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Genetically encoded probes provide a window on embryonic arrhythmia.

Yvonne Norine Tallini1, Kai Su Greene, Bo Shui

  • 1Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.

Methods in Molecular Biology (Clifton, N.J.)
|December 10, 2013
PubMed
Summary

Researchers used a new imaging technique to study early heart development and electrical activity in mouse embryos. This method reveals crucial details about cardiac conduction and potential causes of congenital heart defects.

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Area of Science:

  • Developmental Biology
  • Cardiovascular Research
  • Molecular Imaging

Background:

  • Supraventricular tachycardias are common in infants, but the molecular causes of embryonic cardiac dysfunction remain unclear.
  • Existing imaging techniques lack the cellular and molecular resolution needed for early heart development studies.

Purpose of the Study:

  • To investigate cardiac electrical activation during embryonic development using advanced imaging.
  • To understand the genetic basis of heart development and cardiac dysfunction.

Main Methods:

  • Utilized GCaMP2, a genetically encoded calcium indicator (GECI), for high-resolution optical imaging in mouse embryos.
  • Developed transgenic mouse lines for GCaMP2 expression starting at embryonic day 9.5.
  • Examined cardiac conduction in pre-septated hearts (embryonic day 10.5) and employed lineage-specific targeting.

Main Results:

  • Successfully imaged cardiac electrical activation in mouse embryos as early as embryonic day 9.5.
  • Observed significantly slowed atrioventricular canal conduction in the pre-septated heart, preceding AV node formation.
  • Demonstrated the utility of GCaMP2 for studying conduction and excitation-contraction coupling phenotypes.

Conclusions:

  • Genetically encoded calcium indicators provide unprecedented insights into embryonic heart conduction.
  • This imaging approach facilitates the study of genetic mutations' impact on heart development.
  • Offers a new window into the molecular specification of the heart conduction system.