Topoisomerase I Not Simply Adjusting Genome Topology
Topoisomerases are well known to be essential for all aspects of DNA function, from replication to repair and particularly in transcription. For this reason, they have for many years been excellent DNA damaging agents that display selectively for tumor cells. A relatively recent finding has come to light that involves topoisomerase I and induction of cellular senescence. Cellular senescence is a form of tumor suppression that puts cells in a more or less permanent proliferative arrest. It is induced by…