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<dc:title xml:lang="fr">Interplay between the translesion DNA polymerase η and the calpain system</dc:title>
<dcterms:alternative xml:lang="en">Mise en évidence d’un lien entre l’ADN polymérase translésionnelle pol η et le système calpaïne</dcterms:alternative>
<dc:subject xml:lang="fr">Synthèse translésionnelle</dc:subject>
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<dc:subject xml:lang="fr">Calpaïne</dc:subject>
<dc:subject xml:lang="en">Translesion synthesis</dc:subject>
<dc:subject xml:lang="en">DNA polymerase η</dc:subject>
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<tef:elementdEntree autoriteExterne="029771943" autoriteSource="Sudoc">ADN -- Altération</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="053493605" autoriteSource="Sudoc">Calpaïnes</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’ADN est constamment altéré du fait du métabolisme oxydatif de la cellule ou de l’exposition à des agents génotoxiques. Malgré l’existence de systèmes de réparation efficaces, certaines lésions présentes lors de la phase S bloquent la progression des fourches de réplication. La synthèse translésionnelle (TLS) permet la reprise de la réplication. Pol η est une ADN polymérase TLS capable de franchir et sans erreur les lésions induites par les UV mais pol η est mutagène lorsqu’elle réplique l'ADN non endommagé. Par conséquent, son activité doit être strictement régulée. La thèse présente l’étude de l’interaction entre pol η et CAPNS1, la sous-unité des calpaïnes 1 et 2. Ces protéases ubiquitaires dépendantes du calcium régulent de nombreux processus cellulaires. Nous montrons que CAPNS1 est colocalisée avec pol η dans le noyau. La calpaïne clive pol η in vitro et in vivo après l’acide aminé 465, laissant le domaine catalytique intact et le motif PIP1. De manière surprenante, l'inhibition de la calpaïne entraîne une diminution de la formation de foyers pol η et de la survie cellulaire. Ces résultats suggèrent que la calpaïne est impliquée dans la TLS dépendante de pol η.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Cells are constantly exposed to DNA damaging agents causing lesions, which are repaired by a range of DNA repair pathways. If DNA damages prevail during replication, they can cause replication fork breakdowns and mutations. One mechanism to prevent this is the translesion synthesis (TLS). Pol η is a translesion DNA polymerase which is capable to circumvent UV-induced lesions, to be repaired at a later time. However, pol η is error prone on non-damaged DNA and, therefore, needs to be tightly regulated. This thesis present an interaction between pol η and CAPNS1 and our investigation of its role in regulating pol η. CAPNS1 is the small subunit of the calcium dependent calpain 1 and 2. We demonstrate that CAPNS1 is colocalized with pol η in the nucleus and calpain 1/2 can cleave pol η in vitro and in vivo. The proteolysis of pol η is found to occur at position 465 leading to a truncated protein encompassing the catalytic domain and the PIP1 motif. Interestingly, inhibition of calpain leads to a perturbed pol η foci formation and decreased cell survival. Taken together, these results suggest an important positive role for calpain in pol η dependent TLS.</dcterms:abstract>
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