DOT1L-mediated H3K79me2 Modification Critically Regulates Gene Expression During Cardiomyocyte Differentiation

Overview

Journal Cell Death Differ

Specialty Cell Biology

Date 2014 Dec 20

PMID 25526092

Citations 35

Authors

P Cattaneo

P Kunderfranco

C Greco

A Guffanti

G G Stirparo

F Rusconi

R Rizzi

E Di Pasquale

S L Locatelli

M V G Latronico

C Bearzi

R Papait

G Condorelli

Affiliations

Soon will be listed here.

Abstract

Epigenetic changes on DNA and chromatin are implicated in cell differentiation and organogenesis. For the heart, distinct histone methylation profiles were recently linked to stage-specific gene expression programs during cardiac differentiation in vitro. However, the enzymes catalyzing these modifications and the genes regulated by them remain poorly defined. We therefore decided to identify the epigenetic enzymes that are potentially involved in cardiomyogenesis by analyzing the expression profile of the 85 genes encoding the epigenetic-related proteins in mouse cardiomyocytes (CMs), and then study how they affect gene expression during differentiation and maturation of this cell type. We show here with gene expression screening of epigenetic enzymes that the highly expressed H3 methyltransferase disruptor of telomeric silencing 1-like (DOT1L) drives a transitional pattern of di-methylation on H3 lysine 79 (H3K79) in CMs at different stages of differentiation in vitro and in vivo. Through a genome-wide chromatin-immunoprecipitation DNA-sequencing approach, we found H3K79me2 enriched at genes expressed during cardiac differentiation. Moreover, knockdown of Dot1L affected the expression of H3K79me2-enriched genes. Our results demonstrate that histone methylation, and in particular DOT1L-mediated H3K79me2 modification, drives cardiomyogenesis through the definition of a specific transcriptional landscape.

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