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Related Concept Videos

Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Combinatorial Gene Control02:33

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...

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Related Experiment Video

Updated: May 26, 2026

Imaging Cleared Embryonic and Postnatal Hearts at Single-cell Resolution
07:30

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Published on: October 7, 2016

Polycomb repressive complex 2 regulates normal development of the mouse heart.

Aibin He1, Qing Ma, Jingjing Cao

  • 1Department of Cardiology, Children's Hospital Boston, MA, USA.

Circulation Research
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

Early inactivation of EZH2, a key epigenetic regulator, caused severe congenital heart defects in mice. This highlights the critical role of Polycomb repressive complex 2 (PRC2) in heart development and differentiation.

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Cardiovascular Research

Background:

  • Epigenetic marks are vital for organ development, but their specific role in heart formation remains unclear.
  • Polycomb repressive complex 2 (PRC2) establishes H3K27me3 marks, silencing genes to facilitate tissue-specific differentiation.

Purpose of the Study:

  • To investigate the function of PRC2 in murine heart development.
  • To understand the impact of PRC2 subunit Ezh2 inactivation on cardiac formation.

Main Methods:

  • Utilized a tissue-restricted conditional inactivation strategy for the PRC2 subunit Ezh2 in mice.
  • Employed RNA expression profiling and chromatin immunoprecipitation to identify EZH2-regulated genes.

Main Results:

  • Inactivation of Ezh2 led to lethal congenital heart malformations, including hypoplasia and septal defects.
  • Upregulation of cell cycle inhibitors (Ink4a/b) was observed, correlating with reduced cardiomyocyte proliferation.
  • EZH2 repression is crucial for silencing non-cardiomyocyte genes (e.g., Pax6, Isl1) and maintaining proper cardiac gene expression (e.g., Hcn4, Mlc2a).

Conclusions:

  • Reveals a novel role for EZH2 in regulating heart formation.
  • Demonstrates that early epigenetic dysregulation during cardiogenesis has lasting effects on later development.