Gut Microbiota Influence on Neuropsychiatric Disorders

The gut microbiota comprises a vast and dynamic community of microorganisms that engage in continuous two-way communication with the central nervous system via neural, endocrine and immune routes. This gut-brain axis shapes brain development, modulates neurotransmitter synthesis and regulates stress responses. Perturbations in microbial composition, or dysbiosis, can alter the production of short-chain fatty acids, modify tryptophan metabolism and provoke systemic and neuroinflammation, thereby contributing to the onset or progression of conditions such as depression, bipolar disorder, schizophrenia, autism spectrum disorder and attention-deficit hyperactivity disorder. Emerging evidence highlights that microbiota-derived metabolites influence microglial activation and blood–brain barrier integrity, while immune mediators and vagal afferent signalling relay gut status to limbic and cortical regions. Clinically, modulating the gut ecosystem through dietary interventions, probiotics, prebiotics or faecal microbiota transplantation offers novel avenues for adjunctive therapy. Understanding the mechanisms by which microbial communities impact neural circuits promises to improve diagnostic stratification, facilitate personalised treatment and address global mental-health challenges.

Research from Nature Portfolio

Metagenomic analysis of treatment-naïve schizophrenia patients has revealed a microbial species classifier capable of distinguishing individuals with the disorder from healthy controls with high accuracy, underscoring the diagnostic potential of faecal microbial profiles. Functional pathway reconstruction indicates alterations in short-chain fatty acid synthesis, tryptophan metabolism and neurotransmitter biosynthesis in affected individuals. Experimental transplantation of a schizophrenia-enriched bacterium into germ-free mice induced social-behaviour deficits and disrupted peripheral neurotransmitter levels, demonstrating a causal role for specific gut microbes in modulating brain function. These findings lay the groundwork for targeted microbial interventions and mechanistic studies in animal models and patient cohorts.

Gut Microbiota Influence on Neuropsychiatric Disorders publication trend

The graph below shows the total number of articles in gut microbiota influence on neuropsychiatric disorders across all publications each year (not limited to Nature Index journals).

Technical terms

Gut-brain axis: A bidirectional communication network linking the gastrointestinal microbiota with the central nervous system through neural, endocrine and immune pathways.

Dysbiosis: A state of imbalance or maladaptation in the composition and function of the gut microbial community, often associated with disease.

Short-chain fatty acids (SCFAs): Microbial metabolites such as acetate, propionate and butyrate that influence immune function, intestinal integrity and neuronal signalling.

Neuroinflammation: An inflammatory response within the central nervous system involving glial activation and pro-inflammatory mediators.

Metagenomic classifier: A computational model that uses genome-wide microbial data to distinguish between disease and healthy states.

References

1. Schizophrenia and obesity: May the gut microbiota serve as a link for the pathogenesis?. iMeta (2023).
2. Microbiota–gut–brain axis mechanisms in the complex network of bipolar disorders: potential clinical implications and translational opportunities. Molecular Psychiatry (2023).
3. Psycho-Pharmacomicrobiomics: A Systematic Review and Meta-Analysis. Biological Psychiatry (2023).
4. The gut microbiome from patients with schizophrenia modulates the glutamate-glutamine-GABA cycle and schizophrenia-relevant behaviors in mice. Science Advances (2019).
5. Metagenome-wide association of gut microbiome features for schizophrenia. Nature Communications (2020).
6. The Microbiota–Gut–Brain Axis in Psychiatric Disorders. International Journal of Molecular Sciences (2022).