In-vitro Developmental Potential of Single Blastomeres Derived from Day 3 Discarded Human Embryos
In-vitro Developmental Potential of Single Blastomeres Derived from Day 3 Discarded Human Embryos作者机构：Reproductive Medical Center Ruijin Hospital Shanghai Jiao Tong University of Medicine Shanghai 200025 China
出 版 物：《Journal of Reproduction and Contraception》 (生殖与避孕（英文版）)
年 卷 期：2010年第21卷第1期
页 面：1-8页
学科分类：0710[理学-生物学] 1001[医学-基础医学(可授医学、理学学位)] 07[理学] 08[工学] 0905[农学-畜牧学] 09[农学] 071007[理学-遗传学] 0836[工学-生物工程] 090501[农学-动物遗传育种与繁殖]
基 金：supported by Grants (20060102A1022) from State 863 projects Key projects of Science and Technology Commission of Shanghai (09ZR1419000)
主 题：discarded embryo single blastomere in-vitro development
摘 要：Objective To investigate whether isolated blastomeres of discarded human embryos could develop into blastocysts cultured in vitro without zona pellucida. Methods Total discarded 60 embryos, which were not suitable for transplanting or freezing, were collected from 21 patients. Of 60 embryos, 10, 8, 24, 12, and 4 embryos were at 2-, 3-, 4-, 5- and 6-cell stage, respectively. These embryos were split by 0.5% protease combined with mechanical method. The resulting single blastomere was cultured individually, evaluated daily and counted blastocyst development. Pluripotency of inner cell mass （ICM） of the blastocyst was analyzed by the expression of alkaline phosphatase（AKP）. Results A total of 229 single blastomeres were isolated from 60 embryos. Defining the day when the embryos were split as the first day （d 1）. The majority of the blastomere- derived embryos followed the normal pattern of development with compaction on d 3 and cavitationon d 4 and developed into small blastocysts on d 5. Rates of division, compaction, cavity and expansion of single blastomeres from 4-cell embryos were higher than those in other groups （P 〈O.05）, and AKP was expressed in ICM. Conclusion Some of the blastomeres from discarded human embryo are flexible and able to develop into blastocysts, the potential was related to their donor embryos closely. They seem to follow development pattern of their donor embryos. The blastomere- derived blastocysts have smaller size and fewer cells compared with regular in vitro cultured human embryos. However, AKP expression showed ICM cells with pluripotency. We believe that the value of single blastomere of discarded embryos will be further confirmed in the future.
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