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Tokyo Researchers Discover Giant DNA Loops Boosting Oral Health

9/15/2025

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Summary

Story summary

Researchers at the University of Tokyo identified giant DNA loops, called Inocles, in human saliva, which may improve oral health and immunity.
About 74% of people carry these extrachromosomal DNA elements, helping bacteria adapt to the oral environment.
Inocles are among the largest genetic elements in the human microbiome, averaging 350 kilobase pairs.
Advanced sequencing techniques, like preNuc, helped isolate bacterial DNA from human DNA to identify Inocles.
Initial findings indicate that individuals with head and neck cancer have fewer Inocles, suggesting potential protective benefits.

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Story summary

Researchers at the University of Tokyo identified giant DNA loops, called Inocles, in human saliva, which may improve oral health and immunity.
About 74% of people carry these extrachromosomal DNA elements, helping bacteria adapt to the oral environment.
Inocles are among the largest genetic elements in the human microbiome, averaging 350 kilobase pairs.
Advanced sequencing techniques, like preNuc, helped isolate bacterial DNA from human DNA to identify Inocles.
Initial findings indicate that individuals with head and neck cancer have fewer Inocles, suggesting potential protective benefits.