Transgene-free plant genome editing via viral delivery of miniature CRISPR-Cas12f.
Awan MJA, Akram A, Naqvi RZ, Akhtar M, Siddique S
Crispr
Crops edited this way leave no trace of foreign DNA — meaning a disease-resistant tomato or blight-tolerant potato developed with this method could sidestep the regulatory and public perception hurdles that have slowed GM crop adoption for decades.
Researchers figured out how to hitch a tiny gene-editing scissors onto a common plant virus, letting it ride through an entire plant and snip a specific piece of DNA. Because the virus does its job and then disappears, the resulting plant has no permanent foreign material in it — it's essentially indistinguishable from a naturally mutated plant. This could make it far cheaper and faster to breed crops that resist disease, drought, or pests.
Key Findings
A miniaturized CRISPR tool (Cas12f) was successfully packaged into Tobacco Rattle Virus and delivered to Nicotiana benthamiana plants, producing visible gene knockouts confirmed by persistent leaf bleaching and DNA sequencing.
Fusing the CRISPR components with a transfer RNA (tRNA) tag and using the Pea early browning virus (PeBV) promoter yielded the highest editing efficiency among all tested configurations.
The entire system is transgene-free — no foreign DNA remains stably integrated in the edited plant — and bypasses tissue culture, a major cost and time bottleneck in conventional crop genetic engineering.
chevron_right Technical Summary
Scientists used a plant virus to deliver a miniature gene-editing tool (CRISPR) directly into living plants, successfully editing their DNA without leaving behind any foreign genes. This approach skips the expensive, time-consuming lab tissue culture step normally required to create edited crops.
Abstract Preview
Efficient delivery of CRISPR reagents into plant cells remains a major bottleneck, particularly for transgene-free genome editing. RNA viral vectors such as Tabacco Rattle Virus (TRV) provide an at...
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