EzraS wrote:
A thing to keep in mind is there are cases of identical twins, where only one is autistic.
My personal hypothesis (which is
not backed up by research, so I don't know if the science supports it at all) is that it is
epigenetic: in which an environmental factor like a virus or chemical turns a gene on or off. So your identical twins might both have the
potential for autism spectrum disorders, but only one has been exposed to the trigger and is autistic. The other twin would be a carrier for the gene, which he or she would pass on to his or her children. This might also mean that ASD skips generations, or is shown in nieces and nephews. I also suspect that ASD may be polygenic, caused by multiple genes, like schizophrenia, or may even be different genes causing similar conditions, which would account for the great variation in severity and symptoms.
Again, I haven't researched the genetic component of ASD, and I
haven't studied genetics in 20 years, so I am sure that others here can tell us if current studies support or refute any of this. I hope these might be interesting avenues of research, however.
_________________
Diagnosed Bipolar II in 2012, Autism spectrum disorder (moderate) & ADHD in 2015.