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Updated: Aug 17, 2026

Focus Formation: A Cell-based Assay to Determine the Oncogenic Potential of a Gene
08:18

Focus Formation: A Cell-based Assay to Determine the Oncogenic Potential of a Gene

Published on: December 31, 2014

Proto-oncogene fos: an inducible gene

I M Verma1, R L Mitchell, P Sassone-Corsi

  • 1Salk Institute, San Diego, California 92138.

Princess Takamatsu Symposia
|January 1, 1986
PubMed

Insights

Proto-oncogene fos (c-fos) is crucial for cell growth and differentiation. Its viral counterpart, v-fos, transforms cells, but c-fos requires specific sequence removal for similar transformation, highlighting complex gene regulation.

Area of Science:

  • Molecular Biology
  • Oncogenes
  • Cellular Regulation

Background:

  • Proto-oncogene fos (c-fos) plays a role in cell growth, differentiation, and development.
  • The viral homologue, v-fos, is the transforming gene in FBJ-murine osteosarcoma virus, inducing bone tumors.
  • Viral and cellular fos proteins share nuclear localization and in vitro fibroblast transformation capabilities despite C-terminal differences.

Purpose of the Study:

  • To investigate the functional differences and regulatory mechanisms of the c-fos proto-oncogene and its viral counterpart, v-fos.
  • To identify the specific sequence requirements for c-fos mediated fibroblast transformation.
  • To elucidate the transcriptional regulation of the c-fos gene, including enhancer elements and factors influencing transcript stability.

Main Methods:

  • Comparative analysis of viral (v-fos) and cellular (c-fos) protein structures and functions.
  • In vitro fibroblast transformation assays.
  • Gene mapping to identify transcriptional enhancer and regulatory elements within the c-fos gene and its non-coding regions.

Main Results:

  • Both c-fos and v-fos proteins are nuclear and can transform fibroblasts.
  • Transformation by c-fos necessitates the deletion of a 67 base pair sequence from the 3' non-coding domain.
  • The fos gene is highly inducible by growth factors and differentiation inducers, with mapped transcriptional elements and regulatory factors.

Conclusions:

  • The c-fos proto-oncogene exhibits complex regulation, with specific sequence elements influencing its transforming activity and transcript stability.
  • Understanding fos gene regulation is critical for comprehending cell growth, differentiation, and oncogenesis.
  • Further research into the cellular factors regulating c-fos transcription can provide insights into cancer development and potential therapeutic targets.

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