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CRL4B promotes tumorigenesis by coordinating with SUV39H1/HP1/DNMT3A in DNA methylation-based epigenetic silencing

Y Yang1, R Liu1, R Qiu2

  • 1Key Laboratory of Experimental Teratology, Ministry of Education, Institute of Molecular Medicine and Genetics, Shandong University School of Medicine, Jinan, Shandong, China.

Oncogene
|December 3, 2013
PubMed

Insights

Cullin 4B (CUL4B) E3 ligase complex drives tumorigenesis by coordinating epigenetic silencing. It links histone ubiquitination to DNA methylation, repressing tumor suppressors like IGFBP3.

Area of Science:

  • Epigenetics
  • Molecular Biology
  • Cancer Research

Background:

  • Cullin 4B (CUL4B) is part of the CRL4B E3 ligase complex, involved in proteolysis and tumorigenesis.
  • CRL4B interacts with key epigenetic regulators including SUV39H1, HP1, and DNMT3A.

Purpose of the Study:

  • To elucidate the role of CRL4B in epigenetic modifications and its contribution to tumorigenesis.
  • To investigate the functional link between CRL4B, histone modifications, and DNA methylation.

Main Methods:

  • Investigated CRL4B's association with SUV39H1, HP1, and DNMT3A.
  • Analyzed the effect of CUL4B depletion on H2AK119 monoubiquitination, H3K9 trimethylation, and DNA methylation.
  • Assessed the impact of CUL4B on gene expression, cell proliferation, and invasion.

Main Results:

  • CRL4B catalyzes H2AK119 monoubiquitination, facilitating H3K9 trimethylation and DNA methylation for gene silencing.
  • CUL4B depletion led to derepression of genes, including the tumor suppressor IGFBP3.
  • CUL4B promotes proliferation and invasion, partly by repressing IGFBP3, and is upregulated in cervical cancer.

Conclusions:

  • CRL4B coordinates histone ubiquitination and DNA methylation for transcriptional repression.
  • This mechanism provides a novel insight into CUL4B's role in tumorigenesis.

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