The Influence of Age and Sex on Ocular Surface Microbiota in Healthy AdultsOriginal 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?
This observational study characterized how age and sex influence the ocular surface (conjunctival) microbiome in healthy adults. The authors profiled bacterial community composition, metabolic functions, and antibiotic resistance genes using metagenomic shotgun sequencing.
Who was studied?
Ocular surface microbiome samples were collected from the inferior bulbar conjunctiva of 90 healthy adults (48 young and 42 old) at Zhongshan Ophthalmic Center in Guangzhou, China. Sequencing was performed by metagenomic shotgun sequencing rather than 16S amplicon sequencing, and per the MeSH indexing the participants spanned young adulthood through 80 years and older.
What were the most important findings?
Male and female groups differed only in the beta diversity (between-sample composition) of their bacterial communities. In contrast, young and old adult groups showed significant differences in bacterial composition, metabolic functions, and the abundance of antibiotic resistance genes. The abstract does not report specific differentially abundant taxa or their direction of change.
What are the greatest implications of this study?
The authors conclude that age and sex collectively shape the conjunctival microbiome and may alter immune homeostasis of the ocular surface through changes in its commensal microbes. As a cross-sectional observational study, these results describe associations rather than causation.