Skip to content

Autism Spectrum Disorders Health Center

Autism Cause: Brain Development Genes?

Genes Missing in Autism Needed for Learning-Triggered Brain Growth
Font Size
A
A
A
By
WebMD Health News

July 10, 2008 -- Surprising findings from a gene study have set the world of autism research spinning on a new axis.

The new study shows that many of the different genes linked to autism -- and many of the new autism genes discovered in the course of the study -- are part of a network that allows a child's brain to build new connections in response to experience.

The good news is that a surprisingly large number of these mutant genes affect the on/off switches that control experience-triggered brain development. That's much better than missing the genes themselves, says study leader Christopher A. Walsh, MD, PhD, chief of genetics at Children's Hospital Boston and an investigator at the Howard Hughes Medical Institute.

"We are encouraged that some of these mutations do not seem to completely remove the gene altogether, but instead disrupt its on/off switches," Walsh tells WebMD. "That does offer hope we may be able to figure out other ways of activating the gene."

It's a big deal, says Thomas Insel, MD, director of the National Institute of Mental Health.

"We can begin to think of autism as a disease of synapses, of the way connections are developing in the brain," Insel tells WebMD. "This is really quite intriguing. It adds another region for science to go after to look for new targets for either autism treatment or prevention. It is a very important step."

Autism is a spectrum of different disorders ranging in severity and in symptoms. But all autism disorders have certain things in common: impaired social interactions, impaired communication, and stereotyped interests and behaviors.

The new findings offer a unifying theory, suggesting that many forms of autism result from specific defects that affect a child's ability to learn and remember.

Genetics plays a major role in autism. The mutations that cause fragile X syndrome and Rhett's syndrome result in autism. But unlike diseases such as cystic fibrosis, the vast majority of autism cases can't be traced to a single mutation. Instead, a growing number of different genes have been linked to a growing percentage of autism cases.

Today on WebMD

girl at window
Symptoms within the first 2 years of a child’s life.
boy playing a violin
How is this condition similar to autism?
 
toddler blinking
Learn about the 5 types of PDD.
preschool age girl sitting at desk
What causes this rare form of autism?
 
High Functioning Autism And Asperge Syndrome
Article
Gluten Free Diet Slideshow
Article
 
Dealing With Autism A Familys Journey
Article
Vaccine and needle
VIDEO
 
little boy walking in road
Article
Mother hugging teenage son
Article
 
Understanding Rett Syndrome
Article
Home Care Tips
Article