Dooms,
Yes there a re a number of such studies, here is just one of many.
(I’ll check with my chavrusa or my sister what they feel about this later)
JAMA Psychiatry. 2015;72(5):415-423. doi:10.1001/jamapsychiatry.2014.3028
“Conclusions
The present study combines the strengths of previous studies and provides a more complete picture than any of them individually by being nationally representative and incorporating dimensional and categorical measures using a systematic repeated screening method. We conclude that liability to ASD and a more broadly defined high-level autism trait phenotype in UK twins 8 years or older derives from substantial genetic and moderate nonshared environmental influences. Genetic influences on diagnosed ASD are shared with those on autistic traits in the general population.“