Cyclin-dependent kinase 2 is dispensable for normal centrosome duplication but required for oncogene-induced centrosome overduplication

Oncogene. 2006 May 11;25(20):2943-9. doi: 10.1038/sj.onc.1209310.


Cyclin-dependent kinase 2 (CDK2) has been proposed to function as a master regulator of centrosome duplication. Using mouse embryonic fibroblasts (MEFs) in which Cdk2 has been genetically deleted, we show here that CDK2 is not required for normal centrosome duplication, maturation and bipolar mitotic spindle formation. In contrast, Cdk2 deficiency completely abrogates aberrant centrosome duplication induced by a viral oncogene. Mechanistically, centrosome overduplication in MEFs wild-type for Cdk2 involves the formation of supernumerary immature centrosomes. These results indicate that normal and abnormal centrosome duplication have significantly different requirements for CDK2 activity and point to a role of CDK2 in licensing centrosomes for aberrant duplication. Furthermore, our findings suggest that CDK2 may be a suitable therapeutic target to inhibit centrosome-mediated chromosomal instability in tumor cells.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Centrosome / metabolism*
  • Cyclin-Dependent Kinase 2 / genetics
  • Cyclin-Dependent Kinase 2 / physiology*
  • Embryo, Mammalian / cytology
  • Embryo, Mammalian / metabolism
  • Fibroblasts / cytology
  • Fibroblasts / metabolism
  • Gene Duplication*
  • Mice
  • Mice, Knockout
  • Oncogene Proteins, Viral / physiology*
  • Papillomavirus E7 Proteins
  • RNA, Small Interfering / pharmacology


  • Oncogene Proteins, Viral
  • Papillomavirus E7 Proteins
  • RNA, Small Interfering
  • oncogene protein E7, Human papillomavirus type 16
  • Cyclin-Dependent Kinase 2