Metagenomic analysis of microbiological changes on the ocular surface of diabetic children and adolescents with a dry eyeOriginal 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 ocular surface microbiome composition and function across three groups of children aged 8 to 16: diabetic children with dry eye (n=10), diabetic children without dry eye (n=10), and healthy non-diabetic children (n=10), drawn from the Shanghai Children and Adolescent Diabetes Eye Study.
How was it studied?
Conjunctival sac swabs were collected from each child and analyzed using shotgun metagenomic sequencing, which identifies both microbial species and functional genes rather than relying on 16S rRNA sequencing or culture methods.
What did they find?
Ocular microbiota included bacteria, viruses and fungi, with Firmicutes, Apicomplexa, Proteobacteria and Actinobacteria as dominant phyla. The dry eye group showed significantly lower alpha and beta diversity than healthy children (P<0.05), fewer total and unique microbial species, and functional genes skewed toward human disease pathways, antibiotic resistance, and carbohydrate, coenzyme and lipid metabolism. Healthy children instead showed enrichment in replication, repair, signal transduction and defense related genes.
Why it matters
The findings suggest that a distinct, less diverse ocular microbiome and its shifted metabolic functions may contribute to dry eye pathogenesis in diabetic children, though the authors note the small sample size and call for larger multicenter studies.