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Ugarte G, Piña R, Contreras D, Godoy F, Rubio D, Rozas C, Zeise M, Vidal R, Escobar J, Morales B. Attention Deficit-Hyperactivity Disorder (ADHD): From Abnormal Behavior to Impairment in Synaptic Plasticity. BIOLOGY 2023; 12:1241. [PMID: 37759640 PMCID: PMC10525904 DOI: 10.3390/biology12091241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 09/08/2023] [Accepted: 09/10/2023] [Indexed: 09/29/2023]
Abstract
Attention deficit-hyperactivity disorder (ADHD) is a neurodevelopmental disorder with high incidence in children and adolescents characterized by motor hyperactivity, impulsivity, and inattention. Magnetic resonance imaging (MRI) has revealed that neuroanatomical abnormalities such as the volume reduction in the neocortex and hippocampus are shared by several neuropsychiatric diseases such as schizophrenia, autism spectrum disorder and ADHD. Furthermore, the abnormal development and postnatal pruning of dendritic spines of neocortical neurons in schizophrenia, autism spectrum disorder and intellectual disability are well documented. Dendritic spines are dynamic structures exhibiting Hebbian and homeostatic plasticity that triggers intracellular cascades involving glutamate receptors, calcium influx and remodeling of the F-actin network. The long-term potentiation (LTP)-induced insertion of postsynaptic glutamate receptors is associated with the enlargement of spine heads and long-term depression (LTD) with spine shrinkage. Using a murine model of ADHD, a delay in dendritic spines' maturation in CA1 hippocampal neurons correlated with impaired working memory and hippocampal LTP has recently reported. The aim of this review is to summarize recent evidence that has emerged from studies focused on the neuroanatomical and genetic features found in ADHD patients as well as reports from animal models describing the molecular structure and remodeling of dendritic spines.
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Affiliation(s)
- Gonzalo Ugarte
- Laboratory of Neuroscience, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile, Santiago 9170022, Chile; (G.U.); (D.C.); (F.G.); (D.R.); (C.R.)
| | - Ricardo Piña
- Department of Biology, Faculty of Sciences, Metropolitan University of Education Sciences, Santiago 7760197, Chile;
- Department of Human Sciences, Faculty of Human Science, Bernardo O’Higgins University, Santiago 8370854, Chile
| | - Darwin Contreras
- Laboratory of Neuroscience, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile, Santiago 9170022, Chile; (G.U.); (D.C.); (F.G.); (D.R.); (C.R.)
| | - Felipe Godoy
- Laboratory of Neuroscience, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile, Santiago 9170022, Chile; (G.U.); (D.C.); (F.G.); (D.R.); (C.R.)
| | - David Rubio
- Laboratory of Neuroscience, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile, Santiago 9170022, Chile; (G.U.); (D.C.); (F.G.); (D.R.); (C.R.)
| | - Carlos Rozas
- Laboratory of Neuroscience, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile, Santiago 9170022, Chile; (G.U.); (D.C.); (F.G.); (D.R.); (C.R.)
| | - Marc Zeise
- School of Psychology, Faculty of Humanities, University of Santiago of Chile, Santiago 9170022, Chile;
| | - Rodrigo Vidal
- Laboratory of Genomics, Molecular Ecology and Evolutionary Studies, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile, Santiago 9170022, Chile;
| | - Jorge Escobar
- Institute of Chemistry, Pontifical Catholic University of Valparaíso, Valparaíso 2340000, Chile
| | - Bernardo Morales
- Laboratory of Neuroscience, Department of Biology, Faculty of Chemistry and Biology, University of Santiago of Chile, Santiago 9170022, Chile; (G.U.); (D.C.); (F.G.); (D.R.); (C.R.)
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Chaumette B, Grizenko N, Fageera W, Fortier MÈ, Ter-Stepanian M, Labbe A, Joober R. Correlation of the methylomic signature of smoking during pregnancy with clinical traits in ADHD. J Psychiatry Neurosci 2023; 48:E390-E399. [PMID: 37857414 PMCID: PMC10599658 DOI: 10.1503/jpn.230062] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 06/27/2023] [Accepted: 08/11/2023] [Indexed: 10/21/2023] Open
Abstract
BACKGROUND Attention deficit/hyperactivity disorder (ADHD) is a highly prevalent childhood disorder. Maternal smoking during pregnancy is a replicated environmental risk factor for this disorder. It is also a robust modifier of gene methylation during the prenatal developmental period. In this study, we sought to identify loci differentially methylated by maternal smoking during pregnancy and relate their methylation levels to various behavioural and physical outcomes relevant to ADHD. METHODS We extracted DNA from blood samples from children diagnosed with ADHD and deeply phenotyped. Genome-wide DNA methylation was assessed using Infinium MethylationEPIC BeadChip. Maternal smoking during pregnancy was self-declared and assessed retrospectively. RESULTS Our sample included 231 children with ADHD. Statistically significant differences in DNA methylation between children exposed or not to maternal smoking during pregnancy were detected in 3457 CpGs. We kept 30 CpGs with at least 5% of methylation difference between the 2 groups for further analysis. Six genes were associated with varied phenotypes of clinical relevance to ADHD. The levels of DNA methylation in RUNX1 were positively correlated with the CBCL scores, and DNA methylation in MYO1G correlated positively with the score at the Conners rating scale. Methylation level in a CpG located in GFI1 correlated with birthweight, a risk factor for ADHD. Differentially methylated regions were also identified and confirmed the association of RUNX1 methylation levels with the CBCL score. LIMITATIONS The study has several limitations, including the retrospective recall with self-report of maternal smoking during pregnancy as well as the grouping of individuals of varying age and developmental stage and of both males and females. In addition, the correlation design prevents the building of causation models. CONCLUSION This study provides evidence for the association between the level of methylation at specific loci and quantitative dimensions highly relevant for ADHD as well as birth weight, a measure that has already been associated with increased risk for ADHD. Our results provide further support to public health educational initiatives to stop maternal smoking during pregnancy.
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Affiliation(s)
- Boris Chaumette
- From the Douglas Mental Health University Institute, Montréal, Que. (Chaumette, Grizenko, Fageerat, Fortier, Ter-Stepanian, Joober); the Department of Psychiatry, McGill University, Montréal, Que. (Chaumette, Grizenko, Joober); The Neuro, McGill University, Montréal, Que. (Chaumette); the Université Paris Cité, INSERM U1266, Institute of Psychiatry and Neuroscience of Paris, Paris, France (Chaumette); the GHU Paris Psychiatrie & Neurosciences, Paris, France (Chaumette); the Department of Human Genetics, McGill University, Montréal, Que. (Fageera, Joober); the Department of Educational and Counselling Psychology, McGill University, Montréal, Que. (Ter-Stepanian); the Département de Psychoéducation, Université de Sherbrooke, Que. (Ter-Stepanian); the Department of Decision Sciences, HEC Montreal, Montréal, Que. (Labbe); the Department of Neurology and Neurosurgery, McGill University, Montréal, Que. (Joober)
| | - Natalie Grizenko
- From the Douglas Mental Health University Institute, Montréal, Que. (Chaumette, Grizenko, Fageerat, Fortier, Ter-Stepanian, Joober); the Department of Psychiatry, McGill University, Montréal, Que. (Chaumette, Grizenko, Joober); The Neuro, McGill University, Montréal, Que. (Chaumette); the Université Paris Cité, INSERM U1266, Institute of Psychiatry and Neuroscience of Paris, Paris, France (Chaumette); the GHU Paris Psychiatrie & Neurosciences, Paris, France (Chaumette); the Department of Human Genetics, McGill University, Montréal, Que. (Fageera, Joober); the Department of Educational and Counselling Psychology, McGill University, Montréal, Que. (Ter-Stepanian); the Département de Psychoéducation, Université de Sherbrooke, Que. (Ter-Stepanian); the Department of Decision Sciences, HEC Montreal, Montréal, Que. (Labbe); the Department of Neurology and Neurosurgery, McGill University, Montréal, Que. (Joober)
| | - Weam Fageera
- From the Douglas Mental Health University Institute, Montréal, Que. (Chaumette, Grizenko, Fageerat, Fortier, Ter-Stepanian, Joober); the Department of Psychiatry, McGill University, Montréal, Que. (Chaumette, Grizenko, Joober); The Neuro, McGill University, Montréal, Que. (Chaumette); the Université Paris Cité, INSERM U1266, Institute of Psychiatry and Neuroscience of Paris, Paris, France (Chaumette); the GHU Paris Psychiatrie & Neurosciences, Paris, France (Chaumette); the Department of Human Genetics, McGill University, Montréal, Que. (Fageera, Joober); the Department of Educational and Counselling Psychology, McGill University, Montréal, Que. (Ter-Stepanian); the Département de Psychoéducation, Université de Sherbrooke, Que. (Ter-Stepanian); the Department of Decision Sciences, HEC Montreal, Montréal, Que. (Labbe); the Department of Neurology and Neurosurgery, McGill University, Montréal, Que. (Joober)
| | - Marie-Ève Fortier
- From the Douglas Mental Health University Institute, Montréal, Que. (Chaumette, Grizenko, Fageerat, Fortier, Ter-Stepanian, Joober); the Department of Psychiatry, McGill University, Montréal, Que. (Chaumette, Grizenko, Joober); The Neuro, McGill University, Montréal, Que. (Chaumette); the Université Paris Cité, INSERM U1266, Institute of Psychiatry and Neuroscience of Paris, Paris, France (Chaumette); the GHU Paris Psychiatrie & Neurosciences, Paris, France (Chaumette); the Department of Human Genetics, McGill University, Montréal, Que. (Fageera, Joober); the Department of Educational and Counselling Psychology, McGill University, Montréal, Que. (Ter-Stepanian); the Département de Psychoéducation, Université de Sherbrooke, Que. (Ter-Stepanian); the Department of Decision Sciences, HEC Montreal, Montréal, Que. (Labbe); the Department of Neurology and Neurosurgery, McGill University, Montréal, Que. (Joober)
| | - Marina Ter-Stepanian
- From the Douglas Mental Health University Institute, Montréal, Que. (Chaumette, Grizenko, Fageerat, Fortier, Ter-Stepanian, Joober); the Department of Psychiatry, McGill University, Montréal, Que. (Chaumette, Grizenko, Joober); The Neuro, McGill University, Montréal, Que. (Chaumette); the Université Paris Cité, INSERM U1266, Institute of Psychiatry and Neuroscience of Paris, Paris, France (Chaumette); the GHU Paris Psychiatrie & Neurosciences, Paris, France (Chaumette); the Department of Human Genetics, McGill University, Montréal, Que. (Fageera, Joober); the Department of Educational and Counselling Psychology, McGill University, Montréal, Que. (Ter-Stepanian); the Département de Psychoéducation, Université de Sherbrooke, Que. (Ter-Stepanian); the Department of Decision Sciences, HEC Montreal, Montréal, Que. (Labbe); the Department of Neurology and Neurosurgery, McGill University, Montréal, Que. (Joober)
| | - Aurelie Labbe
- From the Douglas Mental Health University Institute, Montréal, Que. (Chaumette, Grizenko, Fageerat, Fortier, Ter-Stepanian, Joober); the Department of Psychiatry, McGill University, Montréal, Que. (Chaumette, Grizenko, Joober); The Neuro, McGill University, Montréal, Que. (Chaumette); the Université Paris Cité, INSERM U1266, Institute of Psychiatry and Neuroscience of Paris, Paris, France (Chaumette); the GHU Paris Psychiatrie & Neurosciences, Paris, France (Chaumette); the Department of Human Genetics, McGill University, Montréal, Que. (Fageera, Joober); the Department of Educational and Counselling Psychology, McGill University, Montréal, Que. (Ter-Stepanian); the Département de Psychoéducation, Université de Sherbrooke, Que. (Ter-Stepanian); the Department of Decision Sciences, HEC Montreal, Montréal, Que. (Labbe); the Department of Neurology and Neurosurgery, McGill University, Montréal, Que. (Joober)
| | - Ridha Joober
- From the Douglas Mental Health University Institute, Montréal, Que. (Chaumette, Grizenko, Fageerat, Fortier, Ter-Stepanian, Joober); the Department of Psychiatry, McGill University, Montréal, Que. (Chaumette, Grizenko, Joober); The Neuro, McGill University, Montréal, Que. (Chaumette); the Université Paris Cité, INSERM U1266, Institute of Psychiatry and Neuroscience of Paris, Paris, France (Chaumette); the GHU Paris Psychiatrie & Neurosciences, Paris, France (Chaumette); the Department of Human Genetics, McGill University, Montréal, Que. (Fageera, Joober); the Department of Educational and Counselling Psychology, McGill University, Montréal, Que. (Ter-Stepanian); the Département de Psychoéducation, Université de Sherbrooke, Que. (Ter-Stepanian); the Department of Decision Sciences, HEC Montreal, Montréal, Que. (Labbe); the Department of Neurology and Neurosurgery, McGill University, Montréal, Que. (Joober)
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Di Paola V, Morrone M, Poli V, Fuso A, Pascale E, Adriani W. How Can CpG Methylations, and Pair-to-Pair Correlations between the Main (Gene) and the Opposite Strands, Suggest a Bending DNA Loop: Insights into the 5'-UTR of DAT1. Genes (Basel) 2023; 14:190. [PMID: 36672931 PMCID: PMC9859484 DOI: 10.3390/genes14010190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 12/22/2022] [Accepted: 01/04/2023] [Indexed: 01/13/2023] Open
Abstract
A working hypothesis issues from patterns of methylation in the 5'-UTR of the DAT1 gene. We considered relationships between pairs of CpGs, of which one on the main-gene strand and another on the complementary opposite strand (COS). We elaborated on data from ADHD children: we calculated all possible combinations of probabilities (estimated by multiplying two raw values of methylation) in pairs of CpGs from either strand. We analyzed all correlations between any given pair and all other pairs. For pairs correlating with M6-M6COS, some pairs had cytosines positioning to the reciprocal right (e.g., M3-M2COS and M6-M5COS), other pairs had cytosines positioning to the reciprocal left (e.g., M2-M3COS; M5-M6COS). Significant pair-to-pair correlations emerged between main-strand and COS CpG pairs. Through graphic representations, we hypothesized that DNA folded to looping conformations: the C1GG C2GG C3GG and C5G C6G motifs would become close enough to allow cytosines 1-2-3 to interact with cytosines 5-6 (on both strands). Data further suggest a sliding, with left- and right-ward oscillations of DNA strands. While thorough empirical verification is needed, we hypothesize simultaneous methylation of main-strand and COS DNA ("methylation dynamics") to serve as a promising biomarker.
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Affiliation(s)
| | - Martina Morrone
- Faculty of Psychology, Uninettuno University, 00186 Rome, Italy
| | - Valentina Poli
- Faculty of Psychology, Uninettuno University, 00186 Rome, Italy
| | - Andrea Fuso
- Department of Experimental Medicine, “Sapienza” University of Rome, 00161 Rome, Italy
| | - Esterina Pascale
- Department of Medical-Surgical Sciences and of Biotechnologies, “Sapienza” University of Rome, 00161 Rome, Italy
| | - Walter Adriani
- Faculty of Psychology, Uninettuno University, 00186 Rome, Italy
- Center for Behavioral Sciences and Mental Health, Istituto Superiore di Sanità, 00161 Rome, Italy
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Véronneau-Veilleux F, Robaey P, Ursino M, Nekka F. A mechanistic model of ADHD as resulting from dopamine phasic/tonic imbalance during reinforcement learning. Front Comput Neurosci 2022; 16:849323. [PMID: 35923915 PMCID: PMC9342605 DOI: 10.3389/fncom.2022.849323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 06/28/2022] [Indexed: 11/25/2022] Open
Abstract
Attention deficit hyperactivity disorder (ADHD) is the most common neurodevelopmental disorder in children. Although the involvement of dopamine in this disorder seems to be established, the nature of dopaminergic dysfunction remains controversial. The purpose of this study was to test whether the key response characteristics of ADHD could be simulated by a mechanistic model that combines a decrease in tonic dopaminergic activity with an increase in phasic responses in cortical-striatal loops during learning reinforcement. To this end, we combined a dynamic model of dopamine with a neurocomputational model of the basal ganglia with multiple action channels. We also included a dynamic model of tonic and phasic dopamine release and control, and a learning procedure driven by tonic and phasic dopamine levels. In the model, the dopamine imbalance is the result of impaired presynaptic regulation of dopamine at the terminal level. Using this model, virtual individuals from a dopamine imbalance group and a control group were trained to associate four stimuli with four actions with fully informative reinforcement feedback. In a second phase, they were tested without feedback. Subjects in the dopamine imbalance group showed poorer performance with more variable reaction times due to the presence of fast and very slow responses, difficulty in choosing between stimuli even when they were of high intensity, and greater sensitivity to noise. Learning history was also significantly more variable in the dopamine imbalance group, explaining 75% of the variability in reaction time using quadratic regression. The response profile of the virtual subjects varied as a function of the learning history variability index to produce increasingly severe impairment, beginning with an increase in response variability alone, then accumulating a decrease in performance and finally a learning deficit. Although ADHD is certainly a heterogeneous disorder, these results suggest that typical features of ADHD can be explained by a phasic/tonic imbalance in dopaminergic activity alone.
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Affiliation(s)
- Florence Véronneau-Veilleux
- Faculté de Pharmacie, Université de Montréal, Montreal, QC, Canada
- *Correspondence: Florence Véronneau-Veilleux
| | - Philippe Robaey
- Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, ON, Canada
| | - Mauro Ursino
- Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi,” University of Bologna, Bologna, Italy
| | - Fahima Nekka
- Faculté de Pharmacie, Université de Montréal, Montreal, QC, Canada
- Centre de Recherches Mathématiques, Université de Montréal, Montreal, QC, Canada
- Centre for Applied Mathematics in Bioscience and Medicine, McGill University, Montreal, QC, Canada
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Chmielowiec J, Chmielowiec K, Strońska-Pluta A, Suchanecka A, Humińska-Lisowska K, Lachowicz M, Niewczas M, Białecka M, Śmiarowska M, Grzywacz A. Methylation in the Promoter Region of the Dopamine Transporter DAT1 Gene in People Addicted to Nicotine. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19148602. [PMID: 35886451 PMCID: PMC9321476 DOI: 10.3390/ijerph19148602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 06/30/2022] [Accepted: 07/12/2022] [Indexed: 01/27/2023]
Abstract
The dopaminergic system is a crucial element of the addiction processes. The dopamine transporter modulates the dynamics and levels of released dopamine in the synaptic cleft. Therefore, regulation of dopamine transporter (DAT1) gene expression is critical for maintaining homeostasis in the dopaminergic system. The aim of our study is evaluation of the methylation status of 33 CpG islands located in the DAT1 gene promoter region related to nicotine dependency. We investigated 142 nicotine-dependent subjects and 238 controls. Our results show that as many as 14 of the 33 CpG islands tested had statistically significantly higher methylation in the nicotine-dependent group compared to the control group. After applying Bonferroni correction, the total number of methylation sites was also significantly higher in the dependent subjects group. The analysis of the methylation status of particular CpG sites revealed a new direction of research regarding the biological aspects of nicotine addiction.
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Affiliation(s)
- Jolanta Chmielowiec
- Department of Hygiene and Epidemiology, Collegium Medicum, University of Zielona Góra, 65-046 Zielona Gora, Poland; (J.C.); (K.C.)
| | - Krzysztof Chmielowiec
- Department of Hygiene and Epidemiology, Collegium Medicum, University of Zielona Góra, 65-046 Zielona Gora, Poland; (J.C.); (K.C.)
| | - Aleksandra Strońska-Pluta
- Independent Laboratory of Health Promotion, Pomeranian Medical University in Szczecin, 70-204 Szczecin, Poland; (A.S.-P.); (A.S.)
| | - Aleksandra Suchanecka
- Independent Laboratory of Health Promotion, Pomeranian Medical University in Szczecin, 70-204 Szczecin, Poland; (A.S.-P.); (A.S.)
| | - Kinga Humińska-Lisowska
- Faculty of Physical Education, Gdansk University of Physical Education and Sport, 80-336 Gdansk, Poland;
| | - Milena Lachowicz
- Department of Psychology, Gdansk University of Physical Education and Sport, 80-336 Gdansk, Poland;
| | - Marta Niewczas
- Faculty of Physical Education, University of Rzeszow, 35-959 Rzeszow, Poland;
| | - Monika Białecka
- Department of Pharmacokinetics and Therapeutic Drug Monitoring, Pomeranian Medical University, 70-111 Szczecin, Poland; (M.B.); (M.Ś.)
| | - Małgorzata Śmiarowska
- Department of Pharmacokinetics and Therapeutic Drug Monitoring, Pomeranian Medical University, 70-111 Szczecin, Poland; (M.B.); (M.Ś.)
| | - Anna Grzywacz
- Independent Laboratory of Health Promotion, Pomeranian Medical University in Szczecin, 70-204 Szczecin, Poland; (A.S.-P.); (A.S.)
- Correspondence: ; Tel.: +48-91441-47-46
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Marzilli E, Cerniglia L, Tambelli R, Cimino S. Children’s ADHD and Dysregulation Problems, DAT1 Genotype and Methylation, and their Interplay with Family Environment. CHILD & YOUTH CARE FORUM 2022. [DOI: 10.1007/s10566-022-09687-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Abstract
Background
International literature has underlined the complex interplay between genetic and environmental variables in shaping children’s emotional-behavioral functioning.
Objective
This study aimed to explore the dynamic relationship between children’s Dopamine Transporter (DAT1) genotype and methylation, and maternal and paternal affective environment, on children’s Attention Deficit Hyperactivity Disorder (ADHD) problems and dysregulation problems.
Method
In a community sample of 76 families with school-aged children, we assessed children’s DAT1 genotype and methylation, their own ADHD problems and dysregulation profile (CBCL 6–18 DP), and maternal and paternal psychopathological risk, parenting stress, and marital adjustment. Hierarchical regressions were carried out to verify the possible moderation of children’s genotype on the relationship between children’s methylation and psychopathological risk, parental environment and children’s methylation, and parental environment and children’s psychopathological risk.
Results
The levels of methylation at M1 CpG significantly predicted ADHD problems among children with 10/10 genotype, whereas high levels of methylation at M6 CpG predicted low ADHD problems for children with 9/x genotype. High levels of methylation at M3 CpG were associated with high scores of CBCL DP. DAT1 genotype moderated the relationship between maternal and paternal variables with children’s methylation and psychopathological risk. The scores of maternal and paternal Dyadic Adjustment Scale showed indirect effects on children’s methylation and psychopathological risk in relation to those exerted by risk factors.
Conclusion
Our study has supported the emerging evidence on the complex nature of children’s emotional-behavioral functioning and the associated risk and protective factors, with important implications for the planning of preventive programs.
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Stanford SC. Animal Models of ADHD? Curr Top Behav Neurosci 2022; 57:363-393. [PMID: 35604570 DOI: 10.1007/7854_2022_342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
To describe animals that express abnormal behaviors as a model of Attention-Deficit Hyperactivity Disorder (ADHD) implies that the abnormalities are analogous to those expressed by ADHD patients. The diagnostic features of ADHD comprise inattentiveness, impulsivity, and hyperactivity and so these behaviors are fundamental for validation of any animal model of this disorder. Several experimental interventions such as neurotoxic lesion of neonatal rats with 6-hydroxydopamine (6-OHDA), genetic alterations, or selective inbreeding of rodents have produced animals that express each of these impairments to some extent. This article appraises the validity of claims that these procedures have produced a model of ADHD, which is essential if they are to be used to investigate the underlying cause(s) of ADHD and its abnormal neurobiology.
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Affiliation(s)
- S Clare Stanford
- Department of Neuroscience Physiology and Pharmacology, University College London, London, UK.
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Epigenetic regulation of DAT gene promoter modulates the risk of externalizing and internalizing behaviors on a normative population: An explorative study. Behav Brain Res 2021; 406:113246. [PMID: 33745985 DOI: 10.1016/j.bbr.2021.113246] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 02/15/2021] [Accepted: 03/12/2021] [Indexed: 11/22/2022]
Abstract
Accumulating research addressed epigenetic modifications and their role on behavioral phenotypes. We recently proposed to study methylation dynamics of two CpG motifs within the 5'-UTR of dopamine transporter (DAT) gene. Starting from a normative population sample of young adults, we selected three sub-groups based on their prevalent symptoms: subjects were assigned to Internalizing, Externalizing and Low-risk sub-groups according to elevated scores in specific phenotypic scales. Using a new approach, we calculated three independent matrixes of cross-correlation between CpG methylation levels, one within each phenotypic sub-group, to determine in which dynamics did the sub-groups differ. We found specific cross-correlation patterns in Externalizing (CpG1, 2 and 3, opposite to the methylation at CpG6) and Internalizing individuals (CpG1 methylation opposite to CpG2, 3 and 6), while Low-risk individuals could follow both trends. The aim of our study was to look for a specific DAT methylation pattern, providing a biomarker that allows early identification of the risk for psycho-pathological deviance.
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Tafani X, Pascale E, Fattapposta F, Pucci M, D'Addario C, Adriani W. Cross-correlations between motifs in the 5'-UTR of DAT1 gene: Findings from Parkinson's disease. Adv Biol Regul 2020; 78:100753. [PMID: 33022465 DOI: 10.1016/j.jbior.2020.100753] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 08/28/2020] [Accepted: 09/07/2020] [Indexed: 06/11/2023]
Abstract
Parkinson's disease (PD) is a neuro-degenerative disorder affecting the striatal motor system, caused by the loss of neuronal cells in the mid-brain, where reduced amounts of dopamine do cause involuntary movements and others symptoms. Alterations of methylome have been reported in PD epigenomic studies, and also human dopamine transporter gene (DAT1, SLC6A3) is considered as a candidate risk factor for PD. Since the DNA methylation on DAT promoter may well have a role in the development of this disease, we aimed to further assess the epigenetic control, by focusing on specific CpG sites located in the 5'-untranslated region (5'-UTR) of the DAT1 gene. Significant changes in DAT 5'-UTR methylation were already found in peripheral blood mononuclear cells (PBMCs) of PD subjects (Rubino et al., 2020). Of note, methylation values at the CpG 5 were increased. We run on same data a novel statistical approach: cross-correlation between pairs of loci. CpG 5 was the only always-differing variable but, alternatively, CpGs 2 and 6 or CpGs 1 and 3 were also significantly correlated with CpG 5. Interestingly, this picture emerged for those patients whose M2xM6 index was above-median; loci were rather independent for below-median patients. Present data may shed light into dynamics occurring at 5'-UTR of DAT1, a gene involved in PD but also in many psycho-physiological pathologies.
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Affiliation(s)
- Xhensina Tafani
- Faculty of Psychology - UTIU Università Telematica Internazionale "Uninettuno", Rome, Italy
| | - Esterina Pascale
- Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University, Rome, Italy
| | | | - Mariangela Pucci
- Faculty of Bioscience & Technology for Food, for Agriculture and for Environment - University of Teramo, Teramo, Italy
| | - Claudio D'Addario
- Faculty of Bioscience & Technology for Food, for Agriculture and for Environment - University of Teramo, Teramo, Italy
| | - Walter Adriani
- Faculty of Psychology - UTIU Università Telematica Internazionale "Uninettuno", Rome, Italy; Reference Center for Behavioral Science and Mental Health - Istituto Superiore di Sanità, Rome, Italy.
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De Nardi L, Carpentieri V, Pascale E, Pucci M, D’Addario C, Cerniglia L, Adriani W, Cimino S. Involvement of DAT1 Gene on Internet Addiction: Cross-Correlations of Methylation Levels in 5'-UTR and 3'-UTR Genotypes, Interact with Impulsivity and Attachment-Driven Quality of Relationships. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:E7956. [PMID: 33138218 PMCID: PMC7663088 DOI: 10.3390/ijerph17217956] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/10/2020] [Accepted: 10/23/2020] [Indexed: 12/14/2022]
Abstract
Internet influences our communication, social and work interactions, entertainment, and many other aspects of life. Even if the original purpose was to simplify our lives, an excessive and/or maladaptive use of it may have negative consequences. The dopamine transporter (DAT1) gene was studied in relation to addictions, including excessive use of the Internet. The crucial role of DAT1 was previously underlined in modulating emotional aspects, such as affiliative behaviors. The present research follows a new approach based on cross-correlation between (de)methylation levels in couples of CpG loci, as previously shown. We investigated the possible relationships between Internet addiction, impulsivity, quality of attachment, DAT1 genotypes (from the 3'-untranslated region (UTR) variable number of tandem repeats (VNTR) poly-morphism), and the dynamics of methylation within the 5'-UTR of the DAT1 gene. From a normative sample of 79 youths, we extrapolated three subgroups a posteriori, i.e., one "vulnerable" with high Internet Addiction Test (IAT) scores (and high Barrat Impulsivity Scale (BIS) scores; n = 9) and two "controls'' with low BIS scores and 10/10 vs. 9/x genotype (n = 12 each). Controls also had a "secure" attachment pattern, while genotypes and attachment styles were undistinguished in the vulnerable subgroup (none showed overt Internet addiction). We found a strongly positive correlation in all groups between CpG2 and CpG3. An unsuspected relationship between the 3'-UTR genotype and a 5'-UTR intra-motif link was revealed by CpG5-CpG6 comparison. The negative correlation between the CpG3-CpG5 positions was quite significant in the control groups (both with genotype 10/10 and with genotype 9/x), whereas a tendency toward positive correlation emerged within the high IAT group. In conclusion, future attention shall be focused on the intra- and inter-motif interactions of methylation on the CpG island at the 5'-UTR of DAT1.
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Affiliation(s)
- Laura De Nardi
- Faculty of Psychology, International Telematic University Uninettuno, I-00186 Rome, Italy; (L.D.N.); (L.C.)
| | - Valentina Carpentieri
- Center for Behavioral Sciences and Mental Health, Istituto Superiore di Sanità, I-00161 Rome, Italy;
| | - Esterina Pascale
- Department of Medical-Surgical Sciences and Biotechnologies, Sapienza University of Rome, I-00161 Rome, Italy;
| | - Mariangela Pucci
- Faculty of Bioscience & Technology for Food, for Agriculture and for Environment, University of Teramo, I-64100 Teramo, Italy; (M.P.); (C.D.)
| | - Claudio D’Addario
- Faculty of Bioscience & Technology for Food, for Agriculture and for Environment, University of Teramo, I-64100 Teramo, Italy; (M.P.); (C.D.)
| | - Luca Cerniglia
- Faculty of Psychology, International Telematic University Uninettuno, I-00186 Rome, Italy; (L.D.N.); (L.C.)
| | - Walter Adriani
- Faculty of Psychology, International Telematic University Uninettuno, I-00186 Rome, Italy; (L.D.N.); (L.C.)
- Center for Behavioral Sciences and Mental Health, Istituto Superiore di Sanità, I-00161 Rome, Italy;
| | - Silvia Cimino
- Department of Dynamic and Clinical Psychology, Sapienza University of Rome, I-00186 Rome, Italy;
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Search for an epigenetic biomarker in ADHD diagnosis, based on the DAT1 gene 5'-UTR methylation: a new possible approach. Psychiatry Res 2020; 291:113154. [PMID: 32554184 DOI: 10.1016/j.psychres.2020.113154] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/20/2020] [Accepted: 05/28/2020] [Indexed: 02/01/2023]
Abstract
Attention Deficit/Hyperactivity Disorder (ADHD) is the most common neuro-developmental alteration in childhood. To date, its diagnosis is exclusively clinical, however recent studies focused on searching for objective biomarkers. We recently reported a selective alteration of DNA methylation in the 5'-UTR of dopamine transporter (DAT1) gene, in a 1CGG2CGG3CGG and a 5CG6CG motif, for ADHD patients (compared to controls). Presently, we looked for DNA methylation of the corresponding CpG sites but complementary on the opposite strand ("COS"). Exploiting a novel cross-correlation approach, we found a core M5 - M5 COS and M2 - M2 COS relationship with relatively free M1 and M6 COS extremes. Our data might be relevant, to find a new biomarker to diagnose ADHD in affected subjects.
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