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Autism and disorders resembling autism can be caused by a number of disorders, including Fragile X Syndrome, tuberous sclerosis, and phenylketonuria, and by at least one notable chromosomal abnormality, an inverted duplication of a portion of chromosome 15. But for the vast majority of cases of autism today, there is no strictly genetic explanation. As with many chronic disorders, most cases of autism appear to be caused by some genetic predisposition coupled with some early environmental insult [Website].
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