MIT reverses autism in mice

I recently received an email with the article below. One thing that I found interesting in the article was the following quote "Suppressing it can counteract the effects of Fragile X Syndrome (FXS), the leading cause of retardation and a genetic autism, MIT said Sunday." The "genetic autism" was what caught my eye. Is the rash of autism not only in the US but all over the world "genetic" or are all of these children just predisposed to autism anyway and develop it because of pollution and the mercury that is in immunizations? Maybe it is just all of the above? There are several states that are major polluters and have a huge clusters of autism cases are New Jersey, Texas and North Carolina. A cure to autism and other diseases like this need to be found, I hope that this article will help with this.