Genomics

Dataset Information

28

EZH1 and H3K27me3 ChIP-chip data from mouse embryonic stem cells


ABSTRACT: Trimethylation on H3K27 (H3K27me3) mediated by Polycomb repressive complex 2 (PRC2) has been linked to embryonic stem cell (ESC) identity and pluripotency. EZH2, the catalytic subunit of PRC2, has been reported as the sole histone methyltransferase that methylates H3K27 and mediates transcriptional silencing. Analysis of Ezh2(-/-) ESCs suggests existence of an additional enzyme(s) catalyzing H3K27 methylation. We have identified EZH1, a homolog of EZH2 that is physically present in a noncanonical PRC2 complex, as an H3K27 methyltransferase in vivo and in vitro. EZH1 colocalizes with the H3K27me3 mark on chromatin and preferentially preserves this mark on development-related genes in Ezh2(-/-) ESCs. Depletion of Ezh1 in cells lacking Ezh2 abolishes residual methylation on H3K27 and derepresses H3K27me3 target genes, demonstrating a role of EZH1 in safeguarding ESC identity. Ezh1 partially complements Ezh2 in executing pluripotency during ESC differentiation, suggesting that cell-fate transitions require epigenetic specificity. Overall design: We used ChIP-chip to reveal genome-wide locationation of Polycomb protein EZH1 and H3K27me3 mark in undifferentiated wild-type (CJ7) and Ezh2-/- mutant embryonic stem (ES) cells. DNA fragments pulled down by chromatin immunoprecipitation, amplified and hybridization on Affymetrix mouse Tiling 2.0R array sets.

INSTRUMENT(S): [Mm35b_P01R] Affymetrix Mouse Tiling 2.0R Set, Array 1

SUBMITTER: Xiaohua Shen  

PROVIDER: GSE15388 | GEO | 2009-03-25

SECONDARY ACCESSION(S): PRJNA117125

REPOSITORIES: GEO

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Publications

EZH1 mediates methylation on histone H3 lysine 27 and complements EZH2 in maintaining stem cell identity and executing pluripotency.

Shen Xiaohua X   Liu Yingchun Y   Hsu Yu-Jung YJ   Fujiwara Yuko Y   Kim Jonghwan J   Mao Xiaohong X   Yuan Guo-Cheng GC   Orkin Stuart H SH  

Molecular cell 20081101 4


Trimethylation on H3K27 (H3K27me3) mediated by Polycomb repressive complex 2 (PRC2) has been linked to embryonic stem cell (ESC) identity and pluripotency. EZH2, the catalytic subunit of PRC2, has been reported as the sole histone methyltransferase that methylates H3K27 and mediates transcriptional silencing. Analysis of Ezh2(-/-) ESCs suggests existence of an additional enzyme(s) catalyzing H3K27 methylation. We have identified EZH1, a homolog of EZH2 that is physically present in a noncanonica  ...[more]

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