CDK7

Class

CDK7 inhibitor

Pathway

cell-cycle progression / transcriptional regulation

CDK7 (cyclin-dependent kinase 7) is an enzyme with a dual role in cell biology. It is a catalytic subunit of the CDK-activating kinase (CAK) complex, which switches on other cyclin-dependent kinases that drive progression through the cell division cycle. CDK7 is also a component of the general transcription factor TFIIH, where it phosphorylates the tail of RNA polymerase II to help initiate the copying of genes into RNA. Because of this second function, CDK7 activity is particularly important for sustaining the high levels of transcription that certain cancer cells depend on, including transcription of genes that promote uncontrolled growth. Inhibiting CDK7 can therefore act on two fronts simultaneously: slowing cell-cycle progression directly, and reducing the transcriptional output that tumor cells rely on to maintain their proliferative and survival programs. This dual mechanism has made CDK7 an area of interest across several solid tumor types, including hormone-driven and treatment-resistant breast cancers, where transcriptional dependencies can help cells escape other therapies. As with other cell-cycle and transcription-related targets, modulating CDK7 carries an inherent trade-off, since the same pathways are also required for normal, healthy dividing tissues.