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G418 advice in estab;lishing stable cell line

G418 stable cell line

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#1 SujN



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Posted 02 August 2012 - 06:50 AM


I transfected CHO cell line for my gene of insert and I used G418 as selection marker(plasmid for which is seperate than plasmid for my gene of interest)

Transfection went well and I added G418 after 24 hours and I kept the cells for recovery. On 7th day I passaged cells but I forgot to add G418 and I realised it after 3 days(over the weekend). I passaged my cells and added G418 again at concentration of 550microG/mL.

Do you think I must have lost successfully transfected cells and the culture will over take with non-tranfected cells only now?
Or still can continue to recover my cells with constant selection pressure?

Please awaiting your reply.


#2 bob1


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Posted 02 August 2012 - 01:14 PM

They will probably be fine, as G418 is a pretty strong selection agent. However, if I am reading your post correctly, the G418 is on a separate plasmid to your gene of interest, which makes it quite unlikely that your gene will be selected for, so don't be too surprised to find a very low number of integrants.

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