Fragile X syndrome

The fragile X syndrome is a syndrome is the leading cause of inherited mental retardation (second leading cause of mental retardation of genetic origin after trisomy 21) 
6% of children with learning disorders are carriers of this syndrome. The disease does not malformation and children affected by the disease have normal growth. 
The disease manifests itself mainly in boys mainly by delays in mental and behavioural disorders various up autism. The girls affected by this disease have a delay intellectual means. 
The disease reached 12 000 people in France.