Inventors:
Ronald M. Evans - La Jolla CA
Richard D. Palmiter - Seattle WA
Ralph L. Brinster - Gladwyne PA
Assignee:
The Salk Institute for Biological Studies - San Diego CA
International Classification:
C12P 2102, C12N 1500, C12N 500, C12N 100
Abstract:
Mammalian genes that encode hormones are cloned and linked to strong promoter DNA sequences. The linked sequences are inserted in plasmids for amplification in prokaryotic cells, and multiple copies of the linked sequences are excised therefrom. Linked sequences are subsequently microinjected into fertilized eggs and the fertilized eggs are implanted into pseudo-pregnent females of the same species. As a result, transgenic animals are born having the linked sequences incorporated into their genomes and expressing the gene-encoded hormone. Because multiple copies of the linked sequences are frequently inserted and because production of the hormone is not limited to certain organs, as is the case with most endogenous hormones, the transgenic animals produce substantial amounts of the hormone. Hormone can be harvested from the living animal (and from its hormone-producing progeny) by extracting fluid, such as blood serum or ascites fluid, on a regular basis.