An international compendium of mutations in the SCN5A-encoded cardiac sodium channel in patients referred for Brugada syndrome genetic testing

Jamie D. Kapplinger, David J. Tester, Marielle Alders, Begoña Benito, Myriam Berthet, Josep Brugada, Pedro Brugada, Véronique Fressart, Alejandra Guerchicoff, Carole Harris-Kerr, Shiro Kamakura, Florence Kyndt, Tamara T. Koopmann, Yoshihiro Miyamoto, Ryan Pfeiffer, Guido D. Pollevick, Vincent Probst, Sven Zumhagen, Matteo Vatta, Jeffrey A. TowbinWataru Shimizu, Eric Schulze-Bahr, Charles Antzelevitch, Benjamin A. Salisbury, Pascale Guicheney, Arthur A.M. Wilde, Ramon Brugada, Jean Jacques Schott, Michael J. Ackerman

Research output: Contribution to journalArticlepeer-review

437 Scopus citations

Abstract

Background: Brugada syndrome (BrS) is a common heritable channelopathy. Mutations in the SCN5A-encoded sodium channel (BrS1) culminate in the most common genotype. Objective: This study sought to perform a retrospective analysis of BrS databases from 9 centers that have each genotyped >100 unrelated cases of suspected BrS. Methods: Mutational analysis of all 27 translated exons in SCN5A was performed. Mutation frequency, type, and localization were compared among cases and 1,300 ostensibly healthy volunteers including 649 white subjects and 651 nonwhite subjects (blacks, Asians, Hispanics, and others) that were genotyped previously. Results: A total of 2,111 unrelated patients (78% male, mean age 39 ± 15 years) were referred for BrS genetic testing. Rare mutations/variants were more common among BrS cases than control subjects (438/2,111, 21% vs. 11/649, 1.7% white subjects and 31/651, 4.8% nonwhite subjects, respectively, P <10-53). The yield of BrS1 genetic testing ranged from 11% to 28% (P = .0017). Overall, 293 distinct mutations were identified in SCN5A: 193 missense, 32 nonsense, 38 frameshift, 21 splice-site, and 9 in-frame deletions/insertions. The 4 most frequent BrS1-associated mutations were E1784K (14×), F861WfsX90 (11×), D356N (8×), and G1408R (7×). Most mutations localized to the transmembrane-spanning regions. Conclusion: This international consortium of BrS genetic testing centers has added 200 new BrS1-associated mutations to the public domain. Overall, 21% of BrS probands have mutations in SCN5A compared to the 2% to 5% background rate of rare variants reported in healthy control subjects. Additional studies drawing on the data presented here may help further distinguish pathogenic mutations from similarly rare but otherwise innocuous ones found in cases.

Original languageEnglish (US)
Pages (from-to)33-46
Number of pages14
JournalHeart rhythm
Volume7
Issue number1
DOIs
StatePublished - Jan 2010

Keywords

  • Brugada syndrome
  • Genetic testing
  • Ion channels
  • Sodium channel
  • Sudden death

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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