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. 1995 Apr 11;23(7):1146–1151. doi: 10.1093/nar/23.7.1146

Sequence context of antisense RelA/NF-kappa B phosphorothioates determines specificity.

J Y Maltese 1, H W Sharma 1, L Vassilev 1, R Narayanan 1
PMCID: PMC306823  PMID: 7739892

Abstract

The use of antisense oligomers to achieve inhibition of gene expression is complicated by frequent non-specific effects, and even the control oligomers often exhibit sequence-specific effects. We have recently shown that in diverse tumor-derived cell lines, a 24mer phosphorothioate oligomer antisense to the relA subunit of NF-kappa B transcription factor causes a block of cellular adhesion, inhibition of nuclear NF-kappa B and Sp1 DNA-binding activity and inhibition of tumor cell growth in vitro and in vivo. In this study we use the same model to attempt to define the limits of antisense specificity. We demonstrate that single base pair substitution can virtually abolish the antisense activity. The relative position of mismatches within the antisense sequence is critical to the loss of activity. Our results further indicate that antisense specificity is determined not only by the content of the sequence but also by its occurrence with reference to the surrounding sequences.

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Selected References

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