AtaGenix Laboratories
AtaGenix Laboratories
Release time: 2026-03-27 View volume: 10
Stable cell line development is essential for consistent, long-term recombinant protein and antibody production. The choice of CHO host cell and selection system directly impacts expression level, timeline, and scalability. This guide compares the three most common selection systems and helps you choose the right one.
Transient expression delivers protein fast (2–4 weeks) but yields vary batch-to-batch and aren’t sustainable long-term. Stable cell lines integrate the transgene into the host genome, providing consistent expression over 60+ generations with documented monoclonality — required for manufacturing, regulatory filings, and any project needing reproducible, high-titer production.
| Feature | G418 / Neomycin | DHFR / MTX | GS / MSX |
|---|---|---|---|
| Selection Mechanism | Antibiotic resistance | Gene amplification (MTX pressure) | Metabolic selection (glutamine deprivation) |
| Host Cell | CHO-K1 or any CHO | CHO-DG44 (DHFR−/−) | CHO-K1 or CHO-S |
| Expression Level | Moderate | High (amplification) | High (stringent selection) |
| Selection Speed | Fast (2–3 weeks) | Slow (multiple amplification rounds) | Moderate (4–6 weeks) |
| Gene Copy Amplification | No | Yes (MTX-driven) | No (but high per-copy expression) |
| Stability | Good | Risk of instability without selection pressure | Excellent (≥60 generations) |
| Best For | Research-grade lines, fast screening | High-expression, gene amplification needed | Manufacturing, regulatory, high-producer isolation |
Total timeline is approximately 12 weeks from kickoff to Research Cell Bank (RCB). Deliverables include monoclonality documentation, stability data (≥60 generations), RCB, and full IP ownership transfer. AtaGenix supports all three selection systems with CHO-K1 and DG44 host cells.
Ready to develop a stable CHO cell line for your protein or antibody? AtaGenix delivers clonally-derived production lines in ~12 weeks with documented monoclonality and stability.
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