Ok... there is a serious disparity here.  There seems to be an indiscriminate assumption that genetic mutations must come from the parents.  The article in the second paragraph states: "An estimated 25% of autism spectrum disorder cases are linked to inherited gene mutations that are passed from parent to child. Some of these high-risk genes have already been identified."

"...linked to inherited gene mutations that are passed from parent to child".. No mention in the whole article is there that states the study compared the Autistic children to their PARENTS genes.  

The comparison it says the study made was : " … They then compared the DNA of those with autism to that of their unaffected siblings."   - 6th paragraph.

In the 7th paragraph ; "...Results showed that autism was associated with rare duplications and deletions of stretches of DNA that appear to have arisen spontaneously; "
But where are the parents'?

No mention of a comparison of PARENTS to their Autistic children, to see if in fact the parents have the same mutations.  THIS is imperative.

It is quite possible that siblings could display the same/similar genetic mutations and yet those mutations not result in manifesting the same conditions.  We know that inherited disease genes do not always manifest in children, such a diabetes, cancer, heart disease and others.

The reason for siblings' mutations may be the same influence of their Autistic siblings' but somehow not manifest. (or maybe unnoticeable subtle conditions no one is looking at)

Children are vaccinated at BIRTH and continue to be vaccinated with the same vaccines.  Parents are not.  No genetic tests are performed BEFORE vaccinations.

Genetic researcher Dr Therese Deisher shows that human fetal cells produce hundreds of DNA mutations.  These are contained in vaccines.  A study showed that autism children had hundreds of DNA mutations their parents' DID NOT HAVE.  These spontaneous mutations - as the article also describes as "spontaneous" - only happened in the children and as being such cannot be inheritance is what Dr Deisher states.  See her SoundChoice site.

So where is the common denominator??

Notice the 8th paragraph says:
"“In many diseases, you see an inheritance pattern. You don't see that with autism,” said Michael Ronemus, a co-author of the Cold Spring Harbor team and a research investigator at that institution. The two teams have identified a few dozen of these spontaneous mutations, but there could be as many as 300, Ronemus said. "

NO INHERITANCE PATTERN!