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Xu H, Zhou Y, Xiu M, Chen D, Wang W, Wang L, Zhang X. The inconsistent mediating effect of catechol O methyl transferase Val 158Met polymorphism on the sex difference of cognitive impairment in schizophrenia patients. Front Psychiatry 2022; 13:993859. [PMID: 36203835 PMCID: PMC9531860 DOI: 10.3389/fpsyt.2022.993859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 09/02/2022] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE Schizophrenia is a multifaceted mental disorder characterized by heterogeneous positive/negative symptoms and cognitive deficits. Sex differences have been reported in various aspects of the disease. However, the underlying genetic reasons remain unelucidated. Recent studies show that the influence of COMT Val158Met (rs4680) variation is sexually dimorphic. Thus, this study aims to explore whether there is an effect of the interaction between COMT Val158Met (rs4680) polymorphism and sex on patients' clinical characteristics and cognitive function. MATERIALS AND METHODS We recruited 367 in patients with chronic schizophrenia (246 males and 121 females) and 419 healthy controls (172 males and 247 females). The cognitive performance was assessed by Repeatable Battery for the Assessment of Neuropsychological Status (RBANS), and the COMT Val158Met (rs4680) polymorphism is genotyped. The psychopathological symptoms of the patients were assessed by the Positive and Negative Syndrome Scale (PANSS). RESULTS We find that male patients had a significantly higher proportion of carrying the Val allele and Val/Val carriers exhibited more severe positive symptoms and cognitive impairment than Met carriers. COMT Val158Met (rs4680) polymorphism inconsistently mediated the relationship between sex and cognitive performance in schizophrenia patients. CONCLUSION These findings suggest that COMT Val158Met (rs4680) polymorphism is associated with the risk and severity of schizophrenia in a sexually dimorphic way and contributes more to the clinical symptoms and cognitive impairment in male patients with schizophrenia.
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Affiliation(s)
- Hang Xu
- CAS Key Laboratory of Mental Health, Institute of Psychology, Beijing, China
| | - Yongjie Zhou
- Department of Psychiatric Rehabilitation, Shenzhen Kangning Hospital, Shenzhen, Guangdong, China
| | - Meihong Xiu
- Beijing HuiLongGuan Hospital, Peking University, Beijing, China
| | - Dachun Chen
- Beijing HuiLongGuan Hospital, Peking University, Beijing, China
| | - Weiwen Wang
- CAS Key Laboratory of Mental Health, Institute of Psychology, Beijing, China.,Department of Psychology, University of Chinese Academy of Sciences, Beijing, China
| | - Li Wang
- CAS Key Laboratory of Mental Health, Institute of Psychology, Beijing, China.,Department of Psychology, University of Chinese Academy of Sciences, Beijing, China
| | - Xiangyang Zhang
- CAS Key Laboratory of Mental Health, Institute of Psychology, Beijing, China.,Department of Psychology, University of Chinese Academy of Sciences, Beijing, China
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Colloca L, Wang Y, Martinez PE, Christy Chang YP, Ryan KA, Hodgkinson C, Goldman D, Dorsey SG. OPRM1 rs1799971, COMT rs4680, and FAAH rs324420 genes interact with placebo procedures to induce hypoalgesia. Pain 2019; 160:1824-1834. [PMID: 31335650 PMCID: PMC6668362 DOI: 10.1097/j.pain.0000000000001578] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Genetics studies on the placebo hypoalgesic effect highlight a promising link between single nucleotide polymorphisms (SNPs) in the dopamine, opioid, and endocannabinoid genes and placebo hypoalgesia. However, epistasis and replication studies are missing. In this study, we expanded on previous findings related to the 3 SNPs in the opioid receptor mu subunit (OPRM1 rs1799971), catechol-O-methyltransferase (COMT rs4680), and fatty acid amide hydrolase (FAAH rs324420) genes associated with placebo hypoalgesia and tested the effect of a 3-way interaction on placebo hypoalgesia. Using 2 well-established placebo procedures (verbal suggestion and learning paradigm), we induced significant placebo hypoalgesic effects in 160 healthy participants. We found that individuals with OPRM1 AA combined with FAAH Pro/Pro and those carrying COMT met/met together with FAAH Pro/Pro showed significant placebo effects. Participants with COMT met/val alleles showed significant placebo effects independently of OPRM1 and FAAH allele combinations. Finally, the model that included the placebo procedure and genotypes predicted placebo responsiveness with a higher accuracy (area under the curve, AUC = 0.773) as compared to the SNPs alone indicating that genetic variants can only partially explain the placebo responder status. Our results suggest that the endogenous mu-opioid system with a larger activation in response to pain in the met/val allele carriers as well as the synergism between endogenous mu-opioid system and cannabinoids might play the most relevant role in driving hypoalgesic responses. Future epistasis studies with larger sample sizes will help us to fully understand the complexity of placebo effects and explain the mechanisms that underlie placebo responsiveness.
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Affiliation(s)
- Luana Colloca
- Department of Pain and Translational Symptom Science, School of Nursing, University of Maryland, Baltimore, USA
- Departments of Anesthesiology and Psychiatry, School of Medicine, University of Maryland, Baltimore, University of Maryland, Baltimore, USA
- Center to Advance Chronic Pain Research, University of Maryland, Baltimore, USA
| | - Yang Wang
- Department of Pain and Translational Symptom Science, School of Nursing, University of Maryland, Baltimore, USA
- Center to Advance Chronic Pain Research, University of Maryland, Baltimore, USA
| | | | | | | | - Colin Hodgkinson
- Laboratory of Neurogenetics, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD, 20892, USA
| | - David Goldman
- Laboratory of Neurogenetics, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD, 20892, USA
| | - Susan G. Dorsey
- Department of Pain and Translational Symptom Science, School of Nursing, University of Maryland, Baltimore, USA
- Departments of Anesthesiology and Psychiatry, School of Medicine, University of Maryland, Baltimore, University of Maryland, Baltimore, USA
- Center to Advance Chronic Pain Research, University of Maryland, Baltimore, USA
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3
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Gozukara Bag HG. Association between COMT gene rs165599 SNP and schizophrenia: A meta-analysis of case-control studies. Mol Genet Genomic Med 2018; 6:845-854. [PMID: 30165727 PMCID: PMC6160701 DOI: 10.1002/mgg3.468] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 07/26/2018] [Accepted: 08/09/2018] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND There are many studies with different results that examine the association between Catechol-O-MethylTransferase (COMT) gene single-nucleotide polymorphisms (SNPs) and schizophrenia. In this study, the aim was to conduct a meta-analysis to achieve a pooled effect size of the association between COMT gene rs165599 SNP and schizophrenia. METHODS Odds ratio (OR) was used as an effect size to determine the association between schizophrenia and the SNP. The pooled ORs were achieved under four different genetic models. When the heterogeneity among studies was high the DerSimonian-Laird random-effects model, otherwise the Mantel-Haenszel fixed-effects model was used. Publication bias was evaluated by Egger's test. RESULTS Under different genetic models no statistically significant association was found between rs165599 SNP and schizophrenia by meta-analyses consist of 20 independent studies. There was high heterogeneity among studies, for the possible reason the population differences, although the subgroup analyzes reduced the heterogeneity, no association was obtained. However, the sex-specific estimation of the females showed that to be a G allele carrier is a risk factor for schizophrenia (OR = 1.366 [95% confidence interval = 1.094-1.706]) compared to AA homozygous. CONCLUSION The COMT gene rs165599 SNP does not appear to be a single-risk factor for schizophrenia.
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Affiliation(s)
- Harika Gozde Gozukara Bag
- Faculty of Medicine, Department of Biostatistics & Medical Informatics, Inonu University, Malatya, Turkey
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4
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The Role of a Catechol-O-Methyltransferase (COMT) Val158Met Genetic Polymorphism in Schizophrenia: A Systematic Review and Updated Meta-analysis on 32,816 Subjects. Neuromolecular Med 2016; 18:216-31. [DOI: 10.1007/s12017-016-8392-z] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 03/19/2016] [Indexed: 12/31/2022]
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Zhang F, Liu C, Chen Y, Wang L, Lu T, Yan H, Ruan Y, Yue W, Zhang D. No association of catechol-O-methyltransferase polymorphisms with schizophrenia in the Han Chinese population. Genet Test Mol Biomarkers 2013; 16:1138-41. [PMID: 22963606 DOI: 10.1089/gtmb.2012.0061] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
AIMS Genetics play a major role in the etiology of schizophrenia (SZ). Catechol-O-methyltransferase (COMT) is one of the promising candidate genes for SZ. A nonsynonymous single-nucleotide polymorphism (SNP), rs4680, causing a Valine (Val) to Methionine (Met) substitution, has been widely studied in relation to psychiatric phenotypes, including SZ, but with conflicting results. We conducted a two-stage study to examine the association of COMT polymorphisms with SZ in the Han Chinese population. RESULTS Association analysis of nine SNPs in 768 patients and 1348 controls failed to detect any positive markers or haplotypes. Then, we tested rs4680 in a validation sample of 963 patients and 992 controls, and no significant association was observed, but the cases significantly deviated from Hardy-Weinberg equilibrium (p=5.7e-4). There was no association of rs4680 with SZ in the combined sample (n=4071, p=0.110, odds ratio=1.08). CONCLUSIONS Our results do not support the association of COMT with SZ in the Han Chinese population.
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Affiliation(s)
- Fuquan Zhang
- Institute of Mental Health, Peking University, Beijing, P.R. China.
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Li WJ, Kou CG, Yu Y, Sun S, Zhang X, Kosten TR, Zhang XY. Association of catechol-O-methyltransferase gene polymorphisms with schizophrenia and negative symptoms in a Chinese population. Am J Med Genet B Neuropsychiatr Genet 2012; 159B:370-5. [PMID: 22354729 PMCID: PMC4190670 DOI: 10.1002/ajmg.b.32038] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Accepted: 01/31/2012] [Indexed: 12/18/2022]
Abstract
The gene encoding Catechol-O-methyltransferase (COMT), a dopamine catabolic enzyme, has been associated inconsistently with schizophrenia in spite of consistent evidence for dopaminergic dysfunction in the prefrontal cortex (PFC) of schizophrenia. Since one contribution to this inconsistency might be genetic heterogeneity, this study investigated whether the COMT gene was associated with the development and symptoms of schizophrenia in relatively genetically homogeneous Chinese schizophrenic patients. We analyzed two polymorphisms (rs740603 and rs4818) of the COMT gene in a case-control study of 604 Han Chinese (284 patients and 320 controls). The patients' psychopathology was assessed using the Positive and Negative Syndrome Scale (PANSS). We found no significant differences in the rs740603 and rs4818 genotype and allele distributions between the patient and control groups. Quantitative trait analysis by the UNPHASED program showed that the rs740603 and rs740603(G)-rs4818(G) haplotypes were associated with negative symptoms in the schizophrenic patients, particularly among female patients. Thus, the COMT gene polymorphisms may not contribute to the susceptibility to schizophrenia, but may contribute to the negative symptoms of schizophrenia among Han Chinese.
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Affiliation(s)
- Wen Jun Li
- Department of Social Medicine and Health Management, Jilin University, Changchun, China
| | - Chang Gui Kou
- Department of Epidemiology and Health Statistics, Jilin University, Changchun, China
| | - Yaqin Yu
- Research Center for Neuroscience and MH Radiobiology Research Unit, Jilin University, Changchun, China,Corresponding Authors: Yaqin Yu is to be contacted at School of Public Health, Jilin University, Changchun, 130021, China. Tel.: +86 431 85619443. . T.R. Kosten and X.Y. Zhang are to be contacted at VA Medical Center, 2002 Holcombe Boulevard, Houston, Texas, 77030, USA. Tel: 7137947032; Fax: 713-794-7938. (T.R. Kosten), (X.Y. Zhang)
| | - Shilong Sun
- Research Center for Neuroscience and MH Radiobiology Research Unit, Jilin University, Changchun, China
| | - Xuan Zhang
- Research Center for Neuroscience and MH Radiobiology Research Unit, Jilin University, Changchun, China
| | - Thomas R Kosten
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA,Psychiatry Research Center, Beijing Hui-Long-Guan Hospital, Beijing, China,Corresponding Authors: Yaqin Yu is to be contacted at School of Public Health, Jilin University, Changchun, 130021, China. Tel.: +86 431 85619443. . T.R. Kosten and X.Y. Zhang are to be contacted at VA Medical Center, 2002 Holcombe Boulevard, Houston, Texas, 77030, USA. Tel: 7137947032; Fax: 713-794-7938. (T.R. Kosten), (X.Y. Zhang)
| | - Xiang Yang Zhang
- Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX, USA,Psychiatry Research Center, Beijing Hui-Long-Guan Hospital, Beijing, China,Corresponding Authors: Yaqin Yu is to be contacted at School of Public Health, Jilin University, Changchun, 130021, China. Tel.: +86 431 85619443. . T.R. Kosten and X.Y. Zhang are to be contacted at VA Medical Center, 2002 Holcombe Boulevard, Houston, Texas, 77030, USA. Tel: 7137947032; Fax: 713-794-7938. (T.R. Kosten), (X.Y. Zhang)
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Chen CY, Lu RB, Yeh YW, Shih MC, Huang SY. Association study of catechol-O-methyltransferase gene polymorphisms with schizophrenia and psychopathological symptoms in Han Chinese. GENES BRAIN AND BEHAVIOR 2011; 10:316-24. [PMID: 21255265 DOI: 10.1111/j.1601-183x.2010.00670.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Although dysfunction of catechol-O-methyltransferase (COMT)-mediated dopamine transmission is implicated in the etiology of schizophrenia, the human COMT gene has not been associated consistently with schizophrenia. The purpose of this study was to investigate whether the COMT gene is associated with the development of schizophrenia and whether the polymorphisms of this gene influence the psychopathological symptoms in patients with schizophrenia. Fourteen polymorphisms of the COMT gene were analyzed in a case-control study of 876 Han Chinese individuals (434 patients and 442 controls). All participants were screened using a Chinese version of the modified Schedule for Affective Disorders and Schizophrenia-Lifetime Version (SADS-L) and all patients met the criteria for schizophrenia. Furthermore, pretreatment of psychopathology was assessed using the Positive and Negative Syndrome Scale (PANSS) in a subset of 224 hospitalized schizophrenia patients, who were drug-naÏve or drug-free, to examine the association between clinical symptomatology and COMT polymorphisms. No significant differences in allele or genotype frequencies were observed between schizophrenia patients and controls, for all variants investigated. Haplotype analysis showed that three haplotype blocks of the COMT gene were not associated with the development of schizophrenia. Moreover, these COMT polymorphisms did not influence the PANSS scores of schizophrenia patients. This study suggests that the COMT gene may not contribute to the risk of schizophrenia and to the psychopathological symptoms of schizophrenia among Han Chinese.
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Affiliation(s)
- C-Y Chen
- Department of Psychiatry, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
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Costas J, Sanjuán J, Ramos-Ríos R, Paz E, Agra S, Ivorra JL, Páramo M, Brenlla J, Arrojo M. Heterozygosity at catechol-O-methyltransferase Val158Met and schizophrenia: new data and meta-analysis. J Psychiatr Res 2011; 45:7-14. [PMID: 20488458 DOI: 10.1016/j.jpsychires.2010.04.021] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2009] [Revised: 04/20/2010] [Accepted: 04/20/2010] [Indexed: 12/31/2022]
Abstract
Catechol-O-methyltransferase (COMT) has been largely studied in relation to schizophrenia susceptibility. Most studies focused on the functional single nucleotide polymorphism (SNP) rs4680 that causes a substitution of Val by Met at codon 158 of the COMT protein. Recent meta-analyses do not support an association between allelic variants at rs4680 and schizophrenia. However, the putative role of overdominance has not been tested in meta-analyses, despite its biological plausibility. In this work, we tested the overdominant model in two Spanish samples (from Valencia and Santiago de Compostela), representing a total of 762 schizophrenic patients and 1042 controls, and performed a meta-analysis of the available studies under this model. A total of 51 studies comprising 13,894 schizophrenic patients and 16,087 controls were included in the meta-analysis, that revealed a small but significant protective effect for heterozygosity at rs4680 (pooled OR=0.947, P=0.023). Post-hoc analysis on southwestern European samples suggested a stronger effect in these populations (pooled OR=0.813, P=0.0009). Thus, the COMT functional polymorphism rs4680 contributes to schizophrenia genetic susceptibility under an overdominant model, indicating that both too high and too low levels of dopamine (DA) signalling may be risk factors. This effect can be modulated by genetic background.
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Affiliation(s)
- Javier Costas
- Fundación Pública Galega de Medicina Xenómica-SERGAS, Complexo Hospitalario Universitario de Santiago, Edif. Consultas Planta 2, E-15706 Santiago de Compostela, Spain.
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Kang C, Xu X, Liu H, Yang J. Association study of catechol-O-methyltransferase (COMT) gene Val158Met polymorphism with auditory P300 in Chinese Han patients with schizophrenia. Psychiatry Res 2010; 180:153-5. [PMID: 20483173 DOI: 10.1016/j.psychres.2008.07.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Revised: 06/24/2008] [Accepted: 07/22/2008] [Indexed: 11/16/2022]
Abstract
Several studies have reported associations between catechol-O-methyltransferase (COMT) gene Val158Met polymorphism and P300 event-related potentials in schizophrenic patients. But there has been no research to study the association between the P300 component and the Val158Met polymorphism in Chinese Han schizophrenia patients. Therefore, the present article was aimed at investigating the relationship of the Val158Met polymorphism with P300 in Chinese schizophrenic patients. The Val158Met polymorphism was detected by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) in 287 schizophrenia patients and 84 healthy control subjects. P300 recordings were obtained in a subsample. A significant difference was not observed between the patients and control subjects in the genotype distributions and allele frequencies. P300 amplitude in schizophrenia patients was significantly lower than that of controls. The P300 latency in schizophrenia patients was also significantly longer than that of controls. The P300 latency of Met homozygotes was significantly shorter than that of Val/Met and of Val/Val carriers at Cz and Pz. The latency of Val/Met carriers was significantly shorter than that of Val/Val carriers at Pz. The results did not suggest an association between the polymorphism in the COMT gene and susceptibility to schizophrenia in the Chinese Han population. However, the COMT Val158Met polymorphism might be a susceptibility variant for P300 abnormality in Chinese Han schizophrenia.
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Affiliation(s)
- ChuanYuan Kang
- Department of Psychiatry, The First Affiliated Hospital of Kunming Medical College, Kunming 650032, China
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10
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Kang CY, Xu XF, Shi ZY, Yang JZ, Liu H, Xu HH. Interaction of catechol-O-methyltransferase (COMT) Val108/158 Met genotype and risperidone treatment in Chinese Han patients with schizophrenia. Psychiatry Res 2010; 176:94-5. [PMID: 20053459 DOI: 10.1016/j.psychres.2009.02.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2008] [Revised: 02/08/2009] [Accepted: 02/18/2009] [Indexed: 10/20/2022]
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Chien YL, Liu CM, Fann CSJ, Liu YL, Hwu HG. Association of the 3' region of COMT with schizophrenia in Taiwan. J Formos Med Assoc 2009; 108:301-9. [PMID: 19369177 DOI: 10.1016/s0929-6646(09)60070-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND/PURPOSE The Val108/158Met (rs4680) single nucleotide polymorphism (SNP) in the catechol-O-methyltransferase (COMT) gene contributes to genetic susceptibility to schizophrenia, which is specifically related to impairments in executive functioning. A different genomic region composed of three SNPs (rs737865, rs4680, rs165599) within the COMT gene has been reported to be significantly associated with schizophrenia in Ashkenazi Jews. This study aims to clarify the association between these three SNPs and their haplotypes with schizophrenia and neurocognitive functioning, using both case-control and family-based designs. METHODS The case-control study included 124 schizophrenia patients and 112 healthy controls, while the family samples included 83 families with at least two affected siblings. The neurocognitive functioning was assessed by the Continuous Performance Test (CPT) and Wisconsin Card Sorting Test. The association analysis was performed using TRANSMIT and FBAT. RESULTS There was no significant association between the three SNPs and schizophrenia in the case-control study. In the family study, the A allele of rs165599 was transmitted preferentially to the affected individuals (p = 0.023), and significantly associated with a later age of onset (p = 0.018), more severe delusion/hallucination symptom dimension (p = 0.027), and poorer performance in the CPT (p = 0.04). The triple SNP haplotypes did not reveal any significant association with schizophrenia or neurocognitive function. CONCLUSION The SNP rs165599, which has been mapped to the 3'-UTR region of the COMT gene, was significantly associated with schizophrenia in our family study, and possibly associated with the age of onset, delusion/hallucination symptom dimension, and CPT performance. Therefore, COMT may contribute to the genetic risk for schizophrenia not through the Val108/158Met polymorphism, but through other variants that are situated 3' to this region, in the Taiwanese population. Nevertheless, the true associated functional variants in our subjects remain to be elucidated.
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Affiliation(s)
- Yi-Ling Chien
- Department of Psychiatry, National Taiwan University Hospital, Yun Lin Branch, Yunlin, Taiwan
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12
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Okochi T, Ikeda M, Kishi T, Kawashima K, Kinoshita Y, Kitajima T, Yamanouchi Y, Tomita M, Inada T, Ozaki N, Iwata N. Meta-analysis of association between genetic variants in COMT and schizophrenia: an update. Schizophr Res 2009; 110:140-8. [PMID: 19329282 DOI: 10.1016/j.schres.2009.02.019] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2008] [Revised: 02/14/2009] [Accepted: 02/22/2009] [Indexed: 01/05/2023]
Abstract
A common functional polymorphism, Val108/158Met (rs4680), and haplotypes rs737865-rs4680-rs165599 in the Catechol-O-methyltransferase gene (COMT) have been extensively examined for association to schizophrenia; however, results of replication studies have been inconsistent. The aim of this study was to comprehensively evaluate the genetic risk of COMT for schizophrenia. First, we performed a mutation scan to detect the existence of potent functional variants in the 5'-flanking and exon regions. Second, we conducted a gene-based case-control study between tagging single nucleotide polymorphisms (SNPs) in COMT [19 SNPs including six possible functional SNPs (rs2075507, rs737865, rs4680, rs165599, rs165849)] and schizophrenia in large Japanese samples (schizophrenics 1118, controls 1100). Lastly, we carried out a meta-analysis of 5 functional SNPs and haplotypes (rs737865-rs4680-rs165599). No novel functional variant was detected in the mutation scan. There is no association between these tagging SNPs in COMT and Japanese schizophrenia. In this updated meta-analysis, no evidence was found for an association between Val108/158Met polymorphisms, rs6267, rs165599, and haplotypes (rs7378655-rs4680-rs165599) and schizophrenia, although rs2075507 and rs737865 showed trends for significance in allele-wise analyses (P=0.039 in a multiplicative model, P=0.025 in a recessive model for rs2075507, P=0.018 in a dominant model for rs737865, uncorrected). This significance did not remain, however, after correcting the P-values using a false discovery rate controlling procedure. Our results suggest that the COMT is unlikely to contribute to susceptibility to schizophrenia.
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Affiliation(s)
- Tomo Okochi
- Department of Psychiatry, Fujita Health University School of Medicine, Toyoake, Aichi 470-1192, Japan
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Liao SY, Lin SH, Liu CM, Hsieh MH, Hwang TJ, Liu SK, Guo SC, Hwu HG, Chen WJ. Genetic variants in COMT and neurocognitive impairment in families of patients with schizophrenia. GENES BRAIN AND BEHAVIOR 2008; 8:228-37. [PMID: 19077118 DOI: 10.1111/j.1601-183x.2008.00467.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
This study examined the relations of genetic variants in catechol-O-methyltransferase (COMT) gene, including rs737865 in intron 1, rs4680 in exon 4 (Val158Met) and downstream rs165599, to schizophrenia and its related neurocognitive functions in families of patients with schizophrenia. Totally, 680 individuals from 166 simplex (166 affected members and 354 nonpsychotic first-degree relatives) and 46 multiplex families (85 affected members and 75 nonpsychotic first-degree relatives) were interviewed using Diagnostic Interview for Genetic Studies, administered Wisconsin Card Sorting Test (WCST) and Continuous Performance Test (CPT), and drawn for venous blood. Both categorical (dichotomizing families on affected members' neurocognitive performance) and quantitative approaches toward the WCST and CPT performance scores were employed using the family-based association test and the variance components framework, respectively. Both false discovery rate and permutations were used to adjust for multiple testing. The genotypes of rs4680 were associated with both the WCST and CPT performance scores in these families, but not with schizophrenia per se in either whole sample or subgroup analyses. Meanwhile, the other two single nucleotide polymorphisms were differentially associated with the two tasks. For WCST indexes, regardless of subgroup analyses or quantitative approach, only rs737865 exhibited moderate associations. For CPT indexes, rs737865 exhibited association for the subgroup with deficit on CPT reaction time, whereas rs165599 exhibited association for the subgroup with deficit on CPT d' as well as quantitative undegraded d'. Our results indicate that the genetic variants in COMT might be involved in modulation of neurocognitive functions and hence conferring increased risk to schizophrenia.
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Affiliation(s)
- S-Y Liao
- Genetic Epidemiology Core Laboratory, Division of Genomic Medicine Research Center for Medical Excellence, School of Medicine, College of Medicine and National Taiwan University Hospital, National Taiwan University, Taipei, Taiwan
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Abstract
This article provides an overview of the past year's literature on schizophrenia genetics. Quantitative genetics continues to be an important foundation in which family and twin studies have been used to evaluate potential endophenotypes. Research in molecular genetics has focused on detecting multiple genes of small effect, and developments relating to key positional and functional candidate genes are reviewed. Large-scale, multicenter studies are proving to be important in this quest. Research using neuroimaging and animal modeling studies continues to link genotype with phenotype. It is increasingly apparent that some candidate genes considered important in schizophrenia are likely to be relevant to the etiology of other psychotic disorders, including bipolar disorder. This notion may challenge traditional disease classifications, not only in research but potentially in clinical practice.
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