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Epileptic Encephalopathy and Intellectual Disability via the CHD2 Gene

Summary and Pricing

Test Method

Sequencing and CNV Detection via NextGen Sequencing using PG-Select Capture Probes
Test Code Test Copy GenesTest CPT Code Gene CPT Codes Copy CPT Codes Base Price
4123 CHD2 81479 81479,81479 $640 Order Options and Pricing
Test Code Test Copy Genes Test CPT Code Gene CPT Codes Copy CPT Code Base Price
4123CHD281479 81479(x2) $640 Order Options and Pricing

Pricing Comments

This test is also offered via our exome backbone with CNV detection (click here). The exome-based test may be higher priced, but permits reflex to the entire exome or to any other set of clinically relevant genes.

An additional 25% charge will be applied to STAT orders. STAT orders are prioritized throughout the testing process.

Turnaround Time

18 days on average for standard orders or 13 days on average for STAT orders.

Please note: Once the testing process begins, an Estimated Report Date (ERD) range will be displayed in the portal. This is the most accurate prediction of when your report will be complete and may differ from the average TAT published on our website. About 85% of our tests will be reported within or before the ERD range. We will notify you of significant delays or holds which will impact the ERD. Learn more about turnaround times here.

Targeted Testing

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

EMAIL CONTACTS

Genetic Counselors

Geneticist

  • Eric Bend, PhD

Clinical Features and Genetics

Clinical Features

Epileptic encephalopathy with childhood onset (EEOC; OMIM:615369) is a neurocognitive disorder characterized by seizure onset within the first 3 years of life and moderate to severe intellectual disability. Seizure types observed in EEOC include myoclonic, absence, tonic, tonic-clonic and febrile. Developmental delay, language impairment and cognitive regression are features commonly seen in EEOC cases (Carvill et al. 2013; Capelli et al. 2012).

Genetics

EEOC can be caused by heterozygous variations in the CHD2 gene. Reported cases of EEOC are sporadic and may result from de novo mutations in the CHD2 gene. Missense, nonsense, splice site and frameshift variants in CHD2 as well as large deletions encompassing the CHD2 locus have been reported in patients with epilepsy and intellectually disability (Carvill et al. 2013; Capelli et al. 2012; Rauch et al. 2012). CHD2 encodes a chromodomain helicase DNA-binding protein (CHD). CHD family members have been implicated in chromatin remodeling, transcriptional regulation and DNA damage repair (Marfella and Imbalzano 2007; Rajagopalan et al. 2012).

Clinical Sensitivity - Sequencing with CNV PG-Select

Targeted sequencing of 500 patients with epileptic encephalopathies identified causative de novo missense and nonsense CHD2 variants in ~1% (6/500) of cases (Carvill et al. 2013). Another study of patients with non-syndromic sporadic intellectual disability identified ~2% (1/51) of patients with causative CHD2 variants (Rauch et al. 2012).

Testing Strategy

This test provides full coverage of all coding exons of the CHD2 gene, plus ~10 bases of flanking noncoding DNA. We define full coverage as >20X NGS reads or Sanger sequencing.

Indications for Test

Candidates for CHD2 testing include patients with sporadic epilepsy or intellectual disability of unknown cause.

Gene

Official Gene Symbol OMIM ID
CHD2 602119
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT

Disease

Name Inheritance OMIM ID
Epileptic encephalopathy, childhood-onset AD 615369

Citations

  • Capelli LP, Krepischi ACV, Gurgel-Giannetti J, Mendes MFS, Rodrigues T, Varela MC, Koiffmann CP, Rosenberg C. 2012. Deletion of the RMGA and CHD2 genes in a child with epilepsy and mental deficiency. European Journal of Medical Genetics 55: 132–134. PubMed ID: 22178256
  • Carvill GL, Heavin SB, Yendle SC, McMahon JM, O’Roak BJ, Cook J, Khan A, Dorschner MO, Weaver M, Calvert S, Malone S, Wallace G, Stanley T, Bye AM, Bleasel A, Howell KB, Kivity S, Mackay MT, Rodriguez-Casero V, Webster R, Korczyn A, Afawi Z, Zelnick N, Lerman-Sagie T, Lev D, Møller RS, Gill D, Andrade DM, Freeman JL, Sadleir LG, Shendure J, Berkovic SF, Scheffer IE, Mefford HC. 2013. Targeted resequencing in epileptic encephalopathies identifies de novo mutations in CHD2 and SYNGAP1. Nature Genetics 45: 825–830. PubMed ID: 23708187
  • Marfella CG, Imbalzano AN. 2007. The Chd family of chromatin remodelers. Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 618: 30–40. PubMed ID: 17350655
  • Rajagopalan S, Nepa J, Venkatachalam S. 2012. Chromodomain helicase DNA-binding protein 2 affects the repair of X-ray and UV-Induced DNA damage. Environmental and Molecular Mutagenesis 53: 44–50. PubMed ID: 22223433
  • Rauch A, Wieczorek D, Graf E, Wieland T, Endele S, Schwarzmayr T, Albrecht B, Bartholdi D, Beygo J, Donato N Di. 2012. Range of genetic mutations associated with severe non-syndromic sporadic intellectual disability: an exome sequencing study. The Lancet. PubMed ID: 23020937

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.
  • PGnome sequencing panels can be ordered via the myPrevent portal only at this time.

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 Method (Backbone)


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.

Note: acceptable specimen types are whole blood and DNA from whole blood only.
Total Price: $
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