Neuronal Ceroid Lipofuscinosis Type 3, Batten Disease : CLN3 Sequencing

Test Information

CLN3 sequencing is a molecular test used to identify variants in the gene associated with Neuronal Ceroid Lipofuscinosis Type 3, Batten Disease.

Turnaround Time

3 weeks

CPT Code(s)

81479

Cost

$1,000

Genes

Clinical Information

Batten disease is an autosomal recessive neurodegenerative lysosomal storage disorder, specifically one of the neuronal ceroid-lipofuscinoses (NCLs). The neuronal ceroid-lipofuscinoses are a genetically heterogenous group of disorders characterized by progressive cognitive and motor deterioration, seizures, and early death.
Batten disease is one of the most common of the NCLs with the classic juvenile onset of symptoms between ages 4 and 8 years. Vision impairment is typically the first symptom and progresses rapidly to severe vision loss. Onset of seizures between ages 9 and 18 is consistent among patients. However, the progression of cognitive and motor deterioration is variable with psychiatric symptoms, behavior problems, and sleep disturbances developing later. Individuals with Batten disease do not usually live past their early 20s.

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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