Since the driver of the selection against the related gene seems to be malaria, I wonder if this is linked to prevalence of body hair on human ancestors.<p>Bug bites on hairless skin probably had something to do with dying of disease, and the early homonids that had the gene seem to be the ones hit the hardest.<p>We also see evolutionary markers related to bed bugs, head lice and body lice. Maybe mosquitos and genes linked to a possible malaria pandemic offer more clues.