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Related Experiment Videos

Cancer cells express aberrant DNMT3B transcripts encoding truncated proteins.

K R Ostler1, E M Davis, S L Payne

  • 1Section of Hematology/Oncology, Department of Medicine, University of Chicago, Chicago, IL 60637, USA.

Oncogene
|March 14, 2007
PubMed
Summary
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Aberrant splicing of DNA methyltransferase 3B (DNMT3B) in cancer cells produces truncated proteins. These truncated DNMT3B variants may contribute to abnormal DNA methylation patterns observed in tumors.

Area of Science:

  • Cancer Biology
  • Epigenetics
  • Molecular Oncology

Background:

  • Cancer cells exhibit distinct DNA methylation patterns compared to normal cells.
  • Hypermethylation of tumor suppressor genes and hypomethylation of repetitive DNA are characteristic of cancer.
  • Mechanisms underlying aberrant DNA methylation in cancer remain largely unknown.

Purpose of the Study:

  • To investigate the role of aberrant DNA methyltransferase 3B (DNMT3B) transcripts in cancer.
  • To determine if truncated DNMT3B proteins can alter DNA methylation and gene expression.

Main Methods:

  • Identification and characterization of DNMT3B transcripts in cancer cell lines and primary leukemia cells.
  • Western blot analysis to detect truncated DNMT3B isoforms.
  • Expression of DNMT3B7 in 293 cells followed by microarray analysis and CpG island methylation analysis.

Related Experiment Videos

Main Results:

  • Over 20 aberrant DNMT3B transcripts, many retaining introns and encoding truncated proteins, were identified in cancer cells.
  • Truncated DNMT3B isoforms were detected in nuclear extracts of cancer cells.
  • Expression of DNMT3B7 led to altered gene expression and DNA methylation of CpG islands in 293 cells.

Conclusions:

  • Aberrantly spliced DNMT3B transcripts producing truncated proteins are present in cancer cells.
  • Truncated DNMT3B proteins have the potential to influence DNA methylation patterns and gene expression.
  • These findings suggest a novel mechanism by which cancer cells establish abnormal DNA methylation profiles.