Fragile X syndrome is an inherited disease caused by an excessive length of the FMR protein due to mutations in the FMR1 gene located on the X chromosome. It is commonly described as one of the most common genetic diseases with autism-like behaviours and related developmental disabilities. Beside intellectual delays, behavioural problems, and communication difficulties, mood disorders usually occur. Diagnosis is based on laboratory tests and DNA results. Phenotypes including long and narrow face, large ears, hyper-arched palate, flat feet, ataxia, seizures, anxiety, aggression, and...