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Nature DOI:10.1038/nature10953

Chromatin-modifying enzymes as modulators of reprogramming.

Publication TypeJournal Article
Year of Publication2012
AuthorsOnder, TT, Kara, N, Cherry, A, Sinha, AU, Zhu, N, Bernt, KM, Cahan, P, B Marcarci, O, Unternaehrer, J, Gupta, PB, Lander, ES, Armstrong, SA, Daley, GQ
JournalNature
Volume483
Issue7391
Pages598-602
Date Published2012 Mar 04
ISSN1476-4687
KeywordsCellular Reprogramming, Chromatin, DNA Methylation, DNA-Binding Proteins, Enhancer of Zeste Homolog 2 Protein, Fibroblasts, Histones, Homeodomain Proteins, Humans, Induced Pluripotent Stem Cells, Kruppel-Like Transcription Factors, Methylation, Methyltransferases, Nanog Homeobox Protein, Polycomb Repressive Complex 2, Polycomb-Group Proteins, Proto-Oncogene Proteins c-myc, Repressor Proteins, RNA, Small Interfering, RNA-Binding Proteins, Transcription Factors, YY1 Transcription Factor
Abstract

Generation of induced pluripotent stem cells (iPSCs) by somatic cell reprogramming involves global epigenetic remodelling. Whereas several proteins are known to regulate chromatin marks associated with the distinct epigenetic states of cells before and after reprogramming, the role of specific chromatin-modifying enzymes in reprogramming remains to be determined. To address how chromatin-modifying proteins influence reprogramming, we used short hairpin RNAs (shRNAs) to target genes in DNA and histone methylation pathways, and identified positive and negative modulators of iPSC generation. Whereas inhibition of the core components of the polycomb repressive complex 1 and 2, including the histone 3 lysine 27 methyltransferase EZH2, reduced reprogramming efficiency, suppression of SUV39H1, YY1 and DOT1L enhanced reprogramming. Specifically, inhibition of the H3K79 histone methyltransferase DOT1L by shRNA or a small molecule accelerated reprogramming, significantly increased the yield of iPSC colonies, and substituted for KLF4 and c-Myc (also known as MYC). Inhibition of DOT1L early in the reprogramming process is associated with a marked increase in two alternative factors, NANOG and LIN28, which play essential functional roles in the enhancement of reprogramming. Genome-wide analysis of H3K79me2 distribution revealed that fibroblast-specific genes associated with the epithelial to mesenchymal transition lose H3K79me2 in the initial phases of reprogramming. DOT1L inhibition facilitates the loss of this mark from genes that are fated to be repressed in the pluripotent state. These findings implicate specific chromatin-modifying enzymes as barriers to or facilitators of reprogramming, and demonstrate how modulation of chromatin-modifying enzymes can be exploited to more efficiently generate iPSCs with fewer exogenous transcription factors.

URLhttp://dx.doi.org/10.1038/nature10953
DOI10.1038/nature10953
Pubmed

http://www.ncbi.nlm.nih.gov/pubmed/22388813?dopt=Abstract

Alternate JournalNature
PubMed ID22388813
PubMed Central IDPMC3501145
Grant ListCA140575 / CA / NCI NIH HHS / United States
R01 CA140575 / CA / NCI NIH HHS / United States
U01 HL100001 / HL / NHLBI NIH HHS / United States
/ / Howard Hughes Medical Institute / United States
R24 DK092760 / DK / NIDDK NIH HHS / United States