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. 1995 Mar 25;23(6):954–961. doi: 10.1093/nar/23.6.954

Single base discrimination for ribonuclease H-dependent antisense effects within intact human leukaemia cells.

R V Giles 1, C J Ruddell 1, D G Spiller 1, J A Green 1, D M Tidd 1
PMCID: PMC306791  PMID: 7731809

Abstract

We have previously demonstrated, in vitro, that phosphodiester and phosphorothioate antisense oligodeoxynucleotides could direct ribonuclease H to cleave non-target RNA sites and that chimeric methylphosphonodiester/phosphodiester analogue structures were substantially more specific. In this report we show that such chimeric molecules can promote point mutation-specific scission of target mRNA by both Escherichia coli and human RNases H in vitro. Intact human leukaemia cells 'biochemically microinjected' with antisense effectors demonstrated efficient suppression of target mRNA expression. It was noted that the chimeric methylphosphonodiester/phosphodiester structures showed single base discrimination, whereas neither the phosphodiester nor phosphorothioate compounds were as stringent. Finally, we show that the antisense effects obtained in intact cells were due to endogenous RNase H activity.

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Selected References

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