title: Deletion of the alpha(1,3)galactosyl transferase (GGTA1) gene and the prion protein (PrP) gene in sheep.
abstract: Nuclear transfer offers a cell-based route for producing precise genetic modifications in a range of animal species. Using sheep, we report reproducible targeted gene deletion at two independent loci in fetal fibro-blasts. Vital regions were deleted from the alpha(1,3)galactosyl transferase (GGTA1) gene, which may account for the hyperacute rejection of xenografted organs, and from the prion protein (PrP) gene, which is directly associated with spongiform encephalopathies in humans and animals. Reconstructed embryos were prepared using cultures of targeted or nontargeted donor cells. Eight pregnancies were maintained to term and four PrP-/+ lambs were born. Although three of these perished soon after birth, one survived for 12 days. These data show that lambs carrying targeted gene deletions can be generated by nuclear transfer.
authors.affiliation: Department of Gene Expression and Development, Roslin Institute, Roslin, Midlothian EH25 9PS, United Kingdom.
authors.forename: C
authors.initials: C
authors.lastname: Denning
authors.forename: S
authors.initials: S
authors.lastname: Burl
authors.forename: A
authors.initials: A
authors.lastname: Ainslie
authors.forename: J
authors.initials: J
authors.lastname: Bracken
authors.forename: A
authors.initials: A
authors.lastname: Dinnyes
authors.forename: J
authors.initials: J
authors.lastname: Fletcher
authors.forename: T
authors.initials: T
authors.lastname: King
authors.forename: M
authors.initials: M
authors.lastname: Ritchie
authors.forename: W A
authors.initials: WA
authors.lastname: Ritchie
authors.forename: M
authors.initials: M
authors.lastname: Rollo
authors.forename: P
authors.initials: P
authors.lastname: de Sousa
authors.forename: A
authors.initials: A
authors.lastname: Travers
authors.forename: I
authors.initials: I
authors.lastname: Wilmut
authors.forename: A J
authors.initials: AJ
authors.lastname: Clark
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D000831:Animals, Newborn; D015139:Blotting, Southern; D002467:Cell Nucleus / Q000378:metabolism; D005091:Exons; D005347:Fibroblasts / Q000378:metabolism; D005700:Galactosyltransferases / Q000235:genetics*; D017353:Gene Deletion; D018390:Gene Targeting; D018014:Gene Transfer Techniques; D008957:Models, Genetic; D011328:Prions / Q000235:genetics*; D012756:Sheep; D013997:Time Factors; D014162:Transfection
chemical_list: D011328:Prions; D005700:Galactosyltransferases; C047006:N-acetyllactosaminide alpha-1,3-galactosyltransferase