID: PMC11037261 DOI: 10.1021/acssynbio.4c00009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 03/01/2024] [Accepted: 03/04/2024] [Indexed: 04/11/2024]
Abstract
RNA synthetic biology tools have primarily been applied in E. coli; however, many other bacteria are of industrial and clinical significance. Thus, the multicolor fluorogenic aptamer Pepper was evaluated in both Gram-positive and Gram-negative bacteria. Suitable HBC-Pepper dye pairs were identified that give blue, green, or red fluorescence signals in the E. coli, Bacillus subtilis, and Salmonella enterica serovar Typhimurium (S. Typhimurium). Furthermore, we found that different RNA scaffolds have a drastic effect on in vivo fluorescence, which did not correlate with the in vitro folding efficiency. One such scaffold termed DF30-tRNA displays 199-fold greater fluorescence than the Pepper aptamer alone and permits simultaneous dual color imaging in live cells.
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Affiliation(s)
- Madeline
M. Mumbleau
- Department
of Chemistry and Henry Eyring Center for Cell and Genome Science, University of Utah, Salt Lake City, Utah 84112, United States
| | - Fabienne Chevance
- School
of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Kelly Hughes
- School
of Biological Sciences, University of Utah, Salt Lake City, Utah 84112, United States
| | - Ming C. Hammond
- Department
of Chemistry and Henry Eyring Center for Cell and Genome Science, University of Utah, Salt Lake City, Utah 84112, United States
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7
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Zhang J, Zhang S, Zhou W, Zhang X, Li G, Li R, Lin X, Chen Z, Liu F, Shen P, Zhou X, Gao Y, Chen Z, Chao Y, Wang C. A widely conserved protein Rof inhibits transcription termination factor Rho and promotes Salmonella virulence program. Nat Commun 2024; 15:3187. [PMID: 38622116 PMCID: PMC11018607 DOI: 10.1038/s41467-024-47438-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 03/18/2024] [Indexed: 04/17/2024] Open
Abstract
Transcription is crucial for the expression of genetic information and its efficient and accurate termination is required for all living organisms. Rho-dependent termination could rapidly terminate unwanted premature RNAs and play important roles in bacterial adaptation to changing environments. Although Rho has been discovered for about five decades, the regulation mechanisms of Rho-dependent termination are still not fully elucidated. Here we report that Rof is a conserved antiterminator and determine the cryogenic electron microscopy structure of Rho-Rof antitermination complex. Rof binds to the open-ring Rho hexamer and inhibits the initiation of Rho-dependent termination. Rof's N-terminal α-helix undergoes conformational changes upon binding with Rho, and is key in facilitating Rof-Rho interactions. Rof binds to Rho's primary binding site (PBS) and excludes Rho from binding with PBS ligand RNA at the initiation step. Further in vivo analyses in Salmonella Typhimurium show that Rof is required for virulence gene expression and host cell invasion, unveiling a physiological function of Rof and transcription termination in bacterial pathogenesis.
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Affiliation(s)
- Jing Zhang
- CAS Key Laboratory of Molecular Virology and Immunology, Center for Microbes, Development and Health (CMDH), Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China
| | - Shuo Zhang
- CAS Key Laboratory of Molecular Virology and Immunology, Center for Microbes, Development and Health (CMDH), Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Wei Zhou
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing, China
| | - Xiang Zhang
- The Fifth People's Hospital, Institutes of Biomedical Sciences, School of Public Health, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Guanjin Li
- CAS Key Laboratory of Molecular Virology and Immunology, Center for Microbes, Development and Health (CMDH), Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Ruoxuan Li
- CAS Key Laboratory of Molecular Virology and Immunology, Center for Microbes, Development and Health (CMDH), Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xingyu Lin
- CAS Key Laboratory of Molecular Virology and Immunology, Center for Microbes, Development and Health (CMDH), Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Ziying Chen
- CAS Key Laboratory of Molecular Virology and Immunology, Center for Microbes, Development and Health (CMDH), Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China
- The Fifth People's Hospital, Institutes of Biomedical Sciences, School of Public Health, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Fang Liu
- CAS Key Laboratory of Molecular Virology and Immunology, Center for Microbes, Development and Health (CMDH), Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China
| | - Pan Shen
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing, China
| | - Xiaogen Zhou
- College of Information Engineering, Zhejiang University of Technology, Hangzhou, China
| | - Yue Gao
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing, China.
| | - Zhenguo Chen
- The Fifth People's Hospital, Institutes of Biomedical Sciences, School of Public Health, School of Basic Medical Sciences, Fudan University, Shanghai, China.
| | - Yanjie Chao
- CAS Key Laboratory of Molecular Virology and Immunology, Center for Microbes, Development and Health (CMDH), Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China.
- University of Chinese Academy of Sciences, Beijing, China.
- Key Laboratory of RNA Science and Engineering, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Shanghai, China.
| | - Chengyuan Wang
- CAS Key Laboratory of Molecular Virology and Immunology, Center for Microbes, Development and Health (CMDH), Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China.
- University of Chinese Academy of Sciences, Beijing, China.
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8
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Daniel BBJ, Steiger Y, Sintsova A, Field CM, Nguyen BD, Schubert C, Cherrak Y, Sunagawa S, Hardt WD, Vorholt JA. Assessing microbiome population dynamics using wild-type isogenic standardized hybrid (WISH)-tags. Nat Microbiol 2024; 9:1103-1116. [PMID: 38503975 PMCID: PMC10994841 DOI: 10.1038/s41564-024-01634-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 02/09/2024] [Indexed: 03/21/2024]
Abstract
Microbiomes feature recurrent compositional structures under given environmental conditions. However, these patterns may conceal diverse underlying population dynamics that require intrastrain resolution. Here we developed a genomic tagging system, termed wild-type isogenic standardized hybrid (WISH)-tags, that can be combined with quantitative polymerase chain reaction and next-generation sequencing for microbial strain enumeration. We experimentally validated the performance of 62 tags and showed that they can be differentiated with high precision. WISH-tags were introduced into model and non-model bacterial members of the mouse and plant microbiota. Intrastrain priority effects were tested using one species of isogenic barcoded bacteria in the murine gut and the Arabidopsis phyllosphere, both with and without microbiota context. We observed colonization resistance against late-arriving strains of Salmonella Typhimurium in the mouse gut, whereas the phyllosphere accommodated Sphingomonas latecomers in a manner proportional to their presence at the late inoculation timepoint. This demonstrates that WISH-tags are a resource for deciphering population dynamics underlying microbiome assembly across biological systems.
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Affiliation(s)
| | - Yves Steiger
- Institute of Microbiology, ETH Zurich, Zurich, Switzerland
| | - Anna Sintsova
- Institute of Microbiology, ETH Zurich, Zurich, Switzerland
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9
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Gao J, Jiao Y, Zhou J, Zhang H. Rapid detection of Salmonella typhimurium by photonic PCR-LFIS dual mode visualization. Talanta 2024; 270:125553. [PMID: 38128283 DOI: 10.1016/j.talanta.2023.125553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 12/06/2023] [Accepted: 12/11/2023] [Indexed: 12/23/2023]
Abstract
Salmonella spp., as one of the foodborne pathogens, is a severe threat to global public health. Rapid screening of salmonella spp. in contaminated food with low infective doses is the key to preventing food poisoning. In this study, a fast visualization method for detecting Salmonella typhimurium (S. typhimurium) was developed based on photonic PCR and AuNPs lateral-flow immunochromatography strip (LFIS). In addition, quantitative detection of target bacteria could be achieved by utilizing the photothermal effect of AuNPs, and the sensitivity could be improved by amplifying the photothermal signal. On the optimized conditions, the developed photonic PCR-LFIS assay was highly sensitive, with a detection limit as low as 19 cfu mL-1 of bacteria in pure culture after laser irradiation, and highly specific, exhibiting no cross-reaction with Salmonella enteritidis, Listeria monocytogenes, Escherichia coli, and Staphylococcus aureus. Notably, S. typhimurium could be detected in pork, egg white, and milk without pre-treatment, with the recovery rates of the three samples between 81 % and 109 %. In conclusion, the photonic PCR-LFIS assay realizes sensitive, simple, and rapid detection of S. typhimurium.
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Affiliation(s)
- Jianxin Gao
- Shandong Provincial Key Laboratory of Animal Resistance Biology, Key Laboratory of Food Nutrition and Safety of Shandong Normal University, College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Yuru Jiao
- Shandong Provincial Key Laboratory of Animal Resistance Biology, Key Laboratory of Food Nutrition and Safety of Shandong Normal University, College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Jianhua Zhou
- Shandong Provincial Key Laboratory of Animal Resistance Biology, Key Laboratory of Food Nutrition and Safety of Shandong Normal University, College of Life Science, Shandong Normal University, Jinan, 250014, PR China.
| | - Hongyan Zhang
- Shandong Provincial Key Laboratory of Animal Resistance Biology, Key Laboratory of Food Nutrition and Safety of Shandong Normal University, College of Life Science, Shandong Normal University, Jinan, 250014, PR China.
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10
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Farias AB, Cortés-Avalos D, Ibarra JA, Perez-Rueda E. The interaction of InvF-RNAP is mediated by the chaperone SicA in Salmonella sp: an in silico prediction. PeerJ 2024; 12:e17069. [PMID: 38549779 PMCID: PMC10977090 DOI: 10.7717/peerj.17069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 02/18/2024] [Indexed: 04/02/2024] Open
Abstract
In this work we carried out an in silico analysis to understand the interaction between InvF-SicA and RNAP in the bacterium Salmonella Typhimurium strain LT2. Structural analysis of InvF allowed the identification of three possible potential cavities for interaction with SicA. This interaction could occur with the structural motif known as tetratricopeptide repeat (TPR) 1 and 2 in the two cavities located in the interface of the InvF and α-CTD of RNAP. Indeed, molecular dynamics simulations showed that SicA stabilizes the Helix-turn-Helix DNA-binding motifs, i.e., maintaining their proper conformation, mainly in the DNA Binding Domain (DBD). Finally, to evaluate the role of amino acids that contribute to protein-protein affinity, an alanine scanning mutagenesis approach, indicated that R177 and R181, located in the DBD motif, caused the greatest changes in binding affinity with α-CTD, suggesting a central role in the stabilization of the complex. However, it seems that the N-terminal region also plays a key role in the protein-protein interaction, especially the amino acid R40, since we observed conformational flexibility in this region allowing it to interact with interface residues. We consider that this analysis opens the possibility to validate experimentally the amino acids involved in protein-protein interactions and explore other regulatory complexes where chaperones are involved.
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Affiliation(s)
- André B. Farias
- Instituto de Investigaciones en Matemáticas Aplicadas y en Sistemas, Unidad Académica del Estado de Yucatán, Universidad Nacional Autónoma de México, Mérida, Yucatán, Mexico
- Laboratório Nacional de Computação Científica—LNCC, Petrópolis, Rio de Janeiro, Brazil
| | - Daniel Cortés-Avalos
- Laboratorio de Genética Microbiana, Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Universidad Nacional Autónoma de México, Ciudad de México, Ciudad de México, México
| | - J. Antonio Ibarra
- Laboratorio de Genética Microbiana, Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Universidad Nacional Autónoma de México, Ciudad de México, Ciudad de México, México
| | - Ernesto Perez-Rueda
- Instituto de Investigaciones en Matemáticas Aplicadas y en Sistemas, Unidad Académica del Estado de Yucatán, Universidad Nacional Autónoma de México, Mérida, Yucatán, Mexico
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11
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Zhao J, Han M, Ma A, Jiang F, Chen R, Dong Y, Wang X, Ruan S, Chen Y. A machine vision-assisted Argonaute-mediated fluorescence biosensor for the detection of viable Salmonella in food without convoluted DNA extraction and amplification procedures. J Hazard Mater 2024; 466:133648. [PMID: 38306835 DOI: 10.1016/j.jhazmat.2024.133648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 01/17/2024] [Accepted: 01/26/2024] [Indexed: 02/04/2024]
Abstract
The precise identification viable pathogens hold paramount significance in the prevention of foodborne diseases outbreaks. In this study, we integrated machine vision and learning with single microsphere to develop a phage and Clostridium butyricum Argonaute (CbAgo)-mediated fluorescence biosensor for detecting viable Salmonella typhimurium (S. typhimurium) without convoluted DNA extraction and amplification procedures. Phage and lysis buffer was utilized to capture and lyse viable S. typhimurium, respectively. Subsequently, CbAgo can cleave the bacterial DNA to obtain target DNA that guides a newly targeted cleavage of fluorescent probes. After that, the resulting fluorescent signal accumulates on the streptavidin-modified single microsphere. The overall detection process is then analyzed and interpreted by machine vision and learning algorithms, achieving highly sensitive detection of S. typhimurium with a limit of detection at 40.5 CFU/mL and a linear range of 50-107 CFU/mL. Furthermore, the proposed biosensor demonstrates standard recovery rates and coefficients of variation at 93.22% - 106.02% and 1.47% - 12.75%, respectively. This biosensor exhibits exceptional sensitivity and selectivity, presenting a promising method for the rapid and effective detection of foodborne pathogens. ENVIRONMENTAL IMPLICATION: Bacterial pathogens exist widely in the environment and seriously threaten the safety of human life. In this study, we developed a phage and Clostridium butyricum Argonaute-mediated fluorescence biosensor for the detection of viable Salmonella typhimurium in environmental water and food samples. Compared with other Salmonella detection methods, this method does not need complex DNA extraction and amplification steps, which reduces the use of chemical reagents and experimental consumables in classic DNA extraction kit methods.
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Affiliation(s)
- Junpeng Zhao
- College of Food Science and Technology, Huazhong Agricultural University, Shizishan Street, Hongshan District, Wuhan 430070, Hubei, China
| | - Minjie Han
- College of Food Science and Technology, Huazhong Agricultural University, Shizishan Street, Hongshan District, Wuhan 430070, Hubei, China
| | - Aimin Ma
- College of Food Science and Technology, Huazhong Agricultural University, Shizishan Street, Hongshan District, Wuhan 430070, Hubei, China
| | - Feng Jiang
- Key Laboratory of Detection Technology of Focus Chemical Hazards in Animal-derived Food for State Market Regulation, Wuhan 430075, Hubei, China
| | - Rui Chen
- College of Food Science and Technology, Huazhong Agricultural University, Shizishan Street, Hongshan District, Wuhan 430070, Hubei, China
| | - Yongzhen Dong
- State Key Laboratory of Marine Food Processing and Safety Control, Dalian Polytechnic University, Dalian 116034, Liaoning, China
| | - Xufeng Wang
- College of Food Science and Technology, Huazhong Agricultural University, Shizishan Street, Hongshan District, Wuhan 430070, Hubei, China
| | - Shilong Ruan
- Daye Public Inspection and Test Center, Daye 435100, Hubei, China
| | - Yiping Chen
- State Key Laboratory of Marine Food Processing and Safety Control, Dalian Polytechnic University, Dalian 116034, Liaoning, China.
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12
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Berdejo D, Mortier J, Cambré A, Sobota M, Van Eyken R, Kim TD, Vanoirbeek K, García Gonzalo D, Pagán R, Diard M, Aertsen A. Evolutionary trade-off between heat shock resistance, growth at high temperature, and virulence expression in Salmonella Typhimurium. mBio 2024; 15:e0310523. [PMID: 38349183 PMCID: PMC10936172 DOI: 10.1128/mbio.03105-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 01/12/2024] [Indexed: 03/14/2024] Open
Abstract
Understanding the evolutionary dynamics of foodborne pathogens throughout our food production chain is of utmost importance. In this study, we reveal that Salmonella Typhimurium can readily and reproducibly acquire vastly increased heat shock resistance upon repeated exposure to heat shock. Counterintuitively, this boost in heat shock resistance was invariantly acquired through loss-of-function mutations in the dnaJ gene, encoding a heat shock protein that acts as a molecular co-chaperone of DnaK and enables its role in protein folding and disaggregation. As a trade-off, however, the acquisition of heat shock resistance inevitably led to attenuated growth at 37°C and higher temperatures. Interestingly, loss of DnaJ also downregulated the activity of the master virulence regulator HilD, thereby lowering the fraction of virulence-expressing cells within the population and attenuating virulence in mice. By connecting heat shock resistance evolution to attenuation of HilD activity, our results confirm the complex interplay between stress resistance and virulence in Salmonella Typhimurium. IMPORTANCE Bacterial pathogens such as Salmonella Typhimurium are equipped with both stress response and virulence features in order to navigate across a variety of complex inhospitable environments that range from food-processing plants up to the gastrointestinal tract of its animal host. In this context, however, it remains obscure whether and how adaptation to one environment would obstruct fitness in another. In this study, we reveal that severe heat stress counterintuitively, but invariantly, led to the selection of S. Typhimurium mutants that are compromised in the activity of the DnaJ heat shock protein. While these mutants obtained massively increased heat resistance, their virulence became greatly attenuated. Our observations, therefore, reveal a delicate balance between optimal tuning of stress response and virulence features in bacterial pathogens.
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Affiliation(s)
- Daniel Berdejo
- Department of Microbial and Molecular Systems, KU Leuven, Leuven, Belgium
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, Zaragoza, Spain
| | - Julien Mortier
- Department of Microbial and Molecular Systems, KU Leuven, Leuven, Belgium
| | - Alexander Cambré
- Department of Microbial and Molecular Systems, KU Leuven, Leuven, Belgium
| | | | - Ronald Van Eyken
- Department of Microbial and Molecular Systems, KU Leuven, Leuven, Belgium
| | - Tom Dongmin Kim
- Department of Microbial and Molecular Systems, KU Leuven, Leuven, Belgium
| | - Kristof Vanoirbeek
- Department of Microbial and Molecular Systems, KU Leuven, Leuven, Belgium
| | - Diego García Gonzalo
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, Zaragoza, Spain
| | - Rafael Pagán
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2, Universidad de Zaragoza-CITA, Zaragoza, Spain
| | | | - Abram Aertsen
- Department of Microbial and Molecular Systems, KU Leuven, Leuven, Belgium
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13
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Porwollik S, Chu W, Desai PT, McClelland M. A genome-wide collection of barcoded single-gene deletion mutants in Salmonella enterica serovar Typhimurium. PLoS One 2024; 19:e0298419. [PMID: 38452024 PMCID: PMC10919679 DOI: 10.1371/journal.pone.0298419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 01/24/2024] [Indexed: 03/09/2024] Open
Abstract
Genetic screening of pools of mutants can reveal genetic determinants involved in complex biological interactions, processes, and systems. We previously constructed two single-gene deletion resources for Salmonella enterica serovar Typhimurium 14028s in which kanamycin (KanR) and chloramphenicol (CamR) cassettes were used to replace non-essential genes. We have now used lambda-red recombination to convert the antibiotic cassettes in these resources into a tetracycline-resistant (TetR) version where each mutant contains a different 21-base barcode flanked by Illumina Read1 and Read2 primer sequences. A motility assay of a pool of the entire library, followed by a single-tube processing of the bacterial pellet, PCR, and sequencing, was used to verify the performance of the barcoded TetR collection. The new resource is useful for experiments with defined subsets of barcoded mutant strains where biological bottlenecks preclude high numbers of founder bacteria, such as in animal infections. The TetR version of the library will also facilitate the construction of triple mutants by transduction. The resource of 6197 mutants covering 3490 genes is deposited at Biological and Emerging Infections Resources (beiresources.org).
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Affiliation(s)
- Steffen Porwollik
- Dept. of Microbiology and Molecular Genetics, University of California, Irvine, Irvina, CA, United States of America
| | - Weiping Chu
- Dept. of Microbiology and Molecular Genetics, University of California, Irvine, Irvina, CA, United States of America
| | - Prerak T. Desai
- GSK Computational Biology, Upper Providence, PA, United States of America
| | - Michael McClelland
- Dept. of Microbiology and Molecular Genetics, University of California, Irvine, Irvina, CA, United States of America
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14
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Fernandes AS, de Melo Bisneto AV, Silva LS, Flávia Luiz Cardoso Bailão E, Cardoso CG, Carneiro CC, da Costa Santos S, Chen-Chen L. Tellimagrandin-I and camptothin a exhibit chemopreventive effects in Salmonella enterica serovar Typhimurium strains and human lymphocytes. J Toxicol Environ Health A 2024; 87:185-198. [PMID: 38073488 DOI: 10.1080/15287394.2023.2290641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Tellimagrandin-I (TL) and camptothin A (CA) are ellagitannins widely found in diverse plant species. Numerous studies demonstrated their significant biological activities, which include antitumor, antioxidant, and hepatoprotective properties. Despite this protective profile, the effects of TL and CA on DNA have not been comprehensively investigated. Thus, the aim of this study was to determine the mutagenic and antimutagenic effects attributed to TL and CA exposure on Salmonella enterica serovar Typhimurium strains using the Ames test. In addition, the cytotoxic and genotoxic effects were examined on human lymphocytes, employing both trypan blue exclusion and CometChip assay. The antigenotoxic effect was determined following TL and CA exposure in the presence of co-treatment with doxorubicin (DXR). Our results from the Ames test indicated that TL or CA did not display marked mutagenic activity. However, TL or CA demonstrated an ability to protect DNA against the damaging effects of the mutagens 4-nitroquinoline-1-oxide and sodium azide, thereby exhibiting antimutagenic properties. In relation to human lymphocytes, TL or CA did not induce significant cytotoxic or genotoxic actions on these cells. Further, these ellagitannins exhibited an ability to protect DNA from damage induced by DOX during co-treatment, indicating their potential beneficial usefulness as antigenotoxic agents. In conclusion, the protective effects of TL or CA against mutagens, coupled with their absence of genotoxic and cytotoxic effects on human lymphocytes, emphasize their potential therapeutic value in chemopreventive strategies.
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Affiliation(s)
- Amanda Silva Fernandes
- Laboratory of Radiobiology and Mutagenesis, Institute of Biological Sciences, Federal University of Goiás, Goiânia, Goiás, Brazil
| | - Abel Vieira de Melo Bisneto
- Laboratory of Radiobiology and Mutagenesis, Institute of Biological Sciences, Federal University of Goiás, Goiânia, Goiás, Brazil
| | - Luana Santos Silva
- Laboratory of Radiobiology and Mutagenesis, Institute of Biological Sciences, Federal University of Goiás, Goiânia, Goiás, Brazil
| | | | - Clever Gomes Cardoso
- Laboratory of Radiobiology and Mutagenesis, Institute of Biological Sciences, Federal University of Goiás, Goiânia, Goiás, Brazil
| | - Cristiene Costa Carneiro
- Laboratory of Radiobiology and Mutagenesis, Institute of Biological Sciences, Federal University of Goiás, Goiânia, Goiás, Brazil
| | | | - Lee Chen-Chen
- Laboratory of Radiobiology and Mutagenesis, Institute of Biological Sciences, Federal University of Goiás, Goiânia, Goiás, Brazil
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15
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Cohen E, Azriel S, Auster O, Gal A, Mikhlin S, Crauwels S, Rahav G, Gal-Mor O. A new Salmonella enterica serovar that was isolated from a wild sparrow presents a distinct genetic, metabolic and virulence profile. Microbes Infect 2024; 26:105249. [PMID: 37956735 DOI: 10.1016/j.micinf.2023.105249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 10/31/2023] [Accepted: 11/06/2023] [Indexed: 11/15/2023]
Abstract
Salmonella enterica is a ubiquitous and clinically-important bacterial pathogen, able to infect and cause different diseases in a wide range of hosts. Here, we report the isolation and characterization of a new S. enterica serovar (13,23:i:-; S. Tirat-Zvi), belonging to the Havana supper-lineage that was isolated from a wild house sparrow (Passer domesticus) in Israel. Whole genome sequencing and complete assembly of its genome indicated a plasmid-free, 4.7 Mb genome that carries the Salmonella pathogenicity islands 1-6, 9, 19 and an integrative and conjugative element (ICE), encoding arsenic resistance genes. Phenotypically, S. Tirat-Zvi isolate TZ282 was motile, readily formed biofilm, more versatile in carbon source utilization than S. Typhimurium and highly tolerant to arsenic, but impaired in host cell invasion. In-vivo infection studies indicated that while S. Tirat-Zvi was able to infect and cause an acute inflammatory enterocolitis in young chicks, it was compromised in mice colonization and did not cause an inflammatory colitis in mice compared to S. Typhimurium. We suggest that these phenotypes reflect the distinctive ecological niche of this new serovar and its evolutionary adaptation to passerine birds, as a permissive host. Moreover, these results further illuminate the genetic, phenotypic and ecological diversity of S. enterica pathovars.
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Affiliation(s)
- Emiliano Cohen
- The Infectious Diseases Research Laboratory, Sheba Medical Center, Tel-Hashomer, Israel
| | - Shalevet Azriel
- The Infectious Diseases Research Laboratory, Sheba Medical Center, Tel-Hashomer, Israel
| | - Oren Auster
- The Infectious Diseases Research Laboratory, Sheba Medical Center, Tel-Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Department of Clinical Microbiology and Immunology, Tel Aviv University, Tel Aviv, Israel
| | - Adiv Gal
- Faculty of Sciences, Kibbutzim College, Tel-Aviv, Israel
| | | | - Sam Crauwels
- Laboratory for Process Microbial Ecology and Bioinspirational Management (PME&BIM), Centre of Microbial and Plant Genetics (CMPG), Department of Microbial and Molecular Systems (M2S), KU Leuven, Leuven, Belgium
| | - Galia Rahav
- The Infectious Diseases Research Laboratory, Sheba Medical Center, Tel-Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Ohad Gal-Mor
- The Infectious Diseases Research Laboratory, Sheba Medical Center, Tel-Hashomer, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Department of Clinical Microbiology and Immunology, Tel Aviv University, Tel Aviv, Israel.
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16
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Zhang Q, Liu Y, Zhang J, Wang Q, Ying F, Liu D, Wen J, Zhao G, Li Q. Gene expression response to Salmonella Typhimurium in the cecal tonsil reveals a potential mechanism of resistance in chickens. Poult Sci 2024; 103:103356. [PMID: 38215505 PMCID: PMC10825355 DOI: 10.1016/j.psj.2023.103356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 11/17/2023] [Accepted: 12/02/2023] [Indexed: 01/14/2024] Open
Abstract
Salmonella has been one of the most important factors restricting the development of the poultry industry and also poses great threat to public health. To get insight into molecular alterations that occur during bacterial infection, we sequenced the cecal tonsil transcriptome in 2 chicken breeds (Beijing-You and Cobb) known to have differing resistance to Salmonella. The 28-day-old chickens were orally challenged by 1.83 × 1011 CFU Salmonella Typhimurium, and the cecal tonsil transcriptome was sequenced 3 d postinfection. Analysis identified 201 and 170 differentially expressed genes response to Salmonella in 2 chicken breeds, respectively. They were involved in the Toll-like receptor signaling pathway and activated the production of pro-inflammatory cytokines and chemokines. The protein-protein interaction (PPI) network suggested MMP9 as a crucial protein that may be involved in extracellular matrix breakdown and leukocyte migration in the resistant breed (Beijing-You). Meanwhile, in susceptible chickens (Cobb), ACOD1 was the key gene in the PPI network and might promote the expression of genes related to oxidative stress response and gastrointestinal tract function. These findings provide insight into the differing resistance of these 2 chicken breeds.
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Affiliation(s)
- Qi Zhang
- Institute of Animal Sciences; State Key Laboratory of Animal Nutrition, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Yuhong Liu
- Institute of Animal Sciences; State Key Laboratory of Animal Nutrition, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Jin Zhang
- Institute of Animal Sciences; State Key Laboratory of Animal Nutrition, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Qiao Wang
- Institute of Animal Sciences; State Key Laboratory of Animal Nutrition, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Fan Ying
- Foshan Gaoming Xinguang Agricultural and Animal Industrials Corporation, Foshan, 528515, China
| | - Dawei Liu
- Foshan Gaoming Xinguang Agricultural and Animal Industrials Corporation, Foshan, 528515, China
| | - Jie Wen
- Institute of Animal Sciences; State Key Laboratory of Animal Nutrition, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Guiping Zhao
- Institute of Animal Sciences; State Key Laboratory of Animal Nutrition, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Qinghe Li
- Institute of Animal Sciences; State Key Laboratory of Animal Nutrition, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
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17
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Chandra HB, Lalhmangaihzuali L, Shome A, Sahoo R, Irungbam K, Mahawar M. Comparative analysis reveals the trivial role of MsrP in defending oxidative stress and virulence of Salmonella Typhimurium in mice. Free Radic Biol Med 2024; 213:322-326. [PMID: 38262547 DOI: 10.1016/j.freeradbiomed.2024.01.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/10/2024] [Accepted: 01/14/2024] [Indexed: 01/25/2024]
Abstract
Sulphur containing amino acids, methionine and cysteine are highly prone to oxidation. Reduction of oxidized methionine (Met-SO) residues to methionine (Met) by methionine sulfoxide reductases (Msrs) enhances the survival of bacterial pathogens under oxidative stress conditions. S. Typhimurium encodes two types (cytoplasmic and periplasmic) of Msrs. Periplasmic proteins, due to their location are highly vulnerable to host-generated oxidants. Therefore, the periplasmic Msr (MsrP) mediated repair (as compared to the cytoplasmic counterpart) might play a more imperative role in defending host-generated oxidants. Contrary to this, we show that in comparison to the ΔmsrP strain, the mutant strains in the cytoplasmic Msrs (ΔmsrA and ΔmsrAC strains) showed many folds more susceptibility to chloramine-T and neutrophils. Further ΔmsrA and ΔmsrAC strains accumulated higher levels of ROS and showed compromised fitness in mice spleen and liver. Our data suggest the pivotal role of cytoplasmic Msrs in oxidative stress survival of S. Typhimurium.
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Affiliation(s)
- Hari Balaji Chandra
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar 243 122, India
| | - L Lalhmangaihzuali
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar 243 122, India
| | - Arijit Shome
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar 243 122, India
| | - Raj Sahoo
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar 243 122, India
| | - Karuna Irungbam
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar 243 122, India
| | - Manish Mahawar
- Division of Biochemistry, ICAR-Indian Veterinary Research Institute, Izatnagar 243 122, India.
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18
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Xu X, Peng M, Wang Y, Zhu F, Shen W, Bao D. Genomic and epidemiological characterization of a bla CTX-M-27-carrying ST34 Salmonella enterica serotype Typhimurium in China. J Glob Antimicrob Resist 2024; 36:345-349. [PMID: 38122981 DOI: 10.1016/j.jgar.2023.12.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 11/27/2023] [Accepted: 12/11/2023] [Indexed: 12/23/2023] Open
Abstract
OBJECTIVES Consuming contaminated food and water is a leading cause of food poisoning, with Salmonella being one of the primary culprits. The aim of this study is to elucidate the genomic characteristics of a blaCTX-M-27-carrying S. enterica strain recovered from a patient with diarrhoea in China. METHODS Antimicrobial susceptibility of S. enterica strain 123 was determined by microdilution broth assay. Whole-genome sequencing was performed using both long-read MinION and short-read Illumina platforms to fully characterize the genetic structure of the blaCTX-M-27-carrying plasmid of the S. enterica 123. In silico multilocus sequence typing (MLST), antimicrobial resistance genes and genomic epidemiological analysis of 69 Salmonella strains carrying the blaCTX-M-27 gene stored in NCBI GenBank were further analysed by BacWGSTdb 2.0 server. RESULTS The isolate was resistant to ampicillin, ampicillin/sulbactam, ceftazidime, ceftriaxone, cefepime, aztreonam, azithromycin, but still susceptible to ciprofloxacin, levofloxacin, imipenem, amikacin, trimethoprim-sulfamethoxazole and gentamicin. The complete genome sequence of Salmonella 123 is made up of one chromosome and three plasmids, which could be assigned as sequence type (ST)34. The blaCTX-M-27 gene was found in the 65 644 bp IncFII-type plasmid with IS26 and IS5 exist upstream of blaCTX-M-27 gene, and IS26 and IS1B are located downstream as a truncated fragment. The closest relative of Salmonella 123 was Salmonella strain La89, another ST34 strain recovered in 2011, which differed by only 52 SNPs. CONCLUSION This study reports the complete genome of a blaCTX-M-27-carrying S. enterica that can be used for gaining insights into the antimicrobial resistance mechanisms and dissemination patterns of the emerging pandemic lineage ST34.
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Affiliation(s)
- Xiaohong Xu
- Department of Clinical Laboratory, Sanmen People's Hospital, Sanmen Bay Branch of The First Affiliated Hospital, Zhejiang University School of Medicine, Taizhou, Zhejiang, China
| | - Minfei Peng
- Department of Clinical Laboratory, Taizhou Hospital of Zhejiang Province affiliated to Wenzhou Medical University, Taizhou, China
| | - Yizhang Wang
- Department of Clinical Laboratory, Sanmen People's Hospital, Sanmen Bay Branch of The First Affiliated Hospital, Zhejiang University School of Medicine, Taizhou, Zhejiang, China
| | - Fengjiao Zhu
- Department of Clinical Laboratory, Sanmen People's Hospital, Sanmen Bay Branch of The First Affiliated Hospital, Zhejiang University School of Medicine, Taizhou, Zhejiang, China
| | - Weiwei Shen
- Taizhou Center for Disease Control and Prevention, Taizhou, Zhejiang, China.
| | - Danni Bao
- Department of Clinical Laboratory, Sanmen People's Hospital, Sanmen Bay Branch of The First Affiliated Hospital, Zhejiang University School of Medicine, Taizhou, Zhejiang, China.
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19
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Wenner N, Zhu X, Rowe WPM, Händler K, Hinton JCD. Succinate utilisation by Salmonella is inhibited by multiple regulatory systems. PLoS Genet 2024; 20:e1011142. [PMID: 38457455 DOI: 10.1371/journal.pgen.1011142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/26/2024] [Accepted: 01/19/2024] [Indexed: 03/10/2024] Open
Abstract
Succinate is a potent immune signalling molecule that is present in the mammalian gut and within macrophages. Both of these infection niches are colonised by the pathogenic bacterium Salmonella enterica serovar Typhimurium during infection. Succinate is a C4-dicarboyxlate that can serve as a source of carbon for bacteria. When succinate is provided as the sole carbon source for in vitro cultivation, Salmonella and other enteric bacteria exhibit a slow growth rate and a long lag phase. This growth inhibition phenomenon was known to involve the sigma factor RpoS, but the genetic basis of the repression of bacterial succinate utilisation was poorly understood. Here, we use an experimental evolution approach to isolate fast-growing mutants during growth of S. Typhimurium on succinate containing minimal medium. Our approach reveals novel RpoS-independent systems that inhibit succinate utilisation. The CspC RNA binding protein restricts succinate utilisation, an inhibition that is antagonised by high levels of the small regulatory RNA (sRNA) OxyS. We discovered that the Fe-S cluster regulatory protein IscR inhibits succinate utilisation by repressing the C4-dicarboyxlate transporter DctA. Furthermore, the ribose operon repressor RbsR is required for the complete RpoS-driven repression of succinate utilisation, suggesting a novel mechanism of RpoS regulation. Our discoveries shed light on the redundant regulatory systems that tightly regulate the utilisation of succinate. We speculate that the control of central carbon metabolism by multiple regulatory systems in Salmonella governs the infection niche-specific utilisation of succinate.
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Affiliation(s)
- Nicolas Wenner
- Clinical Infection, Microbiology & Immunology, Institute of Infection, Veterinary & Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Xiaojun Zhu
- Clinical Infection, Microbiology & Immunology, Institute of Infection, Veterinary & Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Will P M Rowe
- Clinical Infection, Microbiology & Immunology, Institute of Infection, Veterinary & Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Kristian Händler
- Department of Microbiology, School of Genetics and Microbiology, Moyne Institute of Preventive Medicine, Trinity College Dublin, Dublin, Ireland
| | - Jay C D Hinton
- Clinical Infection, Microbiology & Immunology, Institute of Infection, Veterinary & Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
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20
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Fischerström K, Dryselius R, Lindblad M, Kühlmann-Berenzon S, Karamehmedovic N, Börjesson S, Hashemi N, Gunn I, Gustavsson AM, Lindroos N, Nederby-Öhd J, Widerström M, Rimhanen-Finne R, Vainio A, Rehn M. Outbreak of Salmonella Typhimurium linked to Swedish pre-washed rocket salad, Sweden, September to November 2022. Euro Surveill 2024; 29:2300299. [PMID: 38456218 PMCID: PMC10986667 DOI: 10.2807/1560-7917.es.2024.29.10.2300299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 12/04/2023] [Indexed: 03/09/2024] Open
Abstract
In September 2022, the Public Health Agency of Sweden observed an increase in domestic Salmonella Typhimurium cases through the Swedish electronic notification system, and an outbreak strain was identified with whole genome sequencing. Overall, 109 cases with symptom onset between 17 September and 24 November 2022 were reported from 20 of 21 Swedish regions. The median age of cases was 52 years (range 4-87 years) and 62% were female. A case-control study found cases to be associated with consumption of rocket salad (adjusted odds ratio (aOR) = 4.9; 95% confidence interval (CI): 2.4-10, p value < 0.001) and bagged mixed salad (aOR = 4.0; 95% CI: 1.9-8.1, p value < 0.001). Trace-back, supported by Finnish authorities who identified the Swedish outbreak strain in a Finnish cluster during the same time period, identified rocket salad, cultivated, pre-washed and pre-packed in Sweden as the likely source of the outbreak. No microbiological analyses of rocket salad were performed. Our investigation indicates that bagged leafy greens such as rocket salad, regardless of pre-washing procedures in the production chain, may contain Salmonella and cause outbreaks, posing a health risk to consumers. We emphasise the need for primary producers of leafy greens to identify possible contamination points to prevent outbreaks.
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Affiliation(s)
- Karolina Fischerström
- ECDC Fellowship Programme, Field Epidemiology path (EPIET), European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
- Public Health Agency of Sweden (PHAS), Solna, Sweden
| | | | | | | | | | - Stefan Börjesson
- School of Health Science, Örebro University, Örebro, Sweden
- Public Health Agency of Sweden (PHAS), Solna, Sweden
| | | | - Ingrid Gunn
- Department of Infectious Disease Prevention and Control, Region Kalmar County, Kalmar, Sweden
| | - Ann-Mari Gustavsson
- Department of Infection Prevention and Control, County of Värmland, Karlstad, Sweden
| | - Nilla Lindroos
- Department of Infectious Disease Prevention and Control, Region Halland, Halmstad, Sweden
| | - Joanna Nederby-Öhd
- Department of Infectious Disease Prevention and Control, Stockholm Region, Stockholm, Sweden
| | | | - Ruska Rimhanen-Finne
- Department of Health Security, Finnish Institute for Health and Welfare, Helsinki, Finland
| | - Anni Vainio
- Department of Health Security, Finnish Institute for Health and Welfare, Helsinki, Finland
| | - Moa Rehn
- Public Health Agency of Sweden (PHAS), Solna, Sweden
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Yusof YA, Azizul Hasan ZA, Abd Maurad Z. Mutagenicity Assessment of Homologous Series of Methyl Ester Sulphonates (MES) Using the Bacterial Reverse Mutation (Ames) Test. Int J Toxicol 2024; 43:157-164. [PMID: 38048784 DOI: 10.1177/10915818231217041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
Methyl ester sulphonate (MES) is an anionic surfactant that is suitable to be used as an active ingredient in household products. Four palm-based MES compounds with various carbon chains, namely C12, C14, C16 and C16/18 MES, were assayed by the in vitro bacterial reverse mutation (Ames) test in the Salmonella typhimurium strains TA98, TA100, TA1535, and TA1537 and the Escherichia coli strain WP2 uvrA, with the aim of establishing the safety data of the compounds, specifically their mutagenicity. The test was also carried out on linear alkylbenzene sulphonate (LAS) for comparison. The plate incorporation method was conducted according to the Organization for Economic Cooperation and Development (OECD) Test Guideline 471. All compounds were tested at five analysable non-cytotoxic concentrations, varying from .001 mg/plate to 5 mg/plate, with and without S-9 metabolic activation. All tested concentrations showed no significant increase in the number of revertant colonies compared to revertant colonies of the negative control. The Ames test indicated that each concentration of C12, C14, C16, C16/18 MES, and LAS used in this study induced neither base-pair substitutions nor frame-shift mutations in the S. typhimurium strains TA98, TA100, TA1535, and TA1537 and the E. coli strain WP2 uvrA. The results showed that C12, C14, C16 and C16/18 MES have no potential mutagenic properties in the presence and absence of S-9 metabolic activation, similarly to LAS. Therefore, the MES is safe to be used as an alternative to petroleum-based surfactants for household cleaning products.
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Gasperini G, Massai L, De Simone D, Raso MM, Palmieri E, Alfini R, Rossi O, Ravenscroft N, Kuttel MM, Micoli F. O-Antigen decorations in Salmonella enterica play a key role in eliciting functional immune responses against heterologous serovars in animal models. Front Cell Infect Microbiol 2024; 14:1347813. [PMID: 38487353 PMCID: PMC10937413 DOI: 10.3389/fcimb.2024.1347813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 02/15/2024] [Indexed: 03/17/2024] Open
Abstract
Introduction Different serovars of Salmonella enterica cause systemic diseases in humans including enteric fever, caused by S. Typhi and S. Paratyphi A, and invasive nontyphoidal salmonellosis (iNTS), caused mainly by S. Typhimurium and S. Enteritidis. No vaccines are yet available against paratyphoid fever and iNTS but different strategies, based on the immunodominant O-Antigen component of the lipopolysaccharide, are currently being tested. The O-Antigens of S. enterica serovars share structural features including the backbone comprising mannose, rhamnose and galactose as well as further modifications such as O-acetylation and glucosylation. The importance of these O-Antigen decorations for the induced immunogenicity and cross-reactivity has been poorly characterized. Methods These immunological aspects were investigated in this study using Generalized Modules for Membrane Antigens (GMMA) as delivery systems for the different O-Antigen variants. This platform allowed the rapid generation and in vivo testing of defined and controlled polysaccharide structures through genetic manipulation of the O-Antigen biosynthetic genes. Results Results from mice and rabbit immunization experiments highlighted the important role played by secondary O-Antigen decorations in the induced immunogenicity. Moreover, molecular modeling of O-Antigen conformations corroborated the likelihood of cross-protection between S. enterica serovars. Discussion Such results, if confirmed in humans, could have a great impact on the design of a simplified vaccine composition able to maximize functional immune responses against clinically relevant Salmonella enterica serovars.
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Affiliation(s)
| | - Luisa Massai
- GSK Vaccines Institute for Global Health (GVGH), Siena, Italy
| | | | | | - Elena Palmieri
- GSK Vaccines Institute for Global Health (GVGH), Siena, Italy
| | - Renzo Alfini
- GSK Vaccines Institute for Global Health (GVGH), Siena, Italy
| | - Omar Rossi
- GSK Vaccines Institute for Global Health (GVGH), Siena, Italy
| | - Neil Ravenscroft
- Department of Chemistry, University of Cape Town, Rondebosch, South Africa
| | - Michelle M. Kuttel
- Department of Computer Science, University of Cape Town, Rondebosch, South Africa
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23
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Sarkhel R, Priyadarsini S, Mahawar M. Nutrient limitation and oxidative stress induce the promoter of acetate operon in Salmonella Typhimurium. Arch Microbiol 2024; 206:126. [PMID: 38411730 DOI: 10.1007/s00203-024-03863-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 01/22/2024] [Accepted: 01/23/2024] [Indexed: 02/28/2024]
Abstract
Glyoxylate shunt is an important pathway for microorganisms to survive under multiple stresses. One of its enzymes, malate synthase (encoded by aceB gene), has been widely speculated for its contribution to both the pathogenesis and virulence of various microorganisms. We have previously demonstrated that malate synthase (MS) is required for the growth of Salmonella Typhimurium (S. Typhimurium) under carbon starvation and survival under oxidative stress conditions. The aceB gene is encoded by the acetate operon in S. Typhimurium. We attempted to study the activity of acetate promoter under both the starvation and oxidative stress conditions in a heterologous system. The lac promoter of the pUC19 plasmid was substituted with the putative promoter sequence of the acetate operon of S. Typhimurium upstream to the lacZ gene and transformed the vector construct into E. coli NEBα cells. The transformed cells were subjected to the stress conditions mentioned above. We observed a fourfold increase in the β-galactosidase activity in these cells resulting from the upregulation of the lacZ gene in the stationary phase of cell growth (nutrient deprived) as compared to the mid-log phase. Following exposure of stationary phase cells to hypochlorite-induced oxidative stress, we further observed a 1.6-fold increase in β galactosidase activity. These data suggest the induction of promoter activity of the acetate operon under carbon starvation and oxidative stress conditions. Thus, these observations corroborate our previous findings regarding the upregulation of aceB expression under stressful environments.
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Affiliation(s)
- Ratanti Sarkhel
- ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India
| | - Swagatika Priyadarsini
- ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India.
- Indian Council of Agricultural Research- National Research Centre on Camel, Bikaner, Rajasthan, India.
| | - Manish Mahawar
- ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh, India.
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Baugh AC, Defalco JB, Duscent-Maitland CV, Tumen-Velasquez MP, Laniohan NS, Figatner K, Hoover TR, Karls AC, Elliott KT, Neidle EL. Regulation of tricarboxylate transport and metabolism in Acinetobacter baylyi ADP1. Appl Environ Microbiol 2024; 90:e0211123. [PMID: 38289138 PMCID: PMC10880598 DOI: 10.1128/aem.02111-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 12/13/2023] [Indexed: 02/22/2024] Open
Abstract
Despite the significant presence of plant-derived tricarboxylic acids in some environments, few studies detail the bacterial metabolism of trans-aconitic acid (Taa) and tricarballylic acid (Tcb). In a soil bacterium, Acinetobacter baylyi ADP1, we discovered interrelated pathways for the consumption of Taa and Tcb. An intricate regulatory scheme tightly controls the transport and catabolism of both compounds and may reflect that they can be toxic inhibitors of the tricarboxylic acid cycle. The genes encoding two similar LysR-type transcriptional regulators, TcuR and TclR, were clustered on the chromosome with tcuA and tcuB, genes required for Tcb consumption. The genetic organization differed from that in Salmonella enterica serovar Typhimurium, in which tcuA and tcuB form an operon with a transporter gene, tcuC. In A. baylyi, tcuC was not cotranscribed with tcuAB. Rather, tcuC was cotranscribed with a gene, designated pacI, encoding an isomerase needed for Taa consumption. TcuC appears to transport Tcb and cis-aconitic acid (Caa), the presumed product of PacI-mediated periplasmic isomerization of Taa. Two operons, tcuC-pacI and tcuAB, were transcriptionally controlled by both TcuR and TclR, which have overlapping functions. We investigated the roles of the two regulators in activating transcription of both operons in response to multiple effector compounds, including Taa, Tcb, and Caa.IMPORTANCEIngestion of Taa and Tcb by grazing livestock can cause a serious metabolic disorder called grass tetany. The disorder, which results from Tcb absorption by ruminants, focuses attention on the metabolism of tricarboxylic acids. Additional interest stems from efforts to produce tricarboxylic acids as commodity chemicals. Improved understanding of bacterial enzymes and pathways for tricarboxylic acid metabolism may contribute to new biomanufacturing strategies.
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Affiliation(s)
- Alyssa C. Baugh
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
| | - Justin B. Defalco
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
| | | | | | | | - Kayla Figatner
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
| | - Timothy R. Hoover
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
| | - Anna C. Karls
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
| | | | - Ellen L. Neidle
- Department of Microbiology, University of Georgia, Athens, Georgia, USA
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25
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Zhao QY, Zhang L, Yang JT, Wei HJ, Zhang YH, Wang JY, Liu WZ, Jiang HX. Diversity of evolution in MDR monophasic S. Typhimurium among food animals and food products in Southern China from 2011 to 2018. Int J Food Microbiol 2024; 412:110572. [PMID: 38237416 DOI: 10.1016/j.ijfoodmicro.2024.110572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 01/02/2024] [Accepted: 01/06/2024] [Indexed: 01/28/2024]
Abstract
The monophasic variant of Salmonella enterica serovar Typhimurium with the antigenic formula 1,4,[5],12:i:- is one of the most common pathogenic bacteria causing global food-borne outbreaks. However, the research on molecular characteristics and evolution of monophasic S. typhimurium in China is still lacking. In the current study, 59 monophasic S. typhimurium strains were isolated from food animals and food products in South China between 2011 and 2018. A total of 87.5 % of monophasic S. typhimurium isolates were grouped into one independent clade with other monophasic S. typhimurium strains in China distinct from other countries by phylogenomic analysis. These isolates possess variable genotypes, including multiple ARGs on plasmid IncHI2, diverse evolutions at the fljAB locus, and virulence factors. Our results suggest that the monophasic S. typhimurium isolates currently circulating in China might be an independent epidemic subtype.
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Affiliation(s)
- Qiu-Yun Zhao
- Guangdong Key Laboratory for Veterinary Pharmaceutics Development and Safety evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection & Internet Technology, Zhejiang International Science and Technology Cooperation Base for Veterinary Medicine and Health Management, China-Australia Joint Laboratory for Animal Health Big Data Analytics, College of Animal Science and Technology & College of Veterinary Medicine of Zhejiang A&F University, Hangzhou 311300, China
| | - Lin Zhang
- Guangdong Key Laboratory for Veterinary Pharmaceutics Development and Safety evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Jin-Tao Yang
- Guangdong Key Laboratory for Veterinary Pharmaceutics Development and Safety evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Hai-Jing Wei
- Guangdong Key Laboratory for Veterinary Pharmaceutics Development and Safety evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Yu-Hua Zhang
- Guangdong Key Laboratory for Veterinary Pharmaceutics Development and Safety evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Jiang-Yang Wang
- Guangdong Key Laboratory for Veterinary Pharmaceutics Development and Safety evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Wen-Zi Liu
- Guangdong Key Laboratory for Veterinary Pharmaceutics Development and Safety evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
| | - Hong-Xia Jiang
- Guangdong Key Laboratory for Veterinary Pharmaceutics Development and Safety evaluation, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China.
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Roy A, Karttunen M. A Molecular Dynamics Simulation Study of the Effects of βGln114 Mutation on the Dynamic Behavior of the Catalytic Site of the Tryptophan Synthase. J Chem Inf Model 2024; 64:983-1003. [PMID: 38291608 DOI: 10.1021/acs.jcim.3c01966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
L-tryptophan (l-Trp), a vital amino acid for the survival of various organisms, is synthesized by the enzyme tryptophan synthase (TS) in organisms such as eubacteria, archaebacteria, protista, fungi, and plantae. TS, a pyridoxal 5'-phosphate (PLP)-dependent enzyme, comprises α and β subunits that typically form an α2β2 tetramer. The enzyme's activity is regulated by the conformational switching of its α and β subunits between the open (T state) and closed (R state) conformations. Many microorganisms rely on TS for growth and replication, making the enzyme and the l-Trp biosynthetic pathway potential drug targets. For instance, Mycobacterium tuberculosis, Chlamydiae bacteria, Streptococcus pneumoniae, Francisella tularensis, Salmonella bacteria, and Cryptosporidium parasitic protozoa depend on l-Trp synthesis. Antibiotic-resistant salmonella strains have emerged, underscoring the need for novel drugs targeting the l-Trp biosynthetic pathway, especially for salmonella-related infections. A single amino acid mutation can significantly impact enzyme function, affecting stability, conformational dynamics, and active or allosteric sites. These changes influence interactions, catalytic activity, and protein-ligand/protein-protein interactions. This study focuses on the impact of mutating the βGln114 residue on the catalytic and allosteric sites of TS. Extensive molecular dynamics simulations were conducted on E(PLP), E(AEX1), E(A-A), and E(C3) forms of TS using the WT, βQ114A, and βQ114N versions. The results show that both the βQ114A and βQ114N mutations increase protein backbone root mean square deviation fluctuations, destabilizing all TS forms. Conformational and hydrogen bond analyses suggest the significance of βGln114 drifting away from cofactor/intermediates and forming hydrogen bonds with water molecules necessary for l-Trp biosynthesis. The βQ114A mutation creates a gap between βAla114 and cofactor/intermediates, hindering hydrogen bond formation due to short side chains and disrupting β-sites. Conversely, the βQ114N mutation positions βAsn114 closer to cofactor/intermediates, forming hydrogen bonds with O3 of cofactors/intermediates and nearby water molecules, potentially disrupting the l-Trp biosynthetic mechanism.
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Affiliation(s)
- Anupom Roy
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A5B7, Canada
| | - Mikko Karttunen
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A5B7, Canada
- Department of Physics and Astronomy, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A3K7, Canada
- The Centre of Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A5B7, Canada
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Winter K, Houle S, Dozois CM, Ward BJ. Multimodal vaccination targeting the receptor binding domains of Clostridioides difficile toxins A and B with an attenuated Salmonella Typhimurium vector (YS1646) protects mice from lethal challenge. Microbiol Spectr 2024; 12:e0310922. [PMID: 38189293 PMCID: PMC10846063 DOI: 10.1128/spectrum.03109-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 12/06/2023] [Indexed: 01/09/2024] Open
Abstract
Developing a vaccine against Clostridioides difficile is a key strategy to protect the elderly. Two candidate vaccines using a traditional approach of intramuscular (IM) delivery of recombinant antigens targeting C. difficile toxins A (TcdA) and B (TcdB) failed to meet their primary endpoints in large phase 3 trials. To elicit a mucosal response against C. difficile, we repurposed an attenuated strain of Salmonella Typhimurium (YS1646) to deliver the receptor binding domains (rbd) of TcdA and TcdB to the gut-associated lymphoid tissues, to elicit a mucosal response against C. difficile. In this study, YS1646 candidates with either rbdA or rbdB expression cassettes integrated into the bacterial chromosome at the attTn7 site were generated and used in a short-course multimodal vaccination strategy that combined oral delivery of the YS1646 candidate(s) on days 0, 2, and 4 and IM delivery of recombinant antigen(s) on day 0. Five weeks after vaccination, mice had high serum IgG titers and increased intestinal antigen-specific IgA titers. Multimodal vaccination increased the IgG avidity compared to the IM-only control. In the mesenteric lymph nodes, we observed increased IL-5 secretion and increased IgA+ plasma cells. Oral vaccination skewed the IgG response toward IgG2c dominance (vs IgG1 dominance in the IM-only group). Both oral alone and multimodal vaccination against TcdA protected mice from lethal C. difficile challenge (100% survival vs 30% in controls). Given the established safety profile of YS1646, we hope to move this vaccine candidate forward into a phase I clinical trial.IMPORTANCEClostridioides difficile remains a major public health threat, and new approaches are needed to develop an effective vaccine. To date, the industry has focused on intramuscular vaccination targeting the C. difficile toxins. Multiple disappointing results in phase III trials have largely confirmed that this may not be the best strategy. As C. difficile is a pathogen that remains in the intestine, we believe that targeting mucosal immune responses in the gut will be a more successful strategy. We have repurposed a highly attenuated Salmonella Typhimurium (YS1646), originally pursued as a cancer therapeutic, as a vaccine vector. Using a multimodal vaccination strategy (both recombinant protein delivered intramuscularly and YS1646 expressing antigen delivered orally), we elicited both systemic and local immune responses. Oral vaccination alone completely protected mice from lethal challenge. Given the established safety profile of YS1646, we hope to move these vaccine candidates forward into a phase I clinical trial.
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Affiliation(s)
- Kaitlin Winter
- Department of Microbiology and Immunology, McGill University, Montreal, Québec, Canada
- Research Institute of the McGill University Health Centre, Montreal, Québec, Canada
| | - Sébastien Houle
- Institut National de Recherche Scientifique–Centre Armand-Frappier Santé Biotechnologie, Laval, Québec, Canada
| | - Charles M. Dozois
- Institut National de Recherche Scientifique–Centre Armand-Frappier Santé Biotechnologie, Laval, Québec, Canada
| | - Brian J. Ward
- Department of Microbiology and Immunology, McGill University, Montreal, Québec, Canada
- Research Institute of the McGill University Health Centre, Montreal, Québec, Canada
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Tang J, Gu Y, Wang X, Luo Y, Zhang F, Zheng J, Wang Y, Shen X, Xu L. Salmonella T3SS-elicited inflammatory innate immune response inhibits type I IFN response in macrophages. Vet Microbiol 2024; 289:109970. [PMID: 38154394 DOI: 10.1016/j.vetmic.2023.109970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 12/08/2023] [Accepted: 12/21/2023] [Indexed: 12/30/2023]
Abstract
As a gram-negative intracellular bacterial pathogen, Salmonella enterica serovar Typhimurium (S. Typhimurium) invades different cell types including macrophages. Its infection in macrophages induces robust innate immune responses that are featured by proinflammatory and type I interferon (IFN) responses. The type III secretion systems (T3SSs) of S. Typhimurium play a crucial role in activating host inflammasome pathways. It has been recognized that the inflammasome pathways inhibit the type I IFN cascade. However, the potential role of T3SS in regulating the type I IFN response and the underlying mechanisms are largely unknown. In this study, we showed that S. Typhimurium infection activated strong proinflammatory, type I IFN and IFN-stimulated genes (ISGs) expression in macrophages. Furthermore, we showed that T3SS-defective S. Typhimurium mutant ΔinvC elicited attenuated inflammatory response but enhanced type I IFN and ISGs expression. Additionally, the inhibition of caspase-1 by a specific inhibitor VX-765 resulted in increased type I IFN response. Moreover, cell-permeable pan-caspase inhibitor Z-VAD-FMK also enhanced the type I IFN response upon S. Typhimurium infection. Intriguingly, compared with exponential phase S. Typhimurium infection, stationary phase bacteria triggered higher levels of type I IFN responses. Finally, the inhibition of caspase-1 by VX-765 substantially increased the intracellular S. Typhimurium burden. In conclusion, we demonstrated that the proinflammatory response induced by S. Typhimurium T3SS can inhibit the type I IFN response, which provides insight into the role of T3SS in orchestrating innate immunity during S. Typhimurium infection.
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Affiliation(s)
- Jingjing Tang
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yanchao Gu
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xiao Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yi Luo
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Fuhua Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jingcai Zheng
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yao Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xihui Shen
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Lei Xu
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China.
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Bullones-Bolaños A, Martín-Muñoz P, Vallejo-Grijalba C, Bernal-Bayard J, Ramos-Morales F. Specificities and redundancies in the NEL family of bacterial E3 ubiquitin ligases of Salmonella enterica serovar Typhimurium. Front Immunol 2024; 15:1328707. [PMID: 38361917 PMCID: PMC10867120 DOI: 10.3389/fimmu.2024.1328707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 01/17/2024] [Indexed: 02/17/2024] Open
Abstract
Salmonella enterica serovar Typhimurium expresses two type III secretion systems, T3SS1 and T3SS2, which are encoded in Salmonella pathogenicity island 1 (SPI1) and SPI2, respectively. These are essential virulent factors that secrete more than 40 effectors that are translocated into host animal cells. This study focuses on three of these effectors, SlrP, SspH1, and SspH2, which are members of the NEL family of E3 ubiquitin ligases. We compared their expression, regulation, and translocation patterns, their role in cell invasion and intracellular proliferation, their ability to interact and ubiquitinate specific host partners, and their effect on cytokine secretion. We found that transcription of the three genes encoding these effectors depends on the virulence regulator PhoP. Although the three effectors have the potential to be secreted through T3SS1 and T3SS2, the secretion of SspH1 and SspH2 is largely restricted to T3SS2 due to their expression pattern. We detected a role for these effectors in proliferation inside fibroblasts that is masked by redundancy. The generation of chimeric proteins allowed us to demonstrate that the N-terminal part of these proteins, containing the leucine-rich repeat motifs, confers specificity towards ubiquitination targets. Furthermore, the polyubiquitination patterns generated were different for each effector, with Lys48 linkages being predominant for SspH1 and SspH2. Finally, our experiments support an anti-inflammatory role for SspH1 and SspH2.
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Affiliation(s)
| | | | | | - Joaquín Bernal-Bayard
- Departamento de Genética, Facultad de Biología, Universidad de Sevilla, Sevilla, Spain
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Tsai S, Tikekar RV. The effect of emulsifier type and oil inclusion on stress-related gene expression of Salmonella typhimurium in oil-in-water emulsion. J Food Sci 2024; 89:1211-1224. [PMID: 38224194 DOI: 10.1111/1750-3841.16908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 11/21/2023] [Accepted: 12/11/2023] [Indexed: 01/16/2024]
Abstract
Salmonella has been associated with numerous outbreaks from contaminated food products, including emulsions. Emulsions are influenced by emulsifier type and oil presence, which can have varying degrees of stress or protection on bacteria. Although our previous research has shown that emulsifier solutions, rather than emulsions, provide a protective effect on Salmonella typhimurium after thermal treatment, the underlying mechanism remains unclear. This study selected S. typhimurium as the model microorganism and utilized the same emulsifiers (Tween 20, Tween 80, Triton X-100) to create emulsifier solutions and emulsions with the same oil fraction (60% (v/v)) to examine their effect on the expression of nine selected genes (rpoE, rpoH, otsB, proV, fadA, fabA, dnaK, ibpA, ompC) associated with stress response. Specifically, the study observed variations in gene expression under normal and thermal stress at 55°C. After 20-h incubation, Triton X-100 emulsion caused an upregulation of stress-related genes, rpoE, otsB, and fabA, suggesting stressful environment. After thermal treatment, S. typhimurium in Triton X-100 solution showed a longer 5-log reduction time with increased proV and decreased fabA and ompC expression, suggesting enhanced thermal protection compared to its emulsion. Conversely, Tween 80 solution increased fabA and ompC expression, indicating greater membrane fluidity and passive diffusion, potentially reducing thermal resistance. However, according to the upregulation of ibpA, this effect was likely mitigated by the overproduction of heat shock proteins. Notably, Triton X-100 environments exhibited the most significant gene expression changes after heat treatment, whereas Tween 80 without oil was the most inhospitable for bacterial survival. These findings inform bacterial responses under various conditions, aiding food safety strategies.
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Affiliation(s)
- Shawn Tsai
- Department of Nutrition and Food Science, University of Maryland, College Park, Maryland, USA
| | - Rohan V Tikekar
- Department of Nutrition and Food Science, University of Maryland, College Park, Maryland, USA
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Olsen JE, Frees D, Kyvsgaard NC, Barco L. Lack of correlation between growth, stress, and virulence phenotypes in strains of Salmonella enterica serovar Enteritidis, S. Typhimurium DT104, S. 4,12, b:- and S. Liverpool. Lett Appl Microbiol 2024; 77:ovae015. [PMID: 38366187 DOI: 10.1093/lambio/ovae015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 01/08/2024] [Accepted: 02/13/2024] [Indexed: 02/18/2024]
Abstract
Strains of Salmonella Enteritidis (SEnt, n = 10) and S. Typhimurium (STm, n = 11), representing clones with high impact on human health, and strains of S. 4,12: b:- (S412B n = 11) and S. Liverpool (SLiv, n = 4), representing clones with minor impact on human health were characterized for 16 growth, stress, and virulence phenotypes to investigate whether systematic differences exist in their performance in these phenotypes and whether there was correlation between performance in different phenotypes. The term serotype was not found to be predictive of a certain type of performance in any phenotype, and surprisingly, on average, strains of SEnt and STm were not significantly better in adhering to and invading cultured intestinal cells than the less pathogenic types. Forest analysis identified desiccation tolerance and the ability to grow at 42°C with high salt as the characters that separated serovars with low human health impact (S412B/SLiv) from serovars with high human health impact (SEnt/STm). The study showed that variation in phenotypes was high even within serovars and correlation between phenotypes was low, i.e. the way that a strain performed phenotypically in one of the tested conditions had a low predictive value for the performance of the strain in other conditions.
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Affiliation(s)
- John Elmerdahl Olsen
- Department of Veterinary and Animal Sciences, University of Copenhagen, 1870 Frederiksberg C., Denmark
| | - Dorte Frees
- Department of Veterinary and Animal Sciences, University of Copenhagen, 1870 Frederiksberg C., Denmark
| | - Niels Christian Kyvsgaard
- Department of Veterinary and Animal Sciences, University of Copenhagen, 1870 Frederiksberg C., Denmark
| | - Lisa Barco
- WOAH, National Reference Laboratory for Salmonella, Istituto Zooprofilattico Sperimentale delle Venezie, 35020, Legnaro, Padova, Italy
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Ning C, Li N, Wang L, Guo Y, Ji C, Li Z, Shang Y, Zhang X, Sun Y, Huang X, Leng Q, Cai X, Meng Q, Qiao J. STnc1280, a trans-coding sRNA is involved in virulence modulation via targeting gldA mRNA in Salmonella Typhimurium. J Med Microbiol 2024; 73. [PMID: 38353511 DOI: 10.1099/jmm.0.001804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024] Open
Abstract
Introduction. Salmonella Typhimurium (STM) is a food-borne Gram-negative bacterium, which can infect humans and a wide range of livestock and poultry, causing a variety of diseases such as septicaemia, enteritis and abortion.Hypothesis/Gap Statement. We will decipher the impacts of sRNA STnc1280 on STM virulence and provide a theoretical basis to reveal the regulatory role and molecular mechanism of STnc1280.Aim. The main objective of this study was to clarify whether sRNA STnc1280 exerts regulatory roles on STM pathogenicity.Methodology. The STnc1280 gene was amplified and its molecular characteristics were analysed in this study. Then, STnc1280 gene deletion strain (STM-ΔSTnc1280) and the complementary strain (ΔSTnc1280/STnc1280) were constructed by λ-Red homologous recombination method, respectively, to analyse of adhesion and invasive ability and pathogenicity of different strains. Subsequently, the potential target gene regulated by STnc1280 was predicted using target RNA2 software, followed by the verification of the interaction between STnc1280 and target mRNA using the dual plasmid reporter system (DPRS). Furthermore, the mRNA and protein level of target gene was determined using qRT-PCR and Western blot, respectively.Results. The results revealed that the cell adhesion and invasive ability and pathogenicity of STM-ΔSTnc1280 were significantly reduced compared to STM-SL1344 strain, indicating that the deficiency of STnc1280 gene significantly influenced STM pathogenicity. The DPRS results showed that STnc1280 can interact with the mRNA of target gene gldA, thus suppressing the expression of lacZ gene. Furthermore, the level of gldA mRNA was not influenced in STM-ΔSTnc1280, but the expression of GldA protein decreased significantly.Conclusion. Combining the bioinformatic analysis, these findings suggested that STnc1280 may bind to the SD sequence of gldA mRNA, hindering the binding of ribosomes to gldA mRNA, thereby inhibiting the expression of GldA protein to modulate the virulence of STM.
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Affiliation(s)
- Chengcheng Ning
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
- College of Animal Science and Technology, Xinjiang Agricultural Vocational and Technical College, Changji, Xinjiang, 831100, PR China
| | - Na Li
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
| | - Lixia Wang
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
| | - Yun Guo
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
| | - Chunhui Ji
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
| | - Zhiyuan Li
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
| | - Yunxia Shang
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
| | - Xingxing Zhang
- Institute of Animal Science and Veterinary Research, Xinjiang Academy of Agricultural and Reclamation Science, Shihezi, Xinjiang, 832000, PR China
| | - Yaoqiang Sun
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
| | - Xiaoxing Huang
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
| | - Qingwen Leng
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
| | - Xuepeng Cai
- State Key Lab of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu, 730046, PR China
| | - Qingling Meng
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
| | - Jun Qiao
- College of Animal Science and Technology, Shihezi University, Shihezi, Xinjiang, 832003, PR China
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von Beek C, Fahlgren A, Geiser P, Di Martino ML, Lindahl O, Prensa GI, Mendez-Enriquez E, Eriksson J, Hallgren J, Fällman M, Pejler G, Sellin ME. A two-step activation mechanism enables mast cells to differentiate their response between extracellular and invasive enterobacterial infection. Nat Commun 2024; 15:904. [PMID: 38291037 PMCID: PMC10828507 DOI: 10.1038/s41467-024-45057-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 01/12/2024] [Indexed: 02/01/2024] Open
Abstract
Mast cells localize to mucosal tissues and contribute to innate immune defense against infection. How mast cells sense, differentiate between, and respond to bacterial pathogens remains a topic of ongoing debate. Using the prototype enteropathogen Salmonella Typhimurium (S.Tm) and other related enterobacteria, here we show that mast cells can regulate their cytokine secretion response to distinguish between extracellular and invasive bacterial infection. Tissue-invasive S.Tm and mast cells colocalize in the mouse gut during acute Salmonella infection. Toll-like Receptor 4 (TLR4) sensing of extracellular S.Tm, or pure lipopolysaccharide, causes a modest induction of cytokine transcripts and proteins, including IL-6, IL-13, and TNF. By contrast, type-III-secretion-system-1 (TTSS-1)-dependent S.Tm invasion of both mouse and human mast cells triggers rapid and potent inflammatory gene expression and >100-fold elevated cytokine secretion. The S.Tm TTSS-1 effectors SopB, SopE, and SopE2 here elicit a second activation signal, including Akt phosphorylation downstream of effector translocation, which combines with TLR activation to drive the full-blown mast cell response. Supernatants from S.Tm-infected mast cells boost macrophage survival and maturation from bone-marrow progenitors. Taken together, this study shows that mast cells can differentiate between extracellular and host-cell invasive enterobacteria via a two-step activation mechanism and tune their inflammatory output accordingly.
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Affiliation(s)
- Christopher von Beek
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Anna Fahlgren
- Department of Molecular Biology, Laboratory for Molecular Infection Medicine Sweden (MIMS), Umeå Centre for Microbial Research (UCMR), Umeå University, Umeå, Sweden
| | - Petra Geiser
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | | | - Otto Lindahl
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Grisna I Prensa
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Erika Mendez-Enriquez
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Jens Eriksson
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Jenny Hallgren
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Maria Fällman
- Department of Molecular Biology, Laboratory for Molecular Infection Medicine Sweden (MIMS), Umeå Centre for Microbial Research (UCMR), Umeå University, Umeå, Sweden
| | - Gunnar Pejler
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden.
| | - Mikael E Sellin
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden.
- Science for Life Laboratory, Uppsala, Sweden.
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Kamijo T, Horiuchi K, Negishi T, Natori T, Yamane T, Hachiro A, Uehara T, Hayashi W, Nagano N. First Detection of Chimeric β-Lactamase CTX-M-64-Producing Salmonella Typhimurium from a Domestic Source in Japan. Jpn J Infect Dis 2024; 77:47-50. [PMID: 37648488 DOI: 10.7883/yoken.jjid.2023.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Salmonella enterica subsp. enterica serovar Typhimurium has recently emerged worldwide as a producer of extended-spectrum β-lactamase (ESBL). However, drug-resistant clinical isolates are rare in Japan. The common types of ESBLs found are the CTX-M-type β-lactamases, including novel β-lactamases such as CTX-M-64. CTX-M-64 has a chimeric structure comprising a combination of the CTX-M-1 and CTX-M-9 groups. In 2017, S. Typhimurium was isolated from stool, blood, and urine cultures of an 82-year-old man. Herein, we describe the discovery of a clinical isolate of S. Typhimurium in Japan. Antimicrobial susceptibility testing revealed that the isolate was resistant to third- and fourth-generation cephalosporins, including ceftazidime and monobactam. The minimum inhibitory concentrations of ceftazidime and ceftriaxone were restored by administration of clavulanic acid. Whole-genome sequencing analysis revealed that the isolate harbored the blaCTX-M-64 gene on an IncHI2/IncHI2A-type plasmid, with an assembly length of 174,477 bp. The genetic structure of the region surrounding the blaCTX-M-64 gene, ISKpn26-ΔISEcp1-blaCTX-M-64-orf477, was shared only with the chromosome sequence of S. Typhimurium detected in food-producing chickens in Guangdong, China. Although rare, S. Typhimurium can induce bloodstream infections and produce ESBL. To our knowledge, this is the first report of a CTX-M-64-producing Enterobacterales clinical isolate of domestic origin in Japan.
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Affiliation(s)
- Tomu Kamijo
- Department of Laboratory Medicine, Shinshu University Hospital, Japan
- Department of Medical Sciences, Graduate School of Medicine, Science and Technology, Shinshu University, Japan
| | - Kazuki Horiuchi
- Department of Laboratory Medicine, Shinshu University Hospital, Japan
| | - Tatsuya Negishi
- Department of Laboratory Medicine, Shinshu University Hospital, Japan
| | - Tatsuya Natori
- Department of Laboratory Medicine, Shinshu University Hospital, Japan
| | - Taku Yamane
- Department of Laboratory Medicine, Shinshu University Hospital, Japan
- Department of Medical Sciences, Graduate School of Medicine, Science and Technology, Shinshu University, Japan
| | - Ayaka Hachiro
- Department of Laboratory Medicine, Shinshu University Hospital, Japan
| | - Takeshi Uehara
- Department of Laboratory Medicine, Shinshu University Hospital, Japan
| | - Wataru Hayashi
- Antimicrobial Resistance Research Center, National Institute of Infectious Diseases, Japan
| | - Noriyuki Nagano
- Department of Health and Medical Science, Graduate School of Medicine, Shinshu University, Japan
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35
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Liu K, Li Z, Li Q, Wang S, Curtiss R, Shi H. Salmonella typhimurium Vaccine Candidate Delivering Infectious Bronchitis Virus S1 Protein to Induce Protection. Biomolecules 2024; 14:133. [PMID: 38275762 PMCID: PMC10813627 DOI: 10.3390/biom14010133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/18/2024] [Accepted: 01/18/2024] [Indexed: 01/27/2024] Open
Abstract
Infectious bronchitis (IB) is a highly infectious viral disease of chickens which causes significant economic losses in the poultry industry worldwide. An effective vaccine against IB is urgently needed to provide both biosafety and high-efficiency immune protection. In this study, the S1 protein of the infectious bronchitis virus was delivered by a recombinant attenuated Salmonella typhimurium vector to form the vaccine candidate χ11246(pYA4545-S1). S. typhimurium χ11246 carried a sifA- mutation with regulated delayed systems, striking a balance between host safety and immunogenicity. Here, we demonstrated that S1 protein is highly expressed in HD11 cells. Immunization with χ11246(pYA4545-S1) induced the production of antibody and cytokine, leading to an effective immune response against IB. Oral immunization with χ11246(pYA4545-S1) provided 72%, 56%, and 56% protection in the lacrimal gland, trachea, and cloaca against infectious bronchitis virus infection, respectively. Furthermore, it significantly reduced histopathological lesions in chickens. Together, this study provides a new idea for the prevention of IB.
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Affiliation(s)
- Kaihui Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; (K.L.); (Z.L.); (Q.L.)
- Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Zewei Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; (K.L.); (Z.L.); (Q.L.)
- Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Quan Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; (K.L.); (Z.L.); (Q.L.)
- Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Shifeng Wang
- Department of Infectious Diseases and Immunology, College of Veterinary Medicine, University of Florida, Gainesville, FL 32611, USA; (S.W.)
| | - Roy Curtiss
- Department of Infectious Diseases and Immunology, College of Veterinary Medicine, University of Florida, Gainesville, FL 32611, USA; (S.W.)
| | - Huoying Shi
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; (K.L.); (Z.L.); (Q.L.)
- Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou University (JIRLAAPS), Yangzhou 225009, China
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Guo J, Brassard D, Adam N, Verster AJ, Shay JA, Miville-Godin C, Janta-Polczynski M, Ferreira J, Mounier M, Pilar AV, Tapp K, Classen A, Shiu M, Charlebois D, Petronella N, Weedmark K, Corneau N, Veres T. Automated centrifugal microfluidic system for the preparation of adaptor-ligated sequencing libraries. Lab Chip 2024; 24:182-196. [PMID: 38044704 DOI: 10.1039/d3lc00781b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
The intensive workload associated with the preparation of high-quality DNA libraries remains a key obstacle toward widespread deployment of sequencing technologies in remote and resource-limited areas. We describe the development of single-use microfluidic devices driven by an advanced pneumatic centrifugal microfluidic platform, the PowerBlade, to automate the preparation of Illumina-compatible libraries based on adaptor ligation methodology. The developed on-chip workflow includes enzymatic DNA fragmentation coupled to end-repair, adaptor ligation, first DNA cleanup, PCR amplification, and second DNA cleanup. This complex workflow was successfully integrated into simple thermoplastic microfluidic devices that are amenable to mass production with injection molding. The system was validated by preparing, on chip, libraries from a mixture of genomic DNA extracted from three common foodborne pathogens (Listeria monocytogenes, Escherichia coli and Salmonella enterica serovar Typhimurium) and comparing them with libraries made via a manual procedure. The two types of libraries were found to exhibit similar quality control metrics (including genome coverage, assembly, and relative abundances) and led to nearly uniform coverage independent of GC content. This microfluidic technology offers a time-saving and cost-effective alternative to manual procedures and robotic-based automation, making it suitable for deployment in remote environments where technical expertise and resources might be scarce. Specifically, it facilitates field practices that involve mid- to low-throughput sequencing, such as tasks related to foodborne pathogen detection, characterization, and microbial profiling.
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Affiliation(s)
- Jimin Guo
- Medical Devices Research Center, Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, QC, J4B 6Y4, Canada.
| | - Daniel Brassard
- Medical Devices Research Center, Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, QC, J4B 6Y4, Canada.
| | - Nadine Adam
- Bureau of Microbial Hazards, Microbiology Research Division, Health Canada, 251 Sir Frederick Banting Driveway, Ottawa, ON, K1A 0K9, Canada.
| | - Adrian J Verster
- Bureau of Food Surveillance and Science Integration, Bioinformatics High-Capacity Computing Laboratory, Health Canada, 251 Sir Frederick Banting Driveway, Ottawa, ON, K1A 0K9, Canada
| | - Julie A Shay
- Bureau of Food Surveillance and Science Integration, Bioinformatics High-Capacity Computing Laboratory, Health Canada, 251 Sir Frederick Banting Driveway, Ottawa, ON, K1A 0K9, Canada
| | - Caroline Miville-Godin
- Medical Devices Research Center, Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, QC, J4B 6Y4, Canada.
| | - Mojra Janta-Polczynski
- Medical Devices Research Center, Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, QC, J4B 6Y4, Canada.
| | - Jason Ferreira
- Medical Devices Research Center, Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, QC, J4B 6Y4, Canada.
| | - Maxence Mounier
- Medical Devices Research Center, Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, QC, J4B 6Y4, Canada.
| | - Ana V Pilar
- Bureau of Microbial Hazards, Microbiology Research Division, Health Canada, 251 Sir Frederick Banting Driveway, Ottawa, ON, K1A 0K9, Canada.
| | - Kyle Tapp
- Bureau of Microbial Hazards, Microbiology Research Division, Health Canada, 251 Sir Frederick Banting Driveway, Ottawa, ON, K1A 0K9, Canada.
| | - Adam Classen
- Bureau of Microbial Hazards, Microbiology Research Division, Health Canada, 251 Sir Frederick Banting Driveway, Ottawa, ON, K1A 0K9, Canada.
| | - Matthew Shiu
- Medical Devices Research Center, Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, QC, J4B 6Y4, Canada.
| | - Denis Charlebois
- Canadian Space Agency, 6767 Route de l'Aéroport, Saint-Hubert, QC J3Y 8Y9, Canada
| | - Nicholas Petronella
- Bureau of Food Surveillance and Science Integration, Bioinformatics High-Capacity Computing Laboratory, Health Canada, 251 Sir Frederick Banting Driveway, Ottawa, ON, K1A 0K9, Canada
| | - Kelly Weedmark
- Bureau of Microbial Hazards, Microbiology Research Division, Health Canada, 251 Sir Frederick Banting Driveway, Ottawa, ON, K1A 0K9, Canada.
| | - Nathalie Corneau
- Bureau of Microbial Hazards, Microbiology Research Division, Health Canada, 251 Sir Frederick Banting Driveway, Ottawa, ON, K1A 0K9, Canada.
| | - Teodor Veres
- Medical Devices Research Center, Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, QC, J4B 6Y4, Canada.
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Li S, Liu H, Shu J, Li Q, Liu Y, Feng H, Wang J, Deng X, Zhang Y, Guo Z, Qiu J. Fisetin inhibits Salmonella Typhimurium type III secretion system regulator HilD and reduces pathology in vivo. Microbiol Spectr 2024; 12:e0240623. [PMID: 38078719 PMCID: PMC10783070 DOI: 10.1128/spectrum.02406-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 11/14/2023] [Indexed: 01/13/2024] Open
Abstract
IMPORTANCE Salmonella spp. remains a major worldwide health concern that causes significant morbidity and mortality in both humans and animals. The spread of antimicrobial resistant strains has declined the efficacy of conventional chemotherapy. Thus, novel anti-infection drugs or strategies are needed. Anti-virulence strategy represents one of the promising means for the treatment of bacterial infections. In this study, we found that the natural compound fisetin could inhibit Salmonella invasion of host cells by targeting SPI-1 regulation. Fisetin treatment impaired the interaction of the regulatory protein HilD with the promoters of its target genes, thereby suppressing the expression of T3SS-1 effectors as well as structural proteins. Moreover, fisetin treatment could reduce pathology in the Salmonella murine infection model. Collectively, our results suggest that fisetin may serve as a promising lead compound for the development of anti-Salmonella drugs.
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Affiliation(s)
- Siqi Li
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Center for Pathogen Biology and Infectious Diseases, The First Hospital of Jilin University , Changchun, Jilin, China
| | - Hongtao Liu
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Center for Pathogen Biology and Infectious Diseases, The First Hospital of Jilin University , Changchun, Jilin, China
| | - Jingyan Shu
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Center for Pathogen Biology and Infectious Diseases, The First Hospital of Jilin University , Changchun, Jilin, China
| | - Quanshun Li
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun, China
| | - Yuan Liu
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Institute of Comparative Medicine, College of Veterinary Medicine, Yangzhou University, Yangzhou, China
| | - Haihua Feng
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Center for Pathogen Biology and Infectious Diseases, The First Hospital of Jilin University , Changchun, Jilin, China
| | - Jianfeng Wang
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Center for Pathogen Biology and Infectious Diseases, The First Hospital of Jilin University , Changchun, Jilin, China
| | - Xuming Deng
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Center for Pathogen Biology and Infectious Diseases, The First Hospital of Jilin University , Changchun, Jilin, China
| | - Yong Zhang
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Center for Pathogen Biology and Infectious Diseases, The First Hospital of Jilin University , Changchun, Jilin, China
| | - Zhimin Guo
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Center for Pathogen Biology and Infectious Diseases, The First Hospital of Jilin University , Changchun, Jilin, China
| | - Jiazhang Qiu
- State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Key Laboratory for Zoonosis Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Center for Pathogen Biology and Infectious Diseases, The First Hospital of Jilin University , Changchun, Jilin, China
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Felsl A, Brokatzky D, Kröger C, Heermann R, Fuchs TM. Hierarchic regulation of a metabolic pathway: H-NS, CRP, and SsrB control myo-inositol utilization by Salmonella enterica. Microbiol Spectr 2024; 12:e0272423. [PMID: 38095474 PMCID: PMC10783015 DOI: 10.1128/spectrum.02724-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 11/07/2023] [Indexed: 01/13/2024] Open
Abstract
IMPORTANCE The capacity to utilize myo-inositol (MI) as sole carbon and energy source is widespread among bacteria, among them the intestinal pathogen S. Typhimurium. This study elucidates the complex and hierarchical regulation that underlies the utilization of MI by S. Typhimurium under substrate limitation. A total of seven regulatory factors have been identified so far, allowing the pathogen an environment-dependent, efficient, and fine-tuned regulation of a metabolic property that provides growth advantages in different environments.
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Affiliation(s)
- Angela Felsl
- Lehrstuhl für Mikrobielle Ökologie, ZIEL-Institute for Food and Health, School of Life Science, Technische Universität München, Freising, Germany
| | - Dominik Brokatzky
- Lehrstuhl für Mikrobielle Ökologie, ZIEL-Institute for Food and Health, School of Life Science, Technische Universität München, Freising, Germany
| | - Carsten Kröger
- Department of Microbiology, School of Genetics and Microbiology, Moyne Institute of Preventive Medicine, Trinity College Dublin, University of Dublin, Dublin, Ireland
| | - Ralf Heermann
- Johannes Gutenberg University Mainz, Institute of Molecular Physiology (imP), Biocenter II, Microbiology and Biotechnology, Mainz, Germany
| | - Thilo M. Fuchs
- Lehrstuhl für Mikrobielle Ökologie, ZIEL-Institute for Food and Health, School of Life Science, Technische Universität München, Freising, Germany
- Friedrich-Loeffler-Institut, Institute of Molecular Pathogenesis, Jena, Germany
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Park HJ, Jeong HW, Lee C, Lee MR, Choi H, Kim E, Bang IS. Val43 residue of NsrR is crucial for the nitric oxide response of Salmonella Typhimurium. Microbiol Spectr 2024; 12:e0302423. [PMID: 38054720 PMCID: PMC10783083 DOI: 10.1128/spectrum.03024-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 10/30/2023] [Indexed: 12/07/2023] Open
Abstract
ABSTRACT In pathogenic bacteria, the flavohemoglobin Hmp is crucial in metabolizing the cytotoxic levels of nitric oxide (NO) produced in phagocytic cells, contributing to bacterial virulence. Hmp expression is predominantly regulated by the Rrf2 family transcription repressor NsrR in an NO-dependent manner; however, the underlying molecular mechanism in enterobacteria remains poorly understood. In this study, we identified Val43 of Salmonella Typhimurium NsrR (StNsrR) as a critical amino acid residue for regulating Hmp expression. The Val43-to-Ala-substituted mutant NsrR isolated through random and site-directed mutagenesis showed high binding affinity to the target DNA irrespective of NO exposure, resulting in a severe reduction in hmp transcription and slow NO metabolism in Salmonella under NO-producing conditions. Conversely, the Val43-to-Glu-substituted NsrR caused effects similar to nsrR null mutation, which directed hmp transcription and NO metabolism in a constitutive way. Comparative analysis of the primary sequences of NsrR and another NO-sensing Rrf2 family regulator, IscR, from diverse bacteria, revealed that Val43 of enterobacterial NsrR corresponds to Ala in Pseudomonas aeruginosa or Streptomyces coelicolor NsrR and Glu in enterobacterial IscR, all of which are located in the DNA recognition helix α3. The predicted structure of StNsrR in complex with the hmp DNA suggests dissimilar spatial stoichiometry in the interactions of Val43 and its substituted residues with the target DNA, consistent with the observed phenotypic changes in StNsrR Val43 mutants. Our findings highlight the discriminative roles of the NsrR recognition helix in regulating species-specific target gene expression, facilitating effective NO detoxification strategies in bacteria across diverse environments. IMPORTANCE The precise regulation of flavohemoglobin Hmp expression by NsrR is critical for bacterial fitness, as excessive Hmp expression in the absence of NO can disturb bacterial redox homeostasis. While the molecular structure of Streptomyces coelicolor NsrR has been recently identified, the specific molecular structures of NsrR proteins in enterobacteria remain unknown. Our discovery of the crucial role of Val43 in the DNA recognition helix α3 of Salmonella NsrR offers valuable insights into the Hmp modulation under NO stress. Furthermore, the observed amino acid polymorphisms in the α3 helices of NsrR proteins across different bacterial species suggest the diverse evolution of NsrR structure and gene regulation in response to varying levels of NO pressure within their ecological niches.
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Affiliation(s)
- Hee Jeong Park
- Department of Microbiology and Immunology, Chosun University School of Dentistry, Gwangju, Republic of Korea
| | - Hye Won Jeong
- Department of Microbiology and Immunology, Chosun University School of Dentistry, Gwangju, Republic of Korea
| | - Choa Lee
- Department of Microbiology and Immunology, Chosun University School of Dentistry, Gwangju, Republic of Korea
| | - Mi Rae Lee
- Department of Microbiology and Immunology, Chosun University School of Dentistry, Gwangju, Republic of Korea
| | - Hojung Choi
- Department of Biological Sciences, College of Natural Sciences, Chonnam National University, Gwangju, Republic of Korea
| | - Eungseok Kim
- Department of Biological Sciences, College of Natural Sciences, Chonnam National University, Gwangju, Republic of Korea
| | - Iel Soo Bang
- Department of Microbiology and Immunology, Chosun University School of Dentistry, Gwangju, Republic of Korea
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40
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Yuan J, Wang L, Huang L, He K, Wang H, Xu X, Su B, Wang J. CRISPR-Cas12a-Mediated Hue-Recognition Lateral Flow Assay for Point-of-Need Detection of Salmonella. Anal Chem 2024; 96:220-228. [PMID: 38109169 DOI: 10.1021/acs.analchem.3c03753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
Nucleic acid detection of pathogens in a point-of-need (PON) manner is of great significance yet remains challenging for sensitive and accurate visual discrimination. Here, we report a CRISPR-Cas12a-mediated lateral flow assay for PON detection of Salmonella typhimurium (S.ty) that is a prevailing pathogen disseminated through tainted food. The variation of the fluorescence color of the test line is exploited to interpret the results, enabling the discrimination between positive and negative samples on the basis of a hue-recognition mechanism. By leveraging the cleavage activity of Cas12a and hue-recognition readout, the assay facilitated by recombinase polymerase amplification can yield a visual detection limit of 1 copy μL-1 for S.ty genomic DNA within 1 h. The assay also displays a high specificity toward S.ty in fresh chicken samples, as well as a sensitivity 10-fold better than that of the commercial test strip. Moreover, a semiquantitative detection of S.ty ranging from 0 to 4 × 103 CFU/mL by the naked eye is made possible, thanks to the easily discernible color change of the test line. This approach provides an easy, rapid, accurate, and user-friendly solution for the PON detection of Salmonella and other pathogens.
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Affiliation(s)
- Jingrui Yuan
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products; Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture and Rural Affairs; Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, P.R. China
| | - Liu Wang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products; Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture and Rural Affairs; Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, P.R. China
| | - Liang Huang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Kaiyu He
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products; Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture and Rural Affairs; Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, P.R. China
| | - Hongmei Wang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products; Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture and Rural Affairs; Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, P.R. China
| | - Xiahong Xu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products; Key Laboratory of Information Traceability for Agricultural Products, Ministry of Agriculture and Rural Affairs; Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, P.R. China
| | - Bin Su
- Institute of Analytical Chemistry, Department of Chemistry, Zhejiang University, Hangzhou 310058, P.R. China
| | - Jing Wang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
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Naz F, Ahmad A, Sarwar Y, Khan MM, Schierack P, Rauf W, Ali A. Characterization of Salmonella enterica Biofilms and Antibiofilm Effect of Carvacrol and 2-Aminobenzimidazole. Foodborne Pathog Dis 2024; 21:52-60. [PMID: 37819687 DOI: 10.1089/fpd.2023.0044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023] Open
Abstract
Biofilm-associated foodborne Salmonella infections in poultry have become increasingly challenging for veterinarians, particularly in developing countries, and warrant thorough investigation. We assessed the biofilm-forming tendency of poultry isolates of Salmonella enterica, namely Salmonella Typhimurium (n = 23), Salmonella Infantis (n = 28), and Salmonella Heidelberg (n = 18), in nutrient-rich Rappaport-Vassiliadis Soya (RVS) peptone broth and nutrient-deficient diluted Tryptone Soya Broth (TSB). Seven of the tested isolates exhibited moderate biofilm formation in diluted TSB, whereas two showed such formation in RVS. In addition, the Congo red agar assay revealed curli and cellulose production in seven isolates. Fourteen specific biofilm-associated genes were analyzed identifying sdiA and seqA to be the most prevalent (100%), and glyA the least prevalent (69.5%). The prevalence of the genes bcsA and csgA was significantly lower in moderate and weak biofilm formers, respectively, as compared with nonbiofilm formers in RVS peptone broth. Furthermore, the compounds carvacrol and 2-aminobenzimidazole (2-ABI) effectively inhibited biofilm formation by Salmonella serovars in RVS peptone and TSB media, respectively. Whereas the antibiofilm activity of 2-ABI against Salmonella has not been reported previously, we determined its most effective concentration at 1.5 mM among tested antibiofilm treatments. These findings indicate that Salmonella strains prevalent in poultry farms have the potential to form biofilms, and the tested compounds should be further explored as supportive or alternative antimicrobials.
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Affiliation(s)
- Fizza Naz
- Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Abrar Ahmad
- Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Yasra Sarwar
- Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Muhammad Moman Khan
- Faculty Environment and Natural Sciences, Institute of Biotechnology, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany
| | - Peter Schierack
- Faculty Environment and Natural Sciences, Institute of Biotechnology, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany
- Faculty of Health Sciences, Joint Faculty of the Brandenburg University of Technology Cottbus-Senftenberg, the Brandenburg Medical School Theodor Fontane and the University of Potsdam, Potsdam, Germany
| | - Waqar Rauf
- Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
| | - Aamir Ali
- Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Pakistan
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42
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Duan M, Li B, He Y, Zhao Y, Liu Y, Zou B, Liu Y, Chen J, Dai R, Li X, Jia F. A CG@MXene nanocomposite-driven E-CRISPR biosensor for the rapid and sensitive detection of Salmonella Typhimurium in food. Talanta 2024; 266:125011. [PMID: 37544254 DOI: 10.1016/j.talanta.2023.125011] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 07/19/2023] [Accepted: 07/28/2023] [Indexed: 08/08/2023]
Abstract
In this study, we developed a novel electrochemical biosensor based on CRISPR/Cas12a (E-CRISPR) for the rapid and sensitive detection of Salmonella Typhimurium (S. Typhimurium). The CRISPR/Cas12a system was applied to identify S. Typhimurium gene and induce signal changes in electrochemical measurement. The colloidal gold and MXene (CG@MXene) nanocomposites were synthesized and immobilized to improve the performance of the biosensor by decreasing the background noise. The formation process of CG@MXene was well characterized, and experiment conditions were fully optimized. Under the optimal conditions, the proposed E-CRISPR biosensor exhibited excellent sensitivity for S. Typhimurium, with a limit of detection (LOD) of 160 CFU/mL, and great specificity against other common foodborne pathogens. Furthermore, the feasibility of the E-CRISPR biosensor was evaluated by analyzing S. Typhimurium-spiked chicken samples, with a recovery rate ranging from 100.46% to 106.37%. In summary, this research proposed a novel E-CRISPR biosensor from a new perspective to detect S. Typhimurium which can be an alternative approach for bacterial detection in the food supply chain.
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Affiliation(s)
- Miaolin Duan
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Bingyan Li
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Yawen He
- Department of Biological Systems Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Yijie Zhao
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Yana Liu
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Bo Zou
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Yi Liu
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Juhong Chen
- Department of Biological Systems Engineering, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Ruitong Dai
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Xingmin Li
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Fei Jia
- Department of Biological and Agricultural Engineering, University of Arkansas, Fayetteville, AR, 72701, USA.
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43
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Gaviria-Cantin T, Fernández-Coll L, Vargas AF, Jiménez CJ, Madrid C, Balsalobre C. Expression of accessory genes in Salmonella requires the presence of the Gre factors. Genomics 2024; 116:110777. [PMID: 38163572 DOI: 10.1016/j.ygeno.2023.110777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 12/13/2023] [Accepted: 12/29/2023] [Indexed: 01/03/2024]
Abstract
Genomic studies with Salmonella enterica serovar Typhimurium reveal a crucial role of horizontal gene transfer (HGT) in the acquisition of accessory cellular functions involved in host-interaction. Many virulence genes are located in genomic islands, plasmids and prophages. GreA and GreB proteins, Gre factors, interact transiently with the RNA polymerase alleviating backtracked complexes during transcription elongation. The overall effect of Gre factors depletion in Salmonella expression profile was studied. Both proteins are functionally redundant since only when both Gre factors were depleted a major effect in gene expression was detected. Remarkably, the accessory gene pool is particularly sensitive to the lack of Gre factors, with 18.6% of accessory genes stimulated by the Gre factors versus 4.4% of core genome genes. Gre factors involvement is particularly relevant for the expression of genes located in genomic islands. Our data reveal that Gre factors are required for the expression of accessory genes.
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Affiliation(s)
- Tania Gaviria-Cantin
- Department of Genetics, Microbiology and Statistics, School of Biology, Universitat de Barcelona, Avda. Diagonal 643, Barcelona 08028, Spain
| | - Llorenç Fernández-Coll
- Department of Genetics, Microbiology and Statistics, School of Biology, Universitat de Barcelona, Avda. Diagonal 643, Barcelona 08028, Spain
| | - Andrés Felipe Vargas
- Department of Genetics, Microbiology and Statistics, School of Biology, Universitat de Barcelona, Avda. Diagonal 643, Barcelona 08028, Spain
| | - Carlos Jonay Jiménez
- Department of Genetics, Microbiology and Statistics, School of Biology, Universitat de Barcelona, Avda. Diagonal 643, Barcelona 08028, Spain
| | - Cristina Madrid
- Department of Genetics, Microbiology and Statistics, School of Biology, Universitat de Barcelona, Avda. Diagonal 643, Barcelona 08028, Spain
| | - Carlos Balsalobre
- Department of Genetics, Microbiology and Statistics, School of Biology, Universitat de Barcelona, Avda. Diagonal 643, Barcelona 08028, Spain.
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Spiliotopoulos D, Koelbert C, Audebert M, Barisch I, Bellet D, Constans M, Czich A, Finot F, Gervais V, Khoury L, Kirchnawy C, Kitamoto S, Le Tesson A, Malesic L, Matsuyama R, Mayrhofer E, Mouche I, Preikschat B, Prielinger L, Rainer B, Roblin C, Wäse K. Assessment of the performance of the Ames MPF™ assay: A multicenter collaborative study with six coded chemicals. Mutat Res Genet Toxicol Environ Mutagen 2024; 893:503718. [PMID: 38272629 DOI: 10.1016/j.mrgentox.2023.503718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 11/06/2023] [Accepted: 11/19/2023] [Indexed: 01/27/2024]
Abstract
The Ames MPF™ is a miniaturized, microplate fluctuation format of the Ames test. It is a standardized, commercially available product which can be used to assess mutagenicity in Salmonella and E. coli strains in 384-well plates using a color change-based readout. Several peer-reviewed comparisons of the Ames MPF™ to the Ames test in Petri dishes confirmed its suitability to evaluate the mutagenic potential of a variety of test items. An international multicenter study involving seven laboratories tested six coded chemicals with this assay using five bacterial strains, as recommended by the OECD test guideline 471. The data generated by the participating laboratories was in excellent agreement (93%), and the similarity of their dose response curves, as analyzed with sophisticated statistical approaches further confirmed the suitability of the Ames MPF™ assay as an alternative to the Ames test on agar plates, but with advantages with respect to significantly reduced amount of test substance and S9 requirements, speed, hands-on time and, potentially automation.
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Affiliation(s)
| | | | - Marc Audebert
- PrediTox, 1 place Pierre Potier, 31100 Toulouse, France; INRAE UMR1331 Toxalim, 180 chemin de Tournefeuille, 31300 Toulouse, France
| | - Ilona Barisch
- Genetic Toxicology, Preclinical Safety, Sanofi-Aventis Deutschland GmbH, 65926 Frankfurt am Main, Germany
| | - Deborah Bellet
- GenEvolutioN, 2, 8 Rue de Rouen, 78440 Porcheville, France
| | | | - Andreas Czich
- Genetic Toxicology, Preclinical Safety, Sanofi-Aventis Deutschland GmbH, 65926 Frankfurt am Main, Germany
| | - Francis Finot
- GenEvolutioN, 2, 8 Rue de Rouen, 78440 Porcheville, France
| | - Véronique Gervais
- Servier Group, Non-Clinical Safety Department, F-45403 Orléans-Gidy, France
| | - Laure Khoury
- PrediTox, 1 place Pierre Potier, 31100 Toulouse, France
| | - Christian Kirchnawy
- OFI, Austrian Research Institute for Chemistry and Technology, Department for Microbiology and Cell Culture, Franz-Grill Straße 5, Objekt 213, 1030 Vienna, Austria
| | - Sachiko Kitamoto
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 1-98, Kasugadenaka 3-chome, konohana-ku, Osaka, Japan
| | - Audrey Le Tesson
- Servier Group, Non-Clinical Safety Department, F-45403 Orléans-Gidy, France
| | - Laure Malesic
- GenEvolutioN, 2, 8 Rue de Rouen, 78440 Porcheville, France
| | - Ryoko Matsuyama
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 1-98, Kasugadenaka 3-chome, konohana-ku, Osaka, Japan
| | - Elisa Mayrhofer
- OFI, Austrian Research Institute for Chemistry and Technology, Department for Microbiology and Cell Culture, Franz-Grill Straße 5, Objekt 213, 1030 Vienna, Austria
| | | | - Birgit Preikschat
- Genetic Toxicology, Preclinical Safety, Sanofi-Aventis Deutschland GmbH, 65926 Frankfurt am Main, Germany
| | - Lukas Prielinger
- Department of Applied Life Sciences, University of Applied Sciences, FH Campus Wien, Favoritenstraße 222, 1100 Vienna, Austria
| | - Bernhard Rainer
- Department of Applied Life Sciences, University of Applied Sciences, FH Campus Wien, Favoritenstraße 222, 1100 Vienna, Austria
| | - Clémence Roblin
- Servier Group, Non-Clinical Safety Department, F-45403 Orléans-Gidy, France
| | - Kerstin Wäse
- Genetic Toxicology, Preclinical Safety, Sanofi-Aventis Deutschland GmbH, 65926 Frankfurt am Main, Germany
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Koczerka M, Lantier I, Morillon M, Deperne J, Clamagirand CD, Virlogeux-Payant I, Grépinet O. From intestine to beyond: Salmonella entry factors display distinct transcription pattern upon infection in murine models. Open Biol 2024; 14:230312. [PMID: 38228171 DOI: 10.1098/rsob.230312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 12/14/2023] [Indexed: 01/18/2024] Open
Abstract
The infectious process of bacteria of the genus Salmonella requires the finely regulated use of various virulence factors. Among them, the type 3 secretion system-1 (T3SS-1) and the Rck and PagN invasins are involved in the internalization of the pathogen within eukaryotic cells, but their precise role in the host and in the pathogenic process is still poorly understood. In this study, we aimed to determine the kinetics of expression of these entry factors in a typhoid fever-like and a gastroenteritis model in mice by in vivo imaging using bioluminescent Salmonella Typhimurium reporter strains carrying chromosomal transcriptional fusions. Only pagN and T3SS-1 transcription has been clearly identified. Independently of the pathological model, the caecum was identified as the main transcription site of both pagN and the T3SS-1-encoding gene both at early and late stages of the infection. An intense transcription of pagN was also observed in deep organs in the typhoid fever-like model, while that of T3SS-1 remained quite sporadic in these organs, and mainly focused on the intestine all along the infection. This work will help to understand the respective role of these entry factors at the cellular level in the pathogenesis of Salmonella in vivo.
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Affiliation(s)
| | | | - Marie Morillon
- INRAE, Université de Tours, ISP, 37380, Nouzilly, France
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Elbarbary NK, Abdelmotilib NM, Salem-Bekhit MM, Salem MM, Singh S, Dandrawy MK. Antibacterial efficiency of apple vinegar marination on beef-borne Salmonella. Open Vet J 2024; 14:274-283. [PMID: 38633164 PMCID: PMC11018434 DOI: 10.5455/ovj.2024.v14.i1.24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Accepted: 12/15/2023] [Indexed: 04/19/2024] Open
Abstract
Background Salmonella-related foodborne illnesses are a significant public health concern. Naturally, antibacterial food components have been shown to limit microbial growth proliferation with various degrees of efficacy. Aims To examine the occurrence, microbial load, and effect of apple vinegar on Salmonella serovars in beef and beef products. Methods 150 beef and beef products were collected between March and May 2022. Total viable count (TVC), Enterobacteriaceae count (ENT), isolation and identification of Salmonella, and their virulence factors detection by multiplex PCR were determined, and an experimental study of the effect of natural apple vinegar marination on Salmonella spp. Results TVC was higher in meatballs (3.32 × 106 ± 1.07 × 106) while beef burgers (4.22 × 103 ± 0.71 × 103) had the highest ENT. Concerning the prevalence of Salmonella spp., meatball (46.7%) and beef burger (25.3%) samples were the highest contamination rate. The common serovars detected were Salmonella typhimurium (6%), Salmonella enteritidis (6%), and Salmonella infantis (4%). Based on the results of PCR, 12, 11, and 11 out of 18 samples of Salmonella isolates possess hila, stn, and invA genes. By immersing the inoculated steak meat in apple vinegar at different concentrations (50%, 70%, and 100%), the initial populations of the Salmonella strains after 12 hours were reduced to 0.38 × 102 ± 0.05 × 102 log CFU/ml; however, after 48 hours become the most reduction (0.31 × 102 ± 0.07 × 102 log CFU/ml) at a concentration of 100% apple vinegar. An enhancement in the sensory attributes was noted across all concentrations. Conclusion The consumed beef and beef products are contaminated with pathogenic bacteria such as Salmonella spp. Marinades made using apple vinegar concentrations of 50%, 75%, and 100% effectively minimized the prevalence of artificially inoculated Salmonella and extended the shelf life of preserved refrigerated beef products to 48 hours.
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Affiliation(s)
- Nady Khairy Elbarbary
- Food Hygiene and Control Department, Faculty of Veterinary Medicine, Aswan University, Aswan, Egypt
| | - Neveen M. Abdelmotilib
- Department of Food Technology, Arid Lands Cultivation Research Institute (ALCRI), City of Scientific Research and Technological Applications (SRTA-CITY), New Borg El-Arab City, Egypt
| | - Mounir M. Salem-Bekhit
- Kayyali Chair for Pharmaceutical Industries, Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Mohamed M. Salem
- College of Medicine, Huazhong University of Science and Technology, Wuhan, China
| | - Soumya Singh
- College of Medicine, Huazhong University of Science and Technology, Wuhan, China
| | - Mohamed K. Dandrawy
- Food Hygiene and Control Department, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt
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47
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Forsten E, Finger M, Scholand T, Deitert A, Kauffmann K, Büchs J. Inoculum cell count influences separation efficiency and variance in Ames plate incorporation and Ames RAMOS test. Sci Total Environ 2023; 905:167035. [PMID: 37709100 DOI: 10.1016/j.scitotenv.2023.167035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 08/29/2023] [Accepted: 09/11/2023] [Indexed: 09/16/2023]
Abstract
The Ames test is one of the most applied tools in mutagenicity testing of chemicals ever since its introduction by Ames et al. in the 1970s. Its principle is based on histidine auxotrophic bacteria that regain prototrophy through reverse mutations. In the presence of a mutagen, more reverse mutations occur that become visible as increased bacterial growth on medium without histidine. Many miniaturized formats of the Ames test have emerged to enable the testing of environmental water samples, increase experimental throughput, and lower the required amounts of test substances. However, most of these formats still rely on endpoint determinations. In contrast, the recently introduced Ames RAMOS test determines mutagenicity through online monitoring of the oxygen transfer rate. In this study, the oxygen transfer rate of Salmonella typhimurium TA100 during the Ames plate incorporation test was monitored and compared to the Ames RAMOS test to prove its validity further. Furthermore, the Ames RAMOS test in 96-well scale is newly introduced. For both the Ames plate incorporation and the Ames RAMOS test, the influence of the inoculum cell count on the negative control was highlighted: A lower inoculum cell count led to a higher coefficient of variation. However, a lower inoculum cell count also led to a higher separation efficiency in the Ames RAMOS test and, thus, to better detection of a mutagenic substance at lower concentrations.
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Affiliation(s)
- Eva Forsten
- AVT - Biochemical Engineering, RWTH Aachen University, Aachen, Germany
| | - Maurice Finger
- AVT - Biochemical Engineering, RWTH Aachen University, Aachen, Germany
| | - Theresa Scholand
- AVT - Biochemical Engineering, RWTH Aachen University, Aachen, Germany
| | - Alexander Deitert
- AVT - Biochemical Engineering, RWTH Aachen University, Aachen, Germany
| | - Kira Kauffmann
- AVT - Biochemical Engineering, RWTH Aachen University, Aachen, Germany
| | - Jochen Büchs
- AVT - Biochemical Engineering, RWTH Aachen University, Aachen, Germany.
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48
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Zeng S, Huang Y, Zhang X, Fu L, Sun Z, Li X. Molecular characterization of IncFII plasmid carrying blaNDM-5 in a Salmonella enterica serovar Typhimurium ST34 clinical isolate in China. mSphere 2023; 8:e0048023. [PMID: 37909767 PMCID: PMC10732066 DOI: 10.1128/msphere.00480-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 09/26/2023] [Indexed: 11/03/2023] Open
Abstract
IMPORTANCE In this study, an IncFII plasmid pIncFII-NDM5 carrying blaNDM-5 was found in carbapenem-resistant Salmonella enterica serovar Typhimurium (S. enterica serovar Typhimurium), which has conjugative transferability and carried blaNDM-5, bleMBL, mph(A), and blaTEM-1 four resistance genes that can mediate resistance to multiple antibiotics including cephalosporins, beta-lactamase inhibitor combinations, carbapenems, and macrolides. Phylogenetic analysis showed that 1104-65 and 1104-75 were closely related to other S. enterica serovar Typhimurium in this area. The above-mentioned S. enterica serovar Typhimurium chromosome carries blaCTX-M-55, qnrS1, and tet(A) genes, so the antibiotic resistance of isolates will be further enhanced after obtaining the pIncFII_NDM5-like plasmid. Meanwhile, we discovered a novel genetic structure of blaNDM-5 mediated by the IS26 composite transposon, which will expand our understanding of the emergence and spread of carbapenem-resistance genes. Altogether, the presence of the IncFII plasmid pIncFII-NDM5 further underscores the need for vigilant surveillance and appropriate infection control measures to mitigate the impact of carbapenem-resistant S. enterica serovar Typhimurium in clinical settings.
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Affiliation(s)
- Shihan Zeng
- Department of Clinical Laboratory, Fifth Affiliated Hospital, Southern Medical University, Guangzhou, China
| | - Yulan Huang
- Department of Clinical Laboratory, Fifth Affiliated Hospital, Southern Medical University, Guangzhou, China
| | - Xiwei Zhang
- Department of Clinical Laboratory, Fifth Affiliated Hospital, Southern Medical University, Guangzhou, China
| | - Liang Fu
- Department of Clinical Laboratory, Fifth Affiliated Hospital, Southern Medical University, Guangzhou, China
| | - Zhaohui Sun
- Department of Laboratory Medicine, General Hospital of Southern Theater Command, Guangzhou, China
| | - Xiaoyan Li
- Department of Clinical Laboratory, Fifth Affiliated Hospital, Southern Medical University, Guangzhou, China
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49
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Spragge F, Bakkeren E, Jahn MT, B N Araujo E, Pearson CF, Wang X, Pankhurst L, Cunrath O, Foster KR. Microbiome diversity protects against pathogens by nutrient blocking. Science 2023; 382:eadj3502. [PMID: 38096285 DOI: 10.1126/science.adj3502] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 11/01/2023] [Indexed: 12/18/2023]
Abstract
The human gut microbiome plays an important role in resisting colonization of the host by pathogens, but we lack the ability to predict which communities will be protective. We studied how human gut bacteria influence colonization of two major bacterial pathogens, both in vitro and in gnotobiotic mice. Whereas single species alone had negligible effects, colonization resistance greatly increased with community diversity. Moreover, this community-level resistance rested critically upon certain species being present. We explained these ecological patterns through the collective ability of resistant communities to consume nutrients that overlap with those used by the pathogen. Furthermore, we applied our findings to successfully predict communities that resist a novel target strain. Our work provides a reason why microbiome diversity is beneficial and suggests a route for the rational design of pathogen-resistant communities.
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Affiliation(s)
- Frances Spragge
- Department of Biology, University of Oxford, Oxford, UK
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Erik Bakkeren
- Department of Biology, University of Oxford, Oxford, UK
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Martin T Jahn
- Department of Biology, University of Oxford, Oxford, UK
- Department of Biochemistry, University of Oxford, Oxford, UK
| | | | - Claire F Pearson
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
| | - Xuedan Wang
- Department of Biology, University of Oxford, Oxford, UK
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Louise Pankhurst
- Department of Biology, University of Oxford, Oxford, UK
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Olivier Cunrath
- CNRS, UMR7242, Biotechnology and Cell Signaling, University of Strasbourg, Illkirch, France
| | - Kevin R Foster
- Department of Biology, University of Oxford, Oxford, UK
- Department of Biochemistry, University of Oxford, Oxford, UK
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50
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Wu-Chen RA, Feng J, Elhadidy M, Nambiar RB, Liao X, Yue M, Ding T. Long-term exposure to food-grade disinfectants causes cross-resistance to antibiotics in Salmonella enterica serovar Typhimurium strains with different antibiograms and sequence types. Antimicrob Resist Infect Control 2023; 12:145. [PMID: 38093321 PMCID: PMC10717106 DOI: 10.1186/s13756-023-01333-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Accepted: 11/09/2023] [Indexed: 12/17/2023] Open
Abstract
BACKGROUND Disinfectants are important in the food industry to prevent the transmission of pathogens. Excessive use of disinfectants may increase the probability of bacteria experiencing long-term exposure and consequently resistance and cross-resistance to antibiotics. This study aims to investigate the cross-resistance of multidrug-resistant, drug-resistant, and drug-susceptible isolates of Salmonella enterica serovar Typhimurium (S. Typhimurium) with different sequence types (STs) to a group of antibiotics after exposure to different food-grade disinfectants. METHODS A panel of 27 S. Typhimurium strains with different antibiograms and STs were exposed to increasing concentrations of five food-grade disinfectants, including hydrogen peroxide (H2O2), benzalkonium chloride (BAC), chlorine dioxide (ClO2), sodium hypochlorite (NaClO), and ethanol. Recovered evolved strains were analyzed using genomic tools and phenotypic tests. Genetic mutations were screened using breseq pipeline and changes in resistance to antibiotics and to the same disinfectant were determined. The relative fitness of evolved strains was also determined. RESULTS Following exposure to disinfectants, 22 out of 135 evolved strains increased their resistance to antibiotics from a group of 14 clinically important antibiotics. The results also showed that 9 out of 135 evolved strains had decreased resistance to some antibiotics. Genetic mutations were found in evolved strains. A total of 77.78% of ST34, 58.33% of ST19, and 66.67% of the other STs strains exhibited changes in antibiotic resistance. BAC was the disinfectant that induced the highest number of strains to cross-resistance to antibiotics. Besides, H2O2 induced the highest number of strains with decreased resistance to antibiotics. CONCLUSIONS These findings provide a basis for understanding the effect of disinfectants on the antibiotic resistance of S. Typhimurium. This work highlights the link between long-term exposure to disinfectants and the evolution of resistance to antibiotics and provides evidence to promote the regulated use of disinfectants.
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Affiliation(s)
- Ricardo A Wu-Chen
- Department of Food Science and Nutrition, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, China
| | - Jinsong Feng
- Department of Food Science and Nutrition, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, China
| | - Mohamed Elhadidy
- Biomedical Sciences Program, University of Science and Technology, Zewail City of Science and Technology, Giza, Egypt
- Center for Genomics, Helmy Institute for Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
- Department of Bacteriology, Mycology and Immunology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Reshma B Nambiar
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xinyu Liao
- Department of Food Science and Nutrition, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, China
- Future Food Laboratory, Innovation Center of Yangtze River Delta, Zhejiang University, Jiaxing, 314100, China
| | - Min Yue
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China.
| | - Tian Ding
- Department of Food Science and Nutrition, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, China.
- Future Food Laboratory, Innovation Center of Yangtze River Delta, Zhejiang University, Jiaxing, 314100, China.
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