FBN1 gDNA Testing

Genes

FBN1

Test Guide

Mutations in FBN1 can result in several phenotypes, the most frequent of which is Marfan syndrome that is characterized by relative tall stature, arachnodactyly, kyphoscoliosis, chest deformity, lens dislocation and a high risk for aortic aneurysm and dissection. In addition to Marfan syndrome mutations in FBN1 can cause dominantly inherited forms of geleophysic dysplasiaacromicric dysplasiaWeill Marchesani syndrome, and stiff skin syndrome.

Please consult our Familial Aneurysm Test Guide to learn more about when to test for mutations in FBN1.

Methodology

Next Generation Sequencing:  Next generation DNA sequencing is performed to identify nucleotide variants in the coding portion of the genome. All nucleotides in the coding exons and their flanking splice junctions are sequenced to a read coverage of greater than 20X.  The sequence data are assembled and compared to the published genomic reference sequence.  Sanger sequencing is performed if necessary to ensure complete nucleotide coverage of the target sequence and to confirm all reported variants.  Human Genome Variation Society (HGVS) recommendations are followed for variant nomenclature and ACMGG/AMP variant interpretation guidelines are followed to assess variant pathogenicity, unless otherwise indicated.  The following online databases and in silico analysis tools are routinely used for variant investigation: ClinVar, NHLBI Exome Sequencing Project, 1000 Genomes, dbSNP, Exome Aggregation Consortium (ExAC), available loci specific variant databases, PolyPhen-2, SIFT, Provean, Mutation Taster and Human Splicing Finder.

Specimen Requirements

BLOOD IS PREFERRED.

BLOOD:
2 EDTA (purple top) tubes
Adults: 5-10cc
Children: 3-5cc
Infants: 2-3cc

Whole blood may be stored up to 5-7 days in the refrigerator before shipping.

DNA:
5 µg DNA at a minimum concentration of ≥200 ng/µl

SALIVA:
Oragene Saliva samples are accepted

Special Instructions

Blood samples (or DNA) should be well labeled with patient’s full name and an identifying number.

Ship sample at room temperature with overnight delivery.

Clinical information outlining the indication for the requested tests and pertinent medical history and family history is a necessary component of testing. Please include a clinic note when available.

CPT Code & Cost

81408
$1300

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University of Washington, UW Medicine Pathology.