Abstract
The feasibility of using rainbow trout Oncorhynchus mykiss embryos as an expression system for proteins was investigated. For model proteins, we selected two goldfish gonadotropins (GTHs), follicle-stimulating hormone (FSH) and luteinizing hormone (LH). To produce single-chain goldfish FSH (scgfFSH) and LH (scgfLH), cDNAs encoding glycoprotein hormone (GP) α and FSHβ were fused in tandem, and cDNAs encoding GPα and LHβ were fused in tandem. The fused cDNAs were ligated with β-actin promoter, and microinjected into fertilized rainbow trout eggs. After 4-days incubation, the embryos were subjected to western blotting and in vitro bioassays. The recombinant proteins produced by the embryos were immunoreactive to antisera against goldfish GPα, N-glycosylated, and biologically active. We conclude that scgfFSH and scgfLH were successfully produced in transgenic rainbow trout.
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