[Explainer] The Austronesian Voyagers: How a mtDNA “Polynesian Motif” Linked Half the Globe

This is a popular-science synthesis, based on the DNAGENICS spotlight review of 267 archaeological samples spanning roughly 6378 BCE to 1950 CE; it is not primary research.

Several thousand years ago, speakers of Austronesian languages set out from Taiwan, island-hopped through Southeast Asia, and reached Remote Oceania — one of the most remarkable maritime expansions in prehistory. Maternal mitochondrial DNA carries a clear signature of this voyage: haplogroups such as E2a and B4a1a1, known collectively as the “Polynesian motif.” On the paternal side, the story is tied to the O-series Y-chromosome haplogroups.

Set the new ancient-genome results from Palau side by side with sequence data from Vanuatu and Fiji, and a striking contrast emerges. Palau’s first settlers were already admixed — East Asian and Papuan — before they arrived. On many other islands, people seem to have settled first and mixed with Papuan-related groups only later. Along a single expansion route, the timing of admixture differed from archipelago to archipelago.

Thanks to these molecular markers, researchers can trace the routes and mixing rhythms of ancient seafarers at the genetic level, rather than only by comparing pottery — a maritime epic written in DNA.

Source: DNAGENICS. Voyagers of Ocean: The Austronesian Reach.