RNA Beacon Supercharges CRISPR for Cleaner Plant Gene Editing

The CRISPR/Cas9 system has revolutionised plant genetics, but a significant bottleneck remains: finding plants that have been successfully edited while also being free of the editing machinery. This screening process is often complex and time-consuming.

Now, researchers have developed an elegant solution called 3WJ-4 × Bro/Cas9. Instead of using traditional fluorescent proteins as markers—which can sometimes interfere with the editing process—this new system employs a specially engineered RNA structure, known as an RNA aptamer. This aptamer acts as a subtle transcriptional reporter, a biological indicator that flags the presence of the Cas9 system without disrupting its behaviour.

The results are striking. Compared to older methods, the new system boosted the initial mutation rate by 78.6% and improved the efficiency of sorting for Cas9-free plants by 30.2% in the next generation. This approach offers a more efficient and broadly applicable strategy for advancing plant genome editing, without negatively affecting the plants' growth.