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Fang Y, Xia W, Cai W, Zhang X, Zhang J, Fu X, Li S, Fang X, Sun S, Wang Z, Zhang X, Zhu S, Li J. Effects of TLR4 overexpression on sperm quality, seminal plasma biomarkers, sperm DNA methylation and pregnancy rate in sheep. Theriogenology 2019; 142:368-375. [PMID: 31711688 DOI: 10.1016/j.theriogenology.2019.10.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 10/04/2019] [Accepted: 10/09/2019] [Indexed: 11/28/2022]
Abstract
Genetic modification provides a means to enhancing disease resistance in animals. In this study, the first generation of genetically modified (GM) sheep overexpressing TLR4 was produced by microinjection for better disease resistance. To compare semen characteristics including sperm quality, seminal plasma biochemical index, sperm DNA methylation and pregnancy rate of three-year old transgenic sheep with TLR4 overexpressed (toll like receptor 4, TLR4) and non-transgenic ram. Sixteen transgenic ram of F0 generation were produced by microinjection of the TLR4 plasmid into the pronucleus of fertilized ova. Seven transgenic sheep of F1 generation was produced by breeding F0 transgenic founders with non-transgenic sheep of the same breed. There were no significant differences between transgenic and control rams for all semen quality parameters, including semen volume, sperm concentration, sperm viability, and percentages of sperm with an intact plasma membrane, acrosomal integrity, and viable sperm with high mitochondrial membrane potential in both F0 and F1 generation. Furthermore, no significant differences were found for seminal plasma concentrations of zinc, neutral alpha-glucosidase, acid phosphatase or fructose, nor for levels of H19 and IGF2R methylation in sperm DNA. In addition, pregnancy rate was also similar between these two groups. In conclusion, there was no evidence that TLR4 overexpression altered the sperm quality, seminal plasma or sperm DNA of transgenic sheep.
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Affiliation(s)
- Yi Fang
- College of Animal Science and Technology, Hebei Agricultural University, Baoding, China; College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China; Jilin Provincial Key Laboratory of Grassland Farming, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, Jilin, 130062, China
| | - Wei Xia
- College of Life Science and Technology, Southwest Minzu University, Chengdu, China
| | - Wentao Cai
- College of Animal Science and Technology, Hebei Agricultural University, Baoding, China
| | - Xiaosheng Zhang
- Animal Husbandry and Veterinary Research Institute of Tianjin, Tianjin, China
| | - Jinlong Zhang
- Animal Husbandry and Veterinary Research Institute of Tianjin, Tianjin, China
| | - Xiangwei Fu
- College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China
| | - Sa Li
- College of Animal Science and Technology, Hebei Agricultural University, Baoding, China
| | - Xiaohuan Fang
- College of Animal Science and Technology, Hebei Agricultural University, Baoding, China
| | - Shuchun Sun
- College of Animal Science and Technology, Hebei Agricultural University, Baoding, China; Research Center of Cattle and Sheep Embryo Engineering Technique of Hebei Province, Baoding, China
| | - Zhigang Wang
- College of Animal Science and Technology, Hebei Agricultural University, Baoding, China; Research Center of Cattle and Sheep Embryo Engineering Technique of Hebei Province, Baoding, China
| | - Xiaolei Zhang
- College of Life Science and Technology, Southwest Minzu University, Chengdu, China
| | - Shien Zhu
- College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China.
| | - Junjie Li
- College of Animal Science and Technology, Hebei Agricultural University, Baoding, China; Research Center of Cattle and Sheep Embryo Engineering Technique of Hebei Province, Baoding, China.
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Coelho AC, García Díez J. Biological Risks and Laboratory-Acquired Infections: A Reality That Cannot be Ignored in Health Biotechnology. Front Bioeng Biotechnol 2015; 3:56. [PMID: 25973418 PMCID: PMC4412124 DOI: 10.3389/fbioe.2015.00056] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 04/10/2015] [Indexed: 12/16/2022] Open
Abstract
Advances and research in biotechnology have applications over a wide range of areas, such as microbiology, medicine, the food industry, agriculture, genetically modified organisms, and nanotechnology, among others. However, research with pathogenic agents, such as virus, parasites, fungi, rickettsia, bacterial microorganisms, or genetic modified organisms, has generated concern because of their potential biological risk - not only for people, but also for the environment due to their unpredictable behavior. In addition, concern for biosafety is associated with the emergence of new diseases or re-emergence of diseases that were already under control. Biotechnology laboratories require biosafety measures designed to protect their staff, the population, and the environment, which may be exposed to hazardous organisms and materials. Laboratory staff training and education is essential, not only to acquire a good understanding about the direct handling of hazardous biological agents but also knowledge of the epidemiology, pathogenicity, and human susceptibility to the biological materials used in research. Biological risk can be reduced and controlled by the correct application of internationally recognized procedures such as proper microbiological techniques, proper containment apparatus, adequate facilities, protective barriers, and special training and education of laboratory workers. To avoid occupational infections, knowledge about standardized microbiological procedures and techniques and the use of containment devices, facilities, and protective barriers is necessary. Training and education about the epidemiology, pathogenicity, and biohazards of the microorganisms involved may prevent or decrease the risk. In this way, the scientific community may benefit from the lessons learned in the past to anticipate future problems.
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Affiliation(s)
- Ana Cláudia Coelho
- Department of Veterinary Sciences, Veterinary and Animal Science Center (CECAV), School of Agrarian and Veterinary Sciences, University of Trás-os-Montes e Alto Douro, Vila Real, Portugal
| | - Juan García Díez
- Department of Veterinary Sciences, Veterinary and Animal Science Center (CECAV), School of Agrarian and Veterinary Sciences, University of Trás-os-Montes e Alto Douro, Vila Real, Portugal
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Xu J, Zhao J, Wang J, Zhao Y, Zhang L, Chu M, Li N. Molecular-based environmental risk assessment of three varieties of genetically engineered cows. Transgenic Res 2011; 20:1043-54. [DOI: 10.1007/s11248-010-9477-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Accepted: 12/15/2010] [Indexed: 12/11/2022]
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Liu B, Shu C, Xue K, Zhou K, Li X, Liu D, Zheng Y, Xu C. The oral toxicity of the transgenic Bt+CpTI cotton pollen to honeybees (Apis mellifera). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2009; 72:1163-9. [PMID: 19285343 DOI: 10.1016/j.ecoenv.2009.02.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2008] [Revised: 02/09/2009] [Accepted: 02/10/2009] [Indexed: 05/03/2023]
Abstract
Transgenic insect-resistant cotton has been planted in China in a large scale and may have adverse impacts on honeybees. Pollens from the transgenic Cry1Ac+CpTI cotton Zhong-41 and the parental cotton Zhong-23 were collected from the field and their impacts on adult worker bees were assessed. Experimental results showed that Zhong-41 pollen had no acute oral toxic effect on worker bees. No significant differences were observed in the superoxide dismutase activity or in the longevity of worker bees fed with diets containing the two cotton pollens. The main reasons for the outcome may be the low expression level of the transgenic proteins Cry1Ac and CpTI in the pollen of Zhong-41 as well as the substantial equivalence in the amounts of gross protein and soluble saccharides for the two cotton pollens. The implications of these results are discussed and further work to be carried out is put forward.
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Affiliation(s)
- Biao Liu
- State Key Biosafety Laboratory, Nanjing Institute of Environmental Sciences (NIES), Ministry of Environmental Protection of China, Nanjing, Jiangsu 210042, China.
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