Human cells can exchange genomic DNA that alters cell behavior – Image for illustrative purposes only (Image credits: Unsplash)
Researchers have found that sizable segments of genomic DNA can pass straight from one human cell to another. Once inside the recipient cell, the transferred material can remain intact and modify how that cell operates. The work, reported in the journal Cell, comes from scientists at the Children’s Medical Center Research Institute at UT Southwestern and directly contradicts the long-held assumption that each cell’s genome changes on its own.
A Finding That Defies Prior Assumptions
For decades, biologists viewed the genome inside any single cell as largely self-contained. Changes were thought to arise mainly through mutations that occur within that cell or through inheritance during division. The new evidence shows that large DNA fragments can cross cell boundaries without the usual processes of reproduction or viral infection.
This movement appears capable of delivering functional genetic information that the receiving cell then uses. Because the transferred DNA persists, it can produce lasting shifts in cell behavior rather than temporary effects. The observation forces a re-examination of how genetic material is shared within tissues and organs.
What the Experiments Showed
The team demonstrated that the transferred DNA segments are substantial in size and can integrate into the recipient cell’s existing genome. Once incorporated, these pieces continue to be expressed, leading to measurable changes in the cell’s activity. The process was observed under controlled laboratory conditions using human cells, confirming that the exchange occurs without external agents such as viruses.
Importantly, the transferred material does not simply degrade or remain inert. It remains biologically active, altering the cell’s properties in ways that can be tracked over multiple generations of cell division. These results were obtained through a combination of genetic tracking methods that allowed the researchers to follow the movement and persistence of specific DNA sequences.
Remaining Questions and Next Steps
While the transfer itself has now been documented, many details about how it occurs naturally inside the body are still unknown. It is unclear how frequently such exchanges happen in healthy tissues, whether certain cell types are more likely to participate, or what triggers the movement under normal conditions. The study also leaves open the question of whether this process contributes to disease states or plays a role in normal development and tissue maintenance.
Future work will need to determine the molecular machinery that enables the transfer and to test whether similar events take place in living organisms rather than in isolated cells. Until those experiments are completed, the full biological significance of the finding remains to be established.
A Revised View of Cellular Genomes
The discovery adds a new layer to how scientists think about genetic stability and variation within the human body. Instead of each cell operating with a fixed and independent set of instructions, genomes may be more fluid, capable of exchanging material across cell boundaries. This fluidity could influence everything from tissue repair to the spread of certain cellular traits.
At the same time, the finding underscores how much remains to be learned about the rules that govern these exchanges. Continued careful study will be required to separate the basic mechanism from its possible roles in health and disease.
