The intrauterine microbiome–neurodevelopment axis: decoding the prenatal microbial imprint on lifelong mental health

Summary

This narrative review synthesises evidence from preclinical and clinical studies to elucidate how the maternal microbiota influences fetal brain development through interconnected immune, metabolic, epigenetic, and hormonal pathways. Mouse models demonstrate that maternal immune activation disrupts cortical architecture, whilst human cohort studies (>250,000 pregnancies) associate maternal inflammatory markers with increased autism spectrum disorder risk; microbial metabolites and epigenetic modifications in placental tissue further mediate neurodevelopmental programming. The authors acknowledge that whilst mechanistic insights are robust in animal models, human evidence remains largely observational, and identify maternal microbiota profiling, dietary optimisation, and probiotic supplementation as emerging translational approaches.

Regional applicability

The review synthesises primarily international preclinical and observational cohort evidence; its findings are broadly applicable to United Kingdom pregnancy and paediatric populations, though implementation of recommended preventive strategies would require integration into existing antenatal care pathways and further validation of causal mechanisms in UK populations.

Key measures

Maternal inflammatory cytokines (IL-6, IL-17A); microbial metabolites (butyrate, acetate, propionate, bile acids, tryptophan derivatives); epigenetic markers (DNA methylation, histone acetylation); incidence of autism spectrum disorder and ADHD in offspring; cortical layering and synaptic organization (in preclinical models)

Outcomes reported

The review synthesizes evidence from over 90 studies examining how maternal microbiota-derived signals, immune activation, and microbial metabolites influence fetal brain development and long-term neuropsychiatric outcomes including autism spectrum disorder and ADHD risk.

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