Fragile X Syndrome

Fragile X syndrome, also known as FXS, is a genetic disorder, which causes a wide range of problems, from learning disabilities or attention deficits to more significant developmental delays or mental retardation. Fragile X syndrome also can cause significant emotional or behavioral problems, including anxiety, panic attacks, and hyperactivity or Attention Deficit Hyperactivity Disorder (ADHD). Fragile X syndrome is the most common cause of inherited mental retardation. Where the X chromosome is viewed under the microscope, it narrows at the site of the mutation. This narrowing makes the X chromosome look fragile, as if it would break, hence the name, fragile X syndrome.