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Nemathaga M, Smith RM, Malatji DP. Interactions between the helminth and intestinal microbiome in smallholder chicken farming systems. Front Vet Sci 2023; 10:1309151. [PMID: 38179334 PMCID: PMC10766368 DOI: 10.3389/fvets.2023.1309151] [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: 10/07/2023] [Accepted: 11/24/2023] [Indexed: 01/06/2024] Open
Abstract
Helminth parasite infections are widespread in smallholder farming systems affecting farmers and livestock animals. There are pathogenic parasites that populate the gut of their host and coexist closely with the gut microbiota. The physical and immunological environment of the gut can be modified by parasites and microbiota creating a wide range of interactions. These interactions modify the development of infection, affects overall host health, and can modify the way a host interacts with its bacterial microbiota. In addition, where there is a high worm burden parasites will affect the health of the host and intestinal tract colonization. This review highlights key studies on the interaction between helminth parasites and the intestinal microbiome to understand the relationship between parasitic worm infections and gut microbiome health in chickens. Finally, the review discusses modulations, molecular changes, and the importance of helminth-microbiome interactions for the host.
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Affiliation(s)
| | | | - Dikeledi P. Malatji
- Department of Agriculture and Animal Health, College of Agriculture and Environmental Science, University of South Africa, Roodepoort, South Africa
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2
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Teso-Pérez C, Martínez-Bueno M, Peralta Sánchez JM, Valdivia E, Fárez-Vidal ME, Martín-Platero AM. Circular and L50-like leaderless enterocins share a common ABC-transporter immunity gene. BMC Genomics 2023; 24:639. [PMID: 37875795 PMCID: PMC10598978 DOI: 10.1186/s12864-023-09750-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 10/18/2023] [Indexed: 10/26/2023] Open
Abstract
Microbes live within complex communities of interacting populations, either free-living in waters and soils or symbionts of animals and plants. Their interactions include the production of antimicrobial peptides (bacteriocins) to antagonize competitors, and these producers must carry their own immunity gene for self-protection. Whether other coexisting populations are sensitive or resistant to the bacteriocin producer will be key for the population dynamics within the microbial community. The immunity gene frequently consists of an ABC transporter to repel its own bacteriocin but rarely protects against a nonrelated bacteriocin. A case where this cross-resistance occurs mediated by a shared ABC transporter has been shown between enterocins MR10A/B and AS-48. The first is an L50-like leaderless enterocin, while AS-48 is a circular enterocin. In addition, L50-like enterocins such as MR10A/B have been found in E. faecalis and E. faecium, but AS-48 appears only in E. faecalis. Thus, using the ABC transporter of the enterocin MR10A/B gene cluster of Enterococcus faecalis MRR10-3 as a cross-resistance model, we aimed to unravel to what extent a particular ABC transporter can be shared across multiple bacteriocinogenic bacterial populations. To this end, we screened the MR10A/B-ABC transporters in available microbial genomes and analyzed their sequence homologies and distribution. Overall, our main findings are as follows: (i) the MR10A/B-ABC transporter is associated with multiple enterocin gene clusters; (ii) the different enterocins associated with this transporter have a saposin-like fold in common; (iii) the Mr10E component of the transporter is more conserved within its associated enterocin, while the Mr10FGH components are more conserved within the carrying species. This is the least known component of the transporter, but it has shown the greatest specificity to its corresponding enterocin. Bacteriocins are now being investigated as an alternative to antibiotics; hence, the wider or narrower distribution of the particular immunity gene should be taken into account for clinical applications to avoid the selection of resistant strains. Further research will be needed to investigate the mechanistic interactions between the Mr10E transporter component and the bacteriocin as well as the specific ecological and evolutionary mechanisms involved in the spread of the immunity transporter across multiple bacteriocins.
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Affiliation(s)
- Claudia Teso-Pérez
- Department of Microbiology, University of Granada, Avda. Fuentenueva, s/n, Granada, 18071, Spain
| | - Manuel Martínez-Bueno
- Department of Microbiology, University of Granada, Avda. Fuentenueva, s/n, Granada, 18071, Spain
| | - Juan Manuel Peralta Sánchez
- Department of Microbiology, University of Granada, Avda. Fuentenueva, s/n, Granada, 18071, Spain
- Department of Zoology, University of Seville, Avda. Reina Mercedes, 6, Seville, 41012, Spain
| | - Eva Valdivia
- Department of Microbiology, University of Granada, Avda. Fuentenueva, s/n, Granada, 18071, Spain
| | - María Esther Fárez-Vidal
- Department of Biochemistry and Molecular Biology III and Immunology, School of Medicine, University of Granada, Granada, 18016, Spain.
- Biomedical Research Institute of Granada, University Hospital Complex of Granada, University of Granada, Granada, 18071, Spain.
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3
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Kubovčiak J, Schmiedová L, Albrecht T, Těšický M, Tomášek O, Kauzálová T, Kreisinger J. Within-community variation of interspecific divergence patterns in passerine gut microbiota. Ecol Evol 2022; 12:e9071. [PMID: 35813907 PMCID: PMC9251858 DOI: 10.1002/ece3.9071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 05/31/2022] [Accepted: 06/07/2022] [Indexed: 12/11/2022] Open
Abstract
Gut microbiota (GM) often exhibit variation between different host species and co-divergence with hosts' phylogeny. Identifying these patterns is a key for understanding the mechanisms that shaped symbiosis between GM and its hosts. Therefore, both GM-host species specificity and GM-host co-divergence have been investigated by numerous studies. However, most of them neglected a possibility that different groups of bacteria within GM can vary in the tightness of their association with the host. Consequently, unlike most of these studies, we aimed to directly address how the strength of GM-host species specificity and GM-host co-divergence vary across different GM clades. We decomposed GM communities of 52 passerine species (394 individuals), characterized by 16S rRNA amplicon sequence variant (ASV) profiles, into monophyletic Binned Taxonomic units (BTUs). Subsequently, we analyzed strength of host species specificity and correlation with host phylogeny separately for resulting BTUs. We found that most BTUs exhibited significant host-species specificity in their composition. Notably, BTUs exhibiting high host-species specificity comprised bacterial taxa known to impact host's physiology and immune system. However, BTUs rarely displayed significant co-divergence with host phylogeny, suggesting that passerine GM evolution is not shaped primarily through a shared evolutionary history between the host and its gut microbes.
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Affiliation(s)
- Jan Kubovčiak
- Department of Zoology, Faculty of ScienceCharles UniversityPragueCzech Republic
| | - Lucie Schmiedová
- Department of Zoology, Faculty of ScienceCharles UniversityPragueCzech Republic
| | - Tomáš Albrecht
- Department of Zoology, Faculty of ScienceCharles UniversityPragueCzech Republic
- Institute of Vertebrate BiologyCzech Academy of SciencesBrnoCzech Republic
| | - Martin Těšický
- Department of Zoology, Faculty of ScienceCharles UniversityPragueCzech Republic
| | - Oldřich Tomášek
- Institute of Vertebrate BiologyCzech Academy of SciencesBrnoCzech Republic
| | - Tereza Kauzálová
- Institute of Vertebrate BiologyCzech Academy of SciencesBrnoCzech Republic
| | - Jakub Kreisinger
- Department of Zoology, Faculty of ScienceCharles UniversityPragueCzech Republic
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4
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Preclinical Safety Assessment of Bacillus subtilis BS50 for Probiotic and Food Applications. Microorganisms 2022; 10:microorganisms10051038. [PMID: 35630480 PMCID: PMC9144164 DOI: 10.3390/microorganisms10051038] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 05/11/2022] [Accepted: 05/13/2022] [Indexed: 12/12/2022] Open
Abstract
Despite the commercial rise of probiotics containing Bacillaceae spp., it remains important to assess the safety of each strain before clinical testing. Herein, we performed preclinical analyses to address the safety of Bacillus subtilis BS50. Using in silico analyses, we screened the 4.15 Mbp BS50 genome for genes encoding known Bacillus toxins, secondary metabolites, virulence factors, and antibiotic resistance. We also assessed the effects of BS50 lysates on the viability and permeability of cultured human intestinal epithelial cells (Caco-2). We found that the BS50 genome does not encode any known Bacillus toxins. The BS50 genome contains several gene clusters involved in the biosynthesis of secondary metabolites, but many of these antimicrobial metabolites (e.g., fengycin) are common to Bacillus spp. and may even confer health benefits related to gut microbiota health. BS50 was susceptible to seven of eight commonly prescribed antibiotics, and no antibiotic resistance genes were flanked by the complete mobile genetic elements that could enable a horizontal transfer. In cell culture, BS50 cell lysates did not diminish either Caco-2 viability or monolayer permeability. Altogether, BS50 exhibits a robust preclinical safety profile commensurate with commercial probiotic strains and likely poses no significant health risk to humans.
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Trościańczyk A, Nowakiewicz A, Osińska M, Łagowski D, Gnat S, Chudzik-Rząd B. Comparative characteristics of sequence types, genotypes and virulence of multidrug-resistant E. faecium isolated from various hosts in eastern Poland. Spread of clonal complex 17 in humans and animals. Res Microbiol 2022; 173:103925. [PMID: 35150875 DOI: 10.1016/j.resmic.2022.103925] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 02/02/2022] [Accepted: 02/02/2022] [Indexed: 11/26/2022]
Abstract
The aim of the study was to carry out a comparative analysis of the occurrence of sequence types, genotypes, and virulence genes of multidrug-resistant E. faecium isolated from humans, domestic animals, and wildlife from eastern Poland. The genetic correlation of strains was determined using multilocus sequence typing, and the method of Amplification of DNA fragments Surrounding Rare Restriction Sites. The presence of 49 different STs (including 12 not reported previously) was shown. All human isolates, 56% of E. faecium isolated from poultry and 40% isolated from wildlife, belonged to the hospital-adapted CC17. E. faecium CC17 were characterized by statistically higher resistance to aminoglycosides and penicillin, the presence of the aac(6')-Ie-aph(2")-Ia and hyl gene and mutations in gyrA and parC, compared to other strains (p > 0.05). E. faecium were classified into 73 genotypes grouped into clusters including isolates from the same host species. The present study showed that the virulence, resistance, and genotype profiles of E. faecium were correlated with the individual host but not with the sequence type. The occurrence of E. faecium CC17 in both humans and animals proves the large circulation of the complex among various hosts.
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Affiliation(s)
- Aleksandra Trościańczyk
- Sub-Department of Veterinary Microbiology, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, Akademicka 12, 20-033, Lublin, Poland.
| | - Aneta Nowakiewicz
- Sub-Department of Veterinary Microbiology, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, Akademicka 12, 20-033, Lublin, Poland.
| | - Marcelina Osińska
- Sub-Department of Veterinary Microbiology, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, Akademicka 12, 20-033, Lublin, Poland.
| | - Dominik Łagowski
- Sub-Department of Veterinary Microbiology, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, Akademicka 12, 20-033, Lublin, Poland.
| | - Sebastian Gnat
- Sub-Department of Veterinary Microbiology, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, Akademicka 12, 20-033, Lublin, Poland.
| | - Beata Chudzik-Rząd
- Department of Pharmaceutical Microbiology, Medical University of Lublin, Chodźki 1, 20-093, Lublin, Poland.
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Oruc O, Ceti̇n O, Onal Darilmaz D, Yüsekdag ZN. Determination of the biosafety of potential probiotic Enterococcus faecalis and Enterococcus faecium strains isolated from traditional white cheeses. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.111741] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Oguttu JW, Qekwana DN, Odoi A. Prevalence and Predictors of Antimicrobial Resistance Among Enterococcus spp. From Dogs Presented at a Veterinary Teaching Hospital, South Africa. Front Vet Sci 2021; 7:589439. [PMID: 33490130 PMCID: PMC7817767 DOI: 10.3389/fvets.2020.589439] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 12/07/2020] [Indexed: 12/14/2022] Open
Abstract
Background: While surveillance of antimicrobial drug resistance is ongoing in human medicine in South Africa, there is no such activity being performed in veterinary medicine. As a result, there is a need to investigate antimicrobial resistance among enterococci isolated from dogs in South Africa to improve understanding of the status of antimicrobial drug resistance given its public and veterinary public health importance. This study investigated antimicrobial resistance and factors associated with resistance profiles of enterococci isolated from dogs presented for veterinary care at a veterinary teaching hospital in South Africa. Methods: In total 102 Enterococcus isolated between 2007 and 2011 by a bacteriology laboratory at a teaching hospital were included in this study. Antimicrobial susceptibility of the isolates was determined against a panel of 18 antimicrobials using the Kirby Bauer disc diffusion technique. Univariate analysis was used to assess simple associations between year, season, breed group, age group, sex, and specimen as covariates and extensive drug resistance (XDR) as the outcome. Variables that were significant in the univariate analysis at a generous p-value ≤ 0.2 were included in the multivariable logistic models to investigate predictors of XDR. Results: All the Enterococcus isolates were resistant to at least one antimicrobial. High proportions of isolates were resistant against lincomycin (93%), kanamycin (87%), orbifloxacin (85%), and aminogycoside-lincosamide (77%). Ninety three percent (93%), 35.3, and 8.8% of the isolates exhibited multi-drug, extensive-drug and pan-drug resistance, respectively. Only year was significantly (p = 0.019) associated with extensive-drug resistance. Conclusion: Given the zoonotic potential of Enterococcus spp., the high antimicrobial resistance and multi-drug resistance observed in this study are a public health concern from one health perspective. The identified resistance to various antimicrobials may be useful in guiding clinicians especially in resource scarce settings where it is not always possible to perform AST when making treatment decisions.
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Affiliation(s)
- James Wabwire Oguttu
- Department of Agriculture and Animal Health, College of Agriculture and Environmental Sciences, University of South Africa, Johannesburg, South Africa
| | - Daniel Nenene Qekwana
- Section Veterinary Public Health, Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa
| | - Agricola Odoi
- Department of Agriculture and Animal Health, College of Agriculture and Environmental Sciences, University of South Africa, Johannesburg, South Africa.,Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Knoxville, TN, United States
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Olanrewaju TO, McCarron M, Dooley JSG, Arnscheidt J. Transfer of antibiotic resistance genes between Enterococcus faecalis strains in filter feeding zooplankton Daphnia magna and Daphnia pulex. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 659:1168-1175. [PMID: 31096330 DOI: 10.1016/j.scitotenv.2018.12.314] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 12/20/2018] [Accepted: 12/21/2018] [Indexed: 06/09/2023]
Abstract
Antibiotic resistant bacteria from faecal pollution sources are pervasive in aquatic environments. A facilitating role for the emergence of waterborne, multi-drug resistant bacterial pathogens has been attributed to biofiltration but had not yet been substantiated. This study investigated the effect of filtration and gut passage in Daphnia spp. on conjugal transfer of resistance genes in Enterococcus faecalis. In vivo conjugation experiments involved a vancomycin-resistant donor strain bearing a plasmid-borne vanA resistance gene, and two vancomycin-susceptible and rifampicin-resistant recipient strains in the presence of Daphnia magna or Daphnia pulex. Results showed successful transfer of the vanA resistance gene from donor to recipient; gene identity was confirmed by PCR and DNA sequencing. There was no significant difference in the number of transconjugants recovered from D. magna and D. pulex. However, transconjugant numbers differed by one order of magnitude between recipient strains. Transconjugant numbers from D. magna were also significantly different between treatments with ingestion of individual phytoplankton species before filtration of bacteria. The highest transfer efficiency calculated from excreted transconjugants was 2.5 × 10-6. This proof of concept for facilitation of horizontal gene transfer by a filter feeding organism provides evidence that Daphnia can disseminate antibiotic resistant transconjugants in the environment.
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Affiliation(s)
- Temilola O Olanrewaju
- School of Geography and Environmental Sciences, Ulster University, Cromore Road, Coleraine BT52 1SA, UK
| | - Mary McCarron
- School of Biomedical Sciences, Ulster University, Cromore Road, Coleraine BT52 1SA, UK
| | - James S G Dooley
- School of Biomedical Sciences, Ulster University, Cromore Road, Coleraine BT52 1SA, UK
| | - Joerg Arnscheidt
- School of Geography and Environmental Sciences, Ulster University, Cromore Road, Coleraine BT52 1SA, UK.
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Silvetti T, Morandi S, Brasca M. Does Enterococcus faecalis from Traditional Raw Milk Cheeses Serve as a Reservoir of Antibiotic Resistance and Pathogenic Traits? Foodborne Pathog Dis 2019; 16:359-367. [PMID: 30741557 DOI: 10.1089/fpd.2018.2542] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Enterococcus faecalis is not only a prevalent species among dairy microbial community but also a well-documented opportunistic pathogen. Food safety should exclude the possibility of consumer exposure to its virulence traits through consumption of dairy products. In this study, an integrated approach based on both phenotypic and genotypic methods was applied to investigate the incidence of antibiotic resistance and pathogenicity potential in 40 E. faecalis isolated from 10 Italian raw milk cheeses over a 13-year period (1997-2009). Among the 14 tested antibiotics, resistance to tetracycline, rifampicin, chloramphenicol, and erythromycin was observed, whereas vancomycin-resistant enterococci were not found. A high incidence (90% of strains) of the tet(M) gene emerged, whereas tet(K), tet(S), tet(L), int, and ermB genes were occasionally amplified (12.5%, 10%, 7.5%, 2.5% and 30%, respectively). No strain was positive for vancomycin-resistant determinants. Among the seven virulence determinants considered, the asa1, gelE, esp, and efaA genes were harbored. No other gene encoding for either different virulence factors (cylA, hyl, and ace) or amino acid decarboxylase activity (hdc, tdc, and odc) was detected. Consequently, E. faecalis isolated from raw milk cheeses does not represent a substantial reservoir of antimicrobial resistance and virulence factors if compared with clinical strains. However, this species occasionally harbors detrimental traits; thus, the possibility that it could be a route for transmission of pathogenic genes through dairy products should never be disregarded.
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Affiliation(s)
- Tiziana Silvetti
- Institute of Sciences of Food Production, Italian National Research Council, Milan, Italy
| | - Stefano Morandi
- Institute of Sciences of Food Production, Italian National Research Council, Milan, Italy
| | - Milena Brasca
- Institute of Sciences of Food Production, Italian National Research Council, Milan, Italy
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Karimi A, Ghalavand Z, Fallah F, Eslami P, Parvin M, Alebouyeh M, Rashidan M. Prevalence of virulence determinants and antibiotic resistance patterns of Enterococcus faecalis strains in patients with community-acquired urinary tract infections in Iran. INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH 2018; 28:599-608. [PMID: 30044128 DOI: 10.1080/09603123.2018.1497777] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 07/03/2018] [Indexed: 06/08/2023]
Abstract
The aim of this study was to characterize virulence factors and antibiotic resistance patterns in E. faecalis strains obtained from community-acquired urinary tract infections. A total of 70 E. faecalis isolates from Labbafinejad Hospital in Tehran were collected. Antibiotic resistance and virulence determinants were examined by phenotypic and molecular methods. Among 70 E. faecalis isolates, efba (97.1%), ace (95.7%), and gelE (94.3%) were the most prevalent virulence genes. The most common antibiotic resistance pattern was tetracycline (88.6%) and minocycline (87.1%). Multi-drug resistant phenotype was detected among 10% of them. Our results showed capability of E. faecalis strains for infection of the urinary tract in community. Involvement of virulence determinants in the pathogenesis of community acquired E. faecalis strains was proposed due to their high prevalence rates. Food producing animals were proposed as their environmental reservoirs, due to dominance of tetracycline resistance phenotype among them.
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Affiliation(s)
- Abdullah Karimi
- a Pediatric Infection Research Center, Research Institute for Children Health , Shahid Beheshti University of Medical Sciences , Tehran , Iran
| | - Zohreh Ghalavand
- b Department of Microbiology, School of Medicine , Shahid Beheshti University of Medical Sciences , Tehran , IR Iran
| | - Fatemeh Fallah
- a Pediatric Infection Research Center, Research Institute for Children Health , Shahid Beheshti University of Medical Sciences , Tehran , Iran
| | - Parisa Eslami
- c Department of Microbiology , Milad Hospital , Tehran , IR Iran
| | - Mahmoud Parvin
- d Department of Pathology, Labbafinejad Hospital , Shahid Beheshti University of Medical Sciences , Tehran , Iran
| | - Masoud Alebouyeh
- e Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases , Shahid Beheshsti University of Medical Sciences , Tehran , Iran
| | - Marjan Rashidan
- f School of medicine , Shahroud University of Medical Sciences , Shahroud , Iran
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The genome sequence of Enterococcus faecium 8S3, lactic acid–producing bacterium from Slovak cheese – bryndza with biotechnological potential. Biologia (Bratisl) 2018. [DOI: 10.2478/s11756-018-0123-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Pillay S, Zishiri OT, Adeleke MA. Prevalence of virulence genes in Enterococcus species isolated from companion animals and livestock. ACTA ACUST UNITED AC 2018; 85:e1-e8. [PMID: 30035595 PMCID: PMC6238777 DOI: 10.4102/ojvr.v85i1.1583] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 05/19/2018] [Accepted: 05/23/2018] [Indexed: 11/29/2022]
Abstract
Enterococcus species have developed from being commensal bacteria to leading pathogens that cause infections in humans and animals. The gastrointestinal tract of mammals is the normal habitat of these species. Virulence factors are proteins that are produced by the bacterium which are used to enhance their pathogenicity. The objectives of this study were to isolate Enterococcus spp. from livestock and companion animals, differentiate between the different sub-species and detect the presence of important virulence genes. Rectal and saliva swabs were collected from dogs and cats, whereas only rectal swabs were collected from cattle and cloacal swabs from chickens. Presumptive Enterococcus was selected using Bile Esculin Azide (BEA) agar, and Enterococcus species were confirmed using the polymerase chain reaction (PCR) by amplifying the tuf gene. In order to differentiate between E. faecalis and E. faecium, a multiplex PCR was used to detect the SodA gene. The genes responsible for gelatinase production (gelE) and for conjugation (ccf) were also detected using PCR. Out of 211 animal swabs, 182 (86%) were positive for the tuf gene. Overall, there were 55 isolates of E. faecalis (30%) compared to 22 isolates of E. faecium (12%). The virulence genes had a prevalence of 52% and 36% for gelE and ccf, respectively, in all animal hosts. The results demonstrated that chicken cloacal samples had the highest prevalence for E. faecalis, gelE and ccf genes compared to all the other isolates detected from other animal hosts. The results also demonstrated a statistically significant (p < 0.05) association between the prevalence of virulence genes (gelE and ccf) and animal species from which Enterococcus spp. was isolated. We provided evidence that healthy livestock and companion animals can harbour pathogenic Enterococcus that can be transferred via the food chain as well as through close association such as petting and licking of humans. This study partially demonstrated that Enterococci spp. are capable of evolving from being simple commensal bacteria to becoming pathogens that cause infection in humans and animals through the acquisition of virulence factors through mobile genetic elements.
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Affiliation(s)
- Shirwin Pillay
- School of Life Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal.
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Bressan R, Knezevich A, Monticelli J, Campanile F, Busetti M, Santagati M, Dolzani L, Milan A, Bongiorno D, Di Santolo M, Tonin EA, Stefani S, Luzzati R, Lagatolla C. Spread of Vancomycin-Resistant Enterococcus faecium Isolates Despite Validated Infection Control Measures in an Italian Hospital: Antibiotic Resistance and Genotypic Characterization of the Endemic Strain. Microb Drug Resist 2018; 24:1148-1155. [PMID: 29373085 DOI: 10.1089/mdr.2017.0314] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
An alarming increase of vancomycin-resistant Enterococcus faecium (VREfm) isolates was detected in an Italian referral hospital subjected to policies of infection control validated by the Joint Commission International. Analysis of the population structure of 122 consecutive, nonreplicate VREfm isolates collected over an 18-month period identified a single major clone that spread around the whole hospital, rapidly establishing an endemic state. It belonged to sequence type (ST) 17 and showed a highly multidrug-resistant phenotype, being resistant to all antimicrobial classes for the carriage of several resistance determinants. Furthermore, some strains with decreased susceptibility to daptomycin were detected. Eighteen out of the 122 isolates did not group in the major clone. They showed a low spreading potential inside the hospital wards, even if most of them displayed a multidrug-resistant phenotype and belonged to a hospital-adapted lineage. Causes that led to the VREfm endemic state have not been fully elucidated. However, it is conceivable that the increase in systemic antibiotic consumption and the use of selective digestive tract decontamination, including vancomycin in critically ill patients during the period before 2014, may have played a role in the ST17 clone dissemination, but additional traits conferring high fitness in hospital environment cannot be excluded.
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Affiliation(s)
- Raffaela Bressan
- 1 Department of Life Sciences, University of Trieste , Trieste, Italy
| | - Anna Knezevich
- 2 Microbiology Unit, University Hospital of Trieste , Trieste, Italy
| | - Jacopo Monticelli
- 3 Infectious Diseases Unit, University Hospital of Trieste , Trieste, Italy
| | - Floriana Campanile
- 4 Department of Biomedical and Biotechnological Sciences (BIOMETEC), University of Catania , Catania, Italy
| | - Marina Busetti
- 2 Microbiology Unit, University Hospital of Trieste , Trieste, Italy
| | - Maria Santagati
- 4 Department of Biomedical and Biotechnological Sciences (BIOMETEC), University of Catania , Catania, Italy
| | - Lucilla Dolzani
- 1 Department of Life Sciences, University of Trieste , Trieste, Italy
| | - Annalisa Milan
- 1 Department of Life Sciences, University of Trieste , Trieste, Italy
| | - Dafne Bongiorno
- 4 Department of Biomedical and Biotechnological Sciences (BIOMETEC), University of Catania , Catania, Italy
| | | | - Enrico A Tonin
- 1 Department of Life Sciences, University of Trieste , Trieste, Italy
| | - Stefania Stefani
- 4 Department of Biomedical and Biotechnological Sciences (BIOMETEC), University of Catania , Catania, Italy
| | - Roberto Luzzati
- 3 Infectious Diseases Unit, University Hospital of Trieste , Trieste, Italy .,5 Department of Medicine, Surgery and Health Sciences, University of Trieste , Trieste, Italy
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Iskandar CF, Borges F, Taminiau B, Daube G, Zagorec M, Remenant B, Leisner JJ, Hansen MA, Sørensen SJ, Mangavel C, Cailliez-Grimal C, Revol-Junelles AM. Comparative Genomic Analysis Reveals Ecological Differentiation in the Genus Carnobacterium. Front Microbiol 2017; 8:357. [PMID: 28337181 PMCID: PMC5341603 DOI: 10.3389/fmicb.2017.00357] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 02/21/2017] [Indexed: 02/01/2023] Open
Abstract
Lactic acid bacteria (LAB) differ in their ability to colonize food and animal-associated habitats: while some species are specialized and colonize a limited number of habitats, other are generalist and are able to colonize multiple animal-linked habitats. In the current study, Carnobacterium was used as a model genus to elucidate the genetic basis of these colonization differences. Analyses of 16S rRNA gene meta-barcoding data showed that C. maltaromaticum followed by C. divergens are the most prevalent species in foods derived from animals (meat, fish, dairy products), and in the gut. According to phylogenetic analyses, these two animal-adapted species belong to one of two deeply branched lineages. The second lineage contains species isolated from habitats where contact with animal is rare. Genome analyses revealed that members of the animal-adapted lineage harbor a larger secretome than members of the other lineage. The predicted cell-surface proteome is highly diversified in C. maltaromaticum and C. divergens with genes involved in adaptation to the animal milieu such as those encoding biopolymer hydrolytic enzymes, a heme uptake system, and biopolymer-binding adhesins. These species also exhibit genes for gut adaptation and respiration. In contrast, Carnobacterium species belonging to the second lineage encode a poorly diversified cell-surface proteome, lack genes for gut adaptation and are unable to respire. These results shed light on the important genomics traits required for adaptation to animal-linked habitats in generalist Carnobacterium.
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Affiliation(s)
- Christelle F. Iskandar
- Laboratoire d’Ingénierie des Biomolécules, École Nationale Supérieure d’Agronomie et des Industries Alimentaires – Université de LorraineVandoeuvre-lès-Nancy, France
| | - Frédéric Borges
- Laboratoire d’Ingénierie des Biomolécules, École Nationale Supérieure d’Agronomie et des Industries Alimentaires – Université de LorraineVandoeuvre-lès-Nancy, France
| | - Bernard Taminiau
- Laboratory of Food Microbiology, Department of Food Science, Fundamental and Applied Research for Animal and Health, University of LiègeLiège, Belgium
| | - Georges Daube
- Laboratory of Food Microbiology, Department of Food Science, Fundamental and Applied Research for Animal and Health, University of LiègeLiège, Belgium
| | | | | | - Jørgen J. Leisner
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of CopenhagenFrederiksberg, Denmark
| | - Martin A. Hansen
- Molecular Microbial Ecology Group, University of CopenhagenCopenhagen, Denmark
| | - Søren J. Sørensen
- Molecular Microbial Ecology Group, University of CopenhagenCopenhagen, Denmark
| | - Cécile Mangavel
- Laboratoire d’Ingénierie des Biomolécules, École Nationale Supérieure d’Agronomie et des Industries Alimentaires – Université de LorraineVandoeuvre-lès-Nancy, France
| | - Catherine Cailliez-Grimal
- Laboratoire d’Ingénierie des Biomolécules, École Nationale Supérieure d’Agronomie et des Industries Alimentaires – Université de LorraineVandoeuvre-lès-Nancy, France
| | - Anne-Marie Revol-Junelles
- Laboratoire d’Ingénierie des Biomolécules, École Nationale Supérieure d’Agronomie et des Industries Alimentaires – Université de LorraineVandoeuvre-lès-Nancy, France
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15
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Morroni G, Di Cesare A, Di Sante L, Brenciani A, Vignaroli C, Pasquaroli S, Giovanetti E, Sabatino R, Rossi L, Magnani M, Biavasco F. Enterococcus faecium ST17 from Coastal Marine Sediment Carrying Transferable Multidrug Resistance Plasmids. Microb Drug Resist 2016; 22:523-530. [PMID: 26982016 DOI: 10.1089/mdr.2015.0222] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The multidrug-resistant Enterococcus faecium 17i48, sequence type 17, from marine sediment, carrying erm(B), tet(M), and tet(L) genes, was analyzed for the presence of antibiotic resistance plasmids and for the ability to transfer resistance genes. The strain was found to harbor the replicon type (repA) of pRE25, pRUM, pHTβ, and the axe-txe toxin-antitoxin (TA) system. In mating experiments, tet(M) and tet(L) were cotransferred with the repApRE25, whereas erm(B) was consistently cotransferred with the axe-txe and repApRUM, suggesting that tetracycline and erythromycin resistance genes were carried on different elements both transferable by conjugation, likely via pHTβ-mediated mobilization. Hybridization and PCR mapping demonstrated that tet(M) and tet(L) were located in tandem on a pDO1-like plasmid that also carried the repApRE25, whereas erm(B) was carried by a pRUM-like plasmid. Sequencing of the latter plasmid showed a high nucleotide identity with pRUM and the presence of cat, aadE, sat4, and a complete aphA resistance genes. These findings show that the genetic features of E. faecium 17i48 are consistent with a hospital-adapted clone and suggest that antibiotic resistance may spread in the environment, also in the absence of antibiotic pressure, due to TA system plasmid maintenance.
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Affiliation(s)
- Gianluca Morroni
- 1 Department of Biomedical Sciences and Public Health, Polytechnic University of Marche , Ancona, Italy
| | - Andrea Di Cesare
- 2 Department of Life and Environmental Sciences, Polytechnic University of Marche , Ancona, Italy
| | - Laura Di Sante
- 2 Department of Life and Environmental Sciences, Polytechnic University of Marche , Ancona, Italy
| | - Andrea Brenciani
- 1 Department of Biomedical Sciences and Public Health, Polytechnic University of Marche , Ancona, Italy
| | - Carla Vignaroli
- 2 Department of Life and Environmental Sciences, Polytechnic University of Marche , Ancona, Italy
| | - Sonia Pasquaroli
- 2 Department of Life and Environmental Sciences, Polytechnic University of Marche , Ancona, Italy
| | - Eleonora Giovanetti
- 2 Department of Life and Environmental Sciences, Polytechnic University of Marche , Ancona, Italy
| | - Raffaella Sabatino
- 3 Biochemistry and Molecular Biology Section, Department of Biomolecular Sciences, University of Urbino "Carlo Bo," Urbino, Italy
| | - Luigia Rossi
- 3 Biochemistry and Molecular Biology Section, Department of Biomolecular Sciences, University of Urbino "Carlo Bo," Urbino, Italy
| | - Mauro Magnani
- 3 Biochemistry and Molecular Biology Section, Department of Biomolecular Sciences, University of Urbino "Carlo Bo," Urbino, Italy
| | - Francesca Biavasco
- 2 Department of Life and Environmental Sciences, Polytechnic University of Marche , Ancona, Italy
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16
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Lyons C, Raustad N, Bustos MA, Shiaris M. Incidence of Type II CRISPR1-Cas Systems in Enterococcus Is Species-Dependent. PLoS One 2015; 10:e0143544. [PMID: 26600384 PMCID: PMC4658022 DOI: 10.1371/journal.pone.0143544] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 11/05/2015] [Indexed: 12/19/2022] Open
Abstract
CRISPR-Cas systems, which obstruct both viral infection and incorporation of mobile genetic elements by horizontal transfer, are a specific immune response common to prokaryotes. Antiviral protection by CRISPR-Cas comes at a cost, as horizontally-acquired genes may increase fitness and provide rapid adaptation to habitat change. To date, investigations into the prevalence of CRISPR have primarily focused on pathogenic and clinical bacteria, while less is known about CRISPR dynamics in commensal and environmental species. We designed PCR primers and coupled these with DNA sequencing of products to detect and characterize the presence of cas1, a universal CRISPR-associated gene and proxy for the Type II CRISPR1-Cas system, in environmental and non-clinical Enterococcus isolates. CRISPR1-cas1 was detected in approximately 33% of the 275 strains examined, and differences in CRISPR1 carriage between species was significant. Incidence of cas1 in E. hirae was 73%, nearly three times that of E. faecalis (23.6%) and 10 times more frequent than in E. durans (7.1%). Also, this is the first report of CRISPR1 presence in E. durans, as well as in the plant-associated species E. casseliflavus and E. sulfureus. Significant differences in CRISPR1-cas1 incidence among Enterococcus species support the hypothesis that there is a tradeoff between protection and adaptability. The differences in the habitats of enterococcal species may exert varying selective pressure that results in a species-dependent distribution of CRISPR-Cas systems.
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Affiliation(s)
- Casandra Lyons
- Biology Department, University of Massachusetts Boston, Boston, Massachusetts, United States of America
| | - Nicole Raustad
- Biology Department, University of Massachusetts Boston, Boston, Massachusetts, United States of America
| | - Mario A. Bustos
- Biology Department, University of Massachusetts Boston, Boston, Massachusetts, United States of America
| | - Michael Shiaris
- Biology Department, University of Massachusetts Boston, Boston, Massachusetts, United States of America
- * E-mail:
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17
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Al-Badah AS, Ibrahim AS, Al-Salamah AA, Ibrahim SSS. Clonal diversity and antimicrobial resistance of Enterococcus faecalis isolated from endodontic infections. ELECTRON J BIOTECHN 2015. [DOI: 10.1016/j.ejbt.2015.03.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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18
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Alternative strategies for proof-of-principle studies of antibacterial agents. Antimicrob Agents Chemother 2014; 58:4257-63. [PMID: 24867989 DOI: 10.1128/aac.02473-14] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The proof that a new antibacterial agent is not only active in vitro but also effective in vivo under clinically relevant conditions is currently provided (i) by using appropriate nonclinical models of infection and pharmacokinetic-pharmacodynamic (PK-PD) analysis providing evidence of the likelihood of clinical efficacy and (ii) by examining the study drug in exploratory clinical trials, as well as dose and schedule finding during phase II of clinical development. This approach is both time-consuming and costly. Furthermore, PK-PD targets for any novel antibacterial agent cannot be derived from studies with experimental animals. Therefore, alternative strategies have to be identified to prove the principle that a novel antibacterial agent is active under clinically relevant conditions. This review summarizes evidence that the quantitative analysis of shifts in the viable counts of pathogens in infected patients or the evaluation of the PD effect of an investigational agent on indicator organisms of the human resident microflora or colonizers of healthy volunteers, if paralleled with PK monitoring of serum and the target site, provides an alternative to a classical proof-of-principle study in the course of a phase II study program.
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19
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Strickertsson JAB, Desler C, Rasmussen LJ. Impact of bacterial infections on aging and cancer: impairment of DNA repair and mitochondrial function of host cells. Exp Gerontol 2014; 56:164-74. [PMID: 24704713 DOI: 10.1016/j.exger.2014.03.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 03/19/2014] [Accepted: 03/26/2014] [Indexed: 02/06/2023]
Abstract
The commensal floras that inhabit the gastrointestinal tract play critical roles in immune responses, energy metabolism, and even cancer prevention. Pathogenic and out of place commensal bacteria, can however have detrimental effects on the host, by introducing genomic instability and mitochondrial dysfunction, which are hallmarks of both aging and cancer. Helicobacter pylori and Enterococcus faecalis are bacteria of the gastrointestinal tract that have been demonstrated to affect these two hallmarks. These, and other bacteria, have been shown to decrease the transcription and translation of essential DNA repair subunits of major DNA repair pathways and increase production of reactive oxygen species (ROS). Defects in DNA repair cause mutations and genomic instability and are found in several cancers as well as in progeroid syndromes. This review describes our contemporary view on how bacterial infections impact DNA repair and damage, and the consequence on the mitochondrial and nuclear genomes. We argue that in the gastrointestinal tract, these mechanisms can contribute to tumorigenesis as well as cellular aging of the digestive system.
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Affiliation(s)
- Jesper A B Strickertsson
- Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, DK-2200 Copenhagen, Denmark
| | - Claus Desler
- Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, DK-2200 Copenhagen, Denmark
| | - Lene Juel Rasmussen
- Center for Healthy Aging, Department of Cellular and Molecular Medicine, University of Copenhagen, DK-2200 Copenhagen, Denmark.
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20
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Weigand MR, Ashbolt NJ, Konstantinidis KT, Santo Domingo JW. Genome sequencing reveals the environmental origin of enterococci and potential biomarkers for water quality monitoring. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:3707-3714. [PMID: 24571132 DOI: 10.1021/es4054835] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Enterococci are common members of the gut microbiome and their ease of culturing has facilitated worldwide use as indicators of fecal pollution of waters. However, enterococci were recently shown to persist in environmental habitats, often in the absence of fecal input, potentially confounding water quality assays. Toward resolving this issue and providing a more complete picture of natural enterococci diversity, 11 isolates of Enterococcus faecalis recovered from freshwater watersheds (environmental) were sequenced and compared to 59 available enteric genomes. Phenotypically and phylogenetically the environmental E. faecalis were indistinguishable from their enteric counterparts. However, distinct environmental- and enteric-associated gene signatures, encoding mostly accessory nutrient utilization pathways, were detected among the variable genes. Specifically, a nickel uptake operon was over-represented in environmental genomes, while genes for utilization of sugars thought to be abundant in the gut such as xylose were over-represented in enteric genomes. The distribution and phylogeny of these identified signatures suggest that ancestors of E. faecalis resided in extra-enteric habitats, challenging the prevailing commensal view of enterococci ecology. Thus, habitat-associated gene content changes faster than core genome phylogeny and may include biomarkers for reliably detecting fecal contaminants for improved microbial water quality monitoring.
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Affiliation(s)
- Michael R Weigand
- School of Civil and Environmental Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
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21
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Radhouani H, Silva N, Poeta P, Torres C, Correia S, Igrejas G. Potential impact of antimicrobial resistance in wildlife, environment and human health. Front Microbiol 2014; 5:23. [PMID: 24550896 PMCID: PMC3913889 DOI: 10.3389/fmicb.2014.00023] [Citation(s) in RCA: 136] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Accepted: 01/14/2014] [Indexed: 11/13/2022] Open
Abstract
Given the significant spatial and temporal heterogeneity in antimicrobial resistance distribution and the factors that affect its evolution, dissemination, and persistence, it is important to highlight that antimicrobial resistance must be viewed as an ecological problem. Monitoring the resistance prevalence of indicator bacteria such as Escherichia coli and enterococci in wild animals makes it possible to show that wildlife has the potential to serve as an environmental reservoir and melting pot of bacterial resistance. These researchers address the issue of antimicrobial-resistant microorganism proliferation in the environment and the related potential human health and environmental impact.
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Affiliation(s)
- Hajer Radhouani
- Institute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes and Alto Douro Vila Real, Portugal ; Department of Genetics and Biotechnology, University of Trás-os-Montes and Alto Douro Vila Real, Portugal ; Animal and Veterinary Research Centre, University of Trás-os-Montes and Alto Douro Vila Real, Portugal ; Veterinary Science Department, University of Trás-os-Montes and Alto Douro Vila Real, Portugal
| | - Nuno Silva
- Animal and Veterinary Research Centre, University of Trás-os-Montes and Alto Douro Vila Real, Portugal
| | - Patrícia Poeta
- Animal and Veterinary Research Centre, University of Trás-os-Montes and Alto Douro Vila Real, Portugal ; Veterinary Science Department, University of Trás-os-Montes and Alto Douro Vila Real, Portugal
| | - Carmen Torres
- Biochemistry and Molecular Biology Area, University of La Rioja Logroño, Spain
| | - Susana Correia
- Institute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes and Alto Douro Vila Real, Portugal ; Department of Genetics and Biotechnology, University of Trás-os-Montes and Alto Douro Vila Real, Portugal ; Animal and Veterinary Research Centre, University of Trás-os-Montes and Alto Douro Vila Real, Portugal ; Veterinary Science Department, University of Trás-os-Montes and Alto Douro Vila Real, Portugal
| | - Gilberto Igrejas
- Institute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes and Alto Douro Vila Real, Portugal ; Department of Genetics and Biotechnology, University of Trás-os-Montes and Alto Douro Vila Real, Portugal
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22
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Devirgiliis C, Zinno P, Perozzi G. Update on antibiotic resistance in foodborne Lactobacillus and Lactococcus species. Front Microbiol 2013; 4:301. [PMID: 24115946 PMCID: PMC3792357 DOI: 10.3389/fmicb.2013.00301] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2013] [Accepted: 09/19/2013] [Indexed: 12/21/2022] Open
Abstract
Lactobacilli represent a major Lactic Acid Bacteria (LAB) component within the complex microbiota of fermented foods obtained from meat, dairy, and vegetable sources. Lactococci, on the other hand, are typical of milk and fermented dairy products, which in turn represent the vast majority of fermented foods. As is the case for all species originating from the environment, foodborne lactobacilli and lactococci consist of natural, uncharacterized strains, whose biodiversity depends on geographical origin, seasonality, animal feeding/plant growth conditions. Although a few species of opportunistic pathogens have been described, lactobacilli and lactococci are mostly non-pathogenic, Gram-positive bacteria displaying probiotic features. Since antibiotic resistant (AR) strains do not constitute an immediate threat to human health, scientific interest for detailed studies on AR genes in these species has been greatly hindered. However, increasing evidence points at a crucial role for foodborne LAB as reservoir of potentially transmissible AR genes, underlining the need for further, more detailed studies aimed at identifying possible strategies to avoid AR spread to pathogens through fermented food consumption. The availability of a growing number of sequenced bacterial genomes has been very helpful in identifying the presence/distribution of mobile elements associated with AR genes, but open questions and knowledge gaps still need to be filled, highlighting the need for systematic and datasharing approaches to implement both surveillance and mechanistic studies on transferability of AR genes. In the present review we report an update of the recent literature on AR in lactobacilli and lactococci following the 2006 EU-wide ban of the use of antibiotics as feed additives in animal farming, and we discuss the limits of the present knowledge in evaluating possible risks for human health.
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Affiliation(s)
- Chiara Devirgiliis
- CRA-NUT, Food and Nutrition Research Center, Agricultural Research Council Roma, Italy
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23
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Werner G, Coque TM, Franz CMAP, Grohmann E, Hegstad K, Jensen L, van Schaik W, Weaver K. Antibiotic resistant enterococci-tales of a drug resistance gene trafficker. Int J Med Microbiol 2013; 303:360-79. [PMID: 23602510 DOI: 10.1016/j.ijmm.2013.03.001] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Enterococci have been recognized as important hospital-acquired pathogens in recent years, and isolates of E. faecalis and E. faecium are the third- to fourth-most prevalent nosocomial pathogen worldwide. Acquired resistances, especially against penicilin/ampicillin, aminoglycosides (high-level) and glycopeptides are therapeutically important and reported in increasing numbers. On the other hand, isolates of E. faecalis and E. faecium are commensals of the intestines of humans, many vertebrate and invertebrate animals and may also constitute an active part of the plant flora. Certain enterococcal isolates are used as starter cultures or supplements in food fermentation and food preservation. Due to their preferred intestinal habitat, their wide occurrence, robustness and ease of cultivation, enterococci are used as indicators for fecal pollution assessing hygiene standards for fresh- and bathing water and they serve as important key indicator bacteria for various veterinary and human resistance surveillance systems. Enterococci are widely prevalent and genetically capable of acquiring, conserving and disseminating genetic traits including resistance determinants among enterococci and related Gram-positive bacteria. In the present review we aimed at summarizing recent advances in the current understanding of the population biology of enterococci, the role mobile genetic elements including plasmids play in shaping the population structure and spreading resistance. We explain how these elements could be classified and discuss mechanisms of plasmid transfer and regulation and the role and cross-talk of enterococcal isolates from food and food animals to humans.
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Affiliation(s)
- Guido Werner
- National Reference Centre for Stapyhlococci and Enterococci, Division of Nosocomial Pathogens and Antibiotic Resistances, Robert Koch Institute, Wernigerode Branch, Burgstr. 37, 38855 Wernigerode, Germany.
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24
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Stefani S. Analyzing possible intersections in the resistome among human, animal, and environment matrices. Front Microbiol 2012; 3:418. [PMID: 23227025 PMCID: PMC3514611 DOI: 10.3389/fmicb.2012.00418] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Accepted: 11/20/2012] [Indexed: 11/18/2022] Open
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25
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Molecular characterization of vancomycin-resistant Enterococcus spp. clinical isolates recovered from hospitalized patients among several medical institutions in China. Diagn Microbiol Infect Dis 2012; 74:399-403. [DOI: 10.1016/j.diagmicrobio.2012.09.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Revised: 09/06/2012] [Accepted: 09/07/2012] [Indexed: 01/20/2023]
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