It’s always talked about in race realist circles what caused the migration Out of Africa and what gives us an urge and sense of wonder for adventure. Well, like with most things in life, there is a genetic reason behind it.
And what do you know, I was right.
Seems like the gene developed around 40,000 years ago. It’s obviously not just a coincidence or ‘correlation doesn’t equal causation’ argument, as a whole bunch of research backs this gene, and specific alleles, to certain traits in humans, compared to migration, or lack thereof, around the world.
From some research, I found that the abstract of the article says: it’s linked to hyperactivity, novelty-seeking and risk-taking behaviors. Consistent with findings in animal studies was: having more exploratory behavior as well as increased speed and locomotion. Populations with a history of migration in the past 1 to 30,000 years will show the highest instance of having the DRD4 alleles. Those that migrated more miles have a higher rate than those that migrated less. Sedentary populations show a lower instance of the DRD4 allele.
The abstract also says “After compiling existing data on DRD4 allele frequencies of 2,320 individuals from 39 populations and on the migration pattern of these groups, we found that, compared to sedentary populations, migratory populations showed a higher proportion of long alleles for DRD4.”
A correlation of .85 was found with km traveled and rate of DRD4 allele frequency distributions, which support the hypothesis. Nomadic populations had a 10.4 percent higher rate of DRD4 long alleles than sedentary ones.
Here is a blog post talking about the DRD4-7 genes and how they are involved with dopamine levels in the brain and have to do with motivation and behavior.
It cites a researcher saying that the gene occurs in populations that migrated first and furthest out of Africa are more likely to have the gene.
Another blog talks about how Africans with the 4R allele stayed in Africa whereas those with the 7R left and explored the world.
Research has found that it’s easier for the 2R allele to mutate into a 7R allele than for a 7R allele to mutate back to a 4R allele.
So it’s thought that those who emigrated but remained closer to Africa, such as Asia, lost the behavior to explore and settled rather than explore the Americas (which Siberians did do, who eventually became Indians. I would assume that they would have a higher prevalence of this gene, being as they migrated to the Americas while the Africans stayed in Africa, as well as Indians being the furthest genetically from Africans, it also makes sense there). Also saying that those who emigrated to Asia had the 7R, but stayed and it mutated to the 2R over time.
It says looking at the global prevalence of certain allele frequencies, the 4R is more common in Africa, the 2R in Asia, the 7R in the Americas (mostly South), supporting the theory for the 7R allele being the cause for global expansion and positive selection.
Found this article talking about how the DRD4 allele is a role “in the escalation of substance use during adolescence and potential for an enhanced understanding of early-onset substance use.” and those with the 7R allele “Supporting the differential susceptibility to parenting hypothesis, the results suggest a greater preventive effect for youths carrying a 7-repeat allele”.
This NatGeo article says “Most provocatively, several studies tie 7R to human migration. The first large genetic study to do so, led by Chuansheng Chen of the University of California, Irvine in 1999, found 7R more common in present-day migratory cultures than in settled ones. A larger, more statistically rigorous 2011 study supported this, finding that 7R, along with another variant named 2R, tends to be found more frequently than you would expect by chance in populations whose ancestors migrated longer distances after they moved out of Africa. Neither study necessarily means that the 7R form of the gene actually made those ancestors especially restless; you’d have to have been around back then to test that premise with certainty. But both studies support the idea that a nomadic lifestyle selects for the 7R variant.”
All in all, this shows a genetic reason WHY the migration OoA began. It’s very telling that the DDR7 allele first arose when we migrated OoA.