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Torres-Quintero MC, Santamaría RI, Martínez-Flores I, Bustos P, Girard L, Cevallos MÁ, Rodríguez-Sánchez C, González V. Role of core lipopolysaccharide biosynthetic genes in the infection and adsorption of broad-host-range bacteriophages of Rhizobium etli. Microbiol Res 2024; 285:127766. [PMID: 38788349 DOI: 10.1016/j.micres.2024.127766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 05/07/2024] [Accepted: 05/13/2024] [Indexed: 05/26/2024]
Abstract
In this study, we examined the role of the lipopolysaccharide (LPS) core of Rhizobium etli in facilitating the adsorption and infection of phages with broad host range. When the plasmid-encoded LPS biosynthesis genes, wreU and wreV, were disrupted, distinct and contrasting effects on phage infection were observed. The wreU mutant strains exhibited wild-type adsorption and infection properties, whereas the wreV mutant demonstrated resistance to phage infection, but retained the capacity to adsorb phages. Complementation of the wreV mutant strains with a recombinant plasmid containing the wreU and wreV, restored the susceptibility to the phages. However, the presence of this recombinant plasmid in a strain devoid of the native lps-encoding plasmid was insufficient to restore phage susceptibility. These results suggest that the absence of wreV impedes the proper assembly of the complete LPS core, potentially affecting the formation of UDP-KdgNAg or KDO precursors for the O-antigen. In addition, a protein not yet identified, but residing in the native lps-encoding plasmid, may be necessary for complete phage infection.
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Affiliation(s)
- Mary Carmen Torres-Quintero
- Programa de Genómica Evolutiva, Centro de Ciencias Genómicas, UNAM, Av. Universidad s/n, Col. Chamilpa C.P. 62212, Cuernavaca, Mor, Apdo 565-A, Mexico
| | - Rosa Isela Santamaría
- Programa de Genómica Evolutiva, Centro de Ciencias Genómicas, UNAM, Av. Universidad s/n, Col. Chamilpa C.P. 62212, Cuernavaca, Mor, Apdo 565-A, Mexico
| | - Irma Martínez-Flores
- Programa de Genómica Evolutiva, Centro de Ciencias Genómicas, UNAM, Av. Universidad s/n, Col. Chamilpa C.P. 62212, Cuernavaca, Mor, Apdo 565-A, Mexico
| | - Patricia Bustos
- Programa de Genómica Evolutiva, Centro de Ciencias Genómicas, UNAM, Av. Universidad s/n, Col. Chamilpa C.P. 62212, Cuernavaca, Mor, Apdo 565-A, Mexico
| | - Lourdes Girard
- Programa de Microbiología Genómica, Centro de Ciencias Genómicas, UNAM, Av. Universidad s/n, Col. Chamilpa C.P. 62212, Cuernavaca, Mor, Apdo 565-A, Mexico
| | - Miguel Ángel Cevallos
- Programa de Genómica Evolutiva, Centro de Ciencias Genómicas, UNAM, Av. Universidad s/n, Col. Chamilpa C.P. 62212, Cuernavaca, Mor, Apdo 565-A, Mexico
| | - César Rodríguez-Sánchez
- Programa de Genómica Evolutiva, Centro de Ciencias Genómicas, UNAM, Av. Universidad s/n, Col. Chamilpa C.P. 62212, Cuernavaca, Mor, Apdo 565-A, Mexico
| | - Víctor González
- Programa de Genómica Evolutiva, Centro de Ciencias Genómicas, UNAM, Av. Universidad s/n, Col. Chamilpa C.P. 62212, Cuernavaca, Mor, Apdo 565-A, Mexico.
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Ding Y, Nan Y, Qiu Y, Niu D, Stanford K, Holley R, McAllister T, Narváez‐Bravo C. Use of a phage cocktail to reduce the numbers of seven
Escherichia coli
strains belonging to different
STEC
serogroups applied to fresh produce and seeds. J Food Saf 2023. [DOI: 10.1111/jfs.13044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Yiran Ding
- Food and Human Nutritional Sciences University of Manitoba Winnipeg Manitoba Canada
| | - Yuchen Nan
- Food and Human Nutritional Sciences University of Manitoba Winnipeg Manitoba Canada
| | - Yang Qiu
- Food and Human Nutritional Sciences University of Manitoba Winnipeg Manitoba Canada
| | - Dongyan Niu
- Ecosystem & Public Health University of Calgary Calgary Alberta Canada
| | - Kim Stanford
- Department of Biological Sciences University of Lethbridge Lethbridge Canada
| | - Rick Holley
- Food and Human Nutritional Sciences University of Manitoba Winnipeg Manitoba Canada
| | - Tim McAllister
- Food and Human Nutritional Sciences University of Manitoba Winnipeg Manitoba Canada
- Ecosystem & Public Health University of Calgary Calgary Alberta Canada
- Department of Biological Sciences University of Lethbridge Lethbridge Canada
- Agriculture and Agri‐Food Canada Lethbridge Research and Development Centre Lethbridge Alberta Canada
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Debray R, De Luna N, Koskella B. Historical contingency drives compensatory evolution and rare reversal of phage resistance. Mol Biol Evol 2022; 39:6673247. [PMID: 35994371 PMCID: PMC9447851 DOI: 10.1093/molbev/msac182] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Bacteria and lytic viruses (phages) engage in highly dynamic coevolutionary interactions over time, yet we have little idea of how transient selection by phages might shape the future evolutionary trajectories of their host populations. To explore this question, we generated genetically diverse phage-resistant mutants of the bacterium Pseudomonas syringae. We subjected the panel of mutants to prolonged experimental evolution in the absence of phages. Some populations re-evolved phage sensitivity, whereas others acquired compensatory mutations that reduced the costs of resistance without altering resistance levels. To ask whether these outcomes were driven by the initial genetic mechanisms of resistance, we next evolved independent replicates of each individual mutant in the absence of phages. We found a strong signature of historical contingency: some mutations were highly reversible across replicate populations, whereas others were highly entrenched. Through whole-genome sequencing of bacteria over time, we also found that populations with the same resistance gene acquired more parallel sets of mutations than populations with different resistance genes, suggesting that compensatory adaptation is also contingent on how resistance initially evolved. Our study identifies an evolutionary ratchet in bacteria–phage coevolution and may explain previous observations that resistance persists over time in some bacterial populations but is lost in others. We add to a growing body of work describing the key role of phages in the ecological and evolutionary dynamics of their host communities. Beyond this specific trait, our study provides a new insight into the genetic architecture of historical contingency, a crucial component of interpreting and predicting evolution.
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Affiliation(s)
- Reena Debray
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA, USA
| | - Nina De Luna
- Department of Immunology, Pennsylvania State University, State College, PA, USA
| | - Britt Koskella
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA, USA.,Chan Zuckerberg BioHub, San Francisco, CA, USA
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Sharma RS, Karmakar S, Kumar P, Mishra V. Application of filamentous phages in environment: A tectonic shift in the science and practice of ecorestoration. Ecol Evol 2019; 9:2263-2304. [PMID: 30847110 PMCID: PMC6392359 DOI: 10.1002/ece3.4743] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 08/25/2018] [Accepted: 10/30/2018] [Indexed: 02/06/2023] Open
Abstract
Theories in soil biology, such as plant-microbe interactions and microbial cooperation and antagonism, have guided the practice of ecological restoration (ecorestoration). Below-ground biodiversity (bacteria, fungi, invertebrates, etc.) influences the development of above-ground biodiversity (vegetation structure). The role of rhizosphere bacteria in plant growth has been largely investigated but the role of phages (bacterial viruses) has received a little attention. Below the ground, phages govern the ecology and evolution of microbial communities by affecting genetic diversity, host fitness, population dynamics, community composition, and nutrient cycling. However, few restoration efforts take into account the interactions between bacteria and phages. Unlike other phages, filamentous phages are highly specific, nonlethal, and influence host fitness in several ways, which make them useful as target bacterial inocula. Also, the ease with which filamentous phages can be genetically manipulated to express a desired peptide to track and control pathogens and contaminants makes them useful in biosensing. Based on ecology and biology of filamentous phages, we developed a hypothesis on the application of phages in environment to derive benefits at different levels of biological organization ranging from individual bacteria to ecosystem for ecorestoration. We examined the potential applications of filamentous phages in improving bacterial inocula to restore vegetation and to monitor changes in habitat during ecorestoration and, based on our results, recommend a reorientation of the existing framework of using microbial inocula for such restoration and monitoring. Because bacterial inocula and biomonitoring tools based on filamentous phages are likely to prove useful in developing cost-effective methods of restoring vegetation, we propose that filamentous phages be incorporated into nature-based restoration efforts and that the tripartite relationship between phages, bacteria, and plants be explored further. Possible impacts of filamentous phages on native microflora are discussed and future areas of research are suggested to preclude any potential risks associated with such an approach.
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Affiliation(s)
- Radhey Shyam Sharma
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental StudiesUniversity of DelhiDelhiIndia
| | - Swagata Karmakar
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental StudiesUniversity of DelhiDelhiIndia
| | - Pankaj Kumar
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental StudiesUniversity of DelhiDelhiIndia
| | - Vandana Mishra
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental StudiesUniversity of DelhiDelhiIndia
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Rathi M, Nandabalan YK. Copper-tolerant rhizosphere bacteria-characterization and assessment of plant growth promoting factors. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:9723-9733. [PMID: 28251535 DOI: 10.1007/s11356-017-8624-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 02/09/2017] [Indexed: 06/06/2023]
Abstract
Remediation of heavy metal contaminated soil is a major problem or concern worldwide. Heavy metal accumulation in the soil is increasing day by day by industries, mines, agriculture, fuel combustion and municipal waste discharge. Such contaminated soils harbour a large number of resistant microbial populations. Screening and isolation of such microbes would be utilized for natural remediation of metal contaminated soils. Therefore, in the present study, highly copper-tolerant bacteria from rhizosphere soil of Cynodon dactylon grown in brass effluent contaminated soil were isolated and assessed for plant growth promoting factors. A total of 61 isolates were isolated from the rhizosphere of three contaminated sites. Six highly copper-tolerant isolates named as MYS1, MYS2, MYS3, MYS4, MYS5 and MYS6 were isolated through enrichment in copper containing nutrient broth. 16S rRNA analysis revealed that the isolates were from genera Stenotrophomonas and Brevundimonas and belong to classes Alpha Proteobacteriacea and Gamma Proteobacteriacea, respectively. Strain MYS1, MYS2 and MYS4 showed 95-99% similarity with Stenotrophomonas acidaminiphila, strain MYS3 and MYS5 showed 99 and 97% similarity with Stenotrophomonas maltophilia and Stenotrophomonas sp. Strain MYS6 showed 94% similarity with Brevundimonas diminuta. All the rhizobacteria showed plant growth promoting traits such as production of siderophores, indole acetic acid (IAA), phosphate solubilization and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity. From this study, we can conclude that all the isolates possess copper resistance and potential for phytoremediation of copper polluted soils.
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Affiliation(s)
- Manohari Rathi
- Centre for Environmental Science and Technology, School of Environment and Earth Sciences, Central University of Punjab, Bathinda, 151001, India
| | - Yogalakshmi Kadapakkam Nandabalan
- Centre for Environmental Science and Technology, School of Environment and Earth Sciences, Central University of Punjab, Bathinda, 151001, India.
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Sharma M, Mishra V, Rau N, Sharma RS. Increased iron-stress resilience of maize through inoculation of siderophore-producingArthrobacter globiformisfrom mine. J Basic Microbiol 2015; 56:719-35. [DOI: 10.1002/jobm.201500450] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 10/24/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Meenakshi Sharma
- Department of Environmental Studies, Bioresources Environmental Biotechnology Laboratory; Center for Environmental Management of Degraded Ecosystems; University of Delhi; Delhi-110007 India
| | - Vandana Mishra
- Department of Environmental Studies, Bioresources Environmental Biotechnology Laboratory; Center for Environmental Management of Degraded Ecosystems; University of Delhi; Delhi-110007 India
| | - Nupur Rau
- Department of Environmental Studies, Bioresources Environmental Biotechnology Laboratory; Center for Environmental Management of Degraded Ecosystems; University of Delhi; Delhi-110007 India
| | - Radhey Shyam Sharma
- Department of Environmental Studies, Bioresources Environmental Biotechnology Laboratory; Center for Environmental Management of Degraded Ecosystems; University of Delhi; Delhi-110007 India
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Molina-Sánchez MD, López-Contreras JA, Toro N, Fernández-López M. Genomic characterization of Sinorhizobium meliloti AK21, a wild isolate from the Aral Sea Region. SPRINGERPLUS 2015; 4:259. [PMID: 26090306 PMCID: PMC4468178 DOI: 10.1186/s40064-015-1062-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 05/26/2015] [Indexed: 11/10/2022]
Abstract
The symbiotic, nitrogen-fixing bacterium Sinorhizobium meliloti has been widely studied due to its ability to improve crop yields through direct interactions with leguminous plants. S. meliloti AK21 is a wild type strain that forms nodules on Medicago plants in saline and drought conditions in the Aral Sea Region. The aim of this work was to establish the genetic similarities and differences between S. meliloti AK21 and the reference strain S. meliloti 1021. Comparative genome hybridization with the model reference strain S. meliloti 1021 yielded 365 variable genes, grouped into 11 regions in the three main replicons in S. meliloti AK21. The most extensive regions of variability were found in the symbiotic plasmid pSymA, which also contained the largest number of orthologous and polymorphic sequences identified by suppression subtractive hybridization. This procedure identified a large number of divergent sequences and others without homology in the databases, the further investigation of which could provide new insight into the alternative metabolic pathways present in S. meliloti AK21. We identified a plasmid replication module from the repABC replicon family, together with plasmid mobilization-related genes (traG and a VirB9-like protein), which suggest that this indigenous isolate harbors an accessory plasmid. Furthermore, the transcriptomic profiles reflected differences in gene content and regulation between S. meliloti AK21 and S. meliloti 1021 (ExpR and PhoB regulons), but provided evidence for an as yet unknown, alternative mechanism involving activation of the cbb3 terminal oxidase. Finally, phenotypic microarrays characterization revealed a greater versatility of substrate use and chemical degradation than for S. meliloti 1021.
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Affiliation(s)
- María Dolores Molina-Sánchez
- Grupo de Ecología Genética, Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, Calle Profesor Albareda 1, 18008 Granada, Spain
| | - José Antonio López-Contreras
- Grupo de Ecología Genética, Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, Calle Profesor Albareda 1, 18008 Granada, Spain
| | - Nicolás Toro
- Grupo de Ecología Genética, Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, Calle Profesor Albareda 1, 18008 Granada, Spain
| | - Manuel Fernández-López
- Grupo de Ecología Genética, Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, Calle Profesor Albareda 1, 18008 Granada, Spain
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Sharma RS, Mishra V, Mohmmed A, Babu CR. Variations in Outer-membrane Characteristics of Two Stem-nodulating Bacteria of Sesbania rostrata and its Role in Tolerance Towards Diverse Stress. Curr Microbiol 2011; 63:81-6. [DOI: 10.1007/s00284-011-9946-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2011] [Accepted: 04/25/2011] [Indexed: 11/28/2022]
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Pasić L, Rodriguez-Mueller B, Martin-Cuadrado AB, Mira A, Rohwer F, Rodriguez-Valera F. Metagenomic islands of hyperhalophiles: the case of Salinibacter ruber. BMC Genomics 2009; 10:570. [PMID: 19951421 PMCID: PMC2800850 DOI: 10.1186/1471-2164-10-570] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2009] [Accepted: 12/01/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Saturated brines are extreme environments of low diversity. Salinibacter ruber is the only bacterium that inhabits this environment in significant numbers. In order to establish the extent of genetic diversity in natural populations of this microbe, the genomic sequence of reference strain DSM 13855 was compared to metagenomic fragments recovered from climax saltern crystallizers and obtained with 454 sequencing technology. This kind of analysis reveals the presence of metagenomic islands, i.e. highly variable regions among the different lineages in the population. RESULTS Three regions of the sequenced isolate were scarcely represented in the metagenome thus appearing to vary among co-occurring S. ruber cells. These metagenomic islands showed evidence of extensive genomic corruption with atypically low GC content, low coding density, high numbers of pseudogenes and short hypothetical proteins. A detailed analysis of island gene content showed that the genes in metagenomic island 1 code for cell surface polysaccharides. The strain-specific genes of metagenomic island 2 were found to be involved in biosynthesis of cell wall polysaccharide components. Finally, metagenomic island 3 was rich in DNA related enzymes. CONCLUSION The genomic organisation of S. ruber variable genomic regions showed a number of convergences with genomic islands of marine microbes studied, being largely involved in variable cell surface traits. This variation at the level of cell envelopes in an environment devoid of grazing pressure probably reflects a global strategy of bacteria to escape phage predation.
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Affiliation(s)
- Lejla Pasić
- Evolutionary Genomics Group, División de Microbiología, Universidad Miguel Hernández, Apartado 18, San Juan 03550, Alicante, Spain.
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Rodriguez-Valera F, Martin-Cuadrado AB, Rodriguez-Brito B, Pasić L, Thingstad TF, Rohwer F, Mira A. Explaining microbial population genomics through phage predation. Nat Rev Microbiol 2009; 7:828-36. [PMID: 19834481 DOI: 10.1038/nrmicro2235] [Citation(s) in RCA: 439] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The remarkable differences that have been detected by metagenomics in the genomes of strains of the same bacterial species are difficult to reconcile with the widely accepted paradigm that periodic selection within bacterial populations will regularly purge genomic diversity by clonal replacement. We have found that many of the genes that differ between strains affect regions that are potential phage recognition targets. We therefore propose the constant-diversity dynamics model, in which the diversity of prokaryotic populations is preserved by phage predation. We provide supporting evidence for this model from metagenomics, mathematical analysis and computer simulations. Periodic selection and phage predation dynamics are not mutually exclusive; we compare their predictions to shed light on the ecological circumstances under which each type of dynamics could predominate.
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Affiliation(s)
- Francisco Rodriguez-Valera
- Departmento de Producción Vegetal y Microbiología, Universidad Miguel Hernandez, San Juan de Alicante, Spain
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Niu YD, Johnson RP, Xu Y, McAllister TA, Sharma R, Louie M, Stanford K. Host range and lytic capability of four bacteriophages against bovine and clinical human isolates of Shiga toxin-producing Escherichia coli O157:H7. J Appl Microbiol 2009; 107:646-56. [PMID: 19302306 DOI: 10.1111/j.1365-2672.2009.04231.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
AIMS To evaluate host range and lytic capability of four bacteriophages (rV5, wV7, wV8 and wV11) against Escherichia coli O157:H7 (STEC O157:H7) from cattle and humans. METHODS AND RESULTS Four hundred and twenty-two STEC O157:H7 isolates (297 bovine; 125 human) were obtained in Alberta, Canada. The four phages were serially diluted and incubated for 5 h with overnight cultures of STEC O157:H7 to estimate their multiplicity of infection (MOI). All bovine STEC O157:H7 were subjected to pulsed-field gel electrophoresis (PFGE) and phage typing (PT). Phage wV7 lysed all human and bovine isolates irrespective of PFGE genotype or PT phenotype and exhibited the lowest MOI (0.004-0.006, P < 0.0001) of all phages. Phages rV5 and wV11 exhibited a lower MOI (0.002-0.04, P < 0.0001) than did phage wV8 (25-29) and they had a narrower host range than wV7 or wV8. Phages rV5, wV11 and wV8 lysed 342 (81.0%), 321 (76.1%) and 407 (96.4%), respectively, of the 422 isolates. Susceptibility of bovine STEC O157:H7 to rV5, w11 and wV8 was influenced by PFGE genotype and/or PT phenotype. CONCLUSIONS Phages exhibited activity against the majority of bovine and human STEC O157:H7 isolates. PFGE genotype and/or PT phenotype of the host-target influenced their vulnerability to phage attack. Susceptibility of bovine STEC O157:H7 to phage may also differ among farms. Both lytic capability and host range should be considered in the selection of therapeutic phage for on-farm control of STEC O157:H7. SIGNIFICANCE AND IMPACT OF THE STUDY The present work indicates that a four-phage cocktail should be equally effective at mitigating STEC O157:H7 isolates both of bovine and of human origin. Given that some STEC O157:H7 exhibited resistance to some but not all phages, a phage cocktail is the logical approach to efficacious on-farm therapy.
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Affiliation(s)
- Y D Niu
- Department of Bioscience and Biotechnology, Dalian University of Technology, Dalian, Liaoning, China
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Comparative genomics of two ecotypes of the marine planktonic copiotroph Alteromonas macleodii suggests alternative lifestyles associated with different kinds of particulate organic matter. ISME JOURNAL 2008; 2:1194-212. [DOI: 10.1038/ismej.2008.74] [Citation(s) in RCA: 161] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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