title: Embryo development, fetal growth and postnatal phenotype of eGFP lambs generated by lentiviral transgenesis.
abstract: Lentiviral technology has been recently proposed to generate transgenic farm animals more efficiently and easier than traditional techniques. The objective was to evaluate several parameters of lambs obtained by lentiviral transgenesis in comparison with non-transgenic counterparts. In vitro produced embryos were microinjected (TG group) at two-cell stage with a lentiviral construct containing enhanced green fluorescent protein (eGFP) gene, while embryos produced by in vitro fertilization (IVF group) or intrauterine insemination (IUI group) were not microinjected. Microinjection technique efficiently generated eight-cell transgenic embryos (97.4%; 114/117). Development rate on day 5 after fertilization was similar for TG (39.3%, 46/117) and IVF embryos (39.6%, 44/111). Pregnancy rate was detected in 50.0% (6/12) of recipient ewes with TG embryos, in 46.7% (7/15) with IVF embryos, and in 65.0% (13/20) of IUI ewes (P = NS). Nine lambs were born in TG group, six lambs in IVF group, and 16 lambs in IUI group. All TG lambs (9/9) were GFP positive to real-time PCR and eight (88.9%) showed a strong and evident GFP expression in mucosae, eyes and keratin tissues. Fetal growth monitored every 15 day by ultrasonography did not show significant differences. Transgenic lambs neither differ in morphometric variables in comparison with non transgenic IVF lambs within 3 months after birth. Transmission of the transgene to the progeny was observed in green fluorescent embryos produced by IVF using semen from the TG founder lambs. In conclusion, this study demonstrates the high efficiency of lentiviral technology to produce transgenic sheep, with no clinic differences in comparison with non transgenic lambs.
authors.affiliation: Unidad de Animales Transgénicos y de Experimentación (UATE), Institut Pasteur de Montevideo, Mataojo 2020, 11400, Montevideo, Uruguay.
authors.forename: M
authors.initials: M
authors.lastname: Crispo
authors.forename: M
authors.initials: M
authors.lastname: Vilariño
authors.forename: P C
authors.initials: PC
authors.lastname: dos Santos-Neto
authors.forename: R
authors.initials: R
authors.lastname: Núñez-Olivera
authors.forename: F
authors.initials: F
authors.lastname: Cuadro
authors.forename: N
authors.initials: N
authors.lastname: Barrera
authors.forename: A P
authors.initials: AP
authors.lastname: Mulet
authors.forename: T H
authors.initials: TH
authors.lastname: Nguyen
authors.forename: I
authors.initials: I
authors.lastname: Anegón
authors.forename: A
authors.initials: A
authors.lastname: Menchaca
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified / Q000235:genetics; D047108:Embryonic Development / Q000235:genetics*; D005260:Female; D005307:Fertilization in Vitro; D047109:Fetal Development / Q000235:genetics*; D005822:Genetic Vectors; D049452:Green Fluorescent Proteins / Q000235:genetics*; D016086:Lentivirus / Q000235:genetics*; D011247:Pregnancy; D012756:Sheep
chemical_list: C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins