Touted "Depression Risk Gene" May Not Add to Risk After All

A gene variation long thought to increase a person’s risk for major depression when paired with stressful life events may actually have no effect, according to a new analysis. The result challenges a common approach to studying depression risk factors.

Most mental disorders are thought to be caused by a combination of many genetic risk factors interacting with environmental triggers. Finding the exact combinations of factors, however, has been a significant challenge. Advances during the past decade have led to powerful tools for studying how genes and the environment interact to affect the risk for disease. In 2003, these advances allowed scientists to show that variation in a gene called the serotonin transporter gene affected the risk of major depression in people who had a number of stressful life events over a 5-year period.

Serotonin is a chemical messenger that helps brain cells communicate. The serotonin transporter directs serotonin from the space between brain cells back into the cell for reuse. Since the most widely prescribed class of medication for treating major depression acts by blocking this protein, it’s been a prime suspect in mood and anxiety disorders.

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Experimental Medication Ketamine Relieves Depression In Just Hours: Points To Targets For New Medications

A new study has revealed more about how the medication ketamine, when used experimentally for depression, relieves symptoms of the disorder in hours instead of the weeks or months it takes for current antidepressants to work. While ketamine itself probably won't come into use as an antidepressant because of its side effects, the new finding moves scientists considerably closer to understanding how to develop faster-acting antidepressant medications -- among the priorities of the National Institute of Mental Health (NIMH), part of the National Institutes of Health.

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Improvement Following ADHD Treatment Sustained In Most Children

Most children treated in a variety of ways for attention deficit hyperactivity disorder (ADHD) showed sustained improvement after three years in a major follow-up study funded by the National Institutes of Health's (NIH) National Institute of Mental Health (NIMH). Yet increased risk for behavioral problems, including delinquency and substance use, remained higher than normal.

The study followed-up children who had participated in the Multimodal Treatment Study of Children with Attention Deficit Hyperactivity Disorder (MTA).

Initial advantages of medication management alone or in combination with behavioral treatment over purely behavioral or routine community care waned in the years after 14 months of controlled treatment ended. However, Peter Jensen, M.D., Columbia University, and colleagues emphasized that "it would be incorrect to conclude from these results that treatment makes no difference or is not worth pursuing."

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Bipolar spectrum disorder may be underrecognized and improperly treated

A new study supports earlier estimates of the prevalence of bipolar disorder in the U.S. population, and suggests the illness may be more accurately characterized as a spectrum disorder. It also finds that many people with the illness are not receiving appropriate treatment. The study, published in the May 2007 issue of Archives of General Psychiatry, analyzed data from the National Comorbidity Survey Replication (NCS-R), a nationwide survey of mental disorders among 9,282 Americans ages 18 and older. The NCS-R was funded by the National Institutes of Health's National Institute of Mental Health (NIMH).

NIMH researcher Kathleen Merikangas, Ph.D. and colleagues identified prevalence rates of three subtypes of bipolar spectrum disorder among adults. Bipolar I is considered the classic form of the illness, in which a person experiences recurrent episodes of mania and depression. People with bipolar II experience a milder form of mania called hypomania that alternates with depressive episodes. People with bipolar disorder not otherwise specified (BD-NOS), sometimes called subthreshold bipolar disorder, have manic and depressive symptoms as well, but they do not meet strict criteria for any specific type of bipolar disorder noted in the Diagnostic and Statistical Manual for Mental Disorders (DSM-IV), the reference manual for psychiatric disorders. Nonetheless, BD-NOS still can significantly impair those who have it.

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