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Journal of Cell Science, Vol 109, Issue 1 191-197, Copyright © 1996 by Company of Biologists

JOURNAL ARTICLES

Expression of the gap junction proteins connexin31 and connexin43 correlates with communication compartments in extraembryonic tissues and in the gastrulating mouse embryo, respectively

E Dahl, E Winterhager, B Reuss, O Traub, A Butterweck and K Willecke
Abt. Molekulargenetik, Universitat Bonn, Germany.

We have characterized the pattern of connexin expression in embryonic and extraembryonic tissues during early mouse development. In the preimplantation blastocyst, at 3.5 days post coitum (dpc), immunofluorescent signals specific for connexin31 and connexin43 proteins were present in both the inner cell mass and the trophectoderm, as shown by confocal laser scan microscopy. Immediately after implantation at 6.5 dpc, however, we find complete compartmentation of these two connexins: connexin31 mRNA and protein are expressed exclusively in cells derived from the trophectoderm lineage, whereas connexin43 mRNA and protein are detected in cells derived from the inner cell mass. This expression pattern of connexin31 and connexin43 is maintained at 7.5 dpc when the axial polarity of the mouse embryo is established. It correlates with the communication compartments in extraembryonic tissues and the gastrulating mouse embryo, respectively. The communication boundary between those compartments may be due to incompatibility of connexin31 and connexin43 hemichannels, which do not communicate with each other in cell culture.


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© The Company of Biologists Ltd 1996