In males the syndrome is associated with profound developmental delay, facial dysmorphism, genital abnormalities and alpha thalassaemia. Female carriers are usually physically and intellectually normal. Language is usually very limited. Seizures occur in about one third of the cases. While many patients are affectionate with their caregivers, some exhibit autistic-like behaviour. Patients present with facial hypotonia and a characteristic mouth. Genital abnormalities are observed in 80% of children and range from undescended testes to ambiguous genitalia. This syndrome is X-linked recessive and results from mutations in the ATRX gene.

In males the syndrome is associated with profound developmental delay, facial dysmorphism, genital abnormalities and alpha thalassemia. Female carriers are usually physically and intellectually normal. Language is usually very limited. Seizures occur in about one third of the cases. While many patients are affectionate with their caregivers, some exhibit autistic-like behavior. Patients present with facial hypotonia and a characteristic mouth. Genital abnormalities are observed in 80% of children and range from undescended testes to ambiguous genitalia. This syndrome is X-linked recessive and results from mutations in the ATRX gene.