The people of Near Oceania have a genetic history that dates back nearly 42,000 years, highlighting one of the earliest human expansions into the Pacific. A recent study reveals significant details about their genetic legacy, including a wealth of Denisovan DNA. Researchers discovered that the ancestors of today’s Oceanians interbred with at least three different Denisovan-like groups, indicating a complex web of ancient interactions.
Around 42,000 years ago, humans reached what is now New Guinea, the Bismarck Archipelago, and the Solomon Islands. For thousands of years, these communities were isolated by sea and mountains, which limited their movement. This isolation led to the development of multiple languages, while, within their DNA, remnants of extinct human relatives persisted.
The study, published in Science, analysed 177 genomes from various Near Oceanian populations. This research found that these genomes contain some of the highest levels of archaic DNA globally, with Oceanians possessing about 2.5 times more than Europeans and significantly more Denisovan DNA than East Asians.
Denisovans, relatives of Neanderthals, are known primarily through genetic evidence rather than extensive fossils. The new findings suggest that Near Oceanians inherited gene sequences from multiple Denisovan-like populations, expanding our understanding of genetic interaction between ancient humans.
The implications of this study are numerous. It reveals that our ancestors did not merely replace their predecessors but intermingled with them. This interconnected history can also influence medical research, as current biobanks often overlook Oceanian genetic diversity, potentially missing important health-related variants.
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