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Bacterial colonization reprograms the neonatal gut metabolome.

Kyle Bittinger1, Chunyu Zhao2, Yun Li3

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The infant gut microbiome is established within hours of birth, impacting the early metabolome. Bacterial colonization alters human protein and amino acid levels, with amino acid fermentation fueling early microbial growth.

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Area of Science:

  • Microbiology
  • Metabolomics
  • Neonatal Health

Background:

  • The initial microbial colonization of the infant gut is critical for long-term health.
  • Understanding the early gut microbiome and its metabolic consequences is an emerging field.

Purpose of the Study:

  • To characterize the neonatal gut microbiome, proteome, and metabolome in African-American newborns.
  • To investigate the biochemical impact of initial microbial colonization.

Main Methods:

  • Analysis of fecal samples from 88 newborns using molecular methods for microbiome analysis.
  • Proteomic and metabolomic profiling to assess host and microbial biochemical changes.
  • Flux balance modeling and in vitro experiments to study bacterial metabolism.

Main Results:

  • Gut bacteria were detectable by 16 hours after birth.
  • Bacterial presence correlated with decreased human proteins, lower amino acids, and increased fermentation products (acetate, succinate).
  • Amino acid fermentation was identified as a key mechanism for early Escherichia coli growth.

Conclusions:

  • Provides a comprehensive characterization of the first microbes in the human gut.
  • Demonstrates how early microbial colonization significantly alters the neonatal biochemical environment.
  • Highlights the link between the early microbiome and host metabolism.