Avians expressing heterologous protein
View Patent ↗This invention provides vectors and methods for the stable introduction of exogenous nucleic acid sequences into the genome of avians in order to express the exogenous sequences to alter the phenotype of the avians or to produce desired proteins. In particular, transgenic avians are produced which express exogenous sequences in their oviducts and which deposit exogenous proteins into their eggs. Avian eggs that contain exogenous proteins are encompassed by this invention. The instant invention further provides novel forms of interferon and erythropoietin which are efficiently expressed in the oviduct of transgenic avians and deposited into avian eggs.
1. A avian comprising a transgene which includes a retroviral vector wherein the vector contains a heterologous coding sequence operably linked to a promoter such that the avian expresses the heterologous coding sequence in an oviduct cell of the avian wherein protein encoded by the heterologous coding sequence is present at a detectable level.
2. The avian of claim 1 wherein the avian is a chicken.
3. The avian of claim 1 wherein the heterologous coding sequence encodes a pharmaceutical protein.
4. The avian of claim 1 wherein the heterologous coding sequence encodes a cytokine.
5. The avian of claim 1 wherein the heterologous coding sequence encodes a cytokine selected from the group consisting of interferon, G-CSF and erythropoietin.
6. The avian of claim 1 wherein the heterologous coding sequence includes a signal peptide coding sequence.
7. The avian of claim 6 wherein the signal peptide directs secretion of the heterologous protein into egg white.
8. The avian of claim 1 wherein the heterologous protein is an antibody.
9. The avian of claim 1 wherein the heterologous coding sequence and the promoter are both positioned between a 5′ LTR and a 3′ LTR of the vector.
10. The avian of claim 1 wherein the transgene comprises one or more insulator elements.
11. The avian of claim 1 wherein the retroviral vector is replication deficient.
12. The avian of claim 1 wherein the transgene comprises an IRES.
13. The avian of claim 1 wherein the heterologous coding sequence is expressed in tubular gland cells.
14. The avian of claim 1 wherein protein encoded by the heterologous coding sequence is present in egg white.
15. The avian of claim 1 wherein the promoter is selected from the group consisting of a cytomegalovirus (CMV) promoter, a MDOT promoter, a rous-sarcoma virus (RSV) promoter, a murine leukemia virus (MLV) promoter, a mouse mammary tumor virus (MMTV) promoter, an ovalbumin promoter, a lysozyme promoter, a conalbumin promoter, an ovomucoid promoter, an ovomucin promoter, an ovotransferrin promoter, and segments thereof.
16. An egg produced by the avian of claim 1 .
17. A avian comprising a transgene which includes a retroviral vector containing a heterologous coding sequence encoding a human pharmaceutical protein operably linked to a promoter such that the avian expresses the heterologous coding sequence in an oviduct cell of the avian wherein the human pharmaceutical protein is present at a detectable level.
18. The avian of claim 17 wherein the avian is a chicken.
19. The avian of claim 17 wherein the heterologous coding sequence encodes an antibody.
20. The avian of claim 17 wherein the heterologous coding sequence encodes a cytokine.
21. The avian of claim 17 wherein the heterologous coding sequence is expressed in tubular gland cells.
22. The avian of claim 17 wherein protein encoded by the heterologous coding sequence is present in egg white.
23. The avian of claim 17 wherein the retroviral vector is replication deficient.
24. The avian of claim 17 wherein the heterologous coding sequence encodes a protein selected from the group consisting of interferon (IFN), erythropoietin (EPO), human growth hormone, lysozyme, beta-casein, albumin, alpha-1 antitrypsin, antithrombin III, collagen, factor VIII, factor IX, factor X, fibrinogen, insulin, lactoferrin, protein C, granulocyte colony-stimulating factor (G-CSF), granulocyte macrophage colony-stimulating factor (GM-CSF), tissue-type plasminogen activator (tPA), somatotropin, chymotrypsin and antibodies.