Decoupling Growth and Protein Production in CHO Cells: A Targeted Approach.

Area of Science:

• Biotechnology
• Bioprocess Engineering
• Synthetic Biology

Background:

• Fed-batch cultures of Chinese Hamster Ovary (CHO) cells are standard for biotherapeutic production, especially monoclonal antibodies.
• Next-generation biotherapeutics like bispecific antibodies and fusion proteins present expression challenges with traditional fed-batch methods.
• Decoupling cell growth and protein production is a key strategy for improving yields, particularly for complex biologics.

Purpose of the Study:

• To address the limitations of current fed-batch processes for difficult-to-express biotherapeutics.
• To explore the potential of synthetic biology for decoupling cell growth and recombinant protein production.
• To propose a revisited synthetic biology approach for optimizing biomanufacturing.

Main Methods:

• Cells are cultured to high density during a growth phase without protein production.
• Recombinant protein expression is induced, and cell proliferation is halted during a dedicated production phase.
• Combines inducible gene expression systems with proliferation control strategies.

Main Results:

• Separating growth and production phases allows for efficient resource allocation towards either cell growth or protein synthesis.
• This strategy can improve cell growth characteristics and enhance the production of challenging proteins.
• Current proliferation control methods (temperature shifts, chemical agents) have variable impacts on product quality and viability.

Conclusions:

• Synthetic biology provides a targeted approach to arrest cell growth by manipulating proliferation pathways.
• This method has been largely underutilized in industrial bioproduction despite its potential.
• Recent advancements in microbial decoupling and mammalian cell engineering warrant a re-evaluation of synthetic biology for decoupling growth and production in biomanufacturing.