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Cardiac performance in the zebrafish breakdance mutant.

Renate Kopp1, Thorsten Schwerte, Bernd Pelster

  • 1Institute of Zoology and Limnology, and Center for Molecular Biosciences, University of Innsbruck, Austria.

The Journal of Experimental Biology
|May 26, 2005
PubMed
Summary

The zebrafish breakdance mutation causes a variable heart rhythm, not a fixed 2:1 ratio. This cardiac arrhythmia, resembling human Long QT Syndrome, affects pacemaker cell activity and reduces cardiac output.

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Area of Science:

  • Cardiovascular Research
  • Developmental Biology
  • Genetics

Background:

  • The zebrafish breakdance (bre) mutant was previously characterized as having a 2:1 atrioventricular block.
  • Cardiac arrhythmias can significantly impact organismal health and development.

Purpose of the Study:

  • To investigate the detailed cardiac performance of homozygous bre mutants during development.
  • To analyze the influence of temperature on the bre mutant phenotype.
  • To compare the bre mutant cardiac phenotype to human arrhythmias.

Main Methods:

  • Continuous cardiac activity recording in zebrafish larvae from 3 to 14 days post-fertilization.
  • Observation of heart rate variability under different temperature conditions (25°C, 28°C, 31°C).
  • Measurement of ventricular pressure and comparison with wild-type zebrafish.

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Main Results:

  • Homozygous bre mutants exhibited a variable heart rhythm, switching between 1:1 and 2:1 atrioventricular conduction, rather than a constant 2:1 rhythm.
  • The expression of the 2:1 rhythm decreased with development and was temperature-dependent, with higher expression at elevated temperatures.
  • Mutants displayed significant bradycardia, reduced cardiac output, and a prolonged ventricular relaxation phase, indicative of AV-block.
  • The phenotype shares similarities with human Long QT Syndrome.

Conclusions:

  • The bre mutation results in a complex cardiac arrhythmia with dynamic rhythm changes and temperature sensitivity.
  • The mutation affects both atrioventricular conduction and potentially pacemaker cell function.
  • The zebrafish bre mutant serves as a valuable model for studying human Long QT Syndrome and related cardiac repolarization disorders.