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Related Experiment Videos

c-Myc-regulated microRNAs modulate E2F1 expression.

Kathryn A O'Donnell1, Erik A Wentzel, Karen I Zeller

  • 1Program in Human Genetics and Molecular Biology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.

Nature
|June 10, 2005
PubMed
Summary
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The proto-oncogene c-MYC transcription factor directly activates a cluster of six microRNAs (miRNAs) that regulate cell proliferation. These miRNAs, in turn, help control the expression of E2F1, a key cell cycle regulator.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Biology

Background:

  • MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression post-transcriptionally.
  • Dysregulation of the c-MYC proto-oncogene is implicated in numerous human cancers.
  • Identifying transcription factors that control miRNA expression is crucial for understanding cellular regulation.

Purpose of the Study:

  • To investigate the role of the c-MYC transcription factor in regulating microRNA expression.
  • To identify specific miRNAs regulated by c-MYC.
  • To elucidate the functional relationship between c-MYC, miRNAs, and cell cycle regulators like E2F1.

Main Methods:

  • Chromatin immunoprecipitation (ChIP) to assess c-MYC binding to miRNA loci.
  • Analysis of miRNA expression levels in response to c-MYC.

Related Experiment Videos

  • Validation of miRNA-mediated regulation of target genes (E2F1).

    • Main Results:

    • c-MYC directly binds to and activates a cluster of six miRNAs located on human chromosome 13.
    • Expression of the transcription factor E2F1, a promoter of cell cycle progression, is negatively regulated by miR-17-5p and miR-20a from this cluster.
    • This reveals a feedback mechanism where c-MYC controls both the activation of specific miRNAs and the translational repression of a key target, E2F1.

    Conclusions:

    • c-MYC plays a direct role in regulating miRNA biogenesis and function.
    • A novel regulatory network is identified where c-MYC modulates cell proliferation through miRNA-mediated control of E2F1.
    • This finding expands the known targets of c-MYC and provides insights into cancer-related gene regulation.