Codevelopment of gut microbial metabolism and visual neural circuitry over human infancy

Area of Science:

• Microbiome research
• Neuroscience
• Developmental biology

Background:

• Infancy features high neuroplasticity for brain and sensory development.
• The gut microbiome changes significantly in early life and may impact brain development via neuroactive compound metabolism.

Purpose of the Study:

• To investigate the association between gut microbial metabolism and visual cortical neurodevelopment in infants.
• To explore how early-life microbiome composition influences later brain development.

Main Methods:

• Longitudinal study of 194 South African infants over 18 months.
• Analysis of microbial genes encoding enzymes for neuroactive compounds (GABA, glutamate, tryptophan, SCFAs).
• Measurement of visual cortical neurodevelopment using Visual-Evoked Potential (VEP).

Main Results:

• Microbial gene sets at 4 months were strongly associated with VEP measures from 9-14 months.
• Prospective associations between microbial metabolism and VEP were more numerous than concurrent ones.
• Specific microbial metabolic pathways linked to neuroplasticity modulated visual neurodevelopment.

Conclusions:

• Early gut microbiome metabolic potential plays a critical role in shaping neural plasticity and visual neurodevelopment.
• Microbial metabolism in early infancy may influence subsequent neural development.
• The gut-brain axis is a significant factor in early neurodevelopmental trajectories.