CRISPR-Mediated Intronic Knockin of Pre-amiRNA Enables Targeted Gene Silencing.
Dong J, Zhang K, Song M, Xiao M, Lu X
Crispr
Breeding a crop — or even an ornamental — that resists a specific disease without carrying foreign genes into every future generation just moved a step closer, because this technique lets breeders flip a single gene's switch in exactly the right tissue, then step back cleanly.
Scientists found a clever way to use CRISPR, the gene-editing tool, to turn off specific genes inside a plant by hiding tiny silencing instructions in the 'junk' sections of the plant's own DNA. Because those instructions borrow the plant's natural machinery to do the work, they activate only in certain parts of the plant — a leaf but not a root, for example — and don't stick around as permanent foreign additions. The technique could help researchers quickly figure out what individual plant genes actually do, and help breeders develop disease-resistant varieties with a lighter regulatory footprint.
Key Findings
Inserting artificial microRNA precursors into plant gene introns via CRISPR/Cas9 successfully silenced target genes in a tissue-specific manner.
The approach avoids persistent transgene expression, meaning the editing instructions don't remain as heritable foreign sequences passed to future plant generations.
By piggybacking on the plant's existing microRNA processing system, the method achieves precise, endogenous-style gene regulation rather than relying on blunt over-expression of silencing constructs.
chevron_right Technical Summary
Scientists used CRISPR gene editing to silence specific plant genes by tucking tiny genetic instructions into the plant's own non-coding DNA regions — a technique that works in targeted tissues and leaves no lasting foreign DNA behind. This advance could streamline both crop breeding and the study of how individual plant genes function.
Abstract Preview
We developed an intronic artificial microRNA (IamiRNA) strategy that combines CRISPR/Cas9-mediated knock-in with endogenous miRNA processing for plant gene silencing. By inserting amiRNA precursors...
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