title: Production of Prnp-/- goats by gene targeting in adult fibroblasts.
abstract: Homozygous mice devoid of functional Prnp are resistant to scrapie and prion propagation, but heterozygous mice for Prnp disruption still suffer from prion disease and prion deposition. We have previously generated heterozygous cloned goats with one allele of Prnp functional disruption. To obtain goats with both alleles of Prnp be disrupted which would be resistant to scrapie completely, a second-round gene targeting was applied to disrupt the wild type allele of Prnp in the heterozygous goats. By second-round gene targeting, we successfully disrupted the wild type allele of Prnp in primary Prnp (+/-) goat skin fibroblasts and obtained a Prnp (-/-) cell line without Prnp expression. This is the first report on successful targeting modification in primary adult somatic cells of animals. These cells were used as nuclear donors for somatic cell cloning to produce Prnp (-/-) goats. A total of 57 morulae or blastocytes developed from the reconstructed embryos were transferred to 31 recipients, which produced 7 pregnancies at day 35. At 73 days of gestation, we obtained one cloned fetus with Prnp (-/-) genotype. Our research not only indicated that multiple genetic modifications could be accomplished by multi-round gene targeting in primary somatic cells, but also provided strong evidence that gene targeting in adult cells other than fetal cells could be applied to introduce precise genetic modifications in animals without destroying the embryos.
authors.affiliation: School of Life Science and Technology, Tongji University, 1239 Si-Ping Road, Shanghai, 200092, China.
authors.forename: Caihong
authors.initials: C
authors.lastname: Zhu
authors.forename: Bei
authors.initials: B
authors.lastname: Li
authors.forename: Guohua
authors.initials: G
authors.lastname: Yu
authors.forename: Jianquan
authors.initials: J
authors.lastname: Chen
authors.forename: Huiqing
authors.initials: H
authors.lastname: Yu
authors.forename: Juan
authors.initials: J
authors.lastname: Chen
authors.forename: Xujun
authors.initials: X
authors.lastname: Xu
authors.forename: Youbing
authors.initials: Y
authors.lastname: Wu
authors.forename: Aimin
authors.initials: A
authors.lastname: Zhang
authors.forename: Guoxiang
authors.initials: G
authors.lastname: Cheng
mesh_terms: D000483:Alleles; D000818:Animals; D030801:Animals, Genetically Modified / Q000235:genetics*; D002467:Cell Nucleus / Q000378:metabolism; D019976:Cloning, Organism; D005347:Fibroblasts / Q000378:metabolism; D018390:Gene Targeting; D005821:Genetic Techniques; D005822:Genetic Vectors; D006041:Goats; D006579:Heterozygote; D008297:Male; D008957:Models, Genetic; D011328:Prions / Q000235:genetics*; D012867:Skin / Q000378:metabolism
chemical_list: D011328:Prions