Complex network of Wnt signaling regulates neuronal migrations during Caenorhabditis elegans development
Anna Y Zinovyeva1, Yuko Yamamoto, Hitoshi Sawa
1Department of Biology, Indiana University, Bloomington, Indiana 47405, USA.
Abstract:
Members of the Wnt family of secreted glycoproteins regulate many developmental processes, including cell migration. We and others have previously shown that the Wnts egl-20, cwn-1, and cwn-2 are required for cell migration and axon guidance. However, the roles in cell migration of all of the Caenorhabditis elegans Wnt genes and their candidate receptors have not been explored fully. We have extended our analysis to include all C. elegans Wnts and six candidate Wnt receptors: four Frizzleds, the sole Ryk family receptor LIN-18, and the Ror receptor tyrosine kinase CAM-1. We show that three of the Wnts, CWN-1, CWN-2, and EGL-20, play major roles in directing cell migrations and that all five Wnts direct specific cell migrations either by acting redundantly or by antagonizing each other's function. We report that all four Frizzleds function to direct Q-descendant cell migrations, but only a subset of the putative Wnt receptors function in directing migrations of other cells. Finally, we find striking differences between the phenotypes of the Wnt quintuple and Frizzled quadruple mutants.
Insights
This study explores Wnt gene and receptor roles in Caenorhabditis elegans cell migration. All five Wnts direct specific cell migrations, with Frizzled receptors crucial for Q-descendant cell movement.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Wnt proteins are secreted glycoproteins essential for numerous developmental processes, including cell migration and axon guidance.
- Previous research identified specific Wnt genes (egl-20, cwn-1, cwn-2) involved in Caenorhabditis elegans cell migration, but a comprehensive analysis was lacking.
Purpose of the Study:
- To investigate the roles of all Caenorhabditis elegans Wnt genes and their candidate receptors in cell migration.
- To elucidate the specific functions and interactions of Wnt ligands and their receptors (Frizzleds, LIN-18, CAM-1) in directing cell movements.
Main Methods:
- Systematic analysis of all Wnt genes and six candidate Wnt receptors in Caenorhabditis elegans.
- Phenotypic analysis of Wnt quintuple and Frizzled quadruple mutants to assess roles in cell migration.
Main Results:
- Three Wnts (CWN-1, CWN-2, EGL-20) are shown to play major roles in directing cell migrations.
- All five Wnts regulate specific cell migrations through redundant or antagonistic interactions.
- All four Frizzled receptors are involved in Q-descendant cell migration, while other receptors have more specific roles.
Conclusions:
- Wnt signaling pathways are complex, involving multiple Wnts and receptors with diverse functions in cell migration.
- Distinct Wnt-Frizzled interactions mediate specific cell migration events, highlighting the intricate regulation of developmental processes.
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