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Development, Vol 120, Issue 11 3289-3299, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
C Gueth-Hallonet, A Santa-Maria, P Verroust and B Maro
Departement de Biologie du Developpement, Institut Jacques Monod, CNRS-Universite Paris VII, France.
During preimplantation development of the mouse embryo, a layer of outer cells differentiates into a perfect epithelium, the trophectoderm. The divergence between the trophectoderm and the inner cell mass takes place from the 8-cell stage to the 64-cell stage and precedes their commitment at the blastocyst stage. In this work, we have investigated the expression of gp330, a 330 x 10(3) M(r) glycoprotein found in clathrin-coated areas of the plasma membrane of some epithelial cells characterized by a high level of endocytic activity. Our results show that gp330 is first synthesized in 16-cell stage embryos and that its appearance is restricted to outer cells until the blastocyst stage. Furthermore, its expression is repressed in inner cells at a post-transcriptional level, probably through the development of extensive cell-cell contacts.
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