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Cell. 2012 Sep 28;151(1):56-67. doi: 10.1016/j.cell.2012.08.026.

Transcriptional amplification in tumor cells with elevated c-Myc.

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  • 1Whitehead Institute for Biomedical Research, Cambridge Center, MA 02142, USA.

Abstract

Elevated expression of the c-Myc transcription factor occurs frequently in human cancers and is associated with tumor aggression and poor clinical outcome. The effect of high levels of c-Myc on global gene regulation is poorly understood but is widely thought to involve newly activated or repressed "Myc target genes." We report here that in tumor cells expressing high levels of c-Myc the transcription factor accumulates in the promoter regions of active genes and causes transcriptional amplification, producing increased levels of transcripts within the cell's gene expression program. Thus, rather than binding and regulating a new set of genes, c-Myc amplifies the output of the existing gene expression program. These results provide an explanation for the diverse effects of oncogenic c-Myc on gene expression in different tumor cells and suggest that transcriptional amplification reduces rate-limiting constraints for tumor cell growth and proliferation.

Copyright © 2012 Elsevier Inc. All rights reserved.

Comment in

  • Tumorigenesis: Megaphone MYC. [Nat Rev Cancer. 2012]
  • All things to all people. [Cell. 2012]
PMID:
23021215
[PubMed - indexed for MEDLINE]
PMCID:
PMC3462372
Free PMC Article
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