STRC-Related Disorders: STRC Deletion/Duplication MLPA

Test Information

STRC Deletion/Duplication MLPA is a molecular test used to detect copy number variants in the gene associated with STRC-related disorders including type 16 autosomal recessive deafness.

Turnaround Time

2 weeks

CPT Code(s)

81479

Cost

$500

Genes

  • STRC

Clinical Information

Pathogenic variants in STRC are associated with type 16 autosomal recessive deafness (DFNB16), a nonsyndromic hearing loss, with prelingual onset. DFNB16 is caused by homozygous or compound heterozygous mutations, multi-exon or complete STRC deletions, or gene conversion between the STRC gene and the STRC pseudogene (STRCP1).

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

multiplex ligation-dependent probe amplification (MLPA)

Detection

Alterations in the stereocilin (STRC) gene are the most common genetic etiology in patients with mild to moderate hearing loss, accounting for roughly 30% of patients in this group, and 16% among all patients with hearing loss. Most variants were large copy number variants (CNVs).

Specimen Requirements

The preferred sample type is 3-5 ml of peripheral blood collected in an EDTA (purple top) tube. Extracted DNA and saliva are also accepted for this test. Saliva samples must be submitted in an approved saliva kit. Contact the lab to receive a saliva kit or to have one sent to your patient.

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.

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
Falecia Thomas, MS, CGC

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