Non-ROR1 messenger RNA with partial complementarity to the shROR1 guide strand

Non-ROR1 messenger RNAs with partial complementarity to the shROR1 guide strand refers to a collection of transcripts that are unintentionally silenced by short hairpin RNAs (shRNAs) designed to target the ROR1 (Receptor tyrosine kinase-like orphan receptor 1) gene. This off-target effect is primarily driven by the "seed sequence" of the shRNA, which consists of nucleotides 2 through 7 or 8 of the guide strand. These sequences can bind with partial complementarity to the 3' untranslated regions (UTRs) of various essential genes, leading to their degradation or translational repression (Putzbach et al., 2017, eLife). The broad silencing of these essential survival genes triggers a potent form of cell death known as Death Induced by Survival gene Elimination (DISE) (Gao et al., 2018, Nature Communications). In the context of oncology research, this phenomenon has caused significant confusion, as the cell death observed upon ROR1 knockdown was often mistakenly attributed to the loss of ROR1 itself rather than these off-target effects. This highlights a major challenge in RNA interference (RNAi) therapeutics, where the specificity of the guide strand is paramount to avoiding unintended toxicity. These mRNAs are not therapeutic targets in the traditional sense but are critical factors in understanding the safety profile and mechanism of action of RNAi-based tools and drugs. Consequently, researchers must employ rigorous controls, such as C911 controls or multiple independent sequences, to distinguish between true target-mediated effects and DISE-mediated off-target toxicity.

Other names

DISE-associated mRNAsshRNA off-target transcripts6mer seed toxicity targetsOff-target survival gene mRNAs

RNA interference-mediated gene silencing via seed-sequence complementarity in the 3' UTR