Genetically engineered SCN5A mutant pig hearts exhibit conduction defects and arrhythmias

David S. Park, Marina Cerrone, Gregory Morley, Carolina Vasquez, Steven Fowler, Nian Liu, Scott A. Bernstein, Fang Yu Liu, Jie Zhang, Christopher S. Rogers, Silvia G. Priori, Larry A. Chinitz, Glenn I. Fishman

Research output: Contribution to journalArticle

Abstract

SCN5A encodes the α subunit of the major cardiac sodium channel NaV1.5. Mutations in SCN5A are associated with conduction disease and ventricular fibrillation (VF); however, the mechanisms that link loss of sodium channel function to arrhythmic instability remain unresolved. Here, we generated a large-animal model of a human cardiac sodium channelopathy in pigs, which have cardiac structure and function similar to humans, to better define the arrhythmic substrate. We introduced a nonsense mutation originally identified in a child with Brugada syndrome into the orthologous position (E558X) in the pig SCN5A gene. SCN5AE558X/+ pigs exhibited conduction abnormalities in the absence of cardiac structural defects. Sudden cardiac death was not observed in young pigs; however, Langendorff-perfused SCN5AE558X/+ hearts had an increased propensity for pacing-induced or spontaneous VF initiated by short-coupled ventricular premature beats. Optical mapping during VF showed that activity often began as an organized focal source or broad wavefront on the right ventricular (RV) free wall. Together, the results from this study demonstrate that the SCN5AE558X/+ pig model accurately phenocopies many aspects of human cardiac sodium channelopathy, including conduction slowing and increased susceptibility to ventricular arrhythmias.

Original languageEnglish
Pages (from-to)403-412
Number of pages10
JournalJournal of Clinical Investigation
Volume125
Issue number1
DOIs
Publication statusPublished - Jan 2 2015

ASJC Scopus subject areas

  • Medicine(all)

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    Park, D. S., Cerrone, M., Morley, G., Vasquez, C., Fowler, S., Liu, N., Bernstein, S. A., Liu, F. Y., Zhang, J., Rogers, C. S., Priori, S. G., Chinitz, L. A., & Fishman, G. I. (2015). Genetically engineered SCN5A mutant pig hearts exhibit conduction defects and arrhythmias. Journal of Clinical Investigation, 125(1), 403-412. https://doi.org/10.1172/JCI76919