Yes, another type of mutation in autism was revealed this week. Those that are evident after the sperm and egg meet to form the zygote but still very early, during embryonic development. Because it occurs after the original zygote is formed, the mutation is not found in every cell or every region of the body, called post-zygotic. A collaboration of three major genetic consortia studied and collaborated on these types of mutations and revealed that they consist of about 7.5% of all de novo mutations in people with autism. They affect autism risk genes and selectively target brain regions associated with autism. Learn more about what this means for family planning and cognitive ability in people with autism.