Diverse events have transferred genes for edible seaweed digestion from marine to human gut bacteria.
Level 5 - mechanism / opinion, no new human data
Bench microbiology and comparative genomics research without human clinical data
PubMed 35240043 · doi:10.1016/j.chom.2022.02.001
What was done
Enrichment culturing and genomic analysis were performed to determine whether and how genes for digesting edible seaweed polysaccharides have transferred from marine microbes into human gut bacteria, focusing on Bacteroides and gut-resident Firmicutes.
What was found
No quantitative figures, sample sizes, or effect estimates are reported in the abstract. Qualitatively, enrichment-cultured Bacteroides and gut-resident Firmicutes contained marine bacteria-derived genes and mobile DNA elements encoding seaweed-degrading enzymes, indicating that gene mobilization occurred through multiple separate horizontal transfer events.
Why it matters
This demonstrates that the acquisition of marine polysaccharide digestion pathways by human gut microbes is more widespread and phylogenetically diverse than previously recognized, underscoring gut microbiome metabolic plasticity under dietary pressures.
Limits
The abstract reports no numbers, sample sizes, population sources, or quantitative prevalence rates. Findings are based on in vitro enrichment cultures and genomic analyses without in vivo human dietary trial data.
Cited by
- supports Eating sushi provides the human gut with bacteria that facilitate the absorption and digestion of nutrients from seaweed.