Gene-editing research focuses on cholesterol-related weakness in crop pests
Cotton growers across the United States have long struggled with destructive insects that reduce yields and cut into farm profits. Now, researchers at Texas A&M AgriLife Research say a new approach could offer a promising addition to pest management strategies by targeting how insects obtain essential nutrients.
The research centers on a surprising factor: cholesterol—and how plant-feeding insects depend on it.
A biological vulnerability in plant-feeding insects
Why cholesterol matters for pests
Unlike humans and other animals, plant-feeding insects cannot produce their own cholesterol. Instead, they rely entirely on compounds found in plants, known as phytosterols, which they convert into cholesterol necessary for growth and reproduction.
According to Gregory Sword, a Regents Professor and cotton entomology expert, this difference creates an opportunity.
“Everybody knows cholesterol,” Sword said. “But insects need it and obtain it in a very different way than we do. Our research identified that difference as a weakness we can exploit to protect plants.”
Altering plant chemistry to disrupt insect growth
The research team discovered that by modifying the types of sterols plants produce, they can effectively disrupt insect development. Instead of providing “beneficial” sterols that pests easily convert, scientists engineered plants to produce sterols that are more difficult for insects to process.
Early experiments using Arabidopsis, a model plant commonly used in genetic research, showed promising results. Insects feeding on modified plants did not die immediately, but they developed more slowly, reproduced less, and failed to reach damaging population levels.
“It’s not a magic bullet that kills insects,” Sword explained. “But you just need to keep populations below damaging thresholds. That’s the key to any successful integrated pest management program.”
Expanding the research into cotton crops
Applying gene-editing tools like CRISPR
With initial success in lab models, the team is now applying the concept to cotton—one of the most economically important crops in the southern United States.
Supported by Cotton Incorporated and the U.S. Department of Agriculture, researchers are using advanced biotechnology tools such as RNA interference (RNAi) and CRISPR gene editing. Their goal is to adjust cotton’s sterol composition by targeting a gene known as Hydra1.
The project involves collaboration with plant biotechnology experts, including Keerti Rathore, known for his work in crop transformation.
Early results show promise
Initial findings suggest that genetically modified cotton plants can grow normally while producing the desired sterol changes. These plants are now undergoing further testing to determine how effectively they can deter pests such as aphids, caterpillars, and lygus bugs—common threats in U.S. cotton fields.
Researchers are currently evaluating plant performance, sterol composition, and insect responses across multiple generations of crops.
A potential breakthrough for integrated pest management
Broad protection against multiple pest species
One of the most significant advantages of this approach is its potential to work across a wide range of plant-feeding insects. Because many pests share the same reliance on plant-derived sterols, a single genetic modification could provide protection against multiple species.
“This is a weakness shared by all plant-feeding insects—from aphids to caterpillars to stink bugs,” Sword said. “One trait could potentially protect against a whole range of different insects.”
Reducing reliance on chemical insecticides
If successful, this innovation could help U.S. farmers reduce their dependence on traditional insecticides, which can be costly and raise environmental concerns. Instead, crops themselves would play a more active role in pest control—aligning with broader trends in sustainable agriculture and biotechnology.
This approach could be particularly valuable in states like Texas, Georgia, and Mississippi, where cotton production is a major part of the agricultural economy and pest pressure remains a persistent challenge.
Conclusion
The work by Texas A&M AgriLife Research highlights a novel strategy for protecting crops by targeting the nutritional needs of pests rather than attempting to eliminate them outright. While still in the experimental stage, the research offers a potential path toward more sustainable and efficient pest management in cotton farming—one that could reshape how growers protect yields in the years ahead.
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