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Published on: August 7, 2017
Age-specific early-life gut microbiome associations with eczema and food allergies during early immune development
Harold Nunez1, Timothy J Straub1, Nabeel Imam1
1Seeding Inc., doing business as Tiny Health, Austin, TX, United States.
Insights
Gut microbiome differences linked to eczema and food allergy emerge in mid-infancy, not earlier. These changes involve reduced beneficial bacteria and increased inflammation-associated microbes, persisting into toddlerhood.
Area of Science:
- Pediatric Allergy
- Microbiome Research
- Developmental Immunology
Background:
- Eczema and food allergy often appear in infancy and are associated with gut microbiome alterations.
- The precise timing of microbiome changes preceding allergic disease development remains unclear.
Purpose of the Study:
- To determine when gut microbiome differences associated with allergic diseases first manifest during early childhood development.
- To investigate the characteristics of the gut microbiome in infants and toddlers with and without allergic conditions.
Main Methods:
- Analysis of shotgun metagenomic data from 97 children (4-36 months old) with or without physician-confirmed eczema or food allergy.
- Stratification of data into early infancy (4-6 months), mid-infancy (6-12 months), and toddlerhood (12-36 months).
- Evaluation of microbial taxa, functional pathways, and microbiome metrics, excluding recent antibiotic/probiotic use.
Main Results:
- Microbiome differences between allergic and non-allergic children were minimal before 6 months but significant in mid-infancy and toddlerhood.
- Allergic conditions correlated with decreased fiber-fermenting/butyrate-producing bacteria and increased facultative/inflammation-associated microbes.
- Reduced microbiome maturation scores and altered metabolic/inflammatory functions were observed in allergic children.
Conclusions:
- Gut microbiome divergence associated with allergic disease becomes evident by mid-infancy, indicating a critical window for immune development.
- Findings support further longitudinal and interventional studies on early microbiome-targeted strategies to potentially mitigate the atopic march.
Introduction:
Eczema and food allergy commonly emerge during infancy and are linked to changes in the gut microbiome, yet it remains unclear when microbiome differences associated with allergic disease first appear during development.
Methods:
We analyzed age-stratified shotgun metagenomic data from 97 children aged 4-36 months, including physician-confirmed cases of eczema or food allergy and non-allergic controls, excluding recent antibiotic or probiotic exposure. Microbial taxa, functional pathways, and composite microbiome metrics were evaluated across three developmental stages: early infancy (4-6 months), mid-infancy (6-12 months), and toddlerhood (12-36 months).
Results:
Differences between allergic and non-allergic children were minimal before 6 months of age but became more apparent during mid-infancy and persisted into toddlerhood. Allergic conditions were associated with reduced abundance of fiber-fermenting and butyrate-producing taxa, enrichment of facultative and inflammation-associated microbes, lower microbiome maturation scores, and shifts in metabolic and inflammatory functional capacity.
Discussion:
These findings suggest that gut microbiome divergence associated with allergic disease becomes more apparent during mid-infancy, highlighting a developmentally relevant period for understanding early immune disruption. The results support further longitudinal and interventional studies aimed at clarifying whether earlier microbiome-targeted strategies may help modify progression along the atopic march.
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