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tcl-2 encodes a novel protein that acts synergistically with Wnt signaling pathways in C. elegans
Xiaojun Zhao1, Hitoshi Sawa, Michael A Herman
1Program in Molecular, Cellular and Developmental Biology, Division of Biology, Kansas State University, Manhattan, KS 66506, USA.
Abstract:
Mutations in tcl-2 cause defects in the specification of the fates of the descendants of the TL and TR blast cells, whose polarity is regulated by lin-44/Wnt and lin-17/frizzled, during Caenorhabditis elegans development. In wild-type animals, POP-1/TCF/LEF, is asymmetrically distributed to the T cell daughters, resulting in a higher level of POP-1 in the nucleus of the anterior daughter. The POP-1 asymmetric distribution is controlled by lin-44 and lin-17. However, in tcl-2 mutants, POP-1 is equally distributed to T cell daughters as is observed in lin-17 mutants, indicating that, like lin-17, tcl-2 functions upstream of pop-1. In addition, tcl-2 mutations cause defects in the development of the gonad and the specification of fate of the posterior daughter of the P12 cell, both of which are controlled by the Wnt pathway. Double mutant analyses indicate that tcl-2 can act synergistically with the Wnt pathway to control gonad development as well as P12 descendant cell fate specification. tcl-2 encodes a novel protein. A functional tcl-2::gfp construct was weakly expressed in the nuclei of the T cell and its descendants. Our results suggest that tcl-2 functions with Wnt pathways to control T cell fate specification, gonad development, and P12 cell fate specification.
Insights
Mutations in tcl-2 disrupt cell fate specification in Caenorhabditis elegans by affecting POP-1 distribution. This gene acts upstream of POP-1 and interacts with Wnt pathways, impacting gonad development and cell fate.
Area of Science:
- Developmental Biology
- Cell Biology
- Genetics
Background:
- Cell polarity and asymmetric division are crucial for development.
- Wnt signaling pathways regulate cell fate and polarity in many organisms.
- The T cell lineage in Caenorhabditis elegans provides a model for studying asymmetric cell division.
Purpose of the Study:
- To investigate the function of the novel gene tcl-2 in Caenorhabditis elegans development.
- To determine the role of tcl-2 in cell fate specification and polarity.
- To elucidate the relationship between tcl-2 and Wnt signaling pathways.
Main Methods:
- Genetic analysis of tcl-2 mutants in Caenorhabditis elegans.
- Analysis of POP-1 protein distribution using fluorescent reporters.
- Double mutant analysis to assess genetic interactions with Wnt pathway components.
- Expression analysis of a tcl-2::gfp fusion construct.
Main Results:
- tcl-2 mutations lead to defects in T cell lineage specification and P12 cell fate.
- tcl-2 is required for the asymmetric distribution of POP-1, functioning upstream of POP-1.
- tcl-2 acts synergistically with Wnt pathways in gonad development and P12 cell fate specification.
- tcl-2::gfp is localized to the nucleus of T cells and their descendants.
Conclusions:
- tcl-2 is a novel gene that plays a critical role in regulating cell polarity and fate specification during Caenorhabditis elegans development.
- tcl-2 functions in conjunction with Wnt signaling pathways to control key developmental processes.
- Understanding tcl-2's function provides insights into the conserved mechanisms of Wnt-mediated development.