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Rna interference

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https://www.readbyqxmd.com/read/28822598/next-generation-insect-resistant-plants-rnai-mediated-crop-protection
#1
REVIEW
Jiang Zhang, Sher Afzal Khan, David G Heckel, Ralph Bock
Plant-mediated RNA interference (RNAi) shows great potential in crop protection. It relies on plants stably expressing double-stranded RNAs (dsRNAs) that target essential genes in pest insects. Practical application of this strategy is challenging because producing sufficient amounts of stable dsRNA in plants has proven to be difficult to achieve with conventional transgenesis. In addition, many insects do not respond to exogenously applied dsRNAs, either degrading them or failing to import them into the cytoplasm...
May 20, 2017: Trends in Biotechnology
https://www.readbyqxmd.com/read/28822479/next-generation-insect-resistant-plants-rnai-mediated-crop-protection
#2
REVIEW
Jiang Zhang, Sher Afzal Khan, David G Heckel, Ralph Bock
Plant-mediated RNA interference (RNAi) shows great potential in crop protection. It relies on plants stably expressing double-stranded RNAs (dsRNAs) that target essential genes in pest insects. Practical application of this strategy is challenging because producing sufficient amounts of stable dsRNA in plants has proven to be difficult to achieve with conventional transgenesis. In addition, many insects do not respond to exogenously applied dsRNAs, either degrading them or failing to import them into the cytoplasm...
September 2017: Trends in Biotechnology
https://www.readbyqxmd.com/read/28821760/a-database-of-breast-oncogenic-specific-sirnas
#3
Atul Tyagi, Manoj Semwal, Ashok Sharma
Breast cancer is a serious problem causing the death of women across the world. At present, one of the major challenges is to design drugs to target breast cancer specific gene(s). RNA interference (RNAi) is an important technique for targeted gene silencing that may lead to promising novel therapeutic strategies for breast cancer. Therefore, identification of such molecules having high oncogene specificity is the need of the hour. Here, we have developed a database named as Breast Oncogenic Specific siRNAs (BOSS, http://bioinformatics...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821455/rnase-hii-saves-rnha-mutant-escherichia-coli-from-r-loop-associated-chromosomal-fragmentation
#4
Elena A Kouzminova, Farid F Kadyrov, Andrei Kuzminov
The rnhAB mutant E. coli, deficient in two RNase H enzymes that remove both R-loops and incorporated ribonucleotides (rNs) from DNA, grow slowly, suggesting accumulation of rN-containing DNA lesions (R-lesions). We report that the rnhAB mutants have reduced viability, form filaments with abnormal nucleoids, induce SOS and fragment their chromosome, revealing replication and/or segregation stress. R-loops are known to interfere with replication forks, and sensitivity of the double rnhAB mutants to translation inhibition points to R-loops as precursors for R-lesions...
August 15, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28819251/g9a-regulates-breast-cancer-growth-by-modulating-iron-homeostasis-through-the-repression-of-ferroxidase-hephaestin
#5
Ya-Fang Wang, Jie Zhang, Yi Su, Yan-Yan Shen, Dong-Xian Jiang, Ying-Yong Hou, Mei-Yu Geng, Jian Ding, Yi Chen
G9a, a H3K9 methyltransferase, shows elevated expression in many types of human cancers, particularly breast cancer. However, the tumorigenic mechanism of G9a is still far from clear. Here we report that G9a exerts its oncogenic function in breast cancer by repressing hephaestin and destruction cellular iron homeostasis. In the case of pharmacological inhibition or short hairpin RNA interference-mediated suppression of G9a, the expression and activity of hephaestin increases, leading to the observed decrease of intracellular labile iron content and the disturbance of breast cancer cell growth in vitro and in vivo...
August 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28818370/overexpression-of-vpeifp1-a-novel-f-box-kelch-repeat-protein-from-wild-chinese-vitis-pseudoreticulata-confers-higher-tolerance-to-powdery-mildew-by-inducing-thioredoxin-z-proteolysis
#6
Jie Wang, Wenkong Yao, Lei Wang, Fuli Ma, Weihuo Tong, Chen Wang, Rui Bao, Changyue Jiang, Yazhou Yang, Jianxia Zhang, Yan Xu, Xiping Wang, Chaohong Zhang, Yuejin Wang
An F-box protein (VpEIFP1) induced by Erysiphe necator was isolated from Vitis pseudoreticulata, a wild Chinese grapevine species naturally resistant to powdery mildew (PM). It contains an F-box domain and two Kelch-repeat motifs. Expression profiles indicate the VpEIFP1 is strongly induced at both transcriptional and translational levels by PM infection. A subcellular localisation assay showed that VpEIFP1 is predominantly located in the nucleus and cytoplasm. Overexpression of VpEIFP1 accelerated the accumulation of hydrogen peroxide (H2O2) and up-regulated the expressions of ICS2, NPR1 and PR1 involved in defence responses, resulting in suppression of PM germination and growth...
October 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28817787/evaluation-of-the-electron-transfer-flavoprotein-etf-as-an-antibacterial-target-in-burkholderia-cenocepacia
#7
Maria S Stietz, Christina Lopez, Osasumwen Osifo, Marcelo Tolmasky, Silvia T Cardona
There are hundreds of essential genes in multidrug resistant bacterial genomes, but only a few of their products are exploited as antibacterial targets. An example is the electron flavoprotein (ETF) which is required for growth and viability in <i>Burkholderia cenocepacia</i>. Here, we evaluated ETF as an antibiotic target for <i>Burkholderia cepacia</i> complex (Bcc). Depletion of the bacterial ETF during infection of <i>Caenorhabditis elegans</i> significantly extended survival of the nematodes, proving that ETF is essential for survival of <i>B...
August 17, 2017: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28817179/autophagy-induction-plays-a-protective-role-against-hypoxic-stress-in-human-dental-pulp-cells
#8
Sam-Young Park, Eun-Gene Sun, Yeonju Lee, Min-Seok Kim, Jae Hyung Kim, Won-Jae Kim, Ji-Yeon Jung
Human dental pulp exposed to hypoxic conditions induces cell death accompanied by autophagy. However, the role of hypoxia-induced autophagy in human dental pulp cells (HDPCs) is unclear. The present study aimed to investigate the role of autophagy in hypoxia-induced apoptosis of HDPCs. Cobalt chloride (CoCl2 ) treated HDPCs, to mimic hypoxic conditions, decreased cell viability. Also, apoptosis-related signal molecules, cleaved caspase-3 and PARP levels, were enhanced in CoCl2 -treated HDPCs. HDPCs exposed to CoCl2 also promoted autophagy, showing upregulated p62 and microtubule-associated protein 1 light chain 3 (LC3)-II levels, typical autophagic markers, and increased acidic autophagolysosomal vacuoles...
August 17, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28816598/short-versus-long-double-stranded-rna-activation-of-a-post-transcriptional-gene-knockdown-pathway
#9
Nir Shpak, Rivka Manor, Lihie Katzir Abilevich, Ortal Mantal, Keshet Shavit, Eliahu D Aflalo, Debra Toiber, Amir Sagi
RNA interference (RNAi) utilizes a conserved cellular autoimmune defense mechanism involving the internalization of dsRNA into cells and the activation of a set of RNAi related genes. Using RNAi, complete sex reversal is achievable in males of the prawn Macrobrachium rosenbergii by knocking down the transcript level of an insulin-like androgenic gland hormone (Mr-IAG) through injections of dsRNA of the entire Mr-IAG ORF sequence (dsMr-IAG - 518 bp). Interestingly, in-vivo knockdown success and dsMr-IAG lengths seemed to correlate, with long dsRNA being the most effective and short dsRNA fragments showing no effect...
August 17, 2017: RNA Biology
https://www.readbyqxmd.com/read/28815217/deletion-of-cytoplasmic-double-stranded-rna-sensors-does-not-uncover-viral-small-interfering-rna-production-in-human-cells
#10
Susan Schuster, Lotte E Tholen, Gijs J Overheul, Frank J M van Kuppeveld, Ronald P van Rij
Antiviral immunity in insects and plants is mediated by the RNA interference (RNAi) pathway in which viral long double-stranded RNA (dsRNA) is processed into small interfering RNAs (siRNAs) by Dicer enzymes. Although this pathway is evolutionarily conserved, its involvement in antiviral defense in mammals is the subject of debate. In vertebrates, recognition of viral RNA induces a sophisticated type I interferon (IFN)-based immune response, and it has been proposed that this response masks or inhibits antiviral RNAi...
July 2017: MSphere
https://www.readbyqxmd.com/read/28815213/identification-of-rab18-as-an-essential-host-factor-for-bk-polyomavirus-infection-using-a-whole-genome-rna-interference-screen
#11
Linbo Zhao, Michael J Imperiale
BK polyomavirus (BKPyV) is a human pathogen first isolated in 1971. BKPyV infection is ubiquitous in the human population, with over 80% of adults worldwide being seropositive for BKPyV. BKPyV infection is usually asymptomatic; however, BKPyV reactivation in immunosuppressed transplant patients causes two diseases, polyomavirus-associated nephropathy and hemorrhagic cystitis. To establish a successful infection in host cells, BKPyV must travel in retrograde transport vesicles to reach the nucleus. To make this happen, BKPyV requires the cooperation of host cell proteins...
July 2017: MSphere
https://www.readbyqxmd.com/read/28813645/lat-is-essential-for-the-mast-cell-stabilising-effect-of-thga-in-ige-mediated-mast-cell-activation
#12
Ji Wei Tan, Daud Ahmad Israf, Nur Fariesha Md Hashim, Yoke Kqueen Cheah, Hanis Hazeera Harith, Khozirah Shaari, Chau Ling Tham
Mast cells play a central role in the pathogenesis of allergic reaction. Activation of mast cells by antigens is strictly dependent on the influx of extracellular calcium that involves a complex interaction between signalling molecules located within the cells. We have previously reported that tHGA, an active compound originally isolated from a local shrub known as Melicope ptelefolia, prevented IgE-mediated mast cell activation and passive systemic anaphylaxis by suppressing the release of interleukin-4 (IL-4) and tumour necrosis factor (TNF)-α from activated rat basophilic leukaemia (RBL)-2H3 cells...
August 13, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28811374/recruitment-of-crispr-cas-systems-by-tn7-like-transposons
#13
Joseph E Peters, Kira S Makarova, Sergey Shmakov, Eugene V Koonin
A survey of bacterial and archaeal genomes shows that many Tn7-like transposons contain minimal type I-F CRISPR-Cas systems that consist of fused cas8f and cas5f, cas7f, and cas6f genes and a short CRISPR array. Several small groups of Tn7-like transposons encompass similarly truncated type I-B CRISPR-Cas. This minimal gene complement of the transposon-associated CRISPR-Cas systems implies that they are competent for pre-CRISPR RNA (precrRNA) processing yielding mature crRNAs and target binding but not target cleavage that is required for interference...
August 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28810585/glutamine-promotes-hsp70-and-inhibits-%C3%AE-synuclein-accumulation-in-pheochromocytoma-pc12-cells
#14
Haiyang Wang, Chongyang Tang, Zhenfeng Jiang, Xiao Zhou, Jianhang Chen, Meng Na, Hong Shen, Zhiguo Lin
Hsp70 regulates α-Synuclein (α-Syn) degeneration in Parkinson's disease (PD), indicating that Hsp70 promotion may be able to prevent or reverse α-Syn-induced toxicity in PD. Additionally, it has been demonstrated that glutamine (Gln) enhances Hsp70 expression. In the present study, Gln-induced Hsp70 promotion in pheochromocytoma was investigated with reverse transcription- quantitative polymerase chain reaction and western blotting methods. Then it was observed whether heat shock factor (HSF)-1 was required for this phenomenon with an RNA interference strategy...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28810331/-effect-of-tsc2-gene-expression-downregulation-by-lentivirus-induced-rna-interference-on-u937-cell-line-and-its-mechanism
#15
Z F Xu, H X Liu, Y H Tan, X H Chen, F G Ren, Y F Zhang, J M Chang, N Zhang, J J Hu, H W Wang
Objective: To investigate the effect of biology and mTOR pathway activity of down-regulated TSC2 gene expression on U937 leukemia cells. Methods: Gene expression was down-regulated by lentivirus induced RNA interference on TSC2 high expressed U937 cell line; the proliferation, apoptosis and differentiation were detected by CCK-8 assay, colony formation assay and flow cytometry; the gene expression level and protein kinase activity were detected by qRT-PCR and Western blot. Results: Down-regulated expression of TSC2 gene promoted U937 cell proliferation and colony formation ability (P<0...
July 14, 2017: Zhonghua Xue Ye Xue za Zhi, Zhonghua Xueyexue Zazhi
https://www.readbyqxmd.com/read/28809941/analysis-of-agoshrna-maturation-and-loading-into-ago2
#16
Alex Harwig, Zita Kruize, Zhenhuang Yang, Tobias Restle, Ben Berkhout
The RNA interference (RNAi) pathway was recently expanded by the discovery of multiple alternative pathways for processing of natural microRNA (miRNA) and man-made short hairpin RNA (shRNA) molecules. One non-canonical pathway bypasses Dicer cleavage and requires instead processing by Argonaute2 (Ago2), which also executes the subsequent silencing step. We named these molecules AgoshRNA, which generate only a single active RNA strand and thus avoid off-target effects that can be induced by the passenger strand of a regular shRNA...
2017: PloS One
https://www.readbyqxmd.com/read/28809012/comparative-genomics-as-a-foundation-for-evo-devo-studies-in-birds
#17
Phil Grayson, Simon Y W Sin, Timothy B Sackton, Scott V Edwards
Developmental genomics is a rapidly growing field, and high-quality genomes are a useful foundation for comparative developmental studies. A high-quality genome forms an essential reference onto which the data from numerous assays and experiments, including ChIP-seq, ATAC-seq, and RNA-seq, can be mapped. A genome also streamlines and simplifies the development of primers used to amplify putative regulatory regions for enhancer screens, cDNA probes for in situ hybridization, microRNAs (miRNAs) or short hairpin RNAs (shRNA) for RNA interference (RNAi) knockdowns, mRNAs for misexpression studies, and even guide RNAs (gRNAs) for CRISPR knockouts...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28808133/the-rph-1-encoded-truncated-rnase-ph-protein-inhibits-rnase-p-maturation-of-pre-trnas-with-short-leader-sequences-in-the-absence-of-rpph
#18
Katherine E Bowden, Nicholas S Wiese, Tariq Perwez, Bijoy K Mohanty, Sidney R Kushner
RNase PH, encoded by the rph gene, is a 3' → 5' exoribonuclease that in E. coli participates primarily in the 3' maturation of pre-tRNAs and the degradation of ribosomal RNA (rRNA) in stationary phase cells. Interestingly, the routinely used laboratory strains of MG1655 and W3110 have naturally acquired the rph-1 allele encoding a truncated, catalytically inactive RNase PH protein, which is widely assumed to be benign. Contrary to this assumption, we show that rph-1 encoded Rph-1 protein inhibits RNase P mediated 5' end maturation of primary pre-tRNAs with leaders < 5 nucleotides in the absence of RppH, an RNA pyrophosphohydrolase...
August 14, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28808113/lncrna-gas5-inhibits-microglial-m2-polarization-and-exacerbates-demyelination
#19
Dingya Sun, Zhongwang Yu, Xue Fang, Mingdong Liu, Yingyan Pu, Qi Shao, Dan Wang, Xiaolin Zhao, Aijun Huang, Zhenghua Xiang, Chao Zhao, Robin Jm Franklin, Li Cao, Cheng He
The regulation of inflammation is pivotal for preventing the development or reoccurrence of multiple sclerosis (MS). A biased ratio of high-M1 versus low-M2 polarized microglia is a major pathological feature of MS Here, using microarray screening, we identify the long noncoding RNA (lncRNA) GAS5 as an epigenetic regulator of microglial polarization. Gain- and loss-of-function studies reveal that GAS5 suppresses microglial M2 polarization. Interference with GAS5 in transplanted microglia attenuates the progression of experimental autoimmune encephalomyelitis (EAE) and promotes remyelination in a lysolecithin-induced demyelination model...
August 14, 2017: EMBO Reports
https://www.readbyqxmd.com/read/28806929/myelination-is-delayed-during-postnatal-brain-development-in-the-mdx-mouse-model-of-duchenne-muscular-dystrophy
#20
Azeez Aranmolate, Nathaniel Tse, Holly Colognato
BACKGROUND: In Duchenne muscular dystrophy (DMD), the loss of the dystrophin component of the dystrophin-glycoprotein complex (DGC) compromises plasma membrane integrity in skeletal muscle, resulting in extensive muscle degeneration. In addition, many DMD patients exhibit brain deficits in which the cellular etiology remains poorly understood. We recently found that dystroglycan, a receptor component of the DGC that binds intracellularly to dystrophin, regulates the development of oligodendrocytes, the myelinating glial cells of the brain...
August 14, 2017: BMC Neuroscience
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