Gene-environment Interactions and Brain Functional Connectivity in Attention Deficit Hyperactivity Disorder

November 26, 2014 updated by: Jae-Won Kim, Seoul National University

Gene-environment Interactions and Brain Functional Connectivity Associated With Norepinephrine System Genes in Attention Deficit Hyperactivity Disorder

The aims of the current study are to examine gene-environment interactions associated with norepinephrine (NE) system genes (ADRA2A, SLC6A2) in ADHD, and to evaluate whether genetic changes in norepinephrine pathway are associated with differences in functional connectivity of white matter fiber tracts, as measured by diffusion tensor imaging (DTI). Furthermore, this study aims to examine neurobiological markers, such as intermediate neuroimaging phenotypes or neuropsychological endophenotypes associated with the pathophysiology of ADHD. Through evaluating drug responses and side effects with the associated measures of clinical, neuropsychological and neuroimaging characteristics, investigators would like to investigate predictors of treatment response associated with NE system genes in ADHD.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

83

Phase

  • Not Applicable

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

6 years to 18 years (Child, Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Clinical diagnosis of Attention-deficit Hyperactivity Disorder
  • 6-18 years old

Exclusion Criteria:

  • History of neurological diseases, including convulsive disorders or brain damage
  • IQ below 70
  • Pervasive developmental disorder (autism)
  • Language difficulties or learning disorders (reading disorders, mathematics disorders and disorders of written expression).
  • Tourette's syndrome
  • Bipolar disorder
  • Psychosis

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Basic Science
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Methylphenidate
Participants were treated with methylphenidate (ranging from to 63mg) for 8 weeks. Doses of methylphenidate were titrated depending on symptoms and adverse eff ects at the 2nd and 4th weeks of treatment.
Drug: Methylphenidate

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change From Baseline ADHD Rating Scale-IV Scores at 8 Weeks
Time Frame: baseline and 8 weeks

Attendtion-deficit hyperactivity disorder (ADHD) Rating Scale-IV is the sum of 18 questions, ranging from 0 (no symptoms) to 54 (worst possible symptoms).

Change from baseline ADHD Rating Scale-IV scores at 8 weeks was calculated as baseline minus 8 weeks.
baseline and 8 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Clinical Global Impression-Improvement Scale at 8 Weeks
Time Frame: baseline and 8 weeks

Clinical Global Impression-Improvement (CGI-I) scale is a one-item measure evaluating the change from the initiation of treatment on a seven-point scale: "Compared to the patient's condition at baseline [prior to medication initiation], this patient's condition is: 1=very much improved since the initiation of treatment; 2=much improved; 3=minimally improved; 4=no change from baseline (the initiation of treatment); 5=minimally worse; 6= much worse; 7=very much worse since the initiation of treatment.

Clinical Global Impression-Improvement was measured at 8 weeks.
baseline and 8 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Seoul National University

Collaborators

Korea Research Foundation

Investigators

  • Principal Investigator: Jae-Won Kim, MD., PhD., Seoul National University and Seoul National University Hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

May 1, 2010

Primary Completion (Actual)

April 1, 2013

Study Completion (Actual)

April 1, 2013

Study Registration Dates

First Submitted

July 16, 2013

First Submitted That Met QC Criteria

July 29, 2013

First Posted (Estimate)

July 31, 2013

Study Record Updates

Last Update Posted (Estimate)

December 4, 2014

Last Update Submitted That Met QC Criteria

November 26, 2014

Last Verified

November 1, 2014

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2010-0002283

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Subscribe