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Conditional Knockdown of Gene Expression in Cancer Cell Lines to Study the Recruitment of Monocytes/Macrophages to the Tumor Microenvironment
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Genomewide trapping of genes that encode secreted and transmembrane proteins repressed by oncogenic signaling

M Gebauer1, H von Melchner, T Beckers

  • 1ASTA Medica AG, Department of Cancer Research, University of Frankfurt Medical School, Frankfurt am Main, Germany.

Genome Research
|November 3, 2001
PubMed

Insights

This study developed a retroviral gene trap (U3Ceo) to identify genes repressed by oncogenic transformation. It successfully identified genes encoding secreted and transmembrane proteins involved in cancer progression and metastasis.

Area of Science:

  • Genomics
  • Molecular Biology
  • Cancer Research

Background:

  • Oncogenic transformation often involves the repression of specific genes.
  • Identifying these repressed genes can provide insights into cancer mechanisms.
  • Secreted and transmembrane proteins play crucial roles in cellular communication and metastasis.

Purpose of the Study:

  • To develop and utilize a retroviral gene trap (U3Ceo) for genome-wide screening.
  • To identify genes encoding secreted and/or transmembrane proteins repressed by oncogenic transformation.
  • To investigate the role of these genes in oncogenesis and metastatic spread.

Main Methods:

  • Construction of a retroviral gene trap (U3Ceo) with a CD2 cell surface antigen/neomycin-phosphotransferase fusion gene.
  • Screening of a mammalian genome library using insulin-like growth factor 1 (IGF-1) transformation.
  • Selection of neomycin-resistant (Neo(R)) clones expressing the CD2 antigen.
  • Molecular analysis of gene trap integrations to identify disrupted endogenous genes.

Main Results:

  • The U3Ceo gene trap preferentially disrupted genes encoding secreted and transmembrane proteins.
  • Integrations resulted in the fusion of endogenous signal sequences to the reporter gene.
  • Selection against CD2 expression identified integrations in genes repressed by IGF-1 transformation.
  • Analysis revealed captured signal sequences from proteins implicated in oncogenic transformation and metastasis.

Conclusions:

  • The U3Ceo gene trap is effective for identifying genes repressed during oncogenic transformation.
  • This method facilitates the discovery of novel genes involved in cancer progression.
  • The identified genes, particularly those encoding secreted/transmembrane proteins, are potential targets for anti-cancer therapies.

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