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Researchers Identified Fungal dsRNA Off-Target Risks

A new in-silico screen found potential hazards in most double-stranded RNA constructs designed to target specific fungi.

Updated on Sept. 28, 2026 in Life Sciences

Isometric editorial illustration of a petri dish with mycelium networks and a pipette, representing genetic research on fungal control.
Researchers found that most RNA-based fungal treatments contain genetic matches that could inadvertently harm beneficial soil fungi, according to a recent in-silico screen. AI Illustration. Upload story photo >

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Scientists evaluated twelve double-stranded RNA (dsRNA) constructs for potential cross-reactivity with seven non-target beneficial fungi. The analysis revealed that eleven of the twelve designs contained perfect 21-nucleotide matches capable of affecting these non-target organisms.

Why it matters

Understanding off-target impacts is essential for the safe development of RNA-based agricultural treatments. Without precise targeting, these tools risk inadvertently damaging beneficial fungi that play critical roles in soil health and ecosystem stability.

Researchers screened twelve dsRNA constructs against seven non-target fungi using a 21-nucleotide identity criterion. While most constructs displayed multiple matches, the TUB2b construct contained 580 perfect 21-nucleotide matches.

The details

The screen compared transcriptomes against seven species, including Trichoderma harzianum and Beauveria bassiana, finding that matches were concentrated within the Hypocreales order. Only the CYP51C construct remained free of these unintended genetic matches.

Timeline

  1. September 28, 2026: The study results were published.

The Big Picture

This discovery shifts the trajectory of RNA-interference (RNAi) agricultural pesticide development by highlighting the high frequency of unintended genetic cross-reactivity. It challenges the assumption of high specificity in current dsRNA designs and necessitates a revision of existing orthologue-targeting strategies.

This research could lead to more stringent design requirements for future agricultural products to prevent ecological damage. Improved targeting accuracy will be essential for regulators to approve RNA-based treatments for commercial use.

The takeaway

Designers of RNA-based treatments must prioritize high-specificity sequences to avoid disrupting beneficial soil ecosystems. Future screening protocols will likely require broader transcriptome comparisons to ensure ecological safety.

Further reading

For more context on current genetic research, explore our Life Sciences section.

More information

Read the full scientific study paper to understand the screening methodology.

Source note: This article includes information reported by Biorxiv.

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