Nutrients · 14 authors, 7 centres
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This longitudinal sub-study of 60 children in Pakistan analyzed gut microbiota from 3 to 24 months of age, finding that age was the primary driver of changes in microbial diversity and composition, with no significant differences between urban/rural locations or intervention arms. The main limitation is the small sample size and lack of accounting for factors like antibiotic use and diet.
The study aimed to longitudinally evaluate the intestinal microbiota in young children in resource-limited settings, focusing on age and residential location effects, as part of a larger trial on micronutrient supplementation. Methods: This was a prospective pilot sub-study of 60 children (10 per intervention arm per location) from a cluster-randomized trial in Pakistan. Fecal samples were collected at 3, 6, 9, 12, 18, and 24 months for 16S rRNA sequencing. Analyses included beta diversity (PCoA of weighted UniFrac distances), alpha diversity indices, and relative abundance of major taxa, using linear mixed-effects models adjusted for gender, location, and diarrheal episodes. Key Results: Age was the dominant factor affecting the gut microbiota. Beta diversity showed significant differences between age groups (p < 0.05 to p < 0.001), but no clustering by location or intervention. Alpha diversity indices (Chao, equitability, Shannon, PD) all increased significantly with age (p < 0.0001). Relative abundance of phyla changed with age: Firmicutes and Bacteroidetes increased, while Actinobacteria and Proteobacteria decreased (all p < 0.0001). Genera like Bifidobacterium, Escherichia/Shigella, and Streptococcus decreased with age (p < 0.0001 to p = 0.0003). LEfSe analysis identified differentially abundant taxa between the first and second years of life and between urban/rural locations at specific ages, but few differences between intervention arms. Limitations: The study had a small sample size (n=60), did not account for antibiotic use, diet, or diarrheal episodes, and used an older sequencing platform (Roche 454). The parent trial did not include a healthy cohort. Implications: The findings highlight age-related maturation of the gut microbiota in children, but the small sample and lack of association with nutritional status or interventions limit clinical conclusions. Future studies with larger cohorts and advanced analytics are needed.
