Quick Definition
What is Gamma Irradiated FBS?: Gamma irradiated FBS is fetal bovine serum exposed to ionising gamma radiation (typically 25–45 kGy) to inactivate viruses, mycoplasma, and other adventitious agents. It provides an additional viral safety layer for GMP cell culture and ATMP manufacturing beyond standard QC testing.
When is gamma irradiated FBS required?
Gamma irradiated FBS is required or strongly recommended for ATMP manufacturing (CAR-T, MSC, NK cells) where viral contamination of the final cell product poses patient safety risk; GMP manufacturing where the risk assessment demands validated viral inactivation steps; and clinical trial material production under IND where regulators expect additional adventitious agent controls beyond standard lot testing.
Does irradiation affect cell culture performance?
Gamma irradiation reduces growth factor activity by 10–30% depending on dose. Some cell lines show slower growth; others perform equivalently. Always validate irradiated FBS against your non-irradiated reference lot. Hybridoma cloning efficiency and HEK293T transfection efficiency are particularly sensitive to irradiation-related growth factor reduction.
Key Facts
- Standard dose: 25–45 kGy gamma radiation from a Co-60 source
- Inactivates: BVDV, BHV-1, BRSV, PI-3, mycoplasma, most enveloped and non-enveloped viruses
- Does NOT inactivate: prions (TSE/BSE) — gamma irradiation is not a validated prion reduction step
- Growth factor activity reduced by 10–30% — may require cell line-specific optimisation
- Supplied with irradiation certificate including dose mapping and dosimetry report
- Accepted by EMA and FDA as a viral reduction step in GMP raw material risk assessment for ATMP manufacturing
Further Reading
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