High-fat feeding rather than obesity drives taxonomical and functional changes in the gut microbiota in miceOriginal 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 gut microbiota changes driven by high-fat diet versus obesity itself. They used obesity-prone C57BL/6JBomTac (BL6) and obesity-resistant 129S6/SvEvTac (Sv129) mice, whose weight gain responds oppositely to the cyclooxygenase inhibitor indomethacin.
How was it studied?
Fifty-four male mice were fed low-fat, high-fat, or high-fat plus indomethacin diets for six weeks. Fecal DNA underwent whole genome shotgun sequencing, generating a 793,847-gene non-redundant catalog for taxonomic and functional profiling.
What did they find?
Diet, not strain or obesity status, was the dominant factor separating microbiota profiles in principal coordinates analysis. High-fat feeding raised alpha diversity and gene count in both strains and increased the Firmicutes to Bacteroidetes ratio, while indomethacin caused no significant shift despite altering obesity outcomes. Sv129 mice carried more butyrate-producing genera and higher abundance of butyrate-formation genes than BL6 mice on either diet, whereas BL6 mice had more genes for propionate metabolism, a pathway linked to greater energy harvest.
Why it matters
The findings indicate diet composition, rather than the obese state, is the primary driver of gut microbiota change in mice. Strain differences in butyrate versus propionate production capacity may help explain differing susceptibility to diet-induced obesity.