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Updated: Jun 29, 2025
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Imaging Cleared Embryonic and Postnatal Hearts at Single-cell Resolution
Published on: October 7, 2016
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Distinct features of the regenerating heart uncovered through comparative single-cell profiling
Clayton M Carey1, Hailey L Hollins1, Alexis V Schmid1
1School of Biological Sciences, University of Utah, Salt Lake City, UT, 84112, USA.
Biology Open
|March 25, 2024
Summary
Comparing zebrafish and medaka hearts after injury reveals key differences in immune response and cell signaling that explain why zebrafish regenerate cardiac tissue while medaka do not.
Area of Science:
- Cardiovascular Biology
- Comparative Genomics
- Regenerative Medicine
Background:
- Mammals form scar tissue after heart injury, unlike many vertebrates capable of cardiac regeneration.
- Understanding the cellular and molecular basis of cardiac regeneration is crucial for developing therapies for heart damage.
Purpose of the Study:
- To compare cardiac injury responses in zebrafish and medaka, two fish species with differing regenerative capacities.
- To identify cellular and molecular features that distinguish regenerative from non-regenerative cardiac repair.
Main Methods:
- Single-cell transcriptional profiling was used to create a comparative cell atlas of cardiac injury responses.
- Immune cell recruitment, gene expression, and signaling pathways were analyzed in both species.
Main Results:
- Medaka hearts showed altered immune cell recruitment and a pro-inflammatory response, lacking the interferon response seen in zebrafish.
- Pro-regenerative signals (nrg1, retinoic acid) were absent in medaka endothelial and epicardial cells.
- Medaka hearts lacked primordial layer cardiomyocytes and a cardioprotective gene program.
Conclusions:
- Significant variations exist in cardiac cell type responses to injury between zebrafish and medaka.
- Evolutionary divergence impacts cellular features that determine regenerative potential in vertebrates.
