Mice missing the autism gene NLGN3 have altered social behaviors and brain responses to the hormone oxytocin, both of which improve after treatment with a drug that helps regulate protein production.

Repeating bits of the genome may be responsible for nearly 3 percent of the genetic architecture of autism.

A new treatment prevents seizures and improves memory in a mouse model of fragile X syndrome, according to a new study.

Standardized tests can reliably assess memory, language ability, executive function and other traits in people with intellectual disability linked to autism.

Doctors often conflate autism and intellectual disability, and no wonder: The biological distinction between them is murky. Scientific progress depends on knowing where the conditions intersect — and part ways.

A new blood test can identify within seven hours whether a person carries the genetic mutation underlying fragile X syndrome.

For people with fragile X syndrome, progress in daily living skills and behavior tends to stall later in life.

This year’s hot topics in autism research center around brain organoids, heart rate, the gut microbiome, treatment timing and early detection.

Mutations in the gene CSDE1 lead to a constellation of developmental delays and conditions, including autism, according to a new study.

Some traits of fragile X syndrome may be due to problems with mitochondria, the cell’s energy factories.