Researchers from the University of Florida College of Dentistry have found that altering the genetics of the main bacterium responsible for periodontitis progression may reduce gum tissue damage, according to a university press release dated March 3.
Furthermore, the researchers examined the genetic code of the gum disease bacteria Porphyromonas gingivalis (P. gingivalis) and identified a CRISPR array that may suppress the pathogen, according to the study.
“In P. gingivalis, a keystone periodontal pathogen, a non-coding CRISPR array has been shown to regulate biofilm formation, virulence in an invertebrate model, and the macrophage transcriptional response,” wrote the authors, led by Muhammad Irfan, PhD, of the college’s department of oral biology (Microbiol Spectr, February 25, 2026, e02834-25).
Typically, periodontal disease treatment relies on scraping away plaque, removing damaged tissue, or using antibiotics that kill bacteria indiscriminately. While some therapies can help regenerate lost tissue, clinicians may lack a precise way to stop the infection without disrupting the mouth’s healthy microbiome, according to the release.
As a driver of periodontal disease, P. gingivalis can manipulate the oral microbial community and shift it from health to disease. Even in small amounts, scientists consider it a key pathogen because of its ability to influence other microbes.
The researchers discovered that this bacterium carries an internal genetic “brake” that helps regulate its own aggression. Their study focused on a CRISPR array, which is normally part of a bacterial immune system used to detect and destroy invading viruses. Unlike typical CRISPR sequences, this array contained mysterious genetic material that matched the bacterium’s own DNA rather than that of a virus, according to the release.
When researchers removed the array using gene editing, the bacterium became more aggressive, producing twice as much biofilm and causing stronger immune reactions. The findings suggest that the bacterium uses its genetic “brake” to limit its virulence and avoid triggering a strong immune response, allowing it to persist in the gums and contribute to chronic infection.
In the future, therapies could use viruses that target specific bacteria to deliver CRISPR instructions directly to P. gingivalis. This approach may lock the bacterium’s genetics in place, reducing gum disease while preserving the mouth’s healthy microbial balance, according to the release.
“Elucidating the role of CRISPR arrays in P. gingivalis may have broader clinical implications, given the established associations between periodontal health and systemic inflammatory diseases,” Irfan and his team wrote.
