E2F1 triggers cell division by bypassing the usual unpacking step

UC Santa Cruz researchers found that E2F1, a protein disrupted in many cancers, can bind a small region of still tightly packed DNA and switch on cell-cycle genes without the substantial chromatin unpacking used in ordinary division. Cells sense an E2F1 threshold; once crossed, dormant cells begin dividing. Without additional growth signals, the shortcut drove at most three divisions and acted faster than the typical nutrient-driven process. The work suggests that some cancer cells may exploit this mechanism, but researchers have not yet identified which cancers depend on it or a molecule that safely blocks it. It is a potential target mechanism, not an available treatment.