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TAG-RNAi overcomes off-target effects in cancer models

Abstract : RNA interference offers therapeutic opportunities for the clinical targeting of otherwise undruggable oncogenes. However RNAi can have off-target effects that considerably increase treatment risks. To manage these side effects and allow an easy subtraction of their activity in healthy tissues, we present here the TAG-RNAi approach where cells that are not designated targets do not have the mRNA tag. Using TAG-RNAi we first established the off-target signatures of three different siRNAs specific to the Cyclin D1 oncogene by RNA-sequencing of cultured cancer cells expressing a FLAG-HA-tagged-Cyclin D1. Then, by symmetrical allografts of tagged-cancer cells and untagged controls on the left and right flanks of model mice, we demonstrate that TAG-RNAi is a reliable approach to study the functional impact of any oncogene without off-target bias. Finally we show, as examples, that mutation-specific TAG-RNAi can be applied to downregulate two oncogenic mutants, KRAS-G12V or BRAF-V600E, while sparing the expression of the wild-type proteins. TAG-RNAi will thus avoid the traditional off-target limitations of RNAi in future experimental approaches.
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Contributor : Laetitia Linares <>
Submitted on : Monday, February 3, 2020 - 5:00:02 PM
Last modification on : Tuesday, June 2, 2020 - 2:20:10 PM




Julien Champagne, Laetitia Linares, Benjamin Maurel, Alexandre Zampieri, Maeva Moreno, et al.. TAG-RNAi overcomes off-target effects in cancer models. Oncogene, Nature Publishing Group, 2020, 39 (4), pp.935-945. ⟨10.1038/s41388-019-1020-2⟩. ⟨inserm-02465181⟩



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