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Here’s a comment from one of the preeminent biological anthropologists of Melanesia: The mutation, which has no obvious advantages, likely arose by chance in one individual and drifted to a high frequency in the Solomon Islands because the original population was small, says Jonathan Friedlaender, an anthropologist emeritus at Temple University in Philadelphia, Pennsylvania, who was not involved in the study.“This whole area seems to have been populated by very small groups of people making it across these stepping-stone islands, so you do have very dramatic effects in fluctuations of gene frequency.” It is absolutely correct that Oceanian populations exhibit a lot of evidence of small effective population, and so are subject to random genetic drift.
If the drift event occurred in the past, the allele should be fixed, or, it should be extinct.The results are widely known from conference presentations that have been reported, but finally the paper is out in Naturally blond hair is rare in humans and found almost exclusively in Europe and Oceania.Here, we identify an arginine-to-cysteine change at a highly conserved residue in tyrosinase-related protein 1 (TYRP1) as a major determinant of blond hair in Solomon Islanders.Rather, this is a relatively robust recessively expressed trait that seems to have been segregating within these groups before contact.Those individuals who are homozygotes tend to have blond hair, while those who are not tend not to have blonde hair.In this model the frequency of ~0.25 for the allele which results in bondlism in the homozygote in the Solomon islands is high as it is due to a drift event up in frequency from an initial variant mutation. The first is a somewhat technical one: if the high frequency in the Solomons is due to rapid rise in frequency due to large generation-to-generation fluctuations, you’d expect to see some linkage disequilibrium in the region of .
That’s because presumably the blonde allele comes from a common ancestor, which just happened to be over-sampled in a high drift regime.
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TYRP1 is a pigmentation related locus, so it isn’t surprising that the mutation was around that region of the genome.
The key though is to note that the specific mutation is not found in Europeans. The extremely close correspondence between the genotype and the trait, and the lack of similarity in the variants between Europeans and Oceanians, ends debate on questions of the heritability and possible exotic origin of the trait in Oceanians. So how did the Oceanians come to have such a high frequency of this trait?
Rather, blondism crops up in the Solomon Islands, in New Guinea, as well as among some Australian desert groups.