Development of the cardiac conduction system in zebrafish

Poon, K.L., Liebling, M., Kondrychyn, I., Brand, T., Korzh, V.
Gene expression patterns : GEP   21(2): 89-96 (Journal)
Registered Authors
Brand, Thomas, Kondrychyn, Igor, Korzh, Vladimir, Liebling, Michael, Poon, Kar Lai
Atrio-ventricular canal, Cardiac conduction system, Fhf2a, Sino-atrial node
MeSH Terms
  • Animals
  • Animals, Genetically Modified
  • Atrioventricular Node/growth & development
  • Atrioventricular Node/metabolism
  • DNA Transposable Elements/genetics
  • Enhancer Elements, Genetic/genetics
  • Fibroblast Growth Factors/biosynthesis
  • Fibroblast Growth Factors/genetics*
  • Gene Expression Regulation, Developmental
  • Green Fluorescent Proteins/biosynthesis
  • Green Fluorescent Proteins/genetics
  • Heart Conduction System/growth & development*
  • Heart Conduction System/metabolism
  • Morphogenesis/genetics*
  • Sinoatrial Node/growth & development
  • Sinoatrial Node/metabolism
  • Zebrafish/genetics*
  • Zebrafish/growth & development
27593944 Full text @ Gene Expr. Patterns
The cardiac conduction system (CCS) propagates and coordinates the electrical excitation that originates from the pacemaker cells, throughout the heart, resulting in rhythmic heartbeat. Its defects result in life-threatening arrhythmias and sudden cardiac death. Understanding of the factors involved in the formation and function of the CCS remains incomplete. By transposon assisted transgenesis, we have developed enhancer trap (ET) lines of zebrafish that express fluorescent protein in the pacemaker cells at the sino-atrial node (SAN) and the atrio-ventricular region (AVR), termed CCS transgenics. This expression pattern begins at the stage when the heart undergoes looping morphogenesis at 36 h post fertilization (hpf) and is maintained into adulthood. Using the CCS transgenics, we investigated the effects of perturbation of cardiac function, as simulated by either the absence of endothelium or hemodynamic stimulation, on the cardiac conduction cells, which resulted in abnormal compaction of the SAN. To uncover the identity of the gene represented by the EGFP expression in the CCS transgenics, we mapped the transposon integration sites on the zebrafish genome to positions in close proximity to the gene encoding fibroblast growth homologous factor 2a (fhf2a). Fhf2a is represented by three transcripts, one of which is expressed in the developing heart. These transgenics are useful tools for studies of development of the CCS and cardiac disease.
Genes / Markers
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Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Engineered Foreign Genes