Mobile stretches of DNA called transposable elements may help explain why ants diversified so rapidly after the extinction event that ended the age of non-avian dinosaurs. A 2026 comparison of 163 ant genomes found that inferred bursts of these “jumping genes” preceded diversification in some of the most species-rich ant groups. The timing and statistical associations are notable, but they do not prove that the DNA elements caused ants’ evolutionary success.
What are “jumping genes”?
“Jumping genes” is an informal name for transposable elements (TEs), DNA sequences that can move or copy themselves to new positions in a genome. Their activity can alter genome structure and affect how nearby genes work. Over evolutionary time, those changes may contribute to the evolution of gene families and other genomic features.
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In ants, the study found associations between TE content and expansions in odorant-receptor and other gene families. Odorant receptors are part of the system insects use to detect chemical cues. The finding suggests a possible genomic connection to traits relevant to ant biology, but it does not establish that TEs directly produced a particular adaptation.
What did the 2026 ant-genome study find?
Researchers compared 163 ant genomes spanning 12 of the 16 extant ant subfamilies. Ants include more than 15,000 known living species, making them a particularly diverse group for studying how genomic change and lineage diversification may be related. The study, “Transposable elements as evolutionary catalysts of ant macrodiversity”, reports three connected patterns:
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- Model-based reconstructions place many TE insertions in a broad window of about 45–75 million years ago.
- Across the subfamilies analyzed, greater genome-wide TE content was associated with more described genera and species.
- The researchers also identified faster-evolving, TE-rich genomic regions alongside more conserved, TE-poor regions.
The insertion dates are estimates reconstructed from genomes that exist today, not direct observations of ancient DNA. The study’s phylogenetic reconstruction places much of the diversification within ant groups in the first half of the Paleogene, roughly 35–66 million years ago.
How does the timing relate to the dinosaur extinction?
The Cretaceous–Paleogene (K–Pg) extinction occurred about 66 million years ago. It eliminated all non-avian dinosaurs and transformed ecosystems worldwide. The reconstructed window for many ant TE insertions overlaps that boundary and extends into the period afterward; the inferred diversification of many ant groups also falls in the Paleogene.
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That sequence makes a relationship plausible: ecological upheaval could have coincided with changes in ant genomes and subsequent diversification. It does not mean every ant group followed the same path or that the extinction alone explains modern ant diversity. A separate 2024 analysis of the ant fossil record describes multiple periods of diversification and a major extinction interval in the Late Cretaceous. Fossils provide broader historical context, while the 2026 study reconstructs genomic patterns; the fossil analysis does not directly test whether TEs affected diversification.
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Do the statistics show that jumping genes caused ant diversity?
No. They show associations in the sampled data, not a measured causal contribution. Across ant subfamilies, genome-wide TE content was positively associated with described genus counts (adjusted R² = 0.29) and described species counts (adjusted R² = 0.36). Those values describe how well the study’s statistical models fit variation in those measures; they do not mean TEs caused 29% or 36% of ant diversity.
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For lineages present at the K–Pg boundary, the paper reports that peak inferred TE gains were associated in phylogenetic regressions with subsequent descendant-lineage counts (adjusted R² = 0.333), extant genera (0.326), and known species (0.275). These are also model-fit statistics, not percentages of diversity caused by TEs.
The chronology matters: inferred TE gains precede later diversification in the analyses, making the simplest version of reverse causation—diversity first, then TE gains—less plausible. But the authors caution that evolutionary analyses cannot establish causation across millions of years. Ecological upheaval around the K–Pg event could have promoted both TE proliferation and ant diversification independently. The study therefore supports a candidate link, not proof that TEs were the mechanism connecting extinction-era environmental change to ant radiation.
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In a 24 September 2026 announcement, University of Münster research lead Dr Lukas Schrader described the finding this way: “We have now found the genomic mechanism that connects these ecological upheavals to the subsequent rapid diversification of the ants: transposable elements.” That is the announcement’s interpretation. The paper’s own caveat is important: the genomic evidence cannot establish that TEs caused diversification, and shared environmental drivers remain possible.
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