New genetic research may reveal the secret to how cephalopods, including octopuses, developed some of the most complex nervous systems in the animal kingdom.
A recent study by University of Vienna scientists, published in Nature Communications, suggests that the three-dimensional organization of the coleoid cephalopod genome may have played an important role in the evolution of these creatures’ remarkable cognitive abilities.
This group of marine animals includes octopuses, squid, and cuttlefish, which possess large, elaborate nervous systems with highly distributed neural networks. Octopuses, in particular, have demonstrated impressive problem-solving abilities and the capacity to rapidly change their appearance through camouflage.
Reorganizing the Octopus Genome
According to the researchers’ analysis, an important event in cephalopod evolution hundreds of millions of years ago may have helped establish the genetic foundations for the remarkable behaviors observed in modern octopuses and their relatives.
An ancient reorganization of DNA dramatically altered how genetic material was arranged within cells, bringing previously distant regions of the genome into closer proximity. This reshuffling may have had a profound impact on gene regulation in cephalopods.
Understanding this ancient transformation could reveal more than just how cephalopods evolved. It may also offer new insights into how complex biological traits emerge throughout evolution.
Analyzing Octopus DNA
The research examined the genomes of coleoid cephalopods, investigating the three-dimensional organization of genetic material and patterns of gene activity in octopuses, squid, and cuttlefish.
“The genome isn’t just a sequence of genes. It’s folded into a complex three-dimensional structure,” said lead author Dr Thea Rogers. “Understanding how that structure evolves is becoming increasingly important for understanding how new forms of biological complexity arise.”
The researchers found evidence that major genomic reorganization occurred hundreds of millions of years ago. Rather than unfolding entirely through gradual changes, this restructuring appears to have involved a relatively rapid period of extensive genomic reshuffling, bringing previously separated regions of DNA into closer contact.
Once these regions come into proximity, they can interact and influence one another, potentially establishing new connections within the genome’s regulatory networks through a process the researchers describe as regulatory entanglement.
Regulatory Entanglement
Regulatory entanglement may help explain how genetic systems balance stability with evolutionary innovation. By establishing new interactions between regulatory elements and genes, genomic reorganization can potentially alter patterns of gene expression while preserving essential biological functions.
According to the University of Vienna researchers’ analysis, different components of the genome’s three-dimensional architecture responded differently to this ancient reorganization. Smaller structures known as chromatin loops were particularly affected, while larger organizational units called chromatin domains remained comparatively stable.
Many of the newly established interactions involved genomic regions associated with important biological functions, including the development and operation of cephalopods’ central nervous systems.
The effects of these interactions also varied considerably depending on the species, tissue type, and developmental stage examined. Notably, more flexible regions of the genome appeared particularly susceptible to changes in their regulatory interactions.
The findings offer a new perspective on the relationship between genome organization and evolution. Rather than serving merely as a passive framework for storing genetic information, the three-dimensional architecture of DNA may actively influence how genes interact and how complex biological traits emerge.
The researchers suggest that these changes in genomic organization may have contributed to the evolution of the sophisticated nervous systems found in octopuses and other coleoid cephalopods, offering a potentially important new explanation for their remarkable biological complexity.
The paper, “Genome Reorganisation and Expansion Shape 3D Genome Architecture and Define a Distinct Regulatory Landscape in Coleoid Cephalopods,” appeared in Nature Communications on October 9, 2026.
Ryan Whalen covers science and technology for The Debrief. He holds an MA in History and a Master of Library and Information Science with a certificate in Data Science. He can be contacted at ryan@thedebrief.org, and follow him on Twitter @mdntwvlf.