In a new study, researchers with the help of the SciLifeLab SNP&SEQ Technology Platform unveil a complex history of modern and archaic humans in the Asia-Pacific region and identify the Ayta Magbukon as the ethnic group with the highest level of Denisovan ancestry.
Researchers have known from several lines of evidence that the ancient hominins known as the Denisovans interbred with modern humans in the distant past. In a new study, published in Current Biology, researchers have discovered that the Philippine Negrito ethnic group known as the Ayta Magbukon have the highest level of Denisovan ancestry in the world. In fact, they carry considerably more Denisovan DNA than the Papuan Highlanders, who were previously known as the present-day population with the highest level of Denisovan ancestry.
“We made this observation despite the fact that Philippine Negritos were recently admixed with East Asian-related groups—who carry little Denisovan ancestry, and which consequently diluted their levels of Denisovan ancestry. If we account for and masked away the East Asian-related ancestry in Philippine Negritos, their Denisovan ancestry can be up to 46 percent greater than that of Australians and Papuans” says first author Maximilian Larena of Uppsala University.
Larena and colleagues, including Mattias Jakobsson, last author and Director of the SciLifeLab Ancient DNA unit, aimed to establish the demographic history of the Philippines. Through a partnership between Uppsala University and the National Commission for Culture and the Arts of the Philippines (NCCA), aided by collaboration with indigenous cultural communities, local universities, local government units, non-governmental organizations and regional offices of the National Commission for Indigenous Peoples, they analyzed about 2.3 million genotypes from 118 ethnic groups of the Philippines including diverse self-identified Negrito populations. The sample also included high-coverage genomes of Australo-Papuans and Ayta Magbukon Negritos.
The study shows that Ayta Magbukon possesses the highest level of Denisovan ancestry in the world, consistent with an independent admixture event into Negritos from Denisovans. Together with the recent discovery of a small-bodied hominin called Homo luzonensis, the data suggest that there were multiple archaic species that inhabited the Philippines prior to the arrival of modern humans, and that these archaic groups may have been genetically related.
Altogether, the researchers say that the findings unveil a complex intertwined history of modern and archaic humans in the Asia-Pacific region, where distinct Islander Denisovan populations differentially admixed with incoming Australasians across multiple locations and at various points in time.
“This admixture led to variable levels of Denisovan ancestry in the genomes of Philippine Negritos and Papuans. In Island Southeast Asia, Philippine Negritos later admixed with East Asian migrants who possess little Denisovan ancestry, which subsequently diluted their archaic ancestry. Some groups, though, such as the Ayta Magbukon, minimally admixed with the more recent incoming migrants. For this reason, the Ayta Magbukon retained most of their inherited archaic tracts and were left with the highest level of Denisovan ancestry in the world” says Mattias Jakobsson.
“By sequencing more genomes in the future, we will have better resolution in addressing multiple questions, including how the inherited archaic tracts influenced our biology and how it contributed to our adaptation as a species” says Maximilian Larena.
This text is based on a press release from Cell Press. Read the publication in its entirety to learn more.