Protogenin mediates cell adhesion for ingression and re-epithelialization of paraxial mesodermal cells

Area of Science:

• Developmental biology
• Cell adhesion
• Molecular mechanisms of embryogenesis

Background:

• During avian embryonic development, paraxial mesoderm precursor cells ingress through the primitive streak and migrate.
• These cells originate from the epiblast and are essential for forming the somites.
• The molecular cues governing this migration and tissue organization are critical to understand.

Purpose of the Study:

• To investigate the role of Protogenin (PRTG) in paraxial mesoderm development in avian embryos.
• To elucidate the function of PRTG, an immunoglobulin superfamily protein, in cell adhesion and migration during embryogenesis.

Main Methods:

• Utilized L-cell aggregation assays to assess PRTG's cell adhesion properties.
• Employed overexpression and siRNA knockdown techniques to study PRTG's effects on mesodermal cell migration and epiblast ingression.
• Examined the impact of PRTG manipulation on the epithelial structure of somites.

Main Results:

• Protogenin (PRTG) mediates homophilic cell adhesion, as demonstrated by L-cell aggregation assays.
• Overexpression of PRTG led to delayed mesodermal cell migration due to increased cell adhesiveness.
• siRNA knockdown of PRTG resulted in impaired epiblast cell ingression and disorganized somite epithelial structure.

Conclusions:

• Protogenin (PRTG) plays a vital role in regulating continuous cell ingression for paraxial mesoderm lineage formation.
• PRTG-mediated cell adhesion is essential for maintaining tissue integrity during somite development.
• These findings highlight PRTG as a key regulator of cell adhesion dynamics in avian embryogenesis.