• Test Code:
    1167
  • Department:
  • Test Synonyms:
    Ventricular TachycardiaCPVTANK2CALM1CASQ2KCNJ2RYR2TRDN
  • CPT Code(s):
    81408
Background:

The inherited arrhythmias comprise a group of genetically heterogeneous diseases Brugada Syndrome, Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT), Long QT Syndrome, and Short QT Syndrome.  These disorders have an impact across all age groups. 

Individuals with CPVT experience episodes of ventricular tachycardia induced by exercise or acute emotions which can lead to light-headedness, dizziness, and syncope. The prevalence of CPVT is estimated at 1/10,000. This next-generation sequencing test is designed to detect mutations in the coding region of 6 genes associated with Catecholaminergic Polymorphic Ventricular Tachycardia.

Reasons for Referral:

  • Presence of arrhythmia.
  • Clinical presentation consistent with CPVT.
  • Positive family history for arrhythmia (targeted testing is available if familial mutation is known).
  • Carrier testing.

Methodology:

Next generation sequencing will analyze the exons or coding regions of 6 Catecholaminergic Polymorphic Ventricular Tachycardia-associated genes using Illumina NextSeq 500 technology.  Samples are prepared using hybridization probes to enrich exonic regions.  Promoter, intronic, etc. regions are not assessed on our assay, but may contain variants that impact gene function.

Catecholaminergic Polymorphic Ventricular Tachycardia (6 genes):  ANK2, CALM1, CASQ2, KCNJ2, RYR2, TRDN

Specimen Requirements:

Blood: EDTA or ACD (Solution A or B):

  • Adult: 5 mL
  • Child: 5 mL
  • Infant: 2-3 mL

Saliva: 2 ORAgene Saliva Kit(s) (OGR-500)
Skin Fibroblast: Punch Biopsy, or 2 T-25 confluent flasks
DNA: 1-2µg at a minimum of 50-100ng/µL (DNA must be extracted in a CLIA-certified laboratory or a laboratory meeting equivalent requirements as determined by the CAP and/or CMS)

For routine testing of blood, saliva and buccal swabs, KDL does NOT accept samples from patients within two (2) weeks of a packed cell/platelet transfusion or within four (4) weeks of a whole blood transfusion.  For extraordinary circumstances, where testing must be performed outside of the above windows, please contact our lab.

A REQUISITION FORM MUST ACCOMPANY ALL SAMPLES.  Please include detailed clinical information, including ethnicity, clinical history, and family history.

Test Performed (Days):

Weekly

Turn Around Time:

8 weeks

Shipment Sensitivity Requirements:

  • Package and ship specimen to remain cold, but not frozen. 
  • Ship via overnight express, using the FedEx priority overnight label provided. 
  • Contact Client Services for shipping kits and instructions at (855) 535-1522.

References:

  1. GeneReviews: Napolitano et al., 2014, http://www.ncbi.nlm.nih.gov/books/NBK1289/
  2. Genetics Home Reference: http://ghr.nlm.nih.gov/condition/catecholaminergic-polymorphic-ventricular-tachycardia

Additional Info:

The Knight Cancer Institute at Oregon Health & Science University is a pioneer in the field of precision cancer medicine. The institute's director, Brian Druker, M.D., helped prove it was possible to shut down just the cells that enable cancer to grow. This breakthrough has made once-fatal forms of the disease manageable and transformed how cancer is treated. The OHSU Knight Cancer Institute is the only National Cancer Institute-designated Cancer Center between Sacramento and Seattle – an honor earned only by the nation's top cancer centers. It is headquarters for one of the National Cancer Institute's largest research collaboratives, SWOG, in addition to offering the latest treatments and technologies as well as hundreds of research studies and clinical trials.

Learn More