They are DIFFERENT. Fragile X Syndrome is often mistaken for Autism, but they are NOT the same. Fragile X Syndrome is one of the leading inherited causes of intellectual Disability and the only known single gene cause of Autism. Both conditions can involve social challenges and developmental delays, but Fragile X Syndrome has a specific genetic cause and presents with its own unique set of symptoms. Autism is a behavioural condition and has no blood test to confirm it, whilst Fragile X Syndrome