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Determination of Immune Cell Identity and Purity Using Epigenetic-Based Quantitative PCR
Published on: February 19, 2020
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Optimization of a quantitative PCR based method for plasmid copy number determination in human cell lines
Lukas Fliedl1, Florian Kast1, Johannes Grillari2
1ACIB, Muthgasse 18, A-1190 Vienna, Austria.
New Biotechnology
|March 23, 2015
Summary
Optimized qPCR accurately measures plasmid copy number (PCN) in transient gene expression (TGE). New kidney cell lines show competitive PCN and productivity, aiding biopharmaceutical development.
Area of Science:
- Biotechnology
- Molecular Biology
- Biopharmaceutical Development
Background:
- Transient gene expression (TGE) is crucial for rapid recombinant protein production in biopharmaceutical research.
- Increasing identification of drug targets necessitates faster protein production for early-stage testing.
- Plasmid copy number (PCN) is a key factor influencing the efficiency of TGE.
Purpose of the Study:
- To develop and present an optimized quantitative PCR (qPCR) protocol for accurate measurement of PCN.
- To analyze the dynamics of PCN over time in a common cell line used for TGE.
- To compare the TGE performance of novel human kidney cell lines against established cell lines.
Main Methods:
- Development of an optimized qPCR-based protocol for PCN quantification.
- Monitoring PCN levels in HEK293 cells over a 5-day period post-transfection.
- Comparative analysis of PCN and specific productivity in HEK293, RS, and RPTEC/TERT1 cell lines.
Main Results:
- A significant decrease in PCN was observed in HEK293 cells, from 606,000 to 4560 copies per cell within 5 days.
- Two novel human kidney cell lines (RS and RPTEC/TERT1) demonstrated competitive PCN and specific productivity compared to HEK293 cells.
- The study highlights the variability and decline of PCN in standard TGE systems.
Conclusions:
- The optimized qPCR protocol provides a reliable method for PCN analysis in TGE.
- Novel kidney cell lines offer promising alternatives for efficient recombinant protein production.
- Further research into plasmid DNA trafficking and degradation is needed to enhance TGE systems and design more stable plasmids for high-yield expression.
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