Gut Microbiota Identified as Key Regulator of Brain Plasticity During Critical Developmental Periods
A new study shows that disrupting gut microbiota with antibiotics during critical developmental windows impairs the brain's ability to reorganize neural connections in response to experience in mice. The research reveals that microbiota influence multiple brain processes including myelination and blood-brain barrier function. The findings suggest early-life microbial disruptions may have lasting effects on brain development and that juvenile microbiota could potentially be used to restore plasticity in adult brains.
Researchers using juvenile mice found that antibiotic-induced disruption of gut microbiota during critical periods of visual cortex development impaired ocular dominance plasticity—the brain's ability to reorganize visual processing based on experience. The disruption triggered extensive changes in gene expression across the visual cortex, affecting pathways related to extracellular matrix organization, blood-brain barrier integrity, and myelination. Notably, when researchers transplanted fecal microbiota from healthy juvenile mice into adult recipients, ocular dominance plasticity was restored, suggesting the effect is reversible and microbiota-dependent. These findings establish the gut microbiota as a previously unrecognized regulator of neurodevelopmental plasticity and support the concept of microbiota-dependent critical periods in brain development. The results suggest that early-life microbial perturbations—from antibiotics or other causes—may have lasting consequences for lifelong brain function.
Limitations & open questions
The study's own limitations and open questions include: whether findings in mice translate to human development; the specific microbial taxa or metabolites responsible for the observed effects; the duration and reversibility of plasticity impairment in the original antibiotic-treated animals; and whether similar critical periods exist for other brain functions beyond visual processing.
What different sources said
- bioRxivCenter
The Critical Period Microbiota Shape Brain Plasticity
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