genetic basis of autistic behavior?

I have often wondered about much of the psychological interpretations and therapies suggested for my daughter's autistic type behaviors. Though they are more politely couched, they are not far removed from the refrigerator mother theories-- that autism was a psychiatric disorder caused by the mother's rejection of the baby during pregnancy. Reading an article today about the behavioral impacts of mutations on the MecP2 gene made me more curious than ever. (Science Daily Sept. 26, 2008. Mapping the Nueron-behavior Link in Rett Syndrome.)