A novel Chk1/2-Lats2-14-3-3 signaling pathway regulates P-body formation in response to UV damage

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Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins
10:24

Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins

Published on: September 28, 2012

Nobuhiro Okada1, Norikazu Yabuta, Hirokazu Suzuki

  • 1Department of Molecular Genetics, Research Institute for MicroFbial Diseases, Osaka University, 3-1 Yamadaoka, Suita City, Osaka 565-0871, Japan.

Journal of Cell Science
|December 2, 2010
PubMed

Insights

UV radiation triggers the Chk1/2-Lats2-14-3-3 pathway, impacting P-body formation and genome integrity. This study reveals Lats2 and 14-3-3 as key regulators of DNA damage response.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Maintaining genome integrity through proper DNA damage response is crucial.
  • The role of tumor suppressors like Lats2 in DNA damage signaling is an active area of research.
  • P-bodies are cellular sites involved in mRNA regulation and degradation.

Purpose of the Study:

  • To investigate the role of Lats2 in the cellular response to ultraviolet (UV) radiation.
  • To identify the signaling pathway connecting UV-induced DNA damage to P-body formation.
  • To elucidate the function of Lats2 and its interaction with 14-3-3 proteins in this process.

Main Methods:

  • In vivo phosphorylation analysis of Lats2 and 14-3-3γ.
  • Immunoprecipitation and western blot to confirm protein interactions.
  • siRNA-mediated depletion of Lats2, 14-3-3γ, and Lats1 to assess their roles in P-body formation.
  • Microscopy to observe P-body assembly in response to UV radiation.

Main Results:

  • Lats2 is phosphorylated by Chk1 and Chk2 at S408 in response to UV radiation.
  • Phosphorylated Lats2 phosphorylates 14-3-3γ at S59, promoting its translocation to P-bodies.
  • Depletion of Lats2 or 14-3-3γ inhibits UV-induced P-body formation, while Lats1 depletion has no effect.
  • The Chk1/2-Lats2-14-3-3 pathway connects DNA damage signals to P-body assembly.

Conclusions:

  • The study identifies a novel signaling axis (Chk1/2-Lats2-14-3-3) crucial for DNA damage response.
  • Lats2 and 14-3-3 proteins are essential regulators of UV-induced P-body formation.
  • This pathway plays a significant role in maintaining genome integrity following DNA damage.

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