Editing strigolactone hormone receptor for robust antiviral silencing in rice.
Yang G, Wu M, Zhang S, Huang Y, Liu Y
Summary
PubMedWhy it matters This matters because it points toward a new generation of disease-resistant rice that could protect harvests for billions of people who depend on rice as a staple food, without the regulatory hurdles of traditional GMOs.
Rice plants have a natural immune system that fights off viruses, but a particular virus called rice grassy stunt virus has learned to hijack a hormone signal in the plant to switch that defense off. Researchers found the exact spot on the hormone's 'receiver' protein that the virus grabs onto, then used a precise editing tool to change just one tiny piece of that receiver so the virus can no longer grip it — leaving the plant's defenses fully intact. The result is rice that resists the virus naturally, with no added foreign DNA.
chevron_right Technical Details
Scientists used precise gene editing to make rice plants resistant to a destructive virus by tweaking a single letter in the plant's DNA — no foreign genes required. The edit blocks the virus from shutting down the plant's own immune system.
Key Findings
A single amino acid change (D102N) in the rice hormone receptor DWARF14 is sufficient to block viral suppression of the plant's immune response.
The rice grassy stunt virus uses its P3 protein to physically grab and disable the plant's strigolactone hormone receptor, preventing activation of antiviral defense genes RDR1 and RDR6.
Cytosine base editing successfully introduced the D102N mutation into two different rice cultivars, conferring virus resistance without introducing any foreign transgenes.
Abstract Preview
The small interfering RNA (siRNA) pathway directs broad-spectrum antiviral defense through RNA silencing so that virulent infection requires efficient suppression of the defense mechanism. Here, we...
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