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Quantitative analysis of CD34+ stem cells using RT-PCR on whole cells
1CellPro, Inc., Bothell, Washington 98021.
PCR Methods and Applications
|April 1, 1994
Summary
This study introduces a novel whole-cell RT-PCR method for quantifying rare cells expressing specific mRNA. This technique efficiently detects single cells and tracks CD34 mRNA in blood and bone marrow during purification.
Area of Science:
- Molecular Biology
- Cell Biology
- Hematology
Background:
- Accurate quantification of rare cell populations is crucial in biological and medical research.
- Traditional methods for detecting specific mRNA often require laborious RNA extraction.
- Identifying and tracking cells expressing specific markers, like CD34, is vital for understanding stem cell biology and disease.
Purpose of the Study:
- To develop and validate a quantitative whole-cell reverse transcription-polymerase chain reaction (RT-PCR) method for detecting rare cells expressing unique mRNA.
- To enable the detection of single cells expressing CD34 mRNA within a mixed cell population.
- To quantitatively monitor CD34 mRNA-expressing cells during multistep purification processes.
Main Methods:
- Developed a quantitative whole-cell RT-PCR technique, eliminating the need for RNA extraction.
- Utilized a limiting dilution series with multiple aliquots for enhanced statistical power in rare cell analysis.
- Employed nested amplification of CD34 mRNA to achieve single-cell detection sensitivity.
- Applied the method to track CD34 mRNA-positive cells during immunoadsorption and fluorescence-activated cell sorting (FACS).
Main Results:
- Demonstrated that whole-cell RT-PCR can be performed without prior RNA extraction, saving time and effort.
- Successfully detected single cells expressing CD34 mRNA in large cell populations.
- Quantitatively followed CD34 mRNA-expressing cells from blood and bone marrow through purification steps.
- Observed that many CD34 protein-expressing cells lacked detectable CD34 mRNA, suggesting developmental regulation.
Conclusions:
- Whole-cell RT-PCR offers an efficient and quantitative approach for analyzing rare cell populations based on mRNA expression.
- The developed nested RT-PCR method provides high sensitivity for detecting single mRNA-expressing cells.
- This technique facilitates the quantitative tracking of specific cell populations during complex purification procedures.
- The dissociation between CD34 protein and mRNA levels indicates a developmentally regulated phenomenon in hematopoietic cells.
