目的：本项目旨在采用体外合成的mRNA转染细胞实现多个生殖细胞特异基因的非整合性过表达，更好地模拟体内生殖细胞发育分化过程，最大限度地诱导山羊骨髓间充质干细胞（BMSCs）分化为早期原始生殖细胞（PGC）并顺利通过减数分裂，形成单倍体的雄性生殖细胞。内容：①基于Bmp-4在PGC形成过程中的重要作用，通过体外合成的Bmp-4 mRNA诱导BMSCs分化为PGC，并通过Vasa-GFP早期生殖细胞的报告模型，利用流式细胞仪分选出PGC样细胞。②基于Stra8，Dazl和Boule对雄性生殖细胞减数分裂的重要调控作用，体外合成这三种基因的mRNA, 尝试通过不同基因组合诱导BMSCs分化来源的PGC启动减数分裂，形成单倍体的精子样细胞，并分别从细胞形态、基因和蛋白表达特征、印记基因甲基化情况、体外支持胚胎发育和体内分化能力等方面对诱导生成的雄性生殖细胞进行鉴定。

Purpose: this study aims to describe a simple, nonintegrating strategy based on administration of synthetic mRNA for efficiently directing the differentiation of goat bone marrow mesenchymal stem cells (BMSCs) into primordial germ cells(PGC), then getting through meiosis, and differentiate into haploid male germ cells..Contents: ①Based on Bmp-4 has an important role in the process of primordial germ cells, BMSCs were induced to differentiate into PGCs by Bmp-4 gene transient expression with synthetic Bmp-4 mRNA, and the PGCs could be sorted out by the system of germ cell-specific expression of Vasa gene promoter driving the expression of green fluorescent protein; ②Based on the regulation roles of the Stra8, Dzal and Boule on male germ cell meiosis, the PGC induced from BMSCs further differentiated into haploid sperm cells by synthetic Stra8, Dzal and Boule mRNA, and the male germ cells induced from the BMSCs were then identified by cell morphology, gene and protein expression, imprinted gene methylation,the ability supporting embryo development in vitro and the differentiation capability in vivo.