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Nek6 is involved in G2/M phase cell cycle arrest through DNA damage-induced phosphorylation

Min-Young Lee1, Hyun-Ju Kim, Myoung-Ae Kim

  • 1Department of Biochemistry, College of Medicine, Dong-A University, South Korea.

Cell Cycle (Georgetown, Tex.)
|August 30, 2008
PubMed

Insights

Nek6 (NIMA-related kinase 6) is a novel target of the DNA damage checkpoint. DNA damage inhibits Nek6 activity, which is essential for cell cycle arrest during G2/M phase.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Nek6 (NIMA-related kinase 6) is crucial for mitotic cell cycle progression.
  • The DNA damage response involves intricate checkpoint mechanisms to maintain genomic integrity.
  • Understanding kinase involvement in DNA damage response is key to cell cycle regulation.

Purpose of the Study:

  • To investigate the role of Nek6 in the cellular response to DNA damage.
  • To determine if Nek6 activity is regulated by DNA damage checkpoints.
  • To elucidate Nek6's contribution to cell cycle arrest following DNA damage.

Main Methods:

  • Investigated Nek6 phosphorylation status in response to ionizing radiation (IR) and UV irradiation in vivo.
  • Performed in vitro kinase assays to assess direct phosphorylation of Nek6 by Chk1 and Chk2.
  • Analyzed the effect of ectopic Nek6 expression on DNA damage-induced G2/M arrest.

Main Results:

  • Nek6 is phosphorylated upon IR and UV irradiation, indicating its involvement in the DNA damage checkpoint.
  • Checkpoint kinases Chk1 and Chk2 directly phosphorylate Nek6 in vitro.
  • IR and UV irradiation abolish Nek6 activation during mitosis, and ectopic Nek6 expression overrides DNA damage-induced G2/M arrest.

Conclusions:

  • Nek6 is a novel target of the DNA damage checkpoint.
  • Inhibition of Nek6 activity by DNA damage is essential for proper G2/M phase cell cycle arrest.
  • This study reveals a new regulatory mechanism linking mitotic kinases to DNA damage response pathways.

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