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RNA is becoming an important therapeutic target. Many potential RNA targets require secondary or tertiary structure for function. Examples include ribosomal RNAs, RNase P RNAs, mRNAs with untranslated regions that regulate translation, and group I and group II introns. Here, a method is described to inhibit RNA function by exploiting the propensity of RNA to adopt multiple folded states that are of similar free energy. This method, called oligonucleotide directed misfolding of RNA (ODMiR), uses short oligonucleotides to stabilize inactive structures. The ODMiR method is demonstrated with the group I intron from Candida albicans, a human pathogen. The oligonucleotides, (L)(TACCTTTC) and T(L)CT(L)AC(L)GA(L)CG(L)GC(L)C, with L denoting a locked nucleic acid residue, inhibit 50% of group I intron splicing in a transcription mixture at about 150 and 30 nM oligonucleotide concentration, respectively. Both oligonucleotides induce misfolds as determined by native gel electrophoresis and diethyl pyrocarbonate modification. The ODMiR approach provides a potential therapeutic strategy applicable to RNAs with secondary or tertiary structures required for function.

Oligonucleotide directed misfolding of RNA inhibits Candida albicans group I intron splicing