Ezh2 mediated H3K27me3 activity facilitates somatic transition during human pluripotent reprogramming.

Abstract:

:Factor induced reprogramming of fibroblasts is an orchestrated but inefficient process. At the epigenetic level, it results in drastic chromatin changes to erase the existing somatic "memory" and to establish the pluripotent state. Accordingly, alterations of chromatin regulators including Ezh2 influence iPSC generation. While the role of individual transcription factors in resetting the chromatin landscape during iPSC generation is increasingly evident, their engagement with chromatin modulators remains to be elucidated. In the current study, we demonstrate that histone methyl transferase activity of Ezh2 is required for mesenchymal to epithelial transition (MET) during human iPSC generation. We show that the H3K27me3 activity favors induction of pluripotency by transcriptionally targeting the TGF-β signaling pathway. We also demonstrate that the Ezh2 negatively regulates the expression of pro-EMT miRNA's such as miR-23a locus during MET. Unique association of Ezh2 with c-Myc was required to silence the aforementioned circuitry. Collectively, our findings provide a mechanistic understanding by which Ezh2 restricts the somatic programme during early phase of cellular reprogramming and establish the importance of Ezh2 dependent H3K27me3 activity in transcriptional and miRNA modulation during human iPSC generation.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Rao RA,Dhele N,Cheemadan S,Ketkar A,Jayandharan GR,Palakodeti D,Rampalli S

doi

10.1038/srep08229

subject

Has Abstract

pub_date

2015-02-04 00:00:00

pages

8229

issn

2045-2322

pii

srep08229

journal_volume

5

pub_type

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