Abstract
The etiology of schizophrenia is unclear, although family, twin, and linkage studies implicate genetic factors. Here, we identified adenomatous polyposis coli (APC), a tumor suppressor gene, as a risk factor for schizophrenia. We compared leukocytic gene expression patterns of six pairs of patients with schizophrenia and healthy controls by microarray. APC expression levels were significantly increased in all patients compared to healthy controls. To confirm the findings of microarray analysis, we measured expression levels of APC in the leukocytes from 30 relapse patients taking antipsychotic medication, 29 first-episode drug-naïve patients, and 30 healthy controls using real-time quantitative reverse transcription (RT)-polymerase chain reaction (PCR). APC expression levels were significantly increased in leukocytes of schizophrenics both taking and not taking antipsychotic medication and hence the increase of APC expression was not due to antipsychotic medication. APC is located at 5q21–22, which has been previously reported to be linked with schizophrenia. Further, we performed the transmission disequilibrium test (TDT) and TDT based on haplotypes to search for the association between schizophrenia and APC by examining 163 parent–offspring trios of Chinese descent. We analyzed three single-nucleotide polymorphisms (SNPs) (rs2229992, rs42427, rs465899) at the exon region of APC. TDT showed that the three SNPs are significantly associated with schizophrenia (TDT χ2=4.23, P<0.05; 4.15, P<0.05; 8.49 P<0.01, respectively; HHRRχ2=5.54, P<0.05; 4.40, P<0.05; 9.79, P<0.01, respectively). We found a significant association between the APC haplotypes from rs2229992–rs42427–rs465899 and schizophrenia (Global χ2=44.376,df=7, P<0.001). The C–A–T haplotype has a frequency of more than 57% and has a strong association with schizophrenia (χ2=15.04, P<0.001). These results indicate that the APC may be a candidate gene conferring susceptibility to schizophrenia and also may be associated with reduced vulnerability to cancer in schizophrenia.
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Acknowledgements
This research was supported by the Shanghai Mental Health Center. We thank the Health Science Center of Chinese Academy of Sciences, and Xi'an Jiaotong University. We also thank Professors SB Li, Dr TB Jin, Dr GW Xu, Ms YP Qian, and Mr DX Wang for help with data analysis and experiment, and Dr XD Wu for his helpful suggestions. Lastly, we especially thank anonymous reviewers for their constructive comments.
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Cui, D., Jiang, K., Jiang, S. et al. The tumor suppressor adenomatous polyposis coli gene is associated with susceptibility to schizophrenia. Mol Psychiatry 10, 669–677 (2005). https://doi.org/10.1038/sj.mp.4001653
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DOI: https://doi.org/10.1038/sj.mp.4001653
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