Study Links Schizophrenia Genetic Risk to Delayed Brain Development and GABA Maturation
A new preprint study finds that individuals with above-average polygenic risk for schizophrenia show measurable delays in prefrontal cortex gene expression maturation and disrupted GABAergic signaling, even without any clinical symptoms or detectable neuropathology. Researchers used a novel 'liquidity' metric to convert postmortem brain gene expression data into dynamic developmental trajectories across the lifespan. The findings suggest that schizophrenia risk may be detectable at a biological level long before the disorder typically onsets in early adulthood, potentially opening avenues for earlier intervention.
Researchers developed a novel computational tool called 'liquidity' to track how gene co-expression networks evolve across the human lifespan using postmortem prefrontal cortex data. They found that normal brain development becomes increasingly 'liquid'—meaning more dynamically reorganized—during the first two decades of life, with sharp transitions at birth and adolescence. Neurotypical individuals carrying above-average polygenic risk scores for schizophrenia showed a generalized delay in these developmental dynamics compared to low-risk individuals, despite having no detectable neuropathology. The biological processes most affected converged on delayed maturation of GABA-A receptor function, which is critical for establishing the excitatory/inhibitory balance in the developing brain. High-risk individuals also showed an elevated ratio of NKCC1 to KCC2 gene expression—mirroring a pattern seen in schizophrenia patients—which relates to the so-called perinatal GABA switch, a key developmental transition in how GABA signaling operates. Notably, these effects were specific to the dorsolateral prefrontal cortex and were not observed in the hippocampus, nor were they found with genetic risk for other neuropsychiatric or immune conditions. The study, posted as a preprint on bioRxiv, has not yet undergone peer review.
What's missing
As a preprint, this study has not yet undergone peer review. Key limitations include reliance on postmortem brain tissue, which introduces potential confounds such as cause of death, medication history, and tissue quality. The polygenic risk score thresholds used to define 'high' versus 'low' risk are not specified in the abstract, and the sample sizes for each group are not reported. It remains unclear whether the observed gene expression delays translate into measurable cognitive or behavioral differences in the high-risk individuals studied. The causal direction of the relationship between delayed GABAergic maturation and schizophrenia risk also cannot be established from this design.
What different sources said
- bioRxivCenter
Liquidity of gene co-expression trajectories across the lifespan highlights delayed maturation and the perinatal GABA switch in schizophrenia risk
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