ZFIN ID: ZDB-PUB-110503-6
Reconstitution of defective protein trafficking rescues Long-QT syndrome in zebrafish
Meder, B., Scholz, E.P., Hassel, D., Wolff, C., Just, S., Berger, I.M., Patzel, E., Karle, C., Katus, H.A., and Rottbauer, W.
Date: 2011
Source: Biochemical and Biophysical Research Communications   408(2): 218-224 (Journal)
Registered Authors: Berger, Ina, Hassel, David, Just, Steffen, Meder, Benjamin, Rottbauer, Wolfgang
Keywords: arrhythmia, Long QT-syndrome, Genetics, Protein trafficking, Ion channels
MeSH Terms:
  • Animals
  • Disease Models, Animal
  • Ether-A-Go-Go Potassium Channels/genetics
  • Ether-A-Go-Go Potassium Channels/metabolism*
  • HEK293 Cells
  • Heart Rate/genetics
  • Humans
  • Long QT Syndrome/genetics
  • Long QT Syndrome/metabolism*
  • Long QT Syndrome/physiopathology
  • Mutation
  • Protein Transport/genetics
  • Ventricular Dysfunction/genetics
  • Ventricular Dysfunction/physiopathology
  • Zebrafish
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism*
PubMed: 21458413 Full text @ Biochem. Biophys. Res. Commun.
Inherited cardiac arrhythmias are caused by genetic defects in ion channels and associated proteins. Mutations in these channels often do not affect their biophysical properties, but rather interfere with their trafficking to the cell membrane. Accordingly, strategies that could reroute the mutated channels to the membrane should be sufficient to restore the electrical properties of the affected cells, thereby suppressing the underlying arrhythmia. We identified here both, embryonic and adult zebrafish breakdance (bre) as a valuable model for human Long-QT syndrome. Electrocardiograms of adult homozygous bre mutants exhibit significant QT prolongation caused by delayed repolarization of the ventricle. We further show that the bre mutation (zERG(I59S)) disrupts ERG protein trafficking, thereby reducing the amount of active potassium channels on the cell membrane. Interestingly, improvement of channel trafficking by cisapride or dimethylsulfoxid is sufficient to reconstitute ERG channels on the cell membrane in a manner that suffices to suppress the Long-QT induced arrhythmia in breakdance mutant zebrafish. In summary, we show for the first time that therapeutic intervention can cure protein trafficking defects and the associated cardiac arrhythmia in vivo.