Researchers at EMBL Heidelberg's Krebs Group have introduced a new genetic tool aimed at explaining one of biology's central questions: how cells decide which genes to switch on. Although the human genome contains more than 20,000 genes, only a limited set is active in any given cell at any moment.
That selective activity is what allows different cell types to exist and function, even though they carry the same genetic information. The new approach is designed to help scientists examine the underlying logic of gene regulation, or the rules that determine when genes are active and when they remain silent.
According to the report, the method offers an experimental way to study how cells make these choices rather than simply observing the outcome. By giving researchers a more direct tool for probing gene control, the work could improve understanding of how gene activity is organized inside cells.
The study highlights a broader push in genetics to move beyond listing genes and toward understanding how they are coordinated. For researchers, tools like this could make it easier to decode the systems that control gene expression across the human genome.
