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The role of phosphatidylinositol-4-phosphate 5-kinase PPK-1 in Wnt signalling regulation in Caenorhabditis elegans
Zavadilová, Kristýna ; Macůrková, Marie (advisor) ; Kostrouch, Zdeněk (referee)
The Wnt signalling pathway is highly conserved signalling among Eukaryotes that regulates many cellular processes. In particular, it plays a role during invidual's development, but it is also important at later stage of life, when it is involved in maintaining homeostasis in the body. Recent studies have shown that phosphatidylinositol-4-phospahte 5-kinase (PIP5K), which is key to the production of phosphatidylinositol (4,5)-bisphosphate in the cell, is also involved in regulation of the canonical Wnt signalling cascade. In mammalian cells, a model has been described in which PIP5K is involved in signal transduction in a Wnt receiving cell. We decided to verify the involvement of PIP5K in the regulation of Wnt signalling also in Caenorhabditis elegans, an excellent model organism for study of signalling pathways, and thus contribute to a better understanding of this evolutionarily conserved pathway. In this work, we found that decreased expression of PPK-1/PIP5K in wild type animals does not result in Wnt signalling disruption. Nevertheless, in conditions, where the activity of Wnt signalling is already reduced, decrease in PPK-1 levels leads to defective migration of the QL neuroblast daughter cell. By analyzing the migration of QL progeny, which is controlled by EGL-20/Wnt dependent Wnt...
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