Transposase-Assisted Donor Tethering Boosts Large-Fragment HDR in Plants.
Wei S, Zhang K, Deng S, Chen J, Huang X
Crispr
Crops engineered to resist drought, disease, or pests with large genetic upgrades — things that have been technically possible but frustratingly unreliable — just got a lot closer to reality for the plants that feed you.
CRISPR lets scientists cut plant DNA at a precise spot, but getting a large useful piece of new DNA to actually slot in there has been extremely hit-or-miss. This new method acts like a molecular courier, physically ferrying the replacement DNA directly to the cut site so the plant's own repair machinery can stitch it in correctly. The technique worked in both broad-leaved plants (like most vegetables and flowers) and grass-family plants (like wheat and rice), making it broadly applicable to agriculture.
Key Findings
Fusing a DNA-binding transposase protein to the Cas9 editing tool physically co-localizes donor DNA with the cut site, improving insertion reliability over conventional delivery methods.
Combining donor tethering with a transcription-coupled donor template and a repair-pathway-biased Cas9 variant synergistically enhanced large-fragment insertion frequency.
The system achieved efficient kilobase-scale (1,000+ base pair) targeted gene insertions across multiple genomic locations in both dicot and monocot plant species.
chevron_right Technical Summary
Scientists developed a new technique that dramatically improves the reliability of inserting large DNA sequences into plant genomes using CRISPR gene editing. By physically escorting donor DNA directly to the editing site, precise large-scale genetic changes become far more achievable across many plant types.
Abstract Preview
Precise insertion of large DNA fragments by homology-directed repair (HDR) remains inefficient and poorly reproducible in plants, largely due to limited donor availability at double-strand break si...
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