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Structural Brain Connectivity as a Genetic Marker for Schizophrenia.

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Genetic factors significantly impact white matter integrity in schizophrenia, with reduced integrity in frontal and subcortical regions linked to disease risk. These findings highlight a novel genetic vulnerability marker for schizophrenia.

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Area of Science:

  • Neuroscience
  • Genetics
  • Psychiatry

Background:

  • Schizophrenia is associated with reduced white matter integrity, potentially impairing brain communication.
  • The influence of genetic predisposition on these white matter abnormalities remains unclear.

Purpose of the Study:

  • To investigate the association between white matter integrity and genetic liability for schizophrenia.

Main Methods:

  • Used diffusion-weighted imaging to assess white matter integrity (fractional anisotropy) in twins discordant for schizophrenia and healthy controls.
  • Applied structural equation modeling to quantify genetic and environmental contributions to brain connectivity and disease liability.

Main Results:

  • Lower global fractional anisotropy (FA) correlated with increased schizophrenia liability, largely explained by common genes (83.4%).
  • Genetic variation in global FA shared 8.1% with genetic variance in schizophrenia liability.
  • Reductions in frontal, striatal, and thalamic connectivity were associated with genetic liability.

Conclusions:

  • Global white matter integrity reductions in schizophrenia are primarily driven by genetic risk.
  • Genetic liability for schizophrenia is linked to decreased connectivity in frontal and subcortical regions.
  • Reduced white matter integrity may serve as a distinct genetic vulnerability marker for schizophrenia.