Carmine Martino
BIOL-2110-001
Dr. Guy Barbato
April 25th, 2026
A recent study found that human genetics can influence the oral microbiome and may increase the risk of dental caries, like decay in some people. Scientists analyzed saliva-derived DNA from more than 12,500 individuals and measured the levels of 439 common microbial species found in the mouth.
The findings showed a surprisingly large effect of human genetics on the abundance of microbes in the mouth. The team identified 11 regions of the human genome associated with differences in the levels of dozens of bacterial species. One gene called AMY1 was strongly linked to the composition of the oral microbiome and even denture use, suggesting that interactions between human genes and oral bacteria may play a role in dental health. The strongest relationship found was between a genetic variant that disrupts the FUT2 gene and the levels of 58 oral bacterial species. The article explains that these findings show a strong interaction between human DNA and the DNA of bacteria living in the mouth.
I particularly enjoyed reading about this topic because I used to work as a dental assistant, and I would sometimes notice family member's of patients coming in with similar oral health problems even when they seemed to have good home care habits. Reading about how genetics can play a role in a patient's oral health made those experiences make more sense to me.
Article:
https://medicalxpress.com/news/2026-01-genes-microbes-mouths-dental-health.html
Second Source:
https://www.frontiersin.org/journals/dental-medicine/articles/10.3389/fdmed.2022.1060177/full
This is a really interesting perspective on how genetics can influence oral health, especially through its interaction with the oral microbiome. It’s easy to assume that things like cavities are mainly due to hygiene or diet, but this highlights how underlying genetic factors can shape which bacteria thrive in the mouth. The findings about genes like AMY1 and FUT2 are especially compelling because they show how even small genetic differences can have a broad impact on microbial composition.
ReplyDeleteIt’s really interesting that even with good oral hygiene, genetics can still increase someone’s risk for cavities. The connection between genes like AMY1 and FUT2 and the oral microbiome shows how complex dental health actually is. It also makes me wonder if dentists might eventually use genetic testing to predict risk and personalize treatment.
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