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Effects of Ras signaling on gene expression analyzed by customized microarrays

Oleg I Tchernitsa1, Christine Sers, Anita Geflitter

  • 1Laboratory of Function Genomics, Laboratory of Molecular Tumor Pathology, Charité, University Berlin, Berlin, Germany.

Methods in Enzymology
|June 8, 2006
PubMed

Insights

Researchers developed a Ras signaling target array (RASTA) to identify gene expression changes caused by oncogenic Ras mutations. This tool accurately identified 85% of differentially expressed genes in Ras-transformed ovarian cells.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • Ras proteins act as molecular switches in signal transduction, coupling external stimuli to cellular responses.
  • Oncogenic mutations can lock Ras proteins in an activated state, leading to neoplastic phenotypes via transcriptional alterations.
  • Previous studies lacked a consistent pattern of Ras-related transcriptional changes due to diverse methodologies and experimental conditions.

Purpose of the Study:

  • To develop a standardized tool for assessing transcriptional patterns in cells with oncogenic Ras activation.
  • To identify and characterize Ras-responsive target genes.
  • To provide a universal method for analyzing upstream and downstream effectors of Ras signaling.

Main Methods:

  • Development of the "Ras signaling target array" (RASTA), a customized oligonucleotide array targeting approximately 300 Ras-responsive genes.
  • Validation of array-based expression profiling using suppression subtractive hybridization and Northern blotting.
  • Application of RASTA to rat ovarian surface epithelial (ROSE) cells and their KRAS-transformed derivative (A2/5).

Main Results:

  • RASTA successfully identified approximately 300 Ras-responsive target genes.
  • Array-based expression profiling correctly recognized 85% of genes differentially expressed upon Ras transformation.
  • The study established a consistent method for analyzing Ras-mediated transcriptional alterations.

Conclusions:

  • The Ras signaling target array (RASTA) is a validated and universal tool for studying Ras-driven transcriptional changes.
  • RASTA facilitates the consistent assessment of gene expression profiles in various cellular contexts of Ras activation.
  • This approach aids in understanding the molecular mechanisms underlying Ras-induced neoplastic phenotypes.

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