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Diagnostic yield of molecular autopsy in patients with sudden arrhythmic death syndrome using targeted exome sequencing.
- Source :
- EP: Europace; Jun2016, Vol. 18 Issue 6, p888-896, 9p
- Publication Year :
- 2016
-
Abstract
- <bold>Aims: </bold>The targeted genetic screening of Sudden Arrhythmic Death Syndrome (SADS) probands in a molecular autopsy has a diagnostic yield of up to 35%. Exome sequencing has the potential to improve this yield. The primary aim of this study is to examine the feasibility and diagnostic utility of targeted exome screening in SADS victims, utilizing familial clinical screening whenever possible.<bold>Methods and Results: </bold>To determine the feasibility and diagnostic yield of targeted exome sequencing deoxyribonucleic acid (DNA) was isolated from 59 SADS victims (mean age 25 years, range 1-51 years). Targeted exome sequencing of 135 genes associated with cardiomyopathies and ion channelopathies was performed on the Illumina HiSeq2000 platform. Non-synonymous, loss-of-function, and splice-site variants with a minor allele frequency <0.02% in the NHLBI exome sequencing project and an internal set of control exomes were prioritized for analysis followed by <0.5% frequency threshold secondary analysis. First-degree relatives were offered clinical screening for inherited cardiac conditions. Seven probands (12%) carried very rare (<0.02%) or novel non-sense candidate mutations and 10 probands (17%) had previously published rare (0.02-0.5%) candidate mutations-a total yield of 29%. Co-segregation fully confirmed two private SCN5A Na channel mutations. Variants of unknown significance were detected in a further 34% of probands.<bold>Conclusion: </bold>Molecular autopsy using targeted exome sequencing has a relatively low diagnostic yield of very rare potentially disease causing mutations. Candidate pathogenic variants with a higher frequency in control populations are relatively common and should be interpreted with caution. [ABSTRACT FROM AUTHOR]
- Subjects :
- CARDIAC arrest prevention
LONG QT syndrome diagnosis
BRUGADA syndrome diagnosis
AUTOPSY
COMPARATIVE studies
DISEASE susceptibility
GENEALOGY
GENES
GENETIC techniques
GENOMES
LONGITUDINAL method
RESEARCH methodology
MEDICAL cooperation
GENETIC mutation
RESEARCH
GENETIC testing
LONG QT syndrome
EVALUATION research
BRUGADA syndrome
CASE-control method
SEQUENCE analysis
MEMBRANE transport proteins
Subjects
Details
- Language :
- English
- ISSN :
- 10995129
- Volume :
- 18
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- EP: Europace
- Publication Type :
- Academic Journal
- Accession number :
- 116234355
- Full Text :
- https://doi.org/10.1093/europace/euv285