Cancer Might Be Breaking Its Own DNA, And That Could Be Its Weak Spot

To grow as fast as they do, cancer cells push certain genes to work far harder than any healthy cell would tolerate. A new study in Science Advances suggests that this relentless overdrive doesn’t just fuel growth, it may also be quietly damaging the tumor’s own DNA, in a way that could eventually be turned against it.

The study, led by PhD student Osama Hidmi under Prof. Rami Aqeilan at the Hebrew University of Jerusalem, points to a specific culprit: super-enhancers, the powerful DNA control regions that act like control panels, cranking up the activity of nearby cancer-promoting genes.

Growing fast has a cost

Cancer cells activate growth, survival, and division genes at levels healthy cells never reach. That level of activity is known as hypertranscription, and it turns out to place real physical strain on the DNA itself. Using a genome-mapping technique called sBLISS, the researchers charted exactly where double-strand breaks, the most severe form of DNA damage, in which both strands of the molecule are severed, occur across the cancer genome.

The breaks weren’t scattered randomly. They clustered inside the genes that super-enhancers were driving hardest, suggesting that keeping a gene locked in constant high-output mode is enough, on its own, to make the DNA snap.

A repair cycle that isn’t perfect

Cancer cells aren’t defenseless against this damage, they repair it, repeatedly, using the cell’s natural DNA-repair machinery. But repair isn’t the same as restoration. Each cycle of breaking and fixing carries a small risk of error, and over time those errors accumulate specifically in the regions under the most transcriptional stress.

“That cycle may help tumors survive in the short term, but it also increases the risk of mutations that can fuel cancer’s evolution,” says Prof. Rami Aqeilan.

In other words, the very regions cancer relies on most to keep growing are also becoming increasingly unstable, a self-inflicted mutation engine that could help tumors adapt, resist treatment, or spread.

Turning a dependency into a target

The flip side of this finding is what makes it interesting for treatment. Because cancer cells depend so heavily on super-enhancer-driven genes to keep growing, those same DNA regions may represent a genuine vulnerability. Therapies designed to interfere with either the intense gene activity itself, or with the repair machinery patching up the resulting breaks, could make it much harder for tumors to keep evolving.

As Hidmi put it, the fact that cancer cells depend on these high-stress regions to survive means they may also be unusually vulnerable there, opening the door to treatments that target the very processes tumors need most.

Original paper: Hidmi, O., Shatleh, D., Oster Flayshman, S., Monin, J., & Aqeilan, R. I. (2026). Superenhancers shape the landscape and repair dynamics of transcription-associated DNA breaks in cancer. Science Advances, 12(4). https://www.science.org/doi/10.1126/sciadv.aeb6379 

Source: Cancer Might Be Breaking Its Own DNA, And That Could Be Its Weak Spot