PUBLICATION

Loss of dihydrolipoyl succinyltransferase (DLST) leads to reduced resting heart rate in the zebrafish

Authors
Keßler, M., Berger, I.M., Just, S., Rottbauer, W.
ID
ZDB-PUB-150224-21
Date
2015
Source
Basic Research in Cardiology   110: 468 (Journal)
Registered Authors
Berger, Ina, Just, Steffen, Keßler, Mirjam, Rottbauer, Wolfgang
Keywords
none
MeSH Terms
  • Acyltransferases/genetics
  • Acyltransferases/metabolism*
  • Animals
  • Gene Knockdown Techniques
  • Heart Rate/physiology*
  • Real-Time Polymerase Chain Reaction
  • Zebrafish
PubMed
25697682 Full text @ Basic Res. Cardiol.
Abstract
The genetic underpinnings of heart rate regulation are only poorly understood. In search for genetic regulators of cardiac pacemaker activity, we isolated in a large-scale mutagenesis screen the embryonic lethal, recessive zebrafish mutant schneckentempo (ste). Homozygous ste mutants exhibit a severely reduced resting heart rate with normal atrio-ventricular conduction and contractile function. External electrical pacing reveals that defective excitation generation in cardiac pacemaker cells underlies bradycardia in ste (-/-) mutants. By positional cloning and gene knock-down analysis we find that loss of dihydrolipoyl succinyltransferase (DLST) function causes the ste phenotype. The mitochondrial enzyme DLST is an essential player in the citric acid cycle that warrants proper adenosine-tri-phosphate (ATP) production. Accordingly, ATP levels are significantly diminished in ste (-/-) mutant embryos, suggesting that limited energy supply accounts for reduced cardiac pacemaker activity in ste (-/-) mutants. We demonstrate here for the first time that the mitochondrial enzyme DLST plays an essential role in the modulation of the vertebrate heart rate by controlling ATP production in the heart.
Genes / Markers
Figures
Expression
Phenotype
Mutation and Transgenics
Human Disease / Model Data
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping
Errata and Notes