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Test Code PENDRED SEQ Pendred Sequencing

Clinical System Name

Pendred Sequencing

Synonyms

SLC26A4 Sequencing

DFNB4

Description

Sequencing analysis of the Solute Carrier Family 26, Member 4 (SLC26A4) gene.

Sample Requirements

Specimen: Whole blood, cord blood

Container(s): Lavender/EDTA, Yellow/ACD A or B

Preferred Vol: 3 mL

Minimum Vol: 1 mL

 

Note: Heparin samples (Green tops) are unacceptable.

 

Specimen: Extracted DNA

Minimum: 10µg

Note: DNA concentration minimum 50 µg/mL; 260/280 ratio 1.70-2.00

  

Specimen: Cultured cells

Acceptable:  Fibroblasts

Container(s): T-25 flasks

Preferred Vol: 2 flasks

Processing Instructions

Reject due to: Heparin

Spin: No

Aliquot: No

Temp: Refrigerate

Storage location: Molecular Genetics box in CPA refrigerator #2

 

Off-site collection: Refrigerate blood samples until ready to ship.  Transport all sample types at room temperature via overnight shipping.

Stability

Specimen Type Temperature Time
Cultured cells Room temp 3 days
Whole blood, extracted DNA Room temp 3-5 days
Whole blood, extracted DNA Refrigerated 7 days
Extracted DNA Frozen ok

 

Note: Whole blood samples > 7days may be submitted to be assessed by our lab for acceptability for testing.

Availability

STAT Performed TAT
Contact lab Monday - Friday 2-3 weeks

 

Performing Laboratory

Seattle Children's Laboratory

Department

Department:  Molecular Genetics Laboratory

Phone: 206-987-3872

 

Lab Client Services: 206-987-2617

 

Lab Genetic Counselor: LabGC@seattlechildrens.org

Reference Range

Interpretive report will be provided

Methodology

Method: Bi-directional sequencing of all exons and exon-intron boundaries

 

Limitations: Mutations in the promoter region, large deletions, large duplications, or rare recombinant mutations may not be detected by this method.

CPT Codes

81406 (updated 1/20/16 by jconta)

Special Instructions

Links to: Pendred Syndrome/DFNB4 - GeneReview

Requisition

Molecular Genetics

Clinical Utility

Mutations in the SLC26A4 gene cause Pendred syndrome (PDS) and DFNB4. Pendred syndrome is an autosomal recessive syndromic disorder characterized by bilateral sensorineural hearing impairment (typically congenital), vestibular dysfunction, temporal bone abnormalities such as enlargement of the vestibular aqueduct (EVA), and euthyroid goiter. DFNB4 is an autosomal recessive form of nonsyndromic deafness characterized by vestibular dysfunction and EVA without thyroid defects. SLC26A4 mutations may account for 7-13% of all congenital hearing impairment.  SLC26A4 mutations account for approximately half of PDS/DFNB4 cases and are the second most common cause of genetic hearing impairment. Deletion/duplication analysis of SLC26A4 and analysis of the FOXI1 and KCNJ10 genes could be considered for individuals with a clinical history suggestive of Pendred syndrome/DFNB4 and one or no identifiable mutations in the SLC26A4 gene.