Large conserved domains of low DNA methylation maintained by Dnmt3a.

Abstract:

:Gains and losses in DNA methylation are prominent features of mammalian cell types. To gain insight into the mechanisms that promote shifts in DNA methylation and contribute to changes in cell fate, including malignant transformation, we performed genome-wide mapping of 5-methylcytosine and 5-hydroxymethylcytosine in purified mouse hematopoietic stem cells. We discovered extended regions of low methylation (canyons) that span conserved domains frequently containing transcription factors and are distinct from CpG islands and shores. About half of the genes in these methylation canyons are coated with repressive histone marks, whereas the remainder are covered by activating histone marks and are highly expressed in hematopoietic stem cells (HSCs). Canyon borders are demarked by 5-hydroxymethylcytosine and become eroded in the absence of DNA methyltransferase 3a (Dnmt3a). Genes dysregulated in human leukemias are enriched for canyon-associated genes. The new epigenetic landscape we describe may provide a mechanism for the regulation of hematopoiesis and may contribute to leukemia development.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Jeong M,Sun D,Luo M,Huang Y,Challen GA,Rodriguez B,Zhang X,Chavez L,Wang H,Hannah R,Kim SB,Yang L,Ko M,Chen R,Göttgens B,Lee JS,Gunaratne P,Godley LA,Darlington GJ,Rao A,Li W,Goodell MA

doi

10.1038/ng.2836

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

17-23

issue

1

eissn

1061-4036

issn

1546-1718

pii

ng.2836

journal_volume

46

pub_type

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