Genetically Engineered Wax Moths Pave Way for Faster AMR Testing and Reduced Animal Use

University of Exeter scientists have created the world's first genetically engineered wax moths. This groundbreaking development aims to accelerate testing for antimicrobial resistance (AMR) and significantly reduce the need for mice and rats in infection research.

"These 'sensor moths' are designed to illuminate when infected or responding to antibiotics, providing a real-time view into disease processes."

A Sustainable Alternative: The Greater Wax Moth

The greater wax moth (Galleria Mellonella) is increasingly recognized as a cost-effective and ethically sustainable alternative to traditional mammalian models. Its unique advantages include the ability to be reared at 37 degrees Celsius, mirroring human body temperature, and a cellular response to infection that is notably similar to that of mammals.

Engineering "Sensor Moths" for Real-Time Insights

Researchers at Exeter developed sophisticated genetic tools, adapting existing technologies from fruit fly research. This led to the creation of fluorescent transgenic and gene-edited moth lines. These innovative "sensor moths" are designed to visibly illuminate when infected or responding to antibiotics, offering a live, real-time window into disease processes within a whole organism.

Accelerating AMR Research and Reducing Animal Testing

This new technology is poised to transform early-stage infection studies. It enables rapid antimicrobial screening and detailed immune response analysis without the need for mice or rats. The wax moth larvae have demonstrated responsiveness to critical human pathogens, including Staphylococcus aureus and Candida albicans, making them highly relevant for clinical research.

The ability to precisely insert, delete, or modify genes in wax moths opens extensive avenues for understanding innate immunity and developing advanced, real-time biosensors for infection. Crucially, this innovation promises to significantly reduce the use of animals in scientific experimentation. Annually, approximately 100,000 mice are used in the UK for infection biology research; replacing just 10% of these studies with moths could spare over 10,000 mice per year while still generating robust and relevant data.

Fostering Global Adoption

The Exeter team is committed to widespread adoption of this model organism. They have made all methods openly available through the Galleria Mellonella Research Centre, actively supporting its integration into research globally.