IRES vs 2A peptide for co-expression - (May/27/2014 )

Hi

I am going to express three genes in mammalian cells, one of them is a selection marker. I am doing this based on the opinion that if all genes are expressed under one promoter the chance of false possitive clones (due to the damage to GOI unit and integration of the selecetion marker unit only ) will reduce. and also I need to have proportional expression of the other two genes as well. So I was wondering if any one has expirences with IRES, 2A or both of them. my current design is based on IRES. any suggestion would be highly appreciated.

Kind Regards

There is actually a couple of papers comparing IRES and 2A. In my hands, P2A works way better than IRES sequences in terms of stoichiometry. Particularly if you want to express three genes, IRES will be very difficult.