1
|
Dehdilani N, Taemeh SY, Goshayeshi L, Dehghani H. Genetically engineered birds; pre-CRISPR and CRISPR era. Biol Reprod 2021; 106:24-46. [PMID: 34668968 DOI: 10.1093/biolre/ioab196] [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: 08/12/2021] [Revised: 10/08/2021] [Accepted: 10/14/2021] [Indexed: 11/14/2022] Open
Abstract
Generating biopharmaceuticals in genetically engineered bioreactors continues to reign supreme. Hence, genetically engineered birds have attracted considerable attention from the biopharmaceutical industry. Fairly recent genome engineering methods have made genome manipulation an easy and affordable task. In this review, we first provide a broad overview of the approaches and main impediments ahead of generating efficient and reliable genetically engineered birds, and various factors that affect the fate of a transgene. This section provides an essential background for the rest of the review, in which we discuss and compare different genome manipulation methods in the pre-CRISPR and CRISPR era in the field of avian genome engineering.
Collapse
Affiliation(s)
- Nima Dehdilani
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, 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, Mashhad, Iran
| | - Lena Goshayeshi
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Hesam Dehghani
- Stem Cell Biology and Regenerative Medicine Research Group, Research Institute of Biotechnology, Ferdowsi University of Mashhad, 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
| |
Collapse
|
2
|
Karachaliou CE, Vassilakopoulou V, Livaniou E. IgY technology: Methods for developing and evaluating avian immunoglobulins for the in vitro detection of biomolecules. World J Methodol 2021; 11:243-262. [PMID: 34631482 PMCID: PMC8472547 DOI: 10.5662/wjm.v11.i5.243] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 06/10/2021] [Accepted: 07/13/2021] [Indexed: 02/06/2023] Open
Abstract
The term “IgY technology” was introduced in the literature in the mid 1990s to describe a procedure involving immunization of avian species, mainly laying hens and consequent isolation of the polyclonal IgYs from the “immune” egg yolk (thus avoiding bleeding and animal stress). IgYs have been applied to various fields of medicine and biotechnology. The present article will deal with specific aspects of IgY technology, focusing on the currently reported methods for developing, isolating, evaluating and storing polyclonal IgYs. Other topics such as current information on isolation protocols or evaluation of IgYs from different avian species are also discussed. Specific advantages of IgY technology (e.g., novel antibody specificities that may emerge via the avian immune system) will also be discussed. Recent in vitro applications of polyclonal egg yolk-derived IgYs to the field of disease diagnosis in human and veterinary medicine through in vitro immunodetection of target biomolecules will be presented. Moreover, ethical aspects associated with animal well-being as well as new promising approaches that are relevant to the original IgY technology (e.g., development of monoclonal IgYs and IgY-like antibodies through the phage display technique or in transgenic chickens) and future prospects in the area will also be mentioned.
Collapse
Affiliation(s)
- Chrysoula-Evangelia Karachaliou
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Centre for Scientific Research “Demokritos”, Athens 15310, Greece
| | - Vyronia Vassilakopoulou
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Centre for Scientific Research “Demokritos”, Athens 15310, Greece
| | - Evangelia Livaniou
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Centre for Scientific Research “Demokritos”, Athens 15310, Greece
| |
Collapse
|
3
|
Improving germline transmission efficiency in chimeric chickens using a multi-stage injection approach. PLoS One 2021; 16:e0247471. [PMID: 34086696 PMCID: PMC8177527 DOI: 10.1371/journal.pone.0247471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Accepted: 05/18/2021] [Indexed: 11/19/2022] Open
Abstract
Although different strategies have been developed to generate transgenic poultry, low efficiency of germline transgene transmission has remained a challenge in poultry transgenesis. Herein, we developed an efficient germline transgenesis method using a lentiviral vector system in chickens through multiple injections of transgenes into embryos at different stages of development. The embryo chorioallantoic membrane (CAM) vasculature was successfully used as a novel route of gene transfer into germline tissues. Compared to the other routes of viral vector administration, the embryo’s bloodstream at Hamburger-Hamilton (HH) stages 14–15 achieved the highest rate of germline transmission (GT), 7.7%. Single injection of viral vectors into the CAM vasculature resulted in a GT efficiency of 2.7%, which was significantly higher than the 0.4% obtained by injection into embryos at the blastoderm stage. Double injection of viral vectors into the bloodstream at HH stages 14–15 and through CAM was the most efficient method for producing germline chimeras, giving a GT rate of 13.6%. The authors suggest that the new method described in this study could be efficiently used to produce transgenic poultry in virus-mediated gene transfer systems.
Collapse
|
4
|
Affiliation(s)
- M. Naito
- National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan,
| |
Collapse
|
5
|
Wang AP, Wang YJ, Wu S, Zuo WY, Guo CM, Hong WM, Zhu SY. Study on the expression of human lysozyme in oviduct bioreactor mediated by recombinant avian adeno-associated virus. Poult Sci 2017; 96:2447-2453. [PMID: 28339926 DOI: 10.3382/ps/pex029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 01/08/2017] [Indexed: 11/20/2022] Open
Abstract
Due to its antimicrobial properties and low toxicity, human lysozyme (hLYZ) has broad application in the medical field and as a preservative used by the food industry. However, limited availability hinders its widespread use. Hence, we constructed a recombinant avian adeno-associated virus (rAAAV) that would specifically express hLYZ in the chicken oviduct and harvested hLYZ from the egg whites of laying hens. The oviduct-specific human lysozyme expression cassette flanked by avian adeno-associated virus (AAAV) inverted terminal repeats (ITRs) was subcloned into the modified baculovirus transfer vector pFBX, and then the recombinant baculovirus rBac-ITRLYZ was generated. The recombinant avian adeno-associated virus was produced by co-infecting Sf9 cells with rBac-ITRLYZ and the other 2 baculoviruses containing AAAV functional genes and structural genes, respectively. Electron microscopy and real-time PCR revealed that the recombinant viral particles were generated successfully with a typical AAAV morphology and a high titer. After one intravenous injection of each laying hen with 2 × 1011 viral particles, oviduct-specific expression of recombinant human lysozyme (rhLYZ) was detected by reverse transcription-PCR. The expression level of rhLYZ in the first wk increased to 258 ± 11.5 μg/mL, reached a maximum of 683 ± 16.4 μg/mL at the fifth wk, and then progressively declined during the succeeding 7 wk of the study. Western blotting indicated that the oviduct-expressed rhLYZ had the same molecular weight as the natural enzyme. These results indicate that an efficient and convenient oviduct bioreactor mediated by rAAAV has been established, and it is useful for production of other recombinant proteins.
Collapse
Affiliation(s)
- A P Wang
- Jiangsu Agri-animal Husbandry Vocational College, Veterinary Bio-pharmaceutical, Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Taizhou, 225300, China
| | - Y J Wang
- Jiangsu Agri-animal Husbandry Vocational College, Veterinary Bio-pharmaceutical, Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Taizhou, 225300, China
| | - S Wu
- Jiangsu Agri-animal Husbandry Vocational College, Veterinary Bio-pharmaceutical, Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Taizhou, 225300, China
| | - W Y Zuo
- Jiangsu Agri-animal Husbandry Vocational College, Veterinary Bio-pharmaceutical, Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Taizhou, 225300, China
| | - C M Guo
- Jiangsu Agri-animal Husbandry Vocational College, Veterinary Bio-pharmaceutical, Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Taizhou, 225300, China
| | - W M Hong
- Jiangsu Agri-animal Husbandry Vocational College, Veterinary Bio-pharmaceutical, Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Taizhou, 225300, China
| | - S Y Zhu
- Jiangsu Agri-animal Husbandry Vocational College, Veterinary Bio-pharmaceutical, Jiangsu Key Laboratory for High-Tech Research and Development of Veterinary Biopharmaceuticals, Taizhou, 225300, China
| |
Collapse
|
6
|
Expression of recombinant human lysozyme in transgenic chicken promotes the growth of Bifidobacterium in the intestine and improves postnatal growth of chicken. AMB Express 2016; 6:110. [PMID: 27830497 PMCID: PMC5102985 DOI: 10.1186/s13568-016-0280-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Accepted: 10/31/2016] [Indexed: 12/20/2022] Open
Abstract
Lysozyme is one kind of antimicrobial proteins and often used as feed additive which can defend against pathogenic bacteria and enhance immune function of animals. In this study, we have injected the lentiviral vector expressing recombinant human lysozyme (rhLZ) gene into the blastoderm of chicken embryo to investigate the effect of recombinant human lysozyme on postnatal intestinal microbiota distribution and growth performance of chicken. Successfully, we generated 194 transgenic chickens identified by Southern blot with a positive transgenic rate of 24%. The average concentration of rhLZ was 29.90 ± 6.50 μg/mL in the egg white. Lysozyme in egg white of transgenic chickens had a significantly higher antibacterial activity than those of non-transgenic chickens by lysoplate assay (P < 0.05). The feces of transgenic and non-transgenic chickens were collected and five types of bacteria (Lactobacillus, Salmonella, Bifidobacterium, Staphylococcus aureus and Escherichia coli) were isolated and cultured to detect the impact of rhLZ on gut microbiota. Among the five bacteria, the number of Bifidobacterium in the intestine of those transgenic was significantly increased (P < 0.05). Moreover, the growth traits of the transgenic and non-transgenic chickens were analyzed. It was found that the 6-week shank length, 6-week weight and 18-week weight of transgenic chickens were significantly increased than that of non-transgenic chickens. The results demonstrated that rhLZ-transgenic chicken could promote the growth of Bifidobacterium in the intestine and improve the postnatal growth of chicken.
Collapse
|
7
|
Cao D, Wu H, Li Q, Sun Y, Liu T, Fei J, Zhao Y, Wu S, Hu X, Li N. Expression of recombinant human lysozyme in egg whites of transgenic hens. PLoS One 2015; 10:e0118626. [PMID: 25706123 PMCID: PMC4338068 DOI: 10.1371/journal.pone.0118626] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 01/21/2015] [Indexed: 11/19/2022] Open
Abstract
Chicken egg lysozyme (cLY) is an enzyme with 129 amino acid (AA) residue enzyme. This enzyme is present not only in chicken egg white but also in mucosal secretions such as saliva and tears. The antibacterial properties of egg white can be attributed to the presence of lysozyme, which is used as an anti-cancer drug and for the treatment of human immunodeficiency virus (HIV) infection. In this study, we constructed a lentiviral vector containing a synthetic cLY signal peptide and a 447 bp synthetic human lysozyme (hLY) cDNA sequence driven by an oviduct-specific ovalbumin promoter, and microinjected into the subgerminal cavity of stage X chick embryos to generate transgenic chicken. The transgene inserted in the chicken chromosomes directs the synthesis and secretion of hLY which has three times higher specific activity than cLY. Three G1 transgenic chickens were identified, the only female of which expressed recombinant human lysozyme (rhLY) at 57.66 ± 4.10 μg/ml in the egg white and the G2 transgenic hens of the G1 transgenic cock A011 expressed rhLY at 48.72 ± 1.54 μg/ml. This experiment demonstrated that transgenic hens with stable oviduct-specific expression of recombinant human lysozyme proteins can be created by microinjection of lentiviral vectors. The results of this research could be contribute to the technological development using transgenic hens as a cost-effective alternative to other mammalian systems, such as cow, sheep and goats, for the production of therapeutic proteins and other applications.
Collapse
Affiliation(s)
- Dainan Cao
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, P. R. China
| | - Hanyu Wu
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, P. R. China
| | - Qingyuan Li
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, P. R. China
| | - Yingmin Sun
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, P. R. China
| | - Tongxin Liu
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, P. R. China
| | - Jing Fei
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, P. R. China
| | - Yaofeng Zhao
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, P. R. China
| | - Sen Wu
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, P. R. China
| | - Xiaoxiang Hu
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, P. R. China
- * E-mail:
| | - Ning Li
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, P. R. China
| |
Collapse
|
8
|
Immunoglobulin knockout chickens via efficient homologous recombination in primordial germ cells. Proc Natl Acad Sci U S A 2013; 110:20170-5. [PMID: 24282302 DOI: 10.1073/pnas.1317106110] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Gene targeting by homologous recombination or by sequence-specific nucleases allows the precise modification of genomes and genes to elucidate their functions. Although gene targeting has been used extensively to modify the genomes of mammals, fish, and amphibians, a targeting technology has not been available for the avian genome. Many of the principles of humoral immunity were discovered in chickens, yet the lack of gene targeting technologies in birds has limited biomedical research using this species. Here we describe targeting the joining (J) gene segment of the chicken Ig heavy chain gene by homologous recombination in primordial germ cells to establish fully transgenic chickens carrying the knockout. In homozygous knockouts, Ig heavy chain production is eliminated, and no antibody response is elicited on immunization. Migration of B-lineage precursors into the bursa of Fabricius is unaffected, whereas development into mature B cells and migration from the bursa are blocked in the mutants. Other cell types in the immune system appear normal. Chickens lacking the peripheral B-cell population will provide a unique experimental model to study avian immune responses to infectious disease. More generally, gene targeting in avian primordial germ cells will foster advances in diverse fields of biomedical research such as virology, stem cells, and developmental biology, and provide unique approaches in biotechnology, particularly in the field of antibody discovery.
Collapse
|
9
|
Nishijima KI, Iijima S. Transgenic chickens. Dev Growth Differ 2012; 55:207-16. [DOI: 10.1111/dgd.12032] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 11/05/2012] [Accepted: 11/20/2012] [Indexed: 12/01/2022]
Affiliation(s)
- Ken-ichi Nishijima
- Department of Biotechnology; Graduate School of Engineering; Nagoya University; Furo-cho, Chikusa-ku; Nagoya; 464-8603; Japan
| | - Shinji Iijima
- Department of Biotechnology; Graduate School of Engineering; Nagoya University; Furo-cho, Chikusa-ku; Nagoya; 464-8603; Japan
| |
Collapse
|
10
|
Insight into alternative approaches for control of avian influenza in poultry, with emphasis on highly pathogenic H5N1. Viruses 2012. [PMID: 23202521 PMCID: PMC3509689 DOI: 10.3390/v4113179] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Highly pathogenic avian influenza virus (HPAIV) of subtype H5N1 causes a devastating disease in poultry but when it accidentally infects humans it can cause death. Therefore, decrease the incidence of H5N1 in humans needs to focus on prevention and control of poultry infections. Conventional control strategies in poultry based on surveillance, stamping out, movement restriction and enforcement of biosecurity measures did not prevent the virus spreading, particularly in developing countries. Several challenges limit efficiency of the vaccines to prevent outbreaks of HPAIV H5N1 in endemic countries. Alternative and complementary approaches to reduce the current burden of H5N1 epidemics in poultry should be encouraged. The use of antiviral chemotherapy and natural compounds, avian-cytokines, RNA interference, genetic breeding and/or development of transgenic poultry warrant further evaluation as integrated intervention strategies for control of HPAIV H5N1 in poultry.
Collapse
|
11
|
Heo YT, Lee SH, Kim T, Kim NH, Lee HT. Production of somatic chimera chicks by injection of bone marrow cells into recipient blastoderms. J Reprod Dev 2012; 58:316-22. [PMID: 22343399 DOI: 10.1262/jrd.11-119a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Several types of cells, including blastoderm cells, primordial germ cells, and embryonic germ cells were injected into early-stage recipient embryos to produce chimera avians and to gain insights into cell development. However, a limited number of studies of avian adult stem cells have also been conducted. This study is, to the best of our knowledge, the first to evaluate chicken bone marrow cells' (chBMC) ability to differentiate into multiple cell lineages and capability to generate chimera chicks. We induced random differentiation of chBMCs in vitro and injected immunologically selected pluripotent cells in chBMCs into the blastoderms of recipient eggs. The multipotency of BMCs from the barred Plymouth rock (BPR) was confirmed via AP staining, RT-PCR, immunocytochemistry, and FACS using specific markers, such as Oct-4 and SSEA-1, 3 and 4. Isolated chBMCs were found to be able to induce in vitro differentiation to multiple cell lineages. Approximately 5,000 chBMCs were injected into the blastoderms of white leghorn (WL) recipients and proved able to contribute to the generation of somatic chimera chicks with a frequency of 2.7% (2 of 73). Confirmation of chimerism in hatched chicks was achieved via PCR analysis using D-loop-specific primers of BPR and WL. Our study demonstrated the successful production of chimera chicks using chBMC. Therefore, we propose that the use of adult chBMCs may constitute a new possible approach to the production of chimera poultry, and may provide helpful studies in avian developmental biology.
Collapse
Affiliation(s)
- Young Tae Heo
- Department of Animal Science, Chungbuk National University, Chungbuk, Korea
| | | | | | | | | |
Collapse
|
12
|
|
13
|
|
14
|
Modric T, Mergia A. The Use of Viral Vectors in Introducing Genes into Agricultural Animal Species. Anim Biotechnol 2009; 20:216-30. [DOI: 10.1080/10495390903196380] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
15
|
Torne-Celer C, Moreau K, Faure C, Chebloune Y, Verdier G, Ronfort C. A novel self-deleting retroviral vector carrying an additional sequence recognized by the viral integrase (IN). Virus Res 2008; 135:72-82. [PMID: 18420298 DOI: 10.1016/j.virusres.2008.02.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2007] [Revised: 02/08/2008] [Accepted: 02/15/2008] [Indexed: 11/30/2022]
Abstract
During retroviral integration, the viral integrase recognizes the attachment (att) sequence (formed by juxtaposition of two LTRs ends) as the substrate of integration. We have developed a self-deleting Avian Leukosis and Sarcoma Viruses (ALSVs)-based retroviral vector carrying an additional copy of the att sequence, between neo and puro genes. We observed that: (i) the resulting NP3Catt vector was produced at neo and puro titers respectively smaller and higher than that of the parental vector devoid of the att sequence; (ii) 61% of NP3Catt proviruses were flanked by LTRs; most of them were deleted of internal sequences, probably during the reverse transcription step; (iii) 31% of clones were deleted of the whole 5' part of their genome and were flanked, in 5', by the additional att sequence and, in 3', by an LTR. Integration of these last proviruses was often imprecise with respect to the viral ends. At total, 77% of proviruses had lost the packaging signal and were not mobilizable by a replication-competent virus and 92% had lost the selectable gene in a single round of replication. Although still to improve, the att vector could be considered as an interesting new safe retroviral vector for gene transfer experiments.
Collapse
|
16
|
Lee SH, Gupta MK, Han DW, Han SY, Uhm SJ, Kim T, Lee HT. Development of Transgenic Chickens Expressing Human Parathormone Under the Control of a Ubiquitous Promoter by Using a Retrovirus Vector System. Poult Sci 2007; 86:2221-7. [PMID: 17878453 DOI: 10.1093/ps/86.10.2221] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Transgenic chickens, ubiquitously expressing a human protein, could be a very useful model system for studying the role of human proteins in embryonic development as well as for efficiently producing pharmaceutical drugs as bioreactors. Human parathormone (hPTH) secreted from parathyroid glands plays a significant role in calcium homeostasis and is an important therapeutic agent for the treatment of osteoporosis in humans. Here, by using a robust replication-defective Moloney murine leukemia virus-based retrovirus vector encapsidated with vesicular stomatitis virus G glycoprotein, we generated transgenic chickens expressing hPTH under the control of a ubiquitous Rous sarcoma virus promoter. The recombinant retrovirus was injected into the subgerminal cavity of freshly laid eggs at the blastodermal stage. After 21 d of incubation, 42 chicks hatched from 473 retrovirus-injected eggs. All 42 living chicks were found to express the vector-encoded hPTH gene in diverse organs, as revealed by PCR and reverse transcription-PCR analysis by using primer pairs specific for hPTH. Four days after hatching, 6 chicks died and 14 chicks showed phenotypic deformities. At 18 wk of age, only 3 G(0) chickens survived. They also released the hPTH hormone in their blood and transmitted the hPTH gene to G(1) embryos. However, although the embryos were alive at d 18 of incubation, none hatched. An electrochemiluminescence immunoassay further showed that the hPTH expression level was markedly elevated in mammalian cells infected by the retrovirus vector. Thus, we demonstrated that transgenic chickens, expressing a human protein under the control of a ubiquitous promoter, not only could be an efficient bioreactor for the production of pharmaceutical drugs, but also could be useful for studies on the role of human proteins in embryonic development. To our knowledge, this is the first report on the production of a human protein (hPTH) in transgenic chickens under the control of a ubiquitous promoter by using a replication-defective Moloney murine leukemia virus-based retrovirus vector system.
Collapse
Affiliation(s)
- S H Lee
- Department of Animal Biotechnology, Bio-Organ Research Center, Konkuk University, 1 Hwayang-dong, Gwangjin-Gu, Seoul, 143 701, South Korea
| | | | | | | | | | | | | |
Collapse
|
17
|
Affiliation(s)
- James N Petitte
- Department of Poultry Science, College of Agriculture and Life Sciences, North Carolina State University, Raleigh, NC 27695-7608, USA.
| | | |
Collapse
|
18
|
Etches RJ. The hard cell(s) of avian transgenesis. Transgenic Res 2006; 15:521-6. [PMID: 16953329 DOI: 10.1007/s11248-006-9018-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2006] [Accepted: 06/02/2006] [Indexed: 11/25/2022]
Abstract
After 25 years, the search for the avian cell that can be cultured indefinitely, genetically modified, and clonally derived while retaining its ability to enter the germline has ended. van de Lavoir et al. [2006a, Nature 441:766-769] have defined the conditions for culture and genetic modification of primordial germ cells (PGCs) and shown that these cells are transmitted at high rates through the germline. The advent of this technology provides the ability to introduce transgenes of any size and to make site-specific changes to the genome. Although PGCs are committed to the germline, they can be induced into somatically committed embryonic germ (EG) cells by changing the culture conditions. EG cells resemble embryonic stem (ES) cells that are also committed to the somatic lineages (van de Lavoir 2006b, Mech Dev 123:31-41). These cell-based systems facilitate insertion of larger transgenes that provide high level, developmentally regulated and tissue-specific expression in transgenic chimeras and their offspring. Following introduction of a transgene, high-grade somatic chimeras can be made with ES and EG cells within 4 weeks and 4 months respectively, allowing quick assessment of the transgenic phenotype. Following introduction of a tansgene into PGCs, high-grade germline chimeras can be made within 8-9 weeks and the high rate of germline transmission of G0 chimeras produces a large cohort of transgenic chicks in 16-17 weeks. PGC, EG and ES cells can be grown in conventional laboratory settings and small flocks of recipient birds or third-party vendors can supply recipient embryos to make somatic and/or germline chimeras. In general, animal management is routine although some specialized equipment and technical skill is required to incubate chimeras in surrogate shells.
Collapse
Affiliation(s)
- Robert J Etches
- Origen Therapeutics, 1450 Rollins Road, Burlingame, CA 94010, USA.
| |
Collapse
|
19
|
Wang Y, Brooks CF, Jones SA, Olliff LK, Morgan M, Speksnijder GL, Foley C, Harvey AJ. Progress Toward the Culture and Transformation of Chicken Blastodermal Cells. Stem Cells 2006; 24:1638-45. [PMID: 16822881 DOI: 10.1634/stemcells.2005-0491] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Chicken blastodermal cells can be cultured for short periods of time and retain the ability to contribute to somatic and germline tissues when injected into gamma-irradiated stage X embryos. Such a method has yet to yield a germline transgenic bird, in part due to the low rate of transgene integration into the avian genome. In addition, the short culture period precludes the identification and expansion of those cells that carry an integrated transgene. In this study, two methods were developed that produced blastodermal cells isolated from stage X Barred Plymouth Rock embryos bearing an integrated transgene. Addition of chick embryo extract to the culture medium enabled expansion of single colonies for multiple passages. Southern blot analysis indicated that the transgenes had integrated as a single copy in most of the clones. Cells from passaged, transgenic embryo cells were injected into irradiated stage X White Leghorn embryos, producing hatched chicks that bore the donor cells in their somatic tissues. Transgene sequences were detected in sperm DNA; however, breeding of chimeras did not result in germline transmission of the transgene, indicating that the contribution of the transgenic cells to the germline was either nonexistent or very low.
Collapse
Affiliation(s)
- Youliang Wang
- AviGenics, Inc., Georgia BioBusiness Center, Athens, 30605, USA
| | | | | | | | | | | | | | | |
Collapse
|
20
|
Ivarie R. Competitive bioreactor hens on the horizon. Trends Biotechnol 2006; 24:99-101. [PMID: 16445998 DOI: 10.1016/j.tibtech.2006.01.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2005] [Revised: 12/05/2005] [Accepted: 01/13/2006] [Indexed: 10/25/2022]
Abstract
The hen has long held promise as a low-cost, high-yield bioreactor for the production of human biopharmaceuticals in egg whites using genetic engineering. Two separate reports have recently appeared indicating the production of substantial levels of human monoclonal and single chain antibodies (>3 mg and >150 mg, respectively) in eggs of transgenic hens. These promising findings indicate that the hen is close to becoming a competitive manufacturing platform for the production of human biopharmaceuticals.
Collapse
Affiliation(s)
- Robert Ivarie
- Department of Genetics, University of Georgia, Athens, GA 30602-7223, USA.
| |
Collapse
|
21
|
Mozdziak PE, Wu Q, Bradford JM, Pardue SL, Borwornpinyo S, Giamario C, Petitte JN. Identification of the lacZ insertion site and beta-galactosidase expression in transgenic chickens. Cell Tissue Res 2006; 324:41-53. [PMID: 16408197 DOI: 10.1007/s00441-005-0060-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2005] [Accepted: 07/25/2005] [Indexed: 10/25/2022]
Abstract
The quail:chick chimera system is a classical research model in developmental biology. An improvement over the quail:chick chimera system would be a line of transgenic chickens expressing a reporter gene. Transgenic chickens carrying lacZ and expressing bacterial beta-galactosidase have been generated, but complete characterization of the insertion event and characterization of beta-galactosidase expression have not previously been available. The genomic sequences flanking the retroviral insertion site have now been identified by using inverse polymerase chain reaction (PCR), homozygous individuals have been identified by using PCR-based genotyping, and beta-galactosidase expression has been evaluated by using Western analysis and histochemistry. Based upon the current draft of the chicken genome, the viral insertion carrying the lacZ gene has been located on chromosome 11 within the predicted gene for neurotactin/fractalkine (CX3CL1); neurotactin mRNA expression appears to be missing from the brain of homozygous individuals. When Generation 2 (G2) lacZ-positive individuals were inter-mated, they generated 361 G3 progeny; 82 were homozyous for lacZ (22.7%), 97 were wild-type non-transgenic (26.9%), and 182 (50.4%) were hemizygous for lacZ. Western analysis revealed the highest expression in the muscle and liver. With the identification of homozygous birds, the line of chickens is now designated NCSU-Blue1.
Collapse
Affiliation(s)
- Paul E Mozdziak
- Department of Poultry Science, North Carolina State University, Raleigh, NC 27695, USA.
| | | | | | | | | | | | | |
Collapse
|
22
|
Volkova NA, Zinovieva NA, Volkova LA, Ernst LK. Retroviral-mediated gene transfer as an effective tool for the in vitro genetic transformation of chicken embryonic cells and production of transgenic chickens. RUSS J GENET+ 2006. [DOI: 10.1134/s1022795406010108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
23
|
Chicken Stem Cells as a Model to Generate Transgenic Chicken: Present and Perspectives. J Poult Sci 2006. [DOI: 10.2141/jpsa.43.313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
24
|
Scott BB, Lois C. Generation of tissue-specific transgenic birds with lentiviral vectors. Proc Natl Acad Sci U S A 2005; 102:16443-7. [PMID: 16260725 PMCID: PMC1275601 DOI: 10.1073/pnas.0508437102] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Birds are of great interest for a variety of research purposes, and effective methods for manipulating the avian genome would greatly accelerate progress in fields that rely on birds as model systems for biological research, such as developmental biology and behavioral neurobiology. Here, we describe a simple and effective method for producing transgenic birds. We used lentiviral vectors to produce transgenic quails that express GFP driven by the human synapsin gene I promoter. Expression of GFP was specific to neurons and consistent across multiple generations. Expression was sufficient to allow visualization of individual axons and dendrites of neurons in vivo by intrinsic GFP fluorescence. Tissue-specific transgene expression at high levels provides a powerful tool for biological research and opens new avenues for genetic manipulation in birds.
Collapse
Affiliation(s)
- Benjamin B Scott
- Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
| | | |
Collapse
|
25
|
Borwompinyo S, Brake J, Mozdziak PE, Petitte JN. Culture of chicken embryos in surrogate eggshells. Poult Sci 2005; 84:1477-82. [PMID: 16206571 DOI: 10.1093/ps/84.9.1477] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The chick embryo is a classical model to study embryonic development. However, most researchers have not studied the effect of embryonic manipulation on chick hatchability. The objective of this study was to determine the effect of egg orientation and type of sealing film on the hatchability of cultured embryos. Windows were made in the small end of recipient surrogate chicken eggshells, and donor embryos were placed into the recipient eggshell for the first 3 d of incubation. Survival over the first 3 d was maximized (P < 0.05) when windowed eggs sealed with Saran Wrap were positioned with the window-end down compared with window-end up. Three-day-old cultured embryos were transferred into recipient turkey eggshells, sealed with cling film, and cultured until hatch. Water weight loss of the surrogate eggshell cultures regardless of cling film type was not significantly different from control intact eggs. The embryos cultured in turkey eggshells and sealed with Handi Wrap exhibited higher hatchability (75% +/- 10.2%) than cultures sealed with Saran Wrap (45.2% +/- 13.8%). Hatchability of control intact eggs (86.4% +/- 5.3%) was not significantly (P > 0.05) different from the hatchability of eggs sealed with Handi Wrap, which suggested that Handi Wrap was an excellent sealant for chick embryos cultured after 3 d of incubation.
Collapse
Affiliation(s)
- S Borwompinyo
- Department of Poultry Science, North Carolina State University, Raleigh, North Carolina 27695, USA
| | | | | | | |
Collapse
|
26
|
Kamihira M, Ono KI, Esaka K, Nishijima KI, Kigaku R, Komatsu H, Yamashita T, Kyogoku K, Iijima S. High-level expression of single-chain Fv-Fc fusion protein in serum and egg white of genetically manipulated chickens by using a retroviral vector. J Virol 2005; 79:10864-74. [PMID: 16103139 PMCID: PMC1193598 DOI: 10.1128/jvi.79.17.10864-10874.2005] [Citation(s) in RCA: 102] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2005] [Accepted: 05/24/2005] [Indexed: 01/29/2023] Open
Abstract
We report here the generation of transgenic chickens using a retroviral vector for the production of recombinant proteins. It was found that the transgene expression was suppressed when a Moloney murine leukemia virus-based retroviral vector was injected into chicken embryos at the blastodermal stage. When a concentrated viral solution was injected into the heart of developing embryos after 50 to 60 h of incubation, transgene expression was observed throughout the embryo, including the gonads. For practical production, a retroviral vector encoding an expression cassette of antiprion single-chain Fv fused with the Fc region of human immunoglobulin G1 (scFv-Fc) was injected into chicken embryos. The birds that hatched stably produced scFv-Fc in their serum and eggs at high levels (approximately 5.6 mg/ml). We obtained transgenic progeny from a transgenic chicken generated with this procedure. The transgene was stably integrated into the chromosomes of transgenic progeny. The transgenic progeny also expressed scFv-Fc in the serum and eggs.
Collapse
Affiliation(s)
- Masamichi Kamihira
- Department of Biotechnology, Graduate School of Engineering, Nagoya University, Chikusa-ku, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Zhu L, van de Lavoir MC, Albanese J, Beenhouwer DO, Cardarelli PM, Cuison S, Deng DF, Deshpande S, Diamond JH, Green L, Halk EL, Heyer BS, Kay RM, Kerchner A, Leighton PA, Mather CM, Morrison SL, Nikolov ZL, Passmore DB, Pradas-Monne A, Preston BT, Rangan VS, Shi M, Srinivasan M, White SG, Winters-Digiacinto P, Wong S, Zhou W, Etches RJ. Production of human monoclonal antibody in eggs of chimeric chickens. Nat Biotechnol 2005; 23:1159-69. [PMID: 16127450 DOI: 10.1038/nbt1132] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2005] [Accepted: 07/12/2005] [Indexed: 12/22/2022]
Abstract
The tubular gland of the chicken oviduct is an attractive system for protein expression as large quantities of proteins are deposited in the egg, the production of eggs is easily scalable and good manufacturing practices for therapeutics from eggs have been established. Here we examined the ability of upstream and downstream DNA sequences of ovalbumin, a protein produced exclusively in very high quantities in chicken egg white, to drive tissue-specific expression of human mAb in chicken eggs. To accommodate these large regulatory regions, we established and transfected lines of chicken embryonic stem (cES) cells and formed chimeras that express mAb from cES cell-derived tubular gland cells. Eggs from high-grade chimeras contained up to 3 mg of mAb that possesses enhanced antibody-dependent cellular cytotoxicity (ADCC), nonantigenic glycosylation, acceptable half-life, excellent antigen recognition and good rates of internalization.
Collapse
MESH Headings
- Animals
- Antibodies, Monoclonal/chemistry
- Blotting, Southern
- Blotting, Western
- CHO Cells
- Calorimetry, Differential Scanning
- Carbohydrates/chemistry
- Chickens
- Cricetinae
- DNA/metabolism
- Egg White
- Embryo, Mammalian/cytology
- Embryo, Nonmammalian
- Enzyme-Linked Immunosorbent Assay
- Female
- Genetic Vectors
- Genome
- Glycosylation
- Humans
- Immunoglobulin G
- Immunohistochemistry
- Isoelectric Focusing
- Mice
- Mice, Inbred BALB C
- Models, Genetic
- Monosaccharides/chemistry
- Oligosaccharides/chemistry
- Ovalbumin/genetics
- Ovalbumin/metabolism
- Polymerase Chain Reaction
- Recombinant Fusion Proteins/chemistry
- Reverse Transcriptase Polymerase Chain Reaction
- Spectrometry, Mass, Electrospray Ionization
- Stem Cells/cytology
Collapse
Affiliation(s)
- Lei Zhu
- Origen Therapeutics, 1450 Rollins Road, Burlingame, California 94010, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Chapman SC, Lawson A, Macarthur WC, Wiese RJ, Loechel RH, Burgos-Trinidad M, Wakefield JK, Ramabhadran R, Mauch TJ, Schoenwolf GC. Ubiquitous GFP expression in transgenic chickens using a lentiviral vector. Development 2005; 132:935-40. [PMID: 15673573 DOI: 10.1242/dev.01652] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We report the first ubiquitous green fluorescent protein expression in chicks using a lentiviral vector approach, with eGFP under the control of the phosphoglycerol kinase promoter. Several demonstrations of germline transmission in chicks have been reported previously, using markers that produce tissue-specific, but not ubiquitous, expression. Using embryos sired by a heterozygous male, we demonstrate germline transmission in the embryonic tissue that expresses eGFP uniformly, and that can be used in tissue transplants and processed by in situ hybridization and immunocytochemistry. Transgenic tissue is identifiable by both fluorescence microscopy and immunolabeling, resulting in a permanent marker identifying transgenic cells following processing of the tissue. Stable integration of the transgene has allowed breeding of homozygous males and females that will be used to produce transgenic embryos in 100% of eggs laid upon reaching sexual maturity. These results demonstrate that a transgenic approach in the chick model system is viable and useful even though a relatively long generation time is required. The transgenic chick model will benefit studies on embryonic development, as well as providing the pharmaceutical industry with an economical bioreactor.
Collapse
Affiliation(s)
- Susan C Chapman
- University of Utah School of Medicine, Department of Neurobiology and Anatomy, and Children's Health Research Center, Room 401 MREB, 20 North 1900 East Salt Lake City, Utah 84132-3401, USA.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Abstract
The chick embryo is a classic model that has been used to gain insight into developmental processes and cell fate within the embryo for over a century. For the most part, investigators have implanted quail cells into a chicken embryo. A more powerful tool for developmental biology research than the quail:chick chimera system would be to have lines of transgenic chickens expressing reporter genes that are readily available to the research community. However, avian transgenic technology has been fraught with technical difficulties, and transgenic chickens expressing reporter genes have only recently been developed. The goal of this review is to report the technologies that have been used to generate transgenic chickens and to discuss the challenges in generating avian transgenics for developmental biology research.
Collapse
Affiliation(s)
- Paul E Mozdziak
- Department of Poultry Science, North Carolina State University, Raleigh, North Carolina 27695, USA.
| | | |
Collapse
|
30
|
Sang H. Prospects for transgenesis in the chick. Mech Dev 2004; 121:1179-86. [PMID: 15296981 DOI: 10.1016/j.mod.2004.05.012] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2004] [Revised: 05/20/2004] [Accepted: 05/20/2004] [Indexed: 10/26/2022]
Abstract
Research to develop a useful method for genetic modification of the chick has been on-going since the first demonstrations in the mouse in the 1980s that genetic modification is an invaluable tool for the study of gene function. Manipulation of the chick zygote is possible but inefficient. Considerable progress has been made in developing potentially pluripotent embryo stem cells and their contribution to somatic chimeric birds well-established. Germ line transmission of gametes derived from genetically modified embryo cells has not been described. Transfer of primordial germ cells from a donor embryo to a recipient and production of functional gametes from the donor-derived cells is possible. Genetic modification of primordial germ cells before transfer and their recovery through the germ line has not been achieved. The first transgenic birds described were generated using retroviral vectors. The use of lentiviral vectors may make this approach a feasible method for transgenic production, although there are limitations to the applications of these vectors. It is likely that a method will be developed in the next few years that will enable the use of transgenesis as a tool in the study of development in the chick and for many other applications in basic research and biotechnology.
Collapse
Affiliation(s)
- Helen Sang
- Roslin Institute, Roslin, Midlothian EH25 9PS, UK.
| |
Collapse
|
31
|
Rapp JC, Harvey AJ, Speksnijder GL, Hu W, Ivarie R. Biologically active human interferon alpha-2b produced in the egg white of transgenic hens. Transgenic Res 2004; 12:569-75. [PMID: 14601655 DOI: 10.1023/a:1025854217349] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We have previously described the expression of a bacterial protein in the egg white of transgenic chickens using a replication-deficient retroviral vector. Here we report the expression of a glycosylated human protein, interferon alpha-2b (hIFN), in the egg white of transgenic hens. The hIFN secreted into the egg white was biologically active as determined by a viral inhibition assay. Purification and carbohydrate analysis of the hIFN expressed in egg white revealed that two of the six major glycosylated hIFN species match the naturally occurring human hIFN glycovariants. These results support the potential of the hen as a bioreactor for the production of commercially valuable, biologically active, and glycosylated proteins in egg white.
Collapse
Affiliation(s)
- Jeffrey C Rapp
- AviGenics, Inc., Georgia BioBusiness Center, 111 Riverbend Rd., Athens, GA 30605, USA.
| | | | | | | | | |
Collapse
|
32
|
Wang CL, Hodgson JG, Malek T, Pedersen FS, Wabl M. A murine leukemia virus with Cre-LoxP excisible coding sequences allowing superinfection, transgene delivery, and generation of host genomic deletions. Retrovirology 2004; 1:5. [PMID: 15169571 PMCID: PMC419723 DOI: 10.1186/1742-4690-1-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2004] [Accepted: 04/05/2004] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND To generate a replication-competent retrovirus that could be conditionally inactivated, we flanked the viral genes of the Akv murine leukemia virus with LoxP sites. This provirus can delete its envelope gene by LoxP/Cre mediated recombination and thereby allow superinfection of Cre recombinase expressing cells. RESULTS In our studies, the virus repeatedly infected the cell and delivered multiple copies of the viral genome to the host genome; the superinfected cells expressed a viral transgene on average twenty times more than non-superinfected cells. The insertion of multiple LoxP sites into the cellular genome also led to genomic deletions, as demonstrated by comparative genome hybridization. CONCLUSION We envision that this technology may be particularly valuable for delivering transgenes and/or causing deletions.
Collapse
Affiliation(s)
- Clifford L Wang
- Department of Microbiology and Immunology, University of California, San Francisco, CA, USA, 94143-0414
| | - J Graeme Hodgson
- Department of Laboratory Medicine, University of California, San Francisco, CA, USA, 94143-0808
| | - Tiffany Malek
- Fred Hutchinson Cancer Research Centre, Department of Human Biology, Seattle, WA 98109, USA
| | - Finn Skou Pedersen
- Department of Molecular Biology and Department of Medical Microbiology and Immunology, University of Aarhus, Denmark, DK-8000
| | - Matthias Wabl
- Department of Microbiology and Immunology, University of California, San Francisco, CA, USA, 94143-0414
| |
Collapse
|
33
|
Xi Y, Nada Y, Soh T, Fujihara N, Hattori MA. Green fluorescent protein gene-transfected peafowl somatic cells participate in the development of chicken embryos. ACTA ACUST UNITED AC 2004; 301:139-49. [PMID: 14743513 DOI: 10.1002/jez.a.20021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
This study was performed to investigate whether the embryonic somatic cells are capable of reconstituting and participating in the embryonic development of chickens to produce chimeras. In order to track the migration behavior of the donor cells, a cell line, originally isolated from an Indian peafowl embryo, was fluorescent-labeled by transfection of the cells with enhanced Green Fluorescent Protein (GFP) and Neomycin resistant (Neo) genes prior to injection into the stage X blastoderm of White Leghorn chickens. The injection was performed with a medium in the presence of 1-5% polyethylene glycol. The development of putative chimeric embryos between the stages three and 24 was examined for GFP expression under fluorescent light. To trace the peafowl cells in the developing chicken embryos, both a species-specific genetic marker originating from the mitochondrial DNA cytochrome b (cyt b) gene and a DNA fragment of GFP gene were used. Of the 185 fertile eggs manipulated, 173 developed into embryos. Fifty-five of them showed positive GFP patches in extra-embryonic tissues, and 15 expressed GFP in intra-embryonic tissues such as those of the head, heart, and gonad. PCR analysis revealed that PCR fragments for the peafowl mitochondrial DNA cyt b and GFP genes were detected in the samples of the GFP positive extra- and intra-embryonic tissues of the chimeras. The present results provide evidence that fluorescent-labeled peafowl embryonic cells carrying GFP and Neo genes are able to participate in the development of chicken embryos to generate chimeras.
Collapse
Affiliation(s)
- Yongmei Xi
- Laboratory of Reproductive Physiology and Biotechnology, Department of Animal and Marine Bioresource Sciences, Graduate School Kyushu University, Fukuoka 812-8581, Japan
| | | | | | | | | |
Collapse
|
34
|
Andacht T, Hu W, Ivarie R. Rapid and improved method for windowing eggs accessing the stage X chicken embryo. Mol Reprod Dev 2004; 69:31-4. [PMID: 15278901 DOI: 10.1002/mrd.20155] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The chick stage X blastoderm is routinely accessed through a small window in a freshly laid egg. However, windowing severely compromises embryo survival with hatch rates as low as a few percent. We previously reported a simple modification to the standard method that reduced introduction of air into the sealed egg and improved the hatchability to 32%. Here, we describe an even simpler and more rapid method for sealing a windowed egg using hot glue or paraffin in which the hatch rate increased to an average of 63% of the unwindowed control eggs. The primary reason for low hatchability can be attributed to air trapped within the egg during windowing and/or leakage during incubation, as shown by increased lethality by artificially introducing air into windowed and sealed eggs. Although the hatch rate was considerably improved, air can still enter the egg during incubation and is likely to account for less than 100% hatchability of the sealed eggs. The success of this new windowing method will facilitate high throughput for the production of transgenic birds and find use in developmental biology, toxicity testing, and avian disease research.
Collapse
Affiliation(s)
- Tracy Andacht
- Department of Genetics, University of Georgia, Athens, GA 30602, USA
| | | | | |
Collapse
|
35
|
Mozdziak PE, Pophal S, Borwornpinyo S, Petitte JN. Transgenic Chickens Expressing β-Galactosidase Hydrolyze Lactose in the Intestine. J Nutr 2003; 133:3076-9. [PMID: 14519787 DOI: 10.1093/jn/133.10.3076] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Chickens do not possess the necessary enzymes to efficiently hydrolyze lactose into glucose and galactose. The bacterial enzyme beta-galactosidase can convert lactose into glucose and galactose. Transgenic chickens that carry the E. coli lacZ gene and express beta-galactosidase could potentially utilize lactose as an energy source. The objective of this study was to determine the ability of the transgenic chicken small intestinal mucosa to hydrolyze lactose into glucose and galactose. Lactase activity was examined in the intestinal muscosa from wild-type chickens and two lines of chickens that carry the lacZ gene and express beta-galactosidase. Lactase activity was significantly higher in both transgenic lines compared with wild-type birds (P < 0.05). The presence of the beta-galactosidase enzyme was revealed by X-gal staining in the intestine of transgenic chickens, whereas it was not present in the wild-type chickens. Overall, it appears that inserting the lacZ gene, which encodes beta-galactosidase, has resulted in a chicken that can utilize lactose as an energy source. This study demonstrates that transgenic technology can be used to modify nutrient utilization in domestic poultry.
Collapse
Affiliation(s)
- Paul E Mozdziak
- Department of Poultry Science, North Carolina State University, Raleigh, NC 27695, USA.
| | | | | | | |
Collapse
|
36
|
Harvey AJ, Ivarie R. Validating the hen as a bioreactor for the production of exogenous proteins in egg white. Poult Sci 2003; 82:927-30. [PMID: 12817447 DOI: 10.1093/ps/82.6.927] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Increased demand for the production of human biopharmaceuticals in transgenic organisms has led to an intensive effort to develop the hen as a bioreactor producing exogenous proteins in egg white via transgenesis. To date, however, robust methods for transgenic modification of the avian genome have been lacking. We have used a replication-defective retroviral vector derived from avian leukosis virus (ALV) to generate transgenic chickens expressing bacterial beta-lactamase secreted into serum and egg whites through several generations. Expression was driven by the ubiquitous cytomegalovirus (CMV) promoter. Here we describe results from a transgenic lineage (Harvey et al., 2002a,b) in which (1) the transgene was stably transmitted from a G1 founder male (5657) through several generations without silencing, (2) the protein was biologically active, and (3) the level of expression in egg whites was doubled in a G3 homozygote.
Collapse
Affiliation(s)
- A J Harvey
- AviGenics, Inc., Georgia BioBusiness Center, 111 Riverbend Road, Athens, Georgia 30605, USA
| | | |
Collapse
|
37
|
Sang H. 6. Genetically modified livestock and poultry and their potential effects on human health and nutrition. Trends Food Sci Technol 2003. [DOI: 10.1016/s0924-2244(03)00069-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
|
38
|
Mozdziak PE, Borwornpinyo S, McCoy DW, Petitte JN. Development of transgenic chickens expressing bacterial beta-galactosidase. Dev Dyn 2003; 226:439-45. [PMID: 12619130 DOI: 10.1002/dvdy.10234] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Replication-defective retroviral vectors are efficient vehicles for the delivery of exogenous genes, and they may be used in the generation of transgenic animals. The replication-defective retroviral SNTZ vector carrying the lacZ gene with a nuclear localized signal was injected into the subgerminal cavity of freshly laid eggs. Subsequently, the eggs were allowed to hatch, and the chickens were screened for the lacZ gene by using the polymerase chain reaction. Eight of 15 male chickens that survived to sexual maturity contained the lacZ gene in their semen. Subsequently, these males were mated with wild-type female chickens. From one of the eight lacZ-positive G(0) males, two lacZ-positive male chickens were produced from a total of 224 G(1) progeny for a germline transmission rate of 0.89%. Both G(1) male chickens carrying the lacZ gene were mated with wild-type female chickens and 46.5% of the G(2) progeny contained the lacZ gene, which is consistent with the expected Mendelian 50% ratio for a heterozygous dominant allele. The product of the lacZ gene, nuclear localized beta-galactosidase, was expressed in primary myoblast cultures derived from G(2) chickens, and it was also expressed in whole G(2) chicken embryos.
Collapse
Affiliation(s)
- P E Mozdziak
- Department of Poultry Science, North Carolina State University, Raleigh, North Carolina 27695, USA.
| | | | | | | |
Collapse
|
39
|
Abstract
The hen has long held promise as a low cost, high-yield bioreactor for the production of human biopharmaceuticals in egg whites. A typical egg white contains 3.5-4.0 grams of protein, more than half of which comes from a single gene (ovalbumin). Harnessing the power of the gene to express a recombinant protein could yield up to a gram or more of the protein in the naturally sterile egg. Accordingly, a major effort has been underway for more than a decade to develop robust methods for modification of the chicken genome. This effort intensified in the mid-1990s when several avian transgenic companies entered the scene. Progress has been made in that time but much remains to be done.
Collapse
Affiliation(s)
- Robert Ivarie
- Department of Genetics, University of Georgia, Athens, GA, 30602-7223, USA.
| |
Collapse
|
40
|
Harvey AJ, Speksnijder G, Baugh LR, Morris JA, Ivarie R. Expression of exogenous protein in the egg white of transgenic chickens. Nat Biotechnol 2002; 20:396-9. [PMID: 11923848 DOI: 10.1038/nbt0402-396] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Using a replication-deficient retroviral vector based on the avian leukosis virus (ALV), we inserted into the chicken genome a transgene encoding a secreted protein, beta-lactamase, under the control of the ubiquitous cytomegalovirus (CMV) promoter. Biologically active beta-lactamase was secreted into the serum and egg white of four generations of transgenic chickens. The expression levels were similar in successive generations, and expression levels in the magnum of the oviduct were constant over at least 16 months in transgenic hens, indicating that the transgene was stable and not subject to silencing. These results support the potential of the hen as a bioreactor for the production of commercially valuable, biologically active proteins in egg white.
Collapse
Affiliation(s)
- Alex J Harvey
- AviGenics, Inc., Georgia BioBusiness Center, 111 Riverbend Rd., Athens, GA 30605, USA.
| | | | | | | | | |
Collapse
|
41
|
|