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<dc:title xml:lang="en">Towards a role of PARP3 in the transcriptional regulation of genes involved in tumour progression</dc:title>
<dcterms:alternative xml:lang="fr">Vers un rôle de PARP3 dans la régulation transcriptionnelle de gènes impliqués dans la progression tumorale</dcterms:alternative>
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<dc:subject xml:lang="fr">Agressivité tumorale</dc:subject>
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<dc:subject xml:lang="en">PARP</dc:subject>
<dc:subject xml:lang="en">Tumour aggressiveness</dc:subject>
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<dcterms:abstract xml:lang="fr">Dans cette thèse, nous avons exploré un rôle de la poly(ADP-ribose) polymérase 3 (PARP3) dans les propriétés tumorales d’une lignée cellulaire de cancer de la prostate, PC-3. L’absence de PARP3 (Crispr/Cas9) induit une augmentation de la migration et de l’expression de marqueurs EMT ainsi qu’une insensibilité aux agents clastogènes : des marqueurs de l’agressivité tumorale. En revanche, nous identifions une diminution des propriétés souches. Une analyse RNA-Seq révèle une augmentation de l’expression de gènes impliqués dans la migration et une diminution de gènes impliqués dans l’adhésion et codant pour des facteurs de transcription à doigt de zinc de type C2H2. Par ChIP-Seq, nous montrons que plus de 50% des gènes dérégulés montrent une perte d’enrichissement de structures quadruplex (G4). Nous détectons aussi une perte d’enrichissement des protéines de réparation : APE1 et OGG1 (ChIP-qPCR). Enfin, des expériences de digestion à la MNase suggèrent une relaxation de la chromatine quoique modérée. Ce travail identifie un rôle de PARP3 dans la régulation de la plasticité cellulaire en partie en modulant la dynamique des structures G4 pour une transcription sélective de gènes.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In this thesis, we explored a role for poly(ADP-ribose) polymerase 3 (PARP3) in the tumour properties of a prostate cancer cell line, PC-3. The absence of PARP3 (Crispr/Cas9) induces increased migration and expression of EMT markers as well as insensitivity to clastogenic agents: markers of tumour aggressiveness. In contrast, we identify a decrease in stemness properties. RNA-Seq analysis reveals an increase in the expression of genes involved in migration and a decrease in genes involved in adhesion and coding for C2H2 zinc finger transcription factors. By ChIP-Seq, we show that more than 50% of the deregulated genes show a loss of enrichment of quadruplex structures (G4). We also detect a loss of enrichment of repair proteins : APE1 and OGG1 (ChIP-qPCR). Finally, MNase digestion experiments suggest a moderate relaxation of chromatin. This work identifies a role for PARP3 in the regulation of cell plasticity in part by modulating the dynamics of G4 structures for selective gene transcription.</dcterms:abstract>
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