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ADHD research by SUNY Upstate faculty in issue of American Journal of Medical Genetics
SYRACUSE, N.Y.— The first genome-wide study on children with Attention Deficit/Hyperactivity Disorder (ADHD), led by Stephen Faraone, Ph.D., professor of psychiatry, neuroscience and physiology at SUNY Upstate Medical University, is featured in a special issue of American Journal of Medical Genetics (AJMG): Part B: Neuropsychiatric, released this month. The issue covers major trends in the field of complex psychiatric genetics, underscoring how genetic studies of ADHD have evolved, and what approaches are needed to uncover its genetic origins.
ADHD is a complex condition with environmental and genetic causes. It is characterized by developmentally inappropriate levels of inattention, hyperactivity and impulsivity that has an onset in childhood. It is one of the most common psychiatric diseases, affecting between 8-12 percent of children worldwide. The drugs used to treat ADHD are highly effective, making ADHD one of the most treatable psychiatric disorders. However, despite the high efficacy of ADHD medications, these treatments are not curative and leave patients with residual disability. Because ADHD is also one of the most heritable of psychiatric disorders, researchers have been searching for genes that underlie the disorder in the hopes that gene discovery will lead to better treatments for the disorder.
Among the many studies in the issue are two from the first genome-wide association study of individual ADHD patients. The study examined more than 600,000 genetic markers in over 900 families from the largest genetic study of ADHD, the International ADHD Multicenter Genetics (IMAGE) project led by Faraone. This work was funded through the Genetics Analysis Information Network (GAIN), a public-private partnership between the National Institutes of Health and the private sector with the goal of promoting genome mapping for various complex diseases.
The studies found that one genetic marker may be associated with ADHD symptoms. The studies, suggests that many genes are involved in ADHD and that each of these have small effects. Thus, larger studies are needed to fully understand the genetic mechanisms underlying ADHD and whether these initial findings can be confirmed.
Another Faraone-led study, funded by Shire Development, is the first genome-wide study of response to methylphenidate in ADHD children. Faraone and his colleagues, examined genetic markers across the entire human genome to search for genes that may someday be used to predict which children respond most favorably to the stimulant medications used to treat ADHD. It demonstrated that, although there are likely to be genetic factors that are associated with stimulant efficacy in children with ADHD, there are no single genes with a very large impact on treatment response.
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