Utility of post-mortem genetic testing in cases of sudden arrhythmic death syndrome

Najim Lahrouchi, Hariharan Raju, Elisabeth M. Lodder, Efstathios Papatheodorou, James S. Ware, Michael Papadakis, Rafik Tadros, Della Cole, Jonathan R. Skinner, Jackie Crawford, Donald R. Love, Chee J. Pua, Bee Y. Soh, Jaydutt D. Bhalshankar, Risha Govind, Jacob Tfelt-Hansen, Bo G. Winkel, Christian van der Werf, Yanushi D. Wijeyeratne, Greg Mellor & 9 others Jan Till, Marta C. Cohen, Maria Tome-Esteban, Sanjay Sharma, Arthur A.M. Wilde, Stuart A. Cook, Connie R. Bezzina, Mary N. Sheppard, Elijah R. Behr*

*Corresponding author for this work

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

Background: Sudden arrhythmic death syndrome (SADS) describes a sudden death with negative autopsy and toxicological analysis. Cardiac genetic disease is a likely etiology. Objectives: This study investigated the clinical utility and combined yield of post-mortem genetic testing (molecular autopsy) in cases of SADS and comprehensive clinical evaluation of surviving relatives. Methods: We evaluated 302 expertly validated SADS cases with suitable DNA (median age: 24 years; 65% males) who underwent next-generation sequencing using an extended panel of 77 primary electrical disorder and cardiomyopathy genes. Pathogenic and likely pathogenic variants were classified using American College of Medical Genetics (ACMG) consensus guidelines. The yield of combined molecular autopsy and clinical evaluation in 82 surviving families was evaluated. A gene-level rare variant association analysis was conducted in SADS cases versus controls. Results: A clinically actionable pathogenic or likely pathogenic variant was identified in 40 of 302 cases (13%). The main etiologies established were catecholaminergic polymorphic ventricular tachycardia and long QT syndrome (17 [6%] and 11 [4%], respectively). Gene-based rare variants association analysis showed enrichment of rare predicted deleterious variants in RYR2 (p = 5 × 10-5). Combining molecular autopsy with clinical evaluation in surviving families increased diagnostic yield from 26% to 39%. Conclusions: Molecular autopsy for electrical disorder and cardiomyopathy genes, using ACMG guidelines for variant classification, identified a modest but realistic yield in SADS. Our data highlighted the predominant role of catecholaminergic polymorphic ventricular tachycardia and long QT syndrome, especially the RYR2 gene, as well as the minimal yield from other genes. Furthermore, we showed the enhanced utility of combined clinical and genetic evaluation.

Original languageEnglish
Pages (from-to)2134-2145
Number of pages12
JournalJournal of the American College of Cardiology
Volume69
Issue number17
DOIs
Publication statusPublished - 2 May 2017
Externally publishedYes

Bibliographical note

Copyright the Author(s) 2017. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • cardiomyopathy
  • channelopathy
  • molecular autopsy
  • next-generation sequencing
  • unexplained sudden death

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    Lahrouchi, N., Raju, H., Lodder, E. M., Papatheodorou, E., Ware, J. S., Papadakis, M., ... Behr, E. R. (2017). Utility of post-mortem genetic testing in cases of sudden arrhythmic death syndrome. Journal of the American College of Cardiology, 69(17), 2134-2145. https://doi.org/10.1016/j.jacc.2017.02.046