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<dc:title xml:lang="fr">Les séquences régulatrices du gène IKZF1 sont-elles la cible de mutations dans les leucémies aiguës lymphoblastiques B ?</dc:title>
<dcterms:alternative xml:lang="en">Are IKZF1 cis-regulatory sequences targets of mutations in human B-acute lymphoblastic leukemia ?</dcterms:alternative>
<dc:subject xml:lang="fr">IKZF1</dc:subject>
<dc:subject xml:lang="fr">Enhancer</dc:subject>
<dc:subject xml:lang="fr">Délétions</dc:subject>
<dc:subject xml:lang="fr">LAL-B</dc:subject>
<dc:subject xml:lang="en">IKZF1</dc:subject>
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<dcterms:abstract xml:lang="fr">Les mutations du gène suppresseur de tumeur IKZF1 dans les leucémies aiguës lymphoblastique (LALB) confèrent un mauvais pronostic. A ce jour, seules les mutations affectant ses régions codantes sont prises en compte dans la stratégie thérapeutique. Mes travaux ont identifié de larges délétions de la région 5’ non codantes d’IKZF1, entraînant une haplo-insuffisance. J’ai également observé une diminution d'expression d’IKZF1 chez des patients n’ayant aucune délétion exonique du gène, suggérant l'existence d’autres mutations touchant des régions clés de la régulation du gène. Cependant, les connaissances sur la régulation de l'expression d’IKZF1 dans les LAL-B humaines sont limitées. J’ai pu identifier certaines régions cis-régulatrices,notamment introniques, essentielles pour l’expression d’IKZF1. Bien qu’aucune délétion de ces régions n'ait été retrouvée chez les patients, ces découvertes ouvrent des perspectives pour comprendre les mécanismes et risques de ces anomalies dans les LAL-B.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Alterations in the tumor suppressor gene IKZF1 in B-cell acute lymphoblastic leukemia (B-ALL) are associated with a poor prognosis. Currently, only mutations affecting its coding regions are considered in therapeutic strategies. My work has identified large deletions in the non-coding 5' region of IKZF1, resulting in haploinsufficiency. Additionally, I observed a decrease in IKZF1 expression in patients without any exon deletions, suggesting the existence of other mutations affecting key regulatory regions of the gene. However, knowledge about the regulation of IKZF1 expression in human B-ALL is limited. I have identified a number of cis-regulatory elements, in particular in the intronic region, that showed to be essential for IKZF1 expression. Although no deletions in these regions were found in patients, these discoveries provide new insights into the mechanisms and associated risks of these abnormalities in B-ALL.</dcterms:abstract>
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