Tobacco exposure associated with oral microbiota oxygen utilization in the New York City Health and Nutrition Examination 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 examined whether tobacco exposure, including active smoking and secondhand exposure, alters the oral microbiome. They analyzed 259 oral rinse samples from the 2013-2014 New York City Health and Nutrition Examination Study (NYC HANES), selected by self-reported smoking status and serum cotinine level.
How was it studied?
The team used 16S rRNA gene V4 amplicon sequencing to profile bacterial operational taxonomic units (OTUs). They compared differential OTU abundance across primary and secondhand tobacco exposure groups, then applied microbe set enrichment analysis to test for coordinated shifts in microbial oxygen utilization (aerobic, anaerobic, facultative anaerobic).
What did they find?
Current cigarette smoking was linked to significant depletion of aerobic OTUs (Enrichment Score = −0.75, P = .002), with only 29% of aerobic OTUs more abundant in smokers than never-smokers. Proteobacteria, including several component genera, were consistently less abundant in smokers in both crude and confounder-adjusted models. Beta diversity differed significantly between current smokers and never-smokers, while former smokers resembled never-smokers more than current smokers. Nonsmokers with higher secondhand smoke exposure (serum cotinine) showed abundance shifts correlated with those seen in active smokers.
Why it matters
The findings support a plausible dose-dependent link between tobacco smoke exposure and a shift toward an oxygen-depleted, more anaerobic oral microbial environment. This mechanism could plausibly connect smoking to periodontal disease and other tobacco-related oral and systemic conditions.