Two recent papers have been published that both deal with chromosomal aberrations and autism. One paper reports de novo copy number mutations associated with some cases of autism. These are copy number polymorphisms not present in either parent; the mutation arises in the parental germ line, although, I believe it is also possible the mutation happens after fertilization. The other paper presents data using SNPs and copy number variants to map regions of the genome associated with autism risk. I'm not all that interested in the autism component of this research, but the prevalence of structural variants is pretty cool.
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Any data on Asperger's? I can't access those papers.
In regards to Asperger's, the Science paper (the one about de nove mutations) includes the following:
and
There isn't much of a mention of Asperger in the Nature Genetics paper (the one about mapping variants associated with autism).