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Keywords = nonretroviral integrated RNA viruses (NIRVs)

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13 pages, 4183 KB  
Communication
Metagenomic Snapshots of Viral Components in Guinean Bats
by Roberto J. Hermida Lorenzo, Dániel Cadar, Fara Raymond Koundouno, Javier Juste, Alexandra Bialonski, Heike Baum, Juan Luis García-Mudarra, Henry Hakamaki, András Bencsik, Emily V. Nelson, Miles W. Carroll, N’Faly Magassouba, Stephan Günther, Jonas Schmidt-Chanasit, César Muñoz Fontela and Beatriz Escudero-Pérez
Microorganisms 2021, 9(3), 599; https://doi.org/10.3390/microorganisms9030599 - 15 Mar 2021
Cited by 13 | Viewed by 5109
Abstract
To prevent the emergence of zoonotic infectious diseases and reduce their epidemic potential, we need to understand their origins in nature. Bats in the order Chiroptera are widely distributed worldwide and are natural reservoirs of prominent zoonotic viruses, including Nipah virus, Marburg virus, [...] Read more.
To prevent the emergence of zoonotic infectious diseases and reduce their epidemic potential, we need to understand their origins in nature. Bats in the order Chiroptera are widely distributed worldwide and are natural reservoirs of prominent zoonotic viruses, including Nipah virus, Marburg virus, and possibly SARS-CoV-2. In this study, we applied unbiased metagenomic and metatranscriptomic approaches to decipher the virosphere of frugivorous and insectivorous bat species captured in Guéckédou, Guinea, the epicenter of the West African Ebola virus disease epidemic in 2013–2016. Our study provides a snapshot of the viral diversity present in these bat species, with several novel viruses reported for the first time in bats, as well as some bat viruses closely related to known human or animal pathogens. In addition, analysis of Mops condylurus genomic DNA samples revealed the presence of an Ebola virus nucleoprotein (NP)-derived pseudogene inserted in its genome. These findings provide insight into the evolutionary traits of several virus families in bats and add evidence that nonretroviral integrated RNA viruses (NIRVs) derived from filoviruses may be common in bat genomes. Full article
(This article belongs to the Special Issue Bats in Infectiology Research—Novel Tools and New Findings)
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17 pages, 386 KB  
Review
The Widespread Occurrence and Potential Biological Roles of Endogenous Viral Elements in Insect Genomes
by Carol D. Blair, Ken E. Olson and Mariangela Bonizzoni
Curr. Issues Mol. Biol. 2019, 34(1), 13-30; https://doi.org/10.21775/cimb.034.013 - 6 Jun 2019
Cited by 43 | Viewed by 1914
Abstract
Modern genomic sequencing and bioinformatics approaches have detected numerous examples of DNA sequences derived from DNA and RNA virus genomes integrated into both vertebrate and insect genomes. Retroviruses encode RNA-dependent DNA polymerases (reverse transcriptases) and integrases that convert their RNA viral genomes into [...] Read more.
Modern genomic sequencing and bioinformatics approaches have detected numerous examples of DNA sequences derived from DNA and RNA virus genomes integrated into both vertebrate and insect genomes. Retroviruses encode RNA-dependent DNA polymerases (reverse transcriptases) and integrases that convert their RNA viral genomes into DNA proviruses and facilitate proviral DNA integration into the host genome. Surprisingly, DNA sequences derived from RNA viruses that do not encode these enzymes also occur in host genomes. Non-retroviral integrated RNA virus sequences (NIRVS) occur at relatively high frequency in the genomes of the arboviral vectors Aedes aegypti and Aedes albopictus, are not distributed randomly and possibly contribute to mosquito antiviral immunity, suggesting these mosquitoes could serve as a model system for unravelling the function of NIRVS. Here we address the following questions: What drives DNA synthesis from the genomes of non-retroviral RNA viruses? How does integration of virus cDNA into host DNA occur, and what is its biological function (if any)? We review current knowledge of viral integrations in insect genomes, hypothesize mechanisms of NIRVS formation and their potential impact on insect biology, particularly antiviral immunity, and suggest directions for future research. Full article
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