Human Reproduction, Vol. 10, No. 2, pp. 384-391, 1995
© 1995 European Society of Human Reproduction and Embryology
research-article |
Fertilization and early embryolgoy: Lineage tracing demonstrates that blastomeres of early cleavage-stage human pre-embryos contribute to both trophectoderm and inner cell mass
1Division of Reproductive Endocrinology, Department of Obstetrics and Gynecology Washington, DC 20037 2Department of Anatomy, The George Washington University School of Medicine and Health Sciences, Washington, DC 20037 3Department of Anatomy and Cell Biology, Uniformed Services University of the Health Sciences Bethesda, MD 20895, USA
We injected a fluorescent lineage tracer (Texas Red-lysinedextran) into individual blastomeres of donated human diploid 2- to 8-cell pre-embryos and cultured them to blastocysts. Once pre-embryos reached the expanded blastocyst stage, they were fixed and examined in a scanning confocal microscope to identify the location of fluorescent tracer. In successfully injected pre-embryos that developed to expanded blastocysts, we found that randomly injected blastomeres formed both trophectoderm (TE) and inner cell mass (ICM). More labelled progeny were found in TE than in ICM. Our results show that individual early blastomeres are not yet committed to form either TE or ICM but instead can form both rudiments.
Key words: human pre-embryos/inner cell mass/lineage tracing/trophectoderm
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