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Cyclin-dependent kinase-associated proteins Cks1 and Cks2 are essential during early embryogenesis and for cell cycle

Hanna-Stina Martinsson-Ahlzén1, Vasco Liberal, Björn Grünenfelder

  • 1Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Molecular and Cellular Biology
|July 16, 2008
PubMed

Insights

Simultaneous disruption of CKS1 and CKS2 genes causes embryonic lethality in mice. Cks proteins are essential for cell proliferation and proper gene transcription, impacting cell cycle progression.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Cks proteins are known to associate with cyclin-dependent kinases.
  • Previous studies indicated individual CKS gene deletion does not affect mouse viability.

Purpose of the Study:

  • To investigate the role of Cks proteins in cell cycle regulation.
  • To determine the consequences of simultaneous CKS1 and CKS2 gene disruption.

Main Methods:

  • Simultaneous gene disruption of CKS1 and CKS2 in mice.
  • RNA interference (RNAi)-mediated silencing of CKS genes in mouse embryonic fibroblasts (MEFs) and HeLa cells.
  • Analysis of cell cycle progression, gene transcription, and protein expression.

Main Results:

  • Simultaneous CKS1 and CKS2 disruption leads to embryonic lethality at the morula stage.
  • CKS gene silencing in MEFs and HeLa cells causes proliferation cessation, G2 cell cycle arrest, rereplication, and polyploidy.
  • Impaired transcription of CCNB1, CCNA2, and CDK1 genes was observed.
  • Restoration of cyclin B1 expression rescued the cell cycle arrest phenotype.
  • Cks2 protein is recruited to chromatin and gene regulatory regions with cell cycle periodicity.

Conclusions:

  • Cks proteins are essential for embryonic development and cell proliferation.
  • Cks proteins play a direct role in the transcription of key cell cycle regulatory genes.
  • The findings reveal a critical function of Cks proteins beyond their assumed role in cyclin-dependent kinase regulation.

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