Alcohol and tobacco consumption affects bacterial richness in oral cavity mucosa biofilmsOriginal 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 how chronic alcohol and tobacco use affects the oral cavity mucosal microbiome. They compared healthy controls, smokers, and combined smoker/drinkers using 16S rRNA gene sequencing.
How was it studied?
Oral biofilm swabs from 22 adults in Sao Paulo, Brazil, were grouped as 9 controls, 7 chronic smoker/drinkers, and 6 smokers only. The V1 region of the 16S rRNA gene was sequenced on an Ion Torrent PGM platform, yielding 3.7 million high-quality reads clustered into OTUs.
What did they find?
Species richness was significantly lower in smokers and smoker/drinkers than in controls, though diversity and evenness did not differ. Neisseria abundance dropped significantly in both user groups versus controls. Smokers alone showed increases in Prevotella and Capnocytophaga and decreases in Granulicatella, Staphylococcus, Peptostreptococcus, and Gemella, while smoker/drinker samples had lower Fusobacteria and controls had higher Aggregatibacter.
Why it matters
Smokers' biofilm samples clustered tightly together and showed reduced inter-subject variability, suggesting tobacco pushes the oral microbiome toward a more homogenous, less diverse state. The authors suggest this altered community structure may contribute to oral disease risk.