Some Autism Behaviors Linked to Altered Gene (image) Washington University School of Medicine Share Print E-Mail Caption A limited number of neurons (red) in the brain produce serotonin, a chemical messenger. A newly identified genetic mutation can disrupt the production of serotonin and may underlie common behaviors seen in some people with autism, such as difficulty communicating and resistance to change, according to new research at Washington University in St. Louis and Rockefeller University in New York. Credit Washington University Usage Restrictions Credit to Washington University Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.