PuSH - Publication Server of Helmholtz Zentrum München: Chromatin signatures and retrotransposon profiling in mouse embryos reveal regulation of LINE-1 by RNA.

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Fadloun, A.* ; Le Gras, S.* ; Jost, B.* ; Ziegler-Birling, C.* ; Takahashi, H.* ; Gorab, E.* ; Carninci, P.* ; Torres-Padilla, M.E.*

Chromatin signatures and retrotransposon profiling in mouse embryos reveal regulation of LINE-1 by RNA.

Nat. Struct. Mol. Biol. 20, 332-338 (2013)

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How a more plastic chromatin state is maintained and reversed during development is unknown. Heterochromatin-mediated silencing of repetitive elements occurs in differentiated cells. Here, we used repetitive elements, including retrotransposons, as model loci to address how and when heterochromatin forms during development. RNA sequencing throughout early mouse embryogenesis revealed that repetitive-element expression is dynamic and stage specific, with most repetitive elements becoming repressed before implantation. We show that LINE-1 and IAP retrotransposons become reactivated from both parental genomes after fertilization. Chromatin immunoprecipitation for H3K4me3 and H3K9me3 in 2- and 8-cell embryos indicates that their developmental silencing follows loss of activating marks rather than acquisition of conventional heterochromatic marks. Furthermore, short LINE-1 RNAs regulate LINE-1 transcription in vivo. Our data indicate that reprogramming after mammalian fertilization comprises a robust transcriptional activation of retrotransposons and that repetitive elements are initially regulated through RNA.

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