Cyclin E in normal physiology and disease states

E-type cyclins, collectively called cyclin E, represent key components of the core cell cycle machinery. In mammalian cells, two E-type cyclins, E1 and E2, activate cyclin-dependent kinase 2 (CDK2) and drive cell cycle progression by phosphorylating several cellular proteins. Abnormally elevated activity of cyclin E-CDK2 has been documented in many human tumor types. Moreover, cyclin E overexpression mediates resistance of tumor cells to various therapeutic agents. Recent work has revealed that the role of cyclin E extends well beyond cell proliferation and tumorigenesis, and it may regulate a diverse array of physiological and pathological processes. In this review, we discuss these various cyclin E functions and the potential for therapeutic targeting of cyclin E and cyclin E-CDK2 kinase.

Automated summary

E-type cyclins, especially cyclin E, play a crucial role in cell cycle progression by activating CDK2. Abnormally elevated activity of cyclin E-CDK2 has been observed in various human tumors, and cyclin E overexpression is linked to resistance of tumor cells to therapeutic agents. Beyond cell proliferation and tumorigenesis, cyclin E may regulate a diverse array of physiological and pathological processes.