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Functional identification of tumor-suppressor genes through an in vivo RNA interference screen in a mouse lymphoma

Anka Bric1, Cornelius Miething, Carl Uli Bialucha

  • 1Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.

Cancer Cell
|October 6, 2009
PubMed

Insights

Short hairpin RNAs (shRNAs) enable RNA interference (RNAi) to identify novel tumor suppressors in mice. This study highlights Rad17 as a key player in tumor suppression and oncogenic stress response, with implications for human cancer prognosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Short hairpin RNAs (shRNAs) facilitate stable gene suppression via RNA interference (RNAi).
  • Loss of tumor suppressor genes is a critical mechanism in cancer development.
  • Mouse models are valuable for studying cancer genetics and identifying therapeutic targets.

Purpose of the Study:

  • To utilize in vivo RNAi screening to identify novel tumor suppressor genes.
  • To validate candidate tumor suppressors in a mouse lymphoma model.
  • To explore the role of DNA damage response machinery in tumor suppression.

Main Methods:

  • Employing shRNAs to induce RNA interference (RNAi) in a mouse lymphoma model.
  • Selecting for shRNAs that accelerate lymphomagenesis to identify tumor suppressor candidates.
  • Validating candidate genes, including Sfrp1, Numb, Mek1, Angiopoietin 2, and Rad17.

Main Results:

  • Identified over ten candidate tumor suppressors, including Sfrp1, Numb, Mek1, and Angiopoietin 2.
  • Discovered components of the DNA damage response machinery, notably Rad17.
  • Demonstrated Rad17 acts as a haploinsufficient tumor suppressor responding to oncogenic stress.

Conclusions:

  • In vivo RNAi screens are effective for identifying tumor suppressors.
  • Validated a diverse set of novel tumor suppressors with therapeutic potential.
  • Rad17 loss correlates with poor prognosis in human cancer patients, underscoring its role in oncogenic stress response.

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