Epigenetic silencing of Oct4 by a complex containing SUV39H1 and Oct4 pseudogene lncRNA

Michele Scarola, Elisa Comisso, Rhena Pascolo, Riccardo Chiaradia, Rosa Maria Marion, Claudio Schneider, Maria A. Blasco, Stefan Schoeftner () and Roberta Benetti ()
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Michele Scarola: Cancer Epigenetic Group, Laboratorio Nazionale Consorzio Interuniversitario Biotecnologie (LNCIB)
Elisa Comisso: Cancer Epigenetic Group, Laboratorio Nazionale Consorzio Interuniversitario Biotecnologie (LNCIB)
Rhena Pascolo: Cancer Epigenetic Group, Laboratorio Nazionale Consorzio Interuniversitario Biotecnologie (LNCIB)
Riccardo Chiaradia: Cancer Epigenetic Group, Laboratorio Nazionale Consorzio Interuniversitario Biotecnologie (LNCIB)
Rosa Maria Marion: Telomeres and Telomerase Group, Spanish National Cancer Research Centre (CNIO)
Claudio Schneider: Cancer Epigenetic Group, Laboratorio Nazionale Consorzio Interuniversitario Biotecnologie (LNCIB)
Maria A. Blasco: Telomeres and Telomerase Group, Spanish National Cancer Research Centre (CNIO)
Stefan Schoeftner: Cancer Epigenetic Group, Laboratorio Nazionale Consorzio Interuniversitario Biotecnologie (LNCIB)
Roberta Benetti: Cancer Epigenetic Group, Laboratorio Nazionale Consorzio Interuniversitario Biotecnologie (LNCIB)

Nature Communications, 2015, vol. 6, issue 1, 1-13

Abstract: Abstract Pseudogene-derived, long non-coding RNAs (lncRNAs) act as epigenetic regulators of gene expression. Here we present a panel of new mouse Oct4 pseudogenes and demonstrate that the X-linked Oct4 pseudogene Oct4P4 critically impacts mouse embryonic stem cells (mESCs) self-renewal. Sense Oct4P4 transcription produces a spliced, nuclear-restricted lncRNA that is efficiently upregulated during mESC differentiation. Oct4P4 lncRNA forms a complex with the SUV39H1 HMTase to direct the imposition of H3K9me3 and HP1α to the promoter of the ancestral Oct4 gene, located on chromosome 17, leading to gene silencing and reduced mESC self-renewal. Targeting Oct4P4 expression in primary mouse embryonic fibroblasts causes the re-acquisition of self-renewing features of mESC. We demonstrate that Oct4P4 lncRNA plays an important role in inducing and maintaining silencing of the ancestral Oct4 gene in differentiating mESCs. Our data introduces a sense pseudogene–lncRNA-based mechanism of epigenetic gene regulation that controls the cross-talk between pseudogenes and their ancestral genes.

Date: 2015
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DOI: 10.1038/ncomms8631

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