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Caractérisation de TgZFP2, une nouvelle protéine à motif en doigt de zinc impliquée dans la coordination de la progression du cycle cellulaire du parasite apicomplexe Toxoplasma gondii

Abstract : The phylum Apicomplexa encompasses parasitic protists with a complex life cycle that alternates between sexual and asexual replication in different hosts. Apicomplexa are obligate intracellular parasites that display a peculiar organisation of their cell cycle. It consists of a nuclear phase (DNA replication) and a budding phase (daughter cells assembly) that can be uncoupled or coordinated differently, resulting in four distinctive modes of division in the phylum. The simplest of them, endodyogeny, is characteristic for the rapidly proliferating tachyzoite asexual stage of Toxoplasma gondii and comprises a single round of DNA replication and subsequent formation of two daughter cells within the mother cell. The regulatory system of endodyogeny is suggested to be physically linked to the parasite’s unusual bipartite centrosome, but remains largely unexplored. During this research project I characterized a novel T. gondii zinc finger protein named TgZFP2, whose knockdown led to a striking arrest of the parasite cell cycle. While DNA replication proceeded as normally, the budding was affected, resulting in appearance of immature daughters that failed to emerge from the mother cell and often failed to incorporate nuclear material. We have shown that, at the onset of daughter cells assembly, TgZFP2 re-localises from cytoplasmic puncta to the peri-centrosomal region where it persists until the completion of division. TgZFP2 also behaves as a cytoskeleton-associated protein. Though we were unable to identify TgZFP2 molecular partners to decipher the precise molecular mechanisms it is involved in, our data show TgZFP2 is an important regulator of the cell cycle that may have a pleotropic function.
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Ksenia Semenovskaya. Caractérisation de TgZFP2, une nouvelle protéine à motif en doigt de zinc impliquée dans la coordination de la progression du cycle cellulaire du parasite apicomplexe Toxoplasma gondii. Agricultural sciences. Université Montpellier, 2019. English. ⟨NNT : 2019MONTT063⟩. ⟨tel-02650632⟩

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