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A novel member of Prame family, Gm12794c, counteracts retinoic acid differentiation through the methyltransferase activity of PRC2


Embryonic stem cells (ESCs) fluctuate among different levels of pluripotency defined as metastates. Sporadically, metastable cellular populations convert to a highly pluripotent metastate that resembles the preimplantation two-cell embryos stage (defined as 2C stage) in terms of transcriptome, DNA methylation, and chromatin structure. Recently, we found that the retinoic acid (RA) signaling leads to a robust increase of cells specifically expressing 2C genes, such as members of the Prame family. Here, we show that Gm12794c, one of the most highly upregulated Prame members, and previously identified as a key player for the maintenance of pluripotency, has a functional role in conferring ESCs resistance to RA signaling. In particular, RA-dependent expression of Gm12794c induces a ground state-like metastate, as evaluated by activation of 2C-specific genes, global DNA hypomethylation and rearrangement of chromatin similar to that observed in naive totipotent preimplantation epiblast cells and 2C-like cells. Mechanistically, we demonstrated that Gm12794c inhibits Cdkn1A gene expression through the polycomb repressive complex 2 (PRC2) histone methyltransferase activity. Collectively, our data highlight a molecular mechanism employed by ESCs to counteract retinoic acid differentiation stimuli and contribute to shed light on the molecular mechanisms at grounds of ESCs naive pluripotency-state maintenance.

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We thank Dr. D. Antonini for valuable discussion, Dr. Pietro Zoppoli for supporting statistical analysis, Dr. Floriana Della Ragione for the kind gift of the LNA probe and Prof. Enrico Avvedimento for the kind gift of the anti-5mC antibody. This work was supported by Biogem, Istituto di Biologia e Genetica Molecolare, Via Camporeale, Ariano Irpino (AV), STAR Linea 1, 2014 (University of Naples Federico II). InterOmics 2017 “PROPAGA” (IEOS, CNR) to GF.

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Correspondence to Giuliana Napolitano or Geppino Falco.

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RAW data SB_fig 1

RAW data p21-FLAG NIH3T3 GSK series_fig 5

RAW data H£K27me3 Rosa26 cells GSK series_fig 5

RAW data FLAG-act-NIH3T3 _fig 4_6

RAW data act-p21 Rosa26 cells_fig 4

RAW data act-NIH3T3 GSK series_fig 5

RAW data act-p21 Rosa26 cells GSK series_fig 5

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