Brugada Syndrome via the CACNB2 Gene

Summary and Pricing

Test Method

Exome Sequencing with CNV Detection
Test Code Test Copy GenesTest CPT Code Gene CPT Codes Copy CPT Codes Base Price
11131 CACNB2 81406 81406,81479 $890 Order Options and Pricing
Test Code Test Copy Genes Test CPT Code Gene CPT Codes Copy CPT Code Base Price
11131CACNB281406 81406, 81479 $890 Order Options and Pricing

Pricing Comments

Our favored testing approach is exome based NextGen sequencing with CNV analysis. This will allow cost effective reflexing to PGxome or other exome based tests. However, if full gene Sanger sequencing is desired for STAT turnaround time, insurance, or other reasons, please see link below for Test Code, pricing, and turnaround time information. If the Sanger option is selected, CNV detection may be ordered through Test #600.

A 25% additional charge will be applied to STAT orders. View STAT turnaround times here.

For Reflex to PGxome pricing click here.

The Sanger Sequencing method for this test is NY State approved.

For Sanger Sequencing click here.

Targeted Testing

For ordering sequencing of targeted known variants, go to our Targeted Variants page.

Turnaround Time

18 days on average

EMAIL CONTACTS

Genetic Counselors

Geneticist

Clinical Features and Genetics

Clinical Features

Brugada syndrome (BrS) is a potentially life-threating arrhythmia disorder without structural abnormalities, characterized by dizziness, syncope, nocturnal agonal respiration and sudden death. The classic electrocardiographic findings associated with BrS include ST segment elevation in leads V1 to V3, right bundle branch block, first degree AV block, intraventricular conduction delay, etc. Brugada syndrome is much more common in men than in women, and many people who have BrS don't have any symptoms. Symptoms usually manifest during adulthood, but they may appear any time between two days and 80 years of age (Antzelevitch et al. 2005). BrS is treatable with preventive measures such as reducing fever, avoiding certain medications and using an implantable cardiac defibrillator when necessary (Francis and Antzelevitch 2005).

Genetics

Brugada syndrome is an autosomal dominant disorder with variable expression, resulting from mutations within genes that encode cardiac ion channels. BrS is also referred to as a “cardiac channelopathy.” Mutations in 16 genes ( CACNA1C , CACNB2, CACNA2D1 , GPD1L , KCND3 , K CNE3 , KCNE5, KC NJ8 , HCN4 , R ANGRF , SCN5A , SCN 1B , SCN2B , SCN3B , SLMAP, an d TRPM4) influencing sodium and calcium currents in the heart are associated with BrS and account for at least 26%-41% of cases of BrS (Kapplinger et al 2010; Crotti et al. 2012). Most patients with BrS have inherited a disease-causing mutation from a parent, as de novo mutations in BrS are rare (Hedley et al. 2009).

CACNB2 encodes the cardiac voltage-dependent L-type calcium channel (LTCC) Beta-2 subunit. L-type calcium channels (LTCC) regulate calcium entry into cardiomyocytes. CACNB2 protein LTCC auxiliary subunits traffic the pore-forming Alpha-1C subunit (CACNA1C) to the membrane, modulate channel kinetics and play important role in excitation-contraction coupling (Catterall et al. 2005). Most causative mutations reported in CACNB2 are missense mutations, including all reported to cause BrS (Human Gene Mutation Database).

Testing Strategy

This test provides full coverage of all coding exons of the CACNB2 gene plus 10 bases of flanking noncoding DNA in all available transcripts along with other non-coding regions in which pathogenic variants have been identified at PreventionGenetics or reported elsewhere. We define full coverage as >20X NGS reads or Sanger sequencing.

Since this test is performed using exome capture probes, a reflex to any of our exome based tests is available (PGxome, PGxome Custom Panels).

Clinical Sensitivity - Sequencing with CNV PGxome

Mutations in the SCN5A gene cause 15%-30% of Brugada syndrome based on clinical diagnosis. Another 5% of patients with BrS have pathogenic variants in one of the following genes: GPD1L, CACNA1C, CACNB2, SCN1B, SCN3B, KCNE3, KCNJ8, KCND3, CACNA2D1, MOG1 and HCN4 (Kapplinger et al. 2010; Crotti et al. 2012).

Indications for Test

All patients with symptoms suggestive of Brugada syndrome are candidates for this test.

Gene

Official Gene Symbol OMIM ID
CACNB2 600003
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT

Disease

Name Inheritance OMIM ID
Brugada Syndrome 4 611876

Citations

  • Antzelevitch C. et al. 2005. Circulation. 111: 659-70. PubMed ID: 15655131
  • Catterall WA, Perez-Reyes E, Snutch TP, Striessnig J. 2005. International Union of Pharmacology. XLVIII. Nomenclature and structure-function relationships of voltage-gated calcium channels. Pharmacol. Rev. 57: 411–425. PubMed ID: 16382099
  • Crotti L. et al. 2012. Journal of the American College of Cardiology. 60: 1410-8. PubMed ID: 22840528
  • Francis J., Antzelevitch C. 2005. International journal of cardiology. 101: 173-8. PubMed ID: 15882659
  • Hedley PL. et al. 2009. Human mutation. 30: 1256-66. PubMed ID: 19606473
  • Human Gene Mutation Database (Bio-base).
  • Kapplinger JD. et al. 2010. Heart rhythm : the official journal of the Heart Rhythm Society. 7: 33-46. PubMed ID: 20129283
  • Syrmou A, Tzetis M, Fryssira H, Kosma K, Oikonomakis V, Giannikou K, Makrythanasis P, Kitsiou-Tzeli S, Kanavakis E. 2013. Array comparative genomic hybridization as a clinical diagnostic tool in syndromic and nonsyndromic congenital heart disease. Pediatric Research 73: 772-776. PubMed ID: 23481551

Ordering/Specimens

Ordering Options

We offer several options when ordering sequencing tests. For more information on these options, see our Ordering Instructions page. To view available options, click on the Order Options button within the test description.

myPrevent - Online Ordering

  • The test can be added to your online orders in the Summary and Pricing section.
  • Once the test has been added log in to myPrevent to fill out an online requisition form.

Requisition Form

  • A completed requisition form must accompany all specimens.
  • Billing information along with specimen and shipping instructions are within the requisition form.
  • All testing must be ordered by a qualified healthcare provider.

For Requisition Forms, visit our Forms page


Specimen Types

Specimen Requirements and Shipping Details

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ORDER OPTIONS

View Ordering Instructions

1) Select Test Type


2) Select Additional Test Options

STAT and Prenatal Test Options are not available with Patient Plus.

No Additional Test Options are available for this test.

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