News - Hidden Ancestry Brings Health Challenges for Native Hawaiians

Emerging research reveals that ancient migration patterns in the Pacific have left lasting genetic traces that affect the health of Native Hawaiians and other Eastern Polynesian communities today. Through whole-genome sequencing, scientists examined the DNA of numerous individuals across Polynesia, including those from Rapa Nui, Native Hawaiians, Samoans, and Tongans. They found that repeated migrations by relatively small founding groups resulted in significant 'founder effects,' which dramatically increased the frequency of certain rare genetic variants leading to inherited diseases. This effect was particularly strong compared to other populations such as the Finns, known for their distinct genetic history. The study, published in the journal Science, highlights that Hawaiian and Rapa Nui populations are genetically similar despite the vast geographical distance, likely due to ancient connections rooted in Mangareva. The health implications arise from these founder effects, where descendants inherit limited genetic diversity, raising the prevalence of specific rare variants, especially impacting isolated Eastern Polynesian populations like Hawaiʻi and Rapa Nui. The study identified three significant disease-causing founder variants common among Polynesians: an ADAMTSL4 variant causing eye lens dislocation, a PDE6B variant leading to progressive vision loss (rod-cone retinal dystrophy), and a FAN1 variant responsible for karyomegalic interstitial nephritis, a rare kidney disorder progressing to kidney failure. While these genetic conditions are extremely rare globally, they occur at higher frequencies among Eastern Polynesians studied, suggesting the need for population-specific genetic health screening. Understanding molecular genetics within Native Hawaiian populations is crucial, as mainstream genomic databases might overlook key variants affecting their health. Although historical genetic studies focus on specific conditions per population—such as Tay-Sachs disease among Ashkenazi Jews—ongoing research emphasizes the complexity of understanding Native Hawaiian health beyond mere genetic explanations. For example, a 2021 study connected Polynesian ancestry amongst Native Hawaiians to conditions like higher body mass index and increased risks of diabetes and heart failure, reflecting both genetic and non-genetic factors. To bridge these gaps, further genetic analysis involving more Native Hawaiian samples is vital to identify common rare inherited disorders. This effort is essential to improve the understanding of Native Hawaiian genetic profiles, potentially informing customized health interventions. Newsweek's editorial team consulted study co-authors Keolu Fox and Alexander Ioannidis for insights; feedback is awaited. The story has been compiled with assistance from Martyn, an AI tool aiding in research dissemination. Editorial inquiries on this study can be directed to John Fitzpatrick and James Debens at Newsweek.