Plant enzymes measure RNA twice to pick gene targets precisely
Zhang Z, Wang C, Wang Q, Li S, Du J
Plant Signaling
The precise, almost surgical way plants fine-tune their own genes through these RNA-cutting enzymes is part of why breeders can engineer disease resistance or stress tolerance into crops and ornamentals without introducing foreign DNA.
Every plant cell has molecular scissors called DICER-LIKE proteins that snip long RNA strands into short pieces used to turn genes on or off. Scientists found that plants evolved extra copies of these scissors compared to animals, and that plant versions are pickier: they measure both the RNA they're about to cut and the pieces they produce, like a ruler used twice instead of once. That double-checking lets plants make many different kinds of tiny RNA signals for different jobs, from fighting viruses to controlling growth.
Key Findings
Seed plants possess a greatly expanded DICER-LIKE (DCL) protein family compared to the fewer Dicer proteins found in animals
Plant DCLs act as molecular rulers for product RNA length, similar to animal Dicers, but also measure substrate RNA before cutting
This dual substrate-and-product measurement allows plant DCLs to generate multiple sRNA types (miRNA and siRNA) with distinct lengths, structures, and functions
chevron_right Technical Summary
Plants use specialized enzymes called Dicers to chop up RNA into tiny regulatory pieces that control gene activity. This review shows that unlike in animals, plant Dicers don't just measure the length of the final RNA product, they also measure the starting RNA to pick the right targets in the first place.
Abstract Preview
Original paper
Plant DICER-LIKE, dual measurement RNA rulers.
Small RNA (sRNA)-mediated gene silencing plays critical roles in eukaryotic gene regulation. The biogenesis of the two major types of sRNA, microRNA (miRNA) and small interfering RNA (siRNA), relie...
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