Incidently, note that whilst it repeatedly says things like "the most common known single-gene cause of autism" in that Wikipedia article, it also says, under Intellectual Development, "When both autism and FXS are present, a greater language deficit and lower IQ is observed as compared to children with only FXS" which implies, well actually explictly states, that Fragile X can exist in seperation to autism, which is strongly suggestive of a correlatory rather than causal link.
Incidently, note that whilst it repeatedly says things like "the most common known single-gene cause of autism" in that Wikipedia article, it also says, under Intellectual Development, "When both autism and FXS are present, a greater language deficit and lower IQ is observed as compared to children with only FXS" which implies, well actually explictly states, that Fragile X can exist in seperation to autism, which is strongly suggestive of a correlatory rather than causal link.
