Embryonic stem cell-derived hemangioblasts remain epigenetically plastic and require PRC1 to prevent neural gene expression.

Abstract:

:Many lineage-specific developmental regulator genes are transcriptionally primed in embryonic stem (ES) cells; RNA Pol(II) is bound at their promoters but is prevented from productive elongation by the activity of polycomb repressive complexes (PRC) 1 and 2. This epigenetically poised state is thought to enable ES cells to rapidly execute multiple differentiation programs and is recognized by a simultaneous enrichment for trimethylation of lysine 4 and trimethylation of lysine 27 of histone H3 (bivalent chromatin) across promoter regions. Here we show that the chromatin profile of this important cohort of genes is progressively modified as ES cells differentiate toward blood-forming precursors. Surprisingly however, neural specifying genes, such as Nkx2-2, Nkx2-9, and Sox1, remain bivalent and primed even in committed hemangioblasts, as conditional deletion of PRC1 results in overt and inappropriate expression of neural genes in hemangioblasts. These data reinforce the importance of PRC1 for normal hematopoietic differentiation and reveal an unexpected epigenetic plasticity of mesoderm-committed hemangioblasts.

journal_name

Blood

journal_title

Blood

authors

Mazzarella L,Jørgensen HF,Soza-Ried J,Terry AV,Pearson S,Lacaud G,Kouskoff V,Merkenschlager M,Fisher AG

doi

10.1182/blood-2010-03-273128

subject

Has Abstract

pub_date

2011-01-06 00:00:00

pages

83-7

issue

1

eissn

0006-4971

issn

1528-0020

pii

blood-2010-03-273128

journal_volume

117

pub_type

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