What is name of the recently discovered genetic mutation that some Jews have that makes them 15points smarter?

Question

Last year I read an article about a genetic abnormality among Jews. Some of them had one gene that caused them to be on average 15 points smarter in I.Q. than those without this genetic abnormality, which causes their brain cells to form more connections with each other. But if the person has two copies of this gene, they get one of several brain diseases and die by the time they are 30. I forgot where I read the article and cannot find it. I met someone who is dieing of this, and his children have it too, so I need to find the information quickly if possible.

Answer 1

I believe you're referring to Ashkenazi Jews, and the diseases are Tay-Sachs and Gaucher's. I don't know how valid the genetic-intelligence factor is, but I've attached a link below. I'm sorry to hear about your friend.

Answer 2

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