Hawai'ian outrigger (Holopuni) canoe
Human history is written in more than ancient texts. It is also preserved in the genetic material passed from generation to generation, where migrations and changes in population size leave patterns that scientists can investigate. For creationists who would compress humanity’s ancestry into the descendants of a single family emerging from a mythical global flood, this presents a demanding test: their story must explain the actual distribution of genetic variation, rather than merely assert that people dispersed.
A new study published in Science on 8 October 2026 examines whole-genome sequences from 1,050 Polynesian people. It reveals successive founder effects associated with the settlement of Pacific islands: small founding groups carried only part of their source population’s genetic diversity, and subsequent departures repeated that sampling process.
The result is a nested pattern of inheritance. Particularly striking is the close genetic relationship between the populations of Hawaiʻi and Rapa Nui, despite their separation by roughly 7,000 kilometres. The researchers interpret this as evidence that both populations have deeper ancestral roots in Mangareva. Their reconstruction also involves repeated movement between islands, rather than a simple procession of isolated, one-way journeys.
These demographic events have medical consequences too. Variants that were rare in an ancestral population can become relatively common among descendants of a small founding group. The study identifies several disease-associated variants at elevated frequencies, showing how the legacy of settlement can remain relevant to health today.
This is also an accessible example of why evolution cannot be reduced to natural selection alone. Genetic drift — chance changes in the frequencies of genetic variants — can shape populations without making them better adapted. A variant does not have to be beneficial to become more common; sometimes its frequency reflects who happened to found a community and which descendants subsequently reproduced. The voyages were purposeful human achievements, but their genetic consequences required neither foresight nor a designer.
The challenge for biblical literalism is therefore more substantial than finding room for Polynesian voyagers somewhere after Noah. A scientific explanation must account for which populations share particular variants, how those variants are distributed, and which demographic history best explains the pattern. These findings do not, by themselves, constitute a test of every claim about a global flood. They do demonstrate what an evidence-based account of human dispersal looks like: a reconstruction open to scrutiny and revision, with consequences that can be checked against independent evidence. Simply invoking Genesis supplies none of that explanatory detail.
Founder Effects, Genetic Drift and Biodiversity. Evolution is a change in the inherited characteristics of populations over generations. Natural selection is one mechanism that produces such change, but it is not the only one. Genetic drift changes the frequencies of genetic variants through chance, while the founder effect is a particular example of that process.The paper in Science was accompanied by a UC San Diego news release:
What is genetic drift?
Each generation inherits only a sample of the genetic variation present in the previous generation. By chance, some individuals leave more offspring than others, and some variants are passed on more often. Consequently, a variant can become more common, disappear, or reach fixation — when every copy of a particular gene or DNA region in the population carries that variant — without providing any advantage.
Drift occurs in all finite populations, but its effects are generally stronger in small populations. Imagine tossing a coin ten times: obtaining seven heads would not be particularly surprising. Across ten thousand tosses, however, the proportion of heads will usually be much closer to half. Similarly, smaller populations are more susceptible to large proportional fluctuations in the variants inherited by the next generation.
What is the founder effect?
When a few individuals establish a new population, they carry only a sample of the source population’s genetic diversity. That sample may be unrepresentative: a rare variant might be carried by several founders, while a common one might be absent altogether.
For example, suppose a variant occurs in just one per cent of the gene copies in a large population. If one of ten diploid founders carries a single copy, its initial frequency in the new population would be five per cent — one copy among twenty. No advantage or new mutation is needed to produce that difference.
If descendants subsequently establish another population, the sampling process happens again. Successive settlements can therefore produce serial founder effects, leaving a nested pattern of shared ancestry and reduced genetic diversity. Later migration can modify that pattern by introducing additional variants.
How do these processes contribute to biodiversity?
Chance does not mean “anything goes”
- They make populations genetically different. Separate populations can lose or retain different variants, even when their environments are similar.
- They alter the material available to natural selection. Selection acts on the inherited variation present locally; founders may carry a different selection of variants from those remaining in the source population.
- They can contribute to divergence between isolated populations. Alongside mutation and natural selection, drift can help populations follow different evolutionary trajectories. If reproductive barriers eventually develop, this divergence can contribute to speciation. A founder event does not automatically produce a new species.
- They can reduce diversity within populations. This is an important distinction: increasing genetic differences between populations can accompany declining genetic variation within each population. Reduced variation can also limit future adaptive responses.
Drift is random with respect to whether a variant is useful, but its effects follow measurable statistical patterns. Population size, migration and reproductive history all influence its strength. Natural selection and drift operate together: a mildly harmful variant may become more common by chance, especially in a small population, while selection generally acts more effectively against strongly harmful variants.
Founder effects and drift do not themselves create new genetic variants. Mutation supplies new variants, while recombination reshuffles existing ones. Drift changes their frequencies, and gene flow moves them between populations. Together with natural selection, these processes explain how populations evolve and diversify without any need for foresight or a predetermined goal.
Polynesian Wayfinding Is Written in the Genomes of Island Populations
UC San Diego research reveals how Polynesian seafaring shaped the genomes of island populations, offering new clues to health risks and medical discoveries in rarely studied communities
For centuries, Polynesian navigators crossed thousands of miles of open ocean, using their knowledge of stars, currents, birds, clouds and the sea to settle islands across the Pacific. Now, a new University of California San Diego study shows the history of voyaging is also reflected in the genomes of Polynesian populations today.
Published Oct. 8 in Science and featured on the journal’s cover, the study analyzes whole-genome sequences from 1,050 individuals across Polynesia. The findings offer genomic evidence of the extraordinary skill, knowledge and achievement of Polynesian voyagers, whose mastery of long-distance ocean travel helped shape the genetic history of the Pacific.
Using DNA to trace how Polynesian communities were formed, the study also shows that the same migration history may help explain why certain health-related genetic variants are more common in some island populations.
As Polynesian voyagers left established island communities to settle new ones, each group carried only a portion of the genetic diversity found in the population it left behind. For example, a group departing Mangareva for Hawaiʻi or Rapa Nui would have carried only a smaller genetic selection of the people living in Mangareva. When later groups set out from newly settled islands, they carried an even smaller subset of that genetic variation with them.
The authors compare the pattern to a set of Russian nesting dolls: The largest population contains the most genetic variation, while each successive population contains a smaller genetic subset within it.
As we go from one island to the next, we're selecting a subset of a gene pool, and that is shaping our genome over time.
Associate Professor Keolu Fox, corresponding author
Department of Anthropology
University of California, San Diego
La Jolla, CA, USA.
Reconstructing a history of voyaging
The study examined genomic data from populations in French Polynesia, including the Austral, Society, Marquesas and Tuamotu islands, as well as Mangareva. The researchers also incorporated data from Rapa Nui, Native Hawaiians, Samoans and Tongans.
The analysis found that Hawaiʻi and Rapa Nu i — two of the most geographically distant Polynesian populations — are also the most closely genetically related among the remote island populations studied.
The islands are separated by approximately 7,000 kilometers and each is more than 3,000 kilometers from the nearest inhabited Polynesian island. The researchers say their genetic similarities suggest that both populations were ultimately settled by voyagers whose deeper ancestral roots trace back to Mangareva.
The findings support the existence of an ancient culture capable of repeated, long-distance voyaging across the Pacific. The researchers refer to this hypothesized tradition as Holomoana Nui, meaning “great ocean voyaging.”
The pattern was not created by a single, one-way migration. Polynesian voyaging involved repeated movement among island populations, with voyagers carrying provisions, knowledge and genetic material across the ocean. Over time, the repeated settlement of new islands produced increasingly concentrated founder effects.
In Polynesia, the researchers found evidence of multiple founder effects — when small groups establish new populations, carrying only a portion of the genetic diversity of the larger population they left behind. They also discovered bottlenecks — when disease or another major event sharply reduces a population, leaving survivors with less genetic variation than before — accumulating over the course of settlement. The result is one of the strongest cumulative founder effects observed in human population genetics.
What the findings could mean for health
Founder effects can influence health because rare genetic variants carried by a small founding population may become more common in later generations.
The researchers identified three variants associated with autosomal recessive diseases at relatively high frequencies in French Polynesia. One variant in the FAN1 gene, associated with karyomegalic interstitial nephritis — a rare condition that can lead to kidney failure — was found in more than 11% of the French Polynesian cohort. The variant was absent from gnomAD, a major international database containing genomic data from more than 800,000 individuals.
The findings demonstrate how medically important variants can be common within a specific founder population while remaining invisible in large global genomic databases.
That gap matters because much of modern genomic medicine has been developed using data from populations of European ancestry. Without more detailed information about Polynesian populations, clinicians may not know which variants to screen for or how frequently certain disease-associated variants occur.
The study also underscores why broad population categories can be inadequate for clinical genetics. Grouping Native Hawaiian and Pacific Islander populations together may obscure important differences among individual island populations.
Fox said the findings could eventually help researchers develop more precise approaches to screening, diagnosis and treatment, including for diseases such as cancer.
The study itself does not establish new clinical guidelines or treatments. Rather, it identifies genetic information that could guide future research and clinical work.
A study designed around trust
Fox, who is the first Native Hawaiian to earn a Ph.D. in Genome Sciences, has a longstanding interest in Polynesian history and the health needs of Pacific Islander communities.
During a 2017 visit to French Polynesia, a conversation about the legacy of French nuclear testing led Fox to consider how genomic research might help clarify disease risks in communities exposed to environmental hazards and underserved by modern medical infrastructure.
The French government conducted 193 nuclear tests in French Polynesia between 1966 and 1996. Fox said the experience prompted him to think more deeply about how precision medicine could serve communities that have not always had access to comprehensive cancer screening, genetic testing or specialized care.
But the study was also shaped by a second question: How could the research be conducted in a way that protected Indigenous communities and allowed them to share in the benefits of scientific discovery?
The answer became Variant Bio, a biotechnology company that Fox joined as a senior advisor while conducting the research. It develops partnerships with populations that have historically been underrepresented in genomic research. He said the company was created to give participating communities greater control over how their data are collected, stored and used.
We want to build trust first. Making you a partner and not a subject in this allows us to expedite the development of these projects.
Associate Professor Keolu Fox.
That approach treats community members as partners in research rather than simply as sources of biological material. It includes explaining the potential uses and risks of genomic data, building relationships with community leaders and involving local health professionals in the research process.
The study includes contributions from Indigenous and Pacific Islander communities in Hawaiʻi, Rapa Nui and French Polynesia. Its authors also acknowledge the French Polynesian clinicians, nurses and community health workers who helped make the research possible.
Fox said the inclusion of local clinicians reflects a central principle of the project: The people who understand the health needs of a community should be involved in research conducted there.
None of this is possible without the contributions of these partners.
Associate Professor Keolu Fox.
Sharing in the benefits
Variant Bio’s model includes a formal benefit-sharing commitment of 4% of the company’s revenue and 4% of equity-derived value that are designated for partner communities.
The arrangement is intended to ensure that communities contributing genetic data share in the value created by research and future commercial partnerships. The funds can support priorities identified by the communities themselves, including health care, education, infrastructure, food sovereignty, energy projects and data infrastructure.
For Fox, benefit-sharing is not separate from the science. It is part of the research design.
If you want to recruit communities into research, you have to make them stakeholders in the technology you are building.
Associate Professor Keolu Fox.
Fox, who spent nearly a decade on the research endeavor, says the paper in Science reflects a broader vision for the future of genomic medicine — one in which Indigenous communities help shape the research questions, govern the use of their data and participate in the benefits of discoveries made from their genomes.
It is remarkable to say that our achievements as voyaging people have shaped our genomes over time. And to have that recognized on the cover of Science is incredibly validating.
Associate Professor Keolu Fox.
Publication:
What emerges from this research is a history of human achievement recorded in living genomes. Polynesian voyagers carried more than people, provisions and knowledge across the Pacific: they carried samples of their ancestral populations’ genetic diversity. Successive settlements, continued contact and the chance events of inheritance left patterns that researchers can now use to reconstruct aspects of those journeys.
For creationists, the difficulty is explaining that detail. Simply declaring that everyone descended from Noah’s family does not explain the nested founder effects or the particular genetic relationships between island populations. Any proposed alternative must account for the same evidence and withstand the same tests. This study does not, on its own, disprove every version of a Flood narrative, but it illustrates the explanatory substance that such narratives lack.
The findings also expose the mistake of treating evolution as a process that must always produce improvement. Genetic drift can increase the frequency of a harmful variant just as it can eliminate a potentially useful one. There is no foresight in that process, no guarantee of better health, and no requirement for a guiding intelligence. The voyagers had intentions; the genetic consequences of their journeys did not.
Science can therefore do more than reconstruct the past: it can help explain why that past still matters to the health of communities today. Its conclusions remain open to revision as evidence accumulates. That willingness to test and revise an explanation is precisely what gives it value — and what distinguishes a developing account of human history from a story whose conclusion was fixed before the evidence was examined.
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