Antibiotic resistance is climbing at an alarming pace, turning once‑treatable infections into lethal threats. Projections warn that, if unchecked, resistant bacteria could claim over 10 million lives each year by 2050.
These hard‑to‑kill microbes flourish in hospitals, wastewater plants, animal farms and aquaculture facilities. To counteract this growing danger, scientists are harnessing cutting‑edge gene‑editing tools.
CRISPR‑Powered Gene Drive Targets Resistant Bacteria
At the University of California, San Diego, Professors Ethan Bier and Justin Meyer have combined CRISPR technology with the concept of gene drives—originally used in insects—to create a system that can sweep resistance genes out of bacterial communities.
The new platform, called pPro‑MobV, is a second‑generation Pro‑Active Genetics (Pro‑AG) construct. It is engineered to move horizontally between bacterial cells, locate resistance‑conferring plasmids, and deactivate the harmful genes.
How the System Restores Drug Sensitivity
The core of pPro‑MobV is a genetic cassette that homes in on plasmids—small, circular DNA pieces that often carry antibiotic‑resistance genes. Once inserted, the cassette disrupts those genes, rendering the host bacteria vulnerable to standard antibiotics once again.
Spreading Through Biofilms and Bacterial Mating
Unlike earlier versions, pPro‑MobV leverages conjugal transfer, a process akin to bacterial “mating,” to shuttle the CRISPR components from one cell to another. Experiments published in npj Antimicrobials and Resistance showed that the cassette can travel through natural mating bridges and disperse throughout dense biofilm communities.
Biofilms protect bacteria from disinfectants and antibiotics, making infections hard to eradicate. By infiltrating these structures, the gene‑drive system could prove valuable in clinical settings, water‑treatment plants, and fish farms.
Synergy With Engineered Phages
The team also discovered that bacteriophages—viruses that infect bacteria—can act as delivery vehicles for the cassette. Pairing pPro‑MobV with engineered phages may amplify the eradication of resistant strains across diverse environments.
Built‑In Safety Mechanisms
To address biosafety concerns, the platform incorporates a homology‑based deletion step, allowing researchers to remove the cassette if needed.
According to Meyer, this approach is one of the few that can actively reverse the spread of resistance genes rather than merely slowing it down.