An interactive assessment allows clinicians and researchers to evaluate an autistic child’s use of language in everyday social situations.

All five participants in a clinical trial of a gene therapy for Angelman syndrome experienced leg weakness, leading sponsors to pause the study.

Extremely preterm babies later diagnosed with autism tend to show steep declines in development, a pattern that could flag them for intervention as early as 6 months of age.

A new survey shows that children with autism or other developmental disabilities in the United States are at least twice as likely to have asthma as their neurotypical peers are.

A common autism screening tool misses more than 70 percent of autistic toddlers but flags more than 80 percent of non-autistic toddlers who have intellectual disability.

A new analysis links individual mutations in a gene called PTEN to a person’s odds of having autism, cancer or other conditions.

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.

Individuals with mutations in an autism gene called TRIO may have a range of conditions, including intellectual disability and anomalous head size.

Researchers have cataloged more than 100 mutations in DDX3X, a candidate gene for autism.

People with mutations in a gene called TBR1 have unusual features in several brain regions, along with autism traits and developmental delay.