Largest Denisovan DNA study reveals ancient genes still active in Oceanian populations
Ancient Denisovan DNA continues to influence the immune systems and skeletal development of modern populations in Near Oceania, according to a study published in Science. Researchers from Yale University found that residents of Papua New Guinea and surrounding islands carry significantly higher levels of Denisovan-derived genetic material than any other global population, with some individuals showing up to 5% ancestry from this extinct human group.
How Denisovan DNA Impacts Modern Immunity
The study, led by researchers including P.F. Reilly and S. Tucci, identified 3,127 functional Denisovan-derived genetic variants that remain active in living people. These segments act as biological switches, modulating the activity of genes involved in the interferon-gamma signaling pathway. According to the research, this pathway is critical for the human immune response to bacteria, viruses, and other pathogens. By inheriting these specific segments, modern Oceanian populations may have gained an evolutionary advantage in resisting environmental pressures encountered as their ancestors migrated across the Pacific.
While people in Papua New Guinea carry up to 5% Denisovan ancestry, populations in East Asia typically carry only about 0.1%. This suggests that interbreeding between modern humans and Denisovans occurred at different intensities across varying geographic regions.
Why Near Oceania Is Critical for Genetic Research
Genetic research has historically been skewed toward European populations, creating a significant knowledge gap in human history and medical health. By sequencing the genomes of 177 people across 12 distinct populations in Near Oceania, the Yale-led team established a catalog of Denisovan-derived sequences three times larger than previous datasets. This effort highlights that over 70% of these newly identified sequences are unique to Oceanian populations. Expanding genomic databases to include these groups is essential for understanding how ancient interbreeding shapes modern physiological traits, including metabolism and fertility.
What Are the Long-Term Evolutionary Consequences?
Natural selection has favored specific Denisovan variants over at least 45,000 years of human history in the Pacific. One notable example is the TRPS1 gene, which influences bone growth and skeletal formation. According to the research team, this gene has undergone strong positive selection not only in Oceania but also among rainforest hunter-gatherers in Central Africa and highland populations in Ecuador. This pattern indicates that ancient genetic “switches” are repurposed by natural selection across diverse environments to solve similar biological challenges.
Frequently Asked Questions
- Who were the Denisovans? Denisovans were an extinct group of ancient human relatives known to science primarily through fossil remains and DNA evidence recovered from caves.
- How much Denisovan DNA do modern humans have? It varies by region; while many East Asians carry about 0.1%, some populations in Papua New Guinea possess as much as 5% Denisovan ancestry.
- Does this ancient DNA still work? Yes. The study confirmed that thousands of Denisovan-derived variants continue to influence gene activity, specifically regarding immune system function and skeletal development.
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