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DNA-directed RNA interference

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285: 63: 296:(Figure 2b). Designed to express two or more shRNAs, they can simultaneously target multiple sequences for degradation hence particularly a useful strategy for targeting viruses. Natural sequence variations can render a single shRNA-target site unrecognizable, preventing RNA degradation. Multi-cassette constructs that target multiple sites within the same viral RNA circumvent this issue. 120: 22: 248:) therapeutics that turn over within a cell and consequently only silence genes transiently, DNA constructs are continually transcribed, replenishing the cellular ‘dose’ of short-hairpin RNA (shRNA), thereby enabling long-term silencing of targeted genes. The ddRNAi mechanism, therefore, offers the potential for ongoing clinical benefit with reduced medical intervention. 281:
sequences of 20–30 nucleotides. Flexibility in construct design is possible; for example, the positions of sense and antisense sequences can be reversed, and other modifications and additions can alter intracellular shRNA processing. Moreover, a variety of promoter loop and terminator sequences can be used.
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Senzer, N.; Barve, M.; Kuhn, J.; Melnyk, A.; Beitsch, P.; Lazar, M.; Lifshitz, S.; Magee, M.; Oh, J.; Mill, S. W.; Bedell, C.; Higgs, C.; Kumar, P.; Yu, Y.; Norvell, F.; Phalon, C.; Taquet, N.; Rao, D. D.; Wang, Z.; Jay, C. M.; Pappen, B. O.; Wallraven, G.; Brunicardi, F. C.; Shanahan, D. M.; Maples,
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Two conserved PKCγ sequences across all key model species and humans have been identified, and both single and double DNA cassettes are designed. In vitro, the expression of PKCγ was silenced by 80%. When similar DDRNAI constructs were delivered intrathecally using a lentiviral vector, pain relief in
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Kleinman, M. E.; Yamada, K.; Takeda, A.; Chandrasekaran, V.; Nozaki, M.; Baffi, J. Z.; Albuquerque, R. J. C.; Yamasaki, S.; Itaya, M.; Pan, Y.; Appukuttan, B.; Gibbs, D.; Yang, Z.; Karikó, K.; Ambati, B. K.; Wilgus, T. A.; Dipietro, L. A.; Sakurai, E.; Zhang, K.; Smith, J. R.; Taylor, E. W.; Ambati,
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infection has not been associated with the induction of cancers in humans despite widespread prevalence across the general population. Moreover, extensive clinical use of AAV vectors has provided no evidence of carcinogenicity. While lentiviral vectors do integrate into the genome they do not appear
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vectors developed for the purpose. Delivery is a major challenge for RNAi-based therapeutics with new modifications and reagents continually being developed to optimize target cell delivery. Two broad strategies to facilitate the delivery of DNA constructs to the desired cells are available: these
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sequence driving the expression of sense and antisense sequences separated by a loop sequence, followed by a transcriptional terminator. The antisense sequence processed from the shRNA can bind to the target RNA and specify its degradation. shRNA constructs typically encode sense and antisense
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for replication. Biomics Biotechnologies has evaluated around 5000 siRNA sequences of this gene for effective knockdown; five sequences were chosen for further investigation and shown to have potent silencing activity when converted into shRNA expression cassettes. A multi-cassette construct,
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siRNAs have been shown to activate immune responses through interaction with Toll-like receptors leading to interferon responses. These receptors reside on the cell's surface and so DDRNAI constructs – delivered directly into intracellular space – are not expected to induce this response.
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Trollet, C.; Anvar, S. Y.; Venema, A.; Hargreaves, I. P.; Foster, K.; Vignaud, A.; Ferry, A.; Negroni, E.; Hourde, C.; Baraibar, M. A.; "t" hoen, P. A. C.; Davies, J. E.; Rubinsztein, D. C.; Heales, S. J.; Mouly, V.; Van Der Maarel, S. M.; Butler-Browne, G.; Raz, V.; Dickson, G. (2010).
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Suhy, D. A.; Kao, S. C.; Mao, T.; Whiteley, L.; Denise, H.; Souberbielle, B.; Burdick, A. D.; Hayes, K.; Wright, J. F.; Lavender, H.; Roelvink, P.; Kolykhalov, A.; Brady, K.; Moschos, S. A.; Hauck, B.; Zelenaia, O.; Zhou, S.; Scribner, C.; High, K. A.; Renison, S. H.; Corbau, R. (2012).
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An immunological response to an adenoviral vector resulted in the death of a patient in an early human trial. Careful monitoring of potential toxicities in preclinical testing and analyses of pre-existing antibodies to gene therapy vectors in patients minimizes such risks.
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Ringpis, G. E. E.; Shimizu, S.; Arokium, H.; Camba-Colón, J.; Carroll, M. V.; Cortado, R.; Xie, Y.; Kim, P. Y.; Sahakyan, A.; Lowe, E. L.; Narukawa, M.; Kandarian, F. N.; Burke, B. P.; Symonds, G. P.; An, D. S.; Chen, I. S.; Kamata, M. (2012). Speck, Roberto F (ed.).
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Rice, R. R.; Muirhead, A. N.; Harrison, B. T.; Kassianos, A. J.; Sedlak, P. L.; Maugeri, N. J.; Goss, P. J.; Davey, J. R.; James, D. E.; Graham, M. W. (2005). "Simple, Robust Strategies for Generating DNA-Directed RNA Interference Constructs".
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Tributarna is a triple DNA cassette expressing three shRNA molecules each of which separately targets beta III tubulin and strongly inhibits its expression. Studies in an orthotopic-mouse model, where the construct is delivered by a modified
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Digiusto, D. L.; Krishnan, A.; Li, L.; Li, H.; Li, S.; Rao, A.; Mi, S.; Yam, P.; Stinson, S.; Kalos, M.; Alvarnas, J.; Lacey, S. F.; Yee, J. -K.; Li, M.; Couture, L.; Hsu, D.; Forman, S. J.; Rossi, J. J.; Zaia, J. A. (2010).
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pre-transduced ex vivo with DDRNAI constructs using lentiviral vectors. This construct was designed to express three therapeutic RNAs, one of which was a shRNA, thereby combating HIV replication in three different ways:
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Unintended silencing of genes that share sequence homology with expressed shRNAs can theoretically occur. Careful selection of shRNA sequences and thorough preclinical testing of constructs can circumvent this issue.
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discussed above, the Center for Infection and Immunity Amsterdam (CINIMA), the University of Amsterdam, the Netherlands, is extensively researching the composition of multi-cassette DNA constructs to tackle HIV.
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Zou, W.; Song, Z.; Guo, Q.; Liu, C.; Zhang, Z.; Zhang, Y. (2011). "Intrathecal Lentiviral-Mediated RNA Interference Targeting PKCγ Attenuates Chronic Constriction Injury–Induced Neuropathic Pain in Rats".
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Jackson, A. L.; Bartz, S. R.; Schelter, J.; Kobayashi, S. V.; Burchard, J.; Mao, M.; Li, B.; Cavet, G.; Linsley, P. S. (2003). "Expression profiling reveals off-target gene regulation by RNAi".
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McBride, J. L.; Boudreau, R. L.; Harper, S. Q.; Staber, P. D.; Monteys, A. M.; Martins, I.; Gilmore, B. L.; Burstein, H.; Peluso, R. W.; Polisky, B.; Carter, B. J.; Davidson, B. L. (2008).
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Some gene therapy vectors integrate into the host genome, thereby acting as insertional mutagens. This was a particular issue with early retroviral vectors where insertions adjacent to
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Millington-Ward, S.; Chadderton, N.; O'Reilly, M.; Palfi, A.; Goldmann, T.; Kilty, C.; Humphries, M.; Wolfrum, U.; Bennett, J.; Humphries, P.; Kenna, P. F.; Farrar, G. J. (2011).
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This mechanism has been demonstrated to work as a novel therapeutic technique to silence disease-causing genes across a range of disease models, including viral diseases such as
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High-level expression of shRNAs has been shown to be toxic. Strategies to minimize levels of shRNA expression or promote precise processing of shRNAs can overcome this problem.
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Chen, C. -C.; Chang, C. -M.; Sun, C. -P.; Yu, C. -P.; Wu, P. -Y.; Jeng, K. -S.; Hu, C. -P.; Chen, P. -J.; Wu, J. -C.; Shih, C. H.; Gershwin, M. E.; Tao, M. -H. (2011).
1143:"Molecular and phenotypic characterization of a mouse model of oculopharyngeal muscular dystrophy reveals severe muscular atrophy restricted to fast glycolytic fibers" 35: 136:
Please remove or replace such wording and instead of making proclamations about a subject's importance, use facts and attribution to demonstrate that importance.
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delivery of DDRNAI constructs has been demonstrated using a range of vectors and reagents with different routes of administration (ROA).
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machinery continually manufactures the encoded RNAs. The shRNA molecules are then processed by endogenous systems before entering the
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Wang, G. P.; Levine, B. L.; Binder, G. K.; Berry, C. C.; Malani, N.; McGarrity, G.; Tebas, P.; June, C. H.; Bushman, F. D. (2009).
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Ongoing expression of the shRNA has been confirmed in T cells, monocytes, and B cells more than one year after transplantation.
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Liu, Y. P.; Westerink, J. T.; Brake, O.; Berkhout, B. (2011). "RNAi-Inducing Lentiviral Vectors for Anti-HIV-1 Gene Therapy".
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Figure 2 illustrates the most common type of DDRNAI DNA construct, designed to express a shRNA. This figure consists of a
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Delivery of DDRNAI DNA constructs is simplified by the existence of several clinically approved and well-characterized
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resulted in the development of lymphoid tumors. AAV vectors are considered low-risk for host-genome integration, as
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or reagent tailored to target specific cells. Inside the cell, the DNA is transported to the nucleus where
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Brake, O. T.; Hooft, K. 'T.; Liu, Y. P.; Centlivre, M.; Jasmijn Von Eije, K.; Berkhout, B. (2008).
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Gu, S.; Jin, L.; Zhang, Y.; Huang, Y.; Zhang, F.; Valdmanis, P. N.; Kay, M. A. (2012).
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It may require cleanup to comply with Knowledge (XXG)'s content policies, particularly
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Lambeth, L. S.; Smith, C. A. (2013). "Short Hairpin RNA-Mediated Gene Silencing".
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Nervana is an investigational V construct that knocks down the expression of
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Woods, N. B.; Bottero, V.; Schmidt, M.; Von Kalle, C.; Verma, I. M. (2006).
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Figure 1: A DDRNAI construct encoding a shRNA is packaged into a delivery
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DDRNAI constructs have also been successfully delivered into host cells
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Hepbarna, is under preclinical development for delivery by an
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TAR decoy RNA, inhibiting initiation of viral transcription.
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shRNA, that silences the tat and rev genes of the HIV genome
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vector, jetPEI, that targets lung tissue are in progress.
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The development of resistance to chemotherapies such as
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to show a propensity to activate oncogene expression.
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use either viral vectors or one of several classes of
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A major contributor to this article appears to have a
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A.; Gan, P. P.; Liu, M.; 619: 502:Immune response to gene therapy vectors 485:Oncogene activation by viral insertion 7: 466:City of Hope National Medical Center 464:Besides the ex vivo approach by the 333:City of Hope National Medical Center 127:This article contains wording that 444:Oculopharyngeal muscular dystrophy 440:8 (AAV-8) liver-targeting vector. 132:without imparting real information 14: 272:Organization of DDRNAI constructs 31:This article has multiple issues. 118: 82:. Please discuss further on the 61: 20: 288:Figure 2: ddRNAi DNA constructs 39:or discuss these issues on the 930:P. B.; Nemunaitis, J. (2011). 687:Science Translational Medicine 341:hematopoietic progenitor cells 244:Unlike small interfering RNA ( 1: 861:10.1158/0008-5472.CAN-09-4487 554:10.1016/S0076-6879(04)92024-1 183:DNA-directed RNA interference 1108:10.1371/journal.pone.0053492 699:10.1126/scitranslmed.3000931 640:10.1007/978-1-62703-119-6_12 589:10.1007/978-1-61779-037-9_18 427:Hepatitis B viral infection 1561: 1049:10.1016/j.cell.2012.09.042 405:non-small-cell lung cancer 292:A beneficial variant is a 1147:Human Molecular Genetics 362:Therapeutic applications 189:technique that utilizes 1424:10.1073/pnas.0801775105 232:, advanced cancer, and 1545:Biotechnology products 511:Innate immune response 495:adeno-associated virus 438:adeno-associated virus 337:non-Hodgkin's lymphoma 289: 268: 1201:10.1038/sj.mt.6300382 287: 254: 80:neutral point of view 1458:Nature Biotechnology 905:10.1089/hum.2010.207 234:retinitis pigmentosa 199:double-stranded RNAs 1535:Genetic engineering 1415:2008PNAS..105.5868M 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(2008). 226:lung cancer 222:hepatitis C 218:hepatitis B 1540:Stem cells 1499:Categories 615:References 397:paclitaxel 313:reagents. 36:improve it 491:oncogenes 401:cisplatin 142:June 2014 92:June 2014 84:talk page 42:talk page 1486:24778534 1478:12754523 1443:18398004 1384:18368052 1326:19259065 1269:16641981 1220:18180777 1169:20207626 1127:23300932 1087:PLOS ONE 1067:23141545 1018:21224835 966:22186789 913:21087146 870:20501838 842:(2010). 822:22735378 761:21562593 717:20555022 658:23027054 607:21431693 572:15644195 460:HIV/AIDS 300:Delivery 278:promoter 209:target. 1434:2311380 1411:Bibcode 1375:2642938 1354:Bibcode 1317:2835137 1277:4372110 1247:Bibcode 1211:7172400 1118:3534037 1095:Bibcode 1058:3499986 1009:3070095 957:3293620 813:3437581 708:3130552 326:ex vivo 318:In vivo 1484:  1476:  1441:  1431:  1382:  1372:  1346:Nature 1324:  1314:  1275:  1267:  1239:Nature 1218:  1208:  1167:  1125:  1115:  1065:  1055:  1016:  1006:  964:  954:  911:  868:  820:  810:  759:  715:  705:  656:  646:  605:  595:  570:  560:  454:PABPN1 257:vector 1482:S2CID 1273:S2CID 246:siRNA 1474:PMID 1439:PMID 1380:PMID 1322:PMID 1265:PMID 1216:PMID 1165:PMID 1123:PMID 1063:PMID 1037:Cell 1014:PMID 962:PMID 909:PMID 866:PMID 818:PMID 757:PMID 713:PMID 654:PMID 644:ISBN 603:PMID 593:ISBN 568:PMID 558:ISBN 399:and 379:and 265:RNAi 207:mRNA 1510:DNA 1505:RNA 1466:doi 1429:PMC 1419:doi 1407:105 1370:PMC 1362:doi 1350:452 1312:PMC 1304:doi 1255:doi 1243:440 1206:PMC 1196:doi 1155:doi 1113:PMC 1103:doi 1053:PMC 1045:doi 1041:151 1004:PMC 996:doi 952:PMC 944:doi 901:doi 856:doi 808:PMC 800:doi 747:doi 703:PMC 695:doi 636:doi 585:doi 550:doi 403:in 220:or 214:HIV 191:DNA 1501:: 1480:. 1472:. 1462:21 1460:. 1437:. 1427:. 1417:. 1405:. 1401:. 1378:. 1368:. 1360:. 1348:. 1344:. 1320:. 1310:. 1300:17 1298:. 1294:. 1271:. 1263:. 1253:. 1241:. 1237:. 1214:. 1204:. 1192:16 1190:. 1186:. 1163:. 1151:19 1149:. 1145:. 1121:. 1111:. 1101:. 1089:. 1085:. 1061:. 1051:. 1039:. 1035:. 1012:. 1002:. 992:19 990:. 986:. 974:^ 960:. 950:. 940:20 938:. 934:. 921:^ 907:. 897:22 895:. 878:^ 864:. 852:70 850:. 846:. 830:^ 816:. 806:. 796:20 794:. 790:. 769:^ 755:. 743:19 741:. 737:. 725:^ 711:. 701:. 689:. 685:. 666:^ 652:. 642:. 622:^ 601:. 591:. 566:. 556:. 383:. 236:. 228:, 216:, 45:. 1488:. 1468:: 1445:. 1421:: 1413:: 1386:. 1364:: 1356:: 1328:. 1306:: 1279:. 1257:: 1249:: 1222:. 1198:: 1171:. 1157:: 1129:. 1105:: 1097:: 1091:7 1069:. 1047:: 1020:. 998:: 968:. 946:: 915:. 903:: 872:. 858:: 824:. 802:: 763:. 749:: 719:. 697:: 691:2 660:. 638:: 609:. 587:: 574:. 552:: 173:) 167:( 155:) 149:( 144:) 140:( 134:. 105:) 99:( 94:) 90:( 86:. 52:) 48:(

Index

improve it
talk page
Learn how and when to remove these messages
close connection
neutral point of view
talk page
Learn how and when to remove this message
promotes the subject in a subjective manner
Learn how and when to remove this message
Learn how and when to remove this message
gene-silencing
DNA
RNA interference
double-stranded RNAs
short-hairpin RNAs
mRNA
HIV
hepatitis B
hepatitis C
lung cancer
neuropathic pain
retinitis pigmentosa
siRNA
text
vector
transcription
RNAi
promoter
text
multi-cassette

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