Worth investing in, and the evidence is amassing. The incidence is increasing, like many other modern diseases, and that behooves us to act.
"Dr. Bourgeron and his colleagues used very detailed methods to screen over three hundred individuals with autism spectrum disorders in order to detect any type of small scale chromosomal abnormality or DNA sequence change. Three families with important changes were identified. In two of these families, one copy of the gene was damaged, leading to formation of a disrupted SHANK3 protein in the affected individuals. All of the children carrying these mutations had been diagnosed with autism and had severely disrupted language. In the remaining family, one child with autism and language delay was found to be missing a copy of the gene, while their sibling with Asperger's and precocious language development, was actually found to have an extra copy of the gene. These results clearly reveal that changes in the SHANK3 gene can be associated with autism spectrum disorders. Additionally, it suggests that the synaptic pathway in which SHANK3 operates is very sensitive to the number of copies ("dosage") of the gene, and that language and cognitive defects can result if the pathway is disturbed in any way."
http://www.autismspeaks.org/science/science_news/shank3_mutations.php My cousin married someone with high-functioning Asperger's and their daughter is just amazing at verbal communication.