Formation of germline chimeras from murine embryonic stem cell lines

种系嵌合体的获得是实现ＥＳ细胞介导的转基因途径的决定步骤。ＥＳ细胞种系分化能力的保持是决定种系嵌合的前提条件，而嵌合体的制作及种系嵌合体的获得则是判定ＥＳ细胞系是否具有种系分化能力的唯一方法。为考察本室新近建立的３种小鼠ＥＳ细胞系ＭＥＳＰＵ２１、ＭＥＳＰＵ２２和ＭＥＳＰＵ２９的种系分化能力，选用近交系Ｃ５７ＢＬ／６Ｊ及远交系ＫＭＷ和ＩＣＲ为受体胚胎提供者，分别通过囊胚注射法和８细胞期桑椹胚注射法进行了嵌合体构建实验。共获得嵌合体８１只，经毛色分析确定在进行测交的４２只嵌合体中有１９只是种系传递者，为国内小鼠ＥＳ细胞种系嵌合体的首例报道。在所考察的３种ＥＳ细胞系中，ＭＥＳＰＵ２ｌ和ＭＥＳＰＵ２２...Generation of germline chimeras is the crucial step in ES cell-mediated transgenesis. The prerequisite for germline chimerism is the maintenance of germline differentiating potency of ES cells, whereas production of germline chimeras is the only method to prove whether such potency is maintained. In order to investigate the germline differentiating potency of three newly established ES cell lines (MESPU21, MESPU22 and MESPU29), ES cells were introduced into host embryos from inbred C57BL/6J and outbred KMW or ICR through blastocyst injection or 8-cell stage morula injection. Totally 81 chimeras were obtained; among 42 test-bred ones, 19 were germline transmitters assessed by coat analysis, as is the first report of ES cell-embryo germline chimeras in China. MESPU21 and MESPU22 formed germline chimeras in high frequency and most of those chimeras produced ES cell-derived progeny in high proportion, which proved that both ES cell lines retained good germline differentiating potency and could be used as valuable cellular vehicles to introduce genetic modifications into mouse genome.PubMed中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)002126-1332