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Virology

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https://www.readbyqxmd.com/read/28719835/silencing-the-tobacco-gene-for-rna-dependent-rna-polymerase-1-and-infection-by-potato-virus-y-cause-remodeling-of-cellular-organelles
#1
Farshad Rakhshandehroo, Saeed Rezaee, Peter Palukaitis
RNA-dependent RNA polymerase 1 (RDR1) has been shown to be involved in DNA methylation, RNA silencing and regulating expression of other genes. RDR1 gene expression is stimulated by infection with potato virus Y° (PVY). Transgenic Nicotiana tabacum plants silenced for RDR1 gene expression showed morphological changes in mesophyll cells, associated with remodeling of the nuclei, chloroplasts and mitochondria. RDR1 silencing led to decreased nuclear size, increased heterochromatin content and aggregation, decreased numbers of chloroplasts, plus changes in shape, internal structures and integrity of chloroplasts and mitochondria...
July 15, 2017: Virology
https://www.readbyqxmd.com/read/28715654/generation-of-stable-infectious-clones-of-plant-viruses-by-using-rhizobium-radiobacter-for-both-cloning-and-inoculation
#2
Decai Tuo, Lanlan Fu, Wentao Shen, Xiaoying Li, Peng Zhou, Pu Yan
A novel Rhizobium radiobacter (synonym Agrobacterium tumefaciens)-mediated approach was developed to generate stable infectious clones of plant viruses. This method uses R. radiobacter for both cloning and inoculation of infectious clones, bypassing the requirement of cloning in E. coli to avoid the instability. Only three steps are included in this method: (i) construct viral genome-encoding plasmids in vitro by one-step Gibson assembly; (ii) transform the assembled DNA products into R. radiobacter; (iii) inoculate plants with the R...
July 14, 2017: Virology
https://www.readbyqxmd.com/read/28715653/inhibition-of-nf-%C3%AE%C2%BAb-activity-by-the-porcine-epidemic-diarrhea-virus-nonstructural-protein-1-for-innate-immune-evasion
#3
Qingzhan Zhang, Jinyou Ma, Dongwan Yoo
Porcine epidemic diarrhea virus emerged in the US is known to suppress the type I interferons response during infection. In the present study using porcine epithelial cells, we showed that PEDV inhibited both NF-κB and proinflammatory cytokines. PEDV blocked the p65 activation in infected cells and suppressed the PRD II-mediated NF-κB activity. Of the total of 22 viral proteins, nine proteins were identified as NF-κB antagonists, and nsp1 was the most potent suppressor of proinflammatory cytokines. Nsp1 interfered the phosphorylation and degradation of IκBα, and thus blocked the p65 activation...
July 14, 2017: Virology
https://www.readbyqxmd.com/read/28715652/linkage-between-the-leader-sequence-and-leader-rna-production-in-borna-disease-virus-infected-cells
#4
Tomoyuki Honda, Kozue Sofuku, Shohei Kojima, Yusuke Yamamoto, Naohiro Ohtaki, Keizo Tomonaga
The 3'-untranslated region (UTR) of the non-segmented, negative-strand (NNS) RNA viral genome is called the leader sequence, and functions as the promoter for viral replication and transcription. NNS RNA viruses also use the sequence as a template to synthesize leader RNAs (leRNAs) with unknown functions. Borna disease virus (BDV) is unique because it establishes a persistent infection and replicates in the nucleus. No report has yet demonstrated the presence of leRNAs during BDV infection. Here, we report that BDV synthesizes leRNAs from the 3'-UTR of the genome...
July 14, 2017: Virology
https://www.readbyqxmd.com/read/28711653/highly-conserved-intragenic-hsv-2-sequences-results-from-next-generation-sequencing-of-hsv-2-ul-and-us-regions-from-genital-swabs-collected-from-3-continents
#5
Christine Johnston, Amalia Magaret, Pavitra Roychoudhury, Alexander L Greninger, Anqi Cheng, Kurt Diem, Matthew P Fitzgibbon, Meei-Li Huang, Stacy Selke, Jairam R Lingappa, Connie Celum, Keith R Jerome, Anna Wald, David M Koelle
INTRODUCTION: Understanding the variability in circulating herpes simplex virus type 2 (HSV-2) genomic sequences is critical to the development of HSV-2 vaccines. METHODS: Genital lesion swabs containing ≥ 10(7)log10 copies HSV DNA collected from Africa, the USA, and South America underwent next-generation sequencing, followed by K-mer based filtering and de novo genomic assembly. Sites of heterogeneity within coding regions in unique long and unique short (UL_US) regions were identified...
July 13, 2017: Virology
https://www.readbyqxmd.com/read/28710959/tobacco-mosaic-virus-infection-disproportionately-impacts-phloem-associated-translatomes-in-arabidopsis-thaliana-and-nicotiana-benthamiana
#6
Tamara D Collum, James N Culver
In this study we use vascular specific promoters and a translating ribosome affinity purification strategy to identify phloem associated translatome responses to infection by tobacco mosaic virus (TMV) in systemic hosts Arabidopsis thaliana ecotype Shahdara and Nicotiana benthamiana. Results demonstrate that in both hosts the number of translatome gene alterations that occurred in response to infection is at least four fold higher in phloem specific translatomes than in non-phloem translatomes. This finding indicates that phloem functions as a key responsive tissue to TMV infection...
July 12, 2017: Virology
https://www.readbyqxmd.com/read/28710958/japanese-encephalitis-virus-counteracts-bst2-restriction-via-its-envelope-protein-e
#7
Mei Li, Ping Wang, Zifeng Zheng, Kai Hu, Mudan Zhang, Xinmeng Guan, Ming Fu, Di Zhang, Wei Wang, Gengfu Xiao, Qinxue Hu, Yalan Liu
It has been well documented that BST2 restricts the release of enveloped viruses by cross-linking newly produced virions to the cell membrane. However, it is less clear whether and how BST2 inhibits the release of enveloped viruses which bud via the secretory pathway. Here, we demonstrated that BST2 restricts the release of Japanese encephalitis virus (JEV) whose budding occurs at the ER-Golgi intermediate compartment, and in turn, JEV infection downregulates BST2 expression. We further found that the JEV envelope protein E, but not other viral components, significantly downregulates BST2 with the viral protein M playing an auxiliary role in the process...
July 12, 2017: Virology
https://www.readbyqxmd.com/read/28710957/infection-and-colonization-of-nicotiana-benthamiana-by-grapevine-leafroll-associated-virus-3
#8
Cecilia A Prator, Chloe M Kashiwagi, Darko Vončina, Rodrigo P P Almeida
Grapevine leafroll disease is an increasing problem in all grape-growing regions of the world. The most widespread agent of the disease, Grapevine leafroll-associated virus 3 (GLRaV-3), has never been shown to infect species outside of the genus Vitis. Virus transmission to several plant species used as model systems was tested using the vine mealybug, Planococcus ficus. We show that GLRaV-3 is able to infect Nicotiana benthamiana. Working with GLRaV-3 infected N. benthamiana revealed distinct advantages in comparison with its natural host Vitis vinifera, yielding both higher viral protein and virion concentrations in western blot and transmission electron microscopy observations, respectively...
July 12, 2017: Virology
https://www.readbyqxmd.com/read/28709684/hairpin-structures-with-conserved-sequence-motifs-determine-the-3-ends-of-non-polyadenylated-invertebrate-iridovirus-transcripts
#9
İkbal Agah İnce, Gorben P Piljman, Just M Vlak, Monique M van Oers
Previously, we observed that the transcripts of Invertebrate iridescent virus 6 (IIV6) are not polyadenylated, in line with the absence of canonical poly(A) motifs (AATAAA) downstream of the open reading frames (ORFs) in the genome. Here, we determined the 3' ends of the transcripts of fifty-four IIV6 virion protein genes in infected Drosophila Schneider 2 (S2) cells. By using ligation-based amplification of cDNA ends (LACE) it was shown that the IIV6 mRNAs often ended with a CAUUA motif. In silico analysis showed that the 3'-untranslated regions of IIV6 genes have the ability to form hairpin structures (22-56 nt in length) and that for about half of all IIV6 genes these 3' sequences contained complementary TAATG and CATTA motifs...
July 11, 2017: Virology
https://www.readbyqxmd.com/read/28708973/concordance-of-beta-papillomavirus-across-anogenital-and-oral-anatomic-sites-of-men-the-him-study
#10
Emily M Nunes, Rossana V M López, Staci L Sudenga, Tarik Gheit, Massimo Tommasino, Maria L Baggio, Silvaneide Ferreira, Lenice Galan, Roberto C Silva, Eduardo Lazcano-Ponce, Anna R Giuliano, Luisa L Villa, Laura Sichero
We evaluated the concordance between β-HPVs detected in external genital skin, anal canal, and oral cavity specimens collected simultaneously from 717 men that were participating in the multinational HIM Study. Viral genotyping was performed using the Luminex technology. Species- and type-specific concordance was measured using kappa statistics for agreement. Overall, concordance of β-HPVs across sites was low and mainly observed among paired genital/anal canal samples. When grouped by species, solely β-4 HPVs showed moderate concordance in genital/anal pairs (κ = 0...
July 11, 2017: Virology
https://www.readbyqxmd.com/read/28704696/the-function-of-dna-binding-protein-nucleophosmin-in-aav-replication
#11
Stifani Satkunanathan, Robin Thorpe, Yuan Zhao
Adeno-associated viruses (AAV) contain minimal viral proteins necessary for their replication. During virus assembly, AAV acquire, inherently and submissively, various cellular proteins. Our previous studies identified the association of AAV vectors with the DNA binding protein nucleophosmin (NPM1). Nucleophosmin has been reported to enhance AAV infection by mobilizing AAV capsids into and out of the nucleolus, indicating the importance of NPM1 in the AAV life cycle; however the role of NPM1 in AAV production remains unknown...
July 10, 2017: Virology
https://www.readbyqxmd.com/read/28704695/emergence-of-the-asian-genotype-of-denv-1-in-south-india
#12
D Cecilia, J A Patil, M B Kakade, A Walimbe, K Alagarasu, B Anukumar, A Abraham
A large outbreak of dengue occurred in Tamil Nadu, South India in 2012 with 12,000 cases and CFR of 0.5%. Molecular characterization of virus present in the sera of dengue patients was undertaken to determine if there were changes in the virus population. All four serotypes were circulating but DENV-1 was dominant, present in 52% of the serotyped samples. Furthermore, the genotype of only DENV-1 had changed; the Asian genotype had displaced the American/African. Phylogenetic analysis revealed that the Asian genotype was introduced from Singapore and shared 99% similarity with viruses, associated with large outbreaks in Singapore and Sri Lanka...
July 10, 2017: Virology
https://www.readbyqxmd.com/read/28689858/singapore-grouper-iridovirus-sgiv-tnfr-homolog-vp51-functions-as-a-virulence-factor-via-modulating-host-inflammation-response
#13
Yepin Yu, Youhua Huang, Songwei Ni, Lingli Zhou, Jiaxin Liu, Jingcheng Zhang, Xin Zhang, Yin Hu, Xiaohong Huang, Qiwei Qin
Virus encoded tumor necrosis factor receptor (TNFR) homologues are usually involved in immune evasion by regulating host immune response or cell death. Singapore grouper iridovirus (SGIV) is a novel ranavirus which causes great economic losses in aquaculture industry. Previous studies demonstrated that SGIV VP51, a TNFR-like protein regulated apoptotic process in VP51 overexpression cells. Here, we developed a VP51-deleted recombinant virus Δ51-SGIV by replacing VP51 with puro(R)-GFP. Deletion of VP51 resulted in the decrease of SGIV virulence, evidenced by the reduced replication in vitro and the decreased cumulative mortalities in Δ51-SGIV challenged grouper compared to WT-SGIV...
July 6, 2017: Virology
https://www.readbyqxmd.com/read/28689087/the-histone-deacetylase-inhibitor-saha-simultaneously-reactivates-hiv-1-from-latency-and-up-regulates-nkg2d-ligands-sensitizing-for-natural-killer-cell-cytotoxicity
#14
Maria Giovanna Desimio, Erica Giuliani, Margherita Doria
In pilot HIV-1 eradication studies, patients' immune responses were ineffective at killing viral reservoirs reactivated through latency reversing agents (LRAs) like suberoylanilide hydroxamic acid (SAHA). We hypothesized that T cells harboring reactivated HIV-1 express MIC and ULBP ligands for the activating NKG2D receptor of natural killer (NK) cells. Here, we demonstrated that MICA/B and ULBP2 are induced by SAHA on primary T cells harboring reactivated virus. Using latently HIV-1-infected J-Lat 6.3/8.4/9...
July 6, 2017: Virology
https://www.readbyqxmd.com/read/28689086/validation-of-reference-genes-for-quantifying-changes-in-gene-expression-in-virus-infected-tobacco
#15
Eseul Baek, Ju-Yeon Yoon, Peter Palukaitis
To facilitate quantification of gene expression changes in virus-infected tobacco plants, eight housekeeping genes were evaluated for their stability of expression during infection by one of three systemically-infecting viruses (cucumber mosaic virus, potato virus X, potato virus Y) or a hypersensitive-response-inducing virus (tobacco mosaic virus; TMV) limited to the inoculated leaf. Five reference-gene validation programs were used to establish the order of the most stable genes for the systemically-infecting viruses as ribosomal protein L25 > β-Tubulin > Actin, and the least stable genes Ubiquitin-conjugating enzyme (UCE) < PP2A < GAPDH...
July 6, 2017: Virology
https://www.readbyqxmd.com/read/28689085/identification-and-characterization-of-a-naturally-occurring-efficiently-cleaved-membrane-bound-clade-a-hiv-1-env-suitable-for-immunogen-design-with-properties-comparable-to-membrane-bound-bg505
#16
Supratik Das, Saikat Boliar, Sweety Samal, Shubbir Ahmed, Tripti Shrivastava, Brihaspati N Shukla, Sandeep Goswami, Manish Bansal, Bimal K Chakrabarti
Efficient cleavage of HIV-1 Env gp160 into its constituent subunits correlates with selective binding to neutralizing antibodies and are the closest mimetic of native, functional Envs. This was first demonstrated with the clade B Env, JRFL. The correlation between efficient cleavage and selective binding to neutralizing antibodies is the guiding principle for immunogen design for HIV vaccine. We have recently reported that Envs 4-2.J41 (clade C) and JRCSF (clade B) are also efficiently cleaved and show similar properties...
July 6, 2017: Virology
https://www.readbyqxmd.com/read/28689040/unsupervised-learning-techniques-reveal-heterogeneity-in-memory-cd8-t-cell-differentiation-following-acute-chronic-and-latent-viral-infections
#17
Mingyong Liu, Erik S Barton, Ryan N Jennings, Darby G Oldenburg, Juliann M Whirry, Douglas W White, Jason M Grayson
CD8(+) T lymphocytes are critical for the control of gammaherpesvirus latency. To determine how memory CD8(+) T cells generated during latency differ from those primed during acute or chronic viral infection, we adoptively transferred naive P14 CD8(+) T cells into uninfected recipients, and examined surface proteins, cytokines and transcription factors following infection with the Armstrong (acute) or Clone 13 (chronic) strains of lymphocytic choriomeningitis virus (LCMV), or murine gammaherpesvirus 68 (MHV68) expressing the LCMV epitope D(b)GP33-41...
July 6, 2017: Virology
https://www.readbyqxmd.com/read/28688346/improved-detection-of-bovine-viral-diarrhea-virus-in-bovine-lymphoid-cell-lines-using-primeflow-rna-assay
#18
Shollie M Falkenberg, Rohana P Dassanayake, John D Neill, Julia F Ridpath
Bovine viral diarrhea virus (BVDV) infections, whether as acute, persistent or contributing to co-infections, result in significant losses for cattle producers. Although, BVDV can be identified readily by real-time PCR and ELISA, detection and quantification of viral infection at the single cell level is extremely difficult. Detection at the single lymphoid cell level is important due to the immunomodulation that accompanies BVDV infection. A novel PrimeFlow RNA assay using in-situ detection of BVDV was evaluated...
July 5, 2017: Virology
https://www.readbyqxmd.com/read/28688268/tfeb-mediated-activation-of-the-lysosome-autophagy-system-affects-the-transduction-efficiency-of-adeno-associated-virus-2
#19
Lauren Popp, Eric Gomez, Whitney Orji, Michelle Ho, Junghae Suh, Laura Segatori
Adeno-associated virus (AAV)-mediated gene transfer is an appealing therapeutic option due to AAV's safety profile. Effective delivery of AAV's genetic cargo to the nucleus, however, requires evasion of host cell barriers, including cellular clearance mechanisms mediated by the lysosome-autophagy system. We used AAV serotype 2 to monitor the autophagic response to cellular internalization of AAV and to characterize the effect of AAV-induced activation of autophagy on transgene expression. We found AAV2 internalization to induce activation of transcription factor EB, a master regulator of autophagy and lysosomal biogenesis, and upregulation of the lysosome-autophagy system...
July 5, 2017: Virology
https://www.readbyqxmd.com/read/28686880/chicken-mannose-binding-lectin-has-antiviral-activity-towards-infectious-bronchitis-virus
#20
Weidong Zhang, Kim M Bouwman, Steven J van Beurden, Soledad R Ordonez, Martin van Eijk, Henk P Haagsman, M Hélène Verheije, Edwin J A Veldhuizen
Mannose binding lectin (MBL) is a collagenous C-type lectin, which plays an important role in innate immunity. It can bind to carbohydrates on the surface of a wide range of pathogens, including viruses. Here we studied the antiviral effect of recombinant chicken (rc)MBL against Infectious Bronchitis Virus (IBV), a highly contagious coronavirus of chicken. rcMBL inhibited in a dose-dependent manner the infection of BHK-21 cells by IBV-Beaudette, as detected by immunofluorescence staining of viral proteins and qPCR...
July 4, 2017: Virology
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