children s health issues
Fragile X Syndrome
Introduction
Fragile X syndrome is a genetic abnormality on the X chromosome that leads to intellectual disability and behavior problems. Chromosomes are structures within cells that contain Fragile X syndrome is the most commonly diagnosed inherited cause of Intellectual Disability , and boys are affected more often than girls. Fragile X syndrome is second only to The symptoms of Fragile X syndrome are caused by an abnormality of a specific gene on the X chromosome (see Gene Abnormalities ). People have an excessive number of copies (more than 200) of a small segment of deoxyribonucleic acid (DNA). People with 55 to 200 extra copies are considered to have a premutation because, although they do not have the disorder, their offspring are at greater risk of having it. 