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Rna interference

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https://www.readbyqxmd.com/read/29244160/interplay-between-the-catabolite-repression-control-protein-crc-hfq-and-rna-in-hfq-dependent-translational-regulation-in-pseudomonas-aeruginosa
#1
Elisabeth Sonnleitner, Alexander Wulf, Sébastien Campagne, Xue-Yuan Pei, Michael T Wolfinger, Giada Forlani, Konstantin Prindl, Laetitia Abdou, Armin Resch, Frederic H-T Allain, Ben F Luisi, Henning Urlaub, Udo Bläsi
In Pseudomonas aeruginosa the RNA chaperone Hfq and the catabolite repression control protein (Crc) act as post-transcriptional regulators during carbon catabolite repression (CCR). In this regard Crc is required for full-fledged Hfq-mediated translational repression of catabolic genes. RNAseq based transcriptome analyses revealed a significant overlap between the Crc and Hfq regulons, which in conjunction with genetic data supported a concerted action of both proteins. Biochemical and biophysical approaches further suggest that Crc and Hfq form an assembly in the presence of RNAs containing A-rich motifs, and that Crc interacts with both, Hfq and RNA...
December 13, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29243818/the-function-of-two-type-ii-metacaspases-in-woody-tissues-of-populus-trees
#2
Benjamin Bollhöner, Soile Jokipii-Lukkari, Joakim Bygdell, Simon Stael, Mathilda Adriasola, Luis Muñiz, Frank Van Breusegem, Inés Ezcurra, Gunnar Wingsle, Hannele Tuominen
Metacaspases (MCs) are cysteine proteases that are implicated in programmed cell death of plants. AtMC9 (Arabidopsis thaliana Metacaspase9) is a member of the Arabidopsis MC family that controls the rapid autolysis of the xylem vessel elements, but its downstream targets in xylem remain uncharacterized. PttMC13 and PttMC14 were identified as AtMC9 homologs in hybrid aspen (Populus tremula × tremuloides). A proteomic analysis was conducted in xylem tissues of transgenic hybrid aspen trees which carried either an overexpression or an RNA interference construct for PttMC13 and PttMC14...
December 15, 2017: New Phytologist
https://www.readbyqxmd.com/read/29243000/rna-interference-based-therapy-and-its-delivery-systems
#3
Xiuhui Chen, Lingegowda S Mangala, Cristian Rodriguez-Aguayo, Xianchao Kong, Gabriel Lopez-Berestein, Anil K Sood
RNA interference (RNAi) is considered a highly specific approach for gene silencing and holds tremendous potential for treatment of various pathologic conditions such as cardiovascular diseases, viral infections, and cancer. Although gene silencing approaches such as RNAi are widely used in preclinical models, the clinical application of RNAi is challenging primarily because of the difficulty in achieving successful systemic delivery. Effective delivery systems are essential to enable the full therapeutic potential of RNAi...
December 14, 2017: Cancer Metastasis Reviews
https://www.readbyqxmd.com/read/29241845/crispr-cas9-mediated-knockout-of-two-eye-pigmentation-genes-in-the-brown-planthopper-nilaparvata-lugens-hemiptera-delphacidae
#4
Wen-Hua Xue, Nan Xu, Xiao-Bo Yuan, Hao-Hao Chen, Jin-Li Zhang, Sheng-Jie Fu, Chuan-Xi Zhang, Hai-Jun Xu
The brown planthopper Nilaparvata lugens is one of the most destructive insect pests in Asia, demonstrating high fertility and causing huge crop losses by sucking sap of rice as well as transmitting viruses. However, functional genomic studies on N. lugens are seriously constrained by lack of genetic tools. Here, we employed two eye pigmentation genes to generate germ-line mutations in N. lugens using the CRISPR/Cas9 (clustered regularly interspaced palindromic repeats/CRISPR-associated) system. We showed that injection of single guide RNA of the cinnabar gene of N...
December 11, 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29241096/study-of-non-covalent-interactions-on-dendriplex-formation-influence-of-hydrophobic-electrostatic-and-hydrogen-bonds-interactions
#5
María Sánchez-Milla, Isabel Pastor, Marek Maly, M Jesús Serramía, Rafael Gómez, Javier Sánchez-Nieves, Félix Ritort, M Ángeles Muñoz-Fernández, F Javier de la Mata
The interaction of a double stranded small interference RNA (siRNA Nef) with cationic carbosilane dendrimers of generations 1-3 with two different ammonium functions at the periphery ([-NMe2R]+, R=Me, (CH2)2OH) has been studied by experimental techniques (zeta potential, electrophoresis, single molecule pulling experiments) and molecular dynamic calculations. These studies state the presence of different forces on dendriplex formation, depending on generation and type of ammonium group. Whilst for higher dendrimers electrostatic forces mainly drive the stability of dendriplexes, first generation compounds can penetrate into siRNA strands due to the establishment of hydrophobic interactions...
December 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29241071/insights-on-ornithine-decarboxylase-silencing-as-a-potential-strategy-for-targeting-retinoblastoma
#6
Sivashanmugam Muthukumaran, Renganathan Bhuvanasundar, Vetrivel Umashankar, K N Sulochana
Ornithine Decarboxylase (ODC) is a key enzyme involved in polyamine synthesis and is reported to be up regulated in several cancers. However, the effect of ODC gene silencing in retinoblastoma is to be understood for utilization in therapeutic applications. Hence, in this study, a novel siRNA (small interference RNA) targeting ODC was designed and validated in Human Y79 retinoblastoma cells for its effects on intracellular polyamine levels, Matrix Metalloproteinase 2 & 9 activity and Cell cycle. The designed siRNA showed efficient silencing of ODC mRNA expression and protein levels in Y79 cells...
December 11, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29240998/orthogonality-and-burdens-of-heterologous-and-gate-gene-circuits-in-e-coli
#7
Qijun Liu, Jörg Schumacher, Xinyi Wan, Chunbo Lou, Baojun Wang
Synthetic biology approaches commonly introduce heterologous gene networks into a host to predictably program cells, with the expectation of the synthetic network being orthogonal to the host background. However, introduced circuits may interfere with the host's physiology, either indirectly by posing a metabolic burden and/or through unintended direct interactions between parts of the circuit with those of the host, affecting functionality. Here we used RNA-Seq transcriptome analysis to quantify the interactions between a representative heterologous AND gate circuit and the host Escherichia coli under various conditions including circuit designs and plasmid copy numbers...
December 14, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/29240875/the-expanding-roles-of-argonautes-rna-interference-splicing-and-beyond
#8
Xiaoxia Ma, Ziwei Zuo, Weishan Shao, Yongfeng Jin, Yijun Meng
Argonaute (AGO) protein family is highly conserved in eukaryotes and prokaryotes, reflecting its evolutionarily indispensible role in maintaining normal life cycle of the organisms. Small RNA-guided, AGO-dependent RNA interference (RNAi) is a well-studied pathway for gene expression regulation, which can be performed at transcriptional, posttranscriptional or translational level. In addition to RNAi, growing pieces of evidence point to a novel role of AGOs in pre-mRNA (messenger RNA precursor) splicing in animals...
December 11, 2017: Briefings in Functional Genomics
https://www.readbyqxmd.com/read/29237726/transmission-evolution-and-endogenization-lessons-learned-from-recent-retroviral-invasions
#9
REVIEW
Alex D Greenwood, Yasuko Ishida, Sean P O'Brien, Alfred L Roca, Maribeth V Eiden
Viruses of the subfamily Orthoretrovirinae are defined by the ability to reverse transcribe an RNA genome into DNA that integrates into the host cell genome during the intracellular virus life cycle. Exogenous retroviruses (XRVs) are horizontally transmitted between host individuals, with disease outcome depending on interactions between the retrovirus and the host organism. When retroviruses infect germ line cells of the host, they may become endogenous retroviruses (ERVs), which are permanent elements in the host germ line that are subject to vertical transmission...
March 2018: Microbiology and Molecular Biology Reviews: MMBR
https://www.readbyqxmd.com/read/29237698/oxys-small-rna-induces-cell-cycle-arrest-to-allow-dna-damage-repair
#10
Shir Barshishat, Maya Elgrably-Weiss, Jonathan Edelstein, Jens Georg, Sutharsan Govindarajan, Meytal Haviv, Patrick R Wright, Wolfgang R Hess, Shoshy Altuvia
To maintain genome integrity, organisms employ DNA damage response, the underlying principles of which are conserved from bacteria to humans. The bacterial small RNA OxyS of Escherichia coli is induced upon oxidative stress and has been implicated in protecting cells from DNA damage; however, the mechanism by which OxyS confers genome stability remained unknown. Here, we revealed an OxyS-induced molecular checkpoint relay, leading to temporary cell cycle arrest to allow damage repair. By repressing the expression of the essential transcription termination factor nusG, OxyS enables read-through transcription into a cryptic prophage encoding kilR The KilR protein interferes with the function of the major cell division protein FtsZ, thus imposing growth arrest...
December 13, 2017: EMBO Journal
https://www.readbyqxmd.com/read/29236776/an-adenylyl-cyclase-like-9-gene-nlac9-influences-growth-and-fecundity-in-the-brown-planthopper-nilaparvata-lugens-st%C3%A3-l-hemiptera-delphacidae
#11
LinQuan Ge, HaoTian Gu, Bo Huang, Qisheng Song, David Stanley, Fang Liu, Guo-Qing Yang, Jin-Cai Wu
The cAMP/PKA intracellular signaling pathway is launched by adenylyl cyclase (AC) conversion of adenosine triphosphate (ATP) to 3', 5'-cyclic AMP (cAMP) and cAMP-dependent activation of PKA. Although this pathway is very well known in insect physiology, there is little to no information on it in some very small pest insects, such as the brown planthopper (BPH), Nilaparvata lugens Stål. BPH is a destructive pest responsible for tremendous crop losses in rice cropping systems. We are investigating the potentials of novel pest management technologies from RNA interference perspective...
2017: PloS One
https://www.readbyqxmd.com/read/29236318/proliferation-and-apoptosis-of-rheumatoid-arthritis-fibroblast-like-synoviocytes-following-signal-transducer-and-activator-of-transcription-3-rna-interference-delivery
#12
Xuehui Sun, Yun Han, Ying Liu, Yanchun Tang, Jibo Wang
OBJECTIVE: In this study, we investigated the effects of delivering small interfering RNA (siRNA) for efficient STAT3 downregulation on propagation and apoptosis of rheumatoid arthritis fibroblast-like synoviocytes (RA-FLS). METHODS: The FLSs were transfected with three different siRNAs. RNAi-1 was selected for further experiments. The expression levels of both STAT3 mRNA and its protein were detected by RT-PCR and western blot. The proliferation of FLSs was examined by MTT assay...
December 13, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29235691/rna-interference-mediated-functional-characterization-of-aquaporin-genes-in-tribolium-castaneum
#13
X-X Yao, Q-W Meng, G-Q Li
An obvious challenge faced by most terrestrial insects is maintaining water homeostasis in an arid environment. Current research suggests aquaporins may be evolved to meet the challenge. However, up to now, this suggestion has not been verified in any insect that feeds upon solid food with mandibulate mouthparts. In the present paper, nine putative aquaporin genes [Tribolium castaneum big brain, T. castaneum Drosophila integral protein (TcDrip), T. castaneum Pyrocoelia rufa integral protein (TcPrip), T. castaneum aquaporin 12-like, T...
December 13, 2017: Insect Molecular Biology
https://www.readbyqxmd.com/read/29233744/a-flavonoid-compound-library-screen-revealed-potent-antiviral-activity-of-plant-derived-flavonoids-on-human-enterovirus-a71-replication
#14
Nyo Min, Leong Pok Thim, Regina Ching Hua Lee, Jeffery Seng Eng Khuan, Justin Jang Hann Chu
Hand Foot Mouth Disease (HFMD), resulting from human enterovirus A71 (HEVA71) infection can cause severe neurological complications leading to fatality in young children. Currently, there is no approved antiviral for therapeutic treatment against HEVA71 infection. In this study, a 500-compound flavonoid library was screened to identify potential inhibitors of HEVA71 using high-throughput immunofluorescence-based phenotypic screening method. Two lead flavonoid compounds, ST077124 and ST024734 at the non-cytotoxic concentration of 50 μM were found to be effective antivirals that inhibited replication of HEVA71, reducing infectious viral titers by 3...
December 9, 2017: Antiviral Research
https://www.readbyqxmd.com/read/29233047/rnai-of-grp78-may-disturb-the-fusion-of-icr-mouse-palate-cultured-in-vitro
#15
C Ren, X Li, X Li, Y Xie, H Fu, Z Yan, Y Zhu
RNA interference (RNAi) is a powerful tool to silence or minimize gene expression, and palate culture in vitro is an important technique for study of the palate development. Our previous study demonstrated that the gene expression of glucose-regulated protein-78 (Grp78) was downregulation in the all-trans retinoic acid-induced mouse models of cleft palate (CP) during embryogenesis. To find the role of Grp78, the small interfering RNA (siRNA) of this gene carried by fluorescent vector was injected with a microinjector, through which about 30 pmol siRNA was injected into the Institute of Cancer Research (ICR) mouse palate explants...
January 1, 2017: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/29232690/rna-interference-in-fasciola-gigantica-establishing-and-optimization-of-experimental-rnai-in-the-newly-excysted-juveniles-of-the-fluke
#16
Arun Anandanarayanan, Opinder Krishen Raina, Hniang Lalrinkima, Ajayta Rialch, Muthu Sankar, Anju Varghese
Fasciolosis caused by Fasciola gigantica is a neglected tropical disease but a constraint on the growth and productivity of cattle, buffaloes and sheep in the tropical countries of Asia and Africa. Resistance to commonly used anthelmintics in Fasciola has increased the need to search for alternative therapeutic targets. RNA interference is the current tool of choice in the search for such targets in Fasciola. The susceptibility of juvenile Fasciola hepatica to double stranded (ds) RNA induced RNAi has been established but in F...
December 12, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29230823/decreasing-fructose-1-6-bisphosphate-aldolase-activity-reduces-plant-growth-and-tolerance-to-chilling-stress-in-tomato-seedlings
#17
Bingbing Cai, Qiang Li, Fengjiao Liu, Huangai Bi, Xizhen Ai
In northern China, low temperatures are the most common abiotic stresses for tomato plants cultivated in solar-greenhouse in winter. We recently found that the expression and enzyme activity of fructose 1,6-bisphosphate aldolases in tomato (FBAs), which are important enzymes in the Calvin-Benson cycle (CBC), were significantly altered in tomato seedlings subjected to heat/cold stresses. In order to study the role of FBA in photosynthesis and in regulating cold stress responses of tomato seedlings (Solanum lycopersicum), we transformed a tomato inbred line (FF) with RNA interference (RNAi) vector containing SlFBA7 reverse tandem repeat sequence...
December 12, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/29229993/therapeutic-relevance-of-the-pp2a-b55-inhibitory-kinase-mastl-greatwall-in-breast-cancer
#18
Mónica Álvarez-Fernández, María Sanz-Flores, Belén Sanz-Castillo, María Salazar-Roa, David Partida, Elisabet Zapatero-Solana, H Raza Ali, Eusebio Manchado, Scott Lowe, Todd VanArsdale, David Shields, Carlos Caldas, Miguel Quintela-Fandino, Marcos Malumbres
PP2A is a major tumor suppressor whose inactivation is frequently found in a wide spectrum of human tumors. In particular, deletion or epigenetic silencing of genes encoding the B55 family of PP2A regulatory subunits is a common feature of breast cancer cells. A key player in the regulation of PP2A/B55 phosphatase complexes is the cell cycle kinase MASTL (also known as Greatwall). During cell division, inhibition of PP2A-B55 by MASTL is required to maintain the mitotic state, whereas inactivation of MASTL and PP2A reactivation is required for mitotic exit...
December 11, 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/29229918/negative-regulation-of-tgf-%C3%AE-1-induced-mkk6-p38-and-mek-erk-signalling-and-epithelial-mesenchymal-transition-by-rac1b
#19
David Witte, Hannah Otterbein, Maria Förster, Klaudia Giehl, Robert Zeiser, Hendrik Lehnert, Hendrik Ungefroren
Prompted by earlier findings that the Rac1-related isoform Rac1b inhibits transforming growth factor (TGF)-β1-induced canonical Smad signalling, we studied here whether Rac1b also impacts TGF-β1-dependent non-Smad signalling such as the MKK6-p38 and MEK-ERK mitogen-activated protein kinase (MAPK) pathways and epithelial-mesenchymal transition (EMT). Transient depletion of Rac1b protein in pancreatic cancer cells by RNA interference increased the extent and duration of TGF-β1-induced phosphorylation of p38 MAPK in a Smad4-independent manner...
December 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29228419/expression-and-clinical-significance-of-long-non-coding-rna-ghet1-in-pancreatic-cancer
#20
H-Y Zhou, H Zhu, X-Y Wu, X-D Chen, Z-G Qiao, X Ling, X-M Yao, J-H Tang
OBJECTIVE: To investigate the expression level and biological function of long non-coding RNA gastric carcinoma high expressed transcript 1 (lncRNA-GHET1) in pancreatic ductal adenocarcinoma (pancreatic cancer for short), to analyze the correlation between the expression of GHET1 and clinicopathological features and to explore the role and clinical significance of GHET1 in the development and progression of pancreatic cancer. PATIENTS AND METHODS: The relative expression of GHET1 in 5 human pancreatic cancer cell lines was detected by quantitative Real-time polymerase chain reaction (qRT-PCR)...
November 2017: European Review for Medical and Pharmacological Sciences
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