title: Transgene expression of enhanced green fluorescent protein in cloned rabbits generated from in vitro-transfected adult fibroblasts.
abstract: Live rabbits have previously been generated through nuclear transfer using adult cells as nuclear donors. We demonstrated in this study that transfected adult rabbit fibroblasts are also capable of supporting full-term development. The fibroblasts were transfected with a pEGFP-C1 plasmid using lipofectamine() 2000, and the transgenic cells were derived from conditioned medium. The transgenic fibroblasts were cultured until confluent and then serum-starved prior to be used as nuclear donors. After nuclear transfer and activation, 22% (12/55) of the transgenic cloned embryos developed to the blastocyst stage. A total of 114 embryos at the 4- to 8-cell stage were transferred to the oviducts of 8 pseudo-pregnant mothers; 5 of these animals became pregnant, and 3 of the 5 mother rabbits carried the pregnancy to term. Caesarean section was performed on the 3 pregnant mothers, yielding 4 kits, one of which has survived for more than 9 months. Green fluorescence could be detected in the toenails of the living cloned rabbit and the offspring from the living cloned rabbit under ultraviolet light. DNA analyses confirmed that all 4 cloned rabbits were genetically identical to the transgenic donor cells, and that they all carried the EGFP gene. The present study demonstrated that transgenic rabbits can be generated through nuclear transfer. These results may facilitate future developments in the genetic engineering of rabbits.
authors.affiliation: National Center for Molecular Genetics and Breeding of Animal, Institute of Animal Sciences, Chinese Academy of Agriculture Sciences, 100094 Beijing, China. Lis101@163.com
authors.forename: Shangang
authors.initials: S
authors.lastname: Li
authors.forename: Yi
authors.initials: Y
authors.lastname: Guo
authors.forename: Jianjun
authors.initials: J
authors.lastname: Shi
authors.forename: Chunguang
authors.initials: C
authors.lastname: Yin
authors.forename: Fengying
authors.initials: F
authors.lastname: Xing
authors.forename: Lingyang
authors.initials: L
authors.lastname: Xu
authors.forename: Chuanshan
authors.initials: C
authors.lastname: Zhang
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.forename: Yao
authors.initials: Y
authors.lastname: Li
authors.forename: Hongbin
authors.initials: H
authors.lastname: Li
authors.forename: Lixin
authors.initials: L
authors.lastname: Du
authors.forename: Xuejin
authors.initials: X
authors.lastname: Chen
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D002467:Cell Nucleus / Q000378:metabolism; D019976:Cloning, Organism / Q000379:methods*; D005347:Fibroblasts / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D005818:Genetic Engineering / Q000379:methods; D049452:Green Fluorescent Proteins / Q000378:metabolism*; D066298:In Vitro Techniques; D008055:Lipids; D018895:Microsatellite Repeats; D010957:Plasmids / Q000378:metabolism; D016133:Polymerase Chain Reaction; D011817:Rabbits; D014162:Transfection; D019076:Transgenes
chemical_list: D008055:Lipids; C086724:Lipofectamine; D049452:Green Fluorescent Proteins