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Xin X, Liu X, Li X, Ding X, Yang S, Jin C, Li G, Guo H. Comparative muscle proteomics/phosphoproteomics analysis provides new insight for the biosafety evaluation of fat-1 transgenic cattle. Transgenic Res 2017; 26:625-638. [DOI: 10.1007/s11248-017-0032-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Accepted: 07/04/2017] [Indexed: 02/03/2023]
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BAC mediated transgenic Large White boars with FSHα/β genes from Chinese Erhualian pigs. Transgenic Res 2016; 25:693-709. [PMID: 27229510 DOI: 10.1007/s11248-016-9963-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 05/19/2016] [Indexed: 10/21/2022]
Abstract
Follicle-stimulating hormone (FSH) is a critical hormone regulating reproduction in mammals. Transgenic mice show that overexpression of FSH can improve female fecundity. Using a bacterial artificial chromosome (BAC) system and somatic cell nuclear transfer, we herein generated 67 Large White transgenic (TG) boars harboring FSHα/β genes from Chinese Erhualian pigs, the most prolific breed in the world. We selected two F0 TG boars for further breeding and conducted molecular characterization and biosafety assessment for F1 boars. We showed that 8-9 copies of exogenous FSHα and 5-6 copies of exogenous FSHβ were integrated into the genome of transgenic pigs. The inheritance of exogenous genes conforms to the Mendel's law of segregation. TG boars had higher levels of serum FSH, FSHα mRNA in multiple tissues, FSHβ protein in pituitary and more germ cells per seminiferous tubule compared with their wild-type half sibs without any reproductive defects. Analysis of growth curve, hematological and biochemical parameters and histopathology illustrated that TG boars grew healthily and normally. By applying 16S rRNA gene sequencing, we demonstrated that exogenous genes had no impact on the bacterial community structures of pig guts. Moreover, foreign gene drift did not occur as verified by horizontal gene transfer. Our findings indicate that overexpression of FSH could improve spermatogenesis ability of boars. This work provides insight into the effect of FSHα/β genes on male reproductive performance on pigs by a BAC-mediated transgenic approach.
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Wang Q, Qian L, Jiang S, Cai C, Ma D, Gao P, Li H, Jiang K, Tang M, Hou J, Liu J, Cui W. Safety Evaluation of Neo Transgenic Pigs by Studying Changes in Gut Microbiota Using High-Throughput Sequencing Technology. PLoS One 2016; 11:e0150937. [PMID: 26966911 PMCID: PMC4788350 DOI: 10.1371/journal.pone.0150937] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 02/22/2016] [Indexed: 11/19/2022] Open
Abstract
The neo (neomycin phosphotransferase) gene is widely used as a selection marker in the production of genetically engineered animals and plants. Recent attention has been focused on safety concerns regarding neo transgene expression. In this study, neo transgenic and non-transgenic piglets were randomly assigned into Group A and Group B to evaluate effects of neo transgene by studying changes in gut microbiota using high-throughput sequencing. Group A pigs were fed a standard diet supplemented with antibiotic neomycin; Group B pigs were fed a standard diet. We examined horizontal transfer of exogenous neo gene using multiplex PCR; and investigated if the presence of secreted NPT II (neo expression product) in the intestine could lead to some protection against neomycin in transgenic pigs by monitoring different patterns of changes in gut microbiota in Group A animals. The unintended effects of neo transgene on gut microbiota were studied in Group B animals. Horizontal gene transfer was not detected in gut microbiota of any transgenic pigs. In Group A, a significant difference was observed between transgenic pigs and non-transgenic pigs in pattern of changes in Proteobacteria populations in fecal samples during and post neomycin feeding. In Group B, there were significant differences in the relative abundance of phyla Firmicutes, Bacteroidetes and Proteobacteria, and genera Lactobacillus and Escherichia-Shigella-Hafnia between transgenic pigs and non-transgenic pigs. We speculate that the secretion of NPT II from transgenic tissues/cells into gut microbiota results in the inhibition of neomycin activity and the different patterns of changes in bacterial populations. Furthermore, the neo gene also leads to unintended effects on gut microbiota in transgenic pigs that were fed with basic diet (not supplemented with neomycin). Thus, our data in this study caution that wide use of the neo transgene in genetically engineered animals should be carefully considered and fully assessed.
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Affiliation(s)
- Qingqing Wang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P R China
| | - Lili Qian
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P R China
- State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing, 100193, P R China
| | - Shengwang Jiang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P R China
| | - Chunbo Cai
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P R China
- State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing, 100193, P R China
| | - Dezun Ma
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P R China
| | - Pengfei Gao
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P R China
- Department of Bioengineering and Biotechnology, College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao, 266042, P R China
| | - Hegang Li
- Institute of Animal Sciences, Qingdao, 266100, P R China
| | - Ke Jiang
- Institute of Animal Sciences, Qingdao, 266100, P R China
| | - Maoxue Tang
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P R China
| | - Jian Hou
- State Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing, 100193, P R China
| | - Jie Liu
- Department of Bioengineering and Biotechnology, College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao, 266042, P R China
| | - Wentao Cui
- Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, P R China
- * E-mail:
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The use of genetic engineering techniques to improve the lipid composition in meat, milk and fish products: a review. Animal 2014; 9:696-706. [PMID: 25500170 DOI: 10.1017/s1751731114003012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The health-promoting properties of dietary long-chain n-3 polyunsaturated fatty acids (n-3 LCPUFAs) for humans are well-known. Products of animal-origin enriched with n-3 LCPUFAs can be a good example of functional food, that is food that besides traditionally understood nutritional value may have a beneficial influence on the metabolism and health of consumers, thus reducing the risk of various lifestyle diseases such as atherosclerosis and coronary artery disease. The traditional method of enriching meat, milk or eggs with n-3 LCPUFA is the manipulation of the composition of animal diets. Huge progress in the development of genetic engineering techniques, for example transgenesis, has enabled the generation of many kinds of genetically modified animals. In recent years, one of the aims of animal transgenesis has been the modification of the lipid composition of meat and milk in order to improve the dietetic value of animal-origin products. This article reviews and discusses the data in the literature concerning studies where techniques of genetic engineering were used to create animal-origin products modified to contain health-promoting lipids. These studies are still at the laboratory stage, but their results have demonstrated that the transgenesis of pigs, cows, goats and fishes can be used in the future as efficient methods of production of healthy animal-origin food of high dietetic value. However, due to high costs and a low level of public acceptance, the introduction of this technology to commercial animal production and markets seems to be a distant prospect.
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Tang MX, Zheng XM, Hou J, Qian LL, Jiang SW, Cui WT, Li K. Horizontal gene transfer does not occur between sFat-1 transgenic pigs and nontransgenic pigs. Theriogenology 2012; 79:667-72. [PMID: 23265929 DOI: 10.1016/j.theriogenology.2012.11.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2012] [Revised: 11/24/2012] [Accepted: 11/25/2012] [Indexed: 11/30/2022]
Abstract
We previously generated and characterized synthesized fatty acid desaturase-1 (sFat-1) transgenic pigs that had increased concentrations of ω-3 unsaturated fatty acid in their meat. The objective was to assess whether the inserted foreign gene in sFat-1 transgenic pigs was able to transfer and integrate into the genome of nontransgenic pigs by suckling or mating. Tests for suckling-mediated horizontal gene transfer (HGT) included sFat-1 transgenic sows nursing nontransgenic piglets and sFat-1 transgenic piglets suckling nontransgenic sows. Tests for mating-mediated HGT were performed by male sFat-1 transgenic pigs mated with nontransgenic females and female sFat-1 transgenic pigs mated with nontransgenic males. Polymerase chain reaction was used to detect the sFat-1 gene fragment in various tissues sampled from nontransgenic pigs. The foreign target gene sFat-1 was not detected in the genomic DNA of various tissues and organs sampled from nontransgenic pigs. Therefore, we concluded that HGT from transgenic pigs to wild type pigs via suckling or mating was unlikely.
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Affiliation(s)
- M X Tang
- Key Laboratory of Farm Animal Genetic Resources and Utilization & Inspection Test Center for Biosafety of Genetically Modified Animal and Feed, the Ministry of Agriculture of China (Beijing), Chinese Academy of Agricultural Sciences, Beijing, PR China
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Zhao J, Xu J, Wang J, Zhao Y, Zhang L, He J, Chu M, Li N. Impacts of human lysozyme transgene on the microflora of pig feces and the surrounding soil. J Biotechnol 2012; 161:437-44. [PMID: 22750647 DOI: 10.1016/j.jbiotec.2012.05.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2012] [Revised: 05/10/2012] [Accepted: 05/19/2012] [Indexed: 12/21/2022]
Abstract
The rapid development of genetic engineering and extensive applications of genetically engineered (GE) animals have provided many research benefits, but concerns have been raised over the potential environmental impact of transgenic animals. We investigated the effects of human lysozyme (hLZ) transgenic pigs which can express hLZ in their mammary glands on the surrounding environment from the angle of the changes of pig feces and the surrounding soil, including the probability of horizontal gene transfer (HGT), the impact on microbial communities in pig gastrointestinal (GI) tracts and soil, and the influence on the total nitrogen (TN) and total phosphorus (TP) content of pig excrement and surrounding soil. Results showed that hLZ gene was not detected by polymerase chain reaction (PCR) or quantitative real-time PCR (Q-PCR) in gut microbial DNA extracts of manure or microbial DNA extracts of topsoil. PCR-Denaturing Gradient Gel Electrophoresis (PCR-DGGE) analysis and 16S rDNA sequence analysis showed that hLZ gene had no impact on the microflora structure of pig guts or soil. Finally, TN and TP contents were not significantly different in pig manure or soils taken at different distances from the pig site (P>0.25).
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Affiliation(s)
- Jie Zhao
- State Key Laboratory for Agrobiotechnology, College of Biological Science, China Agricultural University, Haidian District, Beijing 100193, People's Republic of China
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