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Suppression of TET1-dependent DNA demethylation is essential for KRAS-mediated transformation

Bo-Kuan Wu1, Charles Brenner1

  • 1Department of Biochemistry, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.

Cell Reports
|December 4, 2014
PubMed

Insights

Oncogenic KRAS suppresses TET1, a DNA demethylating enzyme, leading to hypermethylation and cancer. Restoring TET1 reactivates tumor suppressor genes, inhibiting KRAS-driven cancer cell growth.

Area of Science:

  • Epigenetics
  • Molecular Biology
  • Cancer Biology

Background:

  • Hypermethylation of tumor suppressor genes (TSGs) is crucial in RAS-driven cancers.
  • Ten-eleven translocation (TET) enzymes reduce DNA methylation by converting 5-methylcytosine (5mC) to 5-hydroxymethylcytosine (5hmC).

Purpose of the Study:

  • To investigate the role of TET1 suppression in KRAS-induced tumorigenesis.
  • To elucidate the mechanism by which oncogenic KRAS influences DNA methylation and transformation.

Main Methods:

  • Investigated TET1 expression and activity in KRAS-transformed cells.
  • Utilized ERK signaling pathway inhibitors and ectopic TET1 reintroduction.
  • Performed KRAS knockdown and KRAS/TET1 double knockdown experiments.

Main Results:

  • Oncogenic KRAS inhibits TET1 expression via the ERK pathway, reducing 5hmC and increasing 5mC at TSG promoters.
  • Suppression of TET1 is essential for KRAS-mediated DNA hypermethylation and cellular transformation.
  • Restoring TET1 reactivates TSGs and inhibits colony formation in KRAS-transformed cells.

Conclusions:

  • TET1 suppression is a critical step in KRAS-driven cancer development.
  • Targeting the KRAS-TET1 axis offers a potential therapeutic strategy for RAS-dependent cancers.

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