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Updated: Aug 15, 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

The interferon-inducible gene, Ifi204, acquires malignant transformation capability upon mutation at the Rb-binding

Marco De Andrea1, Monica Ravotto, Emanuela Noris

  • 1Department of Public Health and Microbiology, Medical School, Via Santena 9, 10126, Turin, Italy.

FEBS Letters
|April 12, 2002
PubMed

Insights

Mutated p204 protein, lacking functional retinoblastoma (Rb) binding sites, gains oncogenic properties. This protein promotes cell growth, immortalization, and tumor formation, indicating a potential role in cancer development.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Retinoblastoma (Rb) protein is a key tumor suppressor.
  • The role of p204 in Rb-mediated cell cycle control and transformation is not fully understood.

Purpose of the Study:

  • To investigate the oncogenic potential of p204 when its retinoblastoma (Rb)-binding sites are mutated.
  • To determine if p204, lacking functional Rb interaction, can induce malignant transformation.

Main Methods:

  • Stable transfection of NIH3T3 cells with a double-mutant p204 expression vector (p204dm).
  • Analysis of cell transformation markers including soft agar colony formation, low-serum growth, tumor formation in athymic nude mice, and telomerase activity.

Main Results:

  • p204dm-expressing cells showed increased foci formation in cell focus assays.
  • Enhanced colony formation in soft agar and growth under low-serum conditions were observed.
  • p204dm-transfected cells formed tumors in vivo and exhibited significantly higher telomerase activity.

Conclusions:

  • p204, when its Rb-binding motifs are non-functional, acquires oncogenic capabilities.
  • These findings suggest that p204 can contribute to malignant transformation and tumor development.

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