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Selecting effective antisense reagents on combinatorial oligonucleotide arrays

N Milner1, K U Mir, E M Southern

  • 1Department of Biochemistry, University of Oxford, UK.

Nature Biotechnology
|June 1, 1997
PubMed
Summary
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Oligonucleotide scanning arrays: application to high-throughput screening for effective antisense reagents and the study of nucleic acid interactions.

Advances in biochemical engineering/biotechnology·2002

Selecting effective antisense oligonucleotides is challenging. This study developed an array method to empirically screen oligodeoxynucleotides (ONs) for heteroduplex formation with mRNA, improving antisense therapy selection.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Antisense oligonucleotides (ASOs) offer therapeutic potential but their efficacy varies.
  • Predicting effective ASOs based on sequence or structure alone is difficult.
  • Understanding heteroduplex formation is key to ASO design.

Purpose of the Study:

  • To develop an array-based method for empirical screening of ASOs.
  • To correlate heteroduplex formation with antisense activity.
  • To identify factors influencing ASO efficacy.

Main Methods:

  • Fabrication of a high-density array of 1,938 oligodeoxynucleotides (ONs).
  • Measurement of heteroduplex formation between ONs and rabbit beta-globin mRNA.
  • Assessment of antisense activity using RNase H assays and in vitro translation.

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Main Results:

  • Only a small fraction of ONs yielded significant heteroduplex formation.
  • Heteroduplex yield strongly correlated with antisense activity (RNase H and translation inhibition).
  • An optimal ON required five times less concentration for 50% translation inhibition compared to others.

Conclusions:

  • ASO efficacy is empirically predictable via heteroduplex formation on arrays.
  • No clear sequence or structural features explain variable heteroduplex yield.
  • This array method provides a robust approach for selecting effective ASOs for any RNA target.