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Noncanonical Wnt signaling pathways in C. elegans converge on POP-1/TCF and control cell polarity
1Program in Molecular, Cellular and Developmental Biology, Division of Biology, Kansas State University, Manhattan, KS 66506, USA. mherman@ksu.edu
Abstract:
In the nematode Caenorhabditis elegans, a canonical Wnt signaling pathway controls a cell migration whereas noncanonical Wnt pathways control the polarities of individual cells. Despite the differences in the identities and interactions among canonical and noncanonical Wnt pathway components, as well as the processes they regulate, almost all C. elegans Wnt pathways involve the sole Tcf homolog, POP-1. Intriguingly, POP-1 is asymmetrically distributed between the daughters of an asymmetric cell division, with the anterior sister cell usually having a higher level of nuclear POP-1 than its posterior sister. At some divisions, asymmetric distribution of POP-1 is controlled by noncanonical Wnt signaling, but at others the asymmetry is generated independently. Recent experiments suggest that despite this elaborate anterior-posterior POP-1 asymmetry, the quantity of POP-1 protein may have less to do with the subsequent determination of fate than does the quality of the POP-1 protein in the cell. In this review, we will embark on a quest to understand Quality (1), at least from the standpoint of the effect POP/Tcf quality has on the control of cell polarity in C. elegans.
Insights
In C. elegans, the Tcf homolog POP-1
Area of Science:
- Developmental Biology
- Cell Biology
- Genetics
Background:
- Wnt signaling pathways regulate cell migration and cell polarity in C. elegans.
- The Tcf homolog POP-1 is a key component in both canonical and noncanonical Wnt pathways.
- POP-1 exhibits asymmetric distribution during cell division, with higher levels typically in the anterior daughter cell.
Purpose of the Study:
- To explore the role of "quality" of POP-1 protein in controlling cell polarity.
- To understand how POP-1 protein quality, rather than quantity, influences cell fate determination.
Main Methods:
- Review of existing experimental data on Wnt signaling and POP-1 function in C. elegans.
- Analysis of studies investigating asymmetric cell division and protein distribution.
- Focus on the impact of noncanonical Wnt signaling on POP-1 asymmetry.
Main Results:
- Asymmetric distribution of POP-1 is crucial for anterior-posterior cell fate.
- Noncanonical Wnt signaling can regulate POP-1 asymmetry, but not in all cases.
- Emerging evidence suggests POP-1 protein "quality" is more critical than "quantity" for cell fate.
Conclusions:
- The "quality" of POP-1 protein, not just its level, plays a significant role in cell polarity.
- Further research is needed to elucidate the mechanisms by which POP-1 quality impacts cell fate.
- Understanding POP-1 quality offers new insights into Wnt pathway regulation of development.
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