The Open Neurology Journal




ISSN: 1874-205X ― Volume 14, 2020
RESEARCH ARTICLE

Association Between a Functional Polymorphism in the Monoamine Oxidase A (MAOA) Gene and Both Emotional Coping Style and Neuroticism



Diego A. Forero1, 5, *, Ana Adan2, 3, Sandra Lopez-Leon4
1 Laboratory of Neuropsychiatric Genetics, Biomedical Sciences Research Group, School of Medicine, Universidad Antonio Nariño, Bogotá, Colombia
2 Department of Clinical Psychology and Psychobiology, School of Psychology, University of Barcelona, Barcelona, Spain
3 Institute of Neurosciences, University of Barcelona, Barcelona, Spain
4 Novartis Pharmaceuticals Corporation, One Health Plaza, East Hanover, NJ, USA
5 School of Health and Sport Sciences, Fundación Universitaria del Área Andina, Bogotá, Colombia

Abstract

Background:

Identification of novel genetic factors for Depressive Disorders (DD) represents a major challenge around the world. Molecular studies of endophenotypes associated with DD, such as personality traits and coping, are powerful strategies for finding genetic markers.

Objective:

The main objective of this work was to confirm the potential relationship between a functional polymorphism in the monoamine oxidase A (MAOA) gene and scores in coping and neuroticism in young adults.

Methods:

A Colombian sample of two hundred fifty-one young participants was evaluated with the short forms of the Coping Inventory for Stressful Situations (CISS-SF) and the Big Five Inventory (BFI-S). Genotypes for MAOA-VNTR polymorphism were obtained by PCR.

Results:

A significant relationship between the functional MAOA-VNTR polymorphism and scores in both emotion-oriented coping and neuroticism was found. Individuals carrying the 4 allele (3/4 or 4/4 genotypes) had higher scores for both emotion-oriented coping and neuroticism than individuals with a 3/3 genotype.

Conclusion:

Our current findings are novel in terms of being the first report of a relationship between a functional polymorphism in the MAOA gene and coping and add evidence to the association of this gene with neuroticism. Our results expand the associations between MAOA gene and multiple dimensions of human emotion and personality.

Keywords: Neurogenetics , Mental health , Psychological factors , Personality , Psychiatric disorders , Latin America .


Article Information


Identifiers and Pagination:

Year: 2020
Volume: 14
First Page: 10
Last Page: 14
Publisher Id: TONEUJ-14-10
DOI: 10.2174/1874205X02014010010

Article History:

Received Date: 04/02/2020
Revision Received Date: 05/05/2020
Acceptance Date: 11/05/2020
Electronic publication date: 16/06/2020
Collection year: 2020

© 2020 Forero et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at the School of Health and Sport Sciences, Fundación Universitaria del Área Andina, Bogotá, Colombia; Tel: +57 313 610427; Email: dforero41@areandina.edu.co





1. INTRODUCTION

The identification of genetic risk factors for Depressive Disorders (DD) represents a major challenge around the world [1Dunn EC, Brown RC, Dai Y, et al. Genetic determinants of depression: recent findings and future directions. Harv Rev Psychiatry 2015; 23(1): 1-18.
[http://dx.doi.org/10.1097/HRP.0000000000000054] [PMID: 25563565]
-3López-León S, Janssens AC, González-Zuloeta Ladd AM, et al. Meta-analyses of genetic studies on major depressive disorder. Mol Psychiatry 2008; 13(8): 772-85.
[http://dx.doi.org/10.1038/sj.mp.4002088] [PMID: 17938638]
]. There is the need for more studies to find the molecular risk factors and pathophysiological mechanisms underlying DD [3López-León S, Janssens AC, González-Zuloeta Ladd AM, et al. Meta-analyses of genetic studies on major depressive disorder. Mol Psychiatry 2008; 13(8): 772-85.
[http://dx.doi.org/10.1038/sj.mp.4002088] [PMID: 17938638]
, 4Forero DA, Guio-Vega GP, González-Giraldo Y. A comprehensive regional analysis of genome-wide expression profiles for major depressive disorder. J Affect Disord 2017; 218: 86-92.
[http://dx.doi.org/10.1016/j.jad.2017.04.061] [PMID: 28460316]
]. Genetic studies of the endophenotypes associated with DD, such as personality traits and coping, are useful for the identification of candidate genes [1Dunn EC, Brown RC, Dai Y, et al. Genetic determinants of depression: recent findings and future directions. Harv Rev Psychiatry 2015; 23(1): 1-18.
[http://dx.doi.org/10.1097/HRP.0000000000000054] [PMID: 25563565]
].

Personality traits have been studied extensively for decades, using approaches from psychology, neurosciences and genetics [5Adan A, Forero DA, Navarro JF. Personality Traits Related to Binge Drinking: A Systematic Review. Front Psychiatry 2017; 8: 134.
[http://dx.doi.org/10.3389/fpsyt.2017.00134] [PMID: 28804465]
, 6Sanchez-Roige S, Gray JC, MacKillop J, Chen CH, Palmer AA. The genetics of human personality. Genes Brain Behav 2018; 17(3)e12439
[http://dx.doi.org/10.1111/gbb.12439] [PMID: 29152902]
]. The association of different personality dimensions with psychopathology has been explored in multiple populations around the world [6Sanchez-Roige S, Gray JC, MacKillop J, Chen CH, Palmer AA. The genetics of human personality. Genes Brain Behav 2018; 17(3)e12439
[http://dx.doi.org/10.1111/gbb.12439] [PMID: 29152902]
]. Particularly, neuroticism has been strongly associated with DD, among other psychiatric disorders [6Sanchez-Roige S, Gray JC, MacKillop J, Chen CH, Palmer AA. The genetics of human personality. Genes Brain Behav 2018; 17(3)e12439
[http://dx.doi.org/10.1111/gbb.12439] [PMID: 29152902]
]. An important number of genes, such as DRD4 and SLC6A4, have been explored as possible molecular correlates for neuroticism in samples of healthy individuals [6Sanchez-Roige S, Gray JC, MacKillop J, Chen CH, Palmer AA. The genetics of human personality. Genes Brain Behav 2018; 17(3)e12439
[http://dx.doi.org/10.1111/gbb.12439] [PMID: 29152902]
].

Coping strategies represent important approaches for managing stressful situations, with major implications for the risk for psychopathology and for normal life activities [7Dunn SH, Conley YP. A systematic review of genetic influences on coping. Biol Res Nurs 2015; 17(1): 87-93.
[http://dx.doi.org/10.1177/1099800414527340] [PMID: 25504954]
]. When an individual is confronted with a stressful situation in life, his/her coping strategy (among other factors) plays a role in the ability to adequately adapt to the situation. Some individuals tend to use emotions, others are avoidant and others are more task-oriented. Individuals who are neurotic and who tend to use an emotion-oriented coping style are more likely to suffer from a mood disorder [8McWilliams LA, Cox BJ, Enns MW. Use of the Coping Inventory for Stressful Situations in a clinically depressed sample: factor structure, personality correlates, and prediction of distress. J Clin Psychol 2003; 59(4): 423-37.
[http://dx.doi.org/10.1002/jclp.10080] [PMID: 12652635]
, 9Christensen MV, Kessing LV. Clinical use of coping in affective disorder, a critical review of the literature. Clin Pract Epidemiol Ment Health 2005; 1(1): 20.
[http://dx.doi.org/10.1186/1745-0179-1-20] [PMID: 16212656]
]. It has been found that coping has a moderate heritability; however, few studies have analyzed genetic factors associated with coping in healthy individuals [7Dunn SH, Conley YP. A systematic review of genetic influences on coping. Biol Res Nurs 2015; 17(1): 87-93.
[http://dx.doi.org/10.1177/1099800414527340] [PMID: 25504954]
].

Polymorphisms in multiple genes that are involved in the dopaminergic and serotoninergic systems have been postulated as novel candidates for DD, considering the role of these circuits in neural processes related to emotion, motivation and reward [3López-León S, Janssens AC, González-Zuloeta Ladd AM, et al. Meta-analyses of genetic studies on major depressive disorder. Mol Psychiatry 2008; 13(8): 772-85.
[http://dx.doi.org/10.1038/sj.mp.4002088] [PMID: 17938638]
]. The monoamine oxidase A (MAOA) has a major role in the regulation of levels of dopamine, norepinephrine, and serotonin neurotransmitters [10Shih JC, Wu JB, Chen K. Transcriptional regulation and multiple functions of MAO genes. J Neural Transm (Vienna) 2011; 118(7): 979-86.
[http://dx.doi.org/10.1007/s00702-010-0562-9] [PMID: 21359973]
]. The MAOA gene is located at the Xp.11.4–Xp11.3 genomic region, with a length of 90,660 bp and it is expressed in several brain regions [11Liu Z, Huang L, Luo XJ, Wu L, Li M. MAOA Variants and Genetic Susceptibility to Major Psychiatric Disorders. Mol Neurobiol 2016; 53(7): 4319-27.
[http://dx.doi.org/10.1007/s12035-015-9374-0] [PMID: 26227907]
]. A functional variable-number tandem repeat (VNTR) has been found in the promoter region of MAOA gene (MAOA-uVNTR), involving a 30 bp repeat sequence [12Sabol SZ, Hu S, Hamer D. A functional polymorphism in the monoamine oxidase A gene promoter. Hum Genet 1998; 103(3): 273-9.
[http://dx.doi.org/10.1007/s004390050816] [PMID: 9799080]
]. The polymorphism consists of 2, 3, 3.5, 4 and 5 30 bp repeats, being the 3 and 4 alleles more common. Some studies group the short forms (3 repeats and shorter) and the long alleles (3.5, repeats and longer). Functional studies have shown that MAOA gene transcription is regulated by this VNTR, with the four repeat alleles (or longer alleles) associated with higher expression levels [10Shih JC, Wu JB, Chen K. Transcriptional regulation and multiple functions of MAO genes. J Neural Transm (Vienna) 2011; 118(7): 979-86.
[http://dx.doi.org/10.1007/s00702-010-0562-9] [PMID: 21359973]
, 13Deckert J, Catalano M, Syagailo YV, et al. Excess of high activity monoamine oxidase A gene promoter alleles in female patients with panic disorder. Hum Mol Genet 1999; 8(4): 621-4.
[http://dx.doi.org/10.1093/hmg/8.4.621] [PMID: 10072430]
]. This functional polymorphism has been studied as a possible candidate for a number of neuropsychiatric disorders and a meta-analysis has found that variants in the MAOA gene could play an important role in the molecular mechanisms of response to behavioral stress and development of psychopathology [14Kim-Cohen J, Caspi A, Taylor A, et al. MAOA, maltreatment, and gene-environment interaction predicting children’s mental health: new evidence and a meta-analysis. Mol Psychiatry 2006; 11(10): 903-13.
[http://dx.doi.org/10.1038/sj.mp.4001851] [PMID: 16801953]
]. A polymorphism in the MAOA gene (rs1137070) was found as associated with major depressive disorder in females in a recent meta-analysis [11Liu Z, Huang L, Luo XJ, Wu L, Li M. MAOA Variants and Genetic Susceptibility to Major Psychiatric Disorders. Mol Neurobiol 2016; 53(7): 4319-27.
[http://dx.doi.org/10.1007/s12035-015-9374-0] [PMID: 26227907]
]. The MAOA gene has been analyzed previously as a candidate for neuroticism in populations of European and Asian descent, with conflicting results (Table 1) [15Eley TC, Tahir E, Angleitner A, et al. Association analysis of MAOA and COMT with neuroticism assessed by peers. American journal of medical genetics. Part B, Neuropsychiatric genetics. Int Soc Psychiatric Genetics 2003; 120B(1): 90-6., 16Xu MK, Gaysina D, Tsonaka R, et al. Monoamine Oxidase A (MAOA) Gene and Personality Traits from Late Adolescence through Early Adulthood: A Latent Variable Investigation. Front Psychol 2017; 8: 1736.
[http://dx.doi.org/10.3389/fpsyg.2017.01736] [PMID: 29075213]
].

The main objective of the current work was to confirm the potential relationship between the functional polymorphism in the MAOA gene and scores in neuroticism and coping instruments in a sample of Colombian adults.

2. MATERIALS AND METHODS

2.1. Participants

This work included a total of two hundred fifty one young adults, who were living in Bogotá, the capital city of Colombia [17Jiménez KM, Pereira-Morales AJ, Forero DA. Higher scores in the extraversion personality trait are associated with a functional polymorphism in the PER3 gene in healthy subjects. Chronobiol Int 2017; 34(2): 280-6.
[http://dx.doi.org/10.1080/07420528.2016.1268149] [PMID: 28055273]
, 18Pereira-Morales AJ, Adan A, Lopez-Leon S, Forero DA. Personality traits and health-related quality of life: the mediator role of coping strategies and psychological distress. Ann Gen Psychiatry 2018; 17: 25.
[http://dx.doi.org/10.1186/s12991-018-0196-0] [PMID: 29930692]
]. They participated in the study after being invited in person or by email. This research work was approved by the local institutional ethics committee (Universidad Antonio Nariño, 07-06-2015) and all individuals who participated in this study signed a written informed consent.

2.2. Assessment of Neuroticism and Coping

The Big Five Inventory (BFI-S; 15-items) was employed to evaluate personality dimensions [19Lang FR, John D, Lüdtke O, Schupp J, Wagner GG. Short assessment of the Big Five: robust across survey methods except telephone interviewing. Behav Res Methods 2011; 43(2): 548-67.
[http://dx.doi.org/10.3758/s13428-011-0066-z] [PMID: 21424189]
]. The Big Five personality trait model is one of the most established and used approaches to measure individual differences in personality. This inventory is based on self-report and measures five dimensions of personality: N (Neuroticism), E (Extraversion), O (Openness to experience), C (Conscientiousness) and A (Agreeableness), on a Likert scale of 7-points. It has been widely used in several countries, such as Spain and Colombia [17Jiménez KM, Pereira-Morales AJ, Forero DA. Higher scores in the extraversion personality trait are associated with a functional polymorphism in the PER3 gene in healthy subjects. Chronobiol Int 2017; 34(2): 280-6.
[http://dx.doi.org/10.1080/07420528.2016.1268149] [PMID: 28055273]
, 18Pereira-Morales AJ, Adan A, Lopez-Leon S, Forero DA. Personality traits and health-related quality of life: the mediator role of coping strategies and psychological distress. Ann Gen Psychiatry 2018; 17: 25.
[http://dx.doi.org/10.1186/s12991-018-0196-0] [PMID: 29930692]
] and had an adequate internal consistency in this sample.

The Short Form of the Coping Inventory for Stressful Situations (CISS-SF, with 21 items) was used for the analysis of coping [20Inostroza C, Cova F, Bustos C, Quijada Y. Desesperanza y afrontamiento centrado en la tarea median la relación entre sintomatologia depresiva y conducta suicida no letal en pacientes de salud mental. Rev Chil Neuro-psiquiatr 2015; 53(4): 231-40.
[http://dx.doi.org/10.4067/S0717-92272015000400003]
]. This tool assesses three coping styles (task-oriented, emotional, and avoidant). CISS-SF items exemplify different ways of coping in a stressful situation. It has been previously used in the Spanish language [18Pereira-Morales AJ, Adan A, Lopez-Leon S, Forero DA. Personality traits and health-related quality of life: the mediator role of coping strategies and psychological distress. Ann Gen Psychiatry 2018; 17: 25.
[http://dx.doi.org/10.1186/s12991-018-0196-0] [PMID: 29930692]
] and had an adequate internal consistency in this sample (Cronbach's alpha coefficients for BFI-S and CISS-SF were adequate).

Table 1
Overview of previous studies on neuroticism and related dimensions (such as harm avoidance) and MAOA gene in different populations *.


2.3. Genotyping

Four hundred µl of peripheral venous blood were used for the extraction of genomic DNA, with the implementation of a protocol based on salting out. A Qubit 2.0 equipment (Thermo Fisher Scientific, MA, USA) was used for DNA quantification, employing a Qubit dsDNA BR assay kit (Thermo Fisher Scientific). The DNA aliquots were normalized to 10 ng/µl and stored at the fridge (at 4°C) until they were analyzed. The genotyping for the MAOA-uVNTR polymorphism was done, as it has been previously reported by Sabol et al.. [12Sabol SZ, Hu S, Hamer D. A functional polymorphism in the monoamine oxidase A gene promoter. Hum Genet 1998; 103(3): 273-9.
[http://dx.doi.org/10.1007/s004390050816] [PMID: 9799080]
]. This genotyping protocol based on PCR used two previously described primers (MAOA-F: ACA GCC TGA CCG TGG AGA AG and MAOA-R: GAA CGG ACG CTC CAT TCG GA). Two common alleles have been reported for this VNTR polymorphism, based on the PCR size: 3 (324 bp) and 4 (354 bp). The PCR reaction included 1.5 µM of primers, 0.75 U of Taq polymerase (Bioline, London, United Kingdom) and 2 µl (20 ng) of genomic DNA, for a final volume of 20 µl, in a Labnet MultiGene 96- well thermal cycler (Labnet International Inc, Edison, NJ, USA). PCR products were analyzed by agarose gel electrophoresis (2% agarose) and the PCR products were visualized with a staining with SYBR Safe (Invitrogen, Carlsbad, CA). Sizes of the PCR products were estimated with the run of in parallel of commercial DNA size markers (HyperLadder V, Bioline). In order to validate the results of the genotyping process for the MAOA polymorphism, a subsample, randomly selected was reanalyzed and 2 independent researchers revised all genotypes [21Ojeda DA, Niño CL, López-León S, Camargo A, Adan A, Forero DA. A functional polymorphism in the promoter region of MAOA gene is associated with daytime sleepiness in healthy subjects. J Neurol Sci 2014; 337(1-2): 176-9.
[http://dx.doi.org/10.1016/j.jns.2013.12.005] [PMID: 24360188]
, 22Speck-Hernández CA, Ojeda DA, Castro-Vega LJ, Forero DA. Relative telomere length is associated with a functional polymorphism in the monoamine oxidase A gene in a South American sample. J Genet 2015; 94(2): 305-8.
[http://dx.doi.org/10.1007/s12041-015-0513-1] [PMID: 26174679]
].

2.4. Statistical Analysis

To assess the normal distributions of the CISS-SF and BFI-S scores, an analysis of skewness and kurtosis was used [23Kim HY. Statistical notes for clinical researchers: assessing normal distribution (2) using skewness and kurtosis. Restor Dent Endod 2013; 38(1): 52-4.
[http://dx.doi.org/10.5395/rde.2013.38.1.52] [PMID: 23495371]
]. These statistical analyses were conducted with the Statistical Package for the Social Sciences (SPSS v. 18). Allelic and genotype frequencies, Hardy-Weinberg equilibrium in females and the analysis of a possible association of the MAOA genotypes with the CISS-SF and BFI-S scores were calculated using the SNPStats program [24Solé X, Guinó E, Valls J, Iniesta R, Moreno V. SNPStats: a web tool for the analysis of association studies. Bioinformatics 2006; 22(15): 1928-9.
[http://dx.doi.org/10.1093/bioinformatics/btl268] [PMID: 16720584]
] (male hemizygous subjects were combined with female homozygous subjects), using a linear regression model, which was adjusted by age and gender [21Ojeda DA, Niño CL, López-León S, Camargo A, Adan A, Forero DA. A functional polymorphism in the promoter region of MAOA gene is associated with daytime sleepiness in healthy subjects. J Neurol Sci 2014; 337(1-2): 176-9.
[http://dx.doi.org/10.1016/j.jns.2013.12.005] [PMID: 24360188]
, 22Speck-Hernández CA, Ojeda DA, Castro-Vega LJ, Forero DA. Relative telomere length is associated with a functional polymorphism in the monoamine oxidase A gene in a South American sample. J Genet 2015; 94(2): 305-8.
[http://dx.doi.org/10.1007/s12041-015-0513-1] [PMID: 26174679]
].

3. RESULTS

Participants were at least 18 years or older, were unrelated and, according to self-report, did not have personal history of neuropsychiatric disorders. Subjects had a mean age of 21 years (SD= 1.4) and 75% were women. The socioeconomic status of the total sample (SES) was represented mainly by low (34%) and medium (46%) strata, according to self-report. Scores for both scales had a normal distribution (p>0.05). The only alleles found in the sample were 3 and 4. The 3 allele of MAOA-uVNTR was found in 36% of the sample. Genotype frequencies in females were in Hardy Weinberg equilibrium (p=0.33).

A significant association was found for MAOA-uVNTR and scores in emotion-oriented coping, with carriers of the 3/4 and 4/4 genotypes showing higher scores (p=0.009) (Table 2). A statistically significant association was also found between genotype groups of the MAOA-uVNTR and scores in neuroticism, with carriers of the 3/4 and 4/4 genotypes showing higher scores (p=0.02) (Table 2). No significant associations were found for the scores in the other dimensions of personality or copying.

Table 2
Association of a functional MAOA polymorphism with scores in neuroticism and emotion-oriented coping in a sample of Colombian subjects.


4. DISCUSSION

In the current work, we report the novel association of a functional polymorphism in the MAOA gene with scores in emotion-oriented coping and neuroticism, in a sample of young subjects. Our study is the first to report the significant association of a polymorphism in the MAOA gene and coping.

Several studies have analyzed the association of MAOA gene with neuroticism in populations of European and Asian descent [15Eley TC, Tahir E, Angleitner A, et al. Association analysis of MAOA and COMT with neuroticism assessed by peers. American journal of medical genetics. Part B, Neuropsychiatric genetics. Int Soc Psychiatric Genetics 2003; 120B(1): 90-6., 16Xu MK, Gaysina D, Tsonaka R, et al. Monoamine Oxidase A (MAOA) Gene and Personality Traits from Late Adolescence through Early Adulthood: A Latent Variable Investigation. Front Psychol 2017; 8: 1736.
[http://dx.doi.org/10.3389/fpsyg.2017.01736] [PMID: 29075213]
, 25Pełka-Wysiecka J, Ziętek J, Grzywacz A, Kucharska-Mazur J, Bienkowski P, Samochowiec J. Association of genetic polymorphisms with personality profile in individuals without psychiatric disorders. Prog Neuropsychopharmacol Biol Psychiatry 2012; 39(1): 40-6.
[http://dx.doi.org/10.1016/j.pnpbp.2012.04.009] [PMID: 22542868]
-27Tochigi M, Otowa T, Hibino H, et al. Combined analysis of association between personality traits and three functional polymorphisms in the tyrosine hydroxylase, monoamine oxidase A, and catechol-O-methyltransferase genes. Neurosci Res 2006; 54(3): 180-5.
[http://dx.doi.org/10.1016/j.neures.2005.11.003] [PMID: 16360899]
], with conflicting results (Table 1). The results of these studies are in line with our findings. Three studies showed that individuals with a 4-repeat genotype (or long forms of the allele) score higher in neuroticism or harm avoidance (a trait related to neuroticism). Eley et al. found an association of neuroticism reported by peers with the MAOA gene in German males only [15Eley TC, Tahir E, Angleitner A, et al. Association analysis of MAOA and COMT with neuroticism assessed by peers. American journal of medical genetics. Part B, Neuropsychiatric genetics. Int Soc Psychiatric Genetics 2003; 120B(1): 90-6.]; Yu et al. found an association with harm avoidance in Han Chinese [26Yu YW, Yang CW, Wu HC, et al. Association study of a functional MAOA-uVNTR gene polymorphism and personality traits in Chinese young females. Neuropsychobiology 2005; 52(3): 118-21.
[http://dx.doi.org/10.1159/000087556] [PMID: 16110245]
]; in a Japanese sample, no association was found by Tochigi et al. [27Tochigi M, Otowa T, Hibino H, et al. Combined analysis of association between personality traits and three functional polymorphisms in the tyrosine hydroxylase, monoamine oxidase A, and catechol-O-methyltransferase genes. Neurosci Res 2006; 54(3): 180-5.
[http://dx.doi.org/10.1016/j.neures.2005.11.003] [PMID: 16360899]
]; in a Polish sample, no association with neuroticism was found by Pełka-Wysiecka [25Pełka-Wysiecka J, Ziętek J, Grzywacz A, Kucharska-Mazur J, Bienkowski P, Samochowiec J. Association of genetic polymorphisms with personality profile in individuals without psychiatric disorders. Prog Neuropsychopharmacol Biol Psychiatry 2012; 39(1): 40-6.
[http://dx.doi.org/10.1016/j.pnpbp.2012.04.009] [PMID: 22542868]
]; in a British sample, no association was found by Xu et al. [16Xu MK, Gaysina D, Tsonaka R, et al. Monoamine Oxidase A (MAOA) Gene and Personality Traits from Late Adolescence through Early Adulthood: A Latent Variable Investigation. Front Psychol 2017; 8: 1736.
[http://dx.doi.org/10.3389/fpsyg.2017.01736] [PMID: 29075213]
].

The MAOA gene encodes a protein that is a key enzyme in the regulation of several neurotransmitters, such as dopamine, noradrenaline, and serotonin, which are fundamental for the regulation of sleep and other behavioral phenotypes [10Shih JC, Wu JB, Chen K. Transcriptional regulation and multiple functions of MAO genes. J Neural Transm (Vienna) 2011; 118(7): 979-86.
[http://dx.doi.org/10.1007/s00702-010-0562-9] [PMID: 21359973]
]. Studies using Maoa knockout mice models have established that its deficiency leads to neurochemical imbalances, which culminates in neuroanatomical abnormalities such as reduced thickness of corpus callosum, increased dendritic arborization of pyramidal neurons in the prefrontal cortex and disrupted microarchitecture of cerebellum [28Bortolato M, Godar SC, Alzghoul L, et al. Monoamine oxidase A and A/B knockout mice display autistic-like features. Int J Neuropsychopharmacol 2013; 16(4): 869-88.
[http://dx.doi.org/10.1017/S1461145712000715] [PMID: 22850464]
]. It has been demonstrated that the 4-repeat allele of the human MAOA-uVNTR is transcriptionally and enzymatically more active (2 to 10 times) than the 3-repeat allele [12Sabol SZ, Hu S, Hamer D. A functional polymorphism in the monoamine oxidase A gene promoter. Hum Genet 1998; 103(3): 273-9.
[http://dx.doi.org/10.1007/s004390050816] [PMID: 9799080]
]. A molecular genetic analysis of important psychological factors, such as coping and neuroticism, represents an important opportunity for the interdisciplinary study of variables that are associated with psychopathology and with normal functioning in healthy individuals [29Forero DA, Urriago H, Lopez-Leon S, González-Giraldo Y, De Miranda DM. Espinosa Jovel CA. Implementing Genomics in the Care of Neuropsychiatric Patients in Latin America. Genomic Medicine in Emerging Economies, (Eds) 2018; 101-30., 30Forero DA, Vélez-van-Meerbeke A, Deshpande SN, Nicolini H, Perry G. Neuropsychiatric genetics in developing countries: Current challenges. World J Psychiatry 2014; 4(4): 69-71.
[http://dx.doi.org/10.5498/wjp.v4.i4.69] [PMID: 25540721]
].

CONCLUSION

Our results are the first description in the scientific literature about the association of the MAOA gene and coping and this is the first report of the association of neuroticism and the MAOA gene in a Latin American sample. Future studies should analyze variants in MAOA gene and coping and neuroticism in other populations [29Forero DA, Urriago H, Lopez-Leon S, González-Giraldo Y, De Miranda DM. Espinosa Jovel CA. Implementing Genomics in the Care of Neuropsychiatric Patients in Latin America. Genomic Medicine in Emerging Economies, (Eds) 2018; 101-30., 30Forero DA, Vélez-van-Meerbeke A, Deshpande SN, Nicolini H, Perry G. Neuropsychiatric genetics in developing countries: Current challenges. World J Psychiatry 2014; 4(4): 69-71.
[http://dx.doi.org/10.5498/wjp.v4.i4.69] [PMID: 25540721]
].

LIMITATIONS

One limitation of this work is that it was not possible to control for factors that could be confounding such as stress, life adversities and other comorbidities.

LIST OF ABBREVIATIONS

BFI-S  = Big Five Inventory-Short
CISS-SF  = Coping Inventory for Stressful Situations (CISS-SF)
DD  = Depressive Disorders
MAOA  = Monoamine Oxidase A
VNTR  = Variable-Number Tandem Repeat

AUTHORS' CONTRIBUTIONS

DAF participated in study design, analysis of psychological and genetic data, drafting and critical revision of the manuscript. AA participated in analysis of psychological data and drafting and critical revision of the manuscript. SL-L participated in analysis of genetic data and drafting and critical revision of the manuscript. All authors read and approved the manuscript.

ETHICS APPROVAL AND CONSENT TO PARTICIPATE

This project was approved by the Institutional Ethics Committee of the Universidad Antonio Nariño, Colombia 07-06-2015.

HUMAN AND ANIMAL RIGHTS

No animals were used in this research. All human research procedures were followed in accordance with the ethical standards of the committee responsible for human experimentation (institutional and national), and with the Helsinki Declaration of 1975, as revised in 2013.

CONSENT FOR PUBLICATION

Written informed consent has been obtained from all the participants.

AVAILABILITY OF DATA AND MATERIAL

The data that support the findings of this study are available from the corresponding author, [D.A.F.], upon reasonable request.

FUNDING

This study was supported by a research grant from Departamento Administrativo de Ciencia, Tecnología e Innovación - Colciencias (grant # 823-2015). AA was supported by a grant from the Spanish Ministry of Economy, Industry and Competitiveness (#PSI2015-65026; MINECO/FEDER/UE).

CONFLICT OF INTEREST

The author declares no conflict of interest, financial or otherwise.

ACKNOWLEDGEMENTS

The authors thank Miss Karen Jiménez, Miss Angela Pereira and Mr. Juan Franco, for their help with DNA extraction and genotyping and application and systematization of psychological tests and results.

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