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Virology

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https://www.readbyqxmd.com/read/28081430/amphibian-xenopus-laevis-tadpoles-and-adult-frogs-mount-distinct-interferon-responses-to-the-frog-virus-3-ranavirus
#1
Emily S Wendel, Amulya Yaparla, Daphne V Koubourli, Leon Grayfer
Infections of amphibians by Frog Virus 3 (FV3) and other ranavirus genus members are significantly contributing to the amphibian declines, yet much remains unknown regarding amphibian antiviral immunity. Notably, amphibians represent an important step in the evolution of antiviral interferon (IFN) cytokines as they are amongst the first vertebrates to possess both type I and type III IFNs. Accordingly, we examined the roles of type I and III IFNs in the skin of FV3-challenged amphibian Xenopus laevis) tadpoles and adult frogs...
January 9, 2017: Virology
https://www.readbyqxmd.com/read/28073069/horizontal-pollen-transmission-of-gentian-ovary-ring-spot-virus-is-initiated-during-penetration-of-the-stigma-and-style-by-infected-pollen-tubes
#2
Masamichi Isogai, Yukie Kamata, Syunpei Ando, Misaki Kamata, Asuka Shirakawa, Ken-Taro Sekine, Nobuyuki Yoshikawa
Gentian ovary ring-spot virus (GORV) infected gentian plants by pollination with GORV-infected gentian pollen grains, but the virus was not horizontally transmitted to gentian plants by transfer of pollen from GORV-infected Nicotiana benthamiana plants. However, N. benthamiana plants were infected with the virus by pollination with infected gentian pollen as well as by pollination with infected N. benthamiana pollen. When infected gentian pollen grains were placed on N. benthamiana stigmas, germinating pollen tubes penetrated into the stigmas and the styles (stigma-style)...
January 7, 2017: Virology
https://www.readbyqxmd.com/read/28068513/nrf2-dependent-induction-of-innate-host-defense-via-heme-oxygenase-1-inhibits-zika-virus-replication
#3
Hanxia Huang, Barry Falgout, Kazuyo Takeda, Kenneth M Yamada, Subhash Dhawan
We identified primary human monocyte-derived macrophages (MDM) as vulnerable target cells for Zika virus (ZIKV) infection. We demonstrate dramatic effects of hemin, the natural inducer of the heme catabolic enzyme heme oxygenase-1 (HO-1), in the reduction of ZIKV replication in vitro. Both LLC-MK2 monkey kidney cells and primary MDM exhibited hemin-induced HO-1 expression with major reductions of >90% in ZIKV replication, with little toxicity to infected cells. Silencing expression of HO-1 or its upstream regulatory gene, nuclear factor erythroid-related factor 2 (Nrf2), attenuated hemin-induced suppression of ZIKV infection, suggesting an important role for induction of these intracellular mediators in retarding ZIKV replication...
January 6, 2017: Virology
https://www.readbyqxmd.com/read/28063344/reducing-persistent-polyomavirus-infection-increases-functionality-of-virus-specific-memory-cd8-t-cells
#4
Qingsong Qin, Matthew Lauver, Saumya Maru, Eugene Lin, Aron E Lukacher
Mouse polyomavirus (MuPyV) causes a smoldering persistent infection in immunocompetent mice. To lower MuPyV infection in acutely and persistently infected mice, and study the impact of a temporal reduction in viral loads on the memory CD8 T cell response, we created a recombinant MuPyV in which a loxP sequence was inserted into the A2 strain genome upstream of the early promoter and another loxP sequence was inserted in cis into the intron shared by all three T antigens. Using mice transgenic for tamoxifen-inducible Cre recombinase, we demonstrated that reduction in MuPyV load during persistent infection was associated with differentiation of virus-specific CD8 T cells having a superior recall response...
January 4, 2017: Virology
https://www.readbyqxmd.com/read/28063343/a-novel-pathogenic-aviadenovirus-from-red-bellied-parrots-poicephalus-rufiventris-unveils-deep-recombination-events-among-avian-host-lineages
#5
Shubhagata Das, Kathleen Fearnside, Subir Sarker, Jade K Forwood, Shane R Raidal
Competing roles of coevolution, selective pressure and recombination are an emerging interest in virus evolution. We report a novel aviadenovirus from captive red-bellied parrots (Poicephalus rufiventris) that uncovers evidence of deep recombination among aviadenoviruses. The sequence identity of the virus was most closely related to Turkey adenovirus D (42% similarity) and other adenoviruses in chickens, turkeys and pigeons. Sequencing and comparative analysis showed that the genome comprised 40,930 nucleotides containing 42 predicted open reading frames (ORFs) 19 of which had strong similarity with genes from other adenovirus species...
January 4, 2017: Virology
https://www.readbyqxmd.com/read/28061386/characterization-of-the-disassembly-and-reassembly-of-the-hbv-glycoprotein-surface-antigen-a-pliable-nanoparticle-vaccine-platform
#6
John R Gallagher, Udana Torian, Dustin M McCraw, Audray K Harris
While nanoparticle vaccine technology is gaining interest due to the success of vaccines like those for the human papillomavirus that is based on viral capsid nanoparticles, little information is available on the disassembly and reassembly of viral surface glycoprotein-based nanoparticles. One such particle is the hepatitis B virus surface antigen (sAg) that exists as nanoparticles. Here we show, using biochemical analysis coupled with electron microscopy, that sAg nanoparticle disassembly requires both reducing agent to disrupt intermolecular disulfide bonds, and detergent to disrupt hydrophobic interactions that stabilize the nanoparticle...
January 3, 2017: Virology
https://www.readbyqxmd.com/read/28056416/studies-on-the-transmission-and-tissue-distribution-of-antheraea-pernyi-iflavirus-in-the-chinese-oak-silkmoth-antheraea-pernyi
#7
Peng Geng, Wenli Li, Joachim R de Miranda, Zhou Qian, Lijia An, Olle Terenius
Antheraea pernyi Iflavirus (ApIV) is a virus that is the likely causative agent of A. pernyi Vomit Disease (AVD). The virus is maintained in A. pernyi populations as an unapparent infection by as yet unknown transmission routes. The mechanisms by which an infection results in AVD are also not yet known. Both these factors were investigated in this study. A. pernyi larvae were fed or injected with ApIV, but only injection led to active replication and spread of ApIV to the head, epidermis, hemocytes, gut, fatbody, ovary and testis...
January 2, 2017: Virology
https://www.readbyqxmd.com/read/28056415/divergent-tropism-of-hhv-6ags-and-hhv-6bpl1-in-t-cells-expressing-different-cd46-isoform-patterns
#8
Aida S Hansen, Bettina B Bundgaard, Mette Biltoft, Litten S Rossen, Per Höllsberg
CD46 is a receptor for HHV-6A, but its role as a receptor for HHV-6B is controversial. The significance of CD46 isoforms for HHV-6A and HHV-6B tropism is unknown. HHV-6AGS was able to initiate transcription of the viral genes U7 and U23 in the CD46(+)CD134(-) T-cell lines Peer, Jurkat, Molt3, and SupT1, whereas HHV-6BPL1 was only able to do so in Molt3 and SupT1, which expressed a CD46 isoform pattern different from Peer and Jurkat. The HHV-6BPL1-susceptible T-cell lines were characterized by low expression of the CD46 isoform BC2 and domination of isoforms containing the cytoplasmic tail, CYT-1...
January 2, 2017: Virology
https://www.readbyqxmd.com/read/28056414/clathrin-mediated-endocytosis-is-involved-in-tomato-yellow-leaf-curl-virus-transport-across-the-midgut-barrier-of-its-whitefly-vector
#9
Li-Long Pan, Qun-Fang Chen, Juan-Juan Zhao, Tao Guo, Xiao-Wei Wang, Aliza Hariton-Shalev, Henryk Czosnek, Shu-Sheng Liu
Tomato yellow leaf curl virus (TYLCV) is a begomovirus transmitted by the whitefly Bemisia tabaci. The circulative translocation of the virus in the insect is known in its broad line. However, transit of TYLCV from the digestive tract into the haemolymph is poorly understood. We studied the involvement of clathrin in this process by disrupting the clathrin-mediated endocytosis and the endosome network using inhibitor feeding, antibody blocking and dsRNA silencing. We monitored the quantities of TYLCV in the whitefly and virus transmission efficiency...
January 2, 2017: Virology
https://www.readbyqxmd.com/read/28049062/adenovirus-transduction-more-complicated-than-receptor-expression
#10
Priyanka Sharma, Prithy C Martis, Katherine J D A Excoffon
The abundance and accessibility of a primary virus receptor are critical factors that impact the susceptibility of a host cell to virus infection. The Coxsackievirus and adenovirus receptor (CAR) has two transmembrane isoforms that occur due to alternative splicing and differ in localization and function in polarized epithelia. To determine the relevance of isoform-specific expression across cell types, the abundance and localization of both isoforms were determined in ten common cell lines, and correlated with susceptibility to adenovirus transduction relative to polarized primary human airway epithelia...
December 31, 2016: Virology
https://www.readbyqxmd.com/read/28043025/nf-%C3%AE%C2%BAb-activation-is-cell-type-specific-in-the-heart
#11
Efraín E Rivera-Serrano, Barbara Sherry
Viral myocarditis is common and can progress to cardiac failure. Cardiac cell pro-inflammatory responses are critical for viral clearance, however sustained inflammatory responses contribute to cardiac damage. The transcription factor NF-κB regulates expression of many pro-inflammatory cytokines, but basal and induced activation of NF-κB in different cardiac cell types have not been compared. Here, we used primary cultures of cardiac myocytes and cardiac fibroblasts to identify cardiac cell type-specific events...
December 30, 2016: Virology
https://www.readbyqxmd.com/read/28039799/adenovirus-vectored-foot-and-mouth-disease-vaccine-confers-early-and-full-protection-against-fmdv-o1-manisa-in-swine
#12
Ignacio Fernandez-Sainz, Gisselle N Medina, Elizabeth Ramirez-Medina, Marla J Koster, Marvin J Grubman, Teresa de Los Santos
A human adenovirus (Ad5) vectored foot-and-mouth disease virus (FMDV) O1-Manisa subunit vaccine (Ad5-O1Man) was engineered to deliver FMDV O1-Manisa capsid and capsid-processing proteins. Swine inoculated with Ad5-O1Man developed an FMDV-specific humoral response as compared to animals inoculated with an empty Ad5-vector. Vaccinated animals were completely protected against homologous challenge at 7 or 21 days post-vaccination. Potency studies exhibited a PD50 of about 10(7) pfu/animal while a dose of 4×10(7)pfu/animal fully protected swine against FMDV intradermal challenge...
December 28, 2016: Virology
https://www.readbyqxmd.com/read/28038412/enhanced-virulence-of-clade-2-3-2-1-highly-pathogenic-avian-influenza-a-h5n1-viruses-in-ferrets
#13
Melissa B Pearce, Claudia Pappas, Kortney M Gustin, C Todd Davis, Mary J Pantin-Jackwood, David E Swayne, Taronna R Maines, Jessica A Belser, Terrence M Tumpey
Sporadic avian to human transmission of highly pathogenic avian influenza (HPAI) A(H5N1) viruses necessitates the analysis of currently circulating and evolving clades to assess their potential risk. Following the spread and sustained circulation of clade 2 viruses across multiple continents, numerous subclades and genotypes have been described. To better understand the pathogenesis associated with the continued diversification of clade 2A(H5N1) influenza viruses, we investigated the relative virulence of eleven human and poultry isolates collected from 2006 to 2013 by determining their ability to cause disease in the ferret model...
December 27, 2016: Virology
https://www.readbyqxmd.com/read/28027479/characterization-of-founder-viruses-in-very-early-siv-rectal-transmission
#14
Zhe Yuan, Fangrui Ma, Andrew J Demers, Dong Wang, Jianqing Xu, Mark G Lewis, Qingsheng Li
: A better understanding of HIV-1 transmission is critical for developing preventative strategies. To that end, we analyzed 524 full-length env sequences of SIVmac251 at 6 and 10 days post intrarectal infection of rhesus macaques. There was no tissue compartmentalization of founder viruses across plasma, rectal and distal lymphatic tissues for most animals; however one animal has evidence of virus tissue compartmentalization. Despite identical viral inoculums, founder viruses were animal-specific, primarily derived from rare variants in the inoculum, and have a founder virus signature that can distinguish dominant founder variants from minor founder or untransmitted variants in the inoculum...
December 24, 2016: Virology
https://www.readbyqxmd.com/read/28027478/a-conserved-region-in-the-closterovirus-1a-polyprotein-drives-extensive-remodeling-of-endoplasmic-reticulum-membranes-and-induces-motile-globules-in-nicotiana-benthamiana-cells
#15
V A Gushchin, D G Karlin, A V Makhotenko, A V Khromov, T N Erokhina, A G Solovyev, S Yu Morozov, A A Agranovsky
In infected plant cells, closterovirus replicative polyproteins 1a and 1ab drive membrane remodeling and formation of multivesicular replication platforms. Polyprotein 1a contains a variable Central Region (CR) between the methyltransferase and helicase domains. In a previous study, we have found that transient expression of the Beet yellows virus CR-2 segment (aa 1305-1494) in Nicotiana benthamiana induces the formation of ~1µm mobile globules originating from the ER membranes. In the present study, sequence analysis has shown that a part of the CR named the "Zemlya region" (overlapping the CR-2), is conserved in all members of the Closterovirus genus and contains a predicted amphipathic helix (aa 1368-1385)...
December 24, 2016: Virology
https://www.readbyqxmd.com/read/28024225/evolutionary-dynamic-of-antigenic-residues-on-influenza-b-hemagglutinin
#16
Ornpreya Suptawiwat, Khwansiri Ninpan, Chompunuch Boonarkart, Kanyarat Ruangrung, Prasert Auewarakul
Hemagglutinin (HA) of seasonal influenza virus evolves under positive selection pressure exerted by host immunity. It was previously shown that antigenic drift in different influenza B sublineages during different time periods distributed unevenly among different epitopes, and that more recent viruses up to 2007 might have their antigenic drift more focused on certain epitope. We further analyzed whether more recent influenza B viruses up to 2016 followed that same pattern of antigenic evolution. By using Shannon entropy and relative entropy to characterize HA antigenic epitopes, the most recent viruses of both Victoria and Yamagata lineages had residues with high relative entropy located most frequently on the 120-loop region...
December 23, 2016: Virology
https://www.readbyqxmd.com/read/28013103/ebola-virus-vp35-blocks-stress-granule-assembly
#17
Valerie Le Sage, Alessandro Cinti, Stephen McCarthy, Raquel Amorim, Shringar Rao, Gian Luca Daino, Enzo Tramontano, Donald R Branch, Andrew J Mouland
Stress granules (SGs) are dynamic cytoplasmic aggregates of translationally silenced mRNAs that assemble in response to environmental stress. SGs appear to play an important role in antiviral innate immunity and many viruses have evolved to block or subvert SGs components for their own benefit. Here, we demonstrate that intracellular Ebola virus (EBOV) replication and transcription-competent virus like particles (trVLP) infection does not lead to SG assembly but leads to a blockade to Arsenite-induced SG assembly...
December 22, 2016: Virology
https://www.readbyqxmd.com/read/28006671/recapitulation-of-treatment-response-patterns-in-a-novel-humanized-mouse-model-for-chronic-hepatitis-b-virus-infection
#18
Benjamin Y Winer, Tiffany Huang, Benjamin E Low, Cindy Avery, Mihai-Alexandru Pais, Gabriela Hrebikova, Evelyn Siu, Luis Chiriboga, Michael V Wiles, Alexander Ploss
There are ~350 million chronic carriers of hepatitis B (HBV). While a prophylactic vaccine and drug regimens to suppress viremia are available, chronic HBV infection is rarely cured. HBV's limited host tropism leads to a scarcity of susceptible small animal models and is a hurdle to developing curative therapies. Mice that support engraftment with human hepatoctyes have traditionally been generated through crosses of murine liver injury models to immunodeficient backgrounds. Here, we describe the disruption of fumarylacetoacetate hydrolase directly in the NOD Rag1(-/-) IL2RγNULL (NRG) background using zinc finger nucleases...
December 19, 2016: Virology
https://www.readbyqxmd.com/read/28006670/new-highly-divergent-plum-pox-virus-isolates-infecting-sour-cherry-in-russia
#19
Sergei Chirkov, Peter Ivanov, Anna Sheveleva, Alexander Zakubanskiy, Gennady Osipov
Unusual Plum pox virus (PPV) isolates (named Tat isolates) were discovered on sour cherry (Prunus cerasus) in Russia. They failed to be recognized by RT-PCR using commonly employed primers specific to the strains C or CR (the only ones that proved able to infect sour cherry) as well as to the strains M and W. Some of them can be detected by RT-PCR using the PPV-D-specific primers P1/PD or by TAS-ELISA with the PPV-C-specific monoclonal antibody AC. Phylogenetic analysis of the 3'-terminal genomic region assigned the Tat isolates into the cluster of cherry-adapted strains...
December 19, 2016: Virology
https://www.readbyqxmd.com/read/27992765/kinetics-of-the-association-of-dengue-virus-capsid-protein-with-the-granular-component-of-nucleolus
#20
Ashish Kumar Tiwary, D Cecilia
Dengue virus (DENV) replicates in the cytoplasm but translocation of the capsid protein (C) to the nucleoli of infected cells has been shown to facilitate virus multiplication for DENV-2. This study demonstrates that the nucleolar localization of C occurs with all four serotypes of DENV. The interaction of C with the nucleolus was found to be dynamic with a mobile fraction of 66% by FRAP. That the C shuttled between the nucleus and cytoplasm was suggested by FLIP and translation inhibition experiments. Colocalization with B23 indicated that DENV C targeted the granular component (GC) of the nucleolus...
December 16, 2016: Virology
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