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Morpholino

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phenotype with a second, non-overlapping Morpholino targeting the same mRNA, by confirmation of the observed phenotypes by comparing with a mutant strain (though compensation will obscure a phenotype in some mutants), by testing the Morpholino in a null mutant background to detect additional phenotypic changes or by dominant-negative methods. As mentioned above, rescue of observed phenotypes by coinjecting a rescue mRNA is, when feasible, a reliable test of specificity of a Morpholino.
3634: 407: 458: 31: 339: 438:). This is useful experimentally when an investigator wishes to know the function of a particular protein; Morpholinos provide a convenient means of knocking down expression of the protein and learning how that knockdown changes the cells or organism. Some Morpholinos knock down expression so effectively that, after degradation of preexisting proteins, the targeted proteins become undetectable by 702:). Though they permeate through intercellular spaces in tissues effectively, unconjugated PMOs have limited distribution into the cytosol and nuclear spaces within healthy tissues following IV administration. Systemic delivery into many cells in adult organisms can be accomplished by using covalent conjugates of Morpholino oligos with 108:, but this usage is not consistent across scientific literature. Morpholino oligos are sometimes referred to as PMO (for phosphorodiamidate morpholino oligomer), especially in medical literature. Vivo-Morpholinos and PPMO are modified forms of Morpholinos with chemical groups covalently attached to facilitate entry into cells. 114:
is achieved by reducing the expression of a particular gene in a cell. In the case of protein-coding genes, this usually leads to a reduction in the quantity of the corresponding protein in the cell. Knocking down gene expression is a method for learning about the function of a particular protein; in
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using another antisense structural type, showing the p53-mediated apoptosis to be a consequence of the loss of the targeted protein and not a consequence of the knockdown oligo type. It appears that these effects are sequence-specific; as in most cases, if a Morpholino is associated with non-target
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oligos with irrelevant sequences usually produce no change in embryonic phenotype, evidence of the Morpholino oligo's sequence-specificity and lack of non-antisense effects. The dose required for a knockdown can be reduced by coinjection of several Morpholino oligos targeting the same mRNA, which is
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encodes the protein of interest. Translation of the rescue mRNA replaces production of the protein that was knocked down by the Morpholino. Since the rescue mRNA would not affect phenotypic changes due to the Morpholino's off-target gene expression modulation, this return to wild-type phenotype is
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into the cytosol of a cell. Once in the cytosol, Morpholinos freely diffuse between the cytosol and nucleus, as demonstrated by the nuclear splice-modifying activity of Morpholinos observed after microinjection into the cytosol of cells. Different methods are used for delivery into embryos, into
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In embryos, Morpholinos can be tested in null mutants to check for unexpected RNA interactions, then used in a wild-type embryo to reveal the acute knockdown phenotype. The knockdown phenotype is often more extreme than the mutant phenotype; in the mutant, effects of losing the null gene can be
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phenotype is due to the intended knockdown or an interaction with an off-target RNA can often be addressed in embryos by running another experiment to confirm that the observed morphant phenotype results from the knockdown of the expected target. This can be done by recapitulating the morphant
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for effective oligo delivery at doses below those causing observed toxicity. An octa-guanidinium dendrimer attached to the end of a Morpholino can deliver the modified oligo (called a Vivo-Morpholino) from the blood to the cytosol. Delivery-enabled Morpholinos, such as peptide conjugates and
548:. Morpholinos can block RNA editing, poly(A) tailing and translocation sequences. Morpholino activities against this variety of targets suggest that Morpholinos can be used as a general-purpose tool for blocking interactions of proteins or nucleic acids with mRNA. 280:). Instead, Morpholinos act by "steric blocking", binding to a target sequence within an RNA, inhibiting molecules that might otherwise interact with the RNA. Morpholino oligos are often used to investigate the role of a specific mRNA transcript in an 2962:
Abes S, Moulton HM, Clair P, Prevot P, Youngblood DS, Wu RP, Iversen PL, Lebleu B (December 2006). "Vectorization of morpholino oligomers by the (R-Ahx-R)4 peptide allows efficient splicing correction in the absence of endosomolytic agents".
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and can be strongly affected by an off-target interaction. Following initial injections into frog or fish embryos at the single-cell or few-cell stages, Morpholino effects can be measured up to five days later, after most of the processes of
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Amantana A, Moulton HM, Cate ML, Reddy MT, Whitehead T, Hassinger JN, Youngblood DS, Iversen PL (2007). "Pharmacokinetics, biodistribution, stability and toxicity of a cell-penetrating peptide-morpholino oligomer conjugate".
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phenotype to the embryos and provide evidence for the specificity of a Morpholino. In an mRNA rescue, a Morpholino is co-injected with an mRNA that codes for the morphlino's protein. However, the rescue mRNA has a modified
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Fletcher S, Honeyman K, Fall AM, Harding PL, Johnsen RD, Wilton SD (February 2006). "Dystrophin expression in the mdx mouse after localised and systemic administration of a morpholino antisense oligonucleotide".
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Stainier DY, Raz E, Lawson ND, Ekker SC, Burdine RD, Eisen JS, Ingham PW, Schulte-Merker S, Yelon D, Weinstein BM, Mullins MC, Wilson SW, Ramakrishnan L, Amacher SL, Neuhauss SC, Meng A, Mochizuki N, Panula P,
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Kos R, Reedy MV, Johnson RL, Erickson CA (April 2001). "The winged-helix transcription factor FoxD3 is important for establishing the neural crest lineage and repressing melanogenesis in avian embryos".
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or inhibit the maturation and activity of miRNA. Techniques for targeting Morpholinos to RNAs and delivering Morpholinos into cells have recently been reviewed in a journal article and in book form.
667:, which can deliver oligos into tissues of later embryonic stages. Common techniques for delivery into cultured cells include the Endo-Porter peptide (which causes the Morpholino to be released from 2773:
Jubin R (2004). "Optimizing electroporation conditions for intracellular delivery of Morpholino antisense oligonucleotides directed against the hepatitis C virus internal ribosome entry site".
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Kamachi Y, Okuda Y, Kondoh H (January 2008). "Quantitative assessment of the knockdown efficiency of morpholino antisense oligonucleotides in zebrafish embryos using a luciferase assay".
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Yen L, Svendsen J, Lee JS, Gray JT, Magnier M, Baba T, D'Amato RJ, Mulligan RC (September 2004). "Exogenous control of mammalian gene expression through modulation of RNA self-cleavage".
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Howard EW, Newman LA, Oleksyn DW, Angerer RC, Angerer LM (February 2001). "SpKrl: a direct target of beta-catenin regulation required for endoderm differentiation in sea urchin embryos".
1135: 398:, is converted into the structure of a protein. A Morpholino can modify splicing, block translation, or block other functional sites on RNA depending on the Morpholino's base sequence. 633:
and can be suppressed by co-injection of an anti-p53 Morpholino along with the experimental Morpholino. Moreover, the p53-mediated apoptotic effect of a Morpholino knockdown has been
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apparatus is usually used for delivery into an embryo, with injections most commonly performed at the single-cell or few-cell stage; an alternative method for embryonic delivery is
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from the mature mRNA. Targeting some splice targets results in intron inclusions, while activation of cryptic splice sites can lead to partial inclusions or exclusions. Targets of
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activity. U2 and U12 snRNP functions have been inhibited by Morpholinos. Morpholinos targeted to "slippery" mRNA sequences within protein coding regions can induce translational
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Youngblood DS, Hatlevig SA, Hassinger JN, Iversen PL, Moulton HM (2007). "Stability of cell-penetrating peptide-morpholino oligomer conjugates in human serum and in cells".
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Kipshidze NN, Kim HS, Iversen P, Yazdi HA, Bhargava B, New G, Mehran R, Tio F, Haudenschild C, Dangas G, Stone GW, Iyer S, Roubin GS, Leon MB, Moses JW (May 2002).
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Partridge M, Vincent A, Matthews P, Puma J, Stein D, Summerton J (1996). "A simple method for delivering morpholino antisense oligos into the cytoplasm of cells".
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McClorey G, Fall AM, Moulton HM, Iversen PL, Rasko JE, Ryan M, Fletcher S, Wilton SD (October 2006). "Induced dystrophin exon skipping in human muscle explants".
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Li YF, Morcos PA (July 2008). "Design and synthesis of dendritic molecular transporter that achieves efficient in vivo delivery of morpholino antisense oligo".
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base and preventing it from forming the splice lariat structure, or by interfering with the binding of splice regulatory proteins such as splice silencers and
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Hudziak RM, Barofsky E, Barofsky DF, Weller DL, Huang SB, Weller DD (1996). "Resistance of morpholino phosphorodiamidate oligomers to enzymatic degradation".
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further evidence of Morpholino specificity. In some cases, ectopic expression of the rescue RNA makes recovery of the wild-type phenotype impossible.
1709:"Peptide-conjugated phosphorodiamidate morpholino oligomer (PPMO) restores carbapenem susceptibility to NDM-1-positive pathogens in vitro and in vivo" 3179:
that consists of a series of peer-reviewed short papers using Morpholino knock downs of gene function in various animal and tissue culture systems.
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range, so Morpholinos in organisms or cells are uncharged molecules. The entire backbone of a Morpholino is made from these modified subunits.
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Cerda GA, Thomas JE, Allende ML, Karlstrom RO, Palma V (July 2006). "Electroporation of DNA, RNA, and morpholinos into zebrafish embryos".
2923:"Intramural coronary delivery of advanced antisense oligonucleotides reduces neointimal formation in the porcine stent restenosis model" 104:
ring. To help avoid confusion with other morpholine-containing molecules, when describing oligos "Morpholino" is often capitalized as a
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is usually difficult, though there are a few systems allowing useful uptake of unmodified Morpholino oligos (including uptake into
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structure. Usually 25 bases in length, they bind to complementary sequences of RNA or single-stranded DNA by standard nucleic acid
1799:"Aberrant splicing in the ocular albinism type 1 gene (OA1/GPR143) is corrected in vitro by morpholino antisense oligonucleotides" 126:
by that exon or can sometimes knock down the protein activity altogether. These molecules have been applied to studies in several
3229: 256:. The figure compares the structures of the two strands depicted there, one of RNA and the other of a Morpholino. Replacement of 512:
snRNPs can also be blocked. Splice modification can be conveniently assayed by reverse-transcriptase polymerase chain reaction (
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Sully EK, Geller BL, Li L, Moody CM, Bailey SM, Moore AL, Wong M, Nordmann P, Daly SM, Sturge CR, Greenberg DE (March 2017).
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Deas TS, Bennett CJ, Jones SA, Tilgner M, Ren P, Behr MJ, Stein DA, Iversen PL, Kramer LD, Bernard KA, Shi PY (July 2007).
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groups. Morpholinos block access of other molecules to small (~25 base) specific sequences of the base-pairing surfaces of
2220:"Steric antisense inhibition of AMPA receptor Q/R editing reveals tight coupling to intronic editing sites and splicing" 272:
Morpholinos do not trigger the degradation of their target RNA molecules, unlike many antisense structural types (e.g.,
446: 3315: 834:"Targeted inhibition of miRNA maturation with morpholinos reveals a role for miR-375 in pancreatic islet development" 1587:
Summerton JE (November 2005). "Endo-Porter: a novel reagent for safe, effective delivery of substances into cells".
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Summerton J (December 1999). "Morpholino antisense oligomers: the case for an RNase H-independent structural type".
3602: 3182:"Peptide Nucleic Acids, Morpholinos and Related Antisense Biomolecules." eds. Janson & During (Springer, 2007) 3607: 3173:
Wiley-Liss, Inc. Special Issue: Morpholino Gene Knockdowns of genesis Volume 30, Issue 3 Pages 89-200 (July 2001)
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Morcos PA (June 2007). "Achieving targeted and quantifiable alteration of mRNA splicing with Morpholino oligos".
790:"Inhibition of zebrafish fgf8 pre-mRNA splicing with morpholino oligos: a quantifiable method for gene knockdown" 2022:"Revealing details: whole mount microRNA in situ hybridization protocol for zebrafish embryos and adult tissues" 473:) complexes from binding to their targets at the borders of introns on a strand of pre-mRNA, or by blocking the 907: 899: 591: 390:
begins. This entire process is referred to as gene expression; it is the process by which the information in a
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embryos at later development stages. With appropriate cytosolic delivery systems, Morpholinos are effective in
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A cause for concern in the use of Morpholinos is the potential for "off-target" effects. Whether an observed
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to be spliced out of the RNA transcript encoding a protein can help to determine the function of the protein
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Summerton J, Weller D (June 1997). "Morpholino antisense oligomers: design, preparation, and properties".
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Summerton JE (2017). "Invention and Early History of Morpholinos: From Pipe Dream to Practical Products".
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phosphates with the uncharged phosphorodiamidate groups eliminates ionization in the usual physiological
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Vorlová S, Rocco G, Lefave CV, Jodelka FM, Hess K, Hastings ML, Henke E, Cartegni L (September 2011).
1883:"Splicing segregation: the minor spliceosome acts outside the nucleus and controls cell proliferation" 1797:
Vetrini F, Tammaro R, Bondanza S, Surace EM, Auricchio A, De Luca M, Ballabio A, Marigo V (May 2006).
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Because of their completely unnatural backbones, Morpholinos are not recognized by cellular proteins.
3665: 1643:"Vivo-Morpholinos: a non-peptide transporter delivers Morpholinos into a wide array of mouse tissues" 1115:"Press Announcements - FDA grants accelerated approval to first drug for Duchenne muscular dystrophy" 720: 226: 2820: 1024:"In vitro resistance selection and in vivo efficacy of morpholino oligomers against West Nile virus" 3685: 3186:
Moulton J (2007). "Using Morpholinos to Control Gene Expression (Unit 4.30)". In Beaucage S (ed.).
1436:"Beta-catenin signaling activity dissected in the early Xenopus embryo: a novel antisense approach" 926: 703: 570: 481: 427: 351: 2998:
Burrer R, Neuman BW, Ting JP, Stein DA, Moulton HM, Iversen PL, Kuhn P, Buchmeier MJ (June 2007).
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is that, while Morpholinos have standard nucleic acid bases, those bases are bound to methylene
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Morcos PA (July 2001). "Achieving efficient delivery of morpholino oligos in cultured cells".
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an effective strategy for reducing or eliminating dose-dependent off-target RNA interactions.
3514: 3358: 2171:"Efficient stimulation of site-specific ribosome frameshifting by antisense oligonucleotides" 876: 725: 537: 423: 383: 3000:"Antiviral effects of antisense morpholino oligomers in murine coronavirus infection models" 536:-tagged Morpholinos combined with fluorescein-specific antibodies can be used as probes for 3680: 3549: 3532: 3363: 2078: 1596: 1391:
Nasevicius A, Ekker SC (October 2000). "Effective targeted gene 'knockdown' in zebrafish".
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Robu ME, Larson JD, Nasevicius A, Beiraghi S, Brenner C, Farber SA, Ekker SC (May 2007).
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processing steps either by preventing splice-directing small nuclear ribonucleoproteins (
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In 2016 a synthetic peptide-conjugated PMO (PPMO) was found to inhibit the expression of
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usually starts by binding at the 5' end of the mRNA and is joined there by various other
359: 147: 74: 2082: 1600: 1273:. Methods in Molecular Biology. Vol. 1565. Humana Press (Springer). pp. 1–15. 671:), the Special Delivery system (no longer commercially available, used a Morpholino-DNA 3438: 3433: 3308: 3146: 3119: 3024: 2999: 2903: 2859: 2808: 2705: 2680: 2656: 2629: 2494: 2467: 2400: 2375: 2344: 2317: 2293: 2268: 2244: 2219: 2195: 2170: 2102: 2046: 2021: 1997: 1972: 1828: 1733: 1708: 1620: 1416: 1338: 1251: 1196: 1096: 1048: 1023: 974: 860: 833: 193:, although the approval process was mired in controversy. Other Morpholino-based drugs 120: 78: 2939: 2922: 2146: 2121: 1948: 1923: 1369: 955:. Methods in Molecular Biology. Vol. 1565. Humana Press (Springer). p. 284. 77:
contains DNA bases attached to a backbone of methylenemorpholine rings linked through
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Kloosterman WP, Lagendijk AK, Ketting RF, Moulton JD, Plasterk RH (August 2007).
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Up to 18% of Morpholinos appear to induce nontarget-related phenotypes including
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Vivo-Morpholinos, show promise as therapeutics for viral and genetic diseases.
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tissues of zebrafish embryos. Most of these effects are due to activation of
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Arthur PK, Claussen M, Koch S, Tarbashevich K, Jahn O, Pieler T (July 2009).
1326: 1239: 1184: 655: 595: 566: 273: 2334: 1973:"Zebrafish miR-214 modulates Hedgehog signaling to specify muscle cell fate" 1608: 1215: 1160: 284:. Developmental biologists inject Morpholino oligos into eggs or embryos of 3582: 3402: 3375: 3320: 3239: 3155: 3104: 3069: 3033: 2984: 2948: 2899: 2800: 2759: 2714: 2665: 2614: 2573: 2503: 2444: 2409: 2353: 2302: 2253: 2204: 2155: 2098: 2055: 2006: 1957: 1908: 1867: 1824: 1783: 1742: 1668: 1616: 1570: 1532: 1524: 1496: 1461: 1452: 1435: 1412: 1377: 1296: 1247: 1192: 1092: 1057: 1005: 892: 869: 815: 771: 762: 745: 672: 439: 418:
of messenger RNA (mRNA), Morpholinos can interfere with progression of the
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Flynt AS, Li N, Thatcher EJ, Solnica-Krezel L, Patton JG (February 2007).
1488: 1334: 449:, an enzyme that many drug-resistant bacteria use to destroy carbapenems. 320:. Vivo-Morpholinos, in which the oligo is covalently linked to a delivery 96:
This article discusses only the Morpholino antisense oligomers, which are
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effects, the 4-base mismatch Morpholino will not trigger these effects.
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do not degrade Morpholinos, nor are they degraded in serum or in cells.
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Bill BR, Petzold AM, Clark KJ, Schimmenti LA, Ekker SC (March 2009).
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initiation complex from the 5' cap to the start codon. This prevents
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Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression
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systems, which have a broader range of gene expression than adult
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König H, Matter N, Bader R, Thiele W, Müller F (November 2007).
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For a Morpholino to be effective, it must be delivered past the
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Other applications: blocking other mRNA sites and use as probes
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Eukaryotic gene expression without intervention by a Morpholino
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in September 2016 for the treatment of some mutations causing
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Kloosterman WP, Wienholds E, Ketting RF, Plasterk RH (2004).
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Morpholinos have become a standard knockdown tool in animal
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delivery reagent), electroporation, or scrape loading.
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Segment of a Morpholino-RNA heteroduplex, 8-mer shown
2589:"Morphant technology in model developmental systems" 2169:Howard MT, Gesteland RF, Atkins JF (October 2004). 1848:
Biochemical and Biophysical Research Communications
992:Geller BL (April 2005). "Antibacterial antisense". 944: 85:(RNA). Morpholinos are used as research tools for 2422: 2369: 2367: 2365: 2363: 2068: 1706: 1433: 1308: 1306: 787: 585:mRNA rescue experiments can sometimes restore the 2678: 2020:Lagendijk AK, Moulton JD, Bakkers J (June 2012). 927:"Guide for Morpholino Users: Toward Therapeutics" 3652: 552:Specificity, stability and non-antisense effects 2456: 2454: 2360: 2217: 1390: 1312: 1303: 746:"Morpholino oligos: making sense of antisense?" 362:out, then the mature mRNA is exported from the 213:Morpholino oligos were conceived by Summerton ( 950: 452: 232:that are the product of a redesign of natural 3223: 2927:Journal of the American College of Cardiology 2836:Antisense & Nucleic Acid Drug Development 2679:Rosen JN, Sweeney MF, Mably JD (March 2009). 2519:Antisense & Nucleic Acid Drug Development 1640: 1315:Antisense & Nucleic Acid Drug Development 827: 825: 788:Draper BW, Morcos PA, Kimmel CB (July 2001). 3117: 2468:"Guidelines for morpholino use in zebrafish" 2451: 2218:Penn AC, Balik A, Greger IH (January 2013). 1755: 1636: 1634: 1582: 1580: 1158: 1133: 3189:Current Protocols in Nucleic Acid Chemistry 2586: 2119: 3237: 3230: 3216: 3192:. New Jersey: John Wiley & Sons, Inc. 2630:"p53 activation by knockdown technologies" 2376:"A primer for morpholino use in zebrafish" 1641:Morcos PA, Li Y, Jiang S (December 2008). 1589:Annals of the New York Academy of Sciences 1434:Heasman J, Kofron M, Wylie C (June 2000). 1159:Roshmi, R. R.; Yokota, T. (October 2019). 1134:Commissioner, Office of the (2019-12-12). 910:|...|intentional=yes}} 822: 3145: 3135: 3023: 2938: 2749: 2704: 2655: 2645: 2604: 2493: 2483: 2399: 2343: 2333: 2292: 2243: 2194: 2145: 2045: 1996: 1947: 1898: 1814: 1773: 1756:Bruno IG, Jin W, Cote GJ (October 2004). 1732: 1713:The Journal of Antimicrobial Chemotherapy 1658: 1631: 1586: 1577: 1544: 1542: 1451: 1355: 1268: 1047: 994:Current Opinion in Molecular Therapeutics 859: 849: 805: 761: 410:Translation blocked by a Morpholino oligo 3082: 783: 781: 659:cultured cells or into adult animals. A 456: 405: 337: 29: 3185: 1213: 1064: 924: 743: 577:consistent with target-gene knockdown. 401: 185:received accelerated approval from the 3653: 1845: 1548: 1539: 1349: 1017: 1015: 991: 461:Splicing blocked by a Morpholino oligo 48:phosphorodiamidate Morpholino oligomer 3211: 2772: 1028:Antimicrobial Agents and Chemotherapy 951:Moulton HM, Moulton JD, eds. (2017). 778: 426:of the coding region of the targeted 115:a similar manner, causing a specific 918: 528:Morpholinos have been used to block 516:) and is seen as a band shift after 394:, encoded as a sequence of bases in 328:Normal gene expression in eukaryotes 2322:The Journal of Biological Chemistry 2120:Matter N, König H (February 2005). 1012: 603:concealed by genetic compensation. 13: 3165: 3118:Moulton JD, Jiang S (March 2009). 2777:. Vol. 106. pp. 309–22. 484:. Preventing the binding of snRNP 157:Morpholinos are in development as 146:. Morpholinos can also modify the 14: 3702: 3354:Micro 2685:Journal of Visualized Experiments 2587:Ekker SC, Larson JD (July 2001). 540:to miRNAs. Morpholinos can block 3633: 3632: 447:New Delhi Metallo-beta-lactamase 3309:precursor, heterogenous nuclear 3111: 3076: 3040: 2991: 2955: 2914: 2870: 2827: 2766: 2721: 2672: 2621: 2580: 2545: 2510: 2416: 2309: 2260: 2211: 2162: 2113: 2062: 2013: 1964: 1915: 1874: 1839: 1790: 1749: 1700: 1675: 1503: 1468: 1427: 1384: 1207: 1152: 1127: 934:J Drug Discov Develop and Deliv 465:Morpholinos can interfere with 187:US Food and Drug Administration 3439:Trans-acting small interfering 3403:Enhancer RNAs 3321:Transfer 1177:10.1358/dot.2019.55.10.3045038 1107: 985: 737: 698:cells stressed during balloon 161:therapeutics targeted against 1: 3326:Ribosomal 3304:Messenger 3175:. This is a special issue of 2977:10.1016/j.jconrel.2006.09.011 2965:Journal of Controlled Release 2940:10.1016/S0735-1097(02)01830-2 1653:(6): 613–4, 616, 618 passim. 1370:10.1016/S0167-4781(99)00150-5 875:(This paper currently has an 731: 376:eukaryotic initiation factors 2880:The Journal of Gene Medicine 2647:10.1371/journal.pgen.0030078 2485:10.1371/journal.pgen.1007000 2285:10.1016/j.molcel.2011.08.009 1216:"Casimersen: First Approval" 1120:Food and Drug Administration 885:10.1371/journal.pbio.3001631 851:10.1371/journal.pbio.0050203 220: 7: 2742:10.1016/j.ymeth.2005.12.009 1279:10.1007/978-1-4939-6817-6_1 714: 692:Duchenne muscular dystrophy 649: 453:Modifying pre-mRNA splicing 370:. The small subunit of the 267: 191:Duchenne muscular dystrophy 10: 3707: 3505:Multicopy single-stranded 3349:Interferential 1900:10.1016/j.cell.2007.09.043 1860:10.1016/j.bbrc.2007.04.172 1232:10.1007/s40265-021-01512-2 1214:Shirley, Matt (May 2021). 532:activity and maturation. 331: 208: 177:. A Morpholino-based drug 18: 3628: 3563: 3513: 3456: 3419:Guide 3411: 3339: 3294: 3277: 3246: 3137:10.3390/molecules14031304 2783:10.1385/1-59259-854-4:309 1085:10.1016/j.nmd.2006.05.017 961:10.1007/978-1-4939-6817-6 721:Oligonucleotide synthesis 704:cell-penetrating peptides 3381:Small nuclear 2848:10.1089/oli.1.1996.6.169 2531:10.1089/oli.1.1996.6.267 1762:Human Molecular Genetics 1327:10.1089/oli.1.1997.7.187 744:Heasman J (March 2002). 573:are past, with observed 19:Not to be confused with 3495:Genomic 2335:10.1074/jbc.M109.009928 1609:10.1196/annals.1359.012 1073:Neuromuscular Disorders 488:(at the donor site) or 350:organisms, pre-mRNA is 288:, African clawed frog ( 3598:Artificial chromosomes 3386:Small nucleolar 3085:Bioconjugate Chemistry 3050:Bioconjugate Chemistry 2775:Antisense Therapeutics 2554:Bioconjugate Chemistry 2224:Nucleic Acids Research 2126:Nucleic Acids Research 1928:Nucleic Acids Research 1525:10.1242/dev.128.8.1467 1453:10.1006/dbio.2000.9720 763:10.1006/dbio.2001.0565 619:central nervous system 462: 416:5'-untranslated region 411: 343: 35: 3391:Small Cajal Body RNAs 2392:10.1089/zeb.2008.0555 1489:10.1242/dev.128.3.365 1440:Developmental Biology 908:expression of concern 902:|...}} 900:expression of concern 877:expression of concern 750:Developmental Biology 726:Nucleic acid analogue 538:in-situ hybridization 500:, commonly excluding 460: 409: 341: 248:rings linked through 33: 3444:Subgenomic messenger 3359:Small interfering 3331:Transfer-messenger 3016:10.1128/JVI.02360-06 1271:Morpholino Oligomers 1040:10.1128/AAC.00069-07 953:Morpholino Oligomers 696:vascular endothelial 682:Delivery into adult 520:of RT-PCR products. 402:Blocking translation 183:Sarepta Therapeutics 98:nucleic acid analogs 3661:Genetics techniques 3004:Journal of Virology 2236:10.1093/nar/gks1044 2187:10.1261/rna.7810204 2091:10.1038/nature02844 2083:2004Natur.431..471Y 2038:10.1242/bio.2012810 1601:2005NYASA1058...62S 925:Moulton JD (2016). 675:and an ethoxylated 518:gel electrophoresis 75:molecular structure 44:Morpholino oligomer 3671:Molecular genetics 3473:Chloroplast 3316:modified Messenger 3279:Ribonucleic acids 2138:10.1093/nar/gni041 1940:10.1093/nar/gkh968 1816:10.1002/humu.20303 1775:10.1093/hmg/ddh272 1725:10.1093/jac/dkw476 463: 412: 344: 252:groups instead of 250:phosphorodiamidate 165:organisms such as 79:phosphorodiamidate 61:(colloquially, an 42:, also known as a 36: 3646: 3645: 3523:Xeno 3485:Complementary 3458:Deoxyribonucleic 3452: 3451: 3429:Small hairpin 3199:978-0-471-24662-6 3097:10.1021/bc8001437 3062:10.1021/bc070060v 2792:978-1-59259-854-0 2606:10.1002/gene.1038 2566:10.1021/bc060138s 2437:10.1002/dvg.20361 1660:10.2144/000113005 1563:10.1002/gene.1039 1288:978-1-4939-6817-6 970:978-1-4939-6815-2 807:10.1002/gene.1053 312:Morpholinos into 274:phosphorothioates 67:molecular biology 16:Chemical compound 3698: 3666:Phosphoramidates 3636: 3635: 3613:Yeast 3434:Small temporal 3364:Piwi-interacting 3292: 3291: 3288: 3269:Deoxynucleotides 3232: 3225: 3218: 3209: 3208: 3203: 3160: 3159: 3149: 3139: 3115: 3109: 3108: 3080: 3074: 3073: 3044: 3038: 3037: 3027: 2995: 2989: 2988: 2959: 2953: 2952: 2942: 2918: 2912: 2911: 2874: 2868: 2867: 2831: 2825: 2824: 2818: 2814: 2812: 2804: 2770: 2764: 2763: 2753: 2725: 2719: 2718: 2708: 2676: 2670: 2669: 2659: 2649: 2625: 2619: 2618: 2608: 2584: 2578: 2577: 2549: 2543: 2542: 2514: 2508: 2507: 2497: 2487: 2478:(10): e1007000. 2466:(October 2017). 2458: 2449: 2448: 2420: 2414: 2413: 2403: 2371: 2358: 2357: 2347: 2337: 2328:(30): 19982–92. 2313: 2307: 2306: 2296: 2264: 2258: 2257: 2247: 2215: 2209: 2208: 2198: 2166: 2160: 2159: 2149: 2117: 2111: 2110: 2066: 2060: 2059: 2049: 2017: 2011: 2010: 2000: 1968: 1962: 1961: 1951: 1919: 1913: 1912: 1902: 1878: 1872: 1871: 1843: 1837: 1836: 1818: 1794: 1788: 1787: 1777: 1753: 1747: 1746: 1736: 1704: 1698: 1697: 1695: 1694: 1679: 1673: 1672: 1662: 1638: 1629: 1628: 1584: 1575: 1574: 1546: 1537: 1536: 1507: 1501: 1500: 1472: 1466: 1465: 1455: 1431: 1425: 1424: 1388: 1382: 1381: 1353: 1347: 1346: 1310: 1301: 1300: 1266: 1260: 1259: 1211: 1205: 1204: 1156: 1150: 1149: 1147: 1146: 1131: 1125: 1124: 1111: 1105: 1104: 1079:(9–10): 583–90. 1068: 1062: 1061: 1051: 1019: 1010: 1009: 989: 983: 982: 948: 942: 941: 931: 922: 916: 915: 913: 911: 903: 873: 863: 853: 829: 820: 819: 809: 785: 776: 775: 765: 741: 677:polyethylenimine 482:splice enhancers 354:in the nucleus, 225:Morpholinos are 175:genetic diseases 87:reverse genetics 83:ribonucleic acid 54:), is a type of 3706: 3705: 3701: 3700: 3699: 3697: 3696: 3695: 3686:Gene expression 3651: 3650: 3647: 3642: 3624: 3565:Cloning vectors 3559: 3545:Locked 3509: 3459: 3448: 3407: 3335: 3282: 3281: 3273: 3242: 3236: 3206: 3200: 3168: 3166:Further reading 3163: 3116: 3112: 3081: 3077: 3045: 3041: 3010:(11): 5637–48. 2996: 2992: 2960: 2956: 2933:(10): 1686–91. 2919: 2915: 2892:10.1002/jgm.838 2875: 2871: 2832: 2828: 2816: 2815: 2806: 2805: 2793: 2771: 2767: 2726: 2722: 2677: 2673: 2626: 2622: 2585: 2581: 2550: 2546: 2515: 2511: 2459: 2452: 2421: 2417: 2372: 2361: 2314: 2310: 2265: 2261: 2216: 2212: 2181:(10): 1653–61. 2167: 2163: 2118: 2114: 2077:(7007): 471–6. 2067: 2063: 2018: 2014: 1977:Nature Genetics 1969: 1965: 1934:(21): 6284–91. 1920: 1916: 1879: 1875: 1844: 1840: 1795: 1791: 1768:(20): 2409–20. 1754: 1750: 1705: 1701: 1692: 1690: 1681: 1680: 1676: 1639: 1632: 1585: 1578: 1547: 1540: 1508: 1504: 1473: 1469: 1432: 1428: 1393:Nature Genetics 1389: 1385: 1354: 1350: 1311: 1304: 1289: 1267: 1263: 1212: 1208: 1171:(10): 627–639. 1157: 1153: 1144: 1142: 1132: 1128: 1113: 1112: 1108: 1069: 1065: 1020: 1013: 990: 986: 971: 949: 945: 929: 923: 919: 905: 897: 895: 874: 830: 823: 786: 779: 742: 738: 734: 717: 665:electroporation 652: 571:differentiation 554: 526: 455: 436:gene expression 404: 336: 334:Gene expression 330: 301:F. heteroclitus 298:and killifish ( 270: 223: 211: 128:model organisms 93:gene function. 71:gene expression 28: 17: 12: 11: 5: 3704: 3694: 3693: 3688: 3683: 3678: 3673: 3668: 3663: 3644: 3643: 3641: 3640: 3629: 3626: 3625: 3623: 3622: 3621: 3620: 3615: 3610: 3605: 3595: 3590: 3585: 3580: 3575: 3569: 3567: 3561: 3560: 3558: 3557: 3552: 3550:Peptide 3547: 3542: 3541: 3540: 3535: 3530: 3528:Glycol 3519: 3517: 3511: 3510: 3508: 3507: 3502: 3497: 3492: 3487: 3482: 3481: 3480: 3475: 3464: 3462: 3454: 3453: 3450: 3449: 3447: 3446: 3441: 3436: 3431: 3426: 3421: 3415: 3413: 3409: 3408: 3406: 3405: 3400: 3399: 3398: 3393: 3388: 3383: 3373: 3368: 3367: 3366: 3361: 3356: 3345: 3343: 3337: 3336: 3334: 3333: 3328: 3323: 3318: 3313: 3312: 3311: 3300: 3298: 3289: 3275: 3274: 3272: 3271: 3266: 3261: 3256: 3250: 3248: 3244: 3243: 3240:nucleic acids 3235: 3234: 3227: 3220: 3212: 3205: 3204: 3198: 3183: 3180: 3169: 3167: 3164: 3162: 3161: 3130:(3): 1304–23. 3110: 3091:(7): 1464–70. 3075: 3056:(4): 1325–31. 3039: 2990: 2954: 2913: 2869: 2826: 2817:|journal= 2791: 2765: 2720: 2671: 2620: 2579: 2544: 2509: 2450: 2415: 2359: 2308: 2273:Molecular Cell 2259: 2230:(2): 1113–23. 2210: 2161: 2112: 2061: 2012: 1989:10.1038/ng1953 1963: 1914: 1873: 1838: 1803:Human Mutation 1789: 1748: 1719:(3): 782–790. 1699: 1674: 1630: 1576: 1538: 1519:(8): 1467–79. 1502: 1467: 1426: 1383: 1348: 1302: 1287: 1261: 1226:(7): 875–879. 1206: 1165:Drugs of Today 1151: 1126: 1106: 1063: 1034:(7): 2470–82. 1011: 984: 969: 943: 917: 821: 777: 735: 733: 730: 729: 728: 723: 716: 713: 661:microinjection 651: 648: 553: 550: 525: 522: 454: 451: 403: 400: 329: 326: 269: 266: 222: 219: 210: 207: 159:pharmaceutical 112:Gene knockdown 15: 9: 6: 4: 3: 2: 3703: 3692: 3691:Biotechnology 3689: 3687: 3684: 3682: 3679: 3677: 3676:Nucleic acids 3674: 3672: 3669: 3667: 3664: 3662: 3659: 3658: 3656: 3649: 3639: 3631: 3630: 3627: 3619: 3616: 3614: 3611: 3609: 3606: 3604: 3601: 3600: 3599: 3596: 3594: 3591: 3589: 3586: 3584: 3581: 3579: 3576: 3574: 3571: 3570: 3568: 3566: 3562: 3556: 3553: 3551: 3548: 3546: 3543: 3539: 3536: 3534: 3533:Threose 3531: 3529: 3526: 3525: 3524: 3521: 3520: 3518: 3516: 3512: 3506: 3503: 3501: 3498: 3496: 3493: 3491: 3490:Deoxyribozyme 3488: 3486: 3483: 3479: 3478:Mitochondrial 3476: 3474: 3471: 3470: 3469: 3466: 3465: 3463: 3461: 3455: 3445: 3442: 3440: 3437: 3435: 3432: 3430: 3427: 3425: 3422: 3420: 3417: 3416: 3414: 3410: 3404: 3401: 3397: 3394: 3392: 3389: 3387: 3384: 3382: 3379: 3378: 3377: 3374: 3372: 3369: 3365: 3362: 3360: 3357: 3355: 3352: 3351: 3350: 3347: 3346: 3344: 3342: 3338: 3332: 3329: 3327: 3324: 3322: 3319: 3317: 3314: 3310: 3307: 3306: 3305: 3302: 3301: 3299: 3297: 3296:Translational 3293: 3290: 3286: 3280: 3276: 3270: 3267: 3265: 3262: 3260: 3257: 3255: 3252: 3251: 3249: 3245: 3241: 3233: 3228: 3226: 3221: 3219: 3214: 3213: 3210: 3201: 3195: 3191: 3190: 3184: 3181: 3178: 3174: 3171: 3170: 3157: 3153: 3148: 3143: 3138: 3133: 3129: 3125: 3121: 3114: 3106: 3102: 3098: 3094: 3090: 3086: 3079: 3071: 3067: 3063: 3059: 3055: 3051: 3043: 3035: 3031: 3026: 3021: 3017: 3013: 3009: 3005: 3001: 2994: 2986: 2982: 2978: 2974: 2971:(3): 304–13. 2970: 2966: 2958: 2950: 2946: 2941: 2936: 2932: 2928: 2924: 2917: 2909: 2905: 2901: 2897: 2893: 2889: 2886:(2): 207–16. 2885: 2881: 2873: 2865: 2861: 2857: 2853: 2849: 2845: 2842:(3): 169–75. 2841: 2837: 2830: 2822: 2810: 2802: 2798: 2794: 2788: 2784: 2780: 2776: 2769: 2761: 2757: 2752: 2747: 2743: 2739: 2736:(3): 207–11. 2735: 2731: 2724: 2716: 2712: 2707: 2702: 2698: 2694: 2690: 2686: 2682: 2675: 2667: 2663: 2658: 2653: 2648: 2643: 2639: 2635: 2634:PLOS Genetics 2631: 2624: 2616: 2612: 2607: 2602: 2598: 2594: 2590: 2583: 2575: 2571: 2567: 2563: 2559: 2555: 2548: 2540: 2536: 2532: 2528: 2525:(4): 267–72. 2524: 2520: 2513: 2505: 2501: 2496: 2491: 2486: 2481: 2477: 2473: 2472:PLOS Genetics 2469: 2465: 2457: 2455: 2446: 2442: 2438: 2434: 2430: 2426: 2419: 2411: 2407: 2402: 2397: 2393: 2389: 2385: 2381: 2377: 2370: 2368: 2366: 2364: 2355: 2351: 2346: 2341: 2336: 2331: 2327: 2323: 2319: 2312: 2304: 2300: 2295: 2290: 2286: 2282: 2279:(6): 927–39. 2278: 2274: 2270: 2263: 2255: 2251: 2246: 2241: 2237: 2233: 2229: 2225: 2221: 2214: 2206: 2202: 2197: 2192: 2188: 2184: 2180: 2176: 2172: 2165: 2157: 2153: 2148: 2143: 2139: 2135: 2131: 2127: 2123: 2116: 2108: 2104: 2100: 2096: 2092: 2088: 2084: 2080: 2076: 2072: 2065: 2057: 2053: 2048: 2043: 2039: 2035: 2031: 2027: 2023: 2016: 2008: 2004: 1999: 1994: 1990: 1986: 1983:(2): 259–63. 1982: 1978: 1974: 1967: 1959: 1955: 1950: 1945: 1941: 1937: 1933: 1929: 1925: 1918: 1910: 1906: 1901: 1896: 1893:(4): 718–29. 1892: 1888: 1884: 1877: 1869: 1865: 1861: 1857: 1853: 1849: 1842: 1834: 1830: 1826: 1822: 1817: 1812: 1808: 1804: 1800: 1793: 1785: 1781: 1776: 1771: 1767: 1763: 1759: 1752: 1744: 1740: 1735: 1730: 1726: 1722: 1718: 1714: 1710: 1703: 1688: 1684: 1678: 1670: 1666: 1661: 1656: 1652: 1648: 1647:BioTechniques 1644: 1637: 1635: 1626: 1622: 1618: 1614: 1610: 1606: 1602: 1598: 1594: 1590: 1583: 1581: 1572: 1568: 1564: 1560: 1557:(3): 94–102. 1556: 1552: 1545: 1543: 1534: 1530: 1526: 1522: 1518: 1514: 1506: 1498: 1494: 1490: 1486: 1483:(3): 365–75. 1482: 1478: 1471: 1463: 1459: 1454: 1449: 1446:(1): 124–34. 1445: 1441: 1437: 1430: 1422: 1418: 1414: 1410: 1406: 1405:10.1038/79951 1402: 1399:(2): 216–20. 1398: 1394: 1387: 1379: 1375: 1371: 1367: 1364:(1): 141–58. 1363: 1359: 1352: 1344: 1340: 1336: 1332: 1328: 1324: 1321:(3): 187–95. 1320: 1316: 1309: 1307: 1298: 1294: 1290: 1284: 1280: 1276: 1272: 1265: 1257: 1253: 1249: 1245: 1241: 1237: 1233: 1229: 1225: 1221: 1217: 1210: 1202: 1198: 1194: 1190: 1186: 1182: 1178: 1174: 1170: 1166: 1162: 1155: 1141: 1137: 1130: 1123:. 2019-09-10. 1122: 1121: 1116: 1110: 1102: 1098: 1094: 1090: 1086: 1082: 1078: 1074: 1067: 1059: 1055: 1050: 1045: 1041: 1037: 1033: 1029: 1025: 1018: 1016: 1007: 1003: 1000:(2): 109–13. 999: 995: 988: 980: 976: 972: 966: 962: 958: 954: 947: 939: 935: 928: 921: 909: 901: 894: 890: 886: 882: 878: 871: 867: 862: 857: 852: 847: 843: 839: 835: 828: 826: 817: 813: 808: 803: 799: 795: 791: 784: 782: 773: 769: 764: 759: 756:(2): 209–14. 755: 751: 747: 740: 736: 727: 724: 722: 719: 718: 712: 709: 705: 701: 697: 693: 689: 685: 680: 678: 674: 670: 666: 662: 657: 656:cell membrane 647: 644: 639: 636: 632: 628: 624: 620: 616: 611: 609: 604: 600: 597: 596:coding region 593: 588: 583: 580: 576: 572: 568: 567:organogenesis 563: 559: 549: 547: 543: 539: 535: 531: 521: 519: 515: 511: 507: 503: 499: 495: 491: 487: 483: 479: 476: 472: 468: 459: 450: 448: 443: 441: 437: 433: 432:knocking down 429: 425: 421: 417: 414:Bound to the 408: 399: 397: 393: 389: 385: 381: 377: 373: 369: 365: 361: 357: 353: 349: 340: 335: 325: 323: 319: 315: 311: 310:electroporate 307: 303: 302: 297: 293: 292: 287: 283: 279: 275: 265: 263: 259: 255: 251: 247: 243: 239: 235: 231: 228: 218: 216: 206: 204: 200: 196: 192: 188: 184: 180: 176: 172: 168: 164: 160: 155: 153: 149: 145: 141: 137: 133: 129: 125: 122: 118: 113: 109: 107: 103: 99: 94: 92: 91:knocking down 88: 84: 80: 76: 72: 68: 64: 60: 57: 53: 49: 45: 41: 32: 26: 22: 3648: 3608:Bacterial 3583:Lambda phage 3554: 3247:Constituents 3188: 3176: 3127: 3123: 3113: 3088: 3084: 3078: 3053: 3049: 3042: 3007: 3003: 2993: 2968: 2964: 2957: 2930: 2926: 2916: 2883: 2879: 2872: 2839: 2835: 2829: 2774: 2768: 2751:10533/178089 2733: 2729: 2723: 2697:10.3791/1115 2688: 2684: 2674: 2637: 2633: 2623: 2599:(3): 89–93. 2596: 2592: 2582: 2560:(1): 50–60. 2557: 2553: 2547: 2522: 2518: 2512: 2475: 2471: 2428: 2424: 2418: 2386:(1): 69–77. 2383: 2379: 2325: 2321: 2311: 2276: 2272: 2262: 2227: 2223: 2213: 2178: 2174: 2164: 2129: 2125: 2115: 2074: 2070: 2064: 2032:(6): 566–9. 2029: 2026:Biology Open 2025: 2015: 1980: 1976: 1966: 1931: 1927: 1917: 1890: 1886: 1876: 1854:(2): 521–7. 1851: 1847: 1841: 1809:(5): 420–6. 1806: 1802: 1792: 1765: 1761: 1751: 1716: 1712: 1702: 1691:. 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Index

morpholine
morphine

oligomer
molecule
molecular biology
gene expression
molecular structure
phosphorodiamidate
ribonucleic acid
reverse genetics
knocking down
nucleic acid analogs
morpholine
trade name
Gene knockdown
exon
moiety
encoded
model organisms
mice
zebrafish
frogs
sea urchins
splicing
pre-mRNA
pharmaceutical
pathogenic
bacteria
viruses

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