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. Epigénétique, Bien que son génome ne montre pas une quantité significative de 5mC, l'inactivation de PaRid chez Podospora anserina aboutit à un blocage du développement sexué survenant après la fécondation. Dans ce contexte, nous avons voulu déterminer si la fonction de PaRid dans le développement sexué consiste à éteindre l'expression de gènes cibles via l'installation de foyers d'hétérochromatine constitutive aux loci concernés. Pour ce faire, nous avons identifié les gènes PaKmt1 et PaHP1, codant respectivement l'histone méthyltransférase PaKmt1 (l'homologue de SU(VAR)39 qui catalyse la tri-méthylation du résidu H3K9 (H3K9me3) et PaHP1 (l'homologue de Heterochromatin Protein 1 qui se lie à H3K9me3). Les deux protéines interviennent dans une même voie de régulation qui aboutit à la mise en place de l'hétérochromatine constitutive. Par opposition, PaKmt6, homologue de l'histone méthyltransférase E(Z), correspond à la sous-unité catalytique du complexe PRC2 qui catalyse la marque H3K27me3 pour permettre l'établissement de l'hétérochromatine facultative. Nos résultats ont montré que l'absence de PaKmt1 et PaHP1 ne provoquent que des défauts mineurs. A l'inverse, l'inactivation du gène PaKmt6 conduit à un ensemble de défauts sévères : croissance végétative altérée, surproduction des gamètes mâles, malformations critiques des fructifications, production très réduite d'ascospores dont la germination est pour partie déficiente. Une étude d'épistasie a montré que les protéines PaRid et PaKmt6 interviennent chacune dans deux voies développementales distinctes. Par ailleurs, nous avons établi par immuno-précipitation de la chromatine les profils de distribution à l'échelle du génome entier des modifications H3K9me3, H3K27me3 et H3K4me3. Caractéristique rare, la marque H3K9me3 colocalise avec H3K27me3 sur des gènes transcriptionnellement réprimés et les séquences répétées ripées. Conformément à sa fonction canonique, H3K4me3 est présente en 5' des gènes transcrits et est exclue des domaines H3K9me3 et H3K27me3. Comme attendue, hétérochromatine facultative, H3K9me3, H3K27me3, H3K4me3, Repeat Induced Point Mutation, développement sexué Pour se défendre des effets délétères des éléments transposables, les pezizomycotina ont développé un système de défense génétique et épigénétique appelé « Repeat Induced Point Mutation » (RIP). Chez N. crassa, le RIP survient dans la cellule dicaryotique avant la caryogamie et conduit à la méthylation de novo des cytosines (5mC) inclues dans les séquences répétées de chacun des noyaux parentaux haploïdes

, Heterochromatin functions and organizations during sexual development in the filamentous fungus Podospora anserina

, To assemble constitutive heterochromatin, PaKmt1 catalyses tri-methylation of H3K9 (H3K9me3), latter on bound by PaHP1. By contrast, the E(Z) histone methyltransferase homologue PaKmt6, as part of the PRC2 complex, catalyses tri-methylation of H3K27 (H3K27me3) to form facultative heterochromatin. Our results showed that loss of either PaKmt1 or PaHP1 does not cause major defects. Conversely, PaKmt6 gene inactivation results in severe defects: altered mycelium and vegetative growth rate, overproduction of male gamete, development of crippled fructifications, reduced production ascospores, part of which does not germinate. Furthermore, epistatic study showed that PaRid and PaKmt6 likely act in two different developmental pathways, with respect to sexual reproduction. In addition, using chromatin immuno-precipitation we characterized H3K9me3, H3K27me3 and H3K4me3 genome-wide distribution patterns. We observed an uncommon overlapping distribution between H3K9me3 and H3K27me3 on transcriptionally repressed genes and RIP target repeats. As expected, Epigenetics, filamentous fungi, constitutive heterochromatin, facultative heterochromatin, H3K9me3, H3K27me3, H3K4me3, Repeat Induced Point Mutation, sexual development In pezizomycotina, transposable elements are targeted by a genome defence system named Repeat Induced Point Mutation (RIP)