A genomic and metagenomic survey across 45 countries finds that one bacterial lineage, Escherichia marmotae, dominates global carriage of a DNA-damaging toxin gene cluster linked to colorectal tumor growth in lab models; based on the study's abstract only, full text not obtained.
A narrative review in the Future Healthcare Journal argues the mouth's 700-species bacterial community has been structurally excluded from medicine, despite strong links to type 2 diabetes, cardiovascular disease, and preterm birth, and weaker, associative links to Alzheimer's and cancer.
A national Chinese medical committee has issued a formal clinical guideline covering probiotics, prebiotics, synbiotics, postbiotics and fecal microbiota transplant for patients with metabolic associated fatty liver disease, including detailed FMT donor screening rules.
A gut bacterial metabolite called imidazole propionate (ImP) tracked with lower cognitive scores and more Alzheimer's-related brain biomarkers in nearly 1,200 adults. A genetic analysis and mouse experiments suggest the link may be causal, though modest, and the human findings remain largely observational.
A multi-omics study of 29 acne patients and 20 controls, with mouse validation, identifies gamma-glutamyl tyrosine (GGTyr) as a gut metabolite that promotes C. acnes growth and worsens acne-like lesions. The human findings are correlational; the causal GGTyr-to-C. acnes link comes from mice.
Deep genetic sequencing shows the Tsimane of Bolivia and the Hadza of Tanzania still share 1,231 gut microbial species despite tens of thousands of years of separation, with strain-level dating suggesting co-migration with early human populations out of Africa and into the Americas. Most of the shared species are missing from industrialized guts today.
In a secondary analysis of a diet trial for multiple sclerosis, gut bacteria's propionate making potential rose most under a ketogenic diet, and within that group, bigger shifts tracked with smaller brain lesion growth. The trial's main result found no diet difference, and the authors call this exploratory.
A single-cell atlas of the mouse gut lining, corroborated by biopsies from children, finds that peanut allergy susceptibility tracks with a complete loss of the antimicrobial enzyme lysozyme in Paneth cells, with a plausible gut microbiome mechanism behind it.
A mouse and human-cell study links a microRNA called miR-29a to gut bacterial bile-acid processing and colitis severity. Mice lacking it developed worse colitis, converted less of a protective bile acid, and their gut cells lost some of that bile acid's anti-inflammatory power - a plausible mechanism, not yet confirmed in humans.
Reprocessing four public Alzheimer's gut-microbiome datasets through one pipeline found that most previously reported bacterial signatures don't hold up across independent cohorts. Only one genus, Lachnospira, consistently tracked with Alzheimer's status in all four studies - a preliminary, correlational finding from a single unreviewed preprint.
