Advanced stable cell line development based on REMBAC (Rapid Efficient Manifold BACulovirus Transduction).
Sophie Huber1, Sandra Diaz Sanchez1, Gordana Wozniak-Knopp Reingard Grabherr1
1BOKU University Vienna Institute of Molecular Biotechnology, Austria.
New Biotechnology
|January 30, 2026
Summary
The BacMam platform efficiently delivers genes into mammalian cells for protein production. HEK293-6E cells showed superior stable gene expression compared to Vero cells, especially with β-globin insulators.
Area of Science:
- Biotechnology
- Molecular Biology
- Cell Biology
Background:
- The BacMam platform offers scalable gene delivery for mammalian cells, crucial for recombinant protein and bionanoparticle production.
- Evaluating stable transgene expression using the REMBAC cassette in common cell lines is essential for optimizing production systems.
Purpose of the Study:
- To comprehensively assess the BacMam platform's performance for stable gene expression in HEK293-6E and Vero cells.
- To compare the efficacy of different expression cassettes, including promoter variations and regulatory elements, for enhanced protein production.
Main Methods:
- Six transient high-expression cassettes were adapted for stable expression in HEK293-6E and Vero cells.
- Constructs featured varying promoters (CMV, mutant CMV, EF-1α), introns, LTRs, β-globin insulators, antibiotic resistance genes (Hygromycin, G418), and WPRE.
- BacMam transduction was used to deliver constructs, followed by selection and analysis of stable transfectants.
Main Results:
- HEK293-6E cells demonstrated higher transduction efficiency, more stable integration events, and stronger protein expression than Vero cells.
- The inclusion of β-globin insulators significantly boosted gene expression in HEK293-6E cells, with a lesser impact observed in Vero cells.
- Specific cassette designs influenced the success rate of stable cell line generation and expression levels.
Conclusions:
- HEK293-6E cells are a more suitable host for BacMam-mediated stable gene expression compared to Vero cells.
- Genetic design elements, particularly β-globin insulators, play a critical role in enhancing transgene expression in specific cell lines.
- Optimizing cell line selection and genetic construct design is paramount for maximizing recombinant protein production using the BacMam platform.
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