Oral microbiota of patients with phenylketonuria: A nation-based cross-sectional studyOriginal 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 dental health in 109 phenylketonuria (PKU) patients, aged 6 to 68 years, against 114 age-matched controls. PKU requires a lifelong low-protein diet, making it a natural model for diet-microbiome-oral health interactions.
How was it studied?
The team ran 16S rDNA sequencing on saliva and subgingival plaque samples, then correlated microbial composition with dental health indices such as decayed/missing/filled teeth, plaque control record, gingival bleeding, and periodontal screening scores.
What did they find?
PKU patients had worse dental health, lower oral microbial diversity, and shifted abundance of specific taxa, especially Actinobacteriota. Among PKU patients, those with poor periodontal health showed higher alpha diversity, marked by elevated Tannerella, than orally healthy PKU patients. Taxonomic differences in periodontally healthy PKU patients did not resemble typical periodontitis microbial signatures.
Why it matters
The findings suggest the metabolic demands of a lifelong low-protein diet may disrupt oral microbial and immune balance, raising inflammation risk, distinct from classic periodontitis patterns.