轉(zhuǎn)人β防御素-3基因牛奶食用安全性評價
[Abstract]:With the development of modern molecular biology, animal embryology and gametes bioengineering, many kinds of transgenic livestock have been successfully developed, and have shown a broad application prospect in biological basic research, medicine, agriculture, environmental protection and other fields. At the same time, the safety of GM food has become the focus of attention. Therefore, the safety or not of genetically modified food is of great significance to the development of transgenic technology, the promotion of transgenic food and the solution of global food shortage. Based on the principle of substantial equivalence published by FDA/WHO, the precedent of plant transgenic safety research and the national standards and food safety standards of the Ministry of Agriculture on the safety of genetically modified foods, the nutritional composition of milk with 尾 -defensin 3 gene was analyzed. The food safety of transgenic milk was evaluated by bioinformatics analysis of exogenous protein and experiment of food safety of transgenic food feeding mice. The implementation of this study provides a certain experimental and theoretical basis for the later application of transgenic animal products, and provides a preliminary exploration for the establishment of a safety detection system for transgenic animals and their products. 1. Nutritional composition Analysis of Milk in this study, the basic nutritional components (including fat, total protein content, lactose content, PH,) of two kinds of milk were compared using human 尾 -defensin 3 gene milk as experimental sample and ordinary milk as control. Non-fat milk solid), amino acids, main mineral elements (including Ca,Mg,P,K,Na,Fe,Zn,Se), vitamins (including vitamin A, life line E, vitamin C, vitamin B1, vitamin B2). The results showed that there was no significant difference in nutritional composition of human 尾 -defensin 3 gene milk compared with that of common milk. 2. Bioinformatics analysis of human 尾-defensin 3 protein using Pepetide Mass,ProtParam tool and Portscale in ExPASy website. The homologous sequences of human 尾 -defensin 3 and sensitized protein were compared by using SDAP and Farrp databases, and the sensitivities of human 尾 -defensin 3 were obtained by using PDB and PHYRE databases for three-dimensional structural tube alignment. The results were as follows: 1) Human 尾 -defensin 3 was not derived from eight major allergens, 2) the physical and chemical properties predicted that human 尾 -defensin 3 was an unstable protein. 3) Bioinformatics analysis showed that human 尾 -defensin 3 had no homologous sequence with the sensitized protein in the database, suggesting that 尾 -defensin 3 was not sensitized. 3. The mice were divided into three groups: human 尾 -defensin 3 gene milk group, normal milk group and blank control group. After 30 days of feeding, the mice in each experimental group were anesthetized intraperitoneally, and blood was collected from the heart for routine hematological examination and biochemical index detection. After blood collection, the brain, heart, lung, liver, spleen, stomach, large intestine, small intestine, kidney and other main organs of the mice were taken for HE staining. The results showed that there were no significant differences in hematological and serum biochemical indexes among the experimental groups, and there were no abnormalities in gross anatomy and pathology.
【學位授予單位】:西北農(nóng)林科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TS252.1
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