Always been the smarty pants in your group? Awww, SNAP! Chances are, it’s in your DNA.
A study of Dutch families (Gosso MF et al., 2006) found that Single Nucleotide Polymorphism (SNP) rs363050, located on the SNAP-25 gene is associated with “performance IQ” (i.e. non-verbal IQ).
Each copy of “A” at rs363050 in a person’s genotype increased the subjects’ performance IQ by an average of three points compared to those with no copies of “A”.The authors estimated that rs363050 accounts for 3.4% of the variation in performance IQ between people.
I learned this little tidbit while exploring my Health Traits on the 23andMe website. A single user-posted question, “Is There Anyone Else with 2 Copies of the Gene for Intelligence?” sparked over 260 replies from users sharing their genotypes, those of their family members, as well as IQ scores, SAT/GRE scores, levels of degrees obtained, and much more to both support AND oppose the findings of this research.
When you get down to brass tacks, no one who fancies him/herself as intelligent wants to look at their own genotype & have it read otherwise … anymore than someone wants their Kindness Gene genotype to tell them they can’t be empathetic.
Of course for this and other similar discussions, there is the nature vs. nurture debate … it can be challenging to study heritability or genetic differences in intelligence due to the fact that it is difficult to rule out other factors such as environment and opportunities (Rowe et al., 1999; Turkheimer et al., 2003).
What are your thoughts re: intelligence and heritability vs. outside influences such as environment?
Have you been tested on 23andMe? If yes, was your genotype what you expected?