UT Southwestern study tracks the first changes after a cancer-defense gene shuts down

What happens in the first two days after a cell loses one of its defenses against cancer? A UT Southwestern team in Dallas has built a way to watch.

Researchers switched off the tumor-suppressor gene p53 in unstressed mouse embryonic stem cells, then tracked the immediate response. Within 48 hours, cells showed changes in how they used energy, activity in mobile genetic elements and the activation of gene programs associated with reproductive cells. Individual cells responded differently.

UT Southwestern announced the findings Oct. 7. The study in Genes & Development, led by a team including first author Yang Fan and corresponding author John Abrams, was published online Sept. 22.

The experimental system helps researchers distinguish the earliest effects of losing p53 from changes that accumulate later. That distinction matters when trying to understand how a healthy cell’s safeguards fail.

The work remains a laboratory study in mouse cells. It does not establish a treatment or a way to prevent cancer, and researchers still need to determine how these early disruptions contribute to malignancy.