Projektbeschreibung
Neues über die Eliminierung von Zentriolen während der Oogenese
Zentriolen sind Zellorganellen, welche die Bildung von Fortbewegungsstrukturen wie Zilien und Flagellen sowie der Zentrosomen unterstützen. Während der geschlechtlichen Fortpflanzung trägt nur das Sperma Zentriolen zur Zygote bei, während aus der Eizelle die Zentriolen eliminiert werden. Der diesen Aspekt zugrunde liegende Mechanismus ist immer noch ungeklärt. Das EU-finanzierte Projekt CENTEL wird mithilfe des Fadenwurms Caenorhabditis elegans den Mechanismus erkunden, durch den die Zentriolen während der Oogenese eliminiert werden. Das Forschungsteam wird Echtzeit-Bildgebung einsetzen und ein Proteom-Screening durchführen, um die Hauptbeteiligten dieses Prozesses zu finden. Eines der Hauptziele ist es, herauszufinden, in welchem Maße die Eliminierung der Zentriolen evolutionär konserviert ist.
Ziel
Centrioles are evolutionary conserved organelles that template the formation of cilia, flagella and centrosomes. Centriole number dictates how many such structures form in a cell, so that controlling this number is essential for proper development and health. During sexual reproduction of animals, only the sperm contributes centrioles to the zygote, whereas centrioles are eliminated from the oocyte. The signals initiating and the processes executing centriole elimination remain largely elusive, both during oogenesis and in other developmental contexts where this can occur. Here, I propose to conduct state-of-the art live imaging and use novel quantitative super-resolution approaches in C. elegans to uncover the timing and molecular changes during oogenesis centriole elimination. Moreover, I will decipher the role of the RNA-binding protein CGH-1 in the timing of centriole elimination through a sequencing-based approach. Furthermore, I will conduct a proteomic screen to identify and characterize novel components required for oogenesis centriole elimination in worms. In a complementary approach, I will address the potential evolutionary conservation of centriole elimination mechanisms using the protist N. gruberi, which diverged from C. elegans over a billion years ago. I propose to also analyze in detail the dynamics of the elimination process in this system using deployed molecular markers. Moreover, I will conduct a proteomic screen to identify candidate centriolar proteins directing centriole elimination in N. gruberi. Furthermore, I will develop RNAi-mediated and CRISPR/Cas9 inactivation methods to test the function of candidate proteins in centriole elimination, thus also adding an important item to the toolbox at the disposal of scientists using N. gruberi. Overall, my work is expected to reveal whether centriole elimination is an ancestral mechanisms that has been conserved across eukaryotes and uncover the underlying molecular tenets of this process.
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MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Koordinator
1015 Lausanne
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