Fragile X Syndrome

The genetic disorder Fragile X syndrome, which results from mutations in a gene on the X chromosome, is the most commonly inherited form of developmental and intellectual disability. The NICHD supports and conducts research on the diagnosis, treatment, management, prevention, and inheritance of Fragile X and its associated conditions, Fragile X-Associated Primary Ovarian Insufficiency (FXPOI) and Fragile X-Associated Tremor/Ataxia Syndrome (FXTAS). All three conditions result from changes in the same gene on the X chromosome. 

Common Name

  • Fragile X syndrome or Fragile X

Medical or Scientific Names

  • Martin-Bell syndrome