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7 novembre 2022
- handle: 10670/1.etymab
- hal: hal-03885644
- doi: 10.1016/j.cub.2022.08.055
- PUBMED: 36108636
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cub.2022.08.055
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info:eu-repo/semantics/altIdentifier/pmid/36108636
http://creativecommons.org/licenses/by-nc-nd/ , info:eu-repo/semantics/OpenAccess
Mots-clés
Vanuatu Remote Oceania Melanesians Papuans ancient DNA Pacific migrations Polynesian outliers diversification language contact -bio]/Genetics/Populations and Evolution [q-bio.PE]Sujets proches
Inheritance (Biology) Pangenesis Ancestry Descent Genealogy--Handbooks, manuals, etc Genealogical research Family trees Genealogy--Sources Genealogy--History Family history (Genealogy) Genealogy--Research Ancestry Descent Pedigrees Genealogy--Methodology Vanuatuans Biography--Ancestry Relations with family Biography--Descendants Biography--Family AncestryCiter ce document
Lara R. Arauna et al., « The genomic landscape of contemporary western Remote Oceanians », HAL-SHS : archéologie, ID : 10.1016/j.cub.2022.08.055
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Résumé
The Vanuatu archipelago served as a gateway to Remote Oceania during one of the most extensive human migrations to uninhabited lands 3,000 years ago. Ancient DNA studies suggest an initial settlement by East Asian-related peoples that was quickly followed by the arrival of Papuan-related populations, leading to a major population turnover. Yet there is uncertainty over the population processes and the sociocultural factors that have shaped the genomic diversity of ni-Vanuatu, who present nowadays among the world's highest linguistic and cultural diversity. Here, we report new genome-wide data for 1,433 contemporary ni-Vanuatu from 29 different islands, including 287 couples. We find that ni-Vanuatu derive their East Asian-and Papuanrelated ancestry from the same source populations and descend from relatively synchronous, sex-biased admixture events that occurred 1,700-2,300 years ago, indicating a peopling history common to the whole archipelago. However, East Asian-related ancestry proportions differ markedly across islands, suggesting that the Papuan-related population turnover was geographically uneven. Furthermore, we detect Polynesian ancestry arriving 600-1,000 years ago to Central and South Vanuatu in both Polynesian-speaking and non-Polynesian-speaking populations. Last, we provide evidence for a tendency of spouses to carry similar genetic ancestry, when accounting for relatedness avoidance. The signal is not driven by strong genetic effects of specific loci or trait-associated variants, suggesting that it results instead from social assortative mating. Altogether, our findings provide an insight into both the genetic history of ni-Vanuatu populations and how sociocultural processes have shaped the diversity of their genomes.