Corrupted coordination of epigenetic modifications leads to diverging chromatin states and transcriptional heterogeneity in CLL.

Abstract:

:Cancer evolution is fueled by epigenetic as well as genetic diversity. In chronic lymphocytic leukemia (CLL), intra-tumoral DNA methylation (DNAme) heterogeneity empowers evolution. Here, to comprehensively study the epigenetic dimension of cancer evolution, we integrate DNAme analysis with histone modification mapping and single cell analyses of RNA expression and DNAme in 22 primary CLL and 13 healthy donor B lymphocyte samples. Our data reveal corrupted coherence across different layers of the CLL epigenome. This manifests in decreased mutual information across epigenetic modifications and gene expression attributed to cell-to-cell heterogeneity. Disrupted epigenetic-transcriptional coordination in CLL is also reflected in the dysregulation of the transcriptional output as a function of the combinatorial chromatin states, including incomplete Polycomb-mediated gene silencing. Notably, we observe unexpected co-mapping of typically mutually exclusive activating and repressing histone modifications, suggestive of intra-tumoral epigenetic diversity. Thus, CLL epigenetic diversification leads to decreased coordination across layers of epigenetic information, likely reflecting an admixture of cells with diverging cellular identities.

journal_name

Nat Commun

journal_title

Nature communications

authors

Pastore A,Gaiti F,Lu SX,Brand RM,Kulm S,Chaligne R,Gu H,Huang KY,Stamenova EK,Béguelin W,Jiang Y,Schulman RC,Kim KT,Alonso A,Allan JN,Furman RR,Gnirke A,Wu CJ,Melnick AM,Meissner A,Bernstein BE,Abdel-Wahab O,L

doi

10.1038/s41467-019-09645-5

subject

Has Abstract

pub_date

2019-04-23 00:00:00

pages

1874

issue

1

issn

2041-1723

pii

10.1038/s41467-019-09645-5

journal_volume

10

pub_type

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