An X-linked mutation associated with a fragile site near the tip of the long arm of the X chromosome that is the most common cause of inherited mental impairment. FXS is associated with a range of impairments from learning disabilities to more serious cognitive disabilities, and is the most common known cause of autism or "autistic-like" behaviors. Symptoms also can include characteristic physical and behavioral features and delays in speech and language development. Fragile X can be passed on in a family by individuals who have no apparent signs of this genetic condition. In some families a number of family members appear to be affected, whereas in other families a newly diagnosed individual may be the first family member to exhibit symptoms.
No programs.