About 1 in 4,000 males and 1 in 8,000 females have Fragile X syndrome.1
Although Fragile X syndrome is relatively rare, premutations in the FMR1 gene are relatively common: A recent study of 6,747 people found that 1 in 151 women and 1 in 468 men had the premutation.2 People with the premutation might not have any symptoms of Fragile X. However, the premutation can sometimes expand in the next generation, which can cause Fragile X syndrome.
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