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Title: Cardiac Reprogramming Factors Synergistically Activate Genome-wide Cardiogenic Stage-Specific Enhancers

Journal Article · · Cell Stem Cell
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [3];  [1];  [1];  [1]
  1. Univ. of Texas Southwestern Medical Center, Dallas, TX (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); Univ. of California, Merced, CA (United States)

The cardiogenic transcription factors (TFs) Mef2c, Gata4, and Tbx5 can directly reprogram fibroblasts to induced cardiac-like myocytes (iCLMs), presenting a potential source of cells for cardiac repair. While activity of these TFs is enhanced by Hand2 and Akt1, their genomic targets and interactions during reprogramming are not well studied. We performed genome-wide analyses of cardiogenic TF binding and enhancer profiling during cardiac reprogramming. We found that these TFs synergistically activate enhancers highlighted by Mef2c binding sites and that Hand2 and Akt1 coordinately recruit other TFs to enhancer elements. Intriguingly, these enhancer landscapes collectively resemble patterns of enhancer activation during embryonic cardiogenesis. We further constructed a cardiac reprogramming gene regulatory network and found repression of EGFR signaling pathway genes. Consistently, chemical inhibition of EGFR signaling augmented reprogramming. Thus, by defining epigenetic landscapes these findings reveal synergistic transcriptional activation across a broad landscape of cardiac enhancers and key signaling pathways that govern iCLM reprogramming.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1650065
Journal Information:
Cell Stem Cell, Vol. 25, Issue 1; ISSN 1875-9777
Publisher:
Cell PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Cited By (5)

Mechanistic basis of neonatal heart regeneration revealed by transcriptome and histone modification profiling journal August 2019
The genetic structure and adaptation of Andean highlanders and Amazonians are influenced by the interplay between geography and culture journal December 2020
Landscape of Enhancer-Enhancer Cooperative Regulation during Human Cardiac Commitment journal September 2019
Ameliorating the Fibrotic Remodeling of the Heart through Direct Cardiac Reprogramming journal July 2019
Intensive care for human hearts in pluripotent stem cell models journal March 2020

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