Gödöllő, Hungary
Gödöllő, Hungary

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Bender B.,Institute of Animal Biotechnology | Bender B.,ImmunoGenes Kft | Ivett Hoffmann O.,Institute of Animal Biotechnology | Negre D.,Ecole Normale Superieure de Lyon | And 3 more authors.
BioTechniques | Year: 2013

Efficient production of transgenic animals using low-titer lentiviral constructs remains challenging. Here we demonstrate that microinjec-tion of simian immundeficiency virus-derived lentiviral constructs can produce transgenic mice and rats with high efficiency even when using low-titer virus preparations.

Osteil P.,French Institute of Health and Medical Research | Osteil P.,Stem Cell and Brain Institute | Osteil P.,University Claude Bernard Lyon 1 | Osteil P.,French National Institute for Agricultural Research | And 38 more authors.
Biology Open | Year: 2013

Not much is known about the molecular and functional features of pluripotent stem cells (PSCs) in rabbits. To address this, we derived and characterized 2 types of rabbit PSCs from the same breed of New Zealand White rabbits: 4 lines of embryonic stem cells (rbESCs), and 3 lines of induced PSCs (rbiPSCs) that were obtained by reprogramming adult skin fibroblasts. All cell lines required fibroblast growth factor 2 for their growth and proliferation. All rbESC lines showed molecular and functional properties typically associated with primed pluripotency. The cell cycle of rbESCs had a prolonged G1 phase and a DNA damage checkpoint before entry into the S phase, which are the 2 features typically associated with the somatic cell cycle. In contrast, the rbiPSC lines exhibited some characteristics of naïve pluripotency, including resistance to single-cell dissociation by trypsin, robust activity of the distal enhancer of the mouse Oct4 gene, and expression of naïve pluripotency-specific genes, as defined in rodents. According to gene expression profiles, rbiPSCs were closer to the rabbit inner cell mass (ICM) than rbESCs. Furthermore, rbiPSCs were capable of colonizing the ICM after aggregation with morulas. Therefore, we propose that rbiPSCs self-renew in an intermediate state between naïve and primed pluripotency, which represents a key step toward the generation of bona fide naïve PSC lines in rabbits. © 2013. Published by The Company of Biologists Ltd.

Katter K.,University of Veterinary Medicine Vienna | Geurts A.M.,Medical College of Wisconsin | Hoffmann O.,Institute of Animal Biotechnology | Mates L.,Medical College of Wisconsin | And 24 more authors.
FASEB Journal | Year: 2013

Germline transgenesis is an important procedure for functional investigation of biological pathways, as well as for animal biotechnology. We have established a simple, nonviral protocol in three important biomedical model organisms frequently used in physiological studies. The protocol is based on the hyperactive Sleeping Beauty transposon system, SB100X, which reproducibly promoted generation of transgenic founders at frequencies of 50-64, 14-72, and 15% in mice, rats, and rabbits, respectively. The SB100X-mediated transgene integrations are less prone to genetic mosaicism and gene silencing as compared to either the classical pronuclear injection or to lentivirus-mediated transgenesis. The method was successfully applied to a variety of transgenes and animal models, and can be used to generate founders with single-copy integrations. The transposon vector also allows the generation of transgenic lines with tissue-specific expression patterns specified by promoter elements of choice, exemplified by a rat reporter strain useful for tracking serotonergic neurons. As a proof of principle, we rescued an inborn genetic defect in the fawn-hooded hypertensive rat by SB100X transgenesis. A side-by-side comparison of the SB100X- and piggyBac-based protocols revealed that the two systems are complementary, offering new opportunities in genome manipulation. © FASEB.

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