Methods for injecting avian eggs
The present invention provides improved methods of injecting an avian egg containing an embryo, preferably an early embryo (e.g., a blastoderm). The methods of the invention may be used to deliver a substance to an egg, remove a sample from an egg, and/or to insert a detector device into an egg to collect information therefrom. In preferred embodiments, the invention is used to deliver a substance to the embryo in ovo. In other preferred embodiments, the invention is used to produce chimeric or transgenic avian embryos in ovo.
1. An avian egg processing method, comprising:
orienting an avian egg containing a blastoderm in a predetermined position;
introducing a small opening into a shell of the egg;
introducing a small opening in an outer shell membrane of the egg under the small opening in the egg shell; and then
extending a device through the small openings in the egg shell and the outer shell membrane so as to pierce an inner shell membrane with the device, wherein the inner shell membrane is essentially intact prior to inserting the device therethrough; and
retracting the device from the egg.
2. The method of claim 1 , wherein the device is a delivery device and the method further comprises the step, following said piercing step, of releasing a substance through the delivery device and depositing the substance into the egg.
3. The method of claim 2 , wherein the device is a multiple injection delivery device.
4. The method of claim 2 , wherein the substance to be deposited in the egg comprises a polypeptide.
5. The method of claim 4 , wherein the polypeptide is selected from the group consisting of an antibody, hormone, growth factor, enzyme and cytokine.
6. The method of claim 2 , wherein the substance to be to deposited in the egg comprises a nucleotide sequence.
7. The method of claim 6 , wherein the nucleotide sequence is introduced into the blastoderm using a method selected from the group consisting of a viral vector, liposomes and electroporation.
8. The method of claim 6 , wherein the nucleotide sequence encodes a polypeptide or an antisense nucleic acid.
9. The method of claim 2 , wherein the substance to be deposited in the egg comprises an antibiotic.
10. The method of claim 2 , wherein the substance to be deposited in the egg comprises a donor cell.
11. The method of claim 10 , wherein the donor cell is an avian cell.
12. The method of claim 11 , wherein the donor cell is selected from the group consisting of a chicken, turkey, duck, goose, quail, pheasant, parakeet, parrot, cockatoo, cockatiel, ostrich and emu cell.
13. The method of claim 11 , wherein the donor cell is from a different avian species than the species of the blastoderm.
14. The method of claim 10 , wherein the donor cell is a transgenic cell.
15. The method of claim 10 , wherein the donor cell is selected from the group consisting of a blastodermal cell, stem cell, cultured stem cell, embryonic stem cell, primordial germ cell, embryonic germ cell, and any combination of the foregoing.
16. The method of claim 10 , wherein the blastoderm is a chicken blastoderm and the donor cell is a chicken cell.
17. The method of claim 16 , wherein the blastoderm and the donor cell are from different breeds or strains of chicken.
18. The method of claim 1 , wherein the device is a sampling device and the method further comprises the step, following said piercing step, of removing a sample from the egg.
19. The method of claim 18 , wherein the sample removed from the egg comprises subgerminal cavity fluid.
20. The method of claim 18 , wherein the sample removed from the egg comprises blastodermal cells.
21. The method of claim 1 , wherein the device is a detector device and the method further comprises the step, following said piercing step, of detecting with the detector device information from the interior of the egg.
22. The method of claim 21 , wherein the detector device is an electrical sensor.
23. The method of claim 21 , wherein the detector device is an optical sensor.
24. The method of claim 21 , wherein the detector device is a chemical sensor.
25. The method of claim 21 , wherein the detector device is a temperature sensor.
26. The method of claim 21 , wherein the detector device is an acoustic sensor.
27. The method of claim 21 , wherein the detector device is a pressure sensor.
28. The method of claim 1 , wherein the device is extended through the small opening in the egg shell to a predetermined location.
29. The method of claim 1 , wherein the device is extended through the small opening in the egg shell to a location in the blastoderm or in close proximity thereto.
30. The method of claim 29 , wherein the device is extended through the small opening in the egg shell to a location selected from the group consisting of:
(a) the subgerminal cavity,
(b) between the area opaca and the vitelline membrane,
(c) between the area pellucida and the vitelline membrane,
(d) between the area opaca and the area pellucida,
(e) in the area pellucida,
(f) in the area opaca, and
(g) any combination of (a) to (f) above.
31. The method of claim 1 , further comprising the step of compromising the blastodem.
32. The method of claim 1 , wherein the egg is oriented in a generally horizontal position and the small opening in the egg shell is introduced into the upward facing side of the egg.
33. The method of claim 1 , wherein the egg has been stored prior to treatment.
34. The method of claim 1 , wherein the blastoderm is a stage XIII (Eyal-Giladi & Kochav) or earlier blastoderm.
35. The method of claim 34 , wherein the blastoderm is a stage VIII to stage XIII (Eyal-Giladi & Kochav) blastoderrn.
36. The method of claim 34 , wherein the blastoderm is a stage X (Eyal-Giladi & Kochav) blastoderm.
37. The method of claim 1 , wherein the egg is selected from the group consisting of a chicken, turkey, duck, goose, quail, pheasant, parakeet, parrot, cockatoo, cockatiel, ostrich and emu egg.
38. The method of claim 37 , wherein the egg is a chicken egg.
39. The method of claim 37 , wherein the egg is a turkey egg.
40. The method of claim 1 , wherein the blastoderm comprises a heterologous nucleic acid.
41. The method of claim 1 , further comprising the step of steering the blastoderm to a desired location.
42. The method of claim 41 , wherein said steering step comprises a method selected from the group consisting of:
(a) agitating the egg,
(b) heating the egg,
(c) holding the egg in a fixed position,
(d) chemical treatment of the egg, and
(e) any combination of (a) to (d) above.
43. The method of claim 1 , further comprising the step of determining the location of the blastoderm or a compartment therein.
44. The method of claim 43 wherein said determining step comprises visualizing the blastoderm.
45. The method of claim 43 , wherein said determining step comprises determining the location of the blastoderm or a compartment therein with a detector device.
46. The method of claim 1 , further comprising the step of sealing the small opening in the egg shell.
47. The method of claim 1 , further comprising the step of incubating the egg until hatch.
48. An avian egg processing method, comprising:
orienting a blunt end of an avian egg in a predetermined position, the avian egg containing (i) a blastoderm and (ii) an air cell;
introducing a small opening into a shell of the egg at the blunt end of the egg over the air cell;
introducing a small opening in an outer shell membrane under the small opening in the egg shell; and then
extending a delivery device through the small openings in the egg shell and the outer shell membrane so as to pierce an inner shell membrane with the delivery device, wherein the inner shell membrane is essentially intact prior to inserting the delivery device therethrough;
releasing a substance through the delivery device and depositing the substance in a location in the blastoderm or in close proximity thereto; and
retracting the delivery device from the egg.
49. The method of claim 48 , wherein said orienting step comprises placing the blunt end of the egg in a generally upward position.
50. The method of claim 48 , wherein the small opening in the egg shell at the blunt end of the egg is introduced in a predetermined location.
51. The method of claim 50 , wherein the predetermined location is in substantially the center of the air cell.
52. The method of claim 48 , wherein said steps of introducing a small opening in the egg shell and the outer shell membrane are carried out essentially concurrently.
53. The method of claim 48 , further comprising the step of determining the location of the blastoderm prior to said releasing step.
54. The method of claim 48 , wherein the delivery device is extended through the small opening in the egg shell to a location selected from the group consisting of:
(a) the subgerminal cavity,
(b) between the area opaca and the vitelline membrane,
(c) between the area pellucida and the vitelline membrane,
(d) between the area opaca and the area pellucida,
(e) in the area pellucida,
(f) in the area opaca, and
(g) any combination of (a) to (f) above.
55. An avian egg processing method, comprising:
orienting a plurality of avian eggs in a predetermined position, wherein each egg contains a blastoderm;
introducing a small opening into a shell of each egg;
introducing a small opening in an outer shell membrane of each egg under the small opening in the egg shell; and then
extending a delivery device through the openings in each egg shell and outer shell membrane so as to pierce an inner shell membrane of each egg with the delivery device, wherein the inner shell membrane is essentially intact prior to inserting the delivery device therethrough;
releasing a substance through the delivery device and depositing the substance in a location in the blastoderm or in close proximity thereto in each egg; and
retracting the delivery device from each egg.
56. The method of claim 55 , further comprising the step of incubating the plurality of eggs to hatch.
57. The method of claim 56 , wherein a resulting hatch rate is at least about 50%.
58. The method of claim 56 , wherein a resulting hatch rate is at least about 65%.
59. An avian egg processing method, comprising:
orienting a blunt end of an avian egg in a predetermined position, the avian egg containing (i) a blastoderm and (ii) an air cell;
introducing a small opening into a shell of the egg at the blunt end of the egg over the air cell;
introducing a small opening in an outer shell membrane under the small opening in the egg shell; and then
extending a sampling device through the small openings in the egg shell and the outer shell membrane so as to pierce an inner shell membrane with the sampling device, wherein the inner shell membrane is essentially intact prior to inserting the sampling device therethrough;
removing a sample from the blastoderm with the sampling device; and
retracting the sampling device from the egg.
60. An avian egg processing method, comprising:
orienting a blunt end of an avian egg in a predetermined position, the avian egg containing (i) a blastoderm and (ii) an air cell;
introducing a small opening into a shell of the egg at the blunt end of the egg over the air cell;
introducing a small opening in an outer shell membrane under the small opening in the egg shell; and then
extending a detector device through the small openings in the egg shell and the outer shell membrane so as to pierce an inner shell membrane with the detector device, wherein the inner shell membrane is essentially intact prior to inserting the detector device therethrough;
detecting with the detector device information from the interior of the egg; and
retracting the detector device from the egg.