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Competent for commitment: you've got to have heart!
Rajan Jain1, Jonathan A Epstein1
1Department of Medicine, Department of Cell and Developmental Biology, Institute for Regenerative Medicine, Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Insights
Understanding cardiac progenitor cell development is key to treating heart disease. This review explores how chromatin organization influences cardiac cell specification and development, offering insights for regenerative therapies.
Area of Science:
- Cardiovascular Biology
- Developmental Biology
- Epigenetics
Background:
- The mature heart comprises myocytes, endothelium, smooth muscle, and fibroblasts.
- These cells originate from pluripotent progenitors undergoing lineage restriction.
- Intermediary cell types and regulatory factors in cardiac development are increasingly understood.
Purpose of the Study:
- To review recent advances in cardiac cell specification and gene regulation.
- To introduce and explain the concept of "chromatin competence" in cardiac development.
- To highlight the impact of chromatin organization on cardiac lineage decisions.
Main Methods:
- Review of recent scientific literature on cardiac development.
- Analysis of studies on gene regulation and 3D chromatin organization.
- Synthesis of findings related to progenitor cell identity and competence.
Main Results:
- Cardiac progenitor cells progressively restrict lineage potential during development.
- Extrinsic and cell-autonomous factors influence cardiac lineage decisions.
- Three-dimensional chromatin organization, termed "chromatin competence," underpins progenitor cell responsiveness to inductive cues.
Conclusions:
- Understanding cardiac cell specification is crucial for congenital and adult cardiac disease research.
- Chromatin competence provides a molecular framework for progenitor cell responsiveness.
- This knowledge will guide regenerative therapeutic approaches for cardiac conditions.
Abstract:
The mature heart is composed primarily of four different cell types: cardiac myocytes, endothelium, smooth muscle, and fibroblasts. These cell types derive from pluripotent progenitors that become progressively restricted with regard to lineage potential, giving rise to multipotent cardiac progenitor cells and, ultimately, the differentiated cell types of the heart. Recent studies have begun to shed light on the defining characteristics of the intermediary cell types that exist transiently during this developmental process and the extrinsic and cell-autonomous factors that influence cardiac lineage decisions and cellular competence. This information will shape our understanding of congenital and adult cardiac disease and guide regenerative therapeutic approaches. In addition, cardiac progenitor specification can serve as a model for understanding basic mechanisms regulating the acquisition of cellular identity. In this review, we present the concept of "chromatin competence" that describes the potential for three-dimensional chromatin organization to function as the molecular underpinning of the ability of a progenitor cell to respond to inductive lineage cues and summarize recent studies advancing our understanding of cardiac cell specification, gene regulation, and chromatin organization and how they impact cardiac development.