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Splicing misregulation of SCN5A contributes to cardiac-conduction delay and heart arrhythmia in myotonic dystrophy

  • Fernande Freyermuth
  • , Frédérique Rau
  • , Yosuke Kokunai
  • , Thomas Linke
  • , Chantal Sellier
  • , Masayuki Nakamori
  • , Yoshihiro Kino
  • , Ludovic Arandel
  • , Arnaud Jollet
  • , Christelle Thibault
  • , Muriel Philipps
  • , Serge Vicaire
  • , Bernard Jost
  • , Bjarne Udd
  • , John W. Day
  • , Denis Duboc
  • , Karim Wahbi
  • , Tsuyoshi Matsumura
  • , Harutoshi Fujimura
  • , Hideki Mochizuki
  • François Deryckere, Takashi Kimura, Nobuyuki Nukina, Shoichi Ishiura, Vincent Lacroix, Amandine Campan-Fournier, Vincent Navratil, Emilie Chautard, Didier Auboeuf, Minoru Horie, Keiji Imoto, Kuang Yung Lee, Maurice S. Swanson, Adolfo Lopez De Munain, Shin Inada, Hideki Itoh, Kazuo Nakazawa, Takashi Ashihara, Eric Wang, Thomas Zimmer, Denis Furling*, Masanori P. Takahashi, Nicolas Charlet-Berguerand
*Corresponding author for this work
  • Université de Strasbourg
  • Massachusetts General Hospital
  • Sorbonne Universités
  • The University of Osaka
  • Friedrich Schiller University Jena
  • Meiji Pharmaceutical University
  • Tampere University
  • University of Helsinki
  • Vaasa Hospital District
  • Stanford University
  • Université Paris Cité
  • National Hospital Organization Osaka Toneyama Medical Center
  • CNRS
  • Hyogo Medical University
  • Doshisha University
  • The University of Tokyo
  • Université Lyon 1
  • Hospices civils de Lyon
  • Universite Claude Bernard Lyon 1
  • INSERM U1052
  • Shiga University of Medical Science
  • National Institutes of Natural Sciences - National Institute for Physiological Sciences
  • Chang Gung Memorial Hospital
  • University of Florida
  • Hospital Universitario Donostia
  • National Cerebral and Cardiovascular Center

Research output: Contribution to journalJournal Article peer-review

176 Scopus citations

Abstract

Myotonic dystrophy (DM) is caused by the expression of mutant RNAs containing expanded CUG repeats that sequester muscleblind-like (MBNL) proteins, leading to alternative splicing changes. Cardiac alterations, characterized by conduction delays and arrhythmia, are the second most common cause of death in DM. Using RNA sequencing, here we identify novel splicing alterations in DM heart samples, including a switch from adult exon 6B towards fetal exon 6A in the cardiac sodium channel, SCN5A. We find that MBNL1 regulates alternative splicing of SCN5A mRNA and that the splicing variant of SCN5A produced in DM presents a reduced excitability compared with the control adult isoform. Importantly, reproducing splicing alteration of Scn5a in mice is sufficient to promote heart arrhythmia and cardiac-conduction delay, two predominant features of myotonic dystrophy. In conclusion, misregulation of the alternative splicing of SCN5A may contribute to a subset of the cardiac dysfunctions observed in myotonic dystrophy.

Original languageEnglish
Article number11067
JournalNature Communications
Volume7
DOIs
StatePublished - 11 04 2016
Externally publishedYes

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