Methods
The production of genetically modified animals, in which the genetic modifications are engineered in somatic cells cultured in vitro by gene targeting, is described. Genetically modified cells may then used as nuclear donors to produce, inter alia, live animals. The methods described can also be used to validate loci in animal chromosomes which are suitable sites for transgene addition to cells.
1 - 61 . (canceled)
62 . A method for producing a genetically modified ungulate, the method comprising:
(a) modifying the nuclear genome of a somatic cell with a normal karyotype at an endogenous locus by a genetic targeting event;
(b) transferring the modified nuclear genome of the somatic cell to an oocyte, two cell embryo or zygote which is capable of producing a viable nuclear transfer unit;
(c) activating the nuclear transfer unit thereby producing an embryo;
(d) transferring the embryo to a surrogate mother; and
(e) allowing the embryo to develop to term, thereby producing a genetically modified ungulate.
63 . The method of claim 62 , wherein the genetically modified ungulate is a sheep, goat, horse, or camel.
64 . The method of claim 62 , wherein the ungulate is a pig.
65 . The method of claim 62 , wherein the ungulate is a cow.
66 . The method of claim 62 , wherein the genetic targeting event is an event selected from the group consisting of: removal of a gene, inactivation of a gene, modification of a gene, upregulation of a gene, gene replacement and transgene placement.
67 . The method of claim 62 , wherein the genetic targeting event results in inactivation of a gene.
68 . The method of claim 67 , wherein the gene is the alpha-1,3-galactosyltransferase gene.
69 . The method of claim 62 , wherein the modification comprises placing a transgene in the nuclear genome, wherein the transgene becomes operably linked to an endogenous promoter.
70 . The method of claim 62 , wherein the modification comprises placing a transgene in the nuclear genome, wherein the transgene becomes operably linked to a polyadenylation signal region.
71 . The method of claim 62 , wherein the modification comprises inactivating, removing, modifying or replacing an immunoglobulin gene.
72 . The method of claim 62 , wherein the oocyte is of the same species as the somatic cell.
73 . The method of claim 62 , wherein the oocyte is a metaphase II oocyte.
74 . The method of claim 62 , wherein the surrogate mother is of the same species as the embryo.
75 . The method of claim 62 , wherein the genetic targeting event is initiated by transfection of the somatic cell via lipofection or electroporation.
76 . The method of claim 62 , wherein the somatic cell is an epithelial cell, a fibroblast cell, or an endothelial cell.
77 . The method of claim 62 , wherein the somatic cell is a fibroblast cell or an epithelial cell.
78 . The method of claim 62 , further comprising breeding the genetically modified ungulate to produce genetically modified offspring from the genetically modified ungulate.
79 . A method for producing a genetically modified ungulate, the method comprising:
(a) modifying the nuclear genome of a somatic cell with a normal karyotype at an endogenous locus by a genetic targeting event;
(b) transferring the modified nuclear genome of the somatic cell to an oocyte, two cell embryo or zygote which is capable of producing a viable nuclear transfer unit;
(c) activating the nuclear transfer unit thereby producing an embryo;
(d) transferring the embryo to a surrogate mother;
(e) deriving cells from the embryo or fetus;
(f) transferring the nuclear genome of a derived cell to an oocyte, two cell embryo or zygote which is capable of producing a nuclear transfer unit;
(g) activating the nuclear transfer unit thereby producing an embryo;
(h) transferring the embryo to a surrogate mother which is a suitable host; and
(i) allowing the embryo to develop to term, thereby producing a genetically modified ungulate.
80 . The method of claim 79 , wherein the genetically modified ungulate is a sheep, goat, horse, or camel.
81 . The method of claim 79 , wherein the ungulate is a pig.
82 . The method of claim 79 , wherein the ungulate is a cow.
83 . The method of claim 79 , wherein the genetic targeting is an event selected from the group consisting of: removal of a gene, inactivation of a gene, modification of a gene, upregulation of a gene, gene replacement and transgene placement.
84 . The method of claim 79 , wherein the genetic targeting event results in inactivation of a gene.
85 . The method of claim 84 , wherein the gene is the alpha-1,3-galactosyltransferase gene.
86 . The method of claim 79 , wherein the modification comprises placing a transgene in the nuclear genome, wherein the transgene becomes operably linked to an endogenous promoter.
87 . The method of claim 79 , wherein modification comprises placing a transgene in the nuclear genome, wherein the transgene becomes operably linked to a polyadenylation signal region.
88 . The method of claim 79 , wherein the modification comprises inactivating, removing, modifying or replacing an immunoglobulin gene.
89 . The method of claim 79 , wherein the oocyte is of the same species as the somatic cell.
90 . The method of claim 79 , wherein the surrogate mother is of the same species as the embryo.
91 . The method of claim 79 , wherein the oocyte is a metaphase II oocyte.
92 . The method of claim 79 , wherein the genetic targeting event in the somatic cell is initiated by transfection of the somatic cell via electroporation or lipofection.
93 . The method of claim 79 , wherein the somatic cell is an epithelial cell, a fibroblast cell, or an endothelial cell.
94 . The method of claim 79 , wherein the somatic cell is a fibroblast cell or epithelial cell.
95 . The method of claim 79 , further comprising breeding the genetically modified ungulate to produce genetically modified offspring from the genetically modified ungulate.
96 . The method of claim 79 , wherein the derived cell is genetically modified prior to being used as a donor cell for nuclear transfer.
97 . A method for producing a genetically modified ungulate, the method comprising:
(a) modifying the nuclear genome of a somatic cell with a normal karyotype at an endogenous locus by a genetic targeting event, wherein the endogenous locus is the alpha-1,3-galactosyltransferase locus;
(b) transferring the modified nuclear genome of the somatic cell to an oocyte, two cell embryo or zygote which is capable of producing a viable nuclear transfer unit;
(c) activating the nuclear transfer unit thereby producing an embryo;
(d) transferring the embryo to a surrogate mother; and
(e) allowing the embryo to develop to term, thereby producing a genetically modified ungulate.
98 . A method for producing genetically modified ungulate cells for nuclear transfer, the method comprising:
(a) modifying the nuclear genome of a somatic cell with a normal karyotype at an endogenous locus by a genetic targeting event;
(b) transferring the modified nuclear genome of the somatic cell to an oocyte, two cell embryo or zygote which is capable of producing a viable nuclear transfer unit;
(c) activating the nuclear transfer unit thereby producing an embryo;
(d) transferring the embryo to a surrogate mother;
(e) deriving cells from the embryo or fetus, which derived cells are suitable for use in nuclear transfer.