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https://www.readbyqxmd.com/read/28715976/astrovirus-biology-and-pathogenesis
#1
Valerie Cortez, Victoria A Meliopoulos, Erik A Karlsson, Virginia Hargest, Cydney Johnson, Stacey Schultz-Cherry
Astroviruses are nonenveloped, positive-sense single-stranded RNA viruses that cause gastrointestinal illness. Although a leading cause of pediatric diarrhea, human astroviruses are among the least characterized enteric RNA viruses. However, by using in vitro methods and animal models to characterize virus-host interactions, researchers have discovered several important properties of astroviruses, including the ability of astrovirus capsid to act as an enterotoxin, disrupting the gut epithelial barrier. Improved animal models are needed to study this phenomenon, along with the pathogenesis of astroviruses, particularly in those strains that can cause extraintestinal disease...
July 17, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28715975/viruses-with-circular-single-stranded-dna-genomes-are-everywhere
#2
L M Shulman, I Davidson Davidson
Circular single-stranded DNA viruses infect archaea, bacteria, and eukaryotic organisms. The relatively recent emergence of single-stranded DNA viruses, such as chicken anemia virus (CAV) and porcine circovirus 2 (PCV2), as serious pathogens of eukaryotes is due more to growing awareness than to the appearance of new pathogens or alteration of existing pathogens. In the case of the ubiquitous human circular single-stranded DNA virus family Anelloviridae, there is still no convincing direct causal relation to any specific disease...
July 17, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28715974/electron-cryomicroscopy-of-viruses-at-near-atomic-resolutions
#3
Jason T Kaelber, Corey F Hryc, Wah Chiu
Recently, dozens of virus structures have been solved to resolutions between 2.5 and 5.0 Å by means of electron cryomicroscopy. With these structures we are now firmly within the "atomic age" of electron cryomicroscopy, as these studies can reveal atomic details of protein and nucleic acid topology and interactions between specific residues. This improvement in resolution has been the result of direct electron detectors and image processing advances. Although enforcing symmetry facilitates reaching near-atomic resolution with fewer particle images, it unfortunately obscures some biologically interesting components of a virus...
July 17, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28715973/the-molecular-basis-for-human-immunodeficiency-virus-latency
#4
Uri Mbonye, Jonathan Karn
Although potent combination antiretroviral therapy can effectively block viral replication in the host, human immunodeficiency virus (HIV) persists due to the existence of latent but replication-competent proviruses residing primarily in a very small population of resting memory CD4(+) T cells. Viral latency is established when the expression of the autoregulatory viral trans-activating factor Tat is reduced to subthreshold levels. The absence of Tat reduces HIV transcription and protein production to levels that make the host cell invisible to the immune system and refractory to antiretroviral treatment...
July 17, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28715972/defensins-in-viral-infection-and-pathogenesis
#5
Mayumi K Holly, Karina Diaz, Jason G Smith
α, β, and ω defensins are effectors of the innate immune system with potent antibacterial, antiviral, and antifungal activity. Defensins have direct antiviral activity in cell culture, with varied mechanisms for individual viruses, although some common themes have emerged. In addition, defensins have potent immunomodulatory activity that can alter innate and adaptive immune responses to viral infection. In some cases, there is evidence for paradoxical escape from defensin neutralization or enhancement of viral infection...
July 17, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28715971/a-consensus-view-of-escrt-mediated-human-immunodeficiency-virus-type-1-abscission
#6
J Lippincott-Schwartz, E O Freed, S B van Engelenburg
The strong dependence of retroviruses, such as human immunodeficiency virus type 1 (HIV-1), on host cell factors is no more apparent than when the endosomal sorting complex required for transport (ESCRT) machinery is purposely disengaged. The resulting potent inhibition of retrovirus release underscores the importance of understanding fundamental structure-function relationships at the ESCRT-HIV-1 interface. Recent studies utilizing advanced imaging technologies have helped clarify these relationships, overcoming hurdles to provide a range of potential models for ESCRT-mediated virus abscission...
July 17, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28701551/classic-spotlight-1996-and-1997-articles-of-significant-interest-selected-from-the-journal-of-virology-archives-by-the-editors
#7
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
August 1, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28700406/the-use-of-multistate-models-to-examine-associations-of-stress-and-adherence-with-transitions-among-hiv-care-states-observed-in-a-clinical-hiv-cohort
#8
Sandra Blitz, Tony Antoniou, Ann Burchell, Sharon Walmsley, Lucia Light, Sandra Gardner, Sean Rourke, Curtis Cooper, Claire Kendall, Mona Loutfy, Anita Rachlis, Wendy Wobeser, Anita Benoit, Janet Raboud
BACKGROUND: The "cascade of care" is a framework for quantifying the trajectory of people with HIV along the continuum of HIV care. We extended this framework to recognize that individuals may transition back and forth between states of care and to identify factors associated with movement among states of care over time, with particular focus on stress, depression and adherence. METHODS: The Ontario HIV Treatment Network Cohort Study is a multisite HIV clinical cohort...
July 3, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28691435/clinical-and-public-health-implications-of-acute-and-early-hiv-detection-and-treatment-a-scoping-review
#9
Sarah E Rutstein, Jintanat Ananworanich, Sarah Fidler, Cheryl Johnson, Eduard J Sanders, Omar Sued, Asier Saez-Cirion, Christopher D Pilcher, Christophe Fraser, Myron S Cohen, Marco Vitoria, Meg Doherty, Joseph D Tucker
INTRODUCTION: The unchanged global HIV incidence may be related to ignoring acute HIV infection (AHI). This scoping review examines diagnostic, clinical, and public health implications of identifying and treating persons with AHI. METHODS: We searched PubMed, in addition to hand-review of key journals identifying research pertaining to AHI detection and treatment. We focused on the relative contribution of AHI to transmission and the diagnostic, clinical, and public health implications...
June 28, 2017: Journal of the International AIDS Society
https://www.readbyqxmd.com/read/28654554/baseline-hepatitis-b-virus-titer-predicts-initial-postpartum-hepatic-flare-a-multicenter-prospective-study
#10
Jinfeng Liu, Jing Wang, Caijing Qi, Furong Cao, Zhen Tian, Dandan Guo, Taotao Yan, Qian Li, Shujuan Yang, JianJun Fu, Xianmei Tang, Xiaoni Kou, Na Liu, Zicheng Jiang, Yingren Zhao, Tianyan Chen
BACKGROUND AND GOALS: A series of changes in the immune system occur during pregnancy and puerperium. Currently, we aim to characterize both the natural changes in liver inflammation and its association with hepatitis B viremia during this special period. PATIENTS AND METHODS: Chronic hepatitis B (CHB) gravidas were recruited and followed up to 52 weeks postpartum. Virological and biochemical parameters were assessed throughout the period. RESULTS: A total of 1097 CHB mothers had finished the entire follow-up including 451 accepting telbivudine, 178 accepting tenofovir, and 468 without antiviral therapy...
June 26, 2017: Journal of Clinical Gastroenterology
https://www.readbyqxmd.com/read/28652477/classic-spotlight-1994-and-1995-articles-of-significant-interest-selected-from-the-journal-of-virology-archives-by-the-editors
#11
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
July 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28645240/engineered-expression-of-broadly-neutralizing-antibodies-against-human-immunodeficiency-virus
#12
Maham Ahmad, Osama M Ahmed, Bruce Schnepp, Philip R Johnson
This review discusses recent progress made in developing a vaccine and novel treatments for human immunodeficiency virus (HIV). It highlights the shortcomings of the RV144 vaccination trial [ALVAC-HIV (vCP1521) and AIDSVAX B/E] and the current standard of care and proposes that engineered expression of broadly neutralizing antibodies (bNAbs) against HIV-1 could overcome these shortcomings. Current developments in three major lines of research on HIV prevention and treatment using bNAbs are reviewed: firstly, the use of sequential immunogens to activate B cells to express bNAbs; secondly, the delivery of novel and extremely potent bNAbs through passive administration; and finally, the use of gene transfer using adeno-associated viral vectors to deliver bNAbs...
June 23, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28645239/cassava-mosaic-and-brown-streak-diseases-current-perspectives-and-beyond
#13
Chrissie Rey, Hervé Vanderschuren Vanderschuren
Cassava is the fourth largest source of calories in the world but is subject to economically important yield losses due to viral diseases, including cassava brown streak disease and cassava mosaic disease. Cassava mosaic disease occurs in sub-Saharan Africa and the Asian subcontinent and is associated with nine begomovirus species, whereas cassava brown streak disease has to date been reported only in sub-Saharan Africa and is caused by two distinct ipomovirus species. We present an overview of key milestones and their significance in the understanding and characterization of these two major diseases as well as their associated viruses and whitefly vector...
June 23, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28645238/new-world-arenavirus-biology
#14
Nicolás Sarute, Susan R Ross
Hemorrhagic fevers caused by viruses were identified in the late 1950s in South America. These viruses have existed in their hosts, the New World rodents, for millions of years. Their emergence as infectious agents in humans coincided with changes in the environment and farming practices that caused explosions in their host rodent populations. Zoonosis into humans likely occurs because the pathogenic New World arenaviruses use human transferrin receptor 1 to enter cells. The mortality rate after infection with these viruses is high, but the mechanism by which disease is induced is still not clear...
June 23, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28637388/progressive-multifocal-leukoencephalopathy-endemic-viruses-and-lethal-brain-disease
#15
Sheila A Haley, Walter J Atwood
In 1971, the first human polyomavirus was isolated from the brain of a patient who died from a rapidly progressing demyelinating disease known as progressive multifocal leukoencephalopathy. The virus was named JC virus after the initials of the patient. In that same year a second human polyomavirus was discovered in the urine of a kidney transplant patient and named BK virus. In the intervening years it became clear that both viruses were widespread in the human population but only rarely caused disease. The past decade has witnessed the discovery of eleven new human polyomaviruses, two of which cause unusual and rare cancers...
June 21, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28637387/immunopathology-of-chikungunya-virus-infection-lessons-learned-from-patients-and-animal-models
#16
Lisa F P Ng
Chikungunya virus (CHIKV) is an arthropod-borne alphavirus that causes acute and chronic arthritis. The virus reemerged in the Indian Ocean islands in 2005-2006 and is responsible for outbreaks in the Caribbean islands and the Americas since late 2013. Despite the wealth of research over the past 10 years, there are no commercially available antiviral drugs or vaccines. Treatment usually involves analgesics, anti-inflammatory drugs, and supportive care. Most studies have been focused on understanding the pathogenesis of CHIKV infection through clinical observation and with animal models...
June 21, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28637386/enzymes-and-enzyme-activity-encoded-by-nonenveloped-viruses
#17
Kimi Azad, Manidipa Banerjee, John E Johnson
Viruses are obligate intracellular parasites that rely on host cell machineries for their replication and survival. Although viruses tend to make optimal use of the host cell protein repertoire, they need to encode essential enzymatic or effector functions that may not be available or accessible in the host cellular milieu. The enzymes encoded by nonenveloped viruses-a group of viruses that lack any lipid coating or envelope-play vital roles in all the stages of the viral life cycle. This review summarizes the structural, biochemical, and mechanistic information available for several classes of enzymes and autocatalytic activity encoded by nonenveloped viruses...
June 21, 2017: Annual Review of Virology
https://www.readbyqxmd.com/read/28628529/appraising-viral-load-thresholds-and-adherence-support-recommendations-in-the-world-health-organization-guidelines-for-detection-and-management-of-virologic-failure
#18
Suzanne M McCluskey, Yap Boum, Nicholas Musinguzi, Jessica E Haberer, Jeffrey N Martin, Peter W Hunt, Vincent C Marconi, David R Bangsberg, Mark J Siedner
BACKGROUND: The World Health Organization defines HIV virologic failure as two consecutive viral loads >1,000 copies/mL, measured 3-6 months apart with interval adherence support. We sought to empirically evaluate these guidelines using data from an observational cohort. SETTING: The Uganda AIDS Rural Treatment Outcomes study observed adults with HIV in southwestern Uganda from the time of antiretroviral therapy (ART) initiation, and monitored adherence with electronic pill bottles...
June 15, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/28600469/classic-spotlight-1992-and-1993-articles-of-significant-interest-selected-from-the-journal-of-virology-archives-by-the-editors
#19
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
July 1, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28598903/self-reported-difficulties-with-everyday-function-cognitive-symptoms-and-cognitive-function-in-people-with-hiv
#20
Rosanna Laverick, Lewis Haddow, Marina Daskalopoulou, Fiona Lampe, Richard Gilson, Andrew Speakman, Andrea Antinori, Tina Bruun, Anna Vassilenko, Simon Collins, Alison Rodger
BACKGROUND: We determined factors associated with self-reported decline in activities of daily living (ADLs) and symptoms of cognitive impairment in HIV positive (HIV+) adults in five European clinics. METHODS: HIV+ adults underwent computerized and pen-and-paper neuropsychological tests and questionnaires of cognitive symptoms and ADLs. We considered cognitive function in five domains, psychosocial factors and clinical parameters as potentially associated with symptoms...
June 7, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
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