People with autism may show scant activity in a poorly understood molecular process thought to regulate gene expression.

Carriers of fragile X premutations in Ricaurte, Colombia, have more medical problems than carriers living elsewhere — and discovering why might yield treatments for the syndrome.

Administering a cholesterol drug alongside an antibiotic eases atypical behavior and restores the signaling balance in the brains of people with fragile X syndrome.

The motion perception difficulties seen in people with fragile X syndrome, a leading cause of autism, may stem from a faulty visual circuit.

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.