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Isolation of full-size mRNA from cells sorted by flow cytometry.
Journal of Biochemical and Biophysical Methods
|September 16, 1999
Summary
Researchers developed a new method to isolate intact messenger RNA (mRNA) from sorted cells, overcoming contamination issues in primary cell cultures. This technique enables accurate gene expression analysis using Northern blotting and RT-PCR.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Gene expression is crucial for cell growth and differentiation.
- Traditional methods like Northern blotting and RT-PCR are often hindered by cell contamination in primary cultures.
- Isolating intact RNA from sorted cells is challenging due to RNA degradation.
Purpose of the Study:
- To develop a reliable method for isolating intact, full-size mRNA from sorted cells.
- To overcome challenges posed by cell contamination and RNA degradation in primary cell cultures.
- To enable accurate gene expression analysis in specific cell populations.
Main Methods:
- Comparison of fixation methods (ethanol, formaldehyde) and DEPC treatment for RNA preservation.
- Optimization of cell sorting conditions with RNAse-free BSA and CaCl2.
- Validation of isolated mRNA integrity using Northern blotting and RT-PCR.
Main Results:
- Fixation with 75% ice-cold DEPC-treated ethanol for 5 minutes preserved RNA integrity.
- Optimized sorting conditions improved RNA yield by 60% compared to previous methods.
- Intact mRNA species (beta-actin) and cell cycle-dependent gene expression (cdk2, cyclin A) were successfully demonstrated.
Conclusions:
- A fast and reliable method for isolating intact mRNA from sorted cells has been established.
- This method facilitates accurate monitoring of gene expression via Northern blotting and RT-PCR.
- The technique is suitable for studies involving primary cell cultures and complex cell mixtures.