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Updated: Aug 8, 2026
09:24
Silencing of BRCA2 to Identify Novel BRCA2-regulated Biological Functions in Cultured Human Cells
Published on: August 12, 2015
2'-deoxy-2'-fluoro-beta-D-arabinonucleic acid (2'F-ANA) modified oligonucleotides (ON) effect highly efficient, and
A Kalota1, L Karabon, C R Swider
1University of Pennsylvania School of Medicine, Philadelphia, PA, USA.
Nucleic Acids Research
|January 20, 2006
Summary
New antisense oligonucleotides (AS ON) with 2'F-ANA modifications show enhanced gene silencing. These AS ONs are more potent and longer-lasting than traditional AS ONs, suggesting therapeutic potential.
Area of Science:
- Molecular Biology
- Oligonucleotide Chemistry
- Gene Silencing
Background:
- Antisense oligonucleotides (AS ON) require nuclease resistance, stable duplex formation, and efficient cleavage for in vivo efficacy.
- Achieving prolonged gene silencing with minimal off-target effects remains a challenge for AS ON technology.
Purpose of the Study:
- To evaluate the efficacy of 2 F-ANA modified AS ONs for gene silencing.
- To compare the gene silencing efficiency and duration of 2 F-ANA-DNA chimeras with unmodified DNA AS ONs targeting c-MYB mRNA.
Main Methods:
- Synthesis of fully phosphorothioated 2 F-ANA-DNA chimeras (PS-2 FANA-DNA) and unmodified DNA AS ONs (PS-DNA).
- Delivery of AS ONs via nucleofection into human leukemia cells.
- Quantification of c-MYB mRNA and protein knockdown and assessment of silencing duration.
Main Results:
- Both PS-2 FANA-DNA and PS-DNA AS ONs achieved >90% knockdown of c-MYB mRNA and protein.
- PS-2 FANA-DNA chimeras were effective at 20% of the dose required for PS-DNA.
- Silencing effect of PS-2 FANA-DNA persisted for 4 days after a single administration, unlike PS-DNA.
Conclusions:
- PS-2 FANA-DNA chimeras demonstrate superior gene silencing efficiency and duration compared to unmodified DNA AS ONs.
- The 2 F-ANA modification enhances intracellular concentration and prolongs gene silencing effects.
- PS-2 FANA-DNA chimeras show significant therapeutic potential for gene silencing applications.
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