CRISPR gene-drive technology: A new weapon against antibiotic resistance
Antibiotic resistance (AR) has become a global health crisis, with an estimated 10 million deaths worldwide by 2050. As bacteria evolve new ways to evade drug treatments, the threat of antibiotic-resistant bacteria is growing, especially in hospital settings, sewage treatment areas, and animal husbandry locations. But a new study from the University of California San Diego offers a glimmer of hope.
Scientists from the University of California San Diego have developed a novel method to counteract antibiotic resistance using cutting-edge genetics tools. The research, led by Professors Ethan Bier and Justin Meyer, involves a CRISPR-based technology similar to gene drives, which are already being used to disrupt the spread of harmful properties in insect populations, such as parasites that cause malaria.
The new technology, called Pro-Active Genetics (Pro-AG) or pPro-MobV, is a second-generation tool that uses a similar approach to disable drug resistance in bacteria. By introducing a genetic cassette that copies itself between bacterial genomes, the researchers can inactivate antibiotic-resistant components and restore sensitivity to antibiotic treatments.
"With pPro-MobV, we've brought gene-drive thinking from insects to bacteria as a population engineering tool," says Bier. "We can take a few cells and let them go to neutralize AR in a large target population."
The study, published in the Nature journal npj Antimicrobials and Resistance, demonstrates the technology's effectiveness in bacterial biofilms, which are communities of microorganisms that can be extremely difficult to remove under conventional cleaning methods. Biofilms contribute to the spread of disease and are created in most serious infections, making them a significant challenge in healthcare settings and environmental remediation.
"The biofilm context for combatting antibiotic resistance is particularly important," Bier explains. "If we can reduce the spread from animals to humans, we could have a significant impact on the antibiotic resistance problem, as it's estimated that half of the resistance comes from the environment."
The researchers also found that bacteriophage, or phage, can be used to carry and deliver the active genetic system. These viruses, which are natural evolutionary competitors of bacteria, can be engineered to combat antibiotic resistance by evading bacterial defenses and inserting disruptive factors inside cells. The pPro-MobV elements would work in conjunction with these engineered phage viruses, providing a powerful tool to reverse the spread of antibiotic-resistant genes.
"This technology is one of the few ways that I'm aware of that can actively reverse the spread of antibiotic-resistant genes, rather than just slowing or coping with their spread," says Meyer. "It's a significant advancement in our fight against antibiotic resistance."
The study highlights the potential of CRISPR gene-drive technology as a powerful tool in the battle against antibiotic resistance, offering a promising approach to reversing the spread of resistant bacteria and potentially saving lives.
