Hand2 Selectively Reorganizes Chromatin Accessibility to Induce Pacemaker-like Transcriptional Reprogramming

Antonio Fernandez-Perez, Adwait Amod Sathe, Minoti Bhakta, Kayla Leggett, Chao Xing, Nikhil V Munshi

Research output: Contribution to journalArticle

Abstract

Gata4, Hand2, Mef2c, and Tbx5 (GHMT) can reprogram transduced fibroblasts into induced pacemaker-like myocytes (iPMs), but the underlying mechanisms remain obscure. Here, we explore the role of Hand2 in iPM formation by using a combination of transcriptome, genome, and biochemical assays. We found many shared transcriptional signatures between iPMs and the endogenous sinoatrial node (SAN), yet key regulatory networks remain missing. We demonstrate that Hand2 augments chromatin accessibility at loci involved in sarcomere organization, electrical coupling, and membrane depolarization. Focusing on an established cardiac Hand2 cistrome, we observe selective reorganization of chromatin accessibility to promote pacemaker-specific gene expression. Moreover, we identify a Hand2 cardiac subtype diversity (CSD) domain through biochemical analysis of the N terminus. By integrating our RNA-seq and ATAC-seq datasets, we highlight desmosome organization as a hallmark feature of iPM formation. Collectively, our results illuminate Hand2-dependent mechanisms that may guide future efforts to rationally improve iPM formation.

Original languageEnglish (US)
Pages (from-to)2354-2369.e7
JournalCell Reports
Volume27
Issue number8
DOIs
StatePublished - May 21 2019

Keywords

  • chromatin accessibility
  • desmosome
  • gene expression
  • pacemaker
  • reprogramming
  • transcriptome

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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