Schaaf-Yang syndrome : MAGEL2 Sequencing

Test Information

MAGEL2 sequencing is a molecular test used to identify variants in the gene associated with Schaaf-Yang syndrome.

Turnaround Time

3 weeks

CPT Code(s)

81403

Cost

$350

Genes

Clinical Information

Schaaf-Yang syndrome has clinical features similar to Prader-Willi syndrome including neonatal hypotonia with failure to thrive which transitions into excessive eating and subsequent obesity. Developmental delays and intellectual disabilities are common, and some patients exhibit autistic features. Physical characteristics include hypogonadism, short stature, small hands, almond shaped eyes, and coarse features. Seizures occur in some patients. Schaaf-Yang syndrome appears to be caused by de novo mutations in MAGEL2.

Indications

Molecular testing is useful to confirm the diagnosis and to identify the disease causing mutations within a family to allow for carrier testing and prenatal diagnosis.

Methodology

Sanger Sequencing

Specimen Requirements

5 to 7 ml of peripheral blood collected in an EDTA (lavender top) tube is the preferred specimen type. The minimal blood needed for reliable DNA isolation is 3 ml. Extracted DNA, dried blood spots, and saliva are also accepted for this test.

Transport Instructions

The specimen should be kept at room temperature and delivered via overnight shipping. If shipment is delayed by one or two days, the specimen should be refrigerated and shipped at room temperature. Do not freeze the specimen. Samples collected on Friday can be safely designated for Monday delivery.

Prenatal Testing Information

Prenatal diagnosis is available if the familial mutations are known. Additional fees for cell culture and maternal cell contamination may apply. Maternal cell contamination studies are required for all prenatal molecular tests. Contact the laboratory prior to sending a prenatal specimen.

Have Questions Need Support?

Call our laboratory at 1-800-473-9411 or contact one of our Laboratory Genetic Counselors for assistance.
Robin Fletcher, MS, CGC
Kellie Walden, MS, CGC

Molecular Testing, Sanger Sequencing
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