The Mi-2 nucleosome remodeler and the Rpd3 histone deacetylase are involved in piRNA-guided heterochromatin formation

Bruno Mugat, Simon Nicot, Carolina Varela-Chavez, Christophe Jourdan, Kaoru Sato, Eugenia Basyuk, François Juge, Mikiko C. Siomi, Alain Pélisson and Séverine Chambeyron ()
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Bruno Mugat: CNRS and Univ. Montpellier
Simon Nicot: CNRS and Univ. Montpellier
Carolina Varela-Chavez: CNRS and Univ. Montpellier
Christophe Jourdan: CNRS and Univ. Montpellier
Kaoru Sato: Graduate School of Science, The University of Tokyo
Eugenia Basyuk: CNRS and Univ. Montpellier
François Juge: University of Montpellier, CNRS
Mikiko C. Siomi: Graduate School of Science, The University of Tokyo
Alain Pélisson: CNRS and Univ. Montpellier
Séverine Chambeyron: CNRS and Univ. Montpellier

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract In eukaryotes, trimethylation of lysine 9 on histone H3 (H3K9) is associated with transcriptional silencing of transposable elements (TEs). In drosophila ovaries, this heterochromatic repressive mark is thought to be deposited by SetDB1 on TE genomic loci after the initial recognition of nascent transcripts by PIWI-interacting RNAs (piRNAs) loaded on the Piwi protein. Here, we show that the nucleosome remodeler Mi-2, in complex with its partner MEP-1, forms a subunit that is transiently associated, in a MEP-1 C-terminus-dependent manner, with known Piwi interactors, including a recently reported SUMO ligase, Su(var)2-10. Together with the histone deacetylase Rpd3, this module is involved in the piRNA-dependent TE silencing, correlated with H3K9 deacetylation and trimethylation. Therefore, drosophila piRNA-mediated transcriptional silencing involves three epigenetic effectors, a remodeler, Mi-2, an eraser, Rpd3 and a writer, SetDB1, in addition to the Su(var)2-10 SUMO ligase.

Date: 2020
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DOI: 10.1038/s41467-020-16635-5

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