Two seemingly similar mutations in the SHANK3 gene have divergent effects on the brain and behavior.

The largest study of people with autism and obsessive-compulsive disorder to date adds to mounting evidence that the two conditions share genetic roots.

A study of more than 2,500 families that have at least one child with autism has found three factors that predict autism symptoms in an unaffected sibling.

Rare antibodies taken from the blood of women who have a child with autism cause brain structure changes and autism-like symptoms in male mice.

Inhaling puffs of the hormone oxytocin modestly improves social behaviors, the first trial of the hormone in children with autism has found.

Structural changes in the connections between neurons may underlie the enhanced learning and motor skills of a mouse model of autism.

Tracking dozens of autism-related behaviors in nearly 200 strains of mice, researchers are linking the behaviors to specific genetic regions.