Early fetal development of nuclear transfer bovine embryos generated from fibroblasts genetically modified by piggybac transposition

Authors
Alessio, Ana Paula; Fili, Alejandro; Forcato, Diego Oscar; Olmos Nicotra, Maria Florencia; Alustiza, Fabrisio Eduardo; Rodriguez, Natalia Evelin; Sampaio, R. V.; Sangalli, J.; Bressan, F.; Fantinato-Neto, P.; Meirelles, F.; Owens, J.; Moisyadi, S.; Kues, W.A.; Bosch, Pablo
Publication Year
2014
Language
English
Format
article
Status
Published version
Description
Transposon-mediated transgenesis is a well-established tool for genome manipulation in small animal models. However, translation of this active transgenesis method to the large animal setting requires further investigation. We have previously demonstrated that a helper-independent piggyBac (PB) transposon system can efficiently transpose transgenes into the bovine genome [Alessio et al. 2014 Reprod. Domest. Anim. 49 (Suppl. 1), 8]. The aims of the current study were a) to investigate the effectiveness of a hyperactive version of the PB transposase, and b) to determine the ability of the genetically modified cells to support early embryo and fetal development upon somatic cell nuclear transfer (SCNT). Bovine fetal fibroblasts (BFF) were chemically transfected with either pmGENIE-3 (a helper-independent PB transposon conferring genes for hygromycin resistance and enhanced green fluorescent protein (EGFP); Urschitz et al. 2010 PNAS USA 107, 8117-8122), pmhyGENIE-3 (carrying an hyperactive version of the PB transposase; Marh et al. 2012 PNAS USA 109, 19184-19189), or pmGENIE-3/Δ PB (a control plasmid lacking a functional PB transposase). Upon transfection, cell cultures were subjected to 14 days of hygromycin selection. Antibiotic-resistant and EGFP+ colonies were counted and data analysed by ANOVA and Tukey´s test. For SCNT, pmhyGENIE-3 and pmGENIE-3 polyclonal cell lines were selected by FACS and individual cells used as nuclear donors. Day 7 blastocysts were nonsurgically transferred to synchronized recipients. Conceptuses were recovered by Day 35 of gestation, observed under fluorescence excitation, and genotyped. The mean number of colonies in pmhyGENIE-3 group was significantly higher than those in pmGENIE-3 and the control group (324.0±17.8 v. 100.0±16.1 and 2.8±0.8 respectively, n=4-7; P<0.05). The hyperactive transposase increased transgene integration efficiency 3.24 times compared with the conventional PB transposase. The SCNT and early fetal development data are summarised in Table 1. Phenotypic analysis revealed that both transgenic fetuses and the extraembryonic membranes expressed EGFP with no macroscopic evidence of variegated transgene expression. Molecular analysis by PCR confirmed that both fetuses carried the transposon DNA. Here, we demonstrate that a hyperactive version of the PB transposase is more active in bovine cells than the conventional PB transposase. In addition, SCNT embryos generated from genetically modified cells by the pGENIE transposon system can progress to early stages of fetal development.
Fil: Alessio, Ana Paula. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Biología Molecular; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Fili, Alejandro. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Biología Molecular; Argentina
Fil: Forcato, Diego Oscar. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Biología Molecular; Argentina
Fil: Olmos Nicotra, Maria Florencia. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Biología Molecular; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Alustiza, Fabrisio Eduardo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Biología Molecular; Argentina
Fil: Rodriguez, Natalia Evelin. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Biología Molecular; Argentina
Fil: Sampaio, R. V.. Universidade de Sao Paulo; Brasil
Fil: Sangalli, J.. Universidade de Sao Paulo; Brasil
Fil: Bressan, F.. Universidade de Sao Paulo; Brasil
Fil: Fantinato-Neto, P.. Universidade de Sao Paulo; Brasil
Fil: Meirelles, F.. Universidade de Sao Paulo; Brasil
Fil: Owens, J.. John A. Burns School Of Medicine; Estados Unidos
Fil: Moisyadi, S.. John A. Burns School Of Medicine; Estados Unidos
Fil: Kues, W.A.. Friedrich-Loeffler-Institut; Alemania
Fil: Bosch, Pablo. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Biología Molecular; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Subject
ACTIVE TRANSGENESIS
TRANSPOSON
BOVINE
NUCLEAR TRANSFER
PIGGYBAC
Otras Biotecnología Agropecuaria
Biotecnología Agropecuaria
CIENCIAS AGRÍCOLAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/45178