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<dc:title xml:lang="fr">Étude de la génétique du complément dans la néphropathie à dépôts mésangiaux d’IgA et son impact en clinique</dc:title>
<dcterms:alternative xml:lang="en">The role of complement genetics in IgA nephropathy and its clinical consequences</dcterms:alternative>
<dc:subject xml:lang="fr">Néphropathie à IgA</dc:subject>
<dc:subject xml:lang="fr">Complément</dc:subject>
<dc:subject xml:lang="fr">Génétique</dc:subject>
<dc:subject xml:lang="fr">Haplotypes</dc:subject>
<dc:subject xml:lang="fr">Facteur H</dc:subject>
<dc:subject xml:lang="fr">MCP</dc:subject>
<dc:subject xml:lang="en">IgA nephropathy</dc:subject>
<dc:subject xml:lang="en">Complement</dc:subject>
<dc:subject xml:lang="en">Genetics</dc:subject>
<dc:subject xml:lang="en">Haplotypes</dc:subject>
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<dcterms:abstract xml:lang="fr">Le complément est activé dans la néphropathie à IgA (IgAN). Nous avons étudié les marqueurs plasmatiques d'activation du complément de 87 patients par ELISA multiplex et les dépôts endothéliaux induits ex vivo par le sérum de 41 patients. L’impact clinique de la génétique du complément a été explorée dans une cohorte de 260 patients. Malgré l'absence de consommation plasmatique du C3 et du C4, 48/87 patients IgAN transplantés rénaux ont une activation modérée du complément (C3a, Bb, sC5b-9 élevés) et 19/41 patients induisent des dépôts endothéliaux de complément. L'analyse génétique a révélé une prévalence plus élevée de variants rares du CFH chez les patients IgAN (4,6 % vs. 1,8 %, p=0,034), dont 4 altérant l'activité régulatrice du FH in vitro. L'haplotype H2 du CFH est protecteur vis-à-vis du risque de développer une IgAN et l'haplotype MCP ggaac est un facteur de risque d’insuffisance rénale terminale. Nos résultats appuient le rôle du complément dans la progression de l'IgAN.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The complement is activated in IgA nephropathy (IgAN). We conducted a comprehensive investigation of plasma complement activation biomarkers (n=87) using multiplex ELISA and a novel model measuring serum-induced complement deposition on endothelial cells by sera from patients (n=41). We also examined the impact of complement genetics on IgAN susceptibility and renal outcomes in 260 patients. Despite no C3 and C4 plasma consumption, 48/87 kidney transplant IgAN patients showed mild complement activation (elevated C3a, Bb, sC5b-9) and 19/41 patients induced endothelial complement deposition. Genetic analysis revealed a higher prevalence of rare CFH missense variants in IgAN patients (4.6% vs. 1.8% controls, p=0.034), with 4 variants impairing FH regulatory activity in vitro. The complement CFH-H2 haplotype protected against IgAN susceptibility, whereas the MCP ggaac haplotype increased the risk of end-stage-renal disease. Our findings highlight the role of complement in IgAN progression.</dcterms:abstract>
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