The evolutionary history of a salivary protein may point to interbreeding between humans and an enigmatic ancient relative
In saliva, scientists have found hints that a â€œghostâ€ species of archaic humans may have contributed genetic material to ancestors of people living in Sub-Saharan Africa today.
The research adds to a growing body of evidence suggesting that sexual rendezvous between different archaic human species may not have been unusual.
Past studies have concluded that the forebears of modern humans in Asia and Europe interbred with other early hominin species, including Neanderthals and Denisovans. The new research is among more recent genetic analyses indicating that ancient Africans also had trysts with other early hominins.
â€œIt seems that interbreeding between different early hominin species is not the exception â€” itâ€™s the norm,â€ says Omer Gokcumen, PhD, an assistant professor of biological sciences in the University at Buffalo College of Arts and Sciences.
â€œOur research traced the evolution of an important mucin protein called MUC7 that is found in saliva,â€ he says. â€œWhen we looked at the history of the gene that codes for the protein, we see the signature of archaic admixture in modern day Sub-Saharan African populations.â€
The research was published on July 21 in the journal Molecular Biology and Evolution. The study was led by Gokcumen and Stefan Ruhl, DDS, PhD, a professor of oral biology in UBâ€™s School of Dental Medicine.
The scientists came upon their findings while researching the purpose and origins of the MUC7 protein, which helps give spit its slimy consistency and binds to microbes, potentially helping to rid the body of disease-causing bacteria.
As part of this investigation, the team examined the MUC7 gene in more than 2,500 modern human genomes. The analysis yielded a surprise: A group of genomes from Sub-Saharan Africa had a version of the gene that was wildly different from versions found in other modern humans.
The Sub-Saharan variant was so distinctive that Neanderthal and Denisovan MUC7 genes matched more closely with those of other modern humans than the Sub-Saharan outlier did.
â€œBased on our analysis, the most plausible explanation for this extreme variation is archaic introgression â€” the introduction of genetic material from a â€˜ghostâ€™ species of ancient hominins,â€ Gokcumen says. â€œThis unknown human relative could be a species that has been discovered, such as a subspecies of Homo erectus, or an undiscovered hominin. We call it a â€˜ghostâ€™ species because we donâ€™t have the fossils.â€
Given the rate that genes mutate during the course of evolution, the team calculated that the ancestors of people who carry the Sub-Saharan MUC7 variant interbred with another ancient human species as recently as 150,000 years ago, after the two speciesâ€™ evolutionary path diverged from each other some 1.5 to 2 million years ago.
25 Jul 2017