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https://www.readbyqxmd.com/read/28299895/deep-sequencing-and-variant-analysis-of-an-italian-pathogenic-field-strain-of-equine-infectious-anaemia-virus
#1
K Cappelli, R F Cook, V Stefanetti, F Passamonti, G L Autorino, M T Scicluna, M Coletti, A Verini Supplizi, S Capomaccio
Equine infectious anaemia virus (EIAV) is a lentivirus with an almost worldwide distribution that causes persistent infections in equids. Technical limitations have restricted genetic analysis of EIAV field isolates predominantly to gag sequences resulting in very little published information concerning the extent of inter-strain variation in pol, env and the three ancillary open reading frames (ORFs). Here, we describe the use of long-range PCR in conjunction with next-generation sequencing (NGS) for rapid molecular characterization of all viral ORFs and known transcription factor binding motifs within the long terminal repeat of two EIAV isolates from the 2006 Italian outbreak...
March 15, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/28298605/cxcr5-dependent-entry-of-cd8-t-cells-into-rhesus-macaque-b-cell-follicles-achieved-through-t-cell-engineering
#2
Victor I Ayala, Claire Deleage, Matthew T Trivett, Sumiti Jain, Lori V Coren, Matthew W Breed, Joshua A Kramer, James A Thomas, Jacob D Estes, Jeffrey D Lifson, David E Ott
Follicular helper CD4 T cells, TFH, residing in B-cell follicles within secondary lymphoid tissues, are readily infected by AIDS viruses and are a major source of persistent virus despite relative control of viral replication. This persistence is due at least in part to a relative exclusion of effective antiviral CD8 T cells from B-cell follicles. To determine whether CD8 T cells could be engineered to enter B-cell follicles, we genetically modified unselected CD8 T cells to express CXCR5, the chemokine receptor implicated in cellular entry into B-cell follicles...
March 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28287115/efficient-control-of-chronic-lcmv-infection-by-a-cd4-t-cell-epitope-based-heterologous-prime-boost-vaccination-in-a-murine-model
#3
Ran He, Xinxin Yang, Cheng Liu, Xiangyu Chen, Lin Wang, Minglu Xiao, Jianqiang Ye, Yuzhang Wu, Lilin Ye
CD4(+) T cells are essential for sustaining CD8(+) T cell responses during a chronic infection. The adoptive transfer of virus-specific CD4(+) T cells has been shown to efficiently rescue exhausted CD8(+) T cells. However, the question of whether endogenous virus-specific CD4(+) T cell responses can be enhanced by certain vaccination strategies and subsequently reinvigorate exhausted CD8(+) T cells remains unexplored. In this study, we developed a CD4(+) T cell epitope-based heterologous prime-boost immunization strategy and examined the efficacy of this strategy using a mouse model of chronic lymphocytic choriomeningitis virus (LCMV) infection...
March 13, 2017: Cellular & Molecular Immunology
https://www.readbyqxmd.com/read/28278237/zika-virus-infection-of-rhesus-macaques-leads-to-viral-persistence-in-multiple-tissues
#4
Alec J Hirsch, Jessica L Smith, Nicole N Haese, Rebecca M Broeckel, Christopher J Parkins, Craig Kreklywich, Victor R DeFilippis, Michael Denton, Patricia P Smith, William B Messer, Lois M A Colgin, Rebecca M Ducore, Peta L Grigsby, Jon D Hennebold, Tonya Swanson, Alfred W Legasse, Michael K Axthelm, Rhonda MacAllister, Clayton A Wiley, Jay A Nelson, Daniel N Streblow
Zika virus (ZIKV), an emerging flavivirus, has recently spread explosively through the Western hemisphere. In addition to symptoms including fever, rash, arthralgia, and conjunctivitis, ZIKV infection of pregnant women can cause microcephaly and other developmental abnormalities in the fetus. We report herein the results of ZIKV infection of adult rhesus macaques. Following subcutaneous infection, animals developed transient plasma viremia and viruria from 1-7 days post infection (dpi) that was accompanied by the development of a rash, fever and conjunctivitis...
March 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28217776/iron-acquisition-in-fungal-pathogens-of-humans
#5
Gaurav Bairwa, Won Hee Jung, James W Kronstad
The devastating infections that fungal pathogens cause in humans are underappreciated relative to viral, bacterial and parasitic diseases. In recent years, the contributions to virulence of reductive iron uptake, siderophore-mediated uptake and heme acquisition have been identified in the best studied and most life-threatening fungal pathogens: Candida albicans, Cryptococcus neoformans and Aspergillus fumigatus. In particular, exciting new work illustrates the importance of iron acquisition from heme and hemoglobin in the virulence of pathogenic yeasts...
February 20, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28216237/development-of-an-anti-ferret-cd4-monoclonal-antibody-for-the-characterisation-of-ferret-t-lymphocytes
#6
Daniel S Layton, Xiaowen Xiao, John D Bentley, Louis Lu, Cameron R Stewart, Andrew G D Bean, Timothy E Adams
The ferret is an established animal model for a number of human respiratory viral infections, such as influenza virus and more recently, Ebola virus. However, a paucity of immunological reagents has hampered the study of cellular immune responses. Here we describe the development and characterisation of a novel monoclonal antibody (mAb) against the ferret CD4 antigen and the characterisation of ferret CD4 T lymphocytes. Recombinant production and purification of the ferret CD4 ectodomain soluble protein allowed hybridoma generation and the generation of a mAb (FeCD4) showing strong binding to ferret CD4 protein and lymphoid cells by flow cytometry...
February 16, 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28213135/genetic-variants-in-the-peripheral-auditory-system-significantly-affect-adult-cochlear-implant-performance
#7
A Eliot Shearer, Robert W Eppsteiner, Kathy Frees, Viral Tejani, Christina M Sloan-Heggen, Carolyn Brown, Paul Abbas, Camille Dunn, Marlan R Hansen, Bruce J Gantz, Richard J H Smith
BACKGROUND: Cochlear implantation is an effective habilitation modality for adults with significant hearing loss. However, post-implant performance is variable. A portion of this variance in outcome can be attributed to clinical factors. Recent physiological studies suggest that the health of the spiral ganglion also impacts post-operative cochlear implant outcomes. The goal of this study was to determine whether genetic factors affecting spiral ganglion neurons may be associated with cochlear implant performance...
February 15, 2017: Hearing Research
https://www.readbyqxmd.com/read/28196962/spatial-and-temporal-analysis-of-alphavirus-replication-and-assembly-in-mammalian-and-mosquito-cells
#8
Joyce Jose, Aaron B Taylor, Richard J Kuhn
Sindbis virus (SINV [genus Alphavirus, family Togaviridae]) is an enveloped, mosquito-borne virus. Alphaviruses cause cytolytic infections in mammalian cells while establishing noncytopathic, persistent infections in mosquito cells. Mosquito vector adaptation of alphaviruses is a major factor in the transmission of epidemic strains of alphaviruses. Though extensive studies have been performed on infected mammalian cells, the morphological and structural elements of alphavirus replication and assembly remain poorly understood in mosquito cells...
February 14, 2017: MBio
https://www.readbyqxmd.com/read/28181036/ddx50-inhibits-the-replication-of-dengue-virus-2-by-upregulating-ifn-%C3%AE-production
#9
Peijun Han, Wei Ye, Xin Lv, Hongwei Ma, Daihui Weng, Yangchao Dong, Linfeng Cheng, Hesong Chen, Liang Zhang, Zhikai Xu, Yingfeng Lei, Fanglin Zhang
Dengue virus (DENV) infects approximately 390 million people per year, and each of the four DENV serotypes (DENV-1, DENV-2, DENV-3, and DENV-4) is capable of causing infection. At present, there is no antiviral drug available for the treatment of DENV. Several DExD/H-box helicases have been shown to be involved in the antiviral immune response or viral replication. In the present study, we investigated the role of DDX50 in DENV-2 RNA replication. Our data showed that the level of DENV-2 RNA increased in DDX50 knockdown cells during an early stage of viral infection and decreased in DDX50-overexpressing cells...
February 8, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28159789/cross-comparison-of-human-wastewater-associated-molecular-markers-in-relation-to-fecal-indicator-bacteria-and-enteric-viruses-in-recreational-beach-waters
#10
B Hughes, D Beale, P G Dennis, S Cook, W Ahmed
Detecting human wastewater contamination in recreational waters is of critical importance to regulators due to the risks posed to public health. To identify such risks, human wastewater associated microbial source tracking (MST) markers have been developed. At present, however, greater understanding of the suitability of these markers for the detection of diluted human wastewater in environmental waters is necessary to predict risk. Here, we compared the process limit of detection (PLOD) and quantification (PLOQ) of six human wastewater associated MST markers [Bacteroides HF183 (HF183), E...
February 3, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28151955/predicting-ebola-severity-a-clinical-prioritization-score-for-ebola-virus-disease
#11
Mary-Anne Hartley, Alyssa Young, Anh-Minh Tran, Harry Henry Okoni-Williams, Mohamed Suma, Brooke Mancuso, Ahmed Al-Dikhari, Mohamed Faouzi
BACKGROUND: Despite the notoriety of Ebola virus disease (EVD) as one of the world's most deadly infections, EVD has a wide range of outcomes, where asymptomatic infection may be almost as common as fatality. With increasingly sensitive EVD diagnosis, there is a need for more accurate prognostic tools that objectively stratify clinical severity to better allocate limited resources and identify those most in need of intensive treatment. METHODS/PRINCIPAL FINDINGS: This retrospective cohort study analyses the clinical characteristics of 158 EVD(+) patients at the GOAL-Mathaska Ebola Treatment Centre, Sierra Leone...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28118207/rectal-microbiota-among-hiv-uninfected-untreated-hiv-and-treated-hiv-infected-in-nigeria
#12
Rebecca G Nowak, Søren M Bentzen, Jacques Ravel, Trevor A Crowell, Wuese Dauda, Bing Ma, Hongjie Liu, William A Blattner, Stefan D Baral, Manhattan E Charurat
OBJECTIVE: Untreated advanced HIV infection alters the gut microbiota, but it is unclear whether antiretroviral therapy (ART) reverses these changes. We compared the composition of the rectal microbiota among three groups of men who have sex with men (MSM): HIV-uninfected, untreated HIV, and ART-treated HIV-infected. DESIGN: A cross-sectional study was conducted among 130 MSM (55 HIV-uninfected, 41 untreated HIV, and 34 ART-treated HIV) in Abuja, Nigeria. METHODS: Bacterial 16S rRNA genes were amplified from rectal swabs, sequenced and clustered into Genera-level operational taxonomic units...
March 27, 2017: AIDS
https://www.readbyqxmd.com/read/28112080/a-dual-laser-scanning-confocal-and-transmission-electron-microscopy-analysis-of-the-intracellular-localization-aggregation-and-particle-formation-of-african-horse-sickness-virus-major-core-protein-vp7
#13
Gayle V Wall, Daria A Rutkowska, Eshchar Mizrachi, Henk Huismans, Vida van Staden
The bulk of the major core protein VP7 in African horse sickness virus (AHSV) self-assembles into flat, hexagonal crystalline particles in a process appearing unrelated to viral replication. Why this unique characteristic of AHSV VP7 is genetically conserved, and whether VP7 aggregation and particle formation have an effect on cellular biology or the viral life cycle, is unknown. Here we investigated how different small peptide and enhanced green fluorescent protein (eGFP) insertions into the VP7 top domain affected VP7 localization, aggregation, and particle formation...
January 23, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28099077/disease-complexity-in-a-declining-alaskan-muskox-ovibos-moschatus-population
#14
Josephine A Afema, Kimberlee B Beckmen, Stephen M Arthur, Kathy Burek Huntington, Jonna A K Mazet
The muskox ( Ovibos moschatus ) population inhabiting the eastern North Slope (ENS) of Alaska declined dramatically during 1999-2006, whereas populations in western Alaska (WA) were stable or increasing. To understand morbidity and mortality factors contributing to the decline, Alaska Department of Fish and Game conducted pathologic investigations of carcasses from 2005 until 2008. Additionally, archived sera from both ENS and WA muskoxen collected during 1984-1992, before the documented beginning of the ENS decline; sera collected during 2000, near the beginning of the decline; and contemporary sera (from live capture-release, adult females) collected during 2006, 2007, and 2008 were analyzed to determine whether prevalence of antibody to potential pathogens differed in the two areas or changed over time...
January 18, 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/28094093/achiralpentagonalpolyhedralframework-forcharacterizingviruscapsidstructures
#15
REVIEW
Aditya Raguram, V Sasisekharan, Ram Sasisekharan
Recent developments of rational strategies for the design of antiviral therapies, including monoclonal antibodies (mAbs), have naturally relied extensively on available viral structural information. As new strategies continue to be developed, it is equally important to continue to refine our understanding and interpretation of viral structural data. There are known limitations to the traditional (Caspar-Klug) theory for describing virus capsid structures that involves subdividing a capsid into triangular subunits...
January 13, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28088189/mars-improving-multiple-circular-sequence-alignment-using-refined-sequences
#16
Lorraine A K Ayad, Solon P Pissis
BACKGROUND: A fundamental assumption of all widely-used multiple sequence alignment techniques is that the left- and right-most positions of the input sequences are relevant to the alignment. However, the position where a sequence starts or ends can be totally arbitrary due to a number of reasons: arbitrariness in the linearisation (sequencing) of a circular molecular structure; or inconsistencies introduced into sequence databases due to different linearisation standards. These scenarios are relevant, for instance, in the process of multiple sequence alignment of mitochondrial DNA, viroid, viral or other genomes, which have a circular molecular structure...
January 14, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28069499/precise-manipulation-of-biophysical-particle-parameters-enables-control-of-proinflammatory-cytokine-production-in-presence-of-tlr-3-and-4-ligands
#17
Yoshinori Kakizawa, Jung Seok Lee, Brendan Bell, Tarek M Fahmy
The biophysical parameters governing nanoparticle (NP)-cell interactions significantly affect biological responses, particularly in the application of NP-based immunotherapeutics. Modulation of the surface biophysical character of NPs can be achieved via introduction of amino acids, which offer the ability to fine tune a range of biophysical parameters of interest. We employed this approach using monodisperse silica NPs coated with numerous poly(amino acid)s (PAAs). The NPs were incubated with dendritic cells (DCs) in conjunction with TLR ligands and production of IL-1β from DCs and IFNγ from T cells primed by these DCs were measured...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28063620/-the-virological-and-epidemiological-aspects-of-human-adenoviral-conjunctivitis-in-tunisia
#18
N Fedaoui, N Ben Ayed, A Ben Yahia, L Matri, L Nacef, H Triki
Human adenoviruses (HAdV) are the main cause of viral conjunctivitis. In Tunisia and North Africa more generally, there is no regular nationwide surveillance program that monitors viruses causing conjunctivitis and keratoconjunctivitis. In this study, we report the results of HAdV screening in conjunctival samples collected for over 14 years in Tunisia. A total of 282 conjunctival samples received between 2000 and 2013 were investigated. Detection and identification of genotype were performed by PCR-sequencing at the hexon gene; 64...
January 4, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28050723/computational-identification-of-novel-entry-inhibitor-scaffolds-mimicking-primary-receptor-cd4-of-hiv-1-gp120
#19
Alexander M Andrianov, Ivan A Kashyn, Alexander V Tuzikov
Virtual screening of novel entry inhibitor scaffolds mimicking primary receptor CD4 of HIV-1 gp120 was carried out in conjunction with evaluation of their potential inhibitory activity by molecular modeling. To do this, pharmacophore models presenting different sets of the hotspots of cellular receptor CD4 for its interaction with gp120 were generated. These models were used as the templates for identification of CD4-mimetic candidates by the pepMMsMIMIC screening platform. Complexes of these candidates with gp120 were built by high-throughput ligand docking and their stability was estimated by molecular dynamics simulations and binding free energy calculations...
January 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28031371/screening-for-novel-small-molecule-inhibitors-targeting-the-assembly-of-influenza-virus-polymerase-complex-by-a-bimolecular-luminescence-complementation-based-reporter-system
#20
Chunfeng Li, Zining Wang, Yang Cao, Lulan Wang, Jingyun Ji, Zhigao Chen, Tao Deng, Taijiao Jiang, Genhong Cheng, F Xiao-Feng Qin
Influenza virus RNA-dependent RNA polymerase consists of three viral protein subunits: PA, PB1, and PB2. Protein-protein interactions (PPIs) of these subunits play pivotal roles in assembling the functional polymerase complex, which is essential for the replication and transcription of influenza virus RNA. Here we developed a highly specific and robust bimolecular luminescence complementation (BiLC) reporter system to facilitate the investigation of influenza virus polymerase complex formation. Furthermore, by combining computational modeling and the BiLC reporter assay, we identified several novel small-molecule compounds that selectively inhibited PB1-PB2 interaction...
March 1, 2017: Journal of Virology
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