Department of Psychiatry, Washington University School of Medicine, St Louis
Department of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, Chicago
Department of Psychiatry, Washington University School of Medicine, St Louis
Department of Pathology and Anatomical Sciences, University of Missouri School of Medicine, Columbia
Department of Psychiatry, Washington University School of Medicine, St Louis
Center for Imaging Science, The Johns Hopkins University, Baltimore
Department of Psychiatry, Washington University School of Medicine and Department of Psychology, Washington University, St Louis
Department of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, Chicago, USA
Correspondence: Correspondence: Michael P. Harms, PhD, Department of Psychiatry (Box 8134), Washington University School of Medicine, 660 S. Euclid Ave, St Louis, MO 63110, USA. Email: mharms{at}conte.wustl.edu
Background
The relatives of individuals with schizophrenia exhibit deficits of overall frontal lobe volume, consistent with a genetic contribution to these deficits.
Aims
To quantify the structure of gyral-defined subregions of prefrontal cortex in individuals with schizophrenia and their siblings.
Method
Grey matter volume, cortical thickness, and surface area of the superior, middle and inferior frontal gyri were measured in participants with schizophrenia and their unaffected (non-psychotic) siblings (n = 26 pairs), and controls and their siblings (n = 40 pairs).
Results
Grey matter volume was reduced in the middle and inferior frontal gyri of individuals with schizophrenia, relative to controls. However, only inferior frontal gyrus volume was also reduced in the unaffected siblings of those with schizophrenia, yielding a volume intermediate between their affected siblings and controls.
Conclusions
The structure of subregions of the prefrontal cortex may be differentially influenced by genetic factors in schizophrenia, with inferior frontal gyrus volume being most related to familial risk.
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