Mice missing one copy of the autism-linked gene DDX3X have smaller brains and worse motor skills than mice with both copies of the gene, according to a new unpublished study.

Autistic people’s skill at managing the demands of daily life decline after they leave high school, according to a new study. But those who maintain more abilities are more likely to pursue further education than those who don’t.

Genetic sequences from nearly 53,000 people with autism, developmental delay or intellectual disability reveal strong ties to 98 genes.

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.