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Identification of c-myc responsive genes using rat cDNA microarray.

Q M Guo1, R L Malek, S Kim

  • 1Molecular Signaling and Oncogenesis Section, Department of Cancer and Cell Biology, Medicine Branch, Division of Clinical Science, National Cancer Institute, Bethesda, Maryland 20892, USA.

Cancer Research
|November 21, 2000
PubMed
Summary
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The study identified 198 genes responsive to c-Myc, highlighting its role in regulating macromolecular synthesis and metabolism. This suggests distinct physiological and transforming functions for c-Myc.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • c-Myc is a transcription factor regulating gene expression.
  • Understanding c-Myc's targets is crucial for deciphering its role in cellular processes.

Purpose of the Study:

  • To identify genes directly regulated by c-Myc.
  • To investigate the role of c-Myc in regulating macromolecular synthesis and metabolism.
  • To explore potential differences between physiological and ectopic c-Myc functions.

Main Methods:

  • cDNA microarray analysis was used to compare gene expression profiles.
  • Gene expression was analyzed in c-myc null and wild-type rat fibroblast cells.
  • Gene expression was also compared in reconstituted c-myc null cells versus null cells.

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Main Results:

  • 198 out of 4400 cDNA elements were found to be responsive to c-Myc.
  • Upregulated c-Myc-responsive genes included 30 ribosomal protein genes, involved in synthesis and metabolism.
  • Ectopic overexpression of c-Myc affected a different, smaller set of genes compared to physiological expression.

Conclusions:

  • c-Myc plays a significant role in regulating protein synthesis and metabolic pathways.
  • Physiological and transforming functions of c-myc may be separable based on distinct gene expression profiles.
  • Expression profiling reveals a potential new primary function for c-Myc.