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Heterotaxy and Conotruncal Heart Defects via the GDF1 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
8875 GDF1 81479 81479,81479 $890 Order Options and Pricing
Test Code Test Copy Genes Test CPT Code Gene CPT Codes Copy CPT Code Base Price
8875GDF181479 81479(x2) $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.

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

Click here for costs to reflex to whole PGxome (if original test is on PGxome Sequencing backbone).

Click here for costs to reflex to whole PGnome (if original test is on PGnome Sequencing backbone).

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

For Sanger Sequencing click here.

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

  • Fang Xu, PhD, FACMG

Clinical Features and Genetics

Clinical Features

Heterotaxy syndrome or situs ambiguus results from a failure to properly establish left-right asymmetry during embryogenesis resulting in an abnormal arrangement of thoracic or abdominal visceral organs, including the heart, lungs, liver, spleen, intestines, and stomach. Affected patients frequently have significant morbidity and mortality due to a wide variety of cyanotic congenital heart defects. Common defects besides cardiac malformations include asplenia or polysplenia, left-sided liver, right-sided stomach, gastrointestinal malrotation, and altered lung lobation. Classic heterotaxy (cardiac malformations and visceral laterality defects) has an estimated prevalence of 1:10,000 live births (Lin et al. Genet Med 2:157-172, 2000).

Genetics

Heterotaxy is a heterogeneous genetic disorder. Variants in at least 7 genes (NODAL, ZIC3, CFC1, FOXH1, LEFTY2, GDF1, and ACVR2B) involved in NODAL signaling have been proposed to cause heterotaxy or congenital heart defects (CHDs). These proteins play an essential role in establishing left-right patterning during organogenesis, including the heart and great vessels (reviewed by Hamada et al. Nat Rev Genet 3:103-113, 2002). Defects in NODAL signaling factors are also found in 5-10% of patients with isolated CHDs without heterotaxy, including tetralogy of Fallot (TOF), double outlet right ventricle (DORV), transposition of the great arteries (TGA), and cardiac septal defects (Roessler et al. Am J Hum Genet 83:18-29, 2008; Mohapatra et al. Hum Mol Genet 18:861-871, 2009). GDF1 (growth differentiation factor 1; OMIM 602880) encodes a NODAL-related signaling molecule that is important for left-right patterning of the heart (Rankin et al. Nat Genet 24:262-265, 2000). Heterozygous nonsense and missense variants in GDF1 were identified in individuals with conotruncal heart defects (TOF, DORV, TGA) without visceral laterality defects (Karkera et al. Am J Hum Genet 81:987-994, 2007). Two truncating variants in GDF1 were found to cause classic heterotaxy in one Finnish family with heterozygous carriers being asymptomatic (Kaasinen et al. Hum Mol Genet 19:2747-2753, 2010).

Clinical Sensitivity - Sequencing with CNV PGxome

Variants in the GDF1 gene are estimated to cause ~2% of all cases of CHD (Karkera et al. Am J Hum Genet 81:987-994, 2007).

Testing Strategy

This test provides full coverage of all coding exons of the GDF1 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. PGnome panels typically provide slightly increased coverage over the PGxome equivalent. PGnome sequencing panels have the added benefit of additional analysis and reporting of deep intronic regions (where applicable).

Dependent on the sequencing backbone selected for this testing, discounted reflex testing to any other similar backbone-based test is available (i.e., PGxome panel to whole PGxome; PGnome panel to whole PGnome).

Indications for Test

All patients with heterotaxic phenotypes are candidates for this test. Patients with isolated CHDs without visceral laterality defects are also candidates for this test.

Gene

Official Gene Symbol OMIM ID
GDF1 602880
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT

Related Tests

Name
Comprehensive Cardiology Panel
Isolated Nonsyndromic Congenital Heart Defects via the NKX2-5 Gene
Isolated Nonsyndromic Congenital Heart Defects via the ZFPM2 (FOG2) Gene

Citations

  • Hamada, H., et.al. (2002). "Establishment of vertebrate left-right asymmetry." Nat Rev Genet 3(2): 103-13. PubMed ID: 11836504
  • Kaasinen E, Aittomaki K, Eronen M, Vahteristo P, Karhu A, Mecklin J-P, Kajantie E, Aaltonen LA, Lehtonen R. 2010. Recessively inherited right atrial isomerism caused by mutations in growth/differentiation factor 1 (GDF1). Human Molecular Genetics 19: 2747–2753. PubMed ID: 20413652
  • Karkera JD, Lee JS, Roessler E, Banerjee-Basu S, Ouspenskaia MV, Mez J, Goldmuntz E, Bowers P, Towbin J, Belmont JW, Baxevanis AD, Schier AF, et al. 2007. Loss-of-Function Mutations in Growth Differentiation Factor-1 (GDF1) Are Associated with Congenital Heart Defects in Humans. The American Journal of Human Genetics 81: 987–994. PubMed ID: 17924340
  • Lin AE, Ticho BS, Houde K, Westgate MN, Holmes LB. 2000. Heterotaxy: associated conditions and hospital-based prevalence in newborns. Genet. Med. 2: 157–172. PubMed ID: 11256661
  • Mohapatra, B., et.al. (2009). "Identification and functional characterization of NODAL rare variants in heterotaxy and isolated cardiovascular malformations." Hum Mol Genet 18(5): 861-71. PubMed ID: 19064609
  • Rankin et al. Nat Genet 24:262-265, 2000
  • Roessler, E., et.al. (2008). "Reduced NODAL signaling strength via mutation of several pathway members including FOXH1 is linked to human heart defects and holoprosencephaly." Am J Hum Genet 83(1): 18-29. PubMed ID: 18538293

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

PGxome (Exome) Sequencing Panel

PGnome (Genome) Sequencing Panel

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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.
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