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Retrovirus vector production and transduction: modulation by the cell cycle
Alla Dolnikov1,2, Simon Wotherspoon3,4, Michelle Millington1,2
1School of Physiology and Pharmacology, The University of New South Wales, Sydney, NSW 2052, Australia and Children's Cancer Institute, Randwick, Sydney, NSW 2031, Australia.
The Journal of General Virology
|October 24, 2003
Summary
Cell cycle modulation impacts retrovirus vector production and transduction efficiency. Optimizing cell cycle phases, particularly S phase, can enhance infectious virion production and improve transduction rates.
Area of Science:
- Molecular Biology
- Virology
- Cell Biology
Background:
- Retrovirus vectors are crucial tools in gene therapy and biological research.
- Understanding factors influencing retrovirus vector production and transduction is essential for optimizing their use.
- Previous studies indicated that some viral promoters are upregulated by cell cycle arrest, but this effect on Moloney murine leukemia virus (MMLV) LTR was unknown.
Purpose of the Study:
- To analyze the effect of cell cycle modulation on retrovirus vector production.
- To investigate the impact of cell cycle phase on retrovirus transduction efficiency.
- To determine if cell cycle synchronization can enhance retrovirus vector production and transduction.
Main Methods:
- Analysis of retrovirus vector expression across different cell cycle phases (G1, S, G2/M).
- Assessment of infectious virion production in cultures enriched for specific cell cycle phases.
- Evaluation of retrovirus transduction efficiency in synchronized and unsynchronized cell cultures.
- Investigation of Moloney murine leukemia virus (MMLV) LTR-driven expression during induced G1/S and G2/M growth arrest.
Main Results:
- Retrovirus vector expression driven by MMLV LTR was consistent across all cell cycle phases.
- Unlike other viral promoters, MMLV LTR expression was not upregulated by G1/S or G2/M growth arrest.
- Cultures enriched for S phase cells demonstrated increased production of infectious virions.
- Retrovirus transduction efficiency was limited by slow cell cycle progression and short virus half-life.
- Synchronizing cells prior to mitosis significantly increased transduction efficiency.
Conclusions:
- Cell cycle modulation offers a strategy to optimize retrovirus vector production and transduction.
- Enriching cultures for S phase cells enhances infectious virion yield.
- Cell cycle synchronization, particularly before mitosis, improves retrovirus transduction rates.
- Targeting specific cell cycle stages can shorten transduction periods and increase overall efficiency.