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Triplex-forming oligonucleotides (TFOs) are generally designed to inhibit transcription or DNA replication but can be used for more diverse purposes. Here we have designed a chimera peptide-TFO able to activate transcription from a target gene. The designed hybrid molecule contains a triplex-forming sequence, linked through a phosphoroamidate bond to several minimal transcriptional activation domains derived from Herpes simplex virus protein 16 (VP16). We show here that this TFO-peptide chimera (TFO-P) can specifically recognise its DNA target at physiological salt and pH conditions. Bound to the double-stranded target DNA in a promoter region, the TFO-P is able to activate gene expression. Our results suggest that this type of molecule may prove useful in the design of new tools for artificial modulation of gene expression.

Gene activation by triplex-forming oligonucleotide coupled to the activating domain of protein VP16