Hey2 regulates the size of the cardiac progenitor pool during vertebrate heart development

Development. 2018 Nov 21;145(22):dev167510. doi: 10.1242/dev.167510.


A key event in heart development is the timely addition of cardiac progenitor cells, defects in which can lead to congenital heart defects. However, how the balance and proportion of progenitor proliferation versus addition to the heart is regulated remains poorly understood. Here, we demonstrate that Hey2 functions to regulate the dynamics of cardiac progenitor addition to the zebrafish heart. We found that the previously noted increase in myocardial cell number found in the absence of Hey2 function was due to a pronounced expansion in the size of the cardiac progenitor pool. Expression analysis and lineage tracing of hey2-expressing cells showed that hey2 is active in cardiac progenitors. Hey2 acted to limit proliferation of cardiac progenitors, prior to heart tube formation. Use of a transplantation approach demonstrated a likely cell-autonomous (in cardiac progenitors) function for Hey2. Taken together, our data suggest a previously unappreciated role for Hey2 in controlling the proliferative capacity of cardiac progenitors, affecting the subsequent contribution of late-differentiating cardiac progenitors to the developing vertebrate heart.

Keywords: Cardiac progenitors; Heart development; Hey2; Second heart field; Zebrafish.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Basic Helix-Loop-Helix Transcription Factors / genetics
  • Basic Helix-Loop-Helix Transcription Factors / metabolism*
  • Cardiovascular Diseases / pathology
  • Cell Count
  • Cell Lineage
  • Cell Proliferation
  • Cell Size
  • Fibroblast Growth Factors / metabolism
  • Gene Expression Regulation, Developmental
  • Heart / embryology*
  • Mutation / genetics
  • Myocardium / metabolism
  • Myocardium / pathology
  • Myocytes, Cardiac / metabolism
  • Myocytes, Cardiac / pathology
  • Signal Transduction
  • Stem Cells / cytology*
  • Stem Cells / metabolism*
  • Zebrafish / embryology*
  • Zebrafish / genetics
  • Zebrafish / metabolism*
  • Zebrafish Proteins / genetics
  • Zebrafish Proteins / metabolism*


  • Basic Helix-Loop-Helix Transcription Factors
  • Zebrafish Proteins
  • hey2 protein, zebrafish
  • Fibroblast Growth Factors