This came out yesterday:
https://www.yahoo.com/health/new-breakthrough-in-what-causes-autism-126021062452.html
(where the enzyme UBE3A is always turned "on")

Very recent:
http://abcnews.go.com/Technology/story?id=5353368
(. "This might be an unanticipated way of developing therapies in the long term for autism: Identifying these kids where all the right genes are present, just not turned on in the right way."

At Kennedy Krieger, Goldstein thinks the work may provide a gene-level explanation for why some children already are helped by intense therapy.

"We have trouble getting through to these children, but with repeated stimulation we can do it," he said. "These are circuits that have an ability not so much to recover but to work around the problem.")