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Connexin43 gap junction protein plays an essential role in morphogenesis of the embryonic chick face

I M McGonnell1, C R Green, C Tickle

  • 1Department of Anatomy and Developmental Biology, University College London, London, United Kingdom. imelda.mcgonnell@kcl.ac.uk

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|December 18, 2001
PubMed

Insights

Connexin43 gap junction proteins are crucial for normal facial development in chick embryos. Reduced connexin43 levels stunt facial primordia outgrowth, leading to developmental defects.

Area of Science:

  • Developmental biology
  • Cellular biology
  • Molecular biology

Background:

  • Facial development in vertebrates requires complex tissue interactions and signaling pathways.
  • Gap junction channels, formed by connexin proteins, mediate intercellular communication and are vital for embryonic development.

Purpose of the Study:

  • To investigate the distribution and function of connexin43 and connexin32 gap junction proteins in chick facial development.
  • To determine the role of connexin43 in facial primordia outgrowth and morphogenesis.

Main Methods:

  • Examined the expression patterns of connexin43 and connexin32 in developing chick faces.
  • Utilized antisense oligodeoxynucleotides to specifically reduce connexin43 protein levels in facial primordia.
  • Analyzed the effects of connexin43 reduction on cell proliferation and Msx-1 expression.
  • Investigated the impact of retinoic acid exposure on connexin protein levels during facial development.

Main Results:

  • Connexin43 and connexin32 proteins were localized in developing chick facial primordia.
  • Downregulation of connexin43 using antisense oligodeoxynucleotides resulted in stunted primordia outgrowth and facial defects.
  • Reduced cell proliferation and lower Msx-1 expression were observed in regions with decreased connexin43.
  • Retinoic acid-induced facial defects were associated with a significant reduction in connexin43, but not connexin32.

Conclusions:

  • Connexin43 plays an essential role in the early morphogenesis and outgrowth of the developing chick face.
  • Intercellular communication mediated by connexin43 is critical for normal facial development.
  • Disruption of connexin43 function can lead to congenital facial abnormalities.

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