An analysis of the genomes of nearly 6,000 Greenlandic people has provided new insights into how centuries of isolation have shaped the genetic profile of Greenlanders. Published on February 12, 2025, in Nature, the study shows that Greenland’s relatively small, isolated population has led to a unique genetic make-up, with some Arctic-specific gene variants linked to both health adaptations and genetic diseases.
The research, which sequenced the DNA of around 14% of Greenland’s adult population, reveals that Greenland’s original inhabitants—who arrived from Siberia via North America approximately 1,000 years ago—settled and remained largely isolated in specific regions of the island. According to Anders Koch, a senior physician at Queen Ingrid’s Hospital in Nuuk, the study offers “new insights” into how genetic knowledge can improve health care for Arctic populations, highlighting the importance of understanding the specific genetic traits that are prevalent in small, Indigenous groups.
Historically, small Indigenous populations like those in Greenland have been underrepresented in genetics research, which has largely focused on individuals of European descent. However, this groundbreaking study of Greenlandic genetics, led by Koch and a team of international researchers, provides a detailed picture of how living in the Arctic environment has shaped the genetic traits of the people who have lived there for centuries.
The study shows that the Greenlandic population is largely descended from a small founding group—fewer than 300 individuals—who settled on the island after migrating from Siberia. Once established, these settlers and their descendants did not frequently travel across the island but instead remained in relatively isolated communities, leading to a concentration of certain genetic traits and variants. Some of these traits appear to be adaptations to the Arctic lifestyle, such as a genetic variation that helps to metabolize fatty acids, which is likely linked to the traditional Greenlandic diet, rich in omega-3 fatty acids from seal and whale meat.
However, the isolation also had a downside. The study found that because of the limited gene pool, some recessive genetic conditions have become more common in Greenland, including a rare liver disease called cholestasis familiaris groenlandica (CFG), which is most prevalent in eastern Greenland. The disease is caused by a recessive mutation in a single gene, and it highlights the challenges faced by isolated populations, where such genetic conditions can remain hidden in carriers until they are passed down to children.
In response to this, Greenland now screens pregnant individuals for the CFG variant, a preventive measure that ensures better health outcomes for future generations. Koch emphasized that while screening for this disease would be of little use in places like Denmark, it is crucial in Greenland due to the prevalence of the condition within the population. This approach to health care underscores the potential benefits of tailoring medical practices to the specific genetic traits of isolated populations.
The study also notes that since the 1960s, there has been a trend of Greenlanders migrating from rural areas to urban centers, which could help reduce the incidence of diseases linked to isolated gene pools, such as CFG. These “mini-migrations” might contribute to greater genetic diversity within the population over time, potentially reducing the occurrence of such recessive genetic conditions.
This study not only enhances our understanding of Greenlandic genetics but also provides valuable insights into how genetic research can be used to improve health outcomes for small, isolated populations. By understanding the unique genetic makeup of these populations, researchers can develop more effective strategies for diagnosing, preventing, and treating genetic diseases, ultimately improving the quality of life for individuals in the Arctic and beyond.
