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Fonseca L, Sena BF, Crossley N, Lopez-Jaramillo C, Koenen K, Freimer NB, Bressan RA, Belangero SI, Santoro ML, Gadelha A. Diversity matters: opportunities in the study of the genetics of psychotic disorders in low- and middle-income countries in Latin America. ACTA ACUST UNITED AC 2020; 43:631-637. [PMID: 33237255 PMCID: PMC8639010 DOI: 10.1590/1516-4446-2020-1240] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 09/22/2020] [Indexed: 01/15/2023]
Abstract
Lack of diversity regarding genetic and environmental backgrounds weakens the generalization and clinical applicability of research findings on psychotic disorders. Notably, Latin Americans have been generally neglected in genetic studies, comprising less than 2% of genome-wide association study samples. But Latin American populations represent a unique opportunity for research, given the exceptionally high ethnic admixture of this group. Increasing genetic diversity is essential to improve the fine mapping of known regions associated with psychotic disorders, discover novel genetic associations, and replicate studies. Additionally, Latin America is characterized by massive social, political, and economic inequalities, all known risk factors for mental health issues, including psychotic disorders. This article aims to 1) discuss the challenges and advantages of studying Latin America’s particular genetic makeup and environmental context; 2) review previous studies conducted in the region; and 3) describe three Latin American research initiatives in progress: the Neuropsychiatric Genetics of Psychosis in Mexican Populations (NeuroMEX), the Paisa, and the Latin American Network for the Study of Early Psychosis (ANDES) studies.
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Affiliation(s)
- Lais Fonseca
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.,Programa de Esquizofrenia (PROESQ), Departamento de Psiquiatria, UNIFESP, São Paulo, SP, Brazil
| | - Brena F Sena
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA.,Stanley Center for Psychiatric Research, Broad Institute, Massachusetts Institute of Technology (MIT) and Harvard, Cambridge, MA, USA
| | - Nicolas Crossley
- Department of Psychiatry, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.,Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Carlos Lopez-Jaramillo
- Research Group in Psychiatry, Department of Psychiatry, School of Medicine, Universidad de Antioquia, Medellin, Colombia.,Mood Disorders Program, Hospital San Vicente Fundación, Medellin, Colombia
| | - Karestan Koenen
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA.,Stanley Center for Psychiatric Research, Broad Institute, Massachusetts Institute of Technology (MIT) and Harvard, Cambridge, MA, USA
| | - Nelson B Freimer
- Department of Psychiatry and Biobehavioral Sciences, University of California (UCLA), Los Angeles, CA, USA.,Center for Neurobehavioral Genetics, Semel Institute for Neuroscience and Human Behavior, UCLA, Los Angeles, CA, USA.,Department of Human Genetics, UCLA, Los Angeles, CA, USA
| | - Rodrigo A Bressan
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.,Programa de Esquizofrenia (PROESQ), Departamento de Psiquiatria, UNIFESP, São Paulo, SP, Brazil
| | - Sintia I Belangero
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.,Disciplina de Genética, Departamento de Morfologia e Genética, UNIFESP, São Paulo, SP, Brazil
| | - Marcos L Santoro
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.,Disciplina de Genética, Departamento de Morfologia e Genética, UNIFESP, São Paulo, SP, Brazil
| | - Ary Gadelha
- Laboratório Interdisciplinar de Neurociências Clínicas (LiNC), Universidade Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil.,Programa de Esquizofrenia (PROESQ), Departamento de Psiquiatria, UNIFESP, São Paulo, SP, Brazil
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de Lima LO, Zicarelli CAM, Matsumura AS, Moroti-Perugini LR, de Castro Teixeira D, Fernandes KBP, de Oliveira Perrucini PD, Poli-Frederico RC. Lower limb muscle strength and serotonin receptor gene polymorphism as factors associated in women with fibromyalgia. Adv Rheumatol 2019; 59:59. [PMID: 31878982 DOI: 10.1186/s42358-019-0101-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 11/26/2019] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Fibromyalgia (FM) is a chronic pain syndrome characterized by generalized skeletal muscle chronic pain. Its etiology is not well defined, because there are several factors that may trigger it such as physical and/or emotional stresses, or a genetic susceptibility, involving serotonergic, dopaminergic and catecholaminergic paths. The objective of this study was to investigate the association between the strength of the lower limb, genetic polymorphism of the serotonin receptor gene HTR2A in women with fibromyalgia. METHODS In this observational study of case-control type 48 women were evaluated who belonged to the group with FM (52 ± 12 years) and 100 women in the control group (58 ± 11 years). Socio demographic and anthropometric data were collected and peripheral blood samples for DNA extraction; genotypic analyzes were performed by means of PCR in real time by TaqMan® system. The lower limb muscle strength was assessed through the test of sitting down and standing up for 30 s. The chi-square test or Fischer Exact was used for possible associations among the variables; the t-test for independent samples was used to compare the averages among the groups; the value of significance adopted was 5%. RESULTS There was an association between the polymorphism of the HTR2A gene with FM, demonstrating that carriers of the genotype GG have 24.39 times more likely to develop the syndrome (IC95% 5.15-115.47; p = 0.01). It was observed an association between FM and the test to sit and stand up demonstrating that women with fibromyalgia have lower limb muscle strength (p = 0.01). The study showed that the white race has 3.84 times more likely to develop FM (p = 0.01). CONCLUSION The results of this study suggest that women of Caucasian ethnicity with GG genotype or G allele presented greater risk of developing fibromyalgia and that these patients have lower limb muscle strength compared to the control group.
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Affiliation(s)
- Luana Oliveira de Lima
- Rehabilitation Sciences State University of Londrina and University Pitágoras Unopar (UEL/UNOPAR), Londrina, PR, Brazil.,Departament of Physical Education and Sport, Londrina State University (UEL), Londrina, Paraná, Brazil.,Laboratory of Molecular Biology, Biological and Health Sciences Center, University Pitágoras Unopar, Rua Marselha, 591 Jardim Piza, CEP, Londrina, PR, 86041-140, Brazil
| | - Carlos Alexandre Martins Zicarelli
- Rehabilitation Sciences State University of Londrina and University Pitágoras Unopar (UEL/UNOPAR), Londrina, PR, Brazil.,Departament of Physical Education and Sport, Londrina State University (UEL), Londrina, Paraná, Brazil.,Laboratory of Molecular Biology, Biological and Health Sciences Center, University Pitágoras Unopar, Rua Marselha, 591 Jardim Piza, CEP, Londrina, PR, 86041-140, Brazil
| | - Andressa Saori Matsumura
- Laboratory of Molecular Biology, Biological and Health Sciences Center, University Pitágoras Unopar, Rua Marselha, 591 Jardim Piza, CEP, Londrina, PR, 86041-140, Brazil
| | - Layse Rafaela Moroti-Perugini
- Rehabilitation Sciences State University of Londrina and University Pitágoras Unopar (UEL/UNOPAR), Londrina, PR, Brazil.,Departament of Physical Education and Sport, Londrina State University (UEL), Londrina, Paraná, Brazil.,Laboratory of Molecular Biology, Biological and Health Sciences Center, University Pitágoras Unopar, Rua Marselha, 591 Jardim Piza, CEP, Londrina, PR, 86041-140, Brazil
| | | | - Karen Barros Parron Fernandes
- Rehabilitation Sciences State University of Londrina and University Pitágoras Unopar (UEL/UNOPAR), Londrina, PR, Brazil.,Departament of Physical Education and Sport, Londrina State University (UEL), Londrina, Paraná, Brazil
| | - Priscila Daniele de Oliveira Perrucini
- Departament of Physical Education and Sport, Londrina State University (UEL), Londrina, Paraná, Brazil.,Laboratory of Molecular Biology, Biological and Health Sciences Center, University Pitágoras Unopar, Rua Marselha, 591 Jardim Piza, CEP, Londrina, PR, 86041-140, Brazil.,University Anhanguera - UNIDERP (Universidade para o Desenvolvimento do Estado e da Região do Pantanal), Campo Grande, Mato Grosso do Sul, Brazil
| | - Regina Célia Poli-Frederico
- Rehabilitation Sciences State University of Londrina and University Pitágoras Unopar (UEL/UNOPAR), Londrina, PR, Brazil. .,Departament of Physical Education and Sport, Londrina State University (UEL), Londrina, Paraná, Brazil. .,Laboratory of Molecular Biology, Biological and Health Sciences Center, University Pitágoras Unopar, Rua Marselha, 591 Jardim Piza, CEP, Londrina, PR, 86041-140, Brazil.
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Kaur G, Gupta D, Chavan BS, Sinhmar V, Prasad R, Tripathi A, Garg PD, Gupta R, Khurana H, Gautam S, Margoob MA, Aneja J. Identification of genetic correlates of response to Risperidone: Findings of a multicentric schizophrenia study from India. Asian J Psychiatr 2017; 29:174-182. [PMID: 28692863 DOI: 10.1016/j.ajp.2017.07.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 05/30/2017] [Accepted: 07/04/2017] [Indexed: 01/18/2023]
Abstract
Risperidone is most commonly used as an antipsychotic in India for treatment of schizophrenia. However, the response to treatment with risperidone is affected by many factors, genetic factors being one of them. So, we attempted to evaluate the association between dopamine D2 (DRD2) receptor, serotonergic (5HT2A) receptor and CYP2D6 gene polymorphisms and response to treatment with risperidone in persons with schizophrenia from North India. It was a multicentric 12-weeks prospective study, undertaken in patients diagnosed with schizophrenia according to International Classification of Diseases 10th revision, Diagnostic Criteria for Research module (ICD-10 DCR). Patients were treated with incremental dosages of risperidone. Nine gene polymorphisms from three genes viz. DRD2, 5-HT2A and CYP2D6 along with socio-demographical and clinical variables were analyzed to ascertain the association in response to risperidone treatment. The change in the Positive and Negative Syndrome Scale (PANSS) was used to measure the outcome. Significant differences in the frequencies of single nucleotide proteins (SNPs) rs180498 (Taq1D) and rs 6305 (C516T) polymorphisms were found amongst the groups defined according to percent decline in PANSS. The CYP2D6*4 polymorphism differed significantly when drop outs were excluded from analysis. Presence of DRD2 Taq 1 D2D2 and 5-HT2A C516T CT genotypes in patients were more likely to be associated with non-response to risperidone. Ser311Cys (rs1801028) mutation was absent in the North Indian patients suffering from schizophrenia.
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Affiliation(s)
- Gurjit Kaur
- Department of Physiology, Government Medical College & Hospital, Sector 32, Chandigarh, India
| | - Deepti Gupta
- Genetic Centre, Government Medical College & Hospital, Sector 32, Chandigarh, India
| | - Bir Singh Chavan
- Department of Psychiatry, Government Medical College & Hospital, Sector 32, Chandigarh, India
| | - Vikas Sinhmar
- Genetic Centre, Government Medical College & Hospital, Sector 32, Chandigarh, India
| | - Rajendra Prasad
- Department of Biochemistry, Postgraduate Institute of Medical Education & Research, Sector 12, Chandigarh, India
| | - Adarsh Tripathi
- Department of Psychiatry, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - P D Garg
- Department of Psychiatry, Government Medical College, Amritsar, Punjab, India
| | - Rajiv Gupta
- Department of Psychiatry, Postgraduate Institute of Medical Sciences, Rohtak, Haryana, India
| | - Hitesh Khurana
- Department of Psychiatry, Postgraduate Institute of Medical Sciences, Rohtak, Haryana, India
| | - Shiv Gautam
- Department of Psychiatry, SMS Medical College, Jaipur, Rajasthan, India
| | - Mushtaq Ahmed Margoob
- Department of Psychiatry, Government Medical College, Srinagar, Jammu & Kashmir, India
| | - Jitender Aneja
- Department of Psychiatry, Government Medical College & Hospital, Sector 32, Chandigarh, India.
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Sun L, Xu P, Zhou YG, Zuo SR, Liu YP. Meta-analysis of polymorphism rs6311 and rs6313 in the 5-HT 2AR gene and schizophrenia. Nord J Psychiatry 2017; 71:1-11. [PMID: 27598719 DOI: 10.1080/08039488.2016.1217350] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND rs6311 and rs6313 polymorphism of 5-hydroxytryptamine 2A receptor has been widely studied regarding association with susceptibility to schizophrenia, but the results remained inconsistent. AIMS This study aimed to assess the association between rs6311 and rs6313 polymorphism and schizophrenia using a meta-analysis. METHODS Pubmed, Web of Science, and Embase databases were searched for all articles linking rs6311 and rs6313 polymorphism and schizophrenia. All studies which met the inclusion and exclusion criteria were included in this meta-analysis. Pooled odds ratio and 95% confidence intervals were used to evaluate the association between rs6311 and rs6313 polymorphism and schizophrenia risk. Sub-group analysis was also performed by different ethnic studies (Asian and Caucasian) and different minor allelic studies (rs6311: minor allele = A and minor allele = G; rs6313: minor allele = T and minor allele = C). RESULTS Forty articles, including 50 case-control studies, were included in this meta-analysis. Specifically, 12 studies with 4100 cases and 4541 controls involved rs6311, 38 studies with 8960 cases and 9729 controls involved rs6313. The results showed that rs6311 and rs6313 were not associated with schizophrenia. Moreover, no associations were found between rs6311 and schizophrenia in different sub-groups, rs6313 was found to associated with schizophrenia among studies in which C is the minor allele. CONCLUSIONS This meta-analysis indicates that rs6311 and rs6313 polymorphisms of 5-HT2AR are not associated with schizophrenia. However, the rs6313 polymorphism is associated with schizophrenia in studies in which the minor allele is C.
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Affiliation(s)
- Li Sun
- a Department of Pharmacy , the Second Xiangya Hospital, Central South University , Changsha , PR China.,b Institute of Clinical Pharmacy , Central South University , Changsha , PR China.,c Department of Pharmacy , the Maternal and Child Health Hospital of Human Province , Changsha , PR China
| | - Ping Xu
- a Department of Pharmacy , the Second Xiangya Hospital, Central South University , Changsha , PR China.,b Institute of Clinical Pharmacy , Central South University , Changsha , PR China
| | - Yan-Gang Zhou
- a Department of Pharmacy , the Second Xiangya Hospital, Central South University , Changsha , PR China.,b Institute of Clinical Pharmacy , Central South University , Changsha , PR China
| | - Shan-Ru Zuo
- d Center of Clinical Pharmacology and Pharmacy Department , the Third Xiangya Hospital, Central South University , Changsha , PR China
| | - Yi-Ping Liu
- a Department of Pharmacy , the Second Xiangya Hospital, Central South University , Changsha , PR China.,b Institute of Clinical Pharmacy , Central South University , Changsha , PR China
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Abstract
Recent studies have shown an association between gene alterations by epigenetic mechanisms and suicidal behavior. These epigenetic mechanisms are mitotically, and in some cases meiotically, heritable changes in the genome through non-DNA sequence coding processes that alter gene expression as a result of variable changes in environmental stimuli. Genome-wide association studies have been inconsistent in elucidating the association between genes and suicidal behavior, thereby making the heritability of suicidal behavior is unclear. However, recent epigenetic studies have provided evidence that epigenetic mechanisms could deliver the missing link between the heritability of suicidal behavior and the interaction between environment and the genome. The present review provides an in-depth discussion of epigenetic mechanisms that may regulate gene expression in suicidal behavior. The findings of current epigenetic studies on suicidal behavior will also be discussed considering future epigenome-wide association studies on elucidating the contributions of environment and genome on suicidal behavior.
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Affiliation(s)
- Ali Bani-Fatemi
- a Group for Suicide Studies, CAMH, Department of Psychiatry , University of Toronto , Toronto , Canada
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Tan J, Chen S, Su L, Long J, Xie J, Shen T, Jiang J, Gu L. Association of the T102C polymorphism in the HTR2A gene with major depressive disorder, bipolar disorder, and schizophrenia. Am J Med Genet B Neuropsychiatr Genet 2014; 165B:438-55. [PMID: 24962835 DOI: 10.1002/ajmg.b.32248] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2013] [Accepted: 05/23/2014] [Indexed: 12/12/2022]
Abstract
A number of studies have assessed a relationship between the T102C polymorphism in the HTR2A gene with an increased risk of major depressive disorder (MDD), bipolar disorder (BPD), and schizophrenia (SCZ). However, the results have been inconsistent. Hence, we performed this study to further evaluate potential associations between the T102C polymorphism and MDD, BPD, and SCZ. The strength of separate associations between the T102C polymorphism and the risk of MDD, BPD, or SCZ was measured by ORs and 95% confidence intervals (CIs) in six genetic models. Cochran's chi-square-based Q-statistic and I(2) were used to evaluate the heterogeneity between studies. The funnel plot and the Egger's test were used to assess the publication bias. Cumulative meta-analysis was also performed to evaluate the trend in OR over time. No significant association was found in the overall analysis of MDD, BPD and SCZ with a sample size of 17,178 cases and 20,855 control subjects. In a further analysis by ethnicity, the OR and 95% CIs indicated the T102C polymorphism was not associated with MDD, BPD, or SCZ in Caucasian, Asian or Chinese populations. No publication bias was observed in the meta-analysis, and the cumulative analyses indicated the robust stability of the results. Thus, the results of our study indicate that the T102C polymorphism is not associates with increased susceptibility to MDD, BPD, and SCZ.
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Affiliation(s)
- Jinjing Tan
- Department of Internal Neurology, First Affiliated Hospital, Guangxi University of Chinese Medicine, 89-9 Dongge Road, Nanning, Guangxi, China
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The role of the serotonergic system at the interface of aggression and suicide. Neuroscience 2013; 236:160-85. [PMID: 23333677 DOI: 10.1016/j.neuroscience.2013.01.015] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 01/01/2013] [Accepted: 01/05/2013] [Indexed: 02/07/2023]
Abstract
Alterations in serotonin (5-HT) neurochemistry have been implicated in the aetiology of all major neuropsychiatric disorders, ranging from schizophrenia to mood and anxiety-spectrum disorders. This review will focus on the multifaceted implications of 5-HT-ergic dysfunctions in the pathophysiology of aggressive and suicidal behaviours. After a brief overview of the anatomical distribution of the 5-HT-ergic system in the key brain areas that govern aggression and suicidal behaviours, the implication of 5-HT markers (5-HT receptors, transporter as well as synthetic and metabolic enzymes) in these conditions is discussed. In this regard, particular emphasis is placed on the integration of pharmacological and genetic evidence from animal studies with the findings of human experimental and genetic association studies. Traditional views postulated an inverse relationship between 5-HT and aggression and suicidal behaviours; however, ample evidence has shown that this perspective may be overly simplistic, and that such pathological manifestations may reflect alterations in 5-HT homoeostasis due to the interaction of genetic, environmental and gender-related factors, particularly during early critical developmental stages. The development of animal models that may capture the complexity of such interactions promises to afford a powerful tool to elucidate the pathophysiology of impulsive aggression and suicidability, and identify new effective therapies for these conditions.
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González-Castro TB, Tovilla-Zárate C, Juárez-Rojop I, Pool García S, Velázquez-Sánchez MP, Genis A, Nicolini H, López Narváez L. Association of the 5HTR2A gene with suicidal behavior: case-control study and updated meta-analysis. BMC Psychiatry 2013; 13:25. [PMID: 23311440 PMCID: PMC3558434 DOI: 10.1186/1471-244x-13-25] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Accepted: 01/11/2013] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND The polymorphism rs6313 (T102C) has been associated with suicidal behavior in case-control and meta-analysis studies, but results and conclusions remain controversial. The aim of the present study was to examine the association between T102C with suicidal behavior in a case-control study and, to assess the combined evidence - this case-control study and available data from other related studies - we carried out a meta-analysis. METHODS We conducted a case-control study that included 161 patients with suicide attempts and 244 controls; we then performed a meta-analysis. The following models were evaluated in the meta-analysis: A) C allele vs T allele; B) T allele vs C allele; C) Caucasian population, D) Asian population, and E) suicide attempters with schizophrenia. RESULTS We found an association between attempted suicide and control participants for genotype (χ2=6.28, p=0.04, df=2) and allele (χ2=6.17, p=0.01, df=1, OR 1.48 95% IC: 1.08-2.03) frequencies in the case-control study. The meta-analysis, comprising 23 association studies (including the present one), showed that the rs6313 polymorphism is not associated with suicidal behavior for the following comparisons:T allele vs C allele (OR: 1.03; 95% CI 0.93-1.13; p(Z)=0.44); C allele vs T allele: (OR:0.99; 95% CI: 0.90-1.08; p(Z)=0.22); Caucasians (OR:1.09; 95% CI: 0.96-1.23), and Asians (OR:0.96; 95% CI: 0.84-1.09). CONCLUSION Our results showed association between the rs6313 (T102C) polymorphism and suicidal behavior in the case-control study. However, the meta-analysis showed no evidence of association. Therefore, more studies are necessary to determine conclusively an association between T102C and suicidal behavior.
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Affiliation(s)
| | - Carlos Tovilla-Zárate
- División Multidisciplinaria de Comalcalco, Universidad Juárez Autónoma de Tabasco, Comalcalco, Tabasco, México,División Académica Multidisciplinaria de Comalcalco, Ranchería Sur, Cuarta Sección, C.P. 86650, Comalcalco, Tabasco, México
| | - Isela Juárez-Rojop
- División Académica de Ciencias de la Salud, Universidad Juárez Autónoma de Tabasco, Villahermosa, Tabasco, México
| | - Sherezada Pool García
- Hospital General de Comalcalco, Tabasco, Secretaría de Salud, Comalcalco, Tabasco, México
| | | | - Alma Genis
- Grupo de Estudios Médicos y Familiares Carracci, México, DF, México
| | | | - Lilia López Narváez
- CIGEN, Centro de Investigación Genómica, Comalcalco, Tabasco, México,Hospital General de Yajalón, Yajalón, Chiapas, México
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Pavlov KA, Chistiakov DA, Chekhonin VP. Genetic determinants of aggression and impulsivity in humans. J Appl Genet 2011; 53:61-82. [PMID: 21994088 DOI: 10.1007/s13353-011-0069-6] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2011] [Revised: 09/24/2011] [Accepted: 09/26/2011] [Indexed: 12/13/2022]
Abstract
Human aggression/impulsivity-related traits have a complex background that is greatly influenced by genetic and non-genetic factors. The relationship between aggression and anxiety is regulated by highly conserved brain regions including amygdala, which controls neural circuits triggering defensive, aggressive, or avoidant behavioral models. The dysfunction of neural circuits responsible for emotional control was shown to represent an etiological factor of violent behavior. In addition to the amygdala, these circuits also involve the anterior cingulated cortex and regions of the prefrontal cortex. Excessive reactivity in the amygdala coupled with inadequate prefrontal regulation serves to increase the likelihood of aggressive behavior. Developmental alterations in prefrontal-subcortical circuitry as well as neuromodulatory and hormonal abnormality appear to play a role. Imbalance in testosterone/serotonin and testosterone/cortisol ratios (e.g., increased testosterone levels and reduced cortisol levels) increases the propensity toward aggression because of reduced activation of the neural circuitry of impulse control and self-regulation. Serotonin facilitates prefrontal inhibition, and thus insufficient serotonergic activity can enhance aggression. Genetic predisposition to aggression appears to be deeply affected by the polymorphic genetic variants of the serotoninergic system that influences serotonin levels in the central and peripheral nervous system, biological effects of this hormone, and rate of serotonin production, synaptic release and degradation. Among these variants, functional polymorphisms in the monoamine oxidase A (MAOA) and serotonin transporter (5-HTT) may be of particular importance due to the relationship between these polymorphic variants and anatomical changes in the limbic system of aggressive people. Furthermore, functional variants of MAOA and 5-HTT are capable of mediating the influence of environmental factors on aggression-related traits. In this review, we consider genetic determinants of human aggression, with special emphasis on genes involved in serotonin and dopamine metabolism and function.
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Affiliation(s)
- Konstantin A Pavlov
- Department of Fundamental and Applied Neurobiology, Serbsky State Research Center of Forensic and Social Psychiatry, Kropotkinsky Pereulok 23, Moscow, Russia
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Abstract
Genetic epidemiology research has shown that genes contribute to suicide risk. Unfortunately, the first 30 years of candidate-based association studies have provided little information about the specific genetic contributors. This article reviews genetic association studies of suicidal phenotypes published to date. Possible theoretical, methodological, and operational challenges accounting for the modest success of association studies in the field are also discussed. The authors conclude that future research may benefit from using a more systematic and comprehensive selection of candidate genes and variants, examining gene-environment and gene-gene interactions, and investigating higher-order moderators.
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Affiliation(s)
- Jelena Brezo
- Department of Psychiatry, McGill Group for Suicide Studies, 6875 La Salle Boulevard, Montreal, Quebec, H4H 1R3, Canada
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