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Published on: December 31, 2014

A novel c-Myc-responsive gene, JPO1, participates in neoplastic transformation

J E Prescott1, R C Osthus, L A Lee

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

The Journal of Biological Chemistry
|October 13, 2001
PubMed

Insights

Researchers discovered JPO1, a novel gene regulated by c-Myc (a key oncogene). JPO1 plays a role in cell transformation and tumorigenesis, linking it to c-Myc

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • c-Myc is a crucial proto-oncogene implicated in cell proliferation, differentiation, and tumorigenesis.
  • Understanding c-Myc's regulatory network is vital for deciphering its role in cancer development.

Purpose of the Study:

  • To identify and characterize novel genes directly regulated by c-Myc.
  • To investigate the functional role of the identified gene, JPO1, in c-Myc-mediated cellular processes.

Main Methods:

  • Representational difference analysis (RDA) was employed to identify novel c-Myc-responsive genes.
  • Full-length JPO1 cDNA was cloned, and its protein product was characterized.
  • Functional assays, including transformation and clonogenicity assays, were performed using cell lines overexpressing JPO1 and c-Myc.

Main Results:

  • A novel c-Myc-responsive gene, JPO1, was identified and confirmed as a direct c-Myc target.
  • JPO1 mRNA is predominantly expressed in thymus, small intestine, and colon.
  • JPO1 overexpression enhanced cell clonogenicity and complemented a transformation-defective c-Myc mutant, indicating its role in c-Myc-mediated transformation.

Conclusions:

  • JPO1 is a novel direct target of c-Myc involved in cellular transformation.
  • These findings support the model where c-Myc target genes act as critical nodes in pathways leading to tumorigenesis.

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