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Oxetane modified, conformationally constrained, antisense oligodeoxyribonucleotides function efficiently as gene
J B Opalinska1, A Kalota, Lida K Gifford
1Division of Hematology/Oncology, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA, USA.
Nucleic Acids Research
|October 30, 2004
Summary
Novel oxetane (OXE) modified antisense oligodeoxyribonucleotides (ODNs) demonstrate potent gene silencing. Rationally targeted OXE ODNs show enhanced efficiency for potential therapeutic applications.
Area of Science:
- Oligonucleotide chemistry
- Molecular biology
- Antisense technology
Background:
- Antisense oligodeoxyribonucleotides (ODNs) are investigated for gene silencing.
- Novel oxetane (OXE) modifications enhance ODN properties like nuclease resistance and RNase H activity.
- Improving delivery and efficiency of ODNs is crucial for therapeutic applications.
Purpose of the Study:
- To evaluate the gene silencing efficiency of OXE-modified ODNs compared to phosphorothioate (PS) ODNs.
- To assess the impact of rational targeting based on hybridization accessibility.
- To determine the potential of OXE ODNs for therapeutic gene silencing.
Main Methods:
- Incorporation of OXE-modified nucleosides into antisense ODNs.
- Direct comparison of OXE and PS ODNs in living cells targeting c-myb gene expression.
- Rational targeting strategy using self-quenching reporter molecules (SQRM) for mRNA accessibility prediction.
Main Results:
- Both OXE and PS ODNs equally reduced Myb mRNA and protein levels.
- OXE ODNs showed higher potency on a molar basis, despite lower cellular delivery efficiency compared to PS ODNs.
- Rationally targeted OXE ODNs exhibited greater silencing efficiency than arbitrarily targeted ones.
Conclusions:
- Rationally targeted OXE-modified ODNs are efficient gene silencing agents.
- OXE ODNs demonstrate potent activity and potential for therapeutic use.
- Optimized targeting strategies enhance the efficacy of modified ODNs.