Fragile X syndrome is as I said before, the most common cause of autism worldwide. This syndrome can cause anxiety learning problems, and more. Fragile X happens when the FMR1 gene is expanded. More into the symptoms, fragile X causes delays in talking, anxiety, hyperactive behavior, and people with fragile X syndrome are known to have seizures. Physical features include a long face, big ears, and flat feet.
Testing for Fragile X syndrome was developed in 1992 just after the FMR1 gene was