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2'-O-[2-[N,N-(dialkyl)aminooxy]ethyl]-modified antisense oligonucleotides
T P Prakash1, M Manoharan, A M Kawasaki
1Department of Medicinal Chemistry, Isis Pharmaceuticals Inc., 2292 Faraday Avenue, Carlsbad, California 92008, USA.
Organic Letters
|December 12, 2000
Summary
Novel oligonucleotide modifications, 2'-O-DMAOE and 2'-O-DEAOE, show high RNA binding affinity and significantly enhance nuclease stability, offering potential for therapeutic applications.
Area of Science:
- Medicinal Chemistry
- Nucleic Acid Chemistry
Background:
- Oligonucleotides are crucial in therapeutics but face challenges like nuclease degradation and off-target binding.
- Developing chemically modified oligonucleotides is key to improving their stability and specificity.
Purpose of the Study:
- To synthesize and characterize novel 2'-O-aminooxyethyl modifications for oligonucleotides.
- To evaluate the RNA binding affinity and nuclease stability of these modified oligonucleotides.
Main Methods:
- Chemical synthesis of oligonucleotides incorporating 2'-O-DMAOE and 2'-O-DEAOE modifications.
- Assessment of binding affinity to RNA and DNA targets using hybridization assays.
- Evaluation of nuclease resistance by measuring half-life (t(1/2)) in biological matrices.
Main Results:
- The novel 2'-O-DMAOE and 2'-O-DEAOE modifications were successfully synthesized.
- Modified oligonucleotides demonstrated high binding affinity specifically to target RNA, not DNA.
- Oligonucleotides with these modifications exhibited significantly enhanced nuclease stability, with a half-life exceeding 24 hours as phosphodiesters.
Conclusions:
- The 2'-O-DMAOE and 2'-O-DEAOE modifications represent promising advancements in oligonucleotide chemistry.
- These modifications enhance both target RNA binding specificity and nuclease resistance, crucial for therapeutic oligonucleotide development.