The PEBP2beta/CBF beta-SMMHC chimeric protein is localized both in the cell membrane and nuclear subfractions of

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Genome-wide Analysis using ChIP to Identify Isoform-specific Gene Targets
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Genome-wide Analysis using ChIP to Identify Isoform-specific Gene Targets

Published on: July 7, 2010

S Kanto1, N Chiba, Y Tanaka

  • 1Department of Molecular Immunology, Institute of Development, Aging and Cancer, School of Medicine, Tohoku University, Sendai, Japan.

Leukemia
|July 29, 2000
PubMed

Insights

Chromosomal inversion (16)(p13q22) in acute myeloid leukemia creates a fusion protein that interferes with Runt protein function. This dominant interference occurs within the cell nucleus, impacting transcription factors.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • The chromosomal inversion (16)(p13q22) is a hallmark of the M4-eosinophilia subtype of acute myeloid leukemia (AML).
  • This inversion leads to the formation of a chimeric gene encoding the PEBP2p/CBFp-SMMHC fusion protein.
  • PEBP2p/CBFp-SMMHC interferes with the function of Runt homology domain proteins, which are crucial components of the PEBP2/CBF transcription factor.

Purpose of the Study:

  • To investigate the subcellular localization of the PEBP2beta/CBFbeta-SMMHC fusion protein and Runt protein homologs in AML cells with inversion 16.
  • To determine the site of dominant interference of PEBP2beta/CBFbeta-SMMHC on PEBP2/CBF function.

Main Methods:

  • Immunoblot analysis of subcellular fractions from leukemic cells carrying inversion 16.
  • Fractionation of nuclear components, including high-salt extraction to isolate DNA-bound proteins.

Main Results:

  • Significant amounts of PEBP2beta/CBFbeta-SMMHC and Runt protein homologs were found in the nuclear fraction.
  • Both polypeptides were detected in the DNA pellet, indicating interaction with DNA within the nucleus.
  • PEBP2beta/CBFbeta-SMMHC was also found in the cytoplasmic membrane fraction, but its function there is unclear.

Conclusions:

  • The dominant interfering effect of PEBP2beta/CBFbeta-SMMHC on PEBP2/CBF occurs within the cell nucleus.
  • The presence of PEBP2beta/CBFbeta-SMMHC in the cytoplasmic membrane suggests potential non-canonical functions unrelated to Runt protein homologs.

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