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https://www.readbyqxmd.com/read/28327527/emerging-interaction-patterns-in-the-emiliania-huxleyi-ehv-system
#1
Eliana Ruiz, Monique Oosterhof, Ruth-Anne Sandaa, Aud Larsen, António Pagarete
Viruses are thought to be fundamental in driving microbial diversity in the oceanic planktonic realm. That role and associated emerging infection patterns remain particularly elusive for eukaryotic phytoplankton and their viruses. Here we used a vast number of strains from the model system Emiliania huxleyi/Emiliania huxleyi Virus to quantify parameters such as growth rate (µ), resistance (R), and viral production (Vp) capacities. Algal and viral abundances were monitored by flow cytometry during 72-h incubation experiments...
March 22, 2017: Viruses
https://www.readbyqxmd.com/read/28327522/isolation-and-characterization-of-a-shewanella-phage-host-system-from-the-gut-of-the-tunicate-ciona-intestinalis
#2
Brittany Leigh, Charlotte Karrer, John P Cannon, Mya Breitbart, Larry J Dishaw
Outnumbering all other biological entities on earth, bacteriophages (phages) play critical roles in structuring microbial communities through bacterial infection and subsequent lysis, as well as through horizontal gene transfer. While numerous studies have examined the effects of phages on free-living bacterial cells, much less is known regarding the role of phage infection in host-associated biofilms, which help to stabilize adherent microbial communities. Here we report the cultivation and characterization of a novel strain of Shewanella fidelis from the gut of the marine tunicate Ciona intestinalis, inducible prophages from the S...
March 22, 2017: Viruses
https://www.readbyqxmd.com/read/28327518/myeloid-c-type-lectin-receptors-in-viral-recognition-and-antiviral-immunity
#3
REVIEW
João T Monteiro, Bernd Lepenies
Recognition of viral glycans by pattern recognition receptors (PRRs) in innate immunity contributes to antiviral immune responses. C-type lectin receptors (CLRs) are PRRs capable of sensing glycans present in viral pathogens to activate antiviral immune responses such as phagocytosis, antigen processing and presentation, and subsequent T cell activation. The ability of CLRs to elicit and shape adaptive immunity plays a critical role in the inhibition of viral spread within the host. However, certain viruses exploit CLRs for viral entry into host cells to avoid immune recognition...
March 22, 2017: Viruses
https://www.readbyqxmd.com/read/28335567/cross-regulation-between-transposable-elements-and-host-dna-replication
#4
REVIEW
Mikel Zaratiegui
Transposable elements subvert host cellular functions to ensure their survival. Their interaction with the host DNA replication machinery indicates that selective pressures lead them to develop ancestral and convergent evolutionary adaptations aimed at conserved features of this fundamental process. These interactions can shape the co-evolution of the transposons and their hosts.
March 21, 2017: Viruses
https://www.readbyqxmd.com/read/28335562/virus-bacteria-interactions-an-emerging-topic-in-human-infection
#5
REVIEW
Erin A Almand, Matthew D Moore, Lee-Ann Jaykus
Bacteria and viruses often occupy the same niches, however, interest in their potential collaboration in promoting wellness or disease states has only recently gained traction. While the interaction of some bacteria and viruses is well characterized (e.g., influenza virus), researchers are typically more interested in the location of the infection than the manner of cooperation. There are two overarching types of bacterial-virus disease causing interactions: direct interactions that in some way aid the viruses, and indirect interactions aiding bacteria...
March 21, 2017: Viruses
https://www.readbyqxmd.com/read/28335554/complete-and-incomplete-hepatitis-b-virus-particles-formation-function-and-application
#6
REVIEW
Jianming Hu, Kuancheng Liu
Hepatitis B virus (HBV) is a para-retrovirus or retroid virus that contains a double-stranded DNA genome and replicates this DNA via reverse transcription of a RNA pregenome. Viral reverse transcription takes place within a capsid upon packaging of the RNA and the viral reverse transcriptase. A major characteristic of HBV replication is the selection of capsids containing the double-stranded DNA, but not those containing the RNA or the single-stranded DNA replication intermediate, for envelopment during virion secretion...
March 21, 2017: Viruses
https://www.readbyqxmd.com/read/28335552/virological-surveillance-of-influenza-a-subtypes-isolated-in-2014-from-clinical-outbreaks-in-canadian-swine
#7
Helena Grgić, Jackie Gallant, Zvonimir Poljak
Influenza A viruses (IAVs) are respiratory pathogens associated with an acute respiratory disease that occurs year-round in swine production. It is currently one of the most important pathogens in swine populations, with the potential to infect other host species including humans. Ongoing research indicates that the three major subtypes of IAV-H1N1, H1N2, and H3N2-continue to expand in their genetic and antigenic diversity. In this study, we conducted a comprehensive genomic analysis of 16 IAVs isolated from different clinical outbreaks in Alberta, Manitoba, Ontario, and Saskatchewan in 2014...
March 21, 2017: Viruses
https://www.readbyqxmd.com/read/28335511/1st-workshop-of-the-canadian-society-for-virology
#8
Craig McCormick, Nathalie Grandvaux
The 1st Workshop of the Canadian Society for Virology (CSV2016) was a Special Workshop of the 35th Annual Meeting for the American Society for Virology, held on 18 June 2016 on the beautiful Virginia Tech campus in Blacksburg, Virginia. The workshop provided a forum for discussion of recent advances in the field, in an informal setting conducive to interaction with colleagues. CSV2016 featured two internationally-renowned Canadian keynote speakers who discussed translational virology research; American Society for Virology President Grant McFadden (then from University of Florida, now relocated to Arizona State University) who presented his studies of oncolytic poxviruses, while Matthew Miller (McMaster University) reviewed the prospects for a universal influenza vaccine...
March 20, 2017: Viruses
https://www.readbyqxmd.com/read/28335505/porcine-epidemic-diarrhea-virus-induces-autophagy-to-benefit-its-replication
#9
Xiaozhen Guo, Mengjia Zhang, Xiaoqian Zhang, Xin Tan, Hengke Guo, Wei Zeng, Guokai Yan, Atta Muhammad Memon, Zhonghua Li, Yinxing Zhu, Bingzhou Zhang, Xugang Ku, Meizhou Wu, Shengxian Fan, Qigai He
The new porcine epidemic diarrhea (PED) has caused devastating economic losses to the swine industry worldwide. Despite extensive research on the relationship between autophagy and virus infection, the concrete role of autophagy in porcine epidemic diarrhea virus (PEDV) infection has not been reported. In this study, autophagy was demonstrated to be triggered by the effective replication of PEDV through transmission electron microscopy, confocal microscopy, and Western blot analysis. Moreover, autophagy was confirmed to benefit PEDV replication by using autophagy regulators and RNA interference...
March 19, 2017: Viruses
https://www.readbyqxmd.com/read/28335474/coccolithoviruses-a-review-of-cross-kingdom-genomic-thievery-and-metabolic-thuggery
#10
Jozef I Nissimov, António Pagarete, Fangrui Ma, Sean Cody, David D Dunigan, Susan A Kimmance, Michael J Allen
Coccolithoviruses (Phycodnaviridae) infect and lyse the most ubiquitous and successful coccolithophorid in modern oceans, Emiliania huxleyi. So far, the genomes of 13 of these giant lytic viruses (i.e., Emiliania huxleyi viruses-EhVs) have been sequenced, assembled, and annotated. Here, we performed an in-depth comparison of their genomes to try and contextualize the ecological and evolutionary traits of these viruses. The genomes of these EhVs have from 444 to 548 coding sequences (CDSs). Presence/absence analysis of CDSs identified putative genes with particular ecological significance, namely sialidase, phosphate permease, and sphingolipid biosynthesis...
March 18, 2017: Viruses
https://www.readbyqxmd.com/read/28335465/schr%C3%A3-dinger-s-cheshire-cat-are-haploid-emiliania-huxleyi-cells-resistant-to-viral-infection-or-not
#11
Gideon J Mordecai, Frederic Verret, Andrea Highfield, Declan C Schroeder
Emiliania huxleyi is the main calcite producer on Earth and is routinely infected by a virus (EhV); a double stranded DNA (dsDNA) virus belonging to the family Phycodnaviridae. E. huxleyi exhibits a haplodiploid life cycle; the calcified diploid stage is non-motile and forms extensive blooms. The haploid phase is a non-calcified biflagellated cell bearing organic scales. Haploid cells are thought to resist infection, through a process deemed the "Cheshire Cat" escape strategy; however, a recent study detected the presence of viral lipids in the same haploid strain...
March 18, 2017: Viruses
https://www.readbyqxmd.com/read/28335455/viral-protein-kinetics-of-piscine-orthoreovirus-infection-in-atlantic-salmon-blood-cells
#12
Hanne Merethe Haatveit, Øystein Wessel, Turhan Markussen, Morten Lund, Bernd Thiede, Ingvild Berg Nyman, Stine Braaen, Maria Krudtaa Dahle, Espen Rimstad
Piscine orthoreovirus (PRV) is ubiquitous in farmed Atlantic salmon (Salmo salar) and the cause of heart and skeletal muscle inflammation. Erythrocytes are important target cells for PRV. We have investigated the kinetics of PRV infection in salmon blood cells. The findings indicate that PRV causes an acute infection of blood cells lasting 1-2 weeks, before it subsides into persistence. A high production of viral proteins occurred initially in the acute phase which significantly correlated with antiviral gene transcription...
March 18, 2017: Viruses
https://www.readbyqxmd.com/read/28335454/porcine-rotaviruses-epidemiology-immune-responses-and-control-strategies
#13
REVIEW
Anastasia N Vlasova, Joshua O Amimo, Linda J Saif
Rotaviruses (RVs) are a major cause of acute viral gastroenteritis in young animals and children worldwide. Immunocompetent adults of different species become resistant to clinical disease due to post-infection immunity, immune system maturation and gut physiological changes. Of the 9 RV genogroups (A-I), RV A, B, and C (RVA, RVB, and RVC, respectively) are associated with diarrhea in piglets. Although discovered decades ago, porcine genogroup E RVs (RVE) are uncommon and their pathogenesis is not studied well...
March 18, 2017: Viruses
https://www.readbyqxmd.com/read/28335451/a-review-of-phage-therapy-against-bacterial-pathogens-of-aquatic-and-terrestrial-organisms
#14
REVIEW
Janis Doss, Kayla Culbertson, Delilah Hahn, Joanna Camacho, Nazir Barekzi
Since the discovery of bacteriophage in the early 1900s, there have been numerous attempts to exploit their innate ability to kill bacteria. The purpose of this report is to review current findings and new developments in phage therapy with an emphasis on bacterial diseases of marine organisms, humans, and plants. The body of evidence includes data from studies investigating bacteriophage in marine and land environments as modern antimicrobial agents against harmful bacteria. The goal of this paper is to present an overview of the topic of phage therapy, the use of phage-derived protein therapy, and the hosts that bacteriophage are currently being used against, with an emphasis on the uses of bacteriophage against marine, human, animal and plant pathogens...
March 18, 2017: Viruses
https://www.readbyqxmd.com/read/28304358/a-pelagic-microbiome-viruses-to-protists-from-a-small-cup-of-seawater
#15
Flavia Flaviani, Declan C Schroeder, Cecilia Balestreri, Joanna L Schroeder, Karen Moore, Konrad Paszkiewicz, Maya C Pfaff, Edward P Rybicki
The aquatic microbiome is composed of a multi-phylotype community of microbes, ranging from the numerically dominant viruses to the phylogenetically diverse unicellular phytoplankton. They influence key biogeochemical processes and form the base of marine food webs, becoming food for secondary consumers. Due to recent advances in next-generation sequencing, this previously overlooked component of our hydrosphere is starting to reveal its true diversity and biological complexity. We report here that 250 mL of seawater is sufficient to provide a comprehensive description of the microbial diversity in an oceanic environment...
March 17, 2017: Viruses
https://www.readbyqxmd.com/read/28304329/a-student-s-guide-to-giant-viruses-infecting-small-eukaryotes-from-acanthamoeba-to-zooxanthellae
#16
REVIEW
Steven W Wilhelm, Jordan T Bird, Kyle S Bonifer, Benjamin C Calfee, Tian Chen, Samantha R Coy, P Jackson Gainer, Eric R Gann, Huston T Heatherly, Jasper Lee, Xiaolong Liang, Jiang Liu, April C Armes, Mohammad Moniruzzaman, J Hunter Rice, Joshua M A Stough, Robert N Tams, Evan P Williams, Gary R LeCleir
The discovery of infectious particles that challenge conventional thoughts concerning "what is a virus" has led to the evolution a new field of study in the past decade. Here, we review knowledge and information concerning "giant viruses", with a focus not only on some of the best studied systems, but also provide an effort to illuminate systems yet to be better resolved. We conclude by demonstrating that there is an abundance of new host-virus systems that fall into this "giant" category, demonstrating that this field of inquiry presents great opportunities for future research...
March 17, 2017: Viruses
https://www.readbyqxmd.com/read/28300778/phage-biodiversity-in-artisanal-cheese-wheys-reflects-the-complexity-of-the-fermentation-process
#17
Jennifer Mahony, Angelo Moscarelli, Philip Kelleher, Gabriele A Lugli, Marco Ventura, Luca Settanni, Douwe van Sinderen
Dairy fermentations constitute a perfect "breeding ground" for bacteriophages infecting starter cultures, particularly strains of Lactococcus lactis. In modern fermentations, these phages typically belong to one of three groups, i.e., the 936, P335, and c2 phage groups. Traditional production methods present fewer chemical and physical barriers to phage proliferation compared to modern production systems, while the starter cultures used are typically complex, variable, and undefined. In the current study, a variety of cheese whey, animal-derived rennet, and vat swab samples from artisanal cheeses produced in Sicily were analysed for the presence of lactococcal phages to assess phage diversity in such environments...
March 16, 2017: Viruses
https://www.readbyqxmd.com/read/28294997/marine-prasinoviruses-and-their-tiny-plankton-hosts-a-review
#18
REVIEW
Karen D Weynberg, Michael J Allen, William H Wilson
Viruses play a crucial role in the marine environment, promoting nutrient recycling and biogeochemical cycling and driving evolutionary processes. Tiny marine phytoplankton called prasinophytes are ubiquitous and significant contributors to global primary production and biomass. A number of viruses (known as prasinoviruses) that infect these important primary producers have been isolated and characterised over the past decade. Here we review the current body of knowledge about prasinoviruses and their interactions with their algal hosts...
March 15, 2017: Viruses
https://www.readbyqxmd.com/read/28294975/reverse-transcription-in-the-saccharomyces-cerevisiae-long-terminal-repeat-retrotransposon-ty3
#19
REVIEW
Jason W Rausch, Jennifer T Miller, Stuart F J Le Grice
Converting the single-stranded retroviral RNA into integration-competent double-stranded DNA is achieved through a multi-step process mediated by the virus-coded reverse transcriptase (RT). With the exception that it is restricted to an intracellular life cycle, replication of the Saccharomyces cerevisiae long terminal repeat (LTR)-retrotransposon Ty3 genome is guided by equivalent events that, while generally similar, show many unique and subtle differences relative to the retroviral counterparts. Until only recently, our knowledge of RT structure and function was guided by a vast body of literature on the human immunodeficiency virus (HIV) enzyme...
March 15, 2017: Viruses
https://www.readbyqxmd.com/read/28335410/non-canonical-roles-of-dengue-virus-non-structural-proteins
#20
REVIEW
Julianna D Zeidler, Lorena O Fernandes-Siqueira, Glauce M Barbosa, Andrea T Da Poian
The Flaviviridae family comprises a number of human pathogens, which, although sharing structural and functional features, cause diseases with very different outcomes. This can be explained by the plurality of functions exerted by the few proteins coded by viral genomes, with some of these functions shared among members of a same family, but others being unique for each virus species. These non-canonical functions probably have evolved independently and may serve as the base to the development of specific therapies for each of those diseases...
March 13, 2017: Viruses
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