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Related Experiment Videos

c-myc expression: keep the noise down!

Hye-Jung Chung1, David Levens

  • 1Laboratory of Pathology, National Cancer Institute, Bethesda, MD 20892-1500, USA.

Molecules and Cells
|November 4, 2005
PubMed
Summary
This summary is machine-generated.

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The MYC protein, crucial in cancer, regulates many genes. Its promoter has unique features, including the FUSE element and regulatory proteins, ensuring stable expression and preventing abnormal activity.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • The c-myc proto-oncogene encodes MYC, a nuclear protein frequently deregulated in human cancers.
  • MYC protein regulates 10-15% of genes, acting as both an activator and repressor.
  • The precise MYC targets driving oncogenesis and the role of aberrant expression levels versus new targets remain unclear.

Purpose of the Study:

  • To investigate the regulatory mechanisms of the c-myc promoter that ensure uniform expression.
  • To understand how promoter architecture prevents or mitigates transcriptional noise.
  • To elucidate the roles of the Far UpStream Element (FUSE) and its associated proteins (FBP, FIR) in c-myc regulation.

Main Methods:

  • Analysis of c-myc promoter structure and function.

Related Experiment Videos

  • Investigation of transcription factor interactions and feedback mechanisms.
  • Characterization of the roles of FUSE, FBP, and FIR in regulating c-myc transcription.

    • Main Results:

    • The c-myc promoter possesses architectural features promoting uniform expression.
    • These features include an expanded proximal promoter and averaging of multiple transcription factor inputs.
    • Real-time transcriptional feedback is mediated by the FUSE element and its binding proteins (FBP, FIR).

    Conclusions:

    • The c-myc promoter has evolved sophisticated mechanisms to maintain stable expression levels.
    • These mechanisms involve promoter architecture, combinatorial transcription factor control, and dynamic feedback loops.
    • The FUSE-FBP-FIR pathway is critical for enforcing normal transcription and preventing aberrant MYC activity, thereby impacting cancer development.