Metagenomic insights of the infant microbiome community structure and function across multiple sites in the United...

Area of Science:

• Microbiology
• Infant Health
• Gut Microbiome Research

Background:

• The infant gut microbiome is crucial for immune development and pathogen protection.
• Limited data exists on the healthy US infant gut microbiome's status.
• Early life gut microbial colonization impacts long-term health.

Purpose of the Study:

• To assess the composition and functional capacity of the US healthy infant gut microbiome.
• To identify potential factors contributing to infant gut dysbiosis.
• To investigate the abundance and metabolic capabilities of Bifidobacterium species.

Main Methods:

• Multi-state metagenomic survey of infant gut microbial communities.
• Analysis of bacterial composition, antibiotic resistance genes, and functional gene capacity.
• Assessment of Bifidobacterium species and their ability to metabolize human milk oligosaccharides (HMOs).

Main Results:

• High prevalence of bacteria linked to enteric inflammation (e.g., Escherichia, Klebsiella).
• Widespread antibiotic resistance genes detected across samples.
• Reduced abundance of Bifidobacterium, with limited HMO-metabolizing capacity in identified species.
• Exceptionally rare detection of Bifidobacterium infantis strains capable of complete HMO utilization.

Conclusions:

• A widespread dysbiosis exists in the contemporary US infant gut microbiome.
• The findings indicate a potential deficit in the infant's ability to utilize crucial nutrients from human milk.
• This dysbiosis may have implications for immune system development and overall infant health.