Competitive reverse transcriptase-PCR: an improved method for determination of c-erbB-2 gene expression

Area of Science:

• Molecular Biology
• Oncology

Background:

• Accurate quantification of c-erbB-2 gene expression is crucial for cancer diagnosis and treatment.
• Existing methods for gene expression analysis are often time-consuming and expensive.

Purpose of the Study:

• To develop a simple and reliable method for routine analysis of c-erbB-2 gene expression in tumor samples.
• To establish an internal exogenous control for quantitative RT-PCR (Reverse Transcription Polymerase Chain Reaction).

Main Methods:

• Construction of a plasmid for in vitro synthesis of competitor RNA with distinct sequence modifications (19-base deletion, 63-base insertion) compared to wild-type c-erbB-2 mRNA.
• Utilizing RT-PCR with the competitor RNA as an internal control for quantifying c-erbB-2 expression.
• Validation of the RT-PCR system's sensitivity and reliability using cultured cells with known c-erbB-2 expression data from Northern blot analysis.

Main Results:

• The developed RT-PCR method successfully generated a distinguishable PCR product from the wild-type c-erbB-2 mRNA.
• The sensitivity and reliability of the RT-PCR system were confirmed.
• Experimental results correlated well with Northern blot hybridization data.

Conclusions:

• The established RT-PCR strategy provides a simple, sensitive, and reliable method for routine c-erbB-2 gene expression analysis.
• This approach overcomes the time-consuming and costly limitations of classical gene expression analysis techniques.
• The method is suitable for accurate quantification of c-erbB-2 in tumor samples.