We know that there is a relationship between autism and genetics. Indeed we conducted a very revealing poll in the subject a few years back. You can see the results here.

But for an updated overview of autism and genetics please have a look at this fascinating video of a talk by Daniel H. Geschwind. Daniel H. Geschwind is a professor of human genetics at the David Geffen School of Medicine at the University of California, Los Angeles (UCLA). He also directs the Neurogenetics Program and the Center for Autism Research and Treatment at UCLA.