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Transcriptomic Profiling of the Developing Cardiac Conduction System at Single-Cell Resolution.

William R Goodyer1,2, Benjamin M Beyersdorf1,3, David T Paik1

  • 1From the Cardiovascular Institute (W.R.G., B.M.B., D.T.P., L.T., G.L., J.W.B., O.C., S.C., S.V., J.C.W., S.M.W.), Stanford University School of Medicine, CA.

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Summary
This summary is machine-generated.

This study maps the cardiac conduction system

Keywords:
bioinformaticscardiac conduction systemsingle-cell RNA-sequencing

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Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Genomics
  • Transcriptomics

Background:

  • The cardiac conduction system (CCS) is crucial for heart function but difficult to study due to cell heterogeneity and complex anatomy.
  • Single-cell RNA sequencing (scRNA-seq) offers a powerful approach to analyze gene expression at the individual cell level.

Purpose of the Study:

  • To comprehensively assess the transcriptional landscape of the entire cardiac conduction system (CCS) at single-cell resolution.
  • To identify novel genes and cell subtypes within the developing mouse heart's CCS.

Main Methods:

  • Microdissection of three distinct regions of embryonic day 16.5 mouse hearts: sinoatrial node, atrioventricular node/His region, and bundle branch/Purkinje fiber region.
  • Single-cell RNA sequencing (scRNA-seq) of over 22,000 cells.
  • Bioinformatic analyses including unsupervised weighted gene coexpression network analysis and subcluster analysis.
  • Validation of novel genes using fluorescent in situ hybridization and 3D whole-mount immunolabeling (iDISCO+).

Main Results:

  • Successfully captured major cardiac cell types and identified distinct cell clusters corresponding to CCS components.
  • Discovered numerous novel genes associated with the CCS.
  • Identified and characterized specific CCS cell subtypes, including transitional cells connecting the CCS to the myocardium.

Conclusions:

  • This study provides the first comprehensive single-cell transcriptional atlas of the entire cardiac conduction system during development.
  • The findings offer valuable insights into CCS development and provide a foundation for understanding cardiac diseases.