Researchers at Yale University have created the largest map yet of Denisovan-inherited DNA in Near Oceanian populations, revealing thousands of ancient genetic variants that still influence gene activity in people today. The study, published on June 11, 2026, in Science, shows that DNA inherited from extinct human relatives continues to shape biology in modern populations across parts of Near Oceania.
The work focuses on Near Oceania, a region that includes New Guinea, the Bismarck Archipelago and the main Solomon Islands. These island populations carry some of the highest known levels of Denisovan ancestry in the world. Yet they have remained heavily underrepresented in genomic research.
By sequencing 177 high-coverage genomes from 12 Oceanian populations and comparing them with 1,284 genomes from around the world, the team uncovered a much richer record of ancient interbreeding than scientists had previously seen. The analysis points to three Denisovan-like ancestral groups that contributed DNA to Near Oceanians, along with a large set of inherited variants that appear to affect immune function.
Some of those variants act like dimmer switches for genes. They can raise or lower activity in biological pathways tied to immune defense, antiviral responses, development, metabolism and other functions. That makes the study a window into both ancient human migration and the living biology of people whose genomes preserve an unusually deep record of our species’ encounters with extinct relatives.
A Denisovan Legacy Written Into Modern Genomes
Denisovan DNA entered modern human populations through interbreeding tens of thousands of years ago. Denisovans were a group of extinct hominins related to Neanderthals. Their remains are sparse, yet their genetic traces have helped scientists reconstruct parts of their story.
For modern people in Oceania, that story is unusually visible. Populations in places such as Papua New Guinea can carry far more Denisovan ancestry than most people in East Asia or Europe. The Yale-led study takes that signal and examines it at a level of detail that previous work could only partly reach.
Serena Tucci, an assistant professor of anthropology at Yale and principal investigator of the Yale Human Evolutionary Genomics Laboratory, emphasized why this matters for both evolution and health. “The drastic underrepresentation of Oceanians limits our understanding of human evolution and could exacerbate health inequalities as genomic research is used to develop novel medical treatments,” Tucci said.
That underrepresentation has scientific consequences. Genomic databases have long leaned toward populations with European ancestry. When whole regions are missing or thinly sampled, researchers can miss important genetic variation. They can also form a narrower picture of human history.
Near Oceania offers a rare record of early human settlement at the edge of ancient migrations. People reached the region around 42,000 years ago, according to the study background. After that, long periods of isolation shaped distinctive genetic patterns within and among islands.
The Largest Map of Denisovan DNA Yet
The new study expanded the known map of archaic DNA in Near Oceanians. The researchers reconstructed 1.897 billion base pairs of archaic introgressed sequence. That total included 831.9 million base pairs of Denisovan sequence.
Archaic introgression is the scientific term for DNA that entered modern humans through ancient interbreeding with extinct human groups. In this case, the inherited DNA came from Denisovan-like groups and Neanderthals. The study found three times more Denisovan sequence than previous analyses had identified.
The team also reported that much of this Denisovan-inherited sequence is unique to Oceanians. That is important because a genetic variant absent from major databases can remain invisible to studies of disease risk, adaptation and human origins. A larger map gives researchers more places to look.
To build that map, the researchers used high-coverage whole-genome sequencing. High coverage means each genome is read many times, which improves confidence in the final sequence. The team then compared Oceanian genomes with worldwide genomes and with known archaic genomes.
The approach allowed them to separate recent human ancestry from older segments inherited from extinct groups. It also helped them study patterns within Near Oceania. The result is a detailed view of how island isolation, migration, population bottlenecks and archaic ancestry combined over many generations.
3,100 Variants That Change Gene Activity
More than 3,100 Denisovan-inherited variants in the study showed evidence of changing gene expression. Gene expression refers to how strongly a gene is turned on or off. Small changes in expression can affect how cells respond to stress, infection and other biological signals.
The researchers tested these variants with a massively parallel reporter assay. This method lets scientists examine thousands of genetic sequences at once to see whether they influence gene activity. It gives a functional test of DNA that might otherwise look like a historical marker alone.
Steven Reilly, an assistant professor of genetics at Yale School of Medicine and co-author of the study, described the scale of the effect. “We found thousands of archaic variants that tune genes up or down, concentrated in immune and antiviral pathways,” he said.
That finding gives the study an added layer. It shows that some inherited Denisovan variants have measurable biological effects in experiments. In other words, the ancient DNA is linked to gene regulation, including pathways that may have mattered when early humans encountered new environments and pathogens in the Pacific.
The study also identified selection signals in parts of the genome. Natural selection can increase the frequency of a variant when it helps people survive or reproduce in a given environment. The Yale team found evidence of adaptive Denisovan introgression at TRPS1, a gene involved in skeletal development.
Immune Genes With Ancient Roots
Immune-related findings are a central part of the study. The Yale announcement says the team found evidence that Denisovan-inherited genes helped ancient humans respond to microbes in Near Oceania. “We find evidence that genes inherited from Denisovans bolstered immunity to viruses and bacteria ancient humans encountered in Near Oceania,” the announcement stated.
That idea fits a broader pattern in human evolution. When modern humans moved into new regions, they encountered unfamiliar environments, foods, climates and pathogens. Extinct human groups had already lived outside Africa for long periods. Some of their DNA may have carried useful adaptations.
In Near Oceania, the researchers found functional variants concentrated in immune and antiviral pathways. These variants can alter the activity of genes involved in immune responses. Some may affect how cells detect viruses or regulate inflammation.
The study remains cautious about the exact benefits. Immune genes often have multiple roles and the same pathway can influence different processes in different tissues. A variant that helped with one pathogen in the past could have different effects in modern environments.
That uncertainty makes the functional testing especially useful. It shows that the variants can influence gene activity. Future studies can investigate which immune cells, infections, or health traits are most relevant. The current work sets up those questions with a much larger genetic map.
Three Denisovan Lineages in Near Oceania
The study found evidence for DNA from three Denisovan-like groups in Near Oceanians. That result adds complexity to the story of ancient interbreeding. It suggests that the Denisovan ancestry in these populations came from more than one source population.
Denisovans are known mainly through ancient DNA from a small number of fossils. Because of that, modern genomes are valuable archives. They can preserve traces of extinct groups that left few bones behind. Near Oceanian genomes appear to hold one of the richest records of Denisovan diversity.
Patrick F. Reilly and colleagues also examined how these inherited segments vary across Oceanian populations. The study describes a gradient of genetic similarity across groups, along with signs of long-term isolation in some Papuan-speaking populations. These patterns reflect geography, settlement history and the effects of small population sizes over time.
Population bottlenecks are part of that history. A bottleneck occurs when a population passes through a period with fewer ancestors contributing to later generations. This can make genetic drift stronger and create sharper differences among groups.
The Denisovan lineages in the study also point to a deeper mystery. Scientists still have limited fossil evidence for where different Denisovan groups lived, how many there were and how they interacted with modern humans. Genomes from Oceania help fill that gap by preserving ancient ancestry in living populations.
What Oceanian Genomes Reveal About Human Evolution
Oceanian genomes are central to a fuller account of human evolution. The new Science study shows that Near Oceanian populations hold genetic information that has been missed by many global datasets. Their genomes record ancient isolation, later contacts and unusually high levels of Denisovan ancestry.
The findings also connect evolution with modern biomedical research. If genomic medicine relies on incomplete datasets, it can miss variants that matter in underrepresented populations. Tucci’s comment highlights the health dimension of this work. Representation in genomic research affects what scientists can learn and who may benefit from future discoveries.
The study does not claim that Denisovan DNA determines modern immunity in a simple way. Biology rarely works through one ancient variant or one direct pathway. The results show that thousands of Denisovan-inherited variants can influence gene activity, especially in immune and antiviral systems.
For readers, the larger point is clear. Human evolution continues to leave detectable marks inside living cells. DNA inherited from extinct relatives can still help regulate genes tens of thousands of years after interbreeding occurred.
The next steps will likely involve more population sampling, more functional testing and careful partnerships with Oceanian communities. Each new genome can sharpen the map. Each functional experiment can help distinguish inherited history from biology that still affects people today.
