Imagine a world where the secrets of life’s ancient history are hidden within tiny, mobile pieces of DNA—sounds like science fiction, right? But it’s not. These ‘jumping genes,’ scientifically known as transposons, are revolutionizing our understanding of evolution, and they might just hold the key to resolving the intricate branches of the tree of life. And this is the part most people miss: while genomes have long been our go-to for tracing evolutionary paths, transposons—often overlooked—are now stepping into the spotlight as powerful tools for unraveling mysteries millions of years old.
Genomes, the complete set of genetic instructions found in every living organism, have been instrumental in mapping how species have evolved over time. By examining the presence or absence of specific genetic sequences and mutations, scientists can piece together the order in which species diverged. However, even the most advanced methods struggle to accurately reconstruct evolutionary events that occurred hundreds of millions of years ago. But here’s where it gets controversial: a groundbreaking study published in Current Biology by researchers at the Okinawa Institute of Science and Technology (OIST) has harnessed the power of these ‘jumping genes’ to reconstruct the termite tree of life, offering a fresh perspective on solving ancient evolutionary puzzles.
‘Phylogenetic trees, which illustrate the relationships between different organisms, are the backbone of evolutionary biology,’ explains Professor Thomas Bourguignon, lead author of the study and head of the OIST Evolutionary Genomics Unit. ‘They help us trace the origins of modern biodiversity and guide conservation efforts.’ Yet, predicting evolution across vast timescales isn’t straightforward. ‘Phylogenetic signals can be faint, and rapid radiation events—where species diversify quickly—add layers of complexity, making it challenging to determine the sequence of species emergence,’ he adds. ‘Our new method empowers researchers to tackle these complexities head-on.’
So, what exactly makes a gene ‘jump’? Transposons, or transposable elements, are DNA sequences with a unique ability to move from one location to another within the genome. This movement can cause mutations and increase genetic diversity. Found abundantly in eukaryotes—organisms with cells containing nuclei, such as animals, plants, and fungi—transposons make up to 50% of the human genome and even more in some other species. Despite their prevalence, they’ve been largely overshadowed by other DNA markers in tree of life studies.
‘Until recently, characterizing transposons at the genome level was a daunting task,’ notes Cong Liu, a PhD student at OIST and first author of the study. ‘Phylogenetic research has traditionally focused on conserved genes—those encoding essential proteins that change slowly over time, making them reliable for studying long-term evolution.’ But this slow rate of change has a drawback: it becomes difficult to resolve rapid radiation events, where species diverge quickly with minimal genetic differences in conserved genes. Here, transposons, with their dynamic movement across the genome, offer a unique advantage by providing insights into species divergence.
To demonstrate the utility of transposons, the team sequenced 45 termite and two cockroach genomes, carefully selecting a diverse range of species to represent different families and subfamilies. They identified nearly 38,000 transposon families across these genomes. By analyzing the presence and absence of transposons in the 47 species, they constructed a tree of life, mapping the divergence points of each species from their ancestors. When compared to previously published termite trees, their method achieved accuracy on par with those built using thousands of protein marker sequences. ‘This approach not only validates the use of transposons but also opens doors to new possibilities,’ says Prof. Bourguignon.
One such possibility is overcoming DNA degradation, a common challenge in studying older specimens, such as those from museum collections. ‘DNA naturally degrades over time, and this process accelerates in hotter, more humid climates—precisely where many biodiversity hotspots are located,’ explains Mr. Liu. ‘Even in short timescales, from specimen collection to sequencing, degradation can pose significant challenges. But with historical samples, it’s an even bigger hurdle.’ Since transposons are short sequences, they can be retrieved from fragmented DNA, making them ideal for working with limited or degraded genetic material.
While the team continues to explore termite genomics, uncovering insights into their physiology, social structures, and dietary evolution, they hope this study will inspire researchers across disciplines to leverage transposons in studying biodiversity and evolution across the animal kingdom. ‘Our method complements existing phylogenetic techniques, and we believe it can unlock new evolutionary information and resolve long-standing mysteries,’ Prof. Bourguignon concludes.
But here’s the thought-provoking question: If transposons have been underutilized for so long, what other untapped genetic elements might be hiding in plain sight, waiting to reshape our understanding of life’s history? Share your thoughts in the comments—do you think transposons will revolutionize evolutionary biology, or is there another genetic marker we should be focusing on?
