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Evaluating Apoptotic Gene Efficiency for CHO Culture Performance Using Targeted Integration
David Catalán-Tatjer1, Saravana Kumar Ganesan1, Iván Martínez-Monje1
1The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Lyngby 2800, Denmark.
ACS Synthetic Biology
|April 23, 2025
Summary
Overexpressing Chinese hamster ovary (CHO) bcl-2 significantly improved biopharmaceutical production. This study established a targeted gene integration method to overcome challenges in metabolic engineering for cell culture performance.
Area of Science:
- Biotechnology
- Cell Biology
- Bioprocessing
Background:
- Chinese hamster ovary (CHO) cells are crucial for biopharmaceutical production, but cell death limits culture performance.
- Apoptosis (programmed cell death) is a key factor affecting CHO cell culture duration and density.
- Previous studies faced challenges due to clonal variation from random gene integration.
Purpose of the Study:
- To develop isogenic CHO cell lines for studying antiapoptotic genes.
- To identify specific antiapoptotic genes that enhance biopharmaceutical production.
- To establish a reliable method for testing candidate genes in CHO cell engineering.
Main Methods:
- Utilized recombinase-mediated cassette exchange to create isogenic CHO cell lines expressing erythropoietin and various antiapoptotic genes (bcl-2, bcl-xL, mcl-1, bhrf-1).
- Tested cell lines in batch cultures with sodium butyrate and in fed-batch using the ambr15 microbioreactor system.
- Employed multiplexed quantitative proteomics to characterize metabolic differences.
Main Results:
- Overexpression of CHO-origin bcl-2 significantly enhanced productivity.
- Phenotypic variations were observed depending on the specific antiapoptotic gene overexpressed.
- A methodology for targeted gene testing was successfully established.
Conclusions:
- Targeted integration of antiapoptotic genes, specifically CHO bcl-2, can improve CHO cell culture productivity.
- The developed methodology enables more comparable metabolic engineering strategies.
- This research overcomes previous challenges associated with clonal variation in CHO cell line development.
