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c-Myc is a universal amplifier of expressed genes in lymphocytes and embryonic stem cells

Zuqin Nie1, Gangqing Hu, Gang Wei

  • 1Laboratory of Pathology, NCI, Bethesda, MD 20892, USA.

Cell
|October 2, 2012
PubMed

Insights

The c-Myc protein amplifies gene expression, not simply turning genes on or off. This finding offers a unifying principle for understanding c-Myc

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The c-Myc (Myc) protein, a transcription factor, plays a crucial role in cell growth, proliferation, and apoptosis.
  • Understanding Myc's regulatory mechanisms is vital due to its involvement in both normal physiological processes and pathological conditions like cancer.
  • Current knowledge lacks a unifying principle to explain the diverse functions of Myc, partly due to an incomplete understanding of its target genes.

Purpose of the Study:

  • To elucidate the regulatory role of the c-Myc protein in gene expression.
  • To identify a unifying principle governing Myc's function in gene regulation.
  • To investigate Myc's action in a system with temporal and physiological regulation.

Main Methods:

  • Comparative analysis of transcriptomes and genome-wide distributions of Myc, RNA polymerase II, and chromatin modifications.
  • Study conducted during lymphocyte activation and in embryonic stem (ES) cells.
  • Quantitative analysis of gene expression patterns.

Main Results:

  • Myc acts as a nonlinear amplifier of gene expression, rather than an on/off switch.
  • Myc universally targets actively transcribed genes.
  • Immediate early genes, strongly induced before Myc, are an exception to this rule.

Conclusions:

  • A simple, unifying rule for Myc action has been identified: nonlinear amplification of gene expression at active genes.
  • This rule explains a significant portion of observed Myc biology.
  • Further research can build upon this principle to understand Myc's multifaceted roles in cellular processes.

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