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CTCF haploinsufficiency destabilizes DNA methylation and predisposes to cancer

Christopher J Kemp1, James M Moore1, Russell Moser1

  • 1Division of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.

Cell Reports
|May 6, 2014
PubMed

Insights

CTCF loss causes cancer. Hemizygous loss of CTCF leads to increased cancer susceptibility and aggressiveness by disrupting epigenetic stability, establishing CTCF as a tumor suppressor.

Area of Science:

  • Cancer Biology
  • Epigenetics
  • Genomics

Background:

  • Epigenetic alterations, especially DNA methylation changes, are common in cancer but their origins and effects are unclear.
  • CTCF, a chromatin organizer, is often altered in human cancers, but its causal role in tumorigenesis remains unproven.

Purpose of the Study:

  • To investigate the role of CTCF in cancer development and tumor suppression.
  • To determine if CTCF haploinsufficiency contributes to cancer susceptibility and epigenetic instability.

Main Methods:

  • Generation and analysis of Ctcf hemizygous knockout (Ctcf(+/-)) mice.
  • Assessment of tumor incidence, aggressiveness (invasion, metastasis), and differentiation in Ctcf(+/-) mice.
  • Genome-wide CpG methylation analysis in tissues with hemizygous CTCF loss.

Main Results:

  • Ctcf(+/-) mice showed high susceptibility to spontaneous, radiation-, and chemically induced cancers across various tissues.
  • Tumors from Ctcf(+/-) mice exhibited increased aggressiveness, invasion, metastasis, and mixed epithelial/mesenchymal features.
  • Hemizygous loss of CTCF resulted in widespread variability in CpG methylation across the genome.

Conclusions:

  • CTCF is a critical tumor suppressor, and its haploinsufficiency promotes cancer development.
  • CTCF plays a vital role in maintaining epigenetic stability, acting as a barrier against neoplastic progression.
  • Disruption of CTCF function leads to genome-wide methylation instability, contributing to cancer aggressiveness.

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