豬卵母細胞體外成熟及單精注射制備胚胎的研究
[Abstract]:It is a new transgenic technology to prepare transgenic animals by combining (SMGT) with single sperm injection (ICSI), but its feasibility and efficiency have been proved by experiments in many species. With the development of embryo biotechnology, the quality of oocytes matured in vitro is increasing day by day. At present, the cytoplasmic maturity of mature oocytes obtained by in vitro culture is still less than that of mature oocytes in vivo, and the factors affecting the quality of in vitro maturation of oocytes are controlled by the time of in vitro maturation culture. In vitro maturation medium, different additives, methods of oocyte acquisition and oocyte quality, and so on. Therefore, these links need to be optimized. The purpose of this experiment is to study how to select suitable oocytes from a large number of oocytes for in vitro maturation culture in order to obtain more high-quality oocytes. In this paper, the in vitro fertilization and parthenogenetic activation of porcine oocytes were studied using porcine oocytes matured in vitro. At the same time, the preparation of embryos by single sperm microinjection was also explored. According to the number and integrity of cumulus cells, porcine oocytes were divided into three groups: group A, group B, and group C. The oocytes were cultured in vitro and matured in vitro for 44 hours to observe the efflux of the first polar body of oocytes. The results showed that the first polar body efflux rate of oocytes in A, B and C groups were 68.94% vs 47.94% vs 31.65%, respectively. The results showed that the first polar body efflux rate of oocytes in A group was significantly higher than that in B and C groups. There was a significant difference between group A and group B (p0.01), A group and C group; p0.0]), B group and C group had significant difference in pbI efflux rate (p0.01). A, B, A, B, P < 0.01, P < 0.01). The parthenogenetic activation test of oocytes in group C was performed. The cleavage of oocytes was observed for 24 hours in vitro, and blastocysts were observed for 5 days after culture in vitro. The results were as follows: a, B, A, B. The cleavage rate of oocytes in group C was 87.72%, 82.38% and 52.94% respectively after 24 h culture. There was no significant difference in cleavage rate between group A and group B (p0.05), A,). The cleavage rate of oocytes in group C was significantly different (p0.0), that in group B was significantly different from that in group C (p0.01). The blastocyst rate of oocytes in group A, B and C was 10.96% at the 5th to 6th day of culture, respectively, and the blastocyst rate of oocytes in group C was 10.96% after 5-6 days of culture. The oocyte blastocyst rate in group A was higher than that in group B and C, and there was significant difference between group A and group C (p0.05), B group was higher than that in group C (p0.05). The rate of blastocyst of group A (10.61%) was significantly higher than that of group B (5.34%) and group C (3.58%) after in vitro fertilization of mature oocytes of different grades, and the blastocyst rate of group A (10.61%) was significantly higher than that of group B (5.34%) and C (3.58%). There was no significant difference in blastocyst rate between group A and group B (P0.01) between), B group and C group (P0.05). The results showed that cumulus cells had an effect on the development of oocytes in vitro fertilized eggs. (4) the microinjection of intracytoplasmic sperm into porcine oocytes to prepare embryos was carried out and some improvements were made. Six fertilized blastocysts were successfully prepared, which laid a foundation for the preparation of transgenic pigs. Conclusion: cumulus cells can promote the maturation of oocytes in vitro and embryo development. It is better to select the cumulus-oocyte complex with more than three layers of density. Six fertilized oocysts were successfully prepared by single sperm microinjection of porcine embryos.
【學位授予單位】:南京農(nóng)業(yè)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:S828
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