ZFIN ID: ZDB-PUB-110124-3
Human cardiomyopathy mutations induce myocyte hyperplasia and activate hypertrophic pathways during cardiogenesis in zebrafish
Becker, J.R., Deo, R.C., Werdich, A.A., Panàkovà, D., Coy, S., and MacRae, C.A.
Date: 2011
Source: Disease models & mechanisms   4(3): 400-410 (Journal)
Registered Authors: MacRae, Calum A.
Keywords: none
Microarrays: GEO:GSE20179
MeSH Terms:
  • Alternative Splicing/drug effects
  • Alternative Splicing/genetics
  • Amino Acid Sequence
  • Animals
  • Calcium/metabolism
  • Cardiomyopathy, Hypertrophic/complications
  • Cardiomyopathy, Hypertrophic/genetics*
  • Cardiomyopathy, Hypertrophic/pathology*
  • Cardiomyopathy, Hypertrophic/physiopathology
  • Embryo, Nonmammalian/drug effects
  • Embryo, Nonmammalian/metabolism
  • Embryo, Nonmammalian/pathology
  • Gene Expression Regulation, Developmental/drug effects
  • Heart/drug effects
  • Heart/embryology*
  • Heart/physiopathology
  • Heart Ventricles/drug effects
  • Heart Ventricles/pathology
  • Heart Ventricles/physiopathology
  • Humans
  • Hyperplasia/complications
  • Hyperplasia/pathology
  • Mice
  • Molecular Sequence Data
  • Mutation/genetics*
  • Myocardial Contraction/drug effects
  • Myocytes, Cardiac/metabolism
  • Myocytes, Cardiac/pathology*
  • Oligonucleotides, Antisense/pharmacology
  • Organogenesis*/drug effects
  • Sarcomeres/drug effects
  • Sarcomeres/pathology
  • Transcription, Genetic/drug effects
  • Troponin T/chemistry
  • Troponin T/genetics
  • Zebrafish/embryology*
  • Zebrafish/genetics
  • Zebrafish Proteins/chemistry
  • Zebrafish Proteins/genetics
PubMed: 21245263 Full text @ Dis. Model. Mech.
To assess the effects during cardiac development of mutations that cause human cardiomyopathy, we modeled a sarcomeric gene mutation in the embryonic zebrafish. We designed morpholino antisense oligonucleotides targeting the exon 13 splice donor site in the zebrafish cardiac troponin T (tnnt2) gene, in order to precisely recapitulate a human TNNT2 mutation that causes hypertrophic cardiomyopathy (HCM). HCM is a disease characterized by myocardial hypertrophy, myocyte and myofibrillar disarray, as well as an increased risk of sudden death. Similar to humans with HCM, the morphant zebrafish embryos displayed sarcomere disarray and there was a robust induction of myocardial hypertrophic pathways. Microarray analysis uncovered a number of shared transcriptional responses between this zebrafish model and a well-characterized mouse model of HCM. However, in contrast to adult hearts, these embryonic hearts developed cardiomyocyte hyperplasia in response to this genetic perturbation. The re-creation of a human disease-causing TNNT2 splice variant demonstrates that sarcomeric mutations can alter cardiomyocyte biology at the earliest stages of heart development with distinct effects from those observed in adult hearts despite shared transcriptional responses.