Coffin-Lowry syndrome : RPS6KA3 Sequencing

Test Information

RPS6KA3 sequencing is a molecular test used to identify variants in the gene associated with Coffin-Lowry syndrome.

Turnaround Time

6 weeks

CPT Code(s)

81479

Cost

$1,500

Genes

Clinical Information

Coffin-Lowry syndrome is an X-linked intellectual disability condition caused by mutations in the protein kinase gene, RPS6KA3, localized to Xp22. Males present with moderate to severe developmental delay, coarse facies, large soft hands with short tapering fingers, hypotonia, joint hyperextensibility and skeletal changes. Carrier females have mild intellectual impairment and short stature, coarse face, prominent lips, soft fleshy hands with thick tapering fingers. Decreased levels of ribosomal S6 kinase activity can be observed in white cells but usually only after establishing a cell line.

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

Detection

A mutation in RPS6KA3 will be indentified in approximately 90-95% of patients with Coffin-Lowry syndrome.

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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