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Vats P, Kaushik R, Rawat N, Sharma A, Sharma T, Dua D, Singh MK, Palta P, Singla SK, Manik RS, Chauhan MS. Production of Transgenic Handmade Cloned Goat ( Capra hircus) Embryos by Targeted Integration into Rosa 26 Locus Using Transcription Activator-like Effector Nucleases. Cell Reprogram 2021; 23:250-262. [PMID: 34348041 DOI: 10.1089/cell.2021.0011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Transgenic goats are ideal bioreactors for the production of therapeutic proteins in their mammary glands. However, random integration of the transgene within-host genome often culminates in unstable expression and unpredictable phenotypes. Targeting desired genes to a safe locus in the goat genome using advanced targeted genome-editing tools, such as transcription activator-like effector nucleases (TALENs) might assist in overcoming these hurdles. We identified Rosa 26 locus, a safe harbor for transgene integration, on chromosome 22 in the goat genome for the first time. We further demonstrate that TALEN-mediated targeting of GFP gene cassette at Rosa 26 locus exhibited stable and ubiquitous expression of GFP gene in goat fetal fibroblasts (GFFs) and after that, transgenic cloned embryos generated by handmade cloning (HMC). The transfection of GFFs by the TALEN pair resulted in 13.30% indel frequency at the target site. Upon cotransfection with TALEN and donor vectors, four correctly targeted cell colonies were obtained and all of them showed monoallelic gene insertions. The blastocyst rate for transgenic cloned embryos (3.92% ± 1.12%) was significantly (p < 0.05) lower than cloned embryos (7.84% ± 0.68%) used as control. Concomitantly, 2 out of 15 embryos of morulae and blastocyst stage (13.30%) exhibited site-specific integration. In conclusion, the present study demonstrates TALEN-mediated transgene integration at Rosa 26 locus in caprine fetal fibroblasts and the generation of transgenic cloned embryos using HMC.
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Affiliation(s)
- Preeti Vats
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Ramakant Kaushik
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Nidhi Rawat
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Ankur Sharma
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Tushar Sharma
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Diksha Dua
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Manoj Kumar Singh
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Prabhat Palta
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Suresh Kumar Singla
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Radhey Sham Manik
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
| | - Manmohan Singh Chauhan
- Embryo Biotechnology Laboratory, Animal Biotechnology Centre, ICAR-National Dairy Research Institute, Karnal, India
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Xu W, Cui J, Liu B, Yang L. An Event-Specific Real-Time PCR Method for Measuring Transgenic Lysozyme Goat Content in Trace Samples. Foods 2021; 10:foods10050925. [PMID: 33922422 PMCID: PMC8146569 DOI: 10.3390/foods10050925] [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] [Received: 02/05/2021] [Revised: 03/23/2021] [Accepted: 03/27/2021] [Indexed: 12/26/2022] Open
Abstract
Lysozymes are used in sterilisation, antisepsis, dairy additives, inflammation, and cancer. One transgenic goat line expressing high levels of human lysozyme (hLZ) in goat milk has been developed in China. Herein, we established an event-specific real-time polymerase chain reaction (real-time PCR) method to detect the transgenic hLZ goat line. The developed method has high specificity, sensitivity and accuracy, and a wide quantitative dynamic range. The limit of detection and limit of quantification was 5 and 10 copies per reaction, respectively. The practical sample analysis results showed that the method could identify and quantify transgenic lysozyme content in trace samples in routine lab analyses. Furthermore, the potential applicability in risk assessment, such as molecular characterisation and gene horizontal transfer, was confirmed. We believe that this method is suitable for the detection of transgenic hLZ goat line and its derivate.
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Affiliation(s)
- Wenting Xu
- Joint International Research Laboratory, Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China;
| | - Jinjie Cui
- State Key Laboratory, Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang 455000, China;
| | - Biao Liu
- Key Laboratory on Biosafety, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China;
| | - Litao Yang
- Joint International Research Laboratory, Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China;
- Correspondence:
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Li G, Shi W, Chen G, Chen H, Jiao H, Yan H, Ji M, Sun H. Construction and in vivo evaluation of a mammary gland-specific expression vector for human lysozyme. Plasmid 2014; 76:47-53. [PMID: 25280784 DOI: 10.1016/j.plasmid.2014.09.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 09/23/2014] [Accepted: 09/25/2014] [Indexed: 01/13/2023]
Abstract
A mammary gland-specific expression vector p205C3 was constructed with the 5'- and 3'-flanking regions of β-lactoglobulin gene and the first intron of β-casein gene of Chinese dairy goat as regulatory sequences. Human lysozyme (hLYZ) cDNA from mammary gland was cloned into p205C3 and the recombinant vector was used to generate transgenic mice by microinjection. Based on the lysoplate assay, four female offspring of one male founder were detected expressing recombinant hLYZ in their milk at the levels of 5-200 mg/l, and the expressed protein had the same molecular weight as that of normal hLYZ. Besides mammary glands, ectopic expressions were also found in the spleens and the small intestines of the transgenic mice. Among the offspring, the female transgenic mice maintained and expressed the transgene stably with a highest expression level of 750 mg/l. Therefore, p205C3 could be used to develop animal mammary gland bioreactors expressing hLYZ.
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Affiliation(s)
- Guocai Li
- Department of Pathogeniology and Immunology, Yangzhou University School of Medicine, Yangzhou 225001, China; Jiangsu Key Laboratory of Zoonosis/Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China; Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou 225001, China.
| | - Weiqing Shi
- Department of Pathology, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing 210009, China
| | - Gang Chen
- Jiangsu Key Laboratory of Zoonosis/Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Hongju Chen
- Department of Pathogeniology and Immunology, Yangzhou University School of Medicine, Yangzhou 225001, China; Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou 225001, China
| | - Hongmei Jiao
- Department of Pathogeniology and Immunology, Yangzhou University School of Medicine, Yangzhou 225001, China; Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou 225001, China
| | - Hua Yan
- Department of Pathogeniology and Immunology, Yangzhou University School of Medicine, Yangzhou 225001, China; Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou 225001, China
| | - Mingchun Ji
- Department of Pathogeniology and Immunology, Yangzhou University School of Medicine, Yangzhou 225001, China; Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou 225001, China
| | - Huaichang Sun
- Jiangsu Key Laboratory of Zoonosis/Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
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Feng X, Cao S, Wang H, Meng C, Li J, Jiang J, Qian Y, Su L, He Q, Zhang Q. Production of transgenic dairy goat expressing human α-lactalbumin by somatic cell nuclear transfer. Transgenic Res 2014; 24:73-85. [PMID: 25139669 DOI: 10.1007/s11248-014-9818-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2013] [Accepted: 07/17/2014] [Indexed: 11/30/2022]
Abstract
Production of human α-lactalbumin (hα-LA) transgenic cloned dairy goats has great potential in improving the nutritional value and perhaps increasing the yield of dairy goat milk. Here, a mammary-specific expression vector 5A, harboring goat β-lactoglobulin (βLG) promoter, the hα-LA gene, neo(r) and EGFP dual markers, was constructed. Then, it was effectively transfected into goat mammary epithelial cells (GMECs) and the expression of hα-LA was investigated. Both the hα-LA transcript and protein were detected in the transfected GMECs after the induction of hormonal signals. In addition, the 5A vector was introduced into dairy goat fetal fibroblasts (transfection efficiency ≈60-70%) to prepare competent transgenic donor cells. A total of 121 transgenic fibroblast clones were isolated by 96-well cell culture plates and screened with nested-PCR amplification and EGFP fluorescence. After being frozen for 8 months, the transgenic cells still showed high viabilities, verifying their ability as donor cells. Dairy goat cloned embryos were produced from these hα-LA transgenic donor cells by somatic cell nuclear transfer (SCNT), and the rates of fusion, cleavage, and the development to blastocyst stages were 81.8, 84.4, and 20.0%, respectively. A total of 726 reconstructed embryos derived from the transgenic cells were transferred to 74 recipients and pregnancy was confirmed at 90 days in 12 goats. Of six female kids born, two carried hα-LA and the hα-LA protein was detected in their milk. This study provides an effective system to prepare SCNT donor cells and transgenic animals for human recombinant proteins.
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Affiliation(s)
- Xiujing Feng
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing, Jiangsu, 210014, China
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Yuan YG, An L, Yu B, Song S, Zhou F, Zhang L, Gu Y, Yu M, Cheng Y. Expression of recombinant human alpha-lactalbumin in the milk of transgenic goats using a hybrid pomoter/enhancer. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2014; 2014:281031. [PMID: 24527256 PMCID: PMC3913203 DOI: 10.1155/2014/281031] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 12/20/2013] [Indexed: 06/03/2023]
Abstract
To improve nutrient content of goat milk, we describe the construction of a vector (pBLAC) containing a hybrid goat β -lactoglobulin (BLG) promoter/cytomegalovirus (CMV) enhancer. We also describe the generation of transgenic goats expressing rhLA by somatic cell nuclear transfer (SCNT). Of 334 one-cell stage embryos derived from three transgenic cell lines and 99 embryos derived from non-transgenic (NT) cells surgically transferred to the oviducts of 37 recipients, two recipients delivered two kids (2%) from the non-transfected line and five recipients delivered six kids (1.8%) from transgenic cell lines, three of which died within 2 days. Compared to the NT donor cells, transfection of donor cells does not negatively affect the development of nuclear transfer embryos into viable transgenic offspring. However, the clone efficiency in cell line number 1 was lower than that in numbers 2 and 3, and in the NT lines (0.9% versus 1.9% 2.4% and 2%; P < 0.05). Two transgenic cloned goats expressed rhLA in the milk at 0.1-0.9 mg/mL. The mammary gland-specific expression vector pBLAC with hybrid BLG/CMV can drive the hLA gene to express in vitro and in vivo. These data establish the basis for use of a hybrid promoter/enhancer strategy to produce rhLA transgenic goats.
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Affiliation(s)
- Yu-Guo Yuan
- College of Veterinary Medicine and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Liyou An
- College of Veterinary Medicine and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Baoli Yu
- College of Veterinary Medicine and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Shaozheng Song
- College of Veterinary Medicine and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Feng Zhou
- College of Veterinary Medicine and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Liqing Zhang
- College of Veterinary Medicine and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Yinyin Gu
- College of Veterinary Medicine and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Minghui Yu
- College of Veterinary Medicine and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Yong Cheng
- College of Veterinary Medicine and Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu 225009, China
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