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Is irrelevant cleavage the price of antisense efficacy?

Identifieur interne : 000530 ( Istex/Corpus ); précédent : 000529; suivant : 000531

Is irrelevant cleavage the price of antisense efficacy?

Auteurs : C. A Stein

Source :

RBID : ISTEX:C0170D2A7FD2FFAF32FE134230B031C38BB09102

English descriptors

Abstract

Abstract: Antisense oligonucleotides are useful reagents for the suppression of gene expression. Their mechanism of action in eukaryotic cells appears to depend heavily on the activity of RNase H, a ubiquitous enzyme that cleaves the mRNA strand of an RNA-DNA duplex. However, the stringency requirements of RNase H are very low, and as little as a 5-base complementary region of oligomer to target may be sufficient to elicit RNase H activity. This would result in scission of nontargeted mRNAs, or what is known as “irrelevant cleavage.” One strategy to reduce RNase H competency that has been employed is modification of the oligonucleotide backbone, replacing phosphodiester linkages with uncharged methylphosphonates, which are not RNase H competent. Another strategy involves replacement of deoxyribonucleic acid with 2′-O-alkylribonucleic acid. A third strategy, eliminating RNase H dependency entirely, requires activation of RNase P. The relative merits of these strategies will be discussed in the context of selective inhibition of gene function.

Url:
DOI: 10.1016/S0163-7258(99)00053-4

Links to Exploration step

ISTEX:C0170D2A7FD2FFAF32FE134230B031C38BB09102

Le document en format XML

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<affiliation>Tel.: 212-305-3606; fax: 212-305-7348.(C.A. Stein)</affiliation>
<affiliation>E-mail: stein@cuccfa.ccc.columbia.edu</affiliation>
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<abstract lang="en">Abstract: Antisense oligonucleotides are useful reagents for the suppression of gene expression. Their mechanism of action in eukaryotic cells appears to depend heavily on the activity of RNase H, a ubiquitous enzyme that cleaves the mRNA strand of an RNA-DNA duplex. However, the stringency requirements of RNase H are very low, and as little as a 5-base complementary region of oligomer to target may be sufficient to elicit RNase H activity. This would result in scission of nontargeted mRNAs, or what is known as “irrelevant cleavage.” One strategy to reduce RNase H competency that has been employed is modification of the oligonucleotide backbone, replacing phosphodiester linkages with uncharged methylphosphonates, which are not RNase H competent. Another strategy involves replacement of deoxyribonucleic acid with 2′-O-alkylribonucleic acid. A third strategy, eliminating RNase H dependency entirely, requires activation of RNase P. The relative merits of these strategies will be discussed in the context of selective inhibition of gene function.</abstract>
<note type="content">Section title: Review article</note>
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<genre>Keywords</genre>
<topic>Antisense oligonucleotides</topic>
<topic>RNase H</topic>
<topic>Irrelevant cleavage</topic>
<topic>Backbone modifications</topic>
</subject>
<subject>
<genre>Abbreviations</genre>
<topic>EGS, external guide sequence</topic>
<topic>PKC, protein kinase C</topic>
<topic>Tm, melting temperature</topic>
<topic>tRNA, transfer RNA</topic>
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<identifier type="ISSN">0163-7258</identifier>
<identifier type="PII">S0163-7258(00)X0058-7</identifier>
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<date>2000</date>
<detail type="volume">
<number>85</number>
<caption>vol.</caption>
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<number>3</number>
<caption>no.</caption>
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<start>111</start>
<end>276</end>
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<identifier type="DOI">10.1016/S0163-7258(99)00053-4</identifier>
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<accessCondition type="use and reproduction" contentType="copyright">©2000 Elsevier Science Inc.</accessCondition>
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