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Intercellular communication in preimplantation development: the role of gap junctions
1Departments of Physiology, Obstetrics and Gynaecology, and Paediatrics, The University of Western Ontario, London, Ontario N6A 5C1, Canada. gerald.kidder@med.uwo.ca
Summary
Gap junctions, formed by connexins, facilitate cell communication. While crucial for later development, their exact role in early embryonic development remains unclear despite various studies.
Area of Science:
- Developmental Biology
- Cell Biology
- Molecular Biology
Background:
- Gap junctions mediate intercellular communication via connexin proteins.
- Multiple connexins are expressed in preimplantation embryos, suggesting diverse channel functions.
- The role of gap junctions in early embryonic development is debated.
Purpose of the Study:
- To review the current understanding of gap junction roles in preimplantation development.
- To explore the implications of multiple connexin expression in early embryos.
- To reconcile conflicting evidence regarding gap junction function before implantation.
Main Methods:
- Analysis of gene targeting experiments in mice lacking specific connexins.
- Review of studies using anti-connexin antibodies and pharmacological blockers.
- Examination of connexin expression patterns during mouse embryogenesis.
Main Results:
- Connexin knockouts have not revealed essential roles for single connexins before implantation.
- Gap junctional coupling is critical for early postimplantation development.
- Conflicting data exists from antibody and pharmacological studies.
Conclusions:
- The precise function of individual connexins in preimplantation development is not yet established.
- Gap junctions play a significant role in postimplantation development.
- Multiple connexin expression may prime the conceptus for subsequent developmental events like gastrulation and placentation.