Abstract
The rs1076560 polymorphism of DRD2 (encoding dopamine receptor D2) is associated with alternative splicing and cognitive functioning; however, a mechanistic relationship to schizophrenia has not been shown. Here, we demonstrate that rs1076560(T) imparts a small but reliable risk for schizophrenia in a sample of 616 affected families and five independent replication samples totaling 4017 affected and 4704 unaffected individuals (odds ratio=1.1; P=0.004). rs1076560(T) was associated with impaired verbal fluency and comprehension in schizophrenia but improved performance among healthy comparison subjects. rs1076560(T) also associated with lower D2 short isoform expression in postmortem brain. rs1076560(T) disrupted a binding site for the splicing factor ZRANB2, diminished binding affinity between DRD2 pre-mRNA and ZRANB2 and abolished the ability of ZRANB2 to modulate short:long isoform-expression ratios of DRD2 minigenes in cell culture. Collectively, this work implicates rs1076560(T) as one possible risk factor for schizophrenia in the Han Chinese population, and suggests molecular mechanisms by which it may exert such influence.
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Acknowledgements
We thank Allison Brown and Maura Regan at the HPCGG for coordinating and performing the genotyping for this project, and Sharon Chandler at UCSD and Jessica Lasky-Su at Harvard Medical School for technical assistance. We further thank our research and clinical collaborators in the Taiwan Schizophrenia Linkage Study Group, including Chih-Min Liu, Wei J Chen, Ming-Ming Tsuang, Shih-Kai Liu, Ming-Hsien Shieh, Tzung-Jeng Hwang, Wen-Chen Ou-Yang, Chun-Ying Chen, Chwen-Cheng Chen, Jin-Jia Lin, Frank Huang-Chih Chou, Ching-Mo Chueh, Wei-Ming Liu, Mei-Hua Hall, Chiao-Chicy Chen, Jia-Jiu Lo, Jia-Fu Lee, Seng Shen, Yung Feng, Shin-Pin Lin, Shi-Chin Guo, Ming-Cheng Kuo, Liang-Jen Chuo, Chih-Pin Lu, Deng-Yi Chen, Huan-Kwang Ferng, Nan-Ying Chiu, Wen-Kun Chen, Tien-Cheng Lee, Hsin-Pei Tang, Yih-Dar Lee, Wu-Shih Wang, For-Wey Long, Tiao-Lai Huang, Jung-Kwang Wen, Cheng-Sheng Chen, Wen-Hsiang Huang, Shu-Yu Yang and Cheng-Hsing Chen. We also thank the hospitals that participated in this study, including National Taiwan University Hospital and Medical College of National Taiwan University, National Taoyuan Psychiatric Center, National Tsaotun Psychiatric Center, National Cheng-Kung University, Kai-Suan Psychiatric Hospital of Kaohsiung City, Yu-Li Veterans Hospital and National Yu-Li Hospital. We also thank Dr Wolfgang Sadee for generously providing DRD2 minigene constructs. This work was supported in part by grant R01MH085521 (SJG) from the US National Institutes of Health; a Young Investigator Award, an Independent Investigator Award, and the Sidney R Baer, Jr Prize for Schizophrenia Research (SJG) from NARSAD: The Brain and Behavior Research Fund; and a Research Grant from The Gerber Foundation (SJG); as well as the National Health Research Institute of Taiwan (90-8825PP and 91,92-9113PP), National Taiwan University (97R00066-47,48) and the Genomic Medicine Research Program of Psychiatric Disorders of National Taiwan University Hospital, the National Research Program for Genomic Medicine of the National Science Council of Taiwan (NSC-94-3112-B-002; NSC-95-3112-B-002-011; NSC-96-3112-B-002-011; NSC-97-3112-B-002-046), the National Natural Science Foundation of China (30530290, 30870896), the National High Technology Research and Development Program of China (2006AA02Z195, 2008AA02Z401), the National Basic Research Program of China (2007CB512301), the National Health Research Institutes of Zhunan, Taiwan, the National Program 863 (2006AA02A407) of China, the National 973 Program of China (2004CB518601), and the International S&T Cooperation Program of China (2006DFA31440). Cynthia Shannon Weickert is supported by the Schizophrenia Research Institute (utilizing infrastructure funding from the NSW Ministry of Health and the Macquarie Group Foundation), the University of New South Wales, and Neuroscience Research Australia. Cynthia Shannon Weickert is a recipient of a National Health and Medical Research Council (Australia) Senior Research Fellowship.
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Cohen, O., Weickert, T., Hess, J. et al. A splicing-regulatory polymorphism in DRD2 disrupts ZRANB2 binding, impairs cognitive functioning and increases risk for schizophrenia in six Han Chinese samples. Mol Psychiatry 21, 975–982 (2016). https://doi.org/10.1038/mp.2015.137
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DOI: https://doi.org/10.1038/mp.2015.137
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