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https://www.readbyqxmd.com/read/28109007/retinoic-acid-inducible-gene-i-rig-i-like-receptors-rlrs-in-fish-current-knowledge-and-future-perspectives
#1
REVIEW
Shan Nan Chen, Peng Fei Zou, Pin Nie
Retinoic acid-inducible gene I (RIG-I)-like receptors (RLRs) are found conservatively present in teleost fish. All three members, RIG-I, MDA5 and LGP2 together with the downstream molecules such as MITA, TRAF3 and TBK1 have been identified in a range of fish species. However, it is a bit unexpected that RIG-I has not been reported in fish of Acanthopterygii, and it would be important to clarify the presence and role of RIG-I gene in a broad range of taxa in Teleostei. RLRs in fish can be induced in vivo and in vitro by viral pathogens as well as synthetic double-stranded RNA (dsRNA), poly(I:C), leading to the production of type I IFNs and the expression of IFN stimulated genes (ISGs)...
January 20, 2017: Immunology
https://www.readbyqxmd.com/read/28100675/protein-synthesis-inhibition-and-gadd34-control-ifn-%C3%AE-heterogeneous-expression-in-response-to%C3%A2-dsrna
#2
Alexandre Dalet, Rafael J Argüello, Alexis Combes, Lionel Spinelli, Sebastien Jaeger, Mathieu Fallet, Thien-Phong Vu Manh, Andreia Mendes, Jessica Perego, Marisa Reverendo, Voahirana Camosseto, Marc Dalod, Tobias Weil, Manuel A Santos, Evelina Gatti, Philippe Pierre
In innate immune responses, induction of type-I interferons (IFNs) prevents virus spreading while viral replication is delayed by protein synthesis inhibition. We asked how cells perform these apparently contradictory activities. Using single fibroblast monitoring by flow cytometry and mathematical modeling, we demonstrate that type-I IFN production is linked to cell's ability to enter dsRNA-activated PKR-dependent translational arrest and then overcome this inhibition by decreasing eIF2α phosphorylation through phosphatase 1c cofactor GADD34 (Ppp1r15a) expression...
January 18, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28096399/antiviral-screening-identifies-adenosine-analogs-targeting-the-endogenous-dsrna-leishmania-rna-virus-1-lrv1-pathogenicity-factor
#3
F Matthew Kuhlmann, John I Robinson, Gregory R Bluemling, Catherine Ronet, Nicolas Fasel, Stephen M Beverley
The endogenous double-stranded RNA (dsRNA) virus Leishmaniavirus (LRV1) has been implicated as a pathogenicity factor for leishmaniasis in rodent models and human disease, and associated with drug-treatment failures in Leishmania braziliensis and Leishmania guyanensis infections. Thus, methods targeting LRV1 could have therapeutic benefit. Here we screened a panel of antivirals for parasite and LRV1 inhibition, focusing on nucleoside analogs to capitalize on the highly active salvage pathways of Leishmania, which are purine auxotrophs...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28093313/knockdown-of-nuclease-activity-in-the-gut-enhances-rnai-efficiency-in-the-colorado-potato-beetle-leptinotarsa-decemlineata-but-not-in-the-desert-locust-schistocerca-gregaria
#4
Jornt Spit, Annelies Philips, Niels Wynant, Dulce Santos, Geert Plaetinck, Jozef Vanden Broeck
The responsiveness towards orally delivered dsRNA and the potency of a subsequent environmental RNA interference (RNAi) response strongly differs between different insect species. While some species are very sensitive to dsRNA delivery through the diet, others are not. The underlying reasons for this may vary, but degradation of dsRNA by nucleases in the gut lumen is believed to play a crucial role. The Colorado potato beetle, Leptinotarsa decemlineata, is a voracious defoliator of potato crops worldwide, and is currently under investigation for novel control methods based on dsRNA treatments...
January 13, 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28088361/purification-and-characterisation-of-dsrna-using-ion-pair-reverse-phase-chromatography-and-mass-spectrometry
#5
Alison O Nwokeoji, An-Wen Kung, Peter M Kilby, David E Portwood, Mark J Dickman
RNA interference has provided valuable insight into a wide range of biological systems and is a powerful tool for the analysis of gene function. The exploitation of this pathway to block the expression of specific gene targets holds considerable promise for the development of novel RNAi-based insect management strategies. In addition, there are a wide number of future potential applications of RNAi to control agricultural insect pests as well as its use for prevention of diseases in beneficial insects. The potential to synthesise large quantities of dsRNA by in-vitro transcription or in bacterial systems for RNA interference applications has generated significant demand for the development and application of high throughput analytical tools for the rapid extraction, purification and analysis of dsRNA...
December 21, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28086865/rnai-reveals-proteins-for-metabolism-and-protein-processing-associated-with-langat-virus-infection-in-ixodes-scapularis-black-legged-tick-ise6-cells
#6
Jeffrey M Grabowski, Monika Gulia-Nuss, Richard J Kuhn, Catherine A Hill
BACKGROUND: Tick-borne flaviviruses (TBFs) cause thousands of human cases of encephalitis worldwide each year, with some TBF infections progressing to hemorrhagic fever. TBFs are of medical and veterinary importance and strategies to reduce flavivirus transmission by the tick vector may have significant application. Analyses of the proteome of ISE6 cells derived from the black legged tick, Ixodes scapularis infected with the TBF, Langat virus (LGTV), have provided insights into proteins and cellular processes involved with LGTV infection...
January 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28077640/viral-rna-at-two-stages-of-reovirus-infection-is-required-for-the-induction-of-necroptosis
#7
Angela K Berger, Bradley E Hiller, Deepti Thete, Anthony J Snyder, Encarnacion Perez, Jason W Upton, Pranav Danthi
: Necroptosis, a regulated form of necrotic cell death requires the activation of the RIP3 kinase. Here, we identify that infection of host cells with reovirus can result in necroptosis. We find that necroptosis requires sensing of the genomic RNA within incoming virus particles via cytoplasmic RNA sensors to produce type I IFN. While these events that occur prior to de novo synthesis of viral RNA are required for induction of necroptosis, they are not sufficient. Induction of necroptosis also requires late stages of reovirus infection...
January 11, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28077637/role-of-litopenaeus-vannamei-yin-yang-1-in-the-regulation-of-the-white-spot-syndrome-virus-immediate-early-gene-ie1
#8
Ping-Han Huang, Ting-Yi Huang, Pei-Si Cai, Li-Kwan Chang
: Yin Yang 1 (YY1) is a multifunctional zinc-finger transcription factor that regulates many key cellular processes. In this study, we report the cloning of YY1 from shrimp, Litopenaeus vannamei, (LvYY1). The study shows that LvYY1 is ubiquitously expressed in shrimp tissues, and knockdown of LvYY1 expression by dsRNA injection in WSSV-infected shrimp reduced both mRNA levels of the WSSV immediate-early gene, ie1, as well as overall copy numbers of the WSSV genome. The cumulative mortality of infected shrimp also declined with LvYY1 dsRNA injection...
January 11, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28069892/post-translational-regulation-of-the-dicing-activities-of-arabidopsis-dicer-like-3-and-4-by-inorganic-phosphate-and-the-redox-state
#9
Atsushi Seta, Midori Tabara, Yuki Nishibori, Akihiro Hiraguri, Naoko Ohkama-Ohtsu, Tadashi Yokoyama, Satoshi Hara, Keisuke Yoshida, Toru Hisabori, Akihito Fukudome, Hisashi Koiwa, Hiromitsu Moriyama, Nobuhiro Takahashi, Toshiyuki Fukuhara
In Arabidopsis thaliana, small interfering RNAs (siRNAs) generated by two Dicer isoforms, DCL3 and DCL4, function in distinct epigenetic processes, i.e. RNA-directed DNA methylation and post-transcriptional gene silencing, respectively. Plants often respond to their environment by producing a distinct set of small RNAs; however, the mechanism for controlling the production of different siRNAs from the same dsRNA substrate remains unclear. We established a simple biochemical method to visualize the dsRNA-cleaving activities of DCL3 and DCL4 in cell-free extracts prepared from Arabidopsis seedlings...
January 9, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28069888/human-non-coding-rna-886-nc886-adopts-two-structurally-distinct-conformers-that-are-functionally-opposing-regulators-of-pkr
#10
Brenda M Calderon, Graeme L Conn
The double-stranded RNA (dsRNA)-activated protein kinase (PKR) senses dsRNA produced during viral infection and halts cellular protein synthesis to block viral replication. How basal PKR activity is controlled in the absence of infection was unclear until the recent identification of a potential endogenous regulator, the cellular non-coding RNA 886 (nc886). However, nc886 adopts two distinct conformations for which the structural details and potential functional differences remain unclear. Here, we isolated and separately dissected the function of form of nc886 to more clearly define the molecular mechanism of nc886-mediated PKR inhibition...
January 9, 2017: RNA
https://www.readbyqxmd.com/read/28067898/clay-nanosheets-for-topical-delivery-of-rnai-for-sustained-protection-against-plant-viruses
#11
Neena Mitter, Elizabeth A Worrall, Karl E Robinson, Peng Li, Ritesh G Jain, Christelle Taochy, Stephen J Fletcher, Bernard J Carroll, G Q Max Lu, Zhi Ping Xu
Topical application of pathogen-specific double-stranded RNA (dsRNA) for virus resistance in plants represents an attractive alternative to transgenic RNA interference (RNAi). However, the instability of naked dsRNA sprayed on plants has been a major challenge towards its practical application. We demonstrate that dsRNA can be loaded on designer, non-toxic, degradable, layered double hydroxide (LDH) clay nanosheets. Once loaded on LDH, the dsRNA does not wash off, shows sustained release and can be detected on sprayed leaves even 30 days after application...
January 9, 2017: Nature Plants
https://www.readbyqxmd.com/read/28063952/transcriptome-profiling-of-spleen-provides-insights-into-the-antiviral-mechanism-in-schizothorax-prenanti-after-poly-i-c-challenge
#12
Xiaogang Du, Yunkun Li, Dong Li, Fangliang Lian, Shiyong Yang, Jiayun Wu, Hanmei Liu, Guixian Bu, Fengyan Meng, Xiaohan Cao, Xianyin Zeng, Huaiyu Zhang, Zhiyu Chen
Schizothorax prenanti (S. prenanti) is an important economical cold-water fish species in southwestern China, but it is susceptible to various pathogens infection. In order to clearly elucidate the antiviral mechanism, in this study, we have analyzed the transcriptome of S. prenanti spleen after challenge with the virus mimic, poly (I:C) (pIC), using next generation sequencing technology (RNA-seq). A total of 313 differential expressed genes (DEGs) in spleen at 12 h were obtained after pIC treatment, including 268 significantly up-regulated unigenes (fold change > 2) and 45 significantly down-regulated unigenes (fold change > 2)...
January 4, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28061446/%C3%AE-40p53-is-involved-in-the-inactivation-of-autophagy-and-contributes-to-inhibition-of-cell-death-in-hct116-%C3%AE-40p53-cells
#13
Yunjin Zang, Ying Shi, Kai Liu, Luxin Qiao, Xianghua Guo, Dexi Chen
Δ40p53 is an isoform of wild-type p53 (wtp53). Here, we assessed whether Δ40p53 has the same functions as wild-type p53 in the regulation of cell death and autophagy. First, we used HCT116 (p53+/+) and H1299 (p53-free) cells to produce two cell lines (HCT116-Δ40p53 and H1299-Δ40p53) that express exogenous Δ40p53 but not wtp53. By using these cell lines, we determined that Δ40p53 inhibited starvation-induced autophagy, as does wtp53. This inhibition arises from both Δ40p53 and wtp53 having 3'-5' exonuclease activity, which reduces the levels of double-stranded RNA (dsRNA) and then inhibits PKR/eIF2α-induced autophagy in cells exposed to starvation...
January 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28060922/cry3bb1-resistant-western-corn-rootworm-diabrotica-virgifera-virgifera-leconte-does-not-exhibit-cross-resistance-to-dvsnf7-dsrna
#14
William Moar, Chitvan Khajuria, Michael Pleau, Oliver Ilagan, Mao Chen, Changjian Jiang, Paula Price, Brian McNulty, Thomas Clark, Graham Head
BACKGROUND AND METHODOLOGY: There is a continuing need to express new insect control compounds in transgenic maize against western corn rootworm, Diabrotica virgifera virgifera (LeConte) (WCR). In this study three experiments were conducted to determine cross-resistance between the new insecticidal DvSnf7 dsRNA, and Bacillus thuringiensis (Bt) Cry3Bb1; used to control WCR since 2003, with field-evolved resistance being reported. Laboratory susceptible and Cry3Bb1-resistant WCR were evaluated against DvSnf7 dsRNA in larval diet-incorporation bioassays...
2017: PloS One
https://www.readbyqxmd.com/read/28060304/rearing-and-double-stranded-rna-mediated-gene-knockdown-in-the-hide-beetle-dermestes-maculatus
#15
Jie Xiang, Katie Reding, Leslie Pick
Advances in genomics have raised the possibility of probing biodiversity at an unprecedented scale. However, sequence alone will not be informative without tools to study gene function. The development and sharing of detailed protocols for the establishment of new model systems in laboratories, and for tools to carry out functional studies, is thus crucial for leveraging the power of genomics. Coleoptera (beetles) are the largest clade of insects and occupy virtually all types of habitats on the planet. In addition to providing ideal models for fundamental research, studies of beetles can have impacts on pest control as they are often pests of households, agriculture, and food industries...
December 28, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28058810/prediction-of-effective-rna-interference-targets-and-pathway-related-genes-in-lepidopteran-insects-by-rna-sequencing-analysis
#16
Ruo-Bing Guan, Hai-Chao Li, Xue-Xia Miao
When using RNAi to study gene functions in Lepidoptera insects, we discovered that some genes could not be suppressed, instead, their expression levels could be up-regulated by dsRNA. To predict which genes could be easily silenced, we treated the Asian corn borer (Ostrinia furnacalis) with dsGFP and dsMLP. A transcriptome sequence analysis was conducted using the cDNAs 6 h after treatment with dsRNA. The results indicated that 160 genes were up-regulated and 44 genes were down-regulated by the two dsRNAs. Then, 50 co-up-regulated, 25 co-down-regulated and 43 unaffected genes were selected to determine their RNAi responses...
January 6, 2017: Insect Science
https://www.readbyqxmd.com/read/28056414/clathrin-mediated-endocytosis-is-involved-in-tomato-yellow-leaf-curl-virus-transport-across-the-midgut-barrier-of-its-whitefly-vector
#17
Li-Long Pan, Qun-Fang Chen, Juan-Juan Zhao, Tao Guo, Xiao-Wei Wang, Aliza Hariton-Shalev, Henryk Czosnek, Shu-Sheng Liu
Tomato yellow leaf curl virus (TYLCV) is a begomovirus transmitted by the whitefly Bemisia tabaci. The circulative translocation of the virus in the insect is known in its broad line. However, transit of TYLCV from the digestive tract into the haemolymph is poorly understood. We studied the involvement of clathrin in this process by disrupting the clathrin-mediated endocytosis and the endosome network using inhibitor feeding, antibody blocking and dsRNA silencing. We monitored the quantities of TYLCV in the whitefly and virus transmission efficiency...
January 2, 2017: Virology
https://www.readbyqxmd.com/read/28054949/using-vital-dyes-to-trace-uptake-of-dsrna-by-green-peach-aphid-allows-effective-assessment-of-target-gene-knockdown
#18
Vineeta Bilgi, John Fosu-Nyarko, Michael G K Jones
RNA interference (RNAi) is an effective tool to study gene function. For in vitro studies of RNAi in insects, microinjection of double-stranded (ds)RNA may cause stress. Non-persuasive oral delivery of dsRNA to trigger RNAi is a better mode of delivery for delicate insects such as aphids because it mimics natural feeding. However, when insects feed ad libitum, some individuals may not feed. For accurate measurement of gene knockdown, analysis should only include insects that have ingested dsRNA. The suitability of eleven dyes was assessed to trace ingestion of dsRNA in an artificial feeding system for green peach aphids (GPA, Myzus persicae)...
January 3, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28052863/double-stranded-rna-up-regulates-the-expression-of-inflammatory-mediators-in-human-aortic-valve-cells-through-the-tlr3-trif-non-canonical-nf-%C3%AE%C2%BAb-pathway
#19
Qiong Zhan, Rui Song, Fei Li, Lihua Ao, Qingchun Zeng, Dingli Xu, David A Fullerton, Xianzhong Meng
BACKGROUND: Calcific aortic valve disease (CAVD) is a chronic inflammatory condition and the inflammatory responses of aortic valve interstitial cells (AVICs) play a critical role in the disease progression. Double-stranded RNA (dsRNA) released from damaged or stressed cells is pro-inflammatory and may contribute to the mechanism of chronic inflammation observed in diseased aortic valves. The objective of this study is to determine the effect of dsRNA on AVIC inflammatory responses and the underlying mechanism...
January 4, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28050736/characterization-of-a-novel-dsrna-mycovirus-of-trichoderma-atroviride-nfcf028
#20
Song Hee Lee, Suk-Hyun Yun, Jeesun Chun, Dae-Hyuk Kim
Molecular characterization of the most common dsRNA element from Trichoderma atroviride indicated that it comprised 8,566 bp and encoded two large open reading frames (ORF1 and 2). The two ORFs were found to overlap by 46 bp with a typical (-1) slippery heptanucelotide sequence. The deduced protein sequences of ORF1 and ORF2 showed significant similarities to those of known mycoviral structural proteins and RNA-dependent RNA polymerases, respectively. Phylogenetic analysis indicated that this dsRNA is a member of a distinct species related to a group of unclassified mycoviruses; therefore, it was named Trichoderma atroviride mycovirus 1 (TaMV1)...
January 3, 2017: Archives of Virology
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