Track topics on Twitter Track topics that are important to you
The ultimate goal of this study is to find specific polymorphism of candidate genes (particularly of dopaminergic and noradrenergic systems) associated with intermediate phenotypes (e.g., executive functions, IQ, and other neuropsychological function) and/or phenomenological phenotypes (subtypes, comorbidity, dimensional approach) of ADHD. We propose to replicate the analysis of the candidate genes identified by previous genetic studies and recent findings from GWAS on ADHD using the candidate gene association study design (family-based case control study using parental controls and population-based case-control study). These results may lead our research team: (1) to resolve controversies over inconsistent findings in previous genetic studies and contribute to the literature on the validity of ADHD and its subtypes using clinical and genetic data; (2) to identify potential endophenotypes for ADHD genetic studies; and (3) to identify specific polymorphism of candidate genes and gene expressions of dopaminergic and noradrenergic systems associated with executive functions measured by the CANTAB.
Attention deficit hyperactivity disorder (ADHD) is a common, impairing, highly heritable, clinically heterogeneous early-onset neuropsychiatric disorder. Despite substantial evidence supporting genetic etiology of ADHD, molecular genetic studies so far have not yet provided any conclusive results using the categorical or subgroup approach of phenotype. Hence, there has been growing interest in using endophenotypes in molecular genetic studies on ADHD. Our previous studies have demonstrated significant deficits in executive functions among children with ADHD and the efficacy of methylphenidate and atomoxetine, involving dopaminergic and noradrenergic systems, in reducing ADHD core symptoms and improving executive functions. In a longitudinal follow-up family study on ADHD, we also reported that executive dysfunctions measured by the Cambridge Neuropsychological Test Automated Batteries (CANTAB) are potential endophenotypes for ADHD. Hence, identifying specific polymorphism of candidate genes of dopaminergic and noradrenergic systems associated with executive dysfunctions in Han Chinese in Taiwan is warranted.
1. To identify specific genetic polymorphism of candidate genes of dopaminergic and noradrenergic systems (e.g., DRD2, DRD4, DRD5, DAT1, NET, ADRA2A, DBH, COMT etc.) associated with executive dysfunctions measured by the CANTAB and other alternative phenotype approaches (ADHD subtypes, comorbidities, treatment effects, IQ, symptom dimensions and severity);
2. to investigate the relationship between a variety of ADHD phenotypes and endophenotypes and gene expressions of DRD2, DAT1, NET, ADRA2A, DBH, and COMT;
3. to validate executive functions and to search for other neuropsychological functioning as endophenotypes for ADHD; and
4. to determine whether ADHD is familial and identify which core symptoms of ADHD and which component of neuropsychological functioning are most familial;
Subjects and Methods: The major study design is the family-based case-control candidate gene association study. We will recruit 150 probands with ADHD, aged 7-18, and their parents (n = 300) and siblings (n= 150) and 150 school controls in three years (50, 60, and 40 families with ADHD and 50, 60, 40 school controls in the 1st, 2nd, and 3rd year, respectively). The measures include (1) interviews for psychopathology (K-SADS-E) and social functioning (SAICA), (2) self-administered questionnaires to measures ADHD symptoms (CPRS-R:S, CTRS-R:S, SNAP-IV and Adult ADHD rating scale) and comorbid conditions (ASRI and CBCL), and (3) neuropsychological tests: WISC-III-R, CPT, CANTAB, and Time Perception Tasks. The transmission/disequilibrium test (TDT) and quantitative TDT by using FBAT and FBAT-GEE, GEE, and Mixed Models will be used for data analysis.
Anticipated Results: We anticipate the establishment of clinical, neuropsychological, and genetic database of at least 350 families (150 families in this project) and 150 same-age controls, the completion of genetic analysis and gene expressions of several candidate genes including those involving dopaminergic and noradrenergic systems, and identification of genetic variants for ADHD diagnosis, symptoms, and comorbidities, executive functions, and other neurocognitive endophenotypes in a Taiwanese sample. The findings of different approaches to identify the genetic etiologies for ADHD in this study should help us determine the most promising approach for future molecular genetic studies on ADHD.
Attention Deficit Hyperactivity Disorder
National Taiwan Univeristy Hospital
Not yet recruiting
National Taiwan University Hospital
Published on BioPortfolio: 2014-08-27T03:16:32-0400
The purpose of this study was to identify genetic, brain morphologic, and environmental biomarkers that contribute to the pathophysiology of attention-deficit/hyperactivity disorder (ADHD)...
The purpose of this study is to find out whether atomoxetine (also called Strattera) helps teenagers (12-19) with Attention Deficit Hyperactivity Disorder (ADHD) and drug/alcohol problems.
The purpose of this research is to assess and determine brain oscillations or "brain signatures" of adult participants with Attention Deficit Hyperactivity Disorder (ADHD) relative to adul...
The purpose of the study is to investigate the relationship of changes in measures of academic performance and problem behaviors, to changes in core Attention-Deficit/Hyperactivity Disorde...
The purpose of this study is to test if the investigational medication ABT-089 is a safe and effective treatment for children with Attention Deficit Hyperactivity Disorder (ADHD).
Attention-deficit/hyperactivity disorder (ADHD) is characterized by persistent symptoms of lack of attention, impulsivity and hyperactivity. The association between nutritional exposures and ADHD has ...
The aim of this study was to evaluate maternal, prenatal, perinatal, and postpartum parameters as risk factors for the later development of an attention deficit hyperactivity disorder (ADHD) in the ch...
The severity of the functional difficulties of children with attention-deficit/hyperactivity disorder (ADHD) is heterogeneous and may be affected by measurable factors.
Attention-Deficit Hyperactivity Disorder (ADHD) encompasses other symptoms besides inattention, hyperactivity, and impulsivity, such as language problems. ADHD can have a non-remitting course and is a...
It has long been recognized that bipolar disorder (BD) and attention deficit-hyperactivity disorder (ADHD) co-occur in an uncertain proportion of patients, recognized commonly in juvenile years. There...
A behavior disorder originating in childhood in which the essential features are signs of developmentally inappropriate inattention, impulsivity, and hyperactivity. Although most individuals have symptoms of both inattention and hyperactivity-impulsivity, one or the other pattern may be predominant. The disorder is more frequent in males than females. Onset is in childhood. Symptoms often attenuate during late adolescence although a minority experience the full complement of symptoms into mid-adulthood. (From DSM-IV)
A propylamine derivative and selective ADRENERGIC UPTAKE INHIBITOR that is used in the treatment of ATTENTION DEFICIT HYPERACTIVITY DISORDER.
A methylphenidate derivative, DOPAMINE UPTAKE INHIBITOR and CENTRAL NERVOUS SYSTEM STIMULANT that is used in the treatment of ATTENTION DEFICIT HYPERACTIVITY DISORDER.
A dextroamphetamine drug precursor that also functions as a CENTRAL NERVOUS SYSTEM STIMULANT and DOPAMINE UPTAKE INHIBITOR and is used in the treatment of ATTENTION DEFICIT HYPERACTIVITY DISORDER.
The d-form of AMPHETAMINE. It is a central nervous system stimulant and a sympathomimetic. It has also been used in the treatment of narcolepsy and of attention deficit disorders and hyperactivity in children. Dextroamphetamine has multiple mechanisms of action including blocking uptake of adrenergics and dopamine, stimulating release of monamines, and inhibiting monoamine oxidase. It is also a drug of abuse and a psychotomimetic.
Psychiatry is the study of mental disorders and their diagnosis, management and prevention. Conditions include schizophrenia, severe depression and panic disorders among others. There are pharmaceutical treatments as well as other therapies to help...
Pediatrics is the general medicine of childhood. Because of the developmental processes (psychological and physical) of childhood, the involvement of parents, and the social management of conditions at home and at school, pediatrics is a specialty. With ...
Bioinformatics is the application of computer software and hardware to the management of biological data to create useful information. Computers are used to gather, store, analyze and integrate biological and genetic information which can then be applied...