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<dcterms:abstract xml:lang="fr">Au cours des réponses immunes, le répertoire des lymphocytes B est diversifié par les mécanismes d’hypermutation somatique (HMS) et de commutation isotypique (CI), qui nécessitent tout deux l’action de l’enzyme Activation Induced cytidine Deaminase (AID) aux loci des immunoglobulines (Ig) afin de générer des mutations et des cassures double brins dans l’ADN. Cependant, si les dommages induits par AID sont mal ciblés et/ou mal réparés, cela peut aboutir à une instabilité génomique à l’origine de lymphomes. Afin de mieux comprendre comment l’activité d’AID est régulée, j'ai utilisé la technologie d'identification de protéines par biotinylation à proximité (BioID). Grâce à celle-ci, j'ai identifié de nouveaux partenaires potentiels d'AID, dont le rôle reste à déterminer. J’ai également contribué à la caractérisation de Fam72a, en montrant que ce facteur est requis pour promouvoir une CI et une HMS efficaces en régulant la quantité d’Ung2 lors de l’activation des lymphocytes B.</dcterms:abstract>
<dcterms:abstract xml:lang="en">During immune responses, the B cell repertoire is diversified by the mechanisms of somatic hypermutation (SHM) and class switch recombination (CSR), both of which require the action of the enzyme Activation Induced cytidine Deaminase (AID) at immunoglobulin (Ig) loci to generate mutations and double-strand breaks in DNA. However, if AID-induced damage is poorly targeted and/or poorly repaired, it can result in genomic instability leading to lymphomas. In order to better understand how AID activity is regulated, I used the proximity dependent biotinylation identification (BioID) technology. With it, I identified new potential partners of AID, whose role remains to be determined. I also contributed to the characterization of Fam72a, showing that this factor is required to promote efficient CSR and SHM by regulating the levels of Ung2 during B cell activation.</dcterms:abstract>
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