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Genetic testing for inherited cardiac arrhythmias

Individuals carrying a pathogenic variant for a dominantly inherited arrhythmia have a 50% likelihood of passing the variant on to their children, placing them at higher risk of developing the potentially life-threatening condition (1). 

Today, there are a several commercially available sequencing options for genetic testing of inherited arrhythmias, ranging from targeted panels (5-20 genes) to broad pan-arrhythmia panels (170+ genes) and whole exome sequencing (20,000+ genes).  While more comprehensive tests increase the sensitivity of variant detection, they also increase the detection of variants of unknown clinical significance, enhancing the complexity of interpretation. 

Types of inherited arrhythmic disorders

There are several types of inherited arrhythmic disorders. The most common types include:

  • Arrhythmogenic right ventricular dysplasia (ARVD)
  • Brugada syndrome (BrS)
  • Congenital long QT (LQT)
  • Congenital short QT intervals (SQT)
  • Early repolarization syndrome
  • Idiopathic ventricular fibrillation (IVF)

Challenges of interpreting multigene panels for arrhythmic disorders

The greatest challenge with any genetic testing is interpretation of results. However, as NGS panels for inherited arrhythmic disorders continue to increase in size, data analysis and interpretation becomes more complex and time-consuming.

Genetic heterogeneity - most inherited arrhythmia disorders are characterized by mutations in multiple genes.

Variants of unknown significance (VUS) - multigene panel testing increases the number of detected VUS, often in genes with limited evidence.

Specialized knowledge - interpreting genetic results requires a high degree of specialized knowledge.

Future reclassifications - many VUS will  likely require future reclassification  as additional evidence about the variant becomes available.

The QKB difference

"The industry's best kept secret"

The content core of QIAGEN's clinical NGS variant interpretation and reporting solutions, the QIAGEN Knowledge Base (QKB) is unrivalled in breadth, depth, and accuracy, ensuring labs have access to the evidence, peer-reviewed literature, guidelines, drug labels, and clinical trial registries needed to interpret every variant with precision and confidence.

  • Built over 20 years and encompasses over 40 public and proprietary databases

  • Maintained by hundreds of certified MD- and PhD-level expert curators who enter more than 5,000 new findings each day

  • Contains the latest evidence from peer-reviewed papers, clinical and functional studies, on- and off-label drugs, and professional guidelines, such as NCCN, AMP/ASCO/CAP and the World Health Organization (WHO)

  • Updates list of recruiting clinical trials each week

  • 3,000+ QC tests and quality protocols
  • ISO-9001 certified for reproducibility

Solutions for analyzing and interpreting NGS diagnostic and predictive tests for inherited arrhythmia disorders

Featured resources

Variant Interpretation Then and Now
How clinical labs can mprove the standardization and reproducibility of their variant interpretation pipelines
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Breaking the Bottleneck in Clinical Genetic Testing
Best practices for selecting and implementing a tertiary analysis pipeline for variant interpretation
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Power Up Your NGS Variant Knowledge
Discover how HGMD Professional helps labs analyze and annotate NGS data faster and with greater accuracy
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Sample to Insight
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