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Dehdilani N, Goshayeshi L, Yousefi Taemeh S, Bahrami AR, Rival Gervier S, Pain B, Dehghani H. Integrating Omics and CRISPR Technology for Identification and Verification of Genomic Safe Harbor Loci in the Chicken Genome. Biol Proced Online 2023; 25:18. [PMID: 37355580 DOI: 10.1186/s12575-023-00210-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 06/02/2023] [Indexed: 06/26/2023] Open
Abstract
BACKGROUND One of the most prominent questions in the field of transgenesis is 'Where in the genome to integrate a transgene?'. Escape from epigenetic silencing and promoter shutdown of the transgene needs reliable genomic safe harbor (GSH) loci. Advances in genome engineering technologies combined with multi-omics bioinformatics data have enabled rational evaluation of GSH loci in the host genome. Currently, no validated GSH loci have been evaluated in the chicken genome. RESULTS Here, we analyzed and experimentally examined two GSH loci in the genome of chicken cells. To this end, putative GSH loci including chicken HIPP-like (cHIPP; between DRG1 and EIF4ENIF1 genes) and chicken ROSA-like (cROSA; upstream of the THUMPD3 gene) were predicted using multi-omics bioinformatics data. Then, the durable expression of the transgene was validated by experimental characterization of continuously-cultured isogenous cell clones harboring DsRed2-ΔCMV-EGFP cassette in the predicted loci. The weakened form of the CMV promoter (ΔCMV) allowed the precise evaluation of GSH loci in a locus-dependent manner compared to the full-length CMV promoter. CONCLUSIONS cHIPP and cROSA loci introduced in this study can be reliably exploited for consistent bio-manufacturing of recombinant proteins in the genetically-engineered chickens. Also, results showed that the genomic context dictates the expression of transgene controlled by ΔCMV in GSH loci.
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Affiliation(s)
- Nima Dehdilani
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran
| | - Lena Goshayeshi
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran
- Division of Biotechnology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Sara Yousefi Taemeh
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran
- Division of Biotechnology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Ahmad Reza Bahrami
- Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
- Industrial Biotechnology Research Group, Institute of Biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Sylvie Rival Gervier
- Stem Cell and Brain Research Institute, University of Lyon, Université Lyon 1, INSERM, INRAE, U1208, USC1361, 69500, Bron, France
| | - Bertrand Pain
- Stem Cell and Brain Research Institute, University of Lyon, Université Lyon 1, INSERM, INRAE, U1208, USC1361, 69500, Bron, France
| | - Hesam Dehghani
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Azadi Square, Mashhad, Iran.
- Division of Biotechnology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran.
- Department of Basic Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran.
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Johari YB, Scarrott JM, Pohle TH, Liu P, Mayer A, Brown AJ, James DC. Engineering of the CMV promoter for controlled expression of recombinant genes in HEK293 cells. Biotechnol J 2022; 17:e2200062. [PMID: 35482470 DOI: 10.1002/biot.202200062] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/07/2022] [Accepted: 04/23/2022] [Indexed: 11/08/2022]
Abstract
Expression of recombinant genes in HEK293 cells is frequently utilized for production of recombinant proteins and viral vectors. These systems frequently employ the cytomegalovirus (CMV) promoter to drive recombinant gene transcription. However, the mechanistic basis of CMV-mediated transcriptional activation in HEK293 cells is unknown and consequently there are no strategies to engineer CMV for controlled expression of recombinant genes. Extensive bioinformatic analyses of transcription factor regulatory elements (TFREs) within the human CMV sequence and transcription factor mRNAs within the HEK293 transcriptome revealed 80 possible regulatory interactions. Through in vitro functional testing using reporter constructs harboring discrete TFREs or CMV deletion variants we identified key TFRE components and clusters of TFREs (cis-regulatory modules) within the CMV sequence. Our data reveal that CMV activity in HEK293 cells is a function of the promoters various constituent TFREs including AhR:ARNT, CREB, E4F, Sp1, ZBED1, JunB, c-Rel, and NF-κB. We also identified critical Sp1-dependent upstream activator elements near the transcriptional start site that were required for efficient transcription and YY1 and RBP-Jκ binding sites that mediate transrepression. Our study shows for the first time that novel, compact CMV-derived promoters can be engineered that exhibit up to 50% higher transcriptional efficiency (activity per unit DNA sequence) or 14% increase in total activity compared to the wild-type counterpart.
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Affiliation(s)
- Yusuf B Johari
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, UK
| | - Joseph M Scarrott
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, UK
| | - Thilo H Pohle
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, UK
| | - Ping Liu
- Cell Line Development, REGENXBIO Inc., Rockville, Maryland, USA
| | - Ayda Mayer
- Cell Line Development, REGENXBIO Inc., Rockville, Maryland, USA
| | - Adam J Brown
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, UK.,Syngensys Ltd., Sheffield, UK
| | - David C James
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, UK.,Syngensys Ltd., Sheffield, UK
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3
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Desaulniers AT, Cederberg RA, Carreiro EP, Gurumurthy CB, White BR. A transgenic pig model expressing a CMV-ZsGreen1 reporter across an extensive array of tissues. J Biomed Res 2020; 35:163-173. [PMID: 33797416 PMCID: PMC8038527 DOI: 10.7555/jbr.34.20200111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Since genetic engineering of pigs can benefit both biomedicine and agriculture, selecting a suitable gene promoter is critically important. The cytomegalovirus (CMV) promoter, which can robustly drive ubiquitous transgene expression, is commonly used at present, yet recent reports suggest tissue-specific activity in the pig. The objective of this study was to quantify ZsGreen1 protein (in lieu of CMV promoter activity) in tissues from pigs harboring a CMV-ZsGreen1 transgene with a single integration site. Tissue samples (n=35) were collected from neonatal hemizygous (n=3) and homozygous (n=3) piglets and ZsGreen1 abundance was determined via immunoblotting. ZsGreen1 was detected in all tissues, except hypothalamus, kidney cortex and oviduct. The expression patterns of homozygous and hemizygous piglets were similar (P>0.05). However, quantification revealed that ZsGreen1 protein levels were tissue-specific. Within neural/endocrine tissues, ZsGreen1 abundance was highest in the anterior pituitary gland, intermediate in the cerebellum and lowest in the cerebrum, spinal cord and posterior pituitary (P<0.05). In the digestive system, ZsGreen1 was more abundant in the salivary gland than esophagus, stomach, pancreas, duodenum, jejunum, ileum, spleen, colon, gallbladder and liver (P<0.05). Interestingly, ZsGreen1 amounts also differed within an organ (i.e., the right ventricle had 3-fold higher levels than the other heart chambers; P<0.05). These results provide useful information for the use of the CMV promoter to drive transgene expression in the pig. Moreover, this swine model represents a novel resource of ZsGreen1-labeled organs and a valuable tool to advance genome editing research.
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Affiliation(s)
- Amy T Desaulniers
- Department of Animal Science, University of Nebraska-Lincoln, Lincoln, NE 68583-0908, USA
| | - Rebecca A Cederberg
- Department of Animal Science, University of Nebraska-Lincoln, Lincoln, NE 68583-0908, USA
| | - Elizabeth P Carreiro
- Department of Animal Science, University of Nebraska-Lincoln, Lincoln, NE 68583-0908, USA
| | - Channabasavaiah B Gurumurthy
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE 68198-5930, USA
| | - Brett R White
- Department of Animal Science, University of Nebraska-Lincoln, Lincoln, NE 68583-0908, USA
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4
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Huang X, Zou X, Xu Z, Tang F, Shi J, Zheng E, Liu D, Moisyadi S, Urschitz J, Wu Z, Li Z. Efficient deletion of LoxP-flanked selectable marker genes from the genome of transgenic pigs by an engineered Cre recombinase. Transgenic Res 2020; 29:307-319. [PMID: 32410183 DOI: 10.1007/s11248-020-00200-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 04/17/2020] [Indexed: 11/26/2022]
Abstract
Genetically modified (GM) pigs hold great promises for pig genetic improvement, human health and life science. When GM pigs are produced, selectable marker genes (SMGs) are usually introduced into their genomes for host cell or animal recognition. However, the SMGs that remain in GM pigs might have multiple side effects. To avoid the possible side effects caused by the SMGs, they should be removed from the genome of GM pigs before their commercialization. The Cre recombinase is commonly used to delete the LoxP sites-flanked SMGs from the genome of GM animals. Although SMG-free GM pigs have been generated by Cre-mediated recombination, more efficient and cost-effective approaches are essential for the commercialization of SMG-free GM pigs. In this article we describe the production of a recombinant Cre protein containing a cell-penetrating and a nuclear localization signal peptide in one construct. This engineered Cre enzyme can efficiently excise the LoxP-flanked SMGs in cultured fibroblasts isolated from a transgenic pig, which then can be used as nuclear donor cells to generate live SMG-free GM pigs harboring a desired transgene by somatic cell nuclear transfer. This study describes an efficient and far-less costly method for production of SMG-free GM pigs.
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Affiliation(s)
- Xiaoling Huang
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
- Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
- Guangdong Guangken Animal Husbandry Engineering Research Institute Co., Ltd., Guangzhou, 510610, Guangdong, China
| | - Xian Zou
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
- Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Zhiqian Xu
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
- Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Fei Tang
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
- Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Junsong Shi
- Guangdong Wens Pig Breeding Technology Co., Ltd., Wens Foodstuff Group Co., Ltd., Yunfu, 527400, Guangdong, China
| | - Enqin Zheng
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
- Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Dewu Liu
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
- Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Stefan Moisyadi
- Institute for Biogenesis Research, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI, 96822, USA
- Manoa BioSciences, 1717 Mott-Smith Dr. #3213, Honolulu, HI, 96822, USA
| | - Johann Urschitz
- Institute for Biogenesis Research, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI, 96822, USA
| | - Zhenfang Wu
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
- Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
| | - Zicong Li
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
- Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
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5
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Brown AJ, Sweeney B, Mainwaring DO, James DC. NF-κB, CRE and YY1 elements are key functional regulators of CMV promoter-driven transient gene expression in CHO cells. Biotechnol J 2015; 10:1019-28. [PMID: 25612069 DOI: 10.1002/biot.201400744] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 12/11/2014] [Accepted: 01/21/2015] [Indexed: 02/02/2023]
Abstract
Transient gene expression (TGE) in CHO cells is utilized to produce material for use in early stage drug development. These systems typically utilize the cytomegalovirus (CMV) promoter to drive recombinant gene transcription. In this study, we have mechanistically dissected CMV-mediated TGE in CHO cells in order to identify the key regulators of this process. An in silico analysis of the promoter composition of transcription factor regulatory elements (TFREs) and the CHO cell repertoire of transcription factors identified eight TFREs as likely effectors of CMV activity. We determined the regulatory function of these elements by preventing their cognate transcription factors from binding at the CMV promoter. This was achieved by both scrambling promoter binding site sequences and using decoy molecules to sequester intracellular transcription factors. We determined that the vast majority of CMV activity is mediated by just two discrete TFREs, showing that simultaneous inhibition of NF-κB and CRE-mediated transactivation reduced CMV-driven transient secreted alkaline phosphatase (SEAP) production by over 75%. Further, we identified a mechanism by which CMV-mediated TGE is negatively regulated in CHO cells, showing that inhibition of YY1-mediated transrepression increased SEAP production 1.5-fold. This work enables optimization and control of CMV-mediated TGE in CHO cells, in order to improve transient protein production yields.
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Affiliation(s)
- Adam J Brown
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, England
| | - Bernie Sweeney
- Protein Expression and Purification Group, UCB, Slough, England
| | | | - David C James
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, England.
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6
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Lee SH, Gupta MK, Ho YT, Kim T, Lee HT. Transgenic chickens expressing human urokinase-type plasminogen activator. Poult Sci 2013; 92:2396-403. [DOI: 10.3382/ps.2013-03223] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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7
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Hirao A, Kawarasaki T, Konno K, Enya S, Shibata M, Kangawa A, Kobayashi E. Green fluorescent protein (GFP) expression patterns in the olfactory epithelium of GFP transgenic cloned Jinhua pigs. ACTA ZOOL-STOCKHOLM 2013. [DOI: 10.1111/azo.12029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Atsushi Hirao
- Department of Anatomy; Division of Anatomy & Embryology; Jichi Medical University; Tochigi 329-0498 Japan
| | - Tatsuo Kawarasaki
- Department of Animal Science; School of Agriculture; Tokai University; Minamiaso Kumamoto 869-1404 Japan
| | - Kenjiro Konno
- Laboratory of Animal Science and Medicine; Department of Animal Medical Sciences; Faculty of Science; Kyoto Sangyo University; Kyoto 603-8555 Japan
| | - Satoko Enya
- Shizuoka Swine & Poultry Research Center; Shizuoka Prefectural Research Institute of Animal Industry; Shizuoka 439-0037 Japan
| | - Masatoshi Shibata
- Shizuoka Swine & Poultry Research Center; Shizuoka Prefectural Research Institute of Animal Industry; Shizuoka 439-0037 Japan
| | - Akihisa Kangawa
- Shizuoka Swine & Poultry Research Center; Shizuoka Prefectural Research Institute of Animal Industry; Shizuoka 439-0037 Japan
| | - Eiji Kobayashi
- Division of Development of Advanced Treatment; Center for Development of Advanced Medical Technology; Jichi Medical University; Tochigi 329-0498 Japan
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8
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Mella-Alvarado V, Gautier A, Le Gac F, Lareyre JJ. Tissue and cell-specific transcriptional activity of the human cytomegalovirus immediate early gene promoter (UL123) in zebrafish. Gene Expr Patterns 2013; 13:91-103. [PMID: 23347918 DOI: 10.1016/j.gep.2013.01.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Revised: 12/27/2012] [Accepted: 01/03/2013] [Indexed: 10/27/2022]
Abstract
The human cytomegalovirus (CMV) is a member of the herpesvirus superfamily and causes different diseases including encephalitis, gastrointestinal diseases, pneumonitis, hepatitis, and retinitis. The immediate early (IE) gene of the human cytomegalovirus is essential to the viral replication. The proximal promoter region of this gene behaves as a strong enhancer and was commonly used to overexpress genes in vitro and in vivo in numerous cell types and species. However, there was no detailed report on the spatial and temporal transcriptional activity of the human CMV-IE gene promoter in zebrafish. In the present study, we generated stable transgenic zebrafish lines carrying the eGFP reporter gene under the control of the human CMV-IE gene promoter (-602/-14). We demonstrated that the hCMV-IE:eGFP transgene was expressed in numerous tissues but transgene expression was either regionalized or restricted to specific cell types as embryo and larval development progressed. In adult, the global expression pattern was similar but not identical to that described for the simian CMV-IE gene promoter in stable zebrafish with high transgene expression in the spinal cord, olfactory organs, central nervous system, neuromasts, retina, and skeletal muscles. However, we describe additional major expression sites in the hepatocytes, the epithelial cells of the intestine, the epithelial cells of the renal tubules, and the oocytes. Interestingly, our study shows that the tissue and cell specific expression pattern of the human CMV-IE gene promoter is rather well conserved in stable transgenic zebrafish compared to that observed in mouse. The major expression sites described in zebrafish are in agreement with the targeted cells and symptoms resulting from CMV infections in human. Finally, the hCMV:eGFP transgenic lines described in the present study will be valuable tools to trace specific cell lineages in adult zebrafish.
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Affiliation(s)
- Vanessa Mella-Alvarado
- INRA, UR1037 LPGP (Laboratoire de Physiologie et Génomique des Poissons), SFR BIOSIT, BioGenOuest, Campus de Beaulieu, 35042 Rennes cedex, France
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9
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Welfare assessment in transgenic pigs expressing green fluorescent protein (GFP). Transgenic Res 2011; 21:773-84. [PMID: 22173943 DOI: 10.1007/s11248-011-9571-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Accepted: 10/12/2011] [Indexed: 10/14/2022]
Abstract
Since large animal transgenesis has been successfully attempted for the first time about 25 years ago, the technology has been applied in various lines of transgenic pigs. Nevertheless one of the concerns with the technology--animal welfare--has not been approached through systematic assessment and statements regarding the welfare of transgenic pigs have been based on anecdotal observations during early stages of transgenic programs. The main aim of the present study was therefore to perform an extensive welfare assessment comparing heterozygous transgenic animals expressing GFP with wildtype animals along various stages of post natal development. The protocol used covered reproductory performance and behaviour in GFP and wildtype sows and general health and development, social behaviour, exploratory behaviour and emotionality in GFP and wildtype littermates from birth until an age of roughly 4 months. The absence of significant differences between GFP and wildtype animals in the parameters observed suggests that the transgenic animals in question are unlikely to suffer from deleterious effects of transgene expression on their welfare and thus support existing anecdotal observations of pigs expressing GFP as healthy. Although the results are not surprising in the light of previous experience, they give a more solid fundament to the evaluation of GFP expression as being relatively non-invasive in pigs. The present study may furthermore serve as starting point for researchers aiming at a systematic characterization of welfare relevant effects in the line of transgenic pigs they are working with.
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Dual promoter lentiviral vector generates transgenic mice expressing E2-CSFV glycoprotein in their milk, but impairs early identification of transgenic embryos. Theriogenology 2011; 75:1280-9. [PMID: 21316751 DOI: 10.1016/j.theriogenology.2010.11.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Revised: 11/24/2010] [Accepted: 11/25/2010] [Indexed: 12/13/2022]
Abstract
Lentiviral vectors containing the green fluorescent protein gene have been successfully used to select transgenic embryos before transfer to a surrogate mother. However, there are apparently no reports regarding early detection of transgenic embryos using a lentiviral vector carrying an additional transcription unit for tissue-specific expression of a valuable protein. In this study, two HIV-based lentiviral vectors were constructed. The first one contained the green fluorescent protein (GFP) coding sequence driven by the early SV40 promoter (Lv-G), whereas the other contained an additional transcription unit for the expression of E2 glycoprotein from classical swine fever virus, driven by a 1.5 kb αS1casein promoter from water buffalo (Lv-αS1cE2hisG). Microinjection of single-cell mouse embryos with Lv-G lentiviral vector rendered embryos which were GFP-positive, beginning at the four-cell stage. Of 33 mice born, 28 (81%) carried the transgene DNA and 15 (55.5%) were GFP-positive. Microinjection of Lv-αS1cE2hisG lentiviral vector yielded 28 mice born; although 24 (85%) carried the transgene DNA, none were GFP-positive, suggesting that the tissue-specific expression cassette interfered with expression of the ubiquitous trancriptional unit. In Lv-αS1cE2hisG transgenic mice, E2his was expressed in milk as a homodimer (at concentrations ≤ 0.422 mg/mL). This was apparently the first report of expression of a recombinant protein in the milk of transgenic animals generated by lentiviral transgenesis.
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Lentiviral transgenesis in livestock. Transgenic Res 2010; 20:441-2. [PMID: 20927646 DOI: 10.1007/s11248-010-9448-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Accepted: 09/25/2010] [Indexed: 10/19/2022]
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12
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Kvell K, Czömpöly T, Hiripi L, Balogh P, Kóbor J, Bodrogi L, Pongrácz JE, Ritchie WA, Bősze Z. Characterisation of eGFP-transgenic BALB/c mouse strain established by lentiviral transgenesis. Transgenic Res 2009; 19:105-12. [DOI: 10.1007/s11248-009-9288-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2009] [Accepted: 05/19/2009] [Indexed: 11/25/2022]
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