PLOS Genetics, Bucan M, Abrahams BS, Wang K, Glessner JT, Herman EI, et al.
The study identified 27 different genetic regions where rare copy number variations - missing or extra copies of DNA segments - were found in the genes of children with autism spectrum disorders, but not in the healthy controls. The researchers, including geneticists from the University of Pennsylvania School of Medicine and The Children's Hospital of Philadelphia (CHOP) compared genetic samples of 3,832 individuals from 912 families with multiple autistic children against genetic samples of 1,070 disease-free children. Besides the identification of 27 regions harboring rare variants in children with ASDs, the study also uncovered two novel genes where variations were found, BZRAP1 and MDGA2 - thought to be important in synaptic function and neurological development, respectively. Interestingly, key variants on these genes were passed down in some, but not all, of the affected individuals in families.