Massive primate genome panel spans 269 species and rewrites the rules of comparison

Primates are, by almost any measure you care to choose, an extraordinary group of mammals. From the mouse lemurs of Madagascar, small enough to fit in a human palm, to the mountain gorillas of Central Africa, the order encompasses hundreds of species that occupy rainforest canopies, savannas, mountain slopes, and mangrove swamps. That ecological and phylogenetic breadth is precisely what makes primates so valuable to science: they are our closest evolutionary relatives, and their genomes hold clues to how humans came to be, how new species arise, and how populations respond to a shrinking world. Yet for all the sequencing effort that has poured into primate biology over the past two decades, the field has been hampered by a deceptively mundane problem. The thousands of whole-genome sequences that exist across primate taxa were processed in inconsistent ways, making it difficult, and sometimes impossible, to compare them meaningfully at scale.

A team of researchers at Aarhus University in Denmark has now tackled that problem head-on. In a study published in Genome Biology, Vasili Pankratov, Bjarke Meyer Pedersen, Juraj Bergman, and colleagues present a curated genome-scale nucleotide diversity panel built from publicly available short-read sequencing data covering 3,240 individual non-human primates. The panel spans 269 species across 71 genera, a coverage of primate diversity that dwarfs most previous comparative resources. Rather than generating new sequence data, the team’s achievement lies in harmonization: they took existing raw reads, reprocessed them through a single, rigorous analytical pipeline, and produced variant calls that can be compared across species without the artifacts that have plagued earlier efforts.

The technical heart of the work is a ploidy-aware variant calling procedure. This may sound like an arcane detail, but it addresses one of the most stubborn sources of error in comparative genomics. Most primate genomes, like the human genome, are diploid, carrying two copies of each autosome. But sex chromosomes break that symmetry. Males carry a single X chromosome and a single Y chromosome, while females carry two X chromosomes. If variant calling software assumes diploidy everywhere, as many standard pipelines implicitly do, it systematically misinterprets the genetic variation in these haploid regions. Calls on the X and Y chromosomes of males get distorted, heterozygosity estimates go awry, and any downstream analysis of sex-linked variation inherits the error. Because sex chromosome evolution is a major theme in primate research, this was not a corner of the genome the field could afford to ignore.

By explicitly modeling ploidy across autosomes and sex chromosomes, the Aarhus team ensured that nucleotide diversity estimates are accurate in every region of the genome, including the ones where previous datasets were least reliable. The result is a panel in which a measure of genetic diversity calculated for a lemur on Madagascar is directly comparable to the same measure for a macaque in Asia or a marmoset in South America. That kind of apples-to-apples comparability is what transforms a collection of sequences into a genuine scientific resource. It allows researchers to ask questions about hundreds of species at once rather than piecing together answers from studies that each used their own methods.

The scale of the resource opens doors that were previously closed. Nucleotide diversity, the raw currency of population genetics, reflects the amount of genetic variation carried within a population. It is shaped by mutation rates, population size, natural selection, and demographic history, and comparing it across species reveals how these forces play out over evolutionary time. With 269 species represented, researchers can now examine how diversity varies across the primate tree of life, testing long-standing hypotheses about why some lineages are genetically depauperate while others brim with variation. Species with small geographic ranges or small population sizes, for instance, are expected to carry less diversity, and the panel provides the data to quantify those patterns systematically rather than anecdotally.

Conservation biology stands to benefit immediately. Many primate species are threatened with extinction, and genetic diversity is a key indicator of a population’s long-term viability: low diversity signals inbreeding, reduced adaptive potential, and elevated extinction risk. A curated panel that places every species on a common footing allows conservation geneticists to benchmark the diversity of an endangered primate against its relatives, identifying which populations are most genetically compromised and where limited conservation resources might do the most good. Because the underlying data are publicly available short reads, the panel can be updated as new genomes are sequenced, making it a living resource rather than a static snapshot.

The study also contributes a second, complementary resource: a multiple-genome alignment of the primate assemblies used for variant calling. Aligning genomes across species is one of the hardest problems in computational biology, because genomes differ not only in their sequences but in their structure, with rearrangements, duplications, insertions, and deletions accumulated over tens of millions of years of divergence. A well-constructed multiple alignment allows researchers to trace how individual stretches of DNA have changed across the order, to identify regions conserved under purifying selection, and to pinpoint loci where selection has driven rapid change. Combined with the diversity panel, the alignment enables cross-species comparisons at both the population level and the genome structure level, two views that are most powerful when used together.

Sex chromosome evolution is one area where the authors explicitly expect the resource to pay dividends. The X and Y chromosomes have peculiar evolutionary dynamics: the Y is haploid, passed only from father to son, and largely sheltered from recombination, while the X spends two-thirds of its time in females and is exposed to selection in hemizygous males. These features make sex chromosomes hotspots of unusual evolutionary patterns, and testing hypotheses about them requires diversity estimates that are computed correctly in haploid and diploid contexts alike. The ploidy-aware pipeline makes the panel one of the few resources where such analyses can be conducted across dozens of primate genera with confidence that the numbers mean what they appear to mean.

The computational effort behind the project was substantial. All analyses were performed on the GenomeDK cluster operated by Aarhus University, and the team acknowledges the data management support that made the resulting resource available for download. The work received no dedicated external funding, a detail that underscores how much of modern genomics is built on the clever reuse of existing data. Thousands of primate genomes had already been sequenced by consortia and individual labs around the world; what was missing was the curation layer that turns scattered datasets into a coherent whole. The Aarhus study demonstrates that the bottleneck in comparative genomics is often not sequencing capacity but analytical consistency.

For the broader research community, the panel arrives at a moment of growing ambition in primate genomics. Large-scale efforts to sequence the tree of life, together with rapidly improving reference assemblies, have made it realistic to contemplate evolutionary analyses that span the entire order. Resources like this one provide the substrate for those analyses: a harmonized set of variant calls, a genome alignment, and a framework that future datasets can be folded into. Whether the questions concern the genetic basis of speciation, the demographic history of endangered apes, or the deep evolutionary forces that shaped the human genome, the answer will increasingly be sought in resources of exactly this kind. The primate diversity panel is, in that sense, less a conclusion than an invitation, an open door to hundreds of species whose genomes have finally been placed on common ground.

Subject of Research: A genome-scale nucleotide diversity panel of non-human primates spanning 269 species

Article Title: A curated genome-scale nucleotide diversity panel of non-human primates

Article References: Pankratov, V., Pedersen, B. M., Sørensen, E. F., Munch, K., Bataillon, T., Schierup, M. H., & Bergman, J. (2026). A curated genome-scale nucleotide diversity panel of non-human primates. Genome Biology. https://doi.org/10.1186/s13059-026-04286-6

Image Credits: AI Generated

DOI: 10.1186/s13059-026-04286-6

Keywords: primates, genomics, nucleotide diversity, variant calling, sex chromosomes, comparative genomics, conservation genetics, genome alignment, population genetics, Genome Biology, Aarhus University, speciation