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[–] 6 points 1 year ago (4 children)

We know it's HEAVILY influence by genetics, but there seems to be some other component as well. That unknown piece, from what I understand, has not been discovered.

In identical twins (same DNA,) If one twin has ASD, the other only has it 96% of the time. If it was purely genetic, this should be 100%.

https://www.nih.gov/news-events/news-releases/severity-autism-symptoms-varies-greatly-among-identical-twins

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  • [–] 6 points 1 year ago (1 child)

    Not true, that's called twin discordance. It's very common. While they were born with the same DNA sequence, every person develops slightly differently and has a different epigenetic profile. The concept that twins are identical when developed was outdated about 20 years ago.

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