Spatiotemporal expression pattern of Connexin 43 during early chick embryogenesis

Area of Science:

• Developmental biology
• Neuroscience
• Cell biology

Background:

• Trigeminal ganglion (cranial nerve V) development involves interactions between neural crest and cranial placode cells.
• Understanding cell-cell communication mechanisms is crucial for comprehending peripheral nervous system assembly.
• Gap junctions, facilitated by proteins like Connexin 43, are potential mediators of this communication.

Purpose of the Study:

• To investigate the role of Connexin 43 in trigeminal ganglion development.
• To map the spatiotemporal expression of Connexin 43 during the formation of the trigeminal ganglion.
• To elucidate the contribution of Connexin 43 to the interaction between neural crest and placode cells.

Main Methods:

• Generated a comprehensive spatiotemporal expression profile for Connexin 43.
• Analyzed Connexin 43 expression during neural fold fusion, epithelial-to-mesenchymal transition (EMT), and neural crest cell migration.
• Examined Connexin 43 localization during trigeminal gangliogenesis.

Main Results:

• Connexin 43 expression was observed in neural folds, premigratory and migratory neural crest cells, and mesenchyme during trigeminal gangliogenesis.
• Connexin 43 was notably absent in placode-derived neurons.
• Expression patterns suggest Connexin 43 is involved in neural crest cell processes like EMT and migration.

Conclusions:

• Connexin 43 is dynamically expressed in neural crest cells throughout trigeminal ganglion development.
• The absence of Connexin 43 in placode-derived neurons highlights distinct cellular contributions.
• Connexin 43 likely plays a significant role in neural crest cell behavior during gangliogenesis and tissue formation.