PDA

View Full Version : DNA Mapping of The Philippines



ATjunior1
04-08-2021, 08:46 PM
https://www.pnas.org/content/118/13/e2026132118
The Largest-ever DNA mapping study of the Philippines by Uppsala University, Sweden.

okarinaofsteiner
04-12-2021, 11:30 PM
Significance
A key link to understand human history in Island Southeast Asia is the Philippine archipelago and its poorly investigated genetic diversity. We analyzed the most comprehensive set of population-genomic data for the Philippines: 1,028 individuals covering 115 indigenous communities. We demonstrate that the Philippines were populated by at least five waves of human migration. The Cordillerans migrated into the Philippines prior to the arrival of rice agriculture, where some remain as the least admixed East Asians carrying an ancestry shared by all Austronesian-speaking populations, thereby challenging an exclusive out-of-Taiwan model of joint farming–language–people dispersal. Altogether, our findings portray the Philippines as a crucial gateway, with a multilayered history, that ultimately changed the genetic landscape of the Asia-Pacific region.

Abstract
Island Southeast Asia has recently produced several surprises regarding human history, but the region’s complex demography remains poorly understood. Here, we report ∼2.3 million genotypes from 1,028 individuals representing 115 indigenous Philippine populations and genome-sequence data from two ∼8,000-y-old individuals from Liangdao in the Taiwan Strait. We show that the Philippine islands were populated by at least five waves of human migration: initially by Northern and Southern Negritos (distantly related to Australian and Papuan groups), followed by Manobo, Sama, Papuan, and Cordilleran-related populations. The ancestors of Cordillerans diverged from indigenous peoples of Taiwan at least ∼8,000 y ago, prior to the arrival of paddy field rice agriculture in the Philippines ∼2,500 y ago, where some of their descendants remain to be the least admixed East Asian groups carrying an ancestry shared by all Austronesian-speaking populations. These observations contradict an exclusive “out-of-Taiwan” model of farming–language–people dispersal within the last four millennia for the Philippines and Island Southeast Asia. Sama-related ethnic groups of southwestern Philippines additionally experienced some minimal South Asian gene flow starting ∼1,000 y ago. Lastly, only a few lowlanders, accounting for <1% of all individuals, presented a low level of West Eurasian admixture, indicating a limited genetic legacy of Spanish colonization in the Philippines. Altogether, our findings reveal a multilayered history of the Philippines, which served as a crucial gateway for the movement of people that ultimately changed the genetic landscape of the Asia-Pacific region.

So the 5 "ancestry" groups are basically Cordilleran (Austronesian proper), 3 Negrito groups that cluster with each other, and 1 outgroup "southern" Negrito population (Mamanwa) that's more closely related to Papuans?

Or am I reading this wrong, and the other ancestry groups are also the South Asian ancestry among Sama, low-level West Eurasian (Euro) ancestry, and low-to-medium level South Chinese ancestry from the colonial era?

https://www.pnas.org/content/pnas/118/13/e2026132118/F2.large.jpg?width=800

Interesting how Cordilleran = "Basal" Austronesian minus "NE Asian"-like ancestry found in Amis and Dai?