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Disturbed structural connectivity in schizophrenia primary factor in pathology or epiphenomenon?
Andreas Konrad1, Georg Winterer
1Department of Psychiatry, Johannes Gutenberg-University, Mainz, Germany. andreas_konrad@gmx.de
Schizophrenia Bulletin
|May 9, 2007
Summary
Schizophrenia may involve disrupted brain wiring, particularly in white matter tracts. New imaging techniques and genetic studies suggest abnormalities in myelin, a key component of nerve fibers, warranting further investigation.
Area of Science:
- Neuroscience
- Psychiatry
- Neuroimaging
Background:
- Schizophrenia is associated with indirect evidence of disrupted structural connectivity in subcortical fiber tracts.
- Previous functional neuroimaging and electrophysiologic studies suggest white matter abnormalities.
Purpose of the Study:
- To directly investigate fiber tract abnormalities in schizophrenia using advanced structural imaging techniques.
- To explore the role of myelination and related genetic factors in schizophrenia's structural connectivity deficits.
Main Methods:
- Utilized diffusion tensor imaging (DTI) and magnetization transfer imaging (MTI) for direct structural investigation.
- Reviewed postmortem studies examining myelination and oligodendroglial cells.
- Examined the expression of myelin-related genes, such as Neuregulin (NRG1) and its receptors.
Main Results:
- Findings from DTI and MTI studies are currently inconsistent, possibly due to methodological limitations and small sample sizes.
- Postmortem studies reveal reduced oligodendroglial cells and altered myelin sheaths in schizophrenia.
- Altered expression of the NRG1 receptor, erbB3, is observed in schizophrenia patients, with NRG1 implicated in genetic risk.
Conclusions:
- Increasing evidence suggests pathological changes in structural connectivity in schizophrenia.
- It remains unclear whether these alterations are primary risk factors or secondary consequences of neuronal dysfunction.
- Future research is needed to elucidate the causal relationship between structural connectivity changes and schizophrenia pathogenesis.
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