Analysis of Salivary Microbiome in Patients with Alzheimer's DiseaseOriginal 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 the salivary microbiome of 39 Alzheimer's disease (AD) patients against 39 healthy controls. They also examined whether bacterial composition differed by APOEɛ4 carrier status, a strong genetic risk factor for sporadic AD.
How was it studied?
Saliva samples were collected from all 78 subjects and analyzed using 16S ribosomal RNA sequencing to profile the microbiota. APOE genotype was determined separately using Sanger sequencing.
What did they find?
AD patients showed significantly lower richness and diversity of salivary microbiota than healthy controls. Moraxella, Leptotrichia, and Sphaerochaeta were enriched in AD saliva, while Rothia was significantly reduced. Among AD patients, APOEɛ4 carriers had comparatively more Abiotrophia and Desulfomicrobium but less Actinobacillus and Actinomyces than non-carriers. No taxa were linked to AD severity.
Why it matters
This is the first study to characterize salivary microorganisms in AD patients, adding support for a role of the oral microbiome in AD development and suggesting APOEɛ4 status may shape this oral bacterial profile.