Farming-Associated Maternal Microbiome Linked With Lower Early Childhood Atopic Disease
Key Takeaways
- Pregnant women living a traditional Old Order Mennonite farming lifestyle had significantly greater gut microbiome diversity than urban/suburban mothers, with distinct bacterial species and functional metabolic profiles.
- Farming-associated microbiome differences were linked to higher maternal and cord blood short-chain fatty acids and infant IgA levels, suggesting potential prenatal immune programming.
- Among urban mothers, reduced abundance of specific bacterial species was associated with offspring who later developed atopic dermatitis or IgE-mediated food allergy.
A maternal gut microbiome shaped by a traditional farming lifestyle may help explain the protective effect of prenatal farm exposure against atopic disease in children, according to new research published in Allergy.
Researchers compared the perinatal gut microbiomes of 68 pregnant women from an Old Order Mennonite (OOM) farming community with 55 urban/suburban women from Rochester, New York, using deep shotgun metagenomic sequencing. The analysis found that OOM mothers harbored significantly greater gut microbial diversity and distinct microbial communities, including differences in species from the Dorea, Anaerobutyricum, Bifidobacterium, and Bacteroides genera. These compositional differences also translated into marked changes in microbial functional capacity.
Maternal Microbiome May Influence Fetal Immune Programming
Metabolomic analyses showed higher maternal serum acetate and isobutyrate concentrations in OOM participant, correlating with cord blood concentrations and infant systemic IgA levels. Among urban mothers, investigators also identified associations between maternal microbiome composition and allergic outcomes in offspring. Dorea longicatena was least abundant in mothers whose children later developed atopic dermatitis, while Segatella copri was depleted in mothers of children who developed IgE-mediated food allergy alone. Both species were comparatively abundant in OOM mothers.
The study was observations, limiting applicability.
"Together, these findings highlight the maternal gut microbiome and metabolites as potential contributors to prenatal farming lifestyle protection against early childhood allergic disease," the authors wrote.
Source
Davis EC, et al. Allergy. 2026. Doi:10.1111/all.70446.