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Comparison of the effects of a truncating and a missense MYBPC3 mutation on contractile parameters of engineered heart tissue.

Authors
  • Wijnker, Paul J M1
  • Friedrich, Felix W2
  • Dutsch, Alexander2
  • Reischmann, Silke2
  • Eder, Alexandra2
  • Mannhardt, Ingra2
  • Mearini, Giulia2
  • Eschenhagen, Thomas2
  • van der Velden, Jolanda3
  • Carrier, Lucie4
  • 1 Department of Experimental Pharmacology and Toxicology, Cardiovascular Research Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Germany; Department of Physiology, Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands. , (Germany)
  • 2 Department of Experimental Pharmacology and Toxicology, Cardiovascular Research Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Germany. , (Germany)
  • 3 Department of Physiology, Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands. , (Netherlands)
  • 4 Department of Experimental Pharmacology and Toxicology, Cardiovascular Research Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; DZHK (German Centre for Cardiovascular Research), Partner Site Hamburg/Kiel/Lübeck, Germany. Electronic address: [email protected] , (Germany)
Type
Published Article
Journal
Journal of Molecular and Cellular Cardiology
Publisher
Elsevier
Publication Date
Aug 01, 2016
Volume
97
Pages
82–92
Identifiers
DOI: 10.1016/j.yjmcc.2016.03.003
PMID: 27108529
Source
Medline
Keywords
License
Unknown

Abstract

Hypertrophic cardiomyopathy (HCM) is a cardiac genetic disease characterized by left ventricular hypertrophy, diastolic dysfunction and myocardial disarray. The most frequently mutated gene is MYBPC3, encoding cardiac myosin-binding protein-C (cMyBP-C). We compared the pathomechanisms of a truncating mutation (c.2373_2374insG) and a missense mutation (c.1591G>C) in MYBPC3 in engineered heart tissue (EHT). EHTs enable to study the direct effects of mutants without interference of secondary disease-related changes. EHTs were generated from Mybpc3-targeted knock-out (KO) and wild-type (WT) mouse cardiac cells. MYBPC3 WT and mutants were expressed in KO EHTs via adeno-associated virus. KO EHTs displayed higher maximal force and sensitivity to external [Ca(2+)] than WT EHTs. Expression of WT-Mybpc3 at MOI-100 resulted in ~73% cMyBP-C level but did not prevent the KO phenotype, whereas MOI-300 resulted in ≥95% cMyBP-C level and prevented the KO phenotype. Expression of the truncating or missense mutation (MOI-300) or their combination with WT (MOI-150 each), mimicking the homozygous or heterozygous disease state, respectively, failed to restore force to WT level. Immunofluorescence analysis revealed correct incorporation of WT and missense, but not of truncated cMyBP-C in the sarcomere. In conclusion, this study provides evidence in KO EHTs that i) haploinsufficiency affects EHT contractile function if WT cMyBP-C protein levels are ≤73%, ii) missense or truncating mutations, but not WT do not fully restore the disease phenotype and have different pathogenic mechanisms, e.g. sarcomere poisoning for the missense mutation, iii) the direct impact of (newly identified) MYBPC3 gene variants can be evaluated.

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