A new advocacy group for people with severe autism taps into the deep divide in the community over who should speak for those on the spectrum.

Una remota ciudad colombiana es el hogar del grupo más grande de personas con síndrome de X frágil. Los científicos están aprendiendo de ellos y tratando de ayudar.

This year’s list of top papers highlights new dimensions in our understanding of autism genetics and hints at novel treatments.

A lack of interest, training and pay may limit the supply of specialists best equipped to diagnose and treat children with autism.

Mice lacking one copy of a gene linked to autism are small and show striking changes in the number and quality of their cries.

In “The Boy Who Loved Too Much,” a woman tries to cocoon her son, who has Williams syndrome, from life’s insults but later realizes her protective instincts carry dangers of their own.

Fragile X syndrome is a leading genetic cause of autism. People who have either condition often share certain traits, such as difficulties in social situations.

A remote Colombian town is home to the world’s largest cluster of people with fragile X syndrome. Scientists are learning from them — and trying to help.

Genetic variants across the genome contribute to about 8 percent of the risk for certain developmental conditions — much more than previously thought.

More than half of people on the spectrum have four to five other conditions. Which conditions, and how and when they appear, varies from one autistic person to the next.