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https://www.readbyqxmd.com/read/28176268/no-genetic-association-between-attention-deficit-hyperactivity-disorder-adhd-and-parkinson-s-disease-in-nine-adhd-candidate-snps
#1
Julia M Geissler, Marcel Romanos, Manfred Gerlach, Daniela Berg, Claudia Schulte
Attention-deficit/hyperactivity disorder (ADHD) and Parkinson's disease (PD) involve pathological changes in brain structures such as the basal ganglia, which are essential for the control of motor and cognitive behavior and impulsivity. The cause of ADHD and PD remains unknown, but there is increasing evidence that both seem to result from a complicated interplay of genetic and environmental factors affecting numerous cellular processes and brain regions. To explore the possibility of common genetic pathways within the respective pathophysiologies, nine ADHD candidate single nucleotide polymorphisms (SNPs) in seven genes were tested for association with PD in 5333 cases and 12,019 healthy controls: one variant, respectively, in the genes coding for synaptosomal-associated protein 25 k (SNAP25), the dopamine (DA) transporter (SLC6A3; DAT1), DA receptor D4 (DRD4), serotonin receptor 1B (HTR1B), tryptophan hydroxylase 2 (TPH2), the norepinephrine transporter SLC6A2 and three SNPs in cadherin 13 (CDH13)...
February 7, 2017: Attention Deficit and Hyperactivity Disorders
https://www.readbyqxmd.com/read/28163252/the-legacy-pesticide-dieldrin-acts-as-a-teratogen-and-alters-the-expression-of-dopamine-transporter-and-dopamine-receptor-2a-in-zebrafish-danio-rerio-embryos
#2
Kathleena I Sarty, Andrew Cowie, Christopher J Martyniuk
Dieldrin (DLD) is a lipophilic pesticide that shows environmental persistence. The objectives were to determine the effects of DLD on GABAergic and dopaminergic systems in developing zebrafish. Both chorionated and dechorionated embryos (~24h post-hatch) were exposed to a single concentration of DLD (0.347-3470μM) for 48h. Following exposure, a subset of larvae was placed into clean water for 6days (i.e. depuration phase). Chorionated embryos showed <15% mortality while dechorionated embryos showed higher mortality (>30%), suggesting that the chorion protected the embryos...
February 3, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28154545/influence-of-the-slc6a3-dat1-gene-on-multifaceted-measures-of-self-regulation-in-preschool-children
#3
Lina M Cómbita, Pascale Voelker, Alicia Abundis-Gutiérrez, Joan P Pozuelos, M Rosario Rueda
Development of self-regulation, the capacity to voluntarily modulate thoughts, emotions and actions is strongly related to the maturation of the dopamine-mediated executive attention network (EAN). The attention control processes associated with the EAN greatly overlap with efficiency of the executive functions and are correlated with measures of effortful control. Regulation of dopamine levels within the EAN, particularly in the basal ganglia is carried out by the action of dopamine transporters. In humans, the SLC6A3/DAT1 gene carries out the synthesis of the DAT protein...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28055236/characterization-of-vntrs-within-the-entire-region-of-slc6a3-and-its-association-with-hypertension
#4
Won-Tae Kim, Se-Ra Lee, Yun-Gil Roh, Seung Il Kim, Yung Hyun Choi, Mi-Hye Mun, Mi-So Jeong, Sang Seok Koh, Sun-Hee Leem
The dopamine transporter SLC6A3 (DAT1) mediates uptake of dopamine into presynaptic terminals. In addition, in previous reports, hypertensive rats were associated with DAT gene, but the genetic association with SLC6A3 and hypertension is still unknown. We examined the distribution of variable number of tandem repeats (VNTRs) and conducted polymorphic analysis of the entire region of SLC6A3. Ten VNTR regions (MS1-10) were revealed throughout the intronic and UTRs; seven VNTR regions were newly isolated and three VNTRs were previously reported...
January 5, 2017: DNA and Cell Biology
https://www.readbyqxmd.com/read/27886638/preliminary-evidence-that-negative-symptom-severity-relates-to-multilocus-genetic-profile-for-dopamine-signaling-capacity-and-d2-receptor-binding-in-healthy-controls-and-in-schizophrenia
#5
Sarah A Eisenstein, Ryan Bogdan, Ling Chen, Stephen M Moerlein, Kevin J Black, Joel S Perlmutter, Tamara Hershey, Deanna M Barch
Deficits in central, subcortical dopamine (DA) signaling may underlie negative symptom severity, particularly anhedonia, in healthy individuals and in schizophrenia. To investigate these relationships, we assessed negative symptoms with the Schedule for the Assessment of Negative Symptoms and the Brief Negative Symptom Scale (BNSS) and self-reported anhedonia with the Scales for Physical and Social Anhedonia (SPSA), Temporal Experience of Pleasure Scale, and Snaith-Hamilton Pleasure Scale in 36 healthy controls (HC), 27 siblings (SIB) of individuals with schizophrenia, and 66 individuals with schizophrenia or schizoaffective disorder (SCZ)...
March 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/27873141/the-contribution-of-maternal-adhd-symptomatology-maternal-dat1-and-home-atmosphere-to-child-adhd-symptomatology-at-7%C3%A2-years-of-age
#6
Judith G Auerbach, Yael Zilberman-Hayun, Naama Atzaba-Poria, Andrea Berger
Children of mothers with attention-deficit/hyperactivity disorder (ADHD) have an increased genetic and environmental risk for ADHD. The unique and interactive contributions of a maternal dopamine receptor gene (DAT1), maternal ADHD symptoms (hyperactive- impulsive, inattentive), and home atmosphere to the prediction of ADHD symptoms (hyperactive- impulsive, inattentive) in 7- year-old boys (N = 96) were examined using data from a longitudinal study of familial risk for ADHD. During the first 6 months of the study, mothers and their spouses completed a questionnaire about the mother's ADHD symptoms...
November 21, 2016: Journal of Abnormal Child Psychology
https://www.readbyqxmd.com/read/27799900/vntr-dat1-and-comtval158met-genotypes-modulate-mental-flexibility-and-adaptive-behavior-skills-in-down-syndrome
#7
Laura Del Hoyo, Laura Xicota, Klaus Langohr, Gonzalo Sánchez-Benavides, Susana de Sola, Aida Cuenca-Royo, Joan Rodriguez, Jose Rodríguez-Morató, Magí Farré, Mara Dierssen, Rafael de la Torre
Down syndrome (DS) is an aneuploidy syndrome that is caused by trisomy for human chromosome 21 resulting in a characteristic cognitive and behavioral phenotype, which includes executive functioning and adaptive behavior difficulties possibly due to prefrontal cortex (PFC) deficits. DS also present a high risk for early onset of Alzheimer Disease-like dementia. The dopamine (DA) system plays a neuromodulatory role in the activity of the PFC. Several studies have implicated trait differences in DA signaling on executive functioning based on genetic polymorphisms in the genes encoding for the catechol-O-methyltransferase (COMTVal158Met) and the dopamine transporter (VNTR-DAT1)...
2016: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/27786532/relations-between-three-dopaminergic-system-genes-school-attachment-and-adolescent-delinquency
#8
Adam Fine, Alissa Mahler, Cortney Simmons, Chuansheng Chen, Robert Moyzis, Elizabeth Cauffman
Both environmental factors and genetic variation, particularly in genes responsible for the dopaminergic system such as DRD4, DRD2, and DAT1 (SLC6A3), affect adolescent delinquency. The school context, despite its developmental importance, has been overlooked in gene-environment research. Using data from the National Institute of Child Health and Human Development Study of Early Child Care and Youth Development (NICHD ECCYD), this study examined key interactions between school attachment and (a) each of the DRD4, DRD2, and DAT1 (SLC6A3) genotypes; and (b) a polygenic score...
November 2016: Developmental Psychology
https://www.readbyqxmd.com/read/27752828/erratum-to-further-evidence-for-the-association-between-a-polymorphism-in-the-promoter-region-of-slc6a3-dat1-and-adhd-findings-from-a-sample-of-adults
#9
Lucas A de Azeredo, Diego L Rovaris, Nina R Mota, Evelise R Polina, Francine Z Marques, Verônica Contini, Eduardo S Vitola, Paulo Belmonte-de-Abreu, Luis A Rohde, Eugenio H Grevet, Claiton H D Bau
No abstract text is available yet for this article.
December 2016: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/27676100/dat1-methylation-is-associated-with-methylphenidate-response-on-oppositional-and-hyperactive-impulsive-symptoms-in-children-and-adolescents-with-adhd
#10
Kaijing Ding, Jianzhong Yang, Gavin P Reynolds, Bing Chen, Jingru Shao, Ruixiang Liu, Qiujin Qian, Hua Liu, Runxu Yang, Jianfan Wen, Chuanyuan Kang
OBJECTIVES: To examine the association of the DNA methylation of DAT1 and DRD4 gene with methylphenidate (MPH) response in attention deficit hyperactivity disorder (ADHD). METHODS: One hundred and eleven DSM-IV defined ADHD Chinese Han children were recruited. Inattention, hyperactivity-impulsivity and oppositional symptoms were evaluated by the Swanson, Nolan and Pelham-IV-parent rating scale (SNAP-IV-P) at baseline and 6 weeks after MPH treatment. DNA methylation of CpG sites in the promoter sequences of DAT1 and DRD4 was examined for association with treatment response...
September 27, 2016: World Journal of Biological Psychiatry
https://www.readbyqxmd.com/read/27663943/age-and-drd4-genotype-moderate-associations-between-stimulant-treatment-history-and-cortex-structure-in-attention-deficit-hyperactivity-disorder
#11
Lizanne J S Schweren, Catharina A Hartman, Dirk J Heslenfeld, Annabeth P Groenman, Barbara Franke, Jaap Oosterlaan, Jan K Buitelaar, Pieter J Hoekstra
OBJECTIVE: Attention-deficit/hyperactivity disorder (ADHD) has been associated with dopaminergic imbalance and subtle volume decreases in the brain. Stimulants acutely enhance dopaminergic neurotransmission. Long-term effects of prolonged manipulation of the dopaminergic system on brain structure remain poorly understood; they could be beneficial or unfavorable and could be moderated by common genetic variants and/or age. METHOD: In a large observational ADHD cohort study (N = 316), the effects of cumulative stimulant treatment, genotype (for DAT1 haplotype and DRD4 variants), and treatment-by-genotype interactions on striatal, frontal, and hippocampal volumes and their interactions with age were evaluated...
October 2016: Journal of the American Academy of Child and Adolescent Psychiatry
https://www.readbyqxmd.com/read/27629597/genetic-moderation-of-intervention-efficacy-dopaminergic-genes-the%C3%A2-incredible-years-and-externalizing-behavior-in-children
#12
Rabia R Chhangur, Joyce Weeland, Geertjan Overbeek, Walter Matthys, Bram Orobio de Castro, Danielle van der Giessen, Jay Belsky
This study investigated whether children scoring higher on a polygenic plasticity index based on five dopaminergic genes (DRD4, DRD2, DAT1, MAOA, and COMT) benefited the most from the Incredible Years (IY) parent program. Data were used from a randomized controlled trial including 341 Dutch families with 4- to 8-year-old children (55.7% boys) showing moderate to high levels of problem behavior. IY proved to be most effective in decreasing parent-reported (but not observed) externalizing behavior in boys (but not girls) carrying more rather than fewer dopaminergic plasticity alleles; this Gene × Intervention effect was most pronounced in the case of boys whose parents' manifested the most positive change in parenting in response to the intervention...
September 15, 2016: Child Development
https://www.readbyqxmd.com/read/27444553/a-test-replicate-approach-to-candidate-gene-research-on-addiction-and-externalizing-disorders-a-collaboration-across-five-longitudinal-studies
#13
Diana R Samek, Jennifer Bailey, Karl G Hill, Sylia Wilson, Susanne Lee, Margaret A Keyes, Marina Epstein, Andrew Smolen, Michael Miller, Ken C Winters, J David Hawkins, Richard F Catalano, William G Iacono, Matt McGue
This study presents results from a collaboration across five longitudinal studies seeking to test and replicate models of gene-environment interplay in the development of substance use and externalizing disorders (SUDs, EXT). We describe an overview of our conceptual models, plan for gene-environment interplay analyses, and present main effects results evaluating six candidate genes potentially relevant to SUDs and EXT (MAOA, 5-HTTLPR, COMT, DRD2, DAT1, and DRD4). All samples included rich longitudinal and phenotypic measurements from childhood/adolescence (ages 5-13) through early adulthood (ages 25-33); sample sizes ranged from 3487 in the test sample, to ~600-1000 in the replication samples...
September 2016: Behavior Genetics
https://www.readbyqxmd.com/read/27384573/sugar-sweetened-beverage-consumption-is-adversely-associated-with-childhood-attention-deficit-hyperactivity-disorder
#14
Ching-Jung Yu, Jung-Chieh Du, Hsien-Chih Chiou, Chun-Cheng Feng, Ming-Yi Chung, Winnie Yang, Ying-Sheue Chen, Ling-Chu Chien, Betau Hwang, Mei-Lien Chen
Attention deficit/hyperactivity disorder (ADHD) is one of the most common childhood neurobehavioral conditions. Evidence of the negative effects of sugar-sweetened beverages (SSBs) on mental health has not been convincing, although a few studies have found an association between high SSB levels and attention problems in children. This study aimed to test the hypothesis that SSB consumption is associated with ADHD among children. Doctor-diagnosed ADHD cases (n = 173) and non-ADHD controls (n = 159) between age 4 to 15 were recruited...
2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27333929/genetical-background-of-intelligence
#15
Anna Junkiert-Czarnecka, Olga Haus
Intelligence as an ability to reason, think abstractly and adapt effectively to the environment is a subject of research in the field of psychology, neurobiology, and in the last twenty years genetics as well. Genetical testing of twins carried out from XX century indicated heritebility of intelligence, therefore confirmed an influence of genetic factor on cognitive processes. Studies on genetic background of intelligence focus on dopaminergic (DRD2, DRD4, COMT, SLC6A3, DAT1, CCKAR) and adrenergic system (ADRB2, CHRM2) genes as well as, neutrofins (BDNF) and oxidative stress genes (LTF, PRNP)...
June 13, 2016: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/27327562/comt-and-dat1-genes-are-associated-with-hyperactivity-and-inattention-traits-in-the-1993-pelotas-birth-cohort-evidence-of-sex-specific-combined-effect
#16
Glaucia C Akutagava-Martins, Angelica Salatino-Oliveira, Christian Kieling, Julia P Genro, Guilherme V Polanczyk, Luciana Anselmi, Ana M B Menezes, Helen Gonçalves, Fernando C Wehrmeister, Fernando C Barros, Sidia M Callegari-Jacques, Luis A Rohde, Mara H Hutz
BACKGROUND: Attention-deficit/hyperactivity disorder (ADHD) symptoms are dimensionally distributed in the population. This study aimed to assess the role of the catechol-O-methyltransferase (COMT) and of the dopamine transporter (DAT1) genes on ADHD symptoms in the general population. METHODS: We investigated 4101 individuals from the 1993 Pelotas Birth Cohort Study using the parent version of the Strengths and Difficulties Questionnaire (SDQ) at ages 11 and 15 years...
October 2016: Journal of Psychiatry & Neuroscience: JPN
https://www.readbyqxmd.com/read/27268567/teacher-student-relationships-and-adolescent-behavioral-engagement-and-rule-breaking-behavior-the-moderating-role-of-dopaminergic-genes
#17
Steven De Laet, Hilde Colpin, Karla Van Leeuwen, Wim Van den Noortgate, Stephan Claes, Annelies Janssens, Luc Goossens, Karine Verschueren
This study examined whether the dopamine transporter DAT1 and the dopamine receptor DRD4 genes moderate the effect of student-reported teacher-student relationship affiliation or dissatisfaction on parent-reported adolescent rule-breaking behavior and behavioral engagement. The sample included 1053 adolescents (51% boys, Mage=13.79) from grades 7 to 9. Regression analyses were conducted using Mplus while controlling for multiple testing and nested data. Adolescents who experienced stronger affiliation with their teachers were more engaged in school, whereas greater dissatisfaction predicted more rule-breaking behavior...
June 2016: Journal of School Psychology
https://www.readbyqxmd.com/read/27218681/developmentally-sensitive-interaction-effects-of-genes-and-the-social-environment-on-total-and-subcortical-brain-volumes
#18
Jennifer S Richards, Alejandro Arias Vásquez, Barbara Franke, Pieter J Hoekstra, Dirk J Heslenfeld, Jaap Oosterlaan, Stephen V Faraone, Jan K Buitelaar, Catharina A Hartman
Smaller total brain and subcortical volumes have been linked to psychopathology including attention-deficit/hyperactivity disorder (ADHD). Identifying mechanisms underlying these alterations, therefore, is of great importance. We investigated the role of gene-environment interactions (GxE) in interindividual variability of total gray matter (GM), caudate, and putamen volumes. Brain volumes were derived from structural magnetic resonance imaging scans in participants with (N = 312) and without ADHD (N = 437) from N = 402 families (age M = 17...
2016: PloS One
https://www.readbyqxmd.com/read/27170266/testing-differential-susceptibility-plasticity-genes-the-social-environment-and-their-interplay-in-adolescent-response-inhibition
#19
Jennifer S Richards, Alejandro Arias Vásquez, Daan van Rooij, Dennis van der Meer, Barbara Franke, Pieter J Hoekstra, Dirk J Heslenfeld, Jaap Oosterlaan, Stephen V Faraone, Catharina A Hartman, Jan K Buitelaar
OBJECTIVES: Impaired inhibitory control is a key feature of attention-deficit/hyperactivity disorder (ADHD). We investigated gene-environment interaction (GxE) as a possible contributing factor to response inhibition variation in context of the differential susceptibility theory. This states individuals carrying plasticity gene variants will be more disadvantaged in negative, but more advantaged in positive environments. METHODS: Behavioural and neural measures of response inhibition were assessed during a Stop-signal task in participants with (N = 197) and without (N = 295) ADHD, from N = 278 families (age M = 17...
May 12, 2016: World Journal of Biological Psychiatry
https://www.readbyqxmd.com/read/27160695/cingulate-cortical-thickness-and-dopamine-transporter-dat1-genotype-in-children-and-adolescents-with-adhd
#20
Alberto Fernández-Jaén, Jacobo Albert, Daniel Martín Fernández-Mayoralas, Sara López-Martín, Ana Laura Fernández-Perrone, Mar Jimenez de la Peña, Beatriz Calleja-Pérez, Manuel Recio Rodríguez, Sonia López Arribas
OBJECTIVE: This study aimed to examine the influence of dopamine transporter gene (DAT1) 3'UTR genotype on cingulate cortical thickness in a large sample of children and adolescents with ADHD. METHOD: Brain MRIs were acquired from 46 ADHD patients with homozygosity for the 10-repeat allele and 52 ADHD patients with a single copy or no copy of the allele. The cingulate cortex of each MRI scan was automatically parceled into sulci and gyri as well as into Brodmann areas (BA)...
May 9, 2016: Journal of Attention Disorders
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