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Morales-Dorantes V, Domínguez-Pérez RA, Pérez-Serrano RM, Solís-Sainz JC, García-Solís P, Espinosa-Cristóbal LF, Cabeza-Cabrera CV, Ayala-Herrera JL. The Distribution of Eight Antimicrobial Resistance Genes in Streptococcus oralis, Streptococcus sanguinis, and Streptococcus gordonii Strains Isolated from Dental Plaque as Oral Commensals. Trop Med Infect Dis 2023; 8:499. [PMID: 37999618 PMCID: PMC10674312 DOI: 10.3390/tropicalmed8110499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 11/12/2023] [Accepted: 11/15/2023] [Indexed: 11/25/2023] Open
Abstract
It has been proposed that oral commensal bacteria are potential reservoirs of a wide variety of antimicrobial resistance genes (ARGs) and could be the source of pathogenic bacteria; however, there is scarce information regarding this. In this study, three common streptococci of the mitis group (S. oralis, S. sanguinis, and S. gordonii) isolated from dental plaque (DP) were screened to identify if they were frequent reservoirs of specific ARGs (blaTEM, cfxA, tetM, tetW, tetQ, ermA, ermB, and ermC). DP samples were collected from 80 adults; one part of the sample was cultured, and from the other part DNA was obtained for first screening of the three streptococci species and the ARGs of interest. Selected samples were plated and colonies were selected for molecular identification. Thirty identified species were screened for the presence of the ARGs. From those selected, all of the S. sanguinis and S. oralis carried at least three, while only 30% of S. gordonii strains carried three or more. The most prevalent were tetM in 73%, and blaTEM and tetW both in 66.6%. On the other hand, ermA and cfxA were not present. Oral streptococci from the mitis group could be considered frequent reservoirs of specifically tetM, blaTEM, and tetW. In contrast, these three species appear not to be reservoirs of ermA and cfxA.
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Affiliation(s)
- Verónica Morales-Dorantes
- Laboratory of Multidisciplinary Dentistry Research, Faculty of Medicine, Universidad Autónoma de Querétaro, Santiago de Querétaro 76176, Mexico
| | - Rubén Abraham Domínguez-Pérez
- Laboratory of Multidisciplinary Dentistry Research, Faculty of Medicine, Universidad Autónoma de Querétaro, Santiago de Querétaro 76176, Mexico
| | - Rosa Martha Pérez-Serrano
- Laboratorio de Genética y Biología Molecular, Faculty of Medicine, Universidad Autónoma de Querétaro, Santiago de Querétaro 76176, Mexico
| | - Juan Carlos Solís-Sainz
- Departamento de Investigación Biomédica, Faculty of Medicine, Universidad Autónoma de Querétaro, Santiago de Querétaro 76176, Mexico
| | - Pablo García-Solís
- Departamento de Investigación Biomédica, Faculty of Medicine, Universidad Autónoma de Querétaro, Santiago de Querétaro 76176, Mexico
| | - León Francisco Espinosa-Cristóbal
- Programa de Maestría en Ciencias Odontológicas, Departamento de Estomatología, Instituto de Ciencias Biomédicas, Universidad Autónoma de Ciudad Juárez, Ciudad Juárez 32310, Mexico
| | - Claudia Verónica Cabeza-Cabrera
- Clínica de la Licenciatura y Posgrados de Odontología, Faculty of Medicine, Universidad Autónoma de Querétaro, Santiago de Querétaro 76176, Mexico
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Cumulative Antibiogram: A Rapid Method to Hinder Transmission of Resistant Bacteria to Oral Cavity of Newborn Babies. Antibiotics (Basel) 2023; 12:antibiotics12010080. [PMID: 36671281 PMCID: PMC9854765 DOI: 10.3390/antibiotics12010080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 12/21/2022] [Accepted: 12/29/2022] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND A rapid bacterial diagnostic is needed more and more in the treatment of patients, because of the emergence of antibiotic resistance. The cumulative antibiogram, an annual report that monitors antimicrobial resistance trends in health care facilities, may provide a profile of empirical therapy useful in diverse emergency situations, such as transmission of resistant bacteria to oral cavity of newborn babies. We aimed to draw a profile of antibiotic resistance encountered. METHODS We assessed the antibiotic resistance (ABR) profile in childbearing women and newborn babies in Ploiesti Obstetrics and Gynecology Hospital by the disk diffusion method characterizing the multidrug-resistant organisms after isolation and identification by phenotypic tests. Extended-spectrum β-lactamase (ESBL)-producing Enterobacterales (ESBL-E), Carbapenem-resistant Enterobacterales (CRE), vancomycin-resistant Enterococci (VRE), methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin resistant Group B Streptococcus (VR-GBS) were detected. RESULTS The prevalence of antibiotic resistance was 11.32% (53/468), while the prevalence of the ESBL-E, MRSA, VRE and VR-GBS strains was 8.34% (39/468). Within the bacteria isolated from fifty-three childbearing women, the prevalence of ESBL-E, MRSA, VRE and VR-GBS was 22.64% (12/53), 32.08% (17/53), 11.32% (6/53) and 7.55% (4/53). In the whole studied group, the prevalence was 2.56% (12/468), 3.63% (17/468), 1.28% (6/468) and 0.86% (4/468). Resistant bacteria were detected at birth in the oral cavity of the newborn babies in all cases. Maternal and neonatal isolates shared similar characteristics. CONCLUSIONS Cumulative antibiogram is useful in case of empiric treatment needed in diverse emergencies, such as transmission of resistant bacteria to oral cavity of newborn babies.
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Brooks L, Narvekar U, McDonald A, Mullany P. Prevalence of antibiotic resistance genes in the oral cavity and mobile genetic elements that disseminate antimicrobial resistance: A systematic review. Mol Oral Microbiol 2022; 37:133-153. [DOI: 10.1111/omi.12375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 05/23/2022] [Accepted: 06/01/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Laura Brooks
- UCL Eastman Dental Institute University College London 47–49 Huntley St London WC1E 6DG UK
| | - Unnati Narvekar
- UCL Eastman Dental Institute University College London 47–49 Huntley St London WC1E 6DG UK
| | - Ailbhe McDonald
- UCL Eastman Dental Institute University College London 47–49 Huntley St London WC1E 6DG UK
| | - Peter Mullany
- UCL Eastman Dental Institute University College London 47–49 Huntley St London WC1E 6DG UK
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Liu Y, Zhang F. Changes of antibiotic resistance genes and gut microbiota after the ingestion of goat milk. J Dairy Sci 2022; 105:4804-4817. [PMID: 35346469 DOI: 10.3168/jds.2021-21325] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 01/28/2022] [Indexed: 11/19/2022]
Abstract
Antibiotic resistance genes, as newly emerging contaminants, have become a serious challenge to public health through the food chain. The gut of humans and animals is an important reservoir for the development and dissemination of antibiotic resistance genes because of the great abundance and diversity of intestinal microbiota. In the present study, we evaluated the influence of goat milk on the diversity and abundance of antibiotic resistance genes and gut microbial communities, especially pathogenic bacteria. Male mice were used, 12 for each of the 2 groups: a control group that received sterile distilled water and a treated group that received goat milk, and gut microbiota and antibiotic resistance genes were compared in these groups using metagenomic analysis. The results revealed that ingestion of goat milk decreased the diversity and abundance of antibiotic resistance genes in the mice gut. The relative abundance of fluoroquinolone, peptide, macrolide, and β-lactam resistance genes in the total microbial genes significantly decreased after the intervention. Goat milk intake also significantly reduced the abundance of pathogenic bacteria, such as Clostridium bolteae, Clostridium symbiosum, Helicobacter cinaedi, and Helicobacter bilis. Therefore, goat milk intake might decrease the transfer potential of antibiotic resistance gene to pathogenic bacteria in the gut. In addition, bacteria with multiple resistance mechanisms accounted for approximately 4.5% of total microbial communities in the control group, whereas it was not detectable in the goat milk group, indicating the total inhibition by goat milk intake. This study highlights the influence of goat milk on antibiotic resistome and microbial communities in the gut, and provides a new insight into the function of goat milk for further study.
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Affiliation(s)
- Yufang Liu
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710119, China
| | - Fuxin Zhang
- College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710119, China.
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Kang Y, Sun B, Chen Y, Lou Y, Zheng M, Li Z. Dental Plaque Microbial Resistomes of Periodontal Health and Disease and Their Changes after Scaling and Root Planing Therapy. mSphere 2021; 6:e0016221. [PMID: 34287005 PMCID: PMC8386447 DOI: 10.1128/msphere.00162-21] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Accepted: 05/23/2021] [Indexed: 11/20/2022] Open
Abstract
The human oral microbial community has been considered a reservoir of antibiotic resistance. Currently, the effects of periodontitis and the scaling and root planing (SRP) treatment on the performance of antibiotic-resistant genes (ARGs) and metal-resistant genes (MRGs) in the dental plaque microbiota are not well characterized. To explore this issue, we selected 48 healthy-state (HS), 40 periodontitis-state (PS; before treatment), and 24 resolved-state (RS; after SRP treatment) metagenomic data of dental plaque samples from the Sequence Read Archive (SRA) database. NetShift analysis identified Fretibacterium fastidiosum, Tannerella forsythia, and Campylobacter rectus as key drivers during dental plaque microbiota alteration in the progression of periodontitis. Periodontitis and SRP treatment resulted in an increase in the number of ARGs and MRGs in dental plaque and significantly altered the composition of ARG and MRG profiles. Bacitracin, beta-lactam, macrolide-lincosamide-streptogramin (MLS), tetracycline, and multidrug resistance genes were the main classes of ARGs with high relative abundance, whereas multimetal, iron, chromium, and copper resistance genes were the primary types of MRGs in dental plaque microbiota. The cooccurrence of ARGs, MRGs, and mobile genetic elements (MGEs) indicated that a coselection phenomenon exists in the resistomes of dental plaque microbiota. Overall, our data provide new insights into the standing of the distribution of ARGs and MRGs in oral microbiota of periodontitis patients, and it was possible to contribute to the understanding of the complicated correlations among microorganisms, resistomes, and MGEs. IMPORTANCE The emergence and development of resistance to antibiotics in periodontal pathogens have affected the success rate of treatment for periodontitis. The development of new antibacterial strategies is urgently needed to help control and treat periodontal disease, and dental plaque microbiome studies offer a promising new angle of attack. In this study, we investigated the dental plaque microbiota and resistomes in periodontal health and disease states and their changes after SRP therapy. This is the first analysis of the profile of the microbial community and antibiotic and metal resistance genes in dental plaque by the metagenomic approach, to the best of our knowledge. Monitoring the profile of these resistomes has huge potential to provide reference levels for proper antibiotics use and the development of new antimicrobial strategies in periodontitis therapy and thereby improve actual efficacy of the treatment regimens.
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Affiliation(s)
- Yutong Kang
- State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
- Wenzhou Key Laboratory of Sanitary Microbiology, Key Laboratory of Laboratory Medicine, Ministry of Education, School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Bianjin Sun
- Eye Hospital and School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
- National Clinical Research Center for Ocular Diseases, Wenzhou, Zhejiang, China
| | - Yiju Chen
- Wenzhou Key Laboratory of Sanitary Microbiology, Key Laboratory of Laboratory Medicine, Ministry of Education, School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Yongliang Lou
- Wenzhou Key Laboratory of Sanitary Microbiology, Key Laboratory of Laboratory Medicine, Ministry of Education, School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Meiqin Zheng
- Eye Hospital and School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
- National Clinical Research Center for Ocular Diseases, Wenzhou, Zhejiang, China
| | - Zhenjun Li
- State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
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Arredondo A, Blanc V, Mor C, Nart J, León R. Tetracycline and multidrug resistance in the oral microbiota: differences between healthy subjects and patients with periodontitis in Spain. J Oral Microbiol 2020; 13:1847431. [PMID: 33391624 PMCID: PMC7717685 DOI: 10.1080/20002297.2020.1847431] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Introduction: Antibiotic resistance is widely found even among bacterial populations not having been exposed to selective pressure by antibiotics, such as tetracycline. In this study we analyzed the tetracycline-resistant subgingival microbiota of healthy subjects and of patients with periodontitis, comparing the prevalence of tet genes and their multidrug resistance profiles. Methods: Samples from 259 volunteers were analyzed, obtaining 813 tetracycline-resistant isolates. The prevalence of 12 antibiotic resistance genes was assessed, and multidrug profiles were built. Each isolate was identified by 16S rRNA sequencing. Differences in qualitative data and quantitative data were evaluated using the chi-square test and the Mann-Whitney-U test, respectively. Results: tet(M) was the most frequently detected tet gene (52.03%). We observed significant differences between the prevalence of tet(M), tet(W), tet(O), tet(32) and tet(L) in both populations studied. Multidrug resistance was largely observed, with resistance to kanamycin being the most detected (83.64%). There were significant differences between the populations in the prevalence of kanamycin, chloramphenicol, and cefotaxime resistance. Resistant isolates showed significantly different prevalence between the two studied groups. Conclusion: The high prevalence of multidrug resistance and tetracycline resistance genes found in the subgingival microbiota, highlights the importance of performing wider and more in-depth analysis of antibiotic resistance in the oral microbiota.
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Affiliation(s)
- Alexandre Arredondo
- Department of Microbiology, Dentaid Research Center, Cerdanyola Del Vallès, Spain.,Departament De Genètica I Microbiologia, Universitat Autònoma De Barcelona, Bellaterra, Spain
| | - Vanessa Blanc
- Department of Microbiology, Dentaid Research Center, Cerdanyola Del Vallès, Spain
| | - Carolina Mor
- Department of Periodontology, Universitat Internacional De Catalunya, Barcelona, Spain
| | - José Nart
- Department of Periodontology, Universitat Internacional De Catalunya, Barcelona, Spain
| | - Rubén León
- Department of Microbiology, Dentaid Research Center, Cerdanyola Del Vallès, Spain
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Tent PA, Juncar RI, Onisor F, Bran S, Harangus A, Juncar M. The pathogenic microbial flora and its antibiotic susceptibility pattern in odontogenic infections. Drug Metab Rev 2019; 51:340-355. [PMID: 30999773 DOI: 10.1080/03602532.2019.1602630] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Suppurative head and neck infections of odontogenic origin are the most frequent type of head and neck infections. According to the literature, 7-10% of all antibiotics are currently prescribed for their treatment. Since penicillin was invented, the overall antibiotic sensitivity and resistance pattern of the isolated pathogenic microflora has continuously changed. The response of microorganisms to antibiotics and the development of resistance to their action is a purely evolutive process characterized by genetic mutations, acquisition of genetic material or alteration of gene expression and metabolic adaptations. All this makes challenging and difficult the correct choice of empirical antibiotic treatment for head and neck space infections even today. The aim of this paper was to evaluate the literature and to evidence the most frequent locations of odontogenic head and neck infections, the dominant pathogenic microbial flora, the genetic mutations and metabolic changes necessary for bacteria in order to aquire antibiotic resistance and as well its susceptibility and resistance to common antibiotics. We also aimed to highlight the possible changes in bacterial resistance to antibiotics over time, and to assess whether or not there is a need for fundamental changes in the empirical antibiotic treatment of these infections and show which these would be.
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Affiliation(s)
- Paul Andrei Tent
- Dental Medicine, Universitatea din Oradea Facultatea de Medicina si Farmacie , Oradea , Romania
| | - Raluca Iulia Juncar
- Dental Medicine, Universitatea din Oradea Facultatea de Medicina si Farmacie , Oradea , Romania
| | - Florin Onisor
- Department of Oral and Maxilo-Facial surgery and Radiology, Iuliu Hatieganu University of Medicine and Pharmacy , Cluj-Napoca , Romania
| | - Simion Bran
- Department of Oral and Maxilo-Facial surgery and Radiology, Iuliu Hatieganu University of Medicine and Pharmacy , Cluj-Napoca , Romania
| | - Antonia Harangus
- Spitalul Clinic de Pneumoftiziologie Leon Daniello Cluj-Napoca , Cluj-Napoca , Romania
| | - Mihai Juncar
- Dental Medicine, Universitatea din Oradea Facultatea de Medicina si Farmacie , Oradea , Romania
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Zhang Y, Zhang Q. Relationship between tetracycline antibiotic susceptibility and genotype in oral cavity Lactobacilli clinical isolates. Antimicrob Resist Infect Control 2019; 8:27. [PMID: 30740220 PMCID: PMC6360694 DOI: 10.1186/s13756-019-0483-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 01/30/2019] [Indexed: 11/16/2022] Open
Abstract
Background Antibiotic resistance, is often conferred by the presence of antibiotic resistance genes. This study aimed to investigate the relationship between tetracycline resistance (Tet-R) and genotype in 31 Lactobacillus isolates from caries-active patients. Methods The tetracycline susceptibility of Lactobacillus isolates was determined using the agar spot test and the genetic characteristics associated with tetracycline resistance using whole-genome sequencing (WGS). Results The minimum inhibitory concentration (MIC) values of most isolates were equal to or lower than the breakpoint MIC values. Four strains that were phenotypically more sensitive (L. fermentum B09, S23 and L. rhamonsus B17) or more resistant (L. plantarum B43) than other isolates to tetracycline were subjected to conduct whole-genome sequencing in order to detect the tetracycline resistance genes. The results revealed that the most common Tet-R genes in Lactobacillus strains were tetT, tetW, tetO and tetL. In addition, tetPB, tcr3 and otrA were detected for the first time. There were distinct Tet-R gene mutations in Lactobacillus isolates. Overall, the mean expression values of Tet-R-mutated genes in L. plantarum B43 were elevated, and the relative expression levels of tetT and tetW genes in L. rhamonsus B17 L. fermentum B09 and S23 were decreased relative to reference strains. Conclusion The results of this study indicate that Lactobacillus isolates from saliva of caries-active patients do not present considerable tetracycline resistance reservoirs. However, genetic compounds associated with tetracycline resistance were identified by whole-genome sequencing, providing meaningful insights into tetracycline resistance mechanisms.
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Affiliation(s)
- Yifei Zhang
- Central Laboratory, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing, People’s Republic of China
| | - Qian Zhang
- Central Laboratory, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing, People’s Republic of China
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Lunde TM, Roberts AP, Al-Haroni M. Determination of copy number and circularization ratio of Tn 916-Tn 1545 family of conjugative transposons in oral streptococci by droplet digital PCR. J Oral Microbiol 2018; 11:1552060. [PMID: 30598735 PMCID: PMC6292373 DOI: 10.1080/20002297.2018.1552060] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 11/12/2018] [Accepted: 11/19/2018] [Indexed: 11/09/2022] Open
Abstract
Background: Tn916 and Tn1545 are paradigms of a large family of related, broad host range, conjugative transposons that are widely distributed in bacteria and contribute to the spread of antibiotic resistance genes (ARGs). Variation in the copy number (CN) of Tn916-Tn1545 elements and the circularization ratio (CR) may play an important role in propagation of ARGs carried by these elements. Objectives and Design: In this study, the CN and CR of Tn916-Tn1545 elements in oral streptococci were determined using droplet digital PCR (ddPCR). In addition, we investigated the influence of tetracycline on the CR of Tn916-Tn1545 elements. Results: The ddPCR assay designed in this study is a reliable way to rapidly determine CN and CR of Tn916-Tn1545 elements. Conclusions: Our data also suggest that Tn916-Tn1545 elements are generally stable without selective pressure in the clinical oral Streptococcus strains investigated in this study.
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Affiliation(s)
- Tracy Munthali Lunde
- Department of Clinical Dentistry, Faculty of Health Sciences, UiT the Arctic University of Norway, Tromsø, Norway
| | - Adam P Roberts
- Department of Parasitology, Liverpool School of Tropical Medicine, Liverpool, UK.,Centre for Drugs and Diagnostics, Liverpool School of Tropical Medicine, Liverpool, UK
| | - Mohammed Al-Haroni
- Department of Clinical Dentistry, Faculty of Health Sciences, UiT the Arctic University of Norway, Tromsø, Norway
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de Lima BR, Nicoloso GF, Fatturi-Parolo CC, Ferreira MBC, Montagner F, Casagrande L. Prevotella
strains and lactamic resistance gene distribution in different oral environments of children with pulp necrosis. Int Endod J 2018; 51:1196-1204. [DOI: 10.1111/iej.12948] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 04/30/2018] [Indexed: 11/30/2022]
Affiliation(s)
- B. R. de Lima
- Post-Graduate Program in Dental Clinics; Division of Pediatric Dentistry; Federal University of Rio Grande do Sul - UFRGS; Porto Alegre Brazil
| | - G. F. Nicoloso
- Post-Graduate Program in Dental Clinics; Division of Pediatric Dentistry; Federal University of Rio Grande do Sul - UFRGS; Porto Alegre Brazil
| | - C. C. Fatturi-Parolo
- Division of Cariology; Department of Preventive and Social Dentistry; Federal University of Rio Grande do Sul - UFRGS; Porto Alegre Brazil
| | - M. B. C. Ferreira
- Department of Farmacology; Institute of Basic Health Sciences; Federal University of Rio Grande do Sul - UFRGS; Porto Alegre Brazil
| | - F. Montagner
- Post-Graduate Program in Dental Clinics; Division of Endodontics; Federal University of Rio Grande do Sul - UFRGS; Porto Alegre Brazil
| | - L. Casagrande
- Post-Graduate Program in Dental Clinics; Division of Pediatric Dentistry; Federal University of Rio Grande do Sul - UFRGS; Porto Alegre Brazil
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Mai S, Mauger MT, Niu LN, Barnes JB, Kao S, Bergeron BE, Ling JQ, Tay FR. Potential applications of antimicrobial peptides and their mimics in combating caries and pulpal infections. Acta Biomater 2017; 49:16-35. [PMID: 27845274 DOI: 10.1016/j.actbio.2016.11.026] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 10/24/2016] [Accepted: 11/10/2016] [Indexed: 02/02/2023]
Abstract
Antimicrobial peptides (AMPs) are short cationic host-defense molecules that provide the early stage of protection against invading microbes. They also have important modulatory roles and act as a bridge between innate and acquired immunity. The types and functions of oral AMPs were reviewed and experimental reports on the use of natural AMPs and their synthetic mimics in caries and pulpal infections were discussed. Natural AMPs in the oral cavity, predominantly defensins, cathelicidins and histatins, possess antimicrobial activities against oral pathogens and biofilms. Incomplete debridement of microorganisms in root canal space may precipitate an exacerbated immune response that results in periradicular bone resorption. Because of their immunomodulatory and wound healing potentials, AMPs stimulate pro-inflammatory cytokine production, recruit host defense cells and regulate immuno-inflammatory responses in the vicinity of the pulp and periapex. Recent rapid advances in the development of synthetic AMP mimics offer exciting opportunities for new therapeutic initiatives in root canal treatment and regenerative endodontics. STATEMENT OF SIGNIFICANCE Identification of new therapeutic strategies to combat antibiotic-resistant pathogens and biofilm-associated infections continues to be one of the major challenges in modern medicine. Despite the presence of commercialization hurdles and scientific challenges, interests in using antimicrobial peptides as therapeutic alternatives and adjuvants to combat pathogenic biofilms have never been foreshortened. Not only do these cationic peptides possess rapid killing ability, their multi-modal mechanisms of action render them advantageous in targeting different biofilm sub-populations. These factors, together with adjunctive bioactive functions such as immunomodulation and wound healing enhancement, render AMPs or their synthetic mimics exciting candidates to be considered as adjuncts in the treatment of caries, infected pulps and root canals.
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12
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Reynolds LJ, Roberts AP, Anjum MF. Efflux in the Oral Metagenome: The Discovery of a Novel Tetracycline and Tigecycline ABC Transporter. Front Microbiol 2016; 7:1923. [PMID: 27999567 PMCID: PMC5138185 DOI: 10.3389/fmicb.2016.01923] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Accepted: 11/16/2016] [Indexed: 01/07/2023] Open
Abstract
Antibiotic resistance in human bacterial pathogens and commensals is threatening our ability to treat infections and conduct common medical procedures. As novel antibiotics are discovered and marketed it is important that we understand how resistance to them may arise and know what environments may act as reservoirs for such resistance genes. In this study a tetracycline and tigecycline resistant clone was identified by screening a human saliva metagenomic library in Escherichia coli EPI300 on agar containing 5 μg/ml tetracycline. Sequencing of the DNA insert present within the tetracycline resistant clone revealed it to contain a 7,765 bp fragment harboring novel ABC half transporter genes, tetAB(60). Mutagenesis studies performed on these genes confirmed that they were responsible for the tetracycline and tigecycline resistance phenotypes. Growth studies performed using E. coli EPI300 clones that harbored either the wild type, the mutated, or none of these genes indicated that there was a fitness cost associated with presence of these genes, with the isolate harboring both genes exhibiting a significantly slower growth than control strains. Given the emergence of E. coli strains that are sensitive only to tigecycline and doxycycline it is concerning that such a resistance mechanism has been identified in the human oral cavity.
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Affiliation(s)
- Liam J Reynolds
- Department of Microbial Diseases, UCL Eastman Dental Institute, Faculty of Medical Sciences, University College LondonLondon, UK; Department of Bacteriology, Animal and Plant Health AgencyAddlestone, UK
| | - Adam P Roberts
- Department of Microbial Diseases, UCL Eastman Dental Institute, Faculty of Medical Sciences, University College London London, UK
| | - Muna F Anjum
- Department of Microbial Diseases, UCL Eastman Dental Institute, Faculty of Medical Sciences, University College LondonLondon, UK; Department of Bacteriology, Animal and Plant Health AgencyAddlestone, UK
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Moraes LC, Só MVR, Dal Pizzol TDS, Ferreira MBC, Montagner F. Distribution of Genes Related to Antimicrobial Resistance in Different Oral Environments: A Systematic Review. J Endod 2015; 41:434-41. [DOI: 10.1016/j.joen.2014.12.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2014] [Revised: 10/12/2014] [Accepted: 12/16/2014] [Indexed: 10/23/2022]
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14
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Roberts AP, Mullany P. Oral biofilms: a reservoir of transferable, bacterial, antimicrobial resistance. Expert Rev Anti Infect Ther 2014; 8:1441-50. [DOI: 10.1586/eri.10.106] [Citation(s) in RCA: 115] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Warburton PJ, Ciric L, Lerner A, Seville LA, Roberts AP, Mullany P, Allan E. TetAB46, a predicted heterodimeric ABC transporter conferring tetracycline resistance in Streptococcus australis isolated from the oral cavity. J Antimicrob Chemother 2012; 68:17-22. [PMID: 22941900 PMCID: PMC3522447 DOI: 10.1093/jac/dks351] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Objectives To identify the genes responsible for tetracycline resistance in a strain of Streptococcus australis isolated from pooled saliva from healthy volunteers in France. S. australis is a viridans Streptococcus, originally isolated from the oral cavity of children in Australia, and subsequently reported in the lungs of cystic fibrosis patients and as a cause of invasive disease in an elderly patient. Methods Agar containing 2 mg/L tetracycline was used for the isolation of tetracycline-resistant organisms. A genomic library in Escherichia coli was used to isolate the tetracycline resistance determinant. In-frame deletions and chromosomal repair were used to confirm function. Antibiotic susceptibility was determined by agar dilution and disc diffusion assay. Results The tetracycline resistance determinant from S. australis FRStet12 was isolated from a genomic library in E. coli and DNA sequencing showed two open reading frames predicted to encode proteins with similarity to multidrug resistance-type ABC transporters. Both genes were required for tetracycline resistance (to both the naturally occurring and semi-synthetic tetracyclines) and they were designated tetAB(46). Conclusions This is the first report of a predicted ABC transporter conferring tetracycline resistance in a member of the oral microbiota.
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Affiliation(s)
- Philip J Warburton
- Research Department of Microbial Diseases, UCL Eastman Dental Institute, 256 Gray's Inn Road, University College London, London WC1X 8LD, UK
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Hegstad K, Mikalsen T, Coque TM, Werner G, Sundsfjord A. Mobile genetic elements and their contribution to the emergence of antimicrobial resistant Enterococcus faecalis and Enterococcus faecium. Clin Microbiol Infect 2011; 16:541-54. [PMID: 20569265 DOI: 10.1111/j.1469-0691.2010.03226.x] [Citation(s) in RCA: 234] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mobile genetic elements (MGEs) including plasmids and transposons are pivotal in the dissemination and persistence of antimicrobial resistance in Enterococcus faecalis and Enterococcus faecium. Enterococcal MGEs have also been shown to be able to transfer resistance determinants to more pathogenic bacteria such as Staphylococcus aureus. Despite their importance, we have a limited knowledge about the prevalence, distribution and genetic content of specific MGEs in enterococcal populations. Molecular epidemiological studies of enterococcal MGEs have been hampered by the lack of standardized molecular typing methods and relevant genome information. This review focuses on recent developments in the detection of MGEs and their contribution to the spread of antimicrobial resistance in clinically relevant enterococci.
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Affiliation(s)
- K Hegstad
- Reference Centre for Detection of Antimicrobial Resistance, Department of Microbiology and Infection Control, University Hospital of North-Norway.
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Seville LA, Patterson AJ, Scott KP, Mullany P, Quail MA, Parkhill J, Ready D, Wilson M, Spratt D, Roberts AP. Distribution of tetracycline and erythromycin resistance genes among human oral and fecal metagenomic DNA. Microb Drug Resist 2009; 15:159-66. [PMID: 19728772 DOI: 10.1089/mdr.2009.0916] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
We have analyzed the total metagenomic DNA from both human oral and fecal samples derived from healthy volunteers from six European countries to determine the molecular basis for tetracycline and erythromycin resistance. We have determined that tet(M) and tet(W) are the most prevalent tetracycline resistance genes assayed for in the oral and fecal metagenomes, respectively. Additionally, tet(Q), tet(O), and tet(O/32/O) have been shown to be common. We have also shown that erm(B), erm(V), and erm(E) are common erythromycin resistance genes present in these environments. Further, we have demonstrated the ubiquitous presence of the Tn916 integrase in the oral metagenomes and the Tn4451 and Tn1549 integrase genes within the fecal metagenomes.
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Affiliation(s)
- Lorna A Seville
- Division of Microbial Diseases, UCL Eastman Dental Institute, London, United Kingdom
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Warburton P, Roberts AP, Allan E, Seville L, Lancaster H, Mullany P. Characterization of tet(32) genes from the oral metagenome. Antimicrob Agents Chemother 2009; 53:273-6. [PMID: 18955517 PMCID: PMC2612163 DOI: 10.1128/aac.00788-08] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2008] [Revised: 08/20/2008] [Accepted: 10/20/2008] [Indexed: 11/20/2022] Open
Abstract
tet(32) Was identified in three bacterial isolates and in metagenomic DNA from the human oral cavity. The regions immediately flanking the gene were found to have similarities to the mobile elements TnB1230 from Butyrivibrio fibrisolvens, ATE-3 from Arcanobacterium pyogenes, and CTn5 from Clostridium difficile.
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Affiliation(s)
- Philip Warburton
- Division of Microbial Diseases, UCL Eastman Dental Institute, University College London, London, United Kingdom
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Manuzon MY, Hanna SE, Luo H, Yu Z, Harper WJ, Wang HH. Quantitative assessment of the tetracycline resistance gene pool in cheese samples by real-time TaqMan PCR. Appl Environ Microbiol 2007; 73:1676-7. [PMID: 17209075 PMCID: PMC1828764 DOI: 10.1128/aem.01994-06] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A TaqMan real-time PCR assay was developed to quantify the tetS gene pool present in retail cheeses. This protocol offers a rapid, specific, sensitive, and culture-independent method for assessing antibiotic resistance genes in food samples rich in fats and proteins.
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Affiliation(s)
- Michele Y Manuzon
- Department of Food Science and Technology, The Ohio State University, Parker FST Building, 2015 Fyffe Ct., Columbus, OH 43210-1007, USA
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Rossi-Fedele G, Scott W, Spratt D, Gulabivala K, Roberts AP. Incidence and behaviour of Tn916-like elements within tetracycline-resistant bacteria isolated from root canals. ACTA ACUST UNITED AC 2006; 21:218-22. [PMID: 16842505 DOI: 10.1111/j.1399-302x.2006.00279.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
INTRODUCTION Tetracycline resistance is commonly found in endodontic bacteria. One of the most common tetracycline-resistance genes is tet(M), which is often encoded on the broad-host-range conjugative transposon Tn916. This study aimed to determine whether tet(M) was present in bacteria isolated from endodontic patients at the Eastman Dental Institute and whether this gene was carried on the transferable conjugative transposon Tn916. METHODS The cultivable microflora isolated from 15 endodontic patients was screened for resistance to tetracycline. Polymerase chain reactions for tet(M) and for unique regions of Tn916 were carried out on the DNA of all tetracycline-resistant bacteria. Filter-mating experiments were used to see if transfer of any Tn916-like elements could occur. RESULTS Eight out of 15 tetracycline-resistant bacteria isolated were shown to possess tet(M). Furthermore, four of these eight were shown to possess the Tn916-unique regions linked to the tet(M) gene. Transfer experiments demonstrated that a Neisseria sp. donor could transfer an extremely unstable Tn916-like element to Enterococcus faecalis. CONCLUSIONS The tet(M) gene is present in the majority of tetracycline-resistant bacteria isolated in this study and the conjugative transposon Tn916 has been shown to be responsible for the support and transfer of this gene in some of the bacteria isolated.
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Affiliation(s)
- G Rossi-Fedele
- Endodontic Unit, Eastman Dental Institute, University College London, University of London, London, UK
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