No.
I've had my DNA sequenced and analyzed. My results point to the following:
A) I'm at an increased risk for late onset of Alzheimer's around 80
B) I'm at a decreased to almost no risk of dementia due to the amount of DNA that matches to Neanderthal ancestry
C) I'm at increased risk for being Autistic, this is certainly the case as a result of self diagnosis and test scores
The DNA markers and studies across the three are looking at different portions of the DNA.