A combined study of genetic association and brain imaging on the DAOA gene in schizophrenia

Authors

  • Jun Chen,

    1. National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, Tsinghua University, Beijing, P.R. China
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  • Yong Xu,

    1. Department of Psychiatry, First Hospital of Shanxi Medical University, Taiyuan, P.R. China
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  • Juan Zhang,

    1. National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, Tsinghua University, Beijing, P.R. China
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  • Zhifen Liu,

    1. Department of Psychiatry, First Hospital of Shanxi Medical University, Taiyuan, P.R. China
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  • Cheng Xu,

    1. Department of MRI, Shanxi Provincial People's Hospital, Taiyuan, P.R. China
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  • Kerang Zhang,

    1. Department of Psychiatry, First Hospital of Shanxi Medical University, Taiyuan, P.R. China
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  • Yan Shen,

    1. National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, Tsinghua University, Beijing, P.R. China
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  • Qi Xu M.D., Ph.D.

    Corresponding author
    1. National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, Tsinghua University, Beijing, P.R. China
    • National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, Tsinghua University, No. 5 Dong Dan San Tiao, Beijing 100005, P.R. China.
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  • All the authors listed have read through the manuscript, approved for publication and declared no conflict of interest.

  • How to cite this article: Chen J, Xu Y, Zhang J, Liu Z, Xu C, Zhang K, Shen Y, Xu Q. 2013. A Combined Study of Genetic Association and Brain Imaging on the DAOA Gene in Schizophrenia. Am J Med Genet Part B 162B:191–200.

Abstract

While there has been no objective biomarker available for both diagnosis and prognosis of schizophrenia, compelling evidence suggests that the glutamatergic system may influence susceptibility to schizophrenia. To test genetic association of the glutamatergic system with schizophrenia and abnormal brain activities in resting-state patients with schizophrenia, a two-stage association study was performed in 454 patients and 480 controls, followed by regional homogeneity (ReHo) analysis of resting-state functional magnetic resonance imaging in 48 first-episode medication-free patients and 43 well-matched controls. The differences in ReHo between genotypes of interest were initially tested by the Student's t-test and the 2 × 2 (genotypes × disease status) ANOVA was then performed to identify the main effects of genotypes, disease status and their interactions in schizophrenia. The stage-1 study showed association of the DAOA and PSEN2 genes with schizophrenia in a small sample; the stage-2 study with an expanded sample confirmed the disease association for 2-SNP and 3-SNP haplotypes, and the cis-phase interactions between rs2391191 and some other SNPs in the DAOA gene. Four clusters with altered ReHo in the bilateral culmen, left putamen and left cuneus were associated with rs2391191. Main effects of rs2391191 genotypes were found in the left putamen. The left cuneus showed a genotype × disease status interaction. In conclusion, the DAOA gene may confer genetic risk of schizophrenia and associate with the altered ReHo in schizophrenia; genotype effect and its interaction with disease status may contribute to the altered ReHo, leading to specific ReHo in schizophrenic brain due to glutamatergic modulation. © 2013 Wiley Periodicals, Inc.

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