Date of Original Version
We compared 2 methods of direct gene delivery into live rainbow trout Oncorhynchus mykiss tissue, with the final goal of developing DNA-based vaccines for bacterial diseases in salmonids. The introduction of plasmid constructs containing the luciferase and β-galactosidase reporter genes was achieved either by direct injection or by particle bombardment with DNA-coated gold microparticles. Luciferase expression was observed in homogenates of trout flank muscle and skin 2 d after injection of 10 to 100 pg of DNA per fish or bombardment of 1 pm gold particles coated with 5 to 25 pg DNA per fish at helium pressures ranging from 2750 to 12 400 kPa. Expression levels increased over 10 d and persisted for at least 60 d after injection. For particle bombardment, the most reproducible levels of luciferase expression were obtained with the eye as a target (83% of fish positive versus 59% of fish positive when the flank was the target). The levels of luciferase expression observed after particle bombardment were significantly lower (t-test, p < 0.02) than the levels measured after direct injection. Immunohistochemical analysis indicated β-galactosidase gene expression in muscle cells at the site of injection and in the dermis, epidermis and muscle after bombardment. These 2 methods may prove valuable for the development of a new generation of DNA-based vaccines for fish.
Gómez-Chiarri M, Livingston S, Muro-Cacho M, Sanders S, Levine R.P. (1996). Introduction of foreign genes into the tissue of living fish by direct injection and particle bombardment. Diseases of Aquatic Organisms, 27(1), 5-12.
Available at: http://dx.doi.org/10.3354/dao027005
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