Kraichgauer wrote:
Meh, this virus thing is just the latest craze. Who knows, maybe there's something to it, but I personally have doubts. I think the best bet is that autism is genetic.
-Bill, otherwise known as Kraichgauer
It is genetic, but that's only half the truth. Think of it like a genetic predisposition for heart disease or cancer. A healthy lifestyle can prevent these diseases, even if people are genetically susceptible.
The same has been found for neurological disorders such as schizophrenia. Not all genetically predisposed people develop this disease. It only kicks in when certain environmental stressors occur (in this case increased stress, abuse, or a dysfunctional family environment).
In case of autism, it is assumed that the environmental trigger occurs at a very early age. We don't know exactly what the trigger is, but we do know that there must be one thanks to twin studies (
link). The autoimmune antibodies that have been found in the brains of autistics (see link in my first post in this thread) point towards an infection during early development, followed by a misguided immune response that attacks brain tissue.
Quote:
If autism were entirely genetic, the presence of the disorder in one identical twin would nearly guarantee its presence in the other twin. But the results of the study showed that if one identical twin had autism, the chance of the other twin having the disorder was about 60 percent to 70 percent.
Fraternal twins, meanwhile, shared an autism diagnosis between 20 percent and 30 percent of the time, a number higher than the researchers had anticipated. Fraternal twins share no more DNA than any other siblings, but they do share the same womb, meaning that could play a role.