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Cooperative interaction between ETS1 and GFI1 transcription factors in the repression of Bax gene expression

Y Nakazawa1, M Suzuki, N Manabe

  • 1Department of Cell Genetics, Sasaki Institute, Tokyo, Japan.

Oncogene
|January 11, 2007
PubMed

Insights

The proto-oncoproteins ETS1 and growth factor independent-1 (GFI1) interact to regulate gene expression. Their complex formation on the Bax promoter represses Bax expression, impacting cell growth and differentiation.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • Proto-oncoproteins ETS1 and GFI1 are crucial for cell growth and differentiation.
  • Deregulated expression of ETS1 and GFI1 is linked to malignant transformation.

Purpose of the Study:

  • To investigate the interaction between ETS1 and GFI1.
  • To elucidate their combined role in regulating gene expression, specifically the Bax promoter.

Main Methods:

  • Co-immunoprecipitation and glutathione-S-transferase pull-down assays to confirm protein interaction.
  • Luciferase assays to assess transcriptional activity.
  • Site-directed mutagenesis and chromatin immunoprecipitation to analyze promoter binding.
  • Small interfering RNA (siRNA) to evaluate gene expression changes.

Main Results:

  • ETS1 and GFI1 directly interact via their respective Ets and zinc-finger domains.
  • ETS1 and GFI1 reciprocally repress each other's transcriptional activity.
  • Cooperative repression of the Bax promoter by ETS1 and GFI1 requires adjacent Ets-binding sites (EBS) and Gfi-binding sites (GBS).
  • An ETS1-GFI1 complex forms on the Bax promoter, inhibiting Bax gene expression in vivo.

Conclusions:

  • The interaction between ETS1 and GFI1 is critical for their cooperative binding to the Bax promoter.
  • ETS1 and GFI1 complex formation leads to the repression of Bax expression.
  • This cross-talk influences cellular processes involved in growth, differentiation, and potentially malignant transformation.

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