Definition Fragile X syndrome (FXS) is now the most common known inherited cause of developmental disabilities, but was not discovered until the late 1970s. By 1980 it was found that people showing certain mental and physical characteristics had a chromosomal abnormality caused by a partial break on an X chromosome, called a "fragile site". In 1991 the Fragile X gene was identified within this site. FXS is named after a site on the long arm of the …showed first 75 words of 2092 total…

…showed last 75 words of 2092 total…and live in supported accommodation or at home. References Finuacane B. Fragile X Syndrome-A Handbook for Families and Professionals. The National Fragile X Foundation, 1993. Hagerman R., Amery C., and Kronister A. Fragile X checklist. The American Journal of Medical Genetics, 1991, 38. 283- 287. Hagerman R.J., and Cronister, A. (eds). Fragile X Syndrome: Diagnosis, Treatment and Research. John Hopkins University Press, 2nd ed, 1996. American Academy of Pediatrics. Health Supervision for Children with Fragile X Syndrome . Pediatrics, 98 (2): August 1996.