Optimised mammalian expression through the coupling of codon adaptation with gene amplification: maximum yields with...

Area of Science:

• Biotechnology
• Molecular Biology
• Cell Engineering

Background:

• Gene amplification is common for high-yield recombinant protein production in mammalian cells.
• Traditional methods are time-consuming and can lead to unstable clones due to genomic rearrangements.
• The dihydrofolate reductase (DHFR)/methotrexate (MTX) system is a widely used amplification strategy.

Purpose of the Study:

• To improve the efficiency and speed of the DHFR/MTX gene amplification process.
• To investigate the synergistic effect of combining gene amplification with advanced codon optimization.
• To achieve rapid expression saturation without compromising final recombinant protein yields.

Main Methods:

• Utilized the DHFR/MTX gene amplification system in engineered CHO host cells.
• Implemented highly optimized codon strategies for recombinant protein expression.
• Assessed expression levels at varying concentrations of methotrexate (MTX).

Main Results:

• Demonstrated significant synergy between gene amplification and codon optimization.
• Achieved rapid expression saturation at low MTX concentrations (as low as 5 nM).
• Maintained high final yields of recombinant proteins with minimal effort.

Conclusions:

• The combined approach significantly accelerates recombinant protein production.
• High codon optimization enhances the DHFR/MTX gene amplification system.
• This improved methodology offers a faster, more efficient way to generate high-producing, stable cell lines.