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Jolicoeur AP, Lemay ML, Beaubien E, Bélanger J, Bergeron C, Bourque-Leblanc F, Doré L, Dupuis MÈ, Fleury A, Garneau JE, Labrie SJ, Labrie S, Lacasse G, Lamontagne-Drolet M, Lessard-Hurtubise R, Martel B, Menasria R, Morin-Pelchat R, Pageau G, Samson JE, Rousseau GM, Tremblay DM, Duquenne M, Lamoureux M, Moineau S. Longitudinal Study of Lactococcus Phages in a Canadian Cheese Factory. Appl Environ Microbiol 2023; 89:e0042123. [PMID: 37074184 PMCID: PMC10231144 DOI: 10.1128/aem.00421-23] [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: 03/21/2023] [Accepted: 03/22/2023] [Indexed: 04/20/2023] Open
Abstract
The presence of virulent phages is closely monitored during cheese manufacturing, as these bacterial viruses can significantly slow down the milk fermentation process and lead to low-quality cheeses. From 2001 to 2020, whey samples from cheddar cheese production in a Canadian factory were monitored for the presence of virulent phages capable of infecting proprietary strains of Lactococcus cremoris and Lactococcus lactis used in starter cultures. Phages were successfully isolated from 932 whey samples using standard plaque assays and several industrial Lactococcus strains as hosts. A multiplex PCR assay assigned 97% of these phage isolates to the Skunavirus genus, 2% to the P335 group, and 1% to the Ceduovirus genus. DNA restriction profiles and a multilocus sequence typing (MLST) scheme distinguished at least 241 unique lactococcal phages from these isolates. While most phages were isolated only once, 93 of them (out of 241, 39%) were isolated multiple times. Phage GL7 was isolated 132 times from 2006 to 2020, demonstrating that phages can persist in a cheese factory for long periods of time. Phylogenetic analysis of MLST sequences showed that phages could be clustered based on their bacterial hosts rather than their year of isolation. Host range analysis showed that Skunavirus phages exhibited a very narrow host range, whereas some Ceduovirus and P335 phages had a broader host range. Overall, the host range information was useful in improving the starter culture rotation by identifying phage-unrelated strains and helped mitigating the risk of fermentation failure due to virulent phages. IMPORTANCE Although lactococcal phages have been observed in cheese production settings for almost a century, few longitudinal studies have been performed. This 20-year study describes the close monitoring of dairy lactococcal phages in a cheddar cheese factory. Routine monitoring was conducted by factory staff, and when whey samples were found to inhibit industrial starter cultures under laboratory conditions, they were sent to an academic research laboratory for phage isolation and characterization. This led to a collection of at least 241 unique lactococcal phages, which were characterized through PCR typing and MLST profiling. Phages of the Skunavirus genus were by far the most dominant. Most phages lysed a small subset of the Lactococcus strains. These findings guided the industrial partner in adapting the starter culture schedule by using phage-unrelated strains in starter cultures and removing some strains from the starter rotation. This phage control strategy could be adapted for other large-scale bacterial fermentation processes.
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Affiliation(s)
- Alice P. Jolicoeur
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Marie-Laurence Lemay
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
- Département de microbiologie, infectiologie et immunologie, Faculté de médecine, Université de Montréal, Montréal, Québec, Canada
| | - Elyse Beaubien
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Jessy Bélanger
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Claudia Bergeron
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Françoise Bourque-Leblanc
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Laurie Doré
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Marie-Ève Dupuis
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Audrey Fleury
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Josiane E. Garneau
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Simon J. Labrie
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Steve Labrie
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Geneviève Lacasse
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Marianne Lamontagne-Drolet
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Roxanne Lessard-Hurtubise
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Bruno Martel
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Rym Menasria
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Rachel Morin-Pelchat
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Gabrielle Pageau
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Julie E. Samson
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Geneviève M. Rousseau
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
| | - Denise M. Tremblay
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
- Félix d’Hérelle Reference Center for Bacterial Viruses, Université Laval, Québec City, Québec, Canada
| | | | | | - Sylvain Moineau
- Département de biochimie, de microbiologie et de bio-informatique, Faculté des sciences et de génie, Université Laval, Québec City, Québec, Canada
- Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, Québec, Canada
- Félix d’Hérelle Reference Center for Bacterial Viruses, Université Laval, Québec City, Québec, Canada
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RecT Affects Prophage Lifestyle and Host Core Cellular Processes in Pseudomonas aeruginosa. Appl Environ Microbiol 2022; 88:e0106822. [PMID: 36073944 PMCID: PMC9499030 DOI: 10.1128/aem.01068-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Pseudomonas aeruginosa is a notorious pathogen that causes various nosocomial infections. Several prophage genes located on the chromosomes of P. aeruginosa have been reported to contribute to bacterial pathogenesis via host phenotype transformations, such as serotype conversion and antibiotic resistance. However, our understanding of the molecular mechanism behind host phenotype shifts induced by prophage genes remains largely unknown. Here, we report a systematic study around a hypothetical recombinase, Pg54 (RecT), located on a 48-kb putative prophage (designated PP9W) of a clinical P. aeruginosa strain P9W. Using a ΔrecT mutant (designated P9D), we found that RecT promoted prophage PP9W excision and gene transcription via the inhibition of the gene expression level of pg40, which encodes a CI-like repressor protein. Further transcriptomic profiling and various phenotypic tests showed that RecT modulated like a suppressor to some transcription factors and vital genes of diverse cellular processes, providing multiple advantages for the host, including cell growth, biofilm formation, and virulence. The versatile functions of RecT hint at a strong impact of phage proteins on host P. aeruginosa phenotypic flexibility. IMPORTANCE Multidrug-resistant and metabolically versatile P. aeruginosa are difficult to eradicate by anti-infective therapy and frequently lead to significant morbidity and mortality. This study characterizes a putative recombinase (RecT) encoded by a prophage of a clinical P. aeruginosa strain isolated from severely burned patients, altering prophage lifestyle and host core cellular processes. It implies the potential role of RecT in the coevolution arm race between bacteria and phage. The excised free phages from the chromosome of host bacteria can be used as weapons against other sensitive competitors in diverse environments, which may increase the lysogeny frequency of different P. aeruginosa subgroups. Subsequent analyses revealed that RecT both positively and negatively affects different phenotypic traits of the host. These findings concerning RecT functions of host phenotypic flexibility improve our understanding of the association between phage recombinases and clinical P. aeruginosa, providing new insight into mitigating the pathogen infection.
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Inactivation of Dairy Bacteriophages by Thermal and Chemical Treatments. Viruses 2019; 11:v11050480. [PMID: 31130656 PMCID: PMC6563197 DOI: 10.3390/v11050480] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 05/22/2019] [Indexed: 11/16/2022] Open
Abstract
This article provides information on the characteristics of diverse phages of lactic acid bacteria and highlights the incidence of their presence in different dairy fermentations. As it is known, thermal treatments on raw milk and use of sanitizers in the disinfection of surfaces and equipment are strategies usually applied in dairy to prevent bacteriophage infections. In this sense, this review mainly focuses on the existing data about the resistance against thermal treatments and sanitizers usually used in the dairy industry worldwide, and the differences found among bacteriophages of diverse genera are remarked upon. Also, we provide information concerning the problems that have arisen as a consequence of the potential presence of bacteriophages in cheese whey powder and derivatives when they are added in fermented dairy product manufacturing. Finally, some important conclusions on each topic are marked and checkpoints to be considered are suggested.
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Molecular, physiological and phylogenetic traits of Lactococcus 936-type phages from distinct dairy environments. Sci Rep 2018; 8:12540. [PMID: 30135597 PMCID: PMC6105707 DOI: 10.1038/s41598-018-30371-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/20/2018] [Indexed: 11/13/2022] Open
Abstract
Bacteriophage infection of Lactococcus species can cause serious disruption of dairy fermentation processes. The most common isolates from the dairy environment are Siphoviridae lytic 936-type phages. To gain specific knowledge about this group of phages in Polish dairies, we examined 90 isolates from 8 different locations. Based on restriction fragment length polymorphism analysis, coupled with physiological and molecular studies, the isolated phages were divided into 8 distinct groups. Whole-genome sequencing of single representatives from each phage group provided data about their biology and genetic composition. The phages present an overall conserved genome organization. High sequence homology to another Polish isolate, Lactococcus phage bIBB29, indicates their close phylogenetic relatedness to this strain. Such similarity may be suggestive of a general genome conservation among phages persisting in Polish dairies. Comparative genome analyses with other 936-type phages revealed several discriminative traits, including the presence and position of HNH endonuclease genes, varying number of orfs in the early gene region, and a putative TpeX gene. Interestingly, host range of the sequenced phages was restricted to L. lactis subsp. lactis biovar. diacetylactis strains. The results provide new data regarding phages present in the Polish dairy environment and permit analysis of their biology, genome composition and relatedness to other Lactococcus 936-type phages.
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Abstract
Phages of Streptococcus thermophilus present a major threat to the production of many fermented dairy products. To date, only a few studies have assessed the biodiversity of S. thermophilus phages in dairy fermentations. In order to develop strategies to limit phage predation in this important industrial environment, it is imperative that such studies are undertaken and that phage-host interactions of this species are better defined. The present study investigated the biodiversity and evolution of phages within an Irish dairy fermentation facility over an 11-year period. This resulted in the isolation of 17 genetically distinct phages, all of which belong to the so-called cos group. The evolution of phages within the factory appears to be influenced by phages from other dairy plants introduced into the factory for whey protein powder production. Modular exchange, primarily within the regions encoding lysogeny and replication functions, was the major observation among the phages isolated between 2006 and 2016. Furthermore, the genotype of the first isolate in 2006 was observed continuously across the following decade, highlighting the ability of these phages to prevail in the factory setting for extended periods of time. The proteins responsible for host recognition were analyzed, and carbohydrate-binding domains (CBDs) were identified in the distal tail (Dit), the baseplate proteins, and the Tail-associated lysin (Tal) variable regions (VR1 and VR2) of many isolates. This supports the notion that S. thermophilus phages recognize a carbohydrate receptor on the cell surface of their host.IMPORTANCE Dairy fermentations are consistently threatened by the presence of bacterial viruses (bacteriophages or phages), which may lead to a reduction in acidification rates or even complete loss of the fermentate. These phages may persist in factories for long periods of time. The objective of the current study was to monitor the progression of phages infecting the dairy bacterium Streptococcus thermophilus over a period of 11 years in an Irish dairy plant so as to understand how these phages evolve. A focused analysis of the genomic region that encodes host recognition functions highlighted that the associated proteins harbor a variety of carbohydrate-binding domains, which corroborates the notion that phages of S. thermophilus recognize carbohydrate receptors at the initial stages of the phage cycle.
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Fu CQ, Zhao Q, Li ZY, Wang YX, Zhang SY, Lai YH, Xiao W, Cui XL. A novel Halomonas ventosae-specific virulent halovirus isolated from the Qiaohou salt mine in Yunnan, Southwest China. Extremophiles 2015; 20:101-10. [PMID: 26626363 DOI: 10.1007/s00792-015-0802-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2015] [Accepted: 11/15/2015] [Indexed: 11/28/2022]
Abstract
Although Halomonas phages belonging to the families Myoviridae and Siphoviridae have been reported, no virulent Halomonas siphoviruses are known. In this study, a virulent bacteriophage, QHHSV-1, of the family Siphoviridae that specifically infects H. ventosae QH52-2 was isolated from the Qiaohou salt mine. Restriction analysis indicated that QHHSV-1 is a dsDNA virus with a genome size of 33.5-39.5 kb. Transmission electron microscopy showed that QHHSV-1 is a typical representative of the Siphoviridae, with an icosahedral head (47 nm in diameter) and a non-contractile tail (75 nm in length). We also assessed the adsorption rate of QHHSV-1 for the host bacterium and found significant inhibition after the addition of 10 mM CaCl2. Based on a one-step growth curve, we determined a latent period of 30 min and a burst size of 73 PFU/infected cell. At the optimal pH of 8.0, 25.9 and 15.2 % of the phages survived after a 60-min incubation at 50 and 60 °C, respectively. Phage replication was possible at a wide range of salt concentrations, from 2.0 to 20 % (w/v), with an optimum concentration of 5 %. The survival of QHHSV-1 at different salt concentrations decreased with time and 25 % survival after 25 days at 30 % salt concentration.
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Affiliation(s)
- Chao-Qun Fu
- Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan, 650091, People's Republic of China
| | - Qin Zhao
- Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan, 650091, People's Republic of China
| | - Zhi-Ying Li
- Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan, 650091, People's Republic of China
| | - Yong-Xia Wang
- Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan, 650091, People's Republic of China
| | - Shi-Ying Zhang
- Yunnan Engineering Laboratory of Soil Fertility and Pollution Remediation, Yunnan Agricultural University, Kunming, Yunnan, 650201, People's Republic of China
| | - Yong-Hong Lai
- Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan, 650091, People's Republic of China
| | - Wei Xiao
- Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan, 650091, People's Republic of China.
| | - Xiao-Long Cui
- Key Laboratory of Microbial Diversity in Southwest China, Ministry of Education, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan, 650091, People's Republic of China.
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Mercanti DJ, Ackermann HW, Quiberoni A. Characterization of Two Temperate Lactobacillus paracasei Bacteriophages: Morphology, Kinetics and Adsorption. Intervirology 2015; 58:49-56. [DOI: 10.1159/000369207] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 10/18/2014] [Indexed: 11/19/2022] Open
Abstract
Background/Aims: Adsorption and kinetic parameters, latent period, burst size and burst time, are characteristics of phage/host systems and can be affected by several environmental factors. As only few studies have focused on temperate dairy phages, we characterized these parameters on temperate Lactobacillus paracasei phages Φ iLp84 and Φ iLp1308, infective for probiotic strains. Methods: Phages were characterized by transmission electron microscopy and genomic DNA restriction. Adsorption under different environmental conditions, phage kinetics and efficiency of plating (EOP) were determined using the double-layer titration method. Results: Phages Φ iLp84 and Φ iLp1308 belong to the Siphoviridae family and have genome sizes of 38 and 34 kbp, respectively. Adsorption was affected by calcium concentration, pH, temperature and host viability, and reached a limit at very high multiplicity of infection. Latency, burst time and burst size were of 85 min, 131 min and 46 for Φ iLp84, and 51 min, 92 min and 28 for Φ iLp1308, respectively, at 37°C. A clear influence of temperature on phage kinetics was observed. Regarding EOP, Φ iLp84 produced plaques on only 1 out of 8 strains tested. Conclusion: Noticeable differences in adsorption, kinetics and EOP were found for two morphologically identical temperate L. paracasei phages of similar origin.
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Mahony J, Murphy J, van Sinderen D. Lactococcal 936-type phages and dairy fermentation problems: from detection to evolution and prevention. Front Microbiol 2012; 3:335. [PMID: 23024644 PMCID: PMC3445015 DOI: 10.3389/fmicb.2012.00335] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 08/29/2012] [Indexed: 11/21/2022] Open
Abstract
The so-called 936-type phages are the most frequently encountered lactococcal phage species in dairy fermentations, where they cause slow or even failed fermentations with concomitant economic losses. Several dairy phage population studies, performed in different geographical locations, have detailed their dominance in dairy phage populations, while various phage-resistance mechanisms have been assessed in a bid to protect against this virulent phage group. The impact of thermal and chemical treatments on 936 phages is an important aspect for dairy technologists and has been assessed in several studies, and has indicated that these phages have adapted to better resist such treatments. The abundance of 936 phage genome sequences has permitted a focused view on genomic content and regions of variation, and the role of such variable regions in the evolution of these phages. Here, we present an overview on detection and global prevalence of the 936 phages, together with their tolerance to industrial treatments and anti-phage strategies. Furthermore, we present a comprehensive review on the comparative genomic analyses of members of this fascinating phage species.
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Affiliation(s)
- Jennifer Mahony
- Department of Microbiology, University College Cork Cork, Ireland
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Castro-Nallar E, Chen H, Gladman S, Moore SC, Seemann T, Powell IB, Hillier A, Crandall KA, Chandry PS. Population genomics and phylogeography of an Australian dairy factory derived lytic bacteriophage. Genome Biol Evol 2012; 4:382-93. [PMID: 22355195 PMCID: PMC3318435 DOI: 10.1093/gbe/evs017] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
In this study, we present the full genomic sequences and evolutionary analyses of a serially sampled population of 28 Lactococcus lactis-infecting phage belonging to the 936-like group in Australia. Genome sizes were consistent with previously available genomes ranging in length from 30.9 to 32.1 Kbp and consisted of 55-65 open reading frames. We analyzed their genetic diversity and found that regions of high diversity are correlated with high recombination rate regions (P value = 0.01). Phylogenetic inference showed two major clades that correlate well with known host range. Using the extended Bayesian Skyline model, we found that population size has remained mostly constant through time. Moreover, the dispersion pattern of these genomes is in agreement with human-driven dispersion as suggested by phylogeographic analysis. In addition, selection analysis found evidence of positive selection on codon positions of the Receptor Binding Protein (RBP). Likewise, positively selected sites in the RBP were located within the neck and head region in the crystal structure, both known determinants of host range. Our study demonstrates the utility of phylogenetic methods applied to whole genome data collected from populations of phage for providing insights into applied microbiology.
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Verreault D, Gendron L, Rousseau GM, Veillette M, Massé D, Lindsley WG, Moineau S, Duchaine C. Detection of airborne lactococcal bacteriophages in cheese manufacturing plants. Appl Environ Microbiol 2011; 77:491-7. [PMID: 21115712 PMCID: PMC3020544 DOI: 10.1128/aem.01391-10] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Accepted: 11/15/2010] [Indexed: 11/20/2022] Open
Abstract
The dairy industry adds starter bacterial cultures to heat-treated milk to control the fermentation process during the manufacture of many cheeses. These highly concentrated bacterial populations are susceptible to virulent phages that are ubiquitous in cheese factories. In this study, the dissemination of these phages by the airborne route and their presence on working surfaces were investigated in a cheese factory. Several surfaces were swabbed, and five air samplers (polytetrafluoroethylene filter, polycarbonate filter, BioSampler, Coriolis cyclone sampler, and NIOSH two-stage cyclone bioaerosol personal sampler) were tested. Samples were then analyzed for the presence of two Lactococcus lactis phage groups (936 and c2), and quantification was done by quantitative PCR (qPCR). Both lactococcal phage groups were found on most swabbed surfaces, while airborne phages were detected at concentrations of at least 10(3) genomes/m(3) of air. The NIOSH sampler had the highest rate of air samples with detectable levels of lactococcal phages. This study demonstrates that virulent phages can circulate through the air and that they are ubiquitous in cheese manufacturing facilities.
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Affiliation(s)
- Daniel Verreault
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 Chemin Ste-Foy, Québec City, Québec G1V 4G5, Canada, Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, Québec G1V 0A6, Canada, Groupe de Recherche en Écologie Buccale (GREB) and Félix d'Hérelle Reference Center for Bacterial Viruses, Faculté de Médecine Dentaire, Université Laval, Québec City, Québec G1V 0A6, Canada, Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, Québec J1M 0C8, Canada, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia 26505
| | - Louis Gendron
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 Chemin Ste-Foy, Québec City, Québec G1V 4G5, Canada, Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, Québec G1V 0A6, Canada, Groupe de Recherche en Écologie Buccale (GREB) and Félix d'Hérelle Reference Center for Bacterial Viruses, Faculté de Médecine Dentaire, Université Laval, Québec City, Québec G1V 0A6, Canada, Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, Québec J1M 0C8, Canada, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia 26505
| | - Geneviève M. Rousseau
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 Chemin Ste-Foy, Québec City, Québec G1V 4G5, Canada, Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, Québec G1V 0A6, Canada, Groupe de Recherche en Écologie Buccale (GREB) and Félix d'Hérelle Reference Center for Bacterial Viruses, Faculté de Médecine Dentaire, Université Laval, Québec City, Québec G1V 0A6, Canada, Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, Québec J1M 0C8, Canada, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia 26505
| | - Marc Veillette
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 Chemin Ste-Foy, Québec City, Québec G1V 4G5, Canada, Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, Québec G1V 0A6, Canada, Groupe de Recherche en Écologie Buccale (GREB) and Félix d'Hérelle Reference Center for Bacterial Viruses, Faculté de Médecine Dentaire, Université Laval, Québec City, Québec G1V 0A6, Canada, Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, Québec J1M 0C8, Canada, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia 26505
| | - Daniel Massé
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 Chemin Ste-Foy, Québec City, Québec G1V 4G5, Canada, Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, Québec G1V 0A6, Canada, Groupe de Recherche en Écologie Buccale (GREB) and Félix d'Hérelle Reference Center for Bacterial Viruses, Faculté de Médecine Dentaire, Université Laval, Québec City, Québec G1V 0A6, Canada, Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, Québec J1M 0C8, Canada, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia 26505
| | - William G. Lindsley
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 Chemin Ste-Foy, Québec City, Québec G1V 4G5, Canada, Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, Québec G1V 0A6, Canada, Groupe de Recherche en Écologie Buccale (GREB) and Félix d'Hérelle Reference Center for Bacterial Viruses, Faculté de Médecine Dentaire, Université Laval, Québec City, Québec G1V 0A6, Canada, Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, Québec J1M 0C8, Canada, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia 26505
| | - Sylvain Moineau
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 Chemin Ste-Foy, Québec City, Québec G1V 4G5, Canada, Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, Québec G1V 0A6, Canada, Groupe de Recherche en Écologie Buccale (GREB) and Félix d'Hérelle Reference Center for Bacterial Viruses, Faculté de Médecine Dentaire, Université Laval, Québec City, Québec G1V 0A6, Canada, Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, Québec J1M 0C8, Canada, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia 26505
| | - Caroline Duchaine
- Centre de Recherche, Institut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 Chemin Ste-Foy, Québec City, Québec G1V 4G5, Canada, Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, Québec G1V 0A6, Canada, Groupe de Recherche en Écologie Buccale (GREB) and Félix d'Hérelle Reference Center for Bacterial Viruses, Faculté de Médecine Dentaire, Université Laval, Québec City, Québec G1V 0A6, Canada, Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, Québec J1M 0C8, Canada, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, West Virginia 26505
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Yang H, Liang L, Lin S, Jia S. Isolation and characterization of a virulent bacteriophage AB1 of Acinetobacter baumannii. BMC Microbiol 2010; 10:131. [PMID: 20426877 PMCID: PMC2874798 DOI: 10.1186/1471-2180-10-131] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Accepted: 04/29/2010] [Indexed: 01/21/2023] Open
Abstract
Background Acinetobacter baumannii is an emerging nosocomial pathogen worldwide with increasing prevalence of multi-drug and pan-drug resistance. A. baumannii exists widely in natural environment, especially in health care settings, and has been shown difficult to be eradicated. Bacteriophages are often considered alternative agent for controlling bacterial infection and contamination. In this study, we described the isolation and characterization of one virulent bacteriophage AB1 capable of specifically infecting A. baumannii. Results A virulent bacteriophage AB1, specific for infecting a clinical strain A. baumannii KD311, was first isolated from marine sediment sample. Restriction analysis indicated that phage AB1 was a dsDNA virus with an approximate genome size of 45.2 kb to 46.9 kb. Transmission electron microscopy showed that phage AB1 had an icosahedral head with a non-contractile tail and collar or whisker structures, and might be tentatively classified as a member of the Siphoviridae family. Proteomic pattern of phage AB1, generated by SDS-PAGE using purified phage particles, revealed five major bands and six minor bands with molecular weight ranging from 14 to 80 kilo-dalton. Also determined was the adsorption rate of phage AB1 to the host bacterium, which was significantly enhanced by addition of 10 mM CaCl2. In a single step growth test, phage AB1 was shown having a latent period of 18 minutes and a burst size of 409. Moreover, pH and thermal stability of phage AB1 were also investigated. At the optimal pH 6.0, 73.2% of phages survived after 60 min incubation at 50°C. When phage AB1 was used to infect four additional clinical isolates of A. baumannii, one clinical isolate of Stenotrophomonas maltophilia, and Pseudomonas aeruginosa lab strains PAK and PAO1, none of the tested strains was found susceptible, indicating a relatively narrow host range for phage AB1. Conclusion Phage AB1 was capable of eliciting efficient lysis of A. baumannii, revealing its potential as a non-toxic sanitizer for controlling A. baumannii infection and contamination in both hospital and other public environments.
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Affiliation(s)
- Hongjiang Yang
- Key Laboratory of Industrial Microbiology, Ministry of Education, PO Box 08, Tianjin University of Science & Technology, TEDA, Tianjin 300457, PR China.
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