Genome-wide analysis identifies a functional association of Tet1 and Polycomb repressive complex 2 in mouse embryonic stem cells

Genome Biology

Salvatore Oliviero²  Caterina Parlato³  Riccardo Zecchina¹  Andrea Pagnani¹  Stefania Rapelli²  Anna Krepelova²  Danny Incarnato²  Francesco Neri³ 

[1] Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy;Dipartimento di Biotecnologie Chimica e Farmacia Università degli Studi di Siena. Via Fiorentina 1, 53100 Siena, Italy;Human Genetics Foundation (HuGeF), via Nizza 52, 10126, Torino, Italy

关键词: Fibroblasts;    Brain;    Liver;    Stem Cells;    PRC2;    Chip-Seq;    DNA-hydrossymethylation;   

Others  :  864032
DOI  :  10.1186/gb-2013-14-8-r91

 received in 2013-03-28, accepted in 2013-08-29,  发布年份 2013

【 摘 要 】

Background

Ten-Eleven Translocation (TETs)proteins mediate the oxidation of 5-methylcytosine (5mC) to 5-hydroxymethylcytosine (5hmC). Tet1 is expressed at high levels in mouse embryonic stem cells (ESCs), where it mediates the induction of 5hmC decoration on gene-regulatory elements. While the function of Tet1 is known, the mechanisms of its specificity remain unclear.

Results

We perform a genome-wide comparative analysis of 5hmC in pluripotent ESCs, as well as in differentiated embryonic and adult cells. We find that 5hmC co-localization with Polycomb repressive complex 2 (PRC2) is specific to ESCs and is absent in differentiated cells. Tet1 in ESCs is distributed on bivalent genes in two independent pools: one with Sin3a centered at non-hydroxymethylated transcription start sites and another centered downstream from these sites. This latter pool of Tet1 co-localizes with 5hmC and PRC2. Through co-immunoprecipitation experiments, we show that Tet1 forms a complex with PRC2 specifically in ESCs. Genome-wide analysis of 5hmC profiles in ESCs following knockdown of the PRC2 subunit Suz12 shows a reduction of 5hmC within promoter sequences, specifically at H3K27me3-positive regions of bivalent promoters.

Conclusions

In ESCs, PRC2 recruits Tet1 to chromatin at H3K27me3 positive regions of the genome, with 5hmC enriched in a broad peak centered 455 bp after the transcription start site and dependent on the PRC2 component Suz12. These results suggest that PRC2-dependent recruitment of Tet1 contributes to epigenetic plasticity throughout cell differentiation.

【 授权许可】

   
2013 Neri et al.; licensee BioMed Central Ltd.

【 图 表 】

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