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Fragile X is the most common inherited cause of intellectual disabilities. It is also the most common known cause of autism. Click on an image below to find out more.

Symptoms usually include intellectual disabilities, ranging from mild to severe, attention deficit and hyperactivity, anxiety and unstable mood, and autism.
Fragile X is caused by a defect in a single gene. This gene, called FMR1, shuts down and fails to produce a protein vital for brain development.
A DNA test for Fragile X is available. This blood test is accurate and can detect carriers and fully-affected individuals. Any doctor can order the test.
There is currently no cure for Fragile X, although appropriate education and medications can help maximize the potential of each child.