Featured Research

from universities, journals, and other organizations

Gene Variants May Increase Risk Of Anxiety Disorders

Date:
March 4, 2008
Source:
Massachusetts General Hospital
Summary:
Scientists have discovered perhaps the strongest evidence yet linking variation in a particular gene with anxiety-related traits. Particular versions of a gene that affect the activity of important neurotransmitter receptors were more common in both children and adults assessed as being inhibited or introverted and also were associated with increased activity of brain regions involved in emotional processing. It has long been recognized that the tendency to anxiety disorders can run in families and is believed to be influenced by the interaction of several genes.

Massachusetts General Hospital (MGH) researchers -- in collaboration with scientists at the University of California at San Diego and Yale University -- have discovered perhaps the strongest evidence yet linking variation in a particular gene with anxiety-related traits. In the March issue of Archives of General Psychiatry, the team describes finding that particular versions of a gene that affect the activity of important neurotransmitter receptors were more common in both children and adults assessed as being inhibited or introverted and also were associated with increased activity of brain regions involved in emotional processing.

Related Articles


"We found that variations in this gene were associated with shy, inhibited behavior in children, introverted personality in adults and the reactivity of brain regions involved in processing fear and anxiety," says Jordan Smoller, MD, ScD, of the MGH Department of Psychiatry, the report's lead author. "Each of these traits appears to be a risk factor for social anxiety disorder, the most common type of anxiety disorder in the U.S."

It has long been recognized that the tendency to anxiety disorders can run in families and is believed to be influenced by the interaction of several genes. Because of the different forms of these disorders and their complex patterns of inheritance, identifying specific susceptibility genes has been difficult. Studies in mice have associated an area of chromosome 1 with anxious temperament, particularly the gene that codes for a protein called RGS2, which mediates the activity of neurotransmitter receptors that are also the targets of many antidepressant and antipsychotic drugs. Mice in whom RGS2 is knocked out exhibit increased fearful behavior.

To more comprehensively investigate the role of RGS2 in humans, the researchers conducted several experiments. They analyzed blood samples from children from 119 families who had participated in an earlier study assessing their reactions to unfamiliar situations at the ages of 21 months, 4 and 6 years. The participants had been evaluated on their levels of behavioral inhibition, a form of temperament linked to increased risk of anxiety disorders.. Testing several sites in the RGS2 gene identified nine variations that appeared to be associated with inhibition.

The second experiment involved more than 700 college students who had completed questionnaires designed to measure several personality traits. Analyzing blood samples from this group, the research team genotyped the four gene markers that had demonstrated the strongest effects in the first group. They found that the versions associated with inhibited behavior in the children were also more common in the college students who scored high on measures of introversion, a personality trait that also involves social inhibition.

Another group of 55 college students had functional MRI brain imaging done after they had completed a standard interview screening for anxiety and mood disorders. While in the MR scanner, the participants viewed a series of faces expressing various emotions, a test that previously was shown to influence activity in the amygdala, a brain structure involved in emotion processing. Participants with the inhibition/introversion-associated alleles also had increased activity of the amygdala and the insula, another anxiety-related brain region.

"Now we need to investigate whether these RGS2 variants actually are associated with particular disorders and how they act on a cellular level," says Smoller, an associate professor of Psychiatry at Harvard Medical School. "We hope that ultimately this work will lead to new drug targets and treatment options for anxiety disorders."

The study was supported by grants from the National Institutes of Health, NARSAD (National Alliance for Research on Schizophrenia and Depression), The Rose and Eugene Kleiner Family Foundation and the U.S. Department of Veterans Affairs. Co-authors of the Archives of General Psychiatry report are Jesen Fagerness, Shaun Purcell, PhD, Lesley Yamaki, Dina Hirshfeld-Becker, PhD, Joseph Biederman, MD, and Jerrold Rosenbaum, MD, MGH Psychiatry; Martin Paulus, MD, and Murray Stein, MD, MPH, University of California at San Diego; and Joel Gelernter, MD, Yale University School of Medicine.


Story Source:

The above story is based on materials provided by Massachusetts General Hospital. Note: Materials may be edited for content and length.


Cite This Page:

Massachusetts General Hospital. "Gene Variants May Increase Risk Of Anxiety Disorders." ScienceDaily. ScienceDaily, 4 March 2008. <www.sciencedaily.com/releases/2008/03/080303190630.htm>.
Massachusetts General Hospital. (2008, March 4). Gene Variants May Increase Risk Of Anxiety Disorders. ScienceDaily. Retrieved November 28, 2014 from www.sciencedaily.com/releases/2008/03/080303190630.htm
Massachusetts General Hospital. "Gene Variants May Increase Risk Of Anxiety Disorders." ScienceDaily. www.sciencedaily.com/releases/2008/03/080303190630.htm (accessed November 28, 2014).

Share This


More From ScienceDaily



More Mind & Brain News

Friday, November 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Tryptophan Isn't Making You Sleepy On Thanksgiving

Tryptophan Isn't Making You Sleepy On Thanksgiving

Newsy (Nov. 27, 2014) — Tryptophan, a chemical found naturally in turkey meat, gets blamed for sleepiness after Thanksgiving meals. But science points to other culprits. Video provided by Newsy
Powered by NewsLook.com
Are Female Bosses More Likely To Be Depressed?

Are Female Bosses More Likely To Be Depressed?

Newsy (Nov. 24, 2014) — A new study links greater authority with increased depressive symptoms among women in the workplace. Video provided by Newsy
Powered by NewsLook.com
Winter Can Cause Depression — Here's How To Combat It

Winter Can Cause Depression — Here's How To Combat It

Newsy (Nov. 23, 2014) — Millions of American suffer from seasonal depression every year. It can lead to adverse health effects, but there are ways to ease symptoms. Video provided by Newsy
Powered by NewsLook.com
Could Your Genes Be The Reason You're Single?

Could Your Genes Be The Reason You're Single?

Newsy (Nov. 21, 2014) — Researchers in Beijing discovered a gene called 5-HTA1, and carriers are reportedly 20 percent more likely to be single. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins