ArticleFrontiers in immunology2026
Gut microbial IgA coating in infants with traditional farming lifestyle and urban infants with allergic outcomes.
Article in Frontiers in immunology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: The sharp increase in prevalence of atopic disease suggests a role for environmental factors, such as the microbiome. Here, we study the impact of immunoglobulin A (IgA) coating of gut bacteria in infancy on allergic outcomes in two distinct populations: (1) an urbanized cohort of Rochester infants (ROC) enriched for allergies (prevalence of 40%) and (2) infants from a traditional, agrarian Old Order Mennonite (OOM) community with a low prevalence of allergies (less than 2%). Methods: We performed immunoglobulin A sequencing (IgA-SEQ) on stool samples collected at an average of 6 months of life to assess gut microbiome IgA coating levels in 9 OOM and 21 ROC infants. Atopic outcomes were diagnosed throughout the first 2 years; 10 of the ROC infants were diagnosed with atopic dermatitis and/or food allergy, while none of the OOM infants were allergic. We also assessed human milk IgA-binding of taxa-derived protein antigens, as well as IgA binding to live bacterial cell cultures. Results: Gut microbiome composition was dominated by Conclusion: Differential gut microbial IgA coating may play a role in development of allergic diseases in infancy. Human milk from communities with low rates of allergic diseases exhibit higher IgA responses to infant commensals, including
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