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KMT Set7/9 affects genotoxic stress response via the Mdm2 axis

Larissa Lezina1, Vasilisa Aksenova1, Olga Fedorova1

  • 1Gene Expression Laboratory, Institute of Cytology, Saint-Petersburg, 194064, Russia.

Oncotarget
|August 29, 2015
PubMed

Insights

The lysine-specific methyltransferase Set7/9 regulates DNA damage response and repair by controlling Mdm2 expression. Inverse Set7/9 and Mdm2 levels in cancer cells impact survival and patient outcomes.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Genetics

Background:

  • Genotoxic stress from anti-cancer drugs causes DNA breaks and genome instability.
  • DNA double-strand breaks activate the ATM kinase signaling pathway, triggering cell cycle arrest and DNA repair.
  • Histone modifications and signaling pathways influence cellular sensitivity to genotoxic stress.

Purpose of the Study:

  • To investigate the role of lysine-specific methyltransferase (KMT) Set7/9 in DNA damage response (DDR) and repair.
  • To determine if Set7/9 regulates the expression of the E3 ubiquitin ligase Mdm2.
  • To explore the clinical significance of Set7/9 and Mdm2 expression in cancer patient survival.

Main Methods:

  • Experimental approaches to assess Set7/9's effect on DDR and DNA repair.
  • Co-immunoprecipitation to confirm physical interaction between Set7/9 and Mdm2.
  • Analysis of cancer cell line survival under genotoxic stress with varying Set7/9 and Mdm2 levels.
  • Bioinformatics analysis of patient data correlating Set7/9 and Mdm2 expression with survival outcomes.

Main Results:

  • Set7/9 influences DNA damage response and repair, partly by regulating Mdm2 expression.
  • Set7/9 physically interacts with Mdm2.
  • Cancer cell lines with inverse Set7/9 and Mdm2 expression showed reduced survival under genotoxic stress.
  • Bioinformatics data indicated that high Mdm2 and low Set7/9 expression in cancer patients is linked to poor survival.

Conclusions:

  • Set7/9 plays a role in DNA damage response and repair through Mdm2 regulation.
  • The inverse relationship between Set7/9 and Mdm2 expression affects cancer cell survival and patient prognosis.
  • Targeting Set7/9 or Mdm2 could be a potential therapeutic strategy for improving cancer patient outcomes.
Keywords:
DNA damageMdm2Set7/9genotoxic stressoperetta

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