Gene cluster discovery may help good oral bacteria outcompete cavity-causing strains
A research team at the University of California, Berkeley, has identified a gene cluster in the oral microbiome that could help beneficial bacteria outcompete cavity-causing strains. The breakthrough highlights how genetic-level studies of the oral microbiome may transform approaches to dental caries prevention.
The study, led by Professor Wenjun Zhang of UC Berkeley’s Department of Chemical and Biomolecular Engineering, examined the oral metagenome—the collection of DNA sequences from all bacteria in the mouth. By analyzing microbial communities from human volunteers, the team found a previously unknown gene cluster capable of producing two molecules that strengthen bacterial biofilms.
Lipopeptide molecules strengthen biofilms
The identified gene cluster produces two novel lipopeptide molecules that work together to encourage bacteria to clump and link into chains. This activity strengthens biofilm formation on tooth surfaces.
While dental biofilms are often linked to cavity-causing bacteria, the researchers believe these molecules could also be used by beneficial oral bacteria to establish stronger colonies and defend against harmful strains.
“Particular strains belonging to the same species can be a pathogen, a commensal, or even probiotic,” Professor Zhang explained. “After we better understand these molecules’ activity, we can introduce them to the good bacteria so they can form strong biofilms and outcompete all the bad ones.”
Implications for oral health
The findings suggest that future therapies could leverage these molecules to:
- Strengthen probiotic or beneficial strains in the oral microbiome.
- Develop targeted strategies to prevent dental caries without disrupting the entire microbial community.
- Reduce reliance on broad-spectrum antibacterial treatments.
The study was published recently in the Proceedings of the National Academy of Sciences and supported by the U.S. National Institutes of Health (NIH), specifically the National Institute of Dental and Craniofacial Research.
This discovery underscores the growing importance of studying the oral microbiome at a genetic level and its potential to revolutionize preventive dentistry.
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