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 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.
A novel polysaccharide purified from black wood-ear mushroom (Auricularia heimuer) protected mice from acetaminophen-induced liver injury, but antibiotic depletion of gut bacteria erased the effect and fecal transplants from treated mice reproduced it, showing the gut microbiota is mechanistically required. The likely driver is a microbial metabolite, trigonelline, acting through the AMPK/GSK3β and Nrf2/HO-1 pathways. The work is mouse-only with small groups.
Researchers built GutPath, a single-cell and spatial atlas of over 500,000 mouse gut cells across six infections, uncovering a previously unknown enterocyte state that clusters around Yersinia-induced immune lesions and appears driven by STAT1/STAT3/IL-18 signaling. The work is mouse-only with small group sizes, and the cell-lesion link is correlational, not causally tested.
A new study finds that losing a gene called EPS worsens colitis in mice by tipping immune cells toward inflammation and disrupting gut bacteria, and that EPS is also lower in people with active ulcerative colitis.
A new mouse study compares raw and ripened pu-erh tea polysaccharides, finding both fight diet-induced obesity, but through different gut bacteria, confirmed when researchers transplanted those gut microbes into other obese mice.
A new mouse study finds that an extract of the herb Senecio scandens eases allergic rhinitis symptoms, partly by reshaping gut bacteria and raising levels of the gut byproduct butyrate, which independently calmed inflamed nasal cells in the lab.
Lab grown gut communities show that Segatella copri, the bacterium behind plant-rich-diet gut profiles, cannot outcompete Bacteroides type bacteria on fiber alone. It needs E. coli or a related microbe as a partner, even when the right fiber is present.
