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Relative quantitative RT-PCR protocol for TrkB expression in neuroblastoma using GAPD as an internal control
A Eggert1, G M Brodeur, N Ikegaki
1Children's Hospital of Philadelphia, PA, USA.
Biotechniques
|April 19, 2000
Summary
This study presents a refined RT-PCR method for accurately measuring TrkB gene expression using glyceraldehyde-3-phosphate-dehydrogenase (GAPD) as a control. A novel primer modification overcomes signal detection issues for reliable gene expression analysis.
Area of Science:
- Molecular Biology
- Gene Expression Analysis
Background:
- Quantitative measurement of TrkB transcripts is crucial for understanding its biological roles.
- Standard RT-PCR methods can face challenges with signal detection and accurate ratio determination.
Purpose of the Study:
- To develop an optimized RT-PCR protocol for the relative quantitative measurement of TrkB transcripts.
- To address signal overexposure issues encountered with internal controls like GAPD.
Main Methods:
- Co-amplification of TrkB and GAPD transcripts using 5'-biotinylated primers.
- PAGE, electro-transfer to nylon membrane, and chemiluminescent detection.
- Modification of GAPD primers to a mixture of biotinylated and non-biotinylated primers to control signal intensity.
Main Results:
- The modified primer approach successfully prevented X-ray film overexposure, allowing for accurate densitometry analysis.
- TrkB and GAPD signals were within the linear detection range without compromising TrkB amplification efficiency.
- The modified protocol enables reliable normalization of TrkB transcript levels.
Conclusions:
- A modified RT-PCR protocol using composite primers offers improved accuracy for quantitative gene expression analysis.
- This technique provides a robust method for measuring TrkB transcript levels relative to GAPD.
- The composite primer strategy has broad applicability in nucleic acid quantification.