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https://www.readbyqxmd.com/read/28742481/the-interplay-between-dna-topology-and-accessory-factors-in-site-specific-recombination-in-bacteria-and-their-bacteriophages
#1
Charles J Dorman, Marina M Bogue
Site-specific recombination is employed widely in bacteria and bacteriophage as a basis for genetic switching events that control phenotypic variation. It plays a vital role in the life cycles of phages and in the replication cycles of chromosomes and plasmids in bacteria. Site-specific recombinases drive these processes using very short segments of identical (or nearly identical) DNA sequences. In some cases, the efficiencies of the recombination reactions are modulated by the topological state of the participating DNA sequences and by the availability of accessory proteins that shape the DNA...
December 1, 2016: Science Progress
https://www.readbyqxmd.com/read/28742148/hijacking-of-the-o-glcnaczyme-complex-by-the-htlv-1-tax-oncoprotein-facilitates-viral-transcription
#2
Damien Groussaud, Mostafa Khair, Armelle I Tollenaere, Laetitia Waast, Mei-Shiue Kuo, Marianne Mangeney, Christophe Martella, Yann Fardini, Solène Coste, Mouloud Souidi, Laurence Benit, Claudine Pique, Tarik Issad
The viral Tax oncoprotein plays a key role in both Human T-cell lymphotropic virus type 1 (HTLV-1)-replication and HTLV-1-associated pathologies, notably adult T-cell leukemia. Tax governs the transcription from the viral 5'LTR, enhancing thereby its own expression, via the recruitment of dimers of phosphorylated CREB to cAMP-response elements located within the U3 region (vCRE). In addition to phosphorylation, CREB is also the target of O-GlcNAcylation, another reversible post-translational modification involved in a wide range of diseases, including cancers...
July 24, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28742072/phaeoviruses-discovered-in-kelp-laminariales
#3
Dean A McKeown, Kim Stevens, Akira F Peters, Peter Bond, Glenn M Harper, Colin Brownlee, Murray T Brown, Declan C Schroeder
Phaeoviruses are latent double-stranded DNA viruses that insert their genomes into those of their brown algal (Phaeophyceae) hosts. So far these viruses are known only from members of the Ectocarpales, which are small and short-lived macroalgae. Here we report molecular and morphological evidence for a new Phaeovirus cluster, referred to as sub-group C, infecting kelps (Laminariales) of the genera Laminaria and Saccharina, which are ecologically and commercially important seaweeds. Epifluorescence and TEM observations indicate that the Laminaria digitata Virus (LdigV), the type species of sub-group C, targets the host nucleus for its genome replication, followed by gradual degradation of the chloroplast and assembly of virions in the cytoplasm of both vegetative and reproductive cells...
July 25, 2017: ISME Journal
https://www.readbyqxmd.com/read/28741996/transcriptome-changes-associated-with-tomato-spotted-wilt-virus-infection-in-various-life-stages-of-its-thrips-vector-frankliniella-fusca-hinds
#4
Anita Shrestha, Donald E Champagne, Albert K Culbreath, Dorith Rotenberg, Anna E Whitfield, Rajagopalbabu Srinivasan
Persistent propagative viruses maintain intricate interactions with their arthropod vectors. In this study, we investigated the transcriptome-level responses associated with a persistent propagative phytovirus infection in various life stages of its vector using an Illumina HiSeq sequencing platform. The pathosystem components included a Tospovirus, Tomato spotted wilt virus (TSWV), its insect vector, Frankliniella fusca (Hinds), and a plant host, Arachis hypogaea (L.). We assembled (de novo) reads from three developmental stage groups of virus-exposed and non-virus-exposed F...
July 26, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28741901/trends-in-hcv-treatment-uptake-efficacy-and-impact-on-liver-fibrosis-in-the-swiss-hiv-cohort-study
#5
Charles Béguelin, Annatina Suter, Enos Bernasconi, Jan Fehr, Helen Kovari, Heiner C Bucher, Marcel Stoeckle, Mathias Cavassini, Mathieu Rougemont, Patrick Schmid, Gilles Wandeler, Andri Rauch
BACKGROUND & AIMS: Hepatitis C virus (HCV) therapies with interferon-free second-generation direct-acting antiviral agents (DAAs) are highly effective and well tolerated. They have the potential to increase treatment eligibility and efficacy in HIV-infected patients. We assessed the impact of DAAs on treatment uptake, efficacy as well as its impact on the burden of liver disease in the Swiss HIV Cohort Study (SHCS). METHODS: We describe clinical and virological characteristics of patients treated with second generation DAAs...
July 25, 2017: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/28741727/placental-pericytes-and-cytomegalovirus-infectivity-implications-for-hcmv-placental-pathology-and-congenital-disease
#6
David M Aronoff, Hernan Correa, Lisa M Rogers, Ravit Arav-Boger, Donald J Alcendor
PROBLEM: Placental pericytes are essential for placental microvascular function, stability, and integrity. Mechanisms of human cytomegalovirus (HCMV) pathogenesis incorporating placental pericytes are unknown. METHOD OF STUDY: HCMV-infected placental tissue was stained by dual-labeled immunohistochemistry. Primary placental pericytes, cytotrophoblasts, and villous fibroblasts were exposed to HCMV; and infectivity was analyzed by microscopy and immunofluorescence...
July 25, 2017: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/28741149/the-role-of-peripheral-interleukin-6-in-the-development-of-acute-seizures-following-virus-encephalitis
#7
Matthew F Cusick, Jane E Libbey, Daniel J Doty, Ana Beatriz DePaula-Silva, Robert S Fujinami
Seizure disorders are often associated with infectious etiologies. Infection, via the intracerebral (i.c.) route, of C57BL/6J mice with the Daniels (DA) strain of Theiler's murine encephalomyelitis virus (TMEV) results in approximately 50% of the mice developing acute behavioral seizures. TMEV-DA is the wild-type strain of the virus that replicates within the parenchyma of the brain. A variant of TMEV-DA, TMEV-H101, does not replicate within the parenchyma of the brain. However, infection with TMEV-H101 via the i...
July 24, 2017: Journal of Neurovirology
https://www.readbyqxmd.com/read/28740569/dna-oncogenic-virus-induced-oxidative-stress-genomic-damage-and-aberrant-epigenetic-alterations
#8
REVIEW
Mankgopo Magdeline Kgatle, Catherine Wendy Spearman, Asgar Ali Kalla, Henry Norman Hairwadzi
Approximately 20% of human cancers is attributable to DNA oncogenic viruses such as human papillomavirus (HPV), hepatitis B virus (HBV), and Epstein-Barr virus (EBV). Unrepaired DNA damage is the most common and overlapping feature of these DNA oncogenic viruses and a source of genomic instability and tumour development. Sustained DNA damage results from unceasing production of reactive oxygen species and activation of inflammasome cascades that trigger genomic changes and increased propensity of epigenetic alterations...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28740520/vitamin-d-levels-and-their-impact-on-mineral-metabolism-in-hiv-infected-patients-an-exploratory-study
#9
Silvina Mastaglia, Dana Watson, Natalia Bello, Vanesa Fridman, Daniel Stecher, Beatriz Oliveri
Vitamin D has immunomodulating properties. The nuclear receptor for vitamin D is expressed in several immune cells, which convert 25-hydroxyvitamin D (25OHD) to the active form 1,25 hydroxyvitamin D [1,25(OH)2 D]. Under conditions of infection, 1,25(OH)2 D promotes production of cathelicidin (an antimicrobial peptide) in monocytes and activated macrophages. In vitro studies have shown the ability of cathelicidin to inhibit replication of human immunodeficiency virus (HIV-1) in T CD4 lymphocytes and macrophages...
January 2017: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/28738877/unexpected-complexity-in-the-interference-activity-of-a-cloned-influenza-defective-interfering-rna
#10
Bo Meng, Kirsten Bentley, Anthony C Marriott, Paul D Scott, Nigel J Dimmock, Andrew J Easton
BACKGROUND: Defective interfering (DI) viruses are natural antivirals made by nearly all viruses. They have a highly deleted genome (thus being non-infectious) and interfere with the replication of genetically related infectious viruses. We have produced the first potential therapeutic DI virus for the clinic by cloning an influenza A DI RNA (1/244) which was derived naturally from genome segment 1. This is highly effective in vivo, and has unexpectedly broad-spectrum activity with two different modes of action: inhibiting influenza A viruses through RNA interference, and all other (interferon-sensitive) respiratory viruses through stimulating interferon type I...
July 24, 2017: Virology Journal
https://www.readbyqxmd.com/read/28738454/-development-of-markov-models-for-economics-evaluation-of-strategies-on-hepatitis-b-vaccination-and-population-based-antiviral-treatment-in-china
#11
P C Yang, S X Zhang, P P Sun, Y L Cai, Y Lin, Y H Zou
Objective: To construct the Markov models to reflect the reality of prevention and treatment interventions against hepatitis B virus (HBV) infection, simulate the natural history of HBV infection in different age groups and provide evidence for the economics evaluations of hepatitis B vaccination and population-based antiviral treatment in China. Methods: According to the theory and techniques of Markov chain, the Markov models of Chinese HBV epidemic were developed based on the national data and related literature both at home and abroad, including the settings of Markov model states, allowable transitions and initial and transition probabilities...
July 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28737040/potential-of-small-molecule-fungal-metabolites-in-antiviral-chemotherapy
#12
Biswajit G Roy
Various viral diseases, such as acquired immunodeficiency syndrome, influenza, and hepatitis, have emerged as leading causes of human death worldwide. Scientific endeavor since invention of DNA-dependent RNA polymerase of pox virus in 1967 resulted in better understanding of virus replication and development of various novel therapeutic strategies. Despite considerable advancement in every facet of drug discovery process, development of commercially viable, safe, and effective drugs for these viruses still remains a big challenge...
July 23, 2017: Antiviral Chemistry & Chemotherapy
https://www.readbyqxmd.com/read/28736139/long-term-response-after-stopping-tenofovir-disoproxil-fumarate-in-non-cirrhotic-hbeag-negative-patients-finite-study
#13
Thomas Berg, Karl-Georg Simon, Stefan Mauss, Eckart Schott, Renate Heyne, Dietmar M Klass, Christoph Eisenbach, Tania Mara Welzel, Reinhart Zachoval, Gisela Felten, Julian Schulze-Zur-Wiesch, Markus Cornberg, Marjoleine L Op den Brouw, Belinda Jump, Hans Reiser, Lothar Gallo, Tobias Warger, Jörg Petersen
BACKGROUND & AIMS: There is currently no virological cure for chronic hepatitis B but successful nucleos(t)ide analogue (NA) therapy can suppress hepatitis B virus (HBV) DNA replication and, in some cases, result in HBsAg loss. Stopping NA therapy often leads to viral relapse and therefore life-long therapy is usually required. This study investigated the potential to discontinue tenofovir disoproxil fumarate (TDF) therapy in HBeAg-negative patients. METHODS: Non-cirrhotic HBeAg-negative patients who had received TDF for ≥4 years, with suppressed HBV DNA for ≥3...
July 20, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/28736077/replication-of-the-zika-virus-in-different-ipsc-derived-neuronal-cells-and-implications-to-assess-efficacy-of-antivirals
#14
Kristina Lanko, Kristel Eggermont, Abdulsamie Patel, Suzanne Kaptein, Leen Delang, Catherine M Verfaillie, Johan Neyts
Infections with the Zika virus (ZIKV) are responsible for congenital abnormalities and neurological disorders. We here demonstrate that ZIKV productively infects three types of human iPSC (induced pluripotent stem cells)-derived cells from the neural lineage, i.e. cortical and motor neurons as well as astrocytes. ZIKV infection results in all three cell types in the production of infectious virus particles and induces cytopathic effects (CPE). In cortical and motor neurons, an Asian isolate (PRVABC59) produced roughly 10-fold more virus than the prototypic African strain (MR766 strain)...
July 20, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28735348/analysis-of-the-cd8-t-cell-anti-hiv-activity-in-heterologous-cell-co-cultures-reveals-the-benefit-of-multiple-hla-class-i-matches
#15
M Scott Killian, Fernando Teque, Ramu Sudhagoni
CD8(+) T lymphocytes can reduce the production of human immunodeficiency virus 1 (HIV-1) by CD4(+) T cells by cytotoxic and non-cytotoxic mechanisms. To investigate the involvement of human leukocyte antigen (HLA) class I compatibility in anti-HIV responses, we co-cultured primary CD8(+) T cells, isolated from the peripheral blood of HIV-1-infected individuals, with panels of autologous and heterologous acutely HIV-1-infected primary CD4(+) T cells. Altogether, CD8(+) T cell anti-HIV activity was evaluated in more than 200 co-cultures...
July 22, 2017: Immunogenetics
https://www.readbyqxmd.com/read/28735115/the-c-terminal-region-of-the-turnip-mosaic-virus-p3-protein-is-essential-for-viral-infection-via-targeting-p3-to-the-viral-replication-complex
#16
Xiaoyan Cui, Hoda Yaghmaiean, Guanwei Wu, Xiaoyun Wu, Xin Chen, Greg Thorn, Aiming Wang
Like other positive-strand RNA viruses, plant potyviruses assemble viral replication complexes (VRCs) on modified cellular membranes. Potyviruses encode two membrane proteins, 6K2 and P3. The former is known to play pivotal roles in the formation of membrane-associated VRCs. However, P3 remains to be one of the least characterized potyviral proteins. The P3 cistron codes for P3 as well as P3N-PIPO which results from RNA polymerase slippage. In this study, we show that the P3N-PIPO of Turnip mosaic virus (TuMV) is required for viral cell-to-cell movement but not for viral replication...
July 20, 2017: Virology
https://www.readbyqxmd.com/read/28734654/schlafen-14-slfn14-is-a-novel-antiviral-factor-involved-in-the-control-of-viral-replication
#17
Rak-Kyun Seong, Seong-Wook Seo, Ji-Ae Kim, Sarah J Fletcher, Neil V Morgan, Mukesh Kumar, Young-Ki Choi, Ok Sarah Shin
Schlafen (SLFN) proteins have been suggested to play important functions in cell proliferation and immune cell development. In this study, we determined the antiviral activities of putative RNA-helicase domain-containing SLFN14. Murine SLFN14 expression was specifically induced by TLR3-mediated pathways and type I interferon (IFN) in RAW264.7 mouse macrophages. To examine the role of SLFN during viral infection, cells were infected with either wild-type PR8 or delNS1/PR8 virus. SLFN14 expression was specifically induced following influenza virus infection...
July 11, 2017: Immunobiology
https://www.readbyqxmd.com/read/28733876/human-papillomavirus-type-8-e7-protein-binds-nuclear-myosin-1c-and-downregulates-the-expression-of-pre-rrna
#18
Evelyn Oswald, Eileen Reinz, Renate Voit, François Aubin, Angel Alonso, Eeva Auvinen
Our aim was to search for new cellular binding partners for the E6 and E7 oncogenes of beta human papillomaviruses (HPV), whose direct role in skin carcinogenesis has not been thoroughly investigated. By employing glutathione S-transferase pulldown and coimmunoprecipitation, we identified nuclear myosin 1c as a binding partner of HPV 8 E7 protein. As nuclear myosin 1c is an essential component of the RNA polymerase I transcription complex, we studied the effects of HPV 8 E7 protein expression on ribosomal RNA (rRNA) expression...
July 21, 2017: Virus Genes
https://www.readbyqxmd.com/read/28733609/suppression-of-hbv-replication-by-the-expression-of-nickase-and-nuclease-dead-cas9
#19
Takeshi Kurihara, Takasuke Fukuhara, Chikako Ono, Satomi Yamamoto, Kentaro Uemura, Toru Okamoto, Masaya Sugiyama, Daisuke Motooka, Shota Nakamura, Masato Ikawa, Masashi Mizokami, Yoshihiko Maehara, Yoshiharu Matsuura
Complete removal of hepatitis B virus (HBV) DNA from nuclei is difficult by the current therapies. Recent reports have shown that a novel genome-editing tool using Cas9 with a single-guide RNA (sgRNA) system can cleave the HBV genome in vitro and in vivo. However, induction of a double-strand break (DSB) on the targeted genome by Cas9 risks undesirable off-target cleavage on the host genome. Nickase-Cas9 cleaves a single strand of DNA, and thereby two sgRNAs are required for inducing DSBs. To avoid Cas9-induced off-target mutagenesis, we examined the effects of the expressions of nickase-Cas9 and nuclease dead Cas9 (d-Cas9) with sgRNAs on HBV replication...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28733114/targeting-heat-shock-factor-1-as-an-antiviral-strategy-against-dengue-virus-replication-in-vitro-and-in-vivo
#20
Tsung-Ting Tsai, Chia-Ling Chen, Cheng-Chieh Tsai, Chiou-Feng Lin
Fever onset is correlated with viremia in dengue virus (DENV) patients. Heat shock factor 1 (HSF1), a heat stress response host transcription factor, plays a crucial role in regulating multiple cellular functions, as well as the onset of infectious diseases. This study evaluated the role of HSF1 in DENV replication as a means of regulating DENV infection in vitro and in vivo. DENV infection activated HSF1 in both Ca(2+) and protein kinase A-dependent manners. Inhibiting HSF1 effectively reduced DENV replication, not only in THP-1 cells but also in primary human monocytes...
July 18, 2017: Antiviral Research
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