Neurofibromatosis 2

Neurofibromatosis 2 (NF2) is characterized by benign tumors on the nerve that carries sound and balance information from the inner ear to the brain (the eighth cranial nerve). These tumors affect both ears, often leading to partial or complete hearing loss. People with NF2 may also develop other types of benign brain or spinal tumors. 

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Test Code 9024
Turnaround Time (TAT) 14-21 days
Number of Genes 1
Specimen Requirements Click here

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Mutation Detection Rate

This test can detect >99.9% of described mutations in NF2, when present (analytic sensitivity).

Test Description

NF2 coding exons and well into the 5’ and 3’ ends of all the introns and untranslated regions are analyzed by sequencing. Gross deletion/duplication analysis determines gene copy number for coding exons. Clinically significant intronic findings beyond 5 base pairs are always reported. Intronic variants of unknown or unlikely clinical significance are not reported beyond 5 base pairs from the splice junction. Genomic deoxyribonucleic acid (gDNA) is isolated from the patient’s specimen using standardized methodology and quantified. Sequence enrichment of the targeted coding exons and adjacent intronic nucleotides is carried out by a bait-capture methodology, using long biotinylated oligonucleotide probes followed by polymerase chain reaction (PCR) and next generation sequencing (NGS). Sanger sequencing is performed for any regions missing or with insufficient read depth coverage for reliable heterozygous variant detection. Reportable small insertions and deletions, potentially homozygous variants, variants in regions complicated by pseudogene interference, and single nucleotide variant calls not satisfying 100x depth of coverage and 40% het ratio thresholds are verified by Sanger sequencing. Gross deletion/duplication analysis of NF2 using the multiplex ligation-dependent probe amplification (MLPA) kit is also performed.

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