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Ghamari R, Yazarlou F, Khosravizadeh Z, Moradkhani A, Abdollahi E, Alizadeh F. Serotonin transporter functional polymorphisms potentially increase risk of schizophrenia separately and as a haplotype. Sci Rep 2022; 12:1336. [PMID: 35079035 PMCID: PMC8789837 DOI: 10.1038/s41598-022-05206-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Accepted: 01/10/2022] [Indexed: 11/10/2022] Open
Abstract
Schizophrenia is a severe, disabling psychiatric disorder with unclear etiology. Family-based, twins, and adoption studies have shown that genetic factors have major contributions in schizophrenia occurrence. Until now, many studies have discovered the association of schizophrenia and its comorbid symptoms with functional polymorphisms that lie within serotonin reuptake pathway genes. Here, we aimed to investigate the association of three variable number tandem repeats (VNTR) functional polymorphisms in MAOA and SLC6A4 with schizophrenia in the Iranian population. Two hundred and forty-one subjects with schizophrenia and three hundred and seventy age and sex-matched healthy controls were genotyped for MAOA promoter uVNTR, 5-HTTLPR, and STin2 polymorphisms. Genotyping was performed by polymerase chain reaction (PCR) with locus-specific primers and running the PCR product on agarose 2.5% gel electrophoresis. Finally, the statistical inference was performed using R programming language and Haploview software. MAOA promoter uVNTR analysis of allele frequency showed no differences between schizophrenia subjects and healthy controls in both males and females and no significant differences were observed between female cases and female controls in MAOA promoter uVNTR 4 repeat frequency. Also, there were no differences between Schizophrenia and healthy control groups in 5-HTTLPR allele and genotype frequency but, 5-HTTLPR S allele carriers are significantly more frequent among cases. In addition, STin2.12 repeats were significantly more frequent among schizophrenia patients. Genotype comparison suggested that 5-HTTLPR S allele and STin2.12 repeat carriers were significantly more frequent among schizophrenia cases and being STin2.12 repeat carrier significantly increase the risk of schizophrenia occurrence. Besides, analysis of haplotype showed stronger linkage disequilibrium between 5-HTTLPR and STin2 haplotype block in cases than controls. These results suggest that SLC6A4 functional polymorphisms potentially could play a possible role as risk factors for the incidence of schizophrenia.
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Affiliation(s)
- Rana Ghamari
- Department of Genetics, Faculty of Biology, Kharazmi University, Tehran, Iran
| | - Fatemeh Yazarlou
- Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Zahra Khosravizadeh
- Clinical Research Development Unit, Infertility treatment clinic, Amiralmomenin Hospital, Arak University of Medical Sciences, Arak, Iran
| | - Atefeh Moradkhani
- Department of Biology, Faculty of Science, Zanjan Branch, Islamic Azad University, Zanjan, Iran
| | - Elaheh Abdollahi
- Department of Medical Genetics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Fatemeh Alizadeh
- Department of Genomic Psychiatry and Behavioral Genomics (DGPBG), Roozbeh Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
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Xu FL, Wang BJ, Yao J. Association between the SLC6A4 gene and schizophrenia: an updated meta-analysis. Neuropsychiatr Dis Treat 2019; 15:143-155. [PMID: 30643413 PMCID: PMC6314053 DOI: 10.2147/ndt.s190563] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND In order to explore the association between the SLC6A4 gene and the risk of schizophrenia, an updated meta-analysis was conducted using a total of 46 scientific articles. METHODS Through a literature search, papers studied included 35 articles on serotonin-transporter-linked polymorphic region (5-HTTLPR) with 8,752 cases and 10,610 controls, 17 articles on second intron variable number of tandem repeats with 7,284 cases and 8,544 controls, four studies on rs1042173 with 1,351 cases and 2,101 controls, and four studies on rs140700 with 1,770 cases and 2,386 controls. Pooled, subgroup, and sensitivity analyses were performed, and the results were visualized by forest and funnel plots. RESULTS An association between 5-HTTLPR and the risk of schizophrenia was not found, except for an Indian subgroup analysis (Pz =0.014, OR =1.749, 95% CI =1.120-2.731). A 10 repeats/12 repeats (10R/12R) genotype was a protective factor against schizophrenia (Pz =0.020, OR =0.789, 95% CI =0.646-0.963), but a 12R/12R genotype was a risk factor for schizophrenia (Pz =0.004, OR =1.936, 95% CI =1.238-3.029) in the pooled analyses. In Caucasians, a GG genotype of rs1042173 may be a risk factor for schizophrenia (Pz =0.006, OR =1.299, 95% CI =1.079-1.565). No association was found between rs140700 and the risk for schizophrenia. CONCLUSION Through meta-analysis, we were able to gain insight into previously reported associations between SLC6A4 polymorphism and schizophrenia.
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Affiliation(s)
- Feng-Ling Xu
- School of Forensic Medicine, China Medical University, Shenyang 110122, People's Republic of China, ;
| | - Bao-Jie Wang
- School of Forensic Medicine, China Medical University, Shenyang 110122, People's Republic of China, ;
| | - Jun Yao
- School of Forensic Medicine, China Medical University, Shenyang 110122, People's Republic of China, ;
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Xie J, Gizatullin R, Vukojevic V, Leopardi R. The CCDC55 couples cannabinoid receptor CNR1 to a putative DISC1 schizophrenia pathway. Neuroscience 2015; 310:723-30. [PMID: 26475744 DOI: 10.1016/j.neuroscience.2015.10.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 10/08/2015] [Accepted: 10/08/2015] [Indexed: 10/22/2022]
Abstract
PURPOSE Our previous study suggested that the coiled coil domain-containing 55 gene (CCDC55), also named as NSRP1 (nuclear speckle splicing regulatory protein 1 (NSRP1)), was encompassed in a haplotype block spanning over the serotonin transporter (5-HTT) gene in patients with schizophrenia (SCZ). However, the neurobiological function of CCDC55 gene remains unknown. This study aims to uncover the potential role of CCDC55 in SCZ-associated molecular pathways. EXPERIMENTAL DESIGN Using molecular cloning, sequencing and immune blotting to identify basic properties, yeast two-hybrid screening and glutathione S-transferase (GST) pull-down assay to test protein-protein interaction, and confocal laser scanning microscopy (CSLM) to show intracellular interaction of proteins. PRINCIPAL FINDINGS (i) CCDC55 is expressed as a nuclear protein in human neuronal cells; (ii) Protein-protein interaction analyses showed CCDC55 physically interacted with Ran binding protein 9 (RanBP9) and disrupted in schizophrenia 1 (DISC1); (iii) CCDC55 and RanBP9 co-localized in the nucleus of human neuronal cells; (iv) CCDC55 also interacted with the cannabinoid receptor 1 (CNR1), and with the brain cannabinoid receptor-interacting protein 1a (CNRIP1a); (v) CNR1 activation in differentiated human neuronal cells resulted in an altered RanBP9 localization. CONCLUSION CCDC55 may be involved in a functional bridging between the CNR1 activation and the DISC1/RanBP9-associated pathways.
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Affiliation(s)
- J Xie
- Center for Molecular Medicine, Karolinska Institute, Stockholm, Sweden; Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden.
| | - R Gizatullin
- Center for Molecular Medicine, Karolinska Institute, Stockholm, Sweden; Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - V Vukojevic
- Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
| | - R Leopardi
- Center for Molecular Medicine, Karolinska Institute, Stockholm, Sweden; Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
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Besèr A, Sorjonen K, Wahlberg K, Peterson U, Nygren A, Asberg M. Construction and evaluation of a self rating scale for stress-induced exhaustion disorder, the Karolinska Exhaustion Disorder Scale. Scand J Psychol 2013; 55:72-82. [PMID: 24236500 PMCID: PMC4235404 DOI: 10.1111/sjop.12088] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Accepted: 09/01/2013] [Indexed: 12/01/2022]
Abstract
Prolonged stress (≥ six months) may cause a condition which has been named exhaustion disorder (ED) with ICD-10 code F43.8. ED is characterised by exhaustion, cognitive problems, poor sleep and reduced tolerance to further stress. ED can cause long term disability and depressive symptoms may develop. The aim was to construct and evaluate a self-rating scale, the Karolinska Exhaustion Disorder Scale (KEDS), for the assessment of ED symptoms. A second aim was to examine the relationship between self-rated symptoms of ED, depression, and anxiety using KEDS and the Hospital Anxiety and Depression Scale (HAD). Items were selected based on their correspondence to criteria for ED as formulated by the Swedish National Board of Health and Welfare (NBHW), with seven response alternatives in a Likert-format. Self-ratings performed by 317 clinically assessed participants were used to analyse the scale’s psychometric properties. KEDS consists of nine items with a scale range of 0–54. Receiver operating characteristics analysis demonstrated that a cut-off score of 19 was accompanied by high sensitivity and specificity (each above 95%) in the discrimination between healthy subjects and patients with ED. Reliability was satisfactory and confirmatory factor analysis revealed that ED, depression and anxiety are best regarded as different phenomena. KEDS may be a useful tool in the assessment of symptoms of Exhaustion Disorder in clinical as well as research settings. There is evidence that the symptom clusters of ED, anxiety and depression, respectively, reflect three different underlying dimensions.
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Affiliation(s)
- Aniella Besèr
- Division of Rehabilitation Medicine, Danderyd Hospital, Stockholm, Sweden
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Song C, Chen GK, Millikan RC, Ambrosone CB, John EM, Bernstein L, Zheng W, Hu JJ, Ziegler RG, Nyante S, Bandera EV, Ingles SA, Press MF, Deming SL, Rodriguez-Gil JL, Chanock SJ, Wan P, Sheng X, Pooler LC, Van Den Berg DJ, Le Marchand L, Kolonel LN, Henderson BE, Haiman CA, Stram DO. A genome-wide scan for breast cancer risk haplotypes among African American women. PLoS One 2013; 8:e57298. [PMID: 23468962 PMCID: PMC3585353 DOI: 10.1371/journal.pone.0057298] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Accepted: 01/23/2013] [Indexed: 12/03/2022] Open
Abstract
Genome-wide association studies (GWAS) simultaneously investigating hundreds of thousands of single nucleotide polymorphisms (SNP) have become a powerful tool in the investigation of new disease susceptibility loci. Haplotypes are sometimes thought to be superior to SNPs and are promising in genetic association analyses. The application of genome-wide haplotype analysis, however, is hindered by the complexity of haplotypes themselves and sophistication in computation. We systematically analyzed the haplotype effects for breast cancer risk among 5,761 African American women (3,016 cases and 2,745 controls) using a sliding window approach on the genome-wide scale. Three regions on chromosomes 1, 4 and 18 exhibited moderate haplotype effects. Furthermore, among 21 breast cancer susceptibility loci previously established in European populations, 10p15 and 14q24 are likely to harbor novel haplotype effects. We also proposed a heuristic of determining the significance level and the effective number of independent tests by the permutation analysis on chromosome 22 data. It suggests that the effective number was approximately half of the total (7,794 out of 15,645), thus the half number could serve as a quick reference to evaluating genome-wide significance if a similar sliding window approach of haplotype analysis is adopted in similar populations using similar genotype density.
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Affiliation(s)
- Chi Song
- Department of Preventive Medicine, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
| | - Gary K. Chen
- Department of Preventive Medicine, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
| | - Robert C. Millikan
- Department of Epidemiology, Gillings School of Global Public Health, and Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | - Christine B. Ambrosone
- Department of Cancer Prevention and Control, Roswell Park Cancer Institute, Buffalo, New York, United States of America
| | - Esther M. John
- Cancer Prevention Institute of California, Fremont, California, United States of America
- Stanford University School of Medicine and Stanford Cancer Institute, Stanford, California, United States of America
| | - Leslie Bernstein
- Division of Cancer Etiology, Department of Population Science, Beckman Research Institute, City of Hope, Duarte, California, United States of America
| | - Wei Zheng
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, and Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Jennifer J. Hu
- Sylvester Comprehensive Cancer Center and Department of Epidemiology and Public Health, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Regina G. Ziegler
- Epidemiology and Biostatistics Program, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Sarah Nyante
- Department of Epidemiology, Gillings School of Global Public Health, and Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina, United States of America
| | - Elisa V. Bandera
- The Cancer Institute of New Jersey, New Brunswick, New Jersey, United States of America
| | - Sue A. Ingles
- Department of Preventive Medicine, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
| | - Michael F. Press
- Department of Pathology, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
| | - Sandra L. Deming
- Division of Epidemiology, Department of Medicine, Vanderbilt Epidemiology Center, and Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Jorge L. Rodriguez-Gil
- Sylvester Comprehensive Cancer Center and Department of Epidemiology and Public Health, University of Miami Miller School of Medicine, Miami, Florida, United States of America
| | - Stephen J. Chanock
- Epidemiology and Biostatistics Program, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Peggy Wan
- Department of Preventive Medicine, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
| | - Xin Sheng
- Department of Preventive Medicine, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
| | - Loreall C. Pooler
- Department of Preventive Medicine, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
| | - David J. Van Den Berg
- Department of Preventive Medicine, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
- Epigenome Center, Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
| | - Loic Le Marchand
- Epidemiology Program, University of Hawaii Cancer Center, Honolulu, Hawaii, United States of America
| | - Laurence N. Kolonel
- Epidemiology Program, University of Hawaii Cancer Center, Honolulu, Hawaii, United States of America
| | - Brian E. Henderson
- Department of Preventive Medicine, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
| | - Chris A. Haiman
- Department of Preventive Medicine, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
| | - Daniel O. Stram
- Department of Preventive Medicine, Keck School of Medicine and Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California, United States of America
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Lindholm Carlström E, Saetre P, Rosengren A, Thygesen JH, Djurovic S, Melle I, Andreassen OA, Werge T, Agartz I, Hall H, Terenius L, Jönsson EG. Association between a genetic variant in the serotonin transporter gene (SLC6A4) and suicidal behavior in patients with schizophrenia. Behav Brain Funct 2012; 8:24. [PMID: 22594806 PMCID: PMC3527134 DOI: 10.1186/1744-9081-8-24] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Accepted: 04/25/2012] [Indexed: 12/13/2022] Open
Abstract
Background The serotonin (5-hydroxytryptamin; 5-HT) system has a central role in the circuitry of cognition and emotions. Multiple lines of evidence suggest that genetic variation in the serotonin transporter gene (SLC6A4; 5-HTT) is associated with schizophrenia and suicidal behavior. In this study, we wanted to elucidate whether SLC6A4 variations is involved in attempted suicide among patients with schizophrenia in a Scandinavian case–control sample. Methods Patients diagnosed with schizophrenia from three Scandinavian samples were assessed for presence or absence of suicide attempts, based on record reviews and interview data. Seven SLC6A4 single nucleotide polymorphisms (SNPs) were genotyped in 837 schizophrenia patients and 1,473 control individuals. Association analyses and statistical evaluations were performed with the program UNPHASED (version 3.0.9). Results We observed an allele association between the SNP rs16965628, located in intron one of SLC6A4, and attempted suicide (adjusted p-value 0.01), among patients with schizophrenia. No association was found to a diagnosis of schizophrenia, when patients were compared to healthy control individuals. Conclusion The gene SLC6A4 appears to be involved in suicidal ideation among patients with schizophrenia. Independent replication is needed before more firm conclusions can be drawn.
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Affiliation(s)
- Eva Lindholm Carlström
- Department of Clinical Neuroscience, HUBIN Project, Karolinska Institutet and Hospital, R5:00, Stockholm, Sweden.
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Sulik MJ, Eisenberg N, Lemery-Chalfant K, Spinrad TL, Silva KM, Eggum ND, Betkowski JA, Kupfer A, Smith CL, Gaertner B, Stover DA, Verrelli BC. Interactions between serotonin transporter gene haplotypes and quality of mothers' parenting predict the development of children's noncompliance. Dev Psychol 2012; 48:740-54. [PMID: 22059451 PMCID: PMC3341540 DOI: 10.1037/a0025938] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The LPR and STin2 polymorphisms of the serotonin transporter gene (SLC6A4) were combined into haplotypes that, together with quality of maternal parenting, were used to predict initial levels and linear change in children's (N = 138) noncompliance and aggression from age 18-54 months. Quality of mothers' parenting behavior was observed when children were 18 months old, and nonparental caregivers' reports of noncompliance and aggression were collected annually from 18 to 54 months of age. Quality of early parenting was negatively related to the slope of noncompliance only for children with the LPR-S/STin2-10 haplotype and to 18-month noncompliance only for children with haplotypes that did not include LPR-S. The findings support the notion that SLC6A4 haplotypes index differential susceptibility to variability in parenting quality, with certain haplotypes showing greater reactivity to both supportive and unsupportive environments. These different genetic backgrounds likely reflect an evolutionary response to variation in the parenting environment.
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Affiliation(s)
- Michael J Sulik
- Department of Psychology, Arizona State University, Tempe, AZ 85287-1104, USA
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Haddley K, Bubb VJ, Breen G, Parades-Esquivel UM, Quinn JP. Behavioural genetics of the serotonin transporter. Curr Top Behav Neurosci 2012; 12:503-535. [PMID: 22261701 DOI: 10.1007/7854_2011_186] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The serotonin transporter is a key regulator of the bioavailability of serotonin and therefore any modulation in the expression or action of the transporter would be expected to have consequences on behaviour. The transporter has therefore become a target for pharmaceutical intervention in behavioural and mood disorders. The search for polymorphic variants in the transporter that would associate with neurological disorders has been extensive but has become focused on two domains which are both termed variable number tandem repeat (VNTR)polymorphisms. Both of these VNTRs are in non-coding DNA and therefore proposed to be mechanistically involved in a disorder through their ability to modulate transcriptional or post-transcriptional regulation of the transporter. The most extensively studied is in the promoter and is a bi-allelic insertion/deletion found in the 50 promoter region of the gene 1.2 kb upstream of the transcriptional start site. This VNTR, termed, 5-HTTLPR was initially identified as two variants containing either, 14 (short/deletion) or 16 (long/insertion) copies of a 22 bp repeat. A second widely studied VNTR found in the non-coding region of the transporter is located within intron 2 and comprises 9, 10 or 12 copies of a16–17 bp repeat termed, STin2.9, STin2.10 and STin2.12, respectively. These VNTR polymorphisms have been associated with a range of behavioural and psychiatric disorders including depression, OCD, anxiety and schizophrenia, however often the lack of reproducibility in different cohorts has led to debate on the actual association of the polymorphisms with this extensive range of neurological conditions. Here we review these two polymorphic VNTRs in depth and relate that to pharmaceutical response, their ability to regulate differential transporter expression, their core involvement in gene-environment interaction and their genetic association with specific disorders.
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Hong KW, Weiss A, Morimura N, Udono T, Hayasaka I, Humle T, Murayama Y, Ito S, Inoue-Murayama M. Polymorphism of the tryptophan hydroxylase 2 (TPH2) gene is associated with chimpanzee neuroticism. PLoS One 2011; 6:e22144. [PMID: 21765945 PMCID: PMC3135609 DOI: 10.1371/journal.pone.0022144] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Accepted: 06/16/2011] [Indexed: 11/19/2022] Open
Abstract
In the brain, serotonin production is controlled by tryptophan hydroxylase 2 (TPH2), a genotype. Previous studies found that mutations on the TPH2 locus in humans were associated with depression and studies of mice and studies of rhesus macaques have shown that the TPH2 locus was involved with aggressive behavior. We previously reported a functional single nucleotide polymorphism (SNP) in the form of an amino acid substitution, Q468R, in the chimpanzee TPH2 gene coding region. In the present study we tested whether this SNP was associated with neuroticism in captive and wild-born chimpanzees living in Japan and Guinea, respectively. Even after correcting for multiple tests (Bonferroni p = 0.05/6 = 0.008), Q468R was significantly related to higher neuroticism (β = 0.372, p = 0.005). This study is the first to identify a genotype linked to a personality trait in chimpanzees. In light of the prior studies on humans, mice, and rhesus macaques, these findings suggest that the relationship between neuroticism and TPH2 has deep phylogenetic roots.
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Affiliation(s)
- Kyung-Won Hong
- The United Graduate School of Agricultural Science, Gifu University, Gifu, Japan
| | - Alexander Weiss
- Scottish Primate Research Group, Department of Psychology, School of Philosophy, Psychology and Language Sciences, The University of Edinburgh, Edinburgh, United Kingdom
| | | | - Toshifumi Udono
- The Chimpanzee Sanctuary Uto, Sanwa Kagaku Kenkyusho co., Ltd., Uto, Kumamoto, Japan
| | - Ikuo Hayasaka
- The Chimpanzee Sanctuary Uto, Sanwa Kagaku Kenkyusho co., Ltd., Uto, Kumamoto, Japan
| | - Tatyana Humle
- School of Anthropology and Conservation, University of Kent. Canterbury, Kent, United Kingdom
| | | | - Shin'ichi Ito
- Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan
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Terrazzino S, Tassorelli C, Sances G, Allena M, Viana M, Monaco F, Bellomo G, Nappi G, Canonico PL, Genazzani AA. Association of haplotype combination of serotonin transporter gene polymorphisms with monthly headache days in MOH patients. Eur J Neurol 2011; 19:69-75. [DOI: 10.1111/j.1468-1331.2011.03436.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Clarke H, Flint J, Attwood AS, Munafò MR. Association of the 5- HTTLPR genotype and unipolar depression: a meta-analysis. Psychol Med 2010; 40:1767-1778. [PMID: 20380781 DOI: 10.1017/s0033291710000516] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND We sought to ascertain the strength of evidence for association between the 5-HTTLPR polymorphism and unipolar depression. METHOD We applied meta-analytic techniques to data from relevant published studies, and obtained an estimate of the likely magnitude of effect of any association. We also tested for possible publication bias, and explored the impact of various study design characteristics on the magnitude of the observed effect size. RESULTS Meta-analysis indicated evidence of a small but statistically significant association between the 5-HTTLPR polymorphism and unipolar depression [odds ratio (OR) 1.08, 95% confidence interval (CI) 1.03-1.12]. This remained significant when data from samples of European and East Asian ancestry were analyzed separately. In all cases there was evidence of significant between-study heterogeneity, although the observed associations were robust to the application of a random-effects framework. CONCLUSIONS Our results support the presence of a small effect of a polymorphism in the serotonin transporter promoter on susceptibility to depression. However, we caution that it is possible that the effect has an artifactual basis, rather than a biological origin.
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Affiliation(s)
- H Clarke
- Department of Experimental Psychology, University of Bristol, UK
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Yang H, Liu J, Sui J, Pearlson G, Calhoun VD. A Hybrid Machine Learning Method for Fusing fMRI and Genetic Data: Combining both Improves Classification of Schizophrenia. Front Hum Neurosci 2010; 4:192. [PMID: 21119772 PMCID: PMC2990459 DOI: 10.3389/fnhum.2010.00192] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Accepted: 09/24/2010] [Indexed: 11/25/2022] Open
Abstract
We demonstrate a hybrid machine learning method to classify schizophrenia patients and healthy controls, using functional magnetic resonance imaging (fMRI) and single nucleotide polymorphism (SNP) data. The method consists of four stages: (1) SNPs with the most discriminating information between the healthy controls and schizophrenia patients are selected to construct a support vector machine ensemble (SNP-SVME). (2) Voxels in the fMRI map contributing to classification are selected to build another SVME (Voxel-SVME). (3) Components of fMRI activation obtained with independent component analysis (ICA) are used to construct a single SVM classifier (ICA-SVMC). (4) The above three models are combined into a single module using a majority voting approach to make a final decision (Combined SNP-fMRI). The method was evaluated by a fully validated leave-one-out method using 40 subjects (20 patients and 20 controls). The classification accuracy was: 0.74 for SNP-SVME, 0.82 for Voxel-SVME, 0.83 for ICA-SVMC, and 0.87 for Combined SNP-fMRI. Experimental results show that better classification accuracy was achieved by combining genetic and fMRI data than using either alone, indicating that genetic and brain function representing different, but partially complementary aspects, of schizophrenia etiopathology. This study suggests an effective way to reassess biological classification of individuals with schizophrenia, which is also potentially useful for identifying diagnostically important markers for the disorder.
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Affiliation(s)
- Honghui Yang
- Department of Environment Engineering, Northwestern Polytechnical University Xi'an, China
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Bosia M, Anselmetti S, Pirovano A, Ermoli E, Marino E, Bramanti P, Smeraldi E, Cavallaro R. HTTLPR functional polymorphism in schizophrenia: executive functions vs. sustained attention dissociation. Prog Neuropsychopharmacol Biol Psychiatry 2010; 34:81-5. [PMID: 19818823 DOI: 10.1016/j.pnpbp.2009.10.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Revised: 09/23/2009] [Accepted: 10/02/2009] [Indexed: 10/20/2022]
Abstract
BACKGROUND Recently attention has been addressed to the role of 5-HT in cognition and several experimental studies revealed that manipulations of the central 5-HT system can produce quite specific changes in cognitive functioning. These results may suggest new treatment strategies to improve cognition in psychiatric conditions characterized by neuropsychological impairments, such as schizophrenia. It is possible to investigate the involvement of 5-HT in cognition by examining the impact of genetic variation in key regulators of serotoninergic neurotransmission. Among these, the serotonin transporter (5-HTT) presents a functional polymorphism in the transcriptional control region of the gene (5-HTTLPR) affecting transcriptional efficiency. In the present study, we aimed to analyze the effect of 5-HTTLPR polymorphism on specific cognitive functions, known to be affected by 5-HT manipulation and altered in schizophrenia. METHODS 223 schizophrenia patients were tested with Wisconsin Card Sorting Test (WCST), for the evaluation of cognitive flexibility, Continuous Performance Test (CPT), for the evaluation of attention, and genotyped for the 5-HTTLPR. RESULTS We found a significant association between HTT polymorphism and executive functions and inversely with sustained attention. The presence of the high-activity long (L) allele in homozygosis was a predictor of better executive performances and poorer performances of attention. CONCLUSIONS Our findings suggest that factors affecting serotonin availability may play a specific role in cognitive processes, probably through complex modulation of the different performance components.
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Affiliation(s)
- Marta Bosia
- Department of Clinical Neurosciences, San Raffaele Universitary Scientific Institute Hospital, Via Stamira d'Ancona 20, 20127 Milano, Italy.
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Popova NK, Naumenko VS, Tibeikina MA, Kulikov AV. Serotonin transporter, 5-HT1A receptor, and behavior in DBA/2J mice in comparison with four inbred mouse strains. J Neurosci Res 2010; 87:3649-57. [PMID: 19533737 DOI: 10.1002/jnr.22155] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Prepulse inhibition (PPI), the reduction in acoustic startle produced when it is preceded by a weak prepulse stimulus, is impaired in schizophrenic patients. The DBA/2J mouse strain displayed deficient PPI and is therefore suggested as an experimental animal model for the loss of sensorimotor gating in schizophrenia. Brain serotonin (5-HT) has been implicated in the pathophysiology of several psychiatric disorders, including major depressive disorder and schizophrenia. In the present study, behavior, 5-HT transporter (5-HTT) mRNA level, 5-HT(1A) receptor mRNA level, and 5-HT(1A) receptor density in the brain regions were studied in DBA/2J mice in comparison with four inbred mouse strains (CBA/Lac, C57BL/6, BALB/c, and ICR). A decrease in 5-HTT mRNA level in the midbrain and a reduced density of 5-HT(1A) receptors in the frontal cortex without significant changes in 5-HT(1A) receptor mRNA level in DBA/2J mice were found. It was shown that, along with decreased PPI, DBA/2J mice demonstrated considerably reduced immobility in the tail suspension test and in the forced swim test. No significant interstrain differences in intermale aggression, or in light-dark box and elevated plus-maze tests, were found. The results suggested the involvement of decreased 5-HTT gene expression and 5-HT(1A) receptor density in genetically defined PPI deficiency and showed a lack of any association between PPI deficiency and predisposition to aggressive, anxiety, and depressive-like behaviors.
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Affiliation(s)
- Nina K Popova
- Department of Behavioral Neurogenomics, Institute of Cytology and Genetics, Siberian Division of Russian Academy of Science, Novosibirsk, Russia
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15
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Terracciano A, Balaci L, Thayer J, Scally M, Kokinos S, Ferrucci L, Tanaka T, Zonderman AB, Sanna S, Olla N, Zuncheddu MA, Naitza S, Busonero F, Uda M, Schlessinger D, Abecasis G, Costa PT. Variants of the serotonin transporter gene and NEO-PI-R Neuroticism: No association in the BLSA and SardiNIA samples. Am J Med Genet B Neuropsychiatr Genet 2009; 150B:1070-7. [PMID: 19199283 PMCID: PMC2788669 DOI: 10.1002/ajmg.b.30932] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The polymorphism in the serotonin transporter gene promoter region (5-HTTLPR) is by far the most studied variant hypothesized to influence Neuroticism-related personality traits. The results of previous studies have been mixed and appear moderated by the personality questionnaire used. Studies that used the TCI to assess Harm Avoidance or the EPQ to assess Neuroticism have found no association with the 5-HTTLPR. However, studies that used the NEO-PI-R or related instruments (NEO-PI, NEO-FFI) to measure Neuroticism have found some evidence of association. This study examines the association of variants in the serotonin transporter gene in a sample from a genetically isolated population within Sardinia (Italy) that is several times larger than previous samples that used the NEO-PI-R (N = 3,913). The association was also tested in a sample (N = 548) from the Baltimore Longitudinal Study of Aging (BLSA), in which repeated NEO-PI-R assessments were obtained. In the SardiNIA sample, we found no significant association of the 5-HTTLPR genotypes with Neuroticism or its facets (Anxiety, Angry-Hostility, Depression, Self-Consciousness, Impulsiveness, and Vulnerability). In the BLSA sample, we found lower scores on Neuroticism traits for the heterozygous group, which is inconsistent with previous studies. We also examined eight SNPs in the SardiNIA (N = 3,972) and nine SNPs in the BLSA (N = 1,182) that map within or near the serotonin transporter gene (SLC6A4), and found no association. Along with other large studies that used different phenotypic measures and found no association, this study substantially increases the evidence against a link between 5-HTT variants and Neuroticism-related traits.
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Affiliation(s)
| | - Lenuta Balaci
- Istituto di Neurogenetica e Neurofarmacologia, Consiglio Nazionale delle Ricerche, Cagliari, Italy
| | - Jason Thayer
- National Institute on Aging, NIH, DHHS, Baltimore, MD, USA
| | - Matthew Scally
- National Institute on Aging, NIH, DHHS, Baltimore, MD, USA
| | - Sarah Kokinos
- National Institute on Aging, NIH, DHHS, Baltimore, MD, USA
| | - Luigi Ferrucci
- National Institute on Aging, NIH, DHHS, Baltimore, MD, USA
| | | | | | - Serena Sanna
- Istituto di Neurogenetica e Neurofarmacologia, Consiglio Nazionale delle Ricerche, Cagliari, Italy
| | - Nazario Olla
- Istituto di Neurogenetica e Neurofarmacologia, Consiglio Nazionale delle Ricerche, Cagliari, Italy
| | | | - Silvia Naitza
- Istituto di Neurogenetica e Neurofarmacologia, Consiglio Nazionale delle Ricerche, Cagliari, Italy
| | - Fabio Busonero
- Istituto di Neurogenetica e Neurofarmacologia, Consiglio Nazionale delle Ricerche, Cagliari, Italy
| | - Manuela Uda
- Istituto di Neurogenetica e Neurofarmacologia, Consiglio Nazionale delle Ricerche, Cagliari, Italy
| | | | - Goncalo Abecasis
- Center for Statistical Genetics, Department of Biostatistics, University of Michigan, Ann Arbor, MI, USA
| | - Paul T. Costa
- National Institute on Aging, NIH, DHHS, Baltimore, MD, USA
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Wray NR, James MR, Gordon SD, Dumenil T, Ryan L, Coventry WL, Statham DJ, Pergadia ML, Madden PAF, Heath AC, Montgomery GW, Martin NG. Accurate, Large-Scale Genotyping of 5HTTLPR and Flanking Single Nucleotide Polymorphisms in an Association Study of Depression, Anxiety, and Personality Measures. Biol Psychiatry 2009; 66:468-76. [PMID: 19541292 PMCID: PMC3060567 DOI: 10.1016/j.biopsych.2009.04.030] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2008] [Revised: 03/23/2009] [Accepted: 04/15/2009] [Indexed: 12/16/2022]
Abstract
BACKGROUND The length polymorphism repeat in the promoter region of the serotonin transporter gene (5HTTLPR) is one of the most studied polymorphisms for association with a range of psychiatric and personality phenotypes. However, the original 5HTTLPR assay is prone to bias toward short allele calling. METHODS We designed new assays for the 5HTTLPR suitable for large-scale genotyping projects and we genotyped 13 single nucleotide polymorphisms (SNPs) in a 38-kilobase region around the 5HTTLPR, including SNP rs25531, a polymorphism of the 5HTTLPR long allele. Association analysis was conducted for major depression and/or anxiety disorder in unrelated cases (n = 1161) and control subjects (n = 1051) identified through psychiatric interviews administered to a large population sample of Australian twin families. Participants had been scored for personality traits several years earlier (n > or = 2643 unrelated individuals). RESULTS We identified a two-SNP haplotype proxy for 5HTTLPR; the CA haplotype of SNPs rs4251417 and rs2020934 is coupled with the short allele of 5HTTLPR (r(2) = .72). We found evidence for association (p = .0062, after accounting for multiple testing) for SLC6A4 SNPs rs6354 and rs2020936 (positioned in a different linkage disequilibrium [LD] block about 15.5 kb from 5HTTLPR) with anxiety and/or depression and neuroticism, with the strongest association for recurrent depression with onset in young adulthood (odds ratio = 1.55, 95% confidence interval = 1.16-2.06). CONCLUSIONS The associated SNPs are in the same LD block as the variable number of tandem repeats serotonin transporter intron 2 marker, for which association has previously been reported.
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Affiliation(s)
- Naomi R Wray
- Genetic and Molecular Epidemiology Laboratories, Queensland Institute of Medical Research, 300 Herston Road, Brisbane 4006, Australia.
| | - Michael R James
- Genetic and Molecular Epidemiology Laboratories, Queensland Institute of Medical Research, Brisbane, Queensland 4006, Australia
| | - Scott D Gordon
- Genetic and Molecular Epidemiology Laboratories, Queensland Institute of Medical Research, Brisbane, Queensland 4006, Australia
| | - Troy Dumenil
- Genetic and Molecular Epidemiology Laboratories, Queensland Institute of Medical Research, Brisbane, Queensland 4006, Australia
| | - Leanne Ryan
- Genetic and Molecular Epidemiology Laboratories, Queensland Institute of Medical Research, Brisbane, Queensland 4006, Australia
| | - William L Coventry
- Genetic and Molecular Epidemiology Laboratories, Queensland Institute of Medical Research, Brisbane, Queensland 4006, Australia,School of Behavioural, Cognitive and Social Sciences, University of New England, Armidale, New South Wales 2350, Australia
| | - Dixie J Statham
- Genetic and Molecular Epidemiology Laboratories, Queensland Institute of Medical Research, Brisbane, Queensland 4006, Australia,Faculty of Arts & Social Sciences, University of the Sunshine Coast, Maroochydore, Queensland 4558, Australia
| | - Michele L Pergadia
- Washington University School of Medicine, Department of Psychiatry, St Louis, Missouri, USA
| | - Pamela AF Madden
- Washington University School of Medicine, Department of Psychiatry, St Louis, Missouri, USA
| | - Andrew C Heath
- Washington University School of Medicine, Department of Psychiatry, St Louis, Missouri, USA
| | - Grant W Montgomery
- Genetic and Molecular Epidemiology Laboratories, Queensland Institute of Medical Research, Brisbane, Queensland 4006, Australia
| | - Nicholas G Martin
- Genetic and Molecular Epidemiology Laboratories, Queensland Institute of Medical Research, Brisbane, Queensland 4006, Australia
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Vijayan NN, Iwayama Y, Koshy LV, Natarajan C, Nair C, Allencherry PM, Yoshikawa T, Banerjee M. Evidence of association of serotonin transporter gene polymorphisms with schizophrenia in a South Indian population. J Hum Genet 2009; 54:538-42. [DOI: 10.1038/jhg.2009.76] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Pal P, Mihanović M, Molnar S, Xi H, Sun G, Guha S, Jeran N, Tomljenović A, Malnar A, Missoni S, Deka R, Rudan P. Association of tagging single nucleotide polymorphisms on 8 candidate genes in dopaminergic pathway with schizophrenia in Croatian population. Croat Med J 2009; 50:361-9. [PMID: 19673036 PMCID: PMC2728391 DOI: 10.3325/cmj.2009.50.361] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2009] [Accepted: 05/25/2009] [Indexed: 11/05/2022] Open
Abstract
AIM To perform a comprehensive evaluation of association of common genetic variants in candidate genes in the dopaminergic pathway with schizophrenia in a sample from Croatian population. METHODS A case-control association study was performed on 104 unrelated patients with schizophrenia recruited from a psychiatric hospital in Zagreb and 131 phenotypically normal Croatian subjects. Forty-nine tagging single nucleotide polymorphisms (tagSNPs) in 8 candidate genes in the dopaminergic pathway were identified from the HapMap database and tested for association. Genotyping was performed using the SNPlex platform. Statistical analysis was conducted to assess allelic and genotypic associations between cases and controls using a goodness of fit chi(2) test and trend test, respectively; adjustment for multiple testing was done by permutation based analysis. RESULTS Significant allele frequency differences between schizophrenia cases and controls were observed at 4 tagSNPs located in the genes DRD5, HTR1B1, DBH, and TH1 (P<0.005). A trend test also confirmed the genotypic association (P<0.001) of these 4 tagSNPs. Additionally, moderate association (P<0.05) was observed with 8 tagSNPs on SLC6A3, DBH, DRD4, SLC6A4, and COMT. CONCLUSIONS Common genetic variants in genes involved in the dopaminergic pathway are associated with schizophrenia in the populations of Caucasian descent.
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Affiliation(s)
- Prodipto Pal
- Department of Environmental Health, Center for Genome Information, University of Cincinnati, Cincinnati, OH, USA
| | | | - Sven Molnar
- St. Ivan Psychiatric Hospital, Zagreb, Croatia
| | - Huifeng Xi
- Department of Environmental Health, Center for Genome Information, University of Cincinnati, Cincinnati, OH, USA
| | - Guangyun Sun
- Department of Environmental Health, Center for Genome Information, University of Cincinnati, Cincinnati, OH, USA
| | - Saurav Guha
- Department of Environmental Health, Center for Genome Information, University of Cincinnati, Cincinnati, OH, USA
| | - Nina Jeran
- Institute for Anthropological Research, Zagreb, Croatia
| | | | - Ana Malnar
- Institute for Anthropological Research, Zagreb, Croatia
| | - Saša Missoni
- Institute for Anthropological Research, Zagreb, Croatia
| | - Ranjan Deka
- Department of Environmental Health, Center for Genome Information, University of Cincinnati, Cincinnati, OH, USA
| | - Pavao Rudan
- Institute for Anthropological Research, Zagreb, Croatia
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Lin C, Tang W, Hu J, Gao L, Huang K, Xu Y, He G, Liang P, Feng G, He L, Shi Y. Haplotype analysis confirms association of the serotonin transporter (5-HTT) gene with schizophrenia in the Han Chinese population. Neurosci Lett 2009; 453:210-3. [PMID: 19429037 DOI: 10.1016/j.neulet.2009.02.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2008] [Revised: 02/10/2009] [Accepted: 02/11/2009] [Indexed: 11/17/2022]
Abstract
Serotonin transmission has long been suspected as being involved in the pathogenesis of schizophrenia. 5-HTT is a promising candidate gene for schizophrenia due to its critical role in regulating serotonin transmission and role in the mechanism of the atypical antipsychotic drugs. A common polymorphism STin2 VNTR in the 5-HTT gene has been extensively investigated in the genetic association studies, but the results are conflicting. Meanwhile, the SNPs of the 5-HTT gene have been much less explored. We therefore conducted a case-control study of the association between STin2 VNTR and three tagging SNPs in 5-HTT and schizophrenia in the Han Chinese population based on a cohort of 329 schizophrenic patients and 288 control subjects. No association was found in the single locus, but haplotype-based analyses revealed significant association between two haplotypes with schizophrenia even after Bonferroni correction (P=0.00000538 and 0.011).
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Affiliation(s)
- Chuwen Lin
- Bio-X Center, Shanghai Jiao Tong University, Shanghai, China
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Gonçalves P, Araújo JR, Martel F. The effect of high glucose on SERT, the human plasmalemmal serotonin transporter. Nutr Neurosci 2009; 11:244-50. [PMID: 19000377 DOI: 10.1179/147683008x344156] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
The aim of this work was to investigate the effect of short- and long-term high-glucose exposure on the plasmalemmal serotonin transporter (SERT)-mediated uptake of [(3)H]-serotonin (5-HT) by Caco-2 cells. Short-term exposure of Caco-2 cells to high apical glucose levels (30 mM for 2 h or 40 mM for 1 h) decreased the uptake of [(3)H]-5-HT by 20-30%. On the other hand, long-term (21-24 weeks) exposure of the cells to high (25 mM) glucose caused a 30% increase in the uptake of [(3)H]5-HT. Under these conditions, the affinity of the transporter for 5-HT and noradrenaline was not significantly changed, and the inhibitory potencies of fluoxetine and desipramine were also unchanged. In conclusion, high-glucose levels modulate SERT activity. A short-term exposure of the cells to a high concentration of glucose decreases the activity of the transporter, whereas a longer exposure of the cells to a high concentration of glucose increases the activity of SERT, without interfering with its affinity.
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Affiliation(s)
- Pedro Gonçalves
- Department of Biochemistry (U38-FCT), Faculty of Medicine, University of Porto, Porto, Portugal.
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Dolzan V, Serretti A, Mandelli L, Koprivsek J, Kastelic M, Plesnicar BK. Acute antipyschotic efficacy and side effects in schizophrenia: association with serotonin transporter promoter genotypes. Prog Neuropsychopharmacol Biol Psychiatry 2008; 32:1562-6. [PMID: 18573584 DOI: 10.1016/j.pnpbp.2008.05.022] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2008] [Revised: 04/30/2008] [Accepted: 05/25/2008] [Indexed: 10/22/2022]
Abstract
BACKGROUND The serotonin transporter (5-HTT) plays an important role in serotonergic neurotransmission. In the present study, we investigated the effects of the 44 bp insertion/deletion polymorphism in the promoter region of 5-HTT gene (5-HTTLPR) on symptomatology of psychosis and clinical response to antipsychotic drugs. METHODS In total 56 patients acutely treated with haloperidol or risperidone either for the first episode of schizophrenia, schizophreniform or schizoaffective disorders, or for the relapse of these psychotic disorders after tapering their maintenance treatment, were genotyped for the 5-HTTLPR L and S alleles and for the new A/G functional variant within the L alelle (La/g). Psychopathological symptoms were assessed with the Brief Psychiatric Rating Scale (BPRS) and with Clinical Global Impression (CGI) twice: at 8-12 days after the first dose of antipsychotic and after 4 weeks. Extrapyramidal side effects were assessed with the Simpson-Angus Extrapyramidal Side Effects Scale (EPS), the Barnes Akathisia Scale (BARS) and the Abnormal Involuntary Movement Scale (AIMS). RESULTS Age, body mass index (BMI), illness duration, drug type and dosage were considered as covariates when analysing association with genetic variants as they were associated with baseline or final BPRS and CGI scores and/or extrapyramidal side effects. 5-HTTLPR was not associated with baseline and final BPRS and CGI scores or with the CGI% reduction. However, the 5-HTTLPR S allele was associated with a lower improvement in BPRS scores (P=0.022) and this effect was even stronger after pooling subjects with S or Lg containing alleles (P=0.006). We did not observe any effect of 5-HTTLPR on acute antipsychotics side effects. CONCLUSION Present result supports a contribution of serotonin system to neuroleptics efficacy for the treatment of schizophrenia. The analysis of the La/g functional variant may significantly improve the predictive power of 5-HTTLPR genotyping and represent a step further towards the development of the personalized antipsychotic treatment.
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Affiliation(s)
- Vita Dolzan
- University of Ljubljana, Faculty of Medicine, Institute of Biochemistry, Vrazov trg 2, SI-1000 Ljubljana, Slovenia.
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