🧬 Ready to use: DNA adopts a 3D structure enabling its exploitation

How does DNA structure itself from the very first moments of life? A team of researchers has just observed that DNA adopts a defined three-dimensional architecture much more rapidly than previously thought.

This discovery is the result of studying the Drosophila embryo, a model organism in genetics. In the hours following fertilization, the nuclei divide at a rapid pace, offering a window for observing cell formation. The use of a new method developed by the team allowed for mapping the 3D organization of the genome with unprecedented precision. Far from being chaotic, DNA folds according to a modular pattern, with loops and structures that prepare for gene activation.


According to the researchers, this structure constitutes a scaffold for future gene expression. The way DNA folds directly influences which regions of the genome will be accessible and active. This early organization allows genetic instructions to be ready at the right time, a determining factor for harmonious development.

The scope of this work extends beyond Drosophila. A complementary study, published in Nature Cell Biology, applied a similar mapping to human cells. The scientists examined the consequences of removing the molecular anchors that stabilize the 3D structure of DNA. They then observed that a disruption of this structural framework triggers an unexpected cellular reaction.

This perturbation is interpreted by the cells as a viral attack, which triggers an immune response. This activation of the innate immune system could promote inflammation and certain pathologies.

The combination of these two studies shows the fundamental importance of the spatial organization of DNA. The first reveals its meticulous construction from the dawn of life, while the second measures the effects of its collapse. These elements help refine our understanding of developmental mechanisms and their possible links to certain disorders.