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Hasegawa M, Tanifuji T, Okazaki S, Otsuka I, Shirai T, Shindo R, Horai T, Mouri K, Takahashi M, Kondo T, Ueno Y, Hishimoto A. Association of two variable number of tandem repeats in the monoamine oxidase A gene promoter with suicide completion: The present study and meta-analysis. Neuropsychopharmacol Rep 2023; 43:338-345. [PMID: 37202909 PMCID: PMC10496037 DOI: 10.1002/npr2.12344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 04/14/2023] [Accepted: 04/26/2023] [Indexed: 05/20/2023] Open
Abstract
BACKGROUND One potential cause of suicide is serotonergic dysfunction. Sex differences have been reported to modulate the effects of serotonergic polymorphisms. Monoamine oxidase A (MAOA) is an enzyme that degrades serotonin and is located on the X chromosome. A previous study indicated that the upstream (u) variable number of tandem repeat (VNTR) in the MAOA gene promoter may be associated with suicide. However, a meta-analysis showed that this polymorphism may not be related to suicide. According to a recent study, compared with the uVNTR, the distal (d)VNTR and the haplotypes of the two VNTRs modulate MAOA expression. METHODS We examined the two VNTRs in the MAOA gene promoter in 1007 subjects who committed suicide and 844 healthy controls. We analyzed the two VNTRs using fluorescence-based polymerase chain reaction assays. We conducted a meta-analysis for the two VNTRs to update it. RESULTS Our results demonstrated that neither the genotype-based associations nor allele/haplotype frequencies of the two VNTRs were significantly associated with suicide. In the meta-analysis, we did not indicate relationships between uVNTR and suicide nor did we identify articles analyzing dVNTR in suicide. CONCLUSION Overall, we did not find a relationship between the two VNTRs in the MAOA promoter and suicide completion; thus, warranting further studies are required.
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Affiliation(s)
- Masashi Hasegawa
- Department of PsychiatryKobe University Graduate School of MedicineKobeJapan
| | - Takaki Tanifuji
- Department of PsychiatryKobe University Graduate School of MedicineKobeJapan
| | - Satoshi Okazaki
- Department of PsychiatryKobe University Graduate School of MedicineKobeJapan
| | - Ikuo Otsuka
- Department of PsychiatryKobe University Graduate School of MedicineKobeJapan
| | - Toshiyuki Shirai
- Department of PsychiatryKobe University Graduate School of MedicineKobeJapan
| | - Ryota Shindo
- Department of PsychiatryKobe University Graduate School of MedicineKobeJapan
| | - Tadasu Horai
- Department of PsychiatryKobe University Graduate School of MedicineKobeJapan
| | - Kentaro Mouri
- Department of PsychiatryKobe University Graduate School of MedicineKobeJapan
| | - Motonori Takahashi
- Division of Legal Medicine, Department of Community Medicine and Social Health ScienceKobe University Graduate School of MedicineKobeJapan
| | - Takeshi Kondo
- Division of Legal Medicine, Department of Community Medicine and Social Health ScienceKobe University Graduate School of MedicineKobeJapan
| | - Yasuhiro Ueno
- Division of Legal Medicine, Department of Community Medicine and Social Health ScienceKobe University Graduate School of MedicineKobeJapan
| | - Akitoyo Hishimoto
- Department of PsychiatryKobe University Graduate School of MedicineKobeJapan
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Johnston JN, Campbell D, Caruncho HJ, Henter ID, Ballard ED, Zarate CA. Suicide Biomarkers to Predict Risk, Classify Diagnostic Subtypes, and Identify Novel Therapeutic Targets: 5 Years of Promising Research. Int J Neuropsychopharmacol 2022; 25:197-214. [PMID: 34865007 PMCID: PMC8929755 DOI: 10.1093/ijnp/pyab083] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/02/2021] [Accepted: 11/30/2021] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Suicide is a global health crisis. However, no objective biomarkers of suicide risk currently exist, and self-reported data can be unreliable, which limits prediction, diagnostic, and treatment efforts. Reliable biomarkers that can differentiate between diagnostic subgroups, predict worsening symptoms, or suggest novel therapeutic targets would be extremely valuable for patients, researchers, and clinicians. METHODS MEDLINE was searched for reports published between 2016 and 2021 using search terms (suicid*) AND (biomarker*) OR (indicat*). Reports that compared biomarkers between suicidal ideation, suicide attempt, death from suicide, or any suicide subgroup against other neuropsychiatric disorders were included. Studies exclusively comparing suicidal behavior or death from suicide with healthy controls were not included to ensure that biomarkers were specific to suicide and not other psychopathology. RESULTS This review summarizes the last 5 years of research into suicide-associated biomarkers and provides a comprehensive guide for promising and novel biomarkers that encompass varying presentations of suicidal ideation, suicide attempt, and death by suicide. The serotonergic system, inflammation, hypothalamic-pituitary-adrenal axis, lipids, and endocannabinoids emerged as the most promising diagnostic, predictive, and therapeutic indicators. CONCLUSIONS The utility of diagnostic and predictive biomarkers is evident, particularly for suicide prevention. While larger-scale studies and further in-depth research are required, the last 5 years of research has uncovered essential biomarkers that could ultimately improve predictive strategies, aid diagnostics, and help develop future therapeutic targets.
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Affiliation(s)
- Jenessa N Johnston
- Division of Medical Sciences, University of Victoria, Victoria, British Columbia, Canada
- Experimental Therapeutics and Pathophysiology Branch, Division of Intramural Research Programs, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland,USA
| | - Darcy Campbell
- Experimental Therapeutics and Pathophysiology Branch, Division of Intramural Research Programs, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland,USA
| | - Hector J Caruncho
- Division of Medical Sciences, University of Victoria, Victoria, British Columbia, Canada
- Experimental Therapeutics and Pathophysiology Branch, Division of Intramural Research Programs, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland,USA
| | - Ioline D Henter
- Experimental Therapeutics and Pathophysiology Branch, Division of Intramural Research Programs, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland,USA
| | - Elizabeth D Ballard
- Experimental Therapeutics and Pathophysiology Branch, Division of Intramural Research Programs, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland,USA
| | - Carlos A Zarate
- Experimental Therapeutics and Pathophysiology Branch, Division of Intramural Research Programs, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland,USA
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Ludwig B, Carlberg L, Kienesberger K, Swoboda P, Mitschek MMM, Bernegger A, Koller R, Inaner M, Senft B, Meisner L, Fischer-Hansal D, Affenzeller A, Huber J, Schoenthaler S, Kapusta ND, Haslacher H, Aigner M, Weinhaeusel A, Kasper S, Schosser A. Monoamino Oxidase A Gene Single-Nucleotide Polymorphisms and Methylation Status and the Risk of Violent Suicide Attempts in Affective Disorder Patients. Front Psychiatry 2021; 12:667191. [PMID: 34421667 PMCID: PMC8378401 DOI: 10.3389/fpsyt.2021.667191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 06/21/2021] [Indexed: 11/13/2022] Open
Abstract
Background: When investigating the neurobiology of suicidal behavior, Monoamino Oxidase A (MAOA) is one of the prime suspects to consider. Interestingly, MAOA dysregulation has also been associated with violent behavior in previous publications. In the present study, we aimed to establish an association between polymorphisms of the MAOA gene and methylation status of the MAOA gene Exon I, and suicide attempts with violent methods in a sample of affective disorder patients. Methods: Eight hundred fourteen Caucasian affective disorder patients were assessed at the Department of Psychiatry and Psychotherapy of the Medical University Vienna, the Karl Landsteiner University for Health and Science and Zentren für seelische Gesundheit, BBRZ-Med Leopoldau. An assemblage of psychiatric interviews was performed (e.g., SCAN, HAMD, SBQ-R, CTQ) and DNA samples of peripheral blood cells were collected for Sequenom MassARRAY® iPLEX Gold genotyping and Multiplexed and Sensitive DNA Methylation Testing. Results: Female affective disorder patients with a history of violent suicide attempt were found to have a significantly increased frequency of the AA genotype in the rs5906957 single nucleotide polymorphism (p = 0.003). Furthermore, the MAOA gene exon I promoter region showed significantly decreased methylation in female violent suicide attempter(s) as opposed to female affective disorder patients who had no history of suicide attempt or no history of suicide attempt with violent method. Limitations: The small sample size hampers to reveal small genetic effects as to be expected in psychiatric disorders. Conclusions: This study offers promising findings about associations between the MAOA gene and violent suicide especially in women.
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Affiliation(s)
- Birgit Ludwig
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria.,Department of Neurology, Medical University of Vienna, Vienna, Austria
| | - Laura Carlberg
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Klemens Kienesberger
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria.,Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Patrick Swoboda
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Marleen M M Mitschek
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Alexandra Bernegger
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Romina Koller
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Michelle Inaner
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Birgit Senft
- Zentren für Seelische Gesundheit, BBRZ-Med, Vienna, Austria
| | - Lisa Meisner
- Zentren für Seelische Gesundheit, BBRZ-Med, Vienna, Austria
| | - Daniela Fischer-Hansal
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria.,Zentren für Seelische Gesundheit, BBRZ-Med, Vienna, Austria
| | | | - Jasmin Huber
- Molecular Diagnostics Unit, Health and Environment Department, Austrian Institute of Technology, Vienna, Austria
| | - Silvia Schoenthaler
- Molecular Diagnostics Unit, Health and Environment Department, Austrian Institute of Technology, Vienna, Austria
| | - Nestor D Kapusta
- Department of Psychoanalysis and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Helmuth Haslacher
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Martin Aigner
- Department of Psychiatry and Psychotherapy, Karl Landsteiner University for Health and Science, Tulln, Austria
| | - Andreas Weinhaeusel
- Molecular Diagnostics Unit, Health and Environment Department, Austrian Institute of Technology, Vienna, Austria
| | - Siegfried Kasper
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Alexandra Schosser
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria.,Zentren für Seelische Gesundheit, BBRZ-Med, Vienna, Austria
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Hill SY, Jones BL, Haas GL. Suicidal ideation and aggression in childhood, genetic variation and young adult depression. J Affect Disord 2020; 276:954-962. [PMID: 32745832 PMCID: PMC7484359 DOI: 10.1016/j.jad.2020.07.049] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2019] [Revised: 06/01/2020] [Accepted: 07/05/2020] [Indexed: 12/26/2022]
Abstract
BACKGROUND Suicidal thoughts and behaviors have been studied in association with a variety of risk factors. The aim of the present study was to determine if levels of child/adolescent aggression and/or variation in candidate genes previously associated with suicidal behaviors in adults would influence the presence of suicidal ideation in childhood/adolescence, and to determine if ideation was associated with young adult depression. METHODS A longitudinal study of children, adolescents and young adults who were at high or low risk for alcohol and other substance use disorders by familial background were assessed. The Child Behavior Checklist (CBCL) aggression scale scores with derived subtypes (physical and relational) and genetic variation (ANKK1, DRD2, COMT, SLC6A4, HTR2C) were used as predictors of the presence and onset of suicidal ideation in childhood using survival analysis. Structural equation models (SEM) were fit to determine the relative importance of the predictors controlling for background variables. RESULTS CBCL aggression was significantly associated with child/adolescent suicidal ideation. One SNP in the ANKK1 gene (rs1800497), one in the HTR2C gene (rs6318), and two haplotypes, AAAC in the ANKK1-DRD2 complex and the CCC haplotype of the HTR2C gene, were significantly associated with the presence and onset of child/adolescent suicidal ideation. Follow up in young adulthood showed a significant relationship between suicidal ideation in childhood/adolescence and young adult depression. CONCLUSIONS Genetic variation and presence of elevated aggression scores from the childhood CBCL are significant predictors of childhood suicidal ideation. Suicidal ideation in childhood and being female are predictors of young adult depression.
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Affiliation(s)
- Shirley Y. Hill
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA 15213,Department of Psychology, University of Pittsburgh, Pittsburgh, PA, USA 15213,Department of Human Genetics, University of Pittsburgh, Pittsburgh, PA USA 15213
| | - Bobby L. Jones
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA 15213
| | - Gretchen L. Haas
- Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA 15213,Department of Psychology, University of Pittsburgh, Pittsburgh, PA, USA 15213,VA Pittsburgh Healthcare System, Pittsburgh, PA USA 15213
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5
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Post-mortem analysis of suicide victims shows ABCB1 haplotype 1236T-2677T-3435T as a candidate predisposing factor behind adverse drug reactions in females. Pharmacogenet Genomics 2019; 28:99-106. [PMID: 29481489 DOI: 10.1097/fpc.0000000000000328] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Genetic variation in efflux transporter, permeability glycoprotein (P-gp), has recently been associated with completed violent suicides and also violent suicide attempts. As depression is known to be a risk factor for suicide and many antidepressants are P-gp substrates, it has been speculated that inadequate antidepressant treatment response or adverse side effects could be involved. OBJECTIVES The aim of this study was to investigate whether there is an association between the P-gp coding ABCB1 gene and completed suicides in citalopram users. Also, the effect of sex and suicide method used (violent vs. non-violent) was evaluated. MATERIALS AND METHODS All cases included in the study population, 349 completed suicide victims and 284 controls, were shown to be positive for antidepressant citalopram in a post-mortem toxicological drug screen. ABCB1 1236C>T, 2677G>T/A and 3435C>T polymorphisms were determined by TaqMan genotyping assays. Haplotypes were constructed from genotype data using the PHASE software. The association between the manner of death and the ABCB1 haplotype was tested with logistic regression analysis. RESULTS No statistically significant differences were observed in the ABCB1 allele or genotype frequencies between the suicide and control groups. However, the ABCB1 1236T-2677T-3435T haplotype was associated with completed suicides of female citalopram users (odds ratio: 2.23; 95% confidence interval: 1.22-4.07; P=0.009). After stratification by the method used for suicide, the association emerged in fatal intoxications (odds ratio: 2.51; 95% confidence interval: 1.29-4.87; P=0.007). In other groups, no statistically significant associations were observed. CONCLUSION Our results suggest that female citalopram users with ABCB1 1236T-2677T-3435T are more vulnerable to adverse effects of the drugs as this haplotype was enriched in non-violent suicides of female citalopram users. Even though the biological mechanism behind this observation is unknown, the results provide another example of the importance of sex-based segregation in pharmacogenetics studies.
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6
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Fanelli G, Serretti A. The influence of the serotonin transporter gene 5-HTTLPR polymorphism on suicidal behaviors: a meta-analysis. Prog Neuropsychopharmacol Biol Psychiatry 2019; 88:375-387. [PMID: 30125622 DOI: 10.1016/j.pnpbp.2018.08.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Revised: 07/31/2018] [Accepted: 08/13/2018] [Indexed: 12/16/2022]
Abstract
Suicidal Behavior (SB) is the second leading cause of death among youths worldwide and the tenth among all age groups. Inherited genetic differences have a role in suicidality with heritability ranging from 30 to 55%. The SLC6A4 5-HTTLPR gene variant has been largely investigated for association with SB, with controversial results. In this work, we sought to determine whether the results of previous meta-analyses were confirmed or modified subsequent to the inclusion of more recent literature data. An electronic literature search was performed to identify relevant studies published until July 2018. Data were analysed through RevMan v5.3. Subgroup and sensitivity meta-analyses were performed considering different SB sub-phenotypes, ethnicity, gender and psychiatric diagnostic categories. Our literature search yielded 1186 articles; among these, we identified 45 pertinent case-control studies (15,341 subjects). No association was found between low-expressing alleles or genotypes (S + LG alleles or S' carrier genotypes) and SB in the primary analyses. However, low-expressing alleles (S + LG) were associated with an increased risk of Violent Suicide Attempt (OR = 1.44, C.I. 1.17-1.78, p = .0007). An effect of the same alleles on SB was found in a subpopulation of substance abusers, but this result was not confirmed after the exclusion of healthy subjects from the control group. The other sensitivity meta-analyses did not show any significant effect. Our findings contribute to clarify the conflicting previous evidence by suggesting an association between the 5-HTTLPR and Violent SB. Nonetheless, many other modulators, including environmental factors and epigenetic mechanisms may act to further increase the level of complexity.
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Affiliation(s)
- Giuseppe Fanelli
- Department of Biomedical and NeuroMotor Sciences, University of Bologna, Bologna, Italy
| | - Alessandro Serretti
- Department of Biomedical and NeuroMotor Sciences, University of Bologna, Bologna, Italy.
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7
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Rahikainen AL, Vauhkonen P, Pett H, Palo JU, Haukka J, Ojanperä I, Niemi M, Sajantila A. Completed suicides of citalopram users-the role of CYP genotypes and adverse drug interactions. Int J Legal Med 2018; 133:353-363. [PMID: 30173302 DOI: 10.1007/s00414-018-1927-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 08/24/2018] [Indexed: 12/25/2022]
Abstract
Depression is known to be a risk factor for suicide. Currently, the most used antidepressants are selective serotonin reuptake inhibitors (SSRIs). Not all users, however, benefit from them. In such cases, treatment failure can be explained in part by genetic differences. In this study, we investigated the role of pharmacogenetic factors in citalopram-positive completed suicides (n = 349). Since citalopram is metabolized by CYP2C19 and CYP2D6 enzymes, the study population was genotyped for clinically relevant CYP2C19 and CYP2D6 polymorphisms and CYP2D6 copy number variation. To assess genetic differences between suicide cases and Finns in general, Finnish population samples (n = 855) were used as controls. Also, the role of drug interactions among suicide cases was evaluated. We found enrichment of a combined group of genetically predicted poor and ultrarapid metabolizer phenotypes (gMPs) of CYP2C19 among suicide victims compared to controls 0.356 [0.31-0.41] vs. 0.265 [0.24-0.30] (p = 0.0065). In CYP2D6 gMPs, there was no difference between cases and controls when the study population was analyzed as a whole. However, there were significantly more poor metabolizers among females who committed suicide by poisoning compared to female controls. In 8% of all drug poisoning deaths, lifetime drug-drug interaction was evaluated having a contribution to the fatal outcome. From clinical perspective, pharmacogenetic testing prior to initiation of SSRI drug could be beneficial. It may also be useful in medico-legal settings as it may elucidate obscure poisoning cases. Also, the possibility of unintentional drug interactions should be taken into account in drug poisoning deaths.
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Affiliation(s)
- Anna-Liina Rahikainen
- Department of Forensic Medicine, University of Helsinki, P.O.Box 40, Kytösuontie 11, 00014, Helsinki, Finland.
| | - P Vauhkonen
- Forensic Medicine Unit, National Institute for Health and Welfare, P.O.Box 30, Mannerheimintie 166, 00271, Helsinki, Finland
| | - H Pett
- Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, the Netherlands.,Department of Clinical Pharmacology, University of Helsinki and Helsinki University Central Hospital, P.O.Box 20, Tukholmankatu 8C, 00014, Helsinki, Finland
| | - J U Palo
- Department of Forensic Medicine, University of Helsinki, P.O.Box 40, Kytösuontie 11, 00014, Helsinki, Finland.,Forensic Genetics Unit, National Institute for Health and Welfare, P.O.Box 30, Mannerheimintie 166, 00271, Helsinki, Finland
| | - J Haukka
- Department of Public Health, University of Helsinki, P.O.Box 20, Tukholmankatu 8B, 00014, Helsinki, Finland
| | - I Ojanperä
- Department of Forensic Medicine, University of Helsinki, P.O.Box 40, Kytösuontie 11, 00014, Helsinki, Finland.,Forensic Toxicology Unit, National Institute for Health and Welfare, P.O.Box 30, Mannerheimintie 166, 00271, Helsinki, Finland
| | - M Niemi
- Department of Clinical Pharmacology, University of Helsinki and Helsinki University Central Hospital, P.O.Box 20, Tukholmankatu 8C, 00014, Helsinki, Finland
| | - Antti Sajantila
- Department of Forensic Medicine, University of Helsinki, P.O.Box 40, Kytösuontie 11, 00014, Helsinki, Finland.
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Uršič K, Zupanc T, Paska AV. Analysis of promoter polymorphism in monoamine oxidase A ( MAOA) gene in completed suicide on Slovenian population. Neurosci Lett 2018; 673:111-115. [PMID: 29505805 DOI: 10.1016/j.neulet.2018.02.063] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 02/06/2018] [Accepted: 02/27/2018] [Indexed: 01/20/2023]
Affiliation(s)
- Katarina Uršič
- Institute of Biochemistry, Faculty of Medicine, University of Ljubljana, Vrazov trg 2, SI-1000 Ljubljana, Slovenia
| | - Tomaž Zupanc
- Institute of Forensic Medicine, Faculty of Medicine, University of Ljubljana, Korytkova ulica 2, SI-1000 Ljubljana, Slovenia
| | - Alja Videtič Paska
- Institute of Biochemistry, Faculty of Medicine, University of Ljubljana, Vrazov trg 2, SI-1000 Ljubljana, Slovenia.
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