Researchers have identified a distinctive pattern of gene expression in the white blood cells of young autistic boys.

Children who are born with mild heart problems are more likely to be autistic than their typical peers are.

A molecule made by mitochondria, the energy factories of cells, might help doctors forecast the impact of mutations in a top autism gene.

Brain activity patterns in the first year of life may predict autism in infants at high risk for the condition.

Certain patterns of electrical activity in the brain may signal autism in children with tuberous sclerosis complex, a related genetic condition.

Heart-rate patterns and changes in pupil size may herald Rett syndrome, autism or related conditions.