The document discusses neurogenesis as it relates to autism. It states that genetic mutations can cause molecular switching on/off, increasing the risk of developing autism spectrum disorder. Specifically, it mentions that changes in the UBE3A gene, which encodes the ubiquitin protein ligase E3A, have been linked to neurogenesis mechanisms involved in autism. The role of this gene and protein in neurogenesis and how their dysfunction may contribute to autism is an area of ongoing research.