Dysbiosis of Oral Microbiota and Metabolite Profiles Associated with Type 2 Diabetes MellitusOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Researchers compared oral microbiota and metabolites in people with type 2 diabetes mellitus (T2DM) who had no oral disease against normal controls. The goal was to see whether oral microbes and metabolites shift before any visible oral disease appears.
How was it studied?
The team ran metagenomic sequencing and nontargeted metabolomic analysis on saliva and supragingival plaque samples from T2DM patients and controls, all free of oral disease.
What did they find?
Periodontal pathogens Porphyromonas gingivalis and Prevotella melaninogenica were significantly enriched in T2DM patients, while caries-linked species Streptococcus mutans and Streptococcus sobrinus showed no significant difference. Salivary cadaverine and L-(+)-leucine were elevated, and supragingival plaque N-acetyldopamine and 3,4-dimethylbenzoic acid were higher in T2DM, with specific oral microbes linked to dysregulated metabolites like cadaverine and N,N-dimethylarginine.
Why it matters
These shifts occur even when the mouth looks clinically healthy, suggesting oral microbial and metabolite changes could serve as early biomarkers for periodontal disease risk in T2DM before symptoms appear.