Background-A number of studies have provided evidence for genetic modulation of brain structure in unaffected family members of schizophrenia patients (FM), using conventional regionof-interest volumetric analysis. High-dimensional pattern analysis and classification methods have been reported recently to have the capacity to determine subtle and spatially complex structural patterns that distinguish schizophrenia patients from healthy controls, using standard magnetic resonance imaging (MRI). This study investigates whether such endophenotypic patterns are found in FM via similar computer-based image analysis approaches.Correspond to: Christos Davatzikos, Professor, Department of Radiology, University of Pennsylvania, 3600 Market street, Suite 380, Philadelphia, PA 19104, Tel: 215-349-8587, Fax: 215-614-0266, E-Mail: christos@rad.upenn.edu. Financial Disclosures: There are no conflicts of interest including any financial, personal or other relationships with people or organizations, by any of the co-authors, related to the work described in the paper.Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
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NIH-PA Author ManuscriptMethods-A high-dimensional pattern classifier was constructed from a group of 69 patients and 79 healthy controls, via an analysis that identified a subtle, and spatially complex and distributed pattern of reduced brain volumes. Patients were distinguished from healthy controls with sensitivity of 92.9% and specificity 89.8%, using jackknife method. Then the constructed classifier was applied to examine brain structure of 30 FM.Results-The classifier indicated that family members had structural profiles highly overlapping with those of patients. Moreover, an orbitofrontal region of relatively increased white matter was found to contribute significantly to the classification, indicating that white matter alterations, along with reductions of gray matter volumes, might be present in patients and unaffected family members.Conclusions-These findings give evidence that high-dimensional pattern analysis and classification can identify complex and subtle structural endophenotypes that are shared by probands and their unaffected family members.