Getting to the core of cadherin complex function in Caenorhabditis elegans

Area of Science:

• Cell Biology
• Developmental Biology
• Genetics

Background:

• The classic cadherin-catenin complex (CCC) is crucial for cell-cell adhesion in metazoans.
• Studying CCC in vertebrate tissue culture presents challenges in analyzing its regulation and requirements in vivo.
• Caenorhabditis elegans offers a powerful model system to bridge molecular CCC details with organismal function.

Purpose of the Study:

• To elucidate conserved molecular mechanisms of the cadherin-catenin complex (CCC) using Caenorhabditis elegans.
• To investigate the function of key residues mediating cadherin/β-catenin binding.
• To explore novel roles of p120ctn homologues in early embryonic development and CCC trafficking.

Main Methods:

• Utilizing an "angstroms to embryos" approach to study CCC function.
• Investigating conserved residues critical for cadherin/β-catenin interaction.
• Analyzing the role of the C. elegans p120ctn homologue in blastomere polarization.
• Examining the role of clathrin adaptor protein complex 1 (AP-1) in CCC trafficking.

Main Results:

• Identified key residues conserved across metazoans essential for cadherin/β-catenin binding.
• Revealed a novel role for the C. elegans p120ctn homologue in regulating early embryonic blastomere polarization via Cdc42 and PAR/aPKC.
• Demonstrated surprising mechanisms of CCC trafficking to the cell surface mediated by AP-1.

Conclusions:

• Caenorhabditis elegans is a valuable model for dissecting conserved CCC functions.
• The findings highlight the importance of specific residues for cadherin-catenin binding.
• Novel insights into CCC regulation, including roles in polarity and trafficking, have been uncovered.