Selective inhibition of mutant Ha-ras mRNA expression by antisense oligonucleotides.

作者: B.P. Monia , J.F. Johnston , D.J. Ecker , M.A. Zounes , W.F. Lima

DOI: 10.1016/S0021-9258(19)88650-7

关键词: DNAReporter geneOligonucleotideNucleic acid thermodynamicsMolecular biologyWild typeMutantMutationPoint mutationBiology

摘要: A biological reporter gene assay was employed to determine the crucial parameters for maximizing selective targeting of a Ha-ras codon 12 point mutation (G----T) using phosphorothioate antisense oligonucleotides. We have tested series oligonucleotides ranging in length between 5 and 25 bases, each centered around mutation. Our results indicate that this can be achieved with oligonucleotides, but selectivity is critically dependent upon oligonucleotide concentration. The maximum observed experiments, 5-fold 17-base oligonucleotide, closely predicted by simple thermodynamic model relates fraction mutant wild type target bound as function concentration affinity. These suggest analysis oligonucleotide/target interactions useful predicting specificity an targeted single base

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