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<dc:title xml:lang="en">Regulation of the diacylglycerol kinase kappa (DGKk) by FMRP and its dysregulation in Fragile X Syndrome</dc:title>
<dcterms:alternative xml:lang="fr">Régulation de la diacylglycérol kinase kappa (DGKk) par FMRP et sa dérégulation dans le syndrome de l’X Fragile</dcterms:alternative>
<dc:subject xml:lang="fr">FXS</dc:subject>
<dc:subject xml:lang="fr">FMRP</dc:subject>
<dc:subject xml:lang="fr">DGKκ</dc:subject>
<dc:subject xml:lang="fr">Signalisation</dc:subject>
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<dc:subject xml:lang="fr">Contrôle traductionnel</dc:subject>
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<dc:subject xml:lang="en">FXS</dc:subject>
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<dc:subject xml:lang="en">DGKκ</dc:subject>
<dc:subject xml:lang="en">Signaling</dc:subject>
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<dcterms:abstract xml:lang="fr">Le syndrome de l'X fragile (FXS) est la principale cause familiale de déficience intellectuelle et d'autisme. Le FXS résulte de la perte d’expression de la protéine de liaison aux ARN, FMRP. L’équipe a précédemment découvert que l'ARNm de la diacylglycérol kinase kappa (DGKκ) est une cible principale de FMRP. DGKκ est une enzyme régulatrice de la signalisation lipidique dont la perte d’expression dans le FXS pourrait expliquer les phénotypes observés. Nous avons démontré que la réexpression de DGKκ dans le cerveau de souris Fmr1-KO à l'aide d’un vecteur viral adéno-associé corrige à long terme les principaux phénotypes du FXS. Par ailleurs, nous avons identifié le site de liaison de FMRP sur l'ARNm de DGKκ et déterminé la contribution des modifications m6A dans la liaison de FMRP et le contrôle traductionnel de DGKκ. De plus, nous avons mis en évidence les fonctions neurologiques de DGKκ grâce à la caractérisation du modèle murin Dgkk-KO qui reproduit des phénotypes de type FXS. Ainsi, cette étude démontre le rôle crucial de DGKκ dans le cerveau et sa contribution dans FXS, et permet de proposer un nouveau modèle par lequel FMRP contrôle l'expression d’une cible d'ARNm.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Fragile X syndrome (FXS) is the main cause of inherited intellectual disability and autism. FXS results from the lack of FMRP that leads to aberrant neuronal protein synthesis associated with neurological alterations. The team found that diacylglycerol kinase kappa (DGKκ) is a primary mRNA target of FMRP in cortical neurons. DGKκ is an enzyme regulating lipid signaling whose downregulation upon loss of FMRP could account for several main alterations observed in FXS. We demonstrated that the reexpression of DGKκ into the brains of Fmr1-KO mice using adeno-associated viral vectors provides long-term correction of the core FXS phenotypes. We identified the binding site of FMRP on DGKκ mRNA and underscored the contribution of m6A RNA modifications in FMRP binding to DGKκ mRNA and its translational control. Additionally, we evidenced the contribution of DGKκ to neurological functions by the characterization of the Dgkk-KO mouse model that recapitulates hallmarks of FXS phenotypes. Overall, this study demonstrates the pivotal role of DGKκ in brain functions and its contributions to FXS, and proposes a novel model by which FMRP controls the expression of an mRNA target.</dcterms:abstract>
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