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Pall E.,University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca | Groza I.,University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca | Cenariu M.,University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca | Soritau O.,Prof Dr Ioan Chiricuta Oncological Institute | And 2 more authors.
Romanian Journal of Morphology and Embryology

Embryonic stem cells have the ability to remain undifferentiated and proliferate in vitro while maintaining the potential to differentiate into derivatives of all three embryonic germ layers. The aim of the present study was to establish mouse ES lines from blastocyst stage embryos obtained after CD1/EGFP mice superovulation. We isolated, cultured and determined the characteristics of mouse embryonic stem cells in early passages, which were first described by Evans M and Kaufman M. Therefore, we evaluated the morphological criteria for the approval of ES cells in early expansion stage. Two cell lines were isolated (CDE1 and CDE2) and analyzed. They showed similar characteristics to those reported earlier for blastocyst-derived ES cell lines. Source

Kvell K.,University of Pecs | Czompoly T.,University of Pecs | Hiripi L.,Genetic Modification Program Group | Balogh P.,University of Pecs | And 5 more authors.
Transgenic Research

Lentiviral technology is a powerful tool for the creation of stable transgenic animals. However, uncertainties have remained whether constitutive promoters resist long-term silencing. We used concentrated HIV-1 based lentiviral vectors to create stable transgenic BALB/c mice by perivitelline injection. In our vectors eGFP expression was driven by the human EF1α promoter. The established transgenic animals were analyzed for eGFP expression by in vivo fluorescence imaging, PCR, histology and flow-cytometry. eGFP expression showed even distribution without mosaicism; however, tissue-dependent differences of eGFP expression were observed. Up to the sixth generation only one newborn showed eGFP inactivation. eGFP + transgenic bone marrow cells efficiently provided long-term haemopoietic repopulation in radiation chimeras, regenerating all bone marrow-derived lineages with eGFP + cells with distinct eGFP expression profiles. The established eGFP + BALB/c mouse strain is expected to be extremely useful in various immunological experiments. © Springer Science+Business Media B.V. 2009. Source

Hiripi L.,Genetic Modification Program Group | Negre D.,Ecole Normale Superieure de Lyon | Cosset F.-L.,Ecole Normale Superieure de Lyon | Kvell K.,University of Pecs | And 6 more authors.
Transgenic Research

Transgenic rabbit is the preferred disease model of atherosclerosis, lipoprotein metabolism and cardiovascular diseases since upon introducing genetic mutations of human genes, rabbit models reflect human physiological and pathological states more accurately than mouse models. Beyond that, transgenic rabbits are also used as bioreactors to produce pharmaceutical proteins in their milk. Since in the laboratory rabbit the conventional transgenesis has worked with the same low efficiency in the last twenty five years and truly pluripotent embryonic stem cells are not available to perform targeted mutagenesis, our aim was to adapt lentiviral transgenesis to this species. A simian immunodeficiency virus based replication defective lentiviral vector was used to create transgenic rabbit through perivitelline space injection of fertilized oocytes. The enhanced green fluorescent protein (GFP) gene was placed under the ubiquitous CAG promoter. Transgenic founder rabbits showed mosaic pattern of GFP expression. Transgene integration and expression was revealed in tissues derived from all three primary germ layers. Transgene expression was detected in the developing sperm cells and could get through the germ line without epigenetic silencing, albeit with very low frequency. Our data show for the first time, that lentiviral transgenesis could be a feasible and viable alternative method to create genetically modified laboratory rabbit. © 2010 Springer Science+Business Media B.V. Source

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