Gut Microbiota Identified as Key Regulator of Brain Plasticity During Critical Developmental Periods
Researchers disrupting gut bacteria in juvenile mice with antibiotics impaired ocular dominance plasticity in the visual cortex, while transplanting juvenile microbiota into adults restored that plasticity. The study identifies the gut microbiome as a previously unrecognized regulator of neurodevelopmental critical periods, with antibiotic treatment triggering widespread changes in visual cortex gene expression. The findings suggest early-life microbial disruptions could have lasting effects on brain function and that juvenile microbiota signals might one day be harnessed to promote plasticity in the adult brain.
A preprint study posted to bioRxiv demonstrates that the gut microbiota plays a critical role in shaping brain plasticity during sensitive windows of postnatal development in mice. When juvenile mice were treated with antibiotics to disrupt their gut microbial communities, they showed impaired ocular dominance plasticity (ODP) — a well-established measure of experience-dependent visual cortex reorganization. The antibiotic treatment also triggered extensive transcriptional changes in the visual cortex, affecting pathways related to extracellular matrix organization, blood-brain barrier integrity, and myelination. Strikingly, transplanting fecal microbiota from juvenile donors into adult mice was sufficient to restore ODP in the recipients, suggesting that microbiota-derived signals can reopen or extend plasticity windows. The authors propose that these results support the existence of microbiota-dependent critical periods in brain development. They further suggest that early-life perturbations to the microbiome — such as antibiotic exposure — may carry lasting consequences for brain function across the lifespan. The work opens potential therapeutic avenues for leveraging juvenile microbiota signals to promote neural plasticity in adults.
What's missing
As a preprint, this study has not yet undergone peer review. Key limitations include that all experiments were conducted in mice, and the mechanisms by which gut microbiota signals reach and influence the visual cortex remain uncharacterized. The specific microbial species or metabolites responsible for the plasticity effects are not identified, and it is unclear whether the antibiotic-induced transcriptional changes in the visual cortex are a direct cause or a correlate of impaired ODP. Long-term outcomes following juvenile microbiota disruption were not assessed.
What different sources said
- bioRxivCenter
The Critical Period Microbiota Shape Brain Plasticity
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