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Identification of Transcription Factor Regulators using Medium-Throughput Screening of Arrayed Libraries and a Dual-Luciferase-Based Reporter
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Identification of Transcription Factor Regulators using Medium-Throughput Screening of Arrayed Libraries and a Dual-Luciferase-Based Reporter

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Yin Yang 1 induces transcriptional activity of p73 through cooperation with E2F1

Shourong Wu1, Saomi Murai, Kazunori Kataoka

  • 1Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Biochemical and Biophysical Research Communications
|November 6, 2007
PubMed

Insights

Transcription factor p73 is crucial for development and tumorigenesis. This study reveals that Yin Yang 1 (YY1) and E2F1 cooperate to regulate p73 expression, uncovering a new mechanism in cancer development.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Gene Regulation

Background:

  • The transcription factor p73, a homolog of p53, is vital in tumorigenesis, differentiation, and development.
  • The precise regulatory mechanisms governing the p73 pathway remain incompletely understood.

Purpose of the Study:

  • To elucidate the role of Yin Yang 1 (YY1) in regulating p73 expression and activity.
  • To investigate the potential cooperative interaction between YY1 and E2F1 in p73 transcriptional regulation.

Main Methods:

  • YY1 and E2F1 silencing experiments to assess their impact on p73 promoter activity.
  • Overexpression studies of YY1 to determine its effect on p73.
  • Immunofluorescence staining and co-immunoprecipitation assays to confirm protein interactions.
  • Analysis of doxorubicin-induced activation of the p73 promoter.

Main Results:

  • YY1 silencing significantly reduced p73 promoter activity and endogenous p73 expression.
  • YY1 overexpression enhanced p73 promoter activity.
  • YY1 and E2F1 demonstrated a synergistic effect on p73 promoter activity.
  • Both YY1 and E2F1 were found to be involved in doxorubicin-induced p73 promoter activation.
  • YY1 and E2F1 physically interact within the nucleus.

Conclusions:

  • YY1 and E2F1 cooperatively regulate p73 transcription through direct physical interaction.
  • This cooperative mechanism represents a novel regulatory pathway involving the YY1 network.
  • Findings offer new insights into the regulation of p73 in tumorigenesis, differentiation, and development.

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