Alpha-Thalassemia X-linked Intellectual Disability (ATR-X) Sequencing

Disorder Alpha-thalassemia X-linked Intellectual Disability
Gene Name ATRX
Clinical info Alpha-thalassemia X-linked Intellectual Disbility (ATR-X) is an XLID condition caused by mutations in the ATRX/XNP gene localized to Xq13. Males usually present with moderate intellectual disability and characteristic hypotonic facies, consisting of small head size, depressed nasal bridge, large open mouth, large prominent lips and an inverted upper lip. Carrier females exhibit no features, a result of highly skewed X-inactivation. Males can sometimes exhibit hemoglobin H inclusion bodies but this clinical test is unreliable for diagnosis purposes.
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.
Detection Sequencing of ATR-X will detect a mutation in 95% of individuals with this disorder.
Specimen Requirements 5 to 10 ml of peripheral blood collected in an EDTA (lavender top) Vacutainer tube is preferred.  The minimal blood needed for reliable DNA isolation is 3 ml.
Transport The specimen should be kept at room temperature and delivered via overnight shipping. FedEx is preferred. If shipment is delayed by one or two days, the specimen should be refrigerated and shipped at room temperature. Do not freeze the specimen.
Turnaround time 6 weeks
Prenatal testing Prenatal diagnosis is available if the familial mutation is 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.
CPT Codes Unknown mutation: 81479

Known mutation: 81404

Deletion/Duplicaton Analysis: 81229
Cost

$2200 for sequencing

$350 for known mutation

$700 for deletion/duplication analysis

$1000 for prenatal known mutation analysis

Contact For further information contact This email address is being protected from spambots. You need JavaScript enabled to view it. , MS, Lab Counselor at 1-800-473-9411.

Molecular Diagnostic Lab

The Molecular Diagnostic Lab offers DNA analysis for many genetic disorders via gene sequencing, targeted mutation analysis, MLPA deletion/duplication testing, trinucleotide repeat analysis and next generation sequencing panels.

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