In This Section      
 

CraniofacialZoom

Genes:
See test page
Genes: ALPL, ALX1, ALX3, ALX4, CDC45, CYP26B1, DHODH, EFNB1, EFTUD2, ERF, FBN1, FGFR1, FGFR2, FGFR3, FREM1, GLI3, IFT122, IFT43, IHH, IL11RA, KRAS, MASP1, MEGF8, MSX2, P4HB, PHF6, PHF8, POLR1C, POLR1D, POR, RAB23, RECQL4, RSPRY1, SEC24D, SKI, TCF12, TCOF1, TGFBR1, TGFBR2, TMCO1, TWIST1, WDR19, WDR35, ZIC1, ZSWIM6

Test Information

Test Method

DNA extraction (if applicable) and ultrasonic fragmentation; targeted capture of the coding regions and intron/exon boundaries of protein coding RefSeq genes using a TWIST custom exome library capture; next generation sequencing (NGS) on an Illumina NovaSeq instrument; alignment to the human reference genome (GRCh37/hg19) using the Burrows-Wheeler Aligner (bwa); variant calling using GATK and detection of exonic deletions and duplications using ExomeDepth; Sanger sequencing to confirm low quality and/or complex indel variants related to the specified phenotype(s); Review of sequence and dosage data for the specified genes by multiple staff members; Variant classification following ACMG criteria (if applicable). Bioinformatic analysis was performed using DDL pipeline DDL.TWISTExome.v1.2020_12_22 and DDL.TWIST.Exome.Dosage.v1.2020_12_20.

 

Clinical Utility

Discrimination between multiple heritable disorders associated with craniofacial conditions; identification of causative mutations in complex cases that span multiple phenotypes; facilitation of targeted carrier testing of relatives of proband and/or predictive prenatal testing.

Clinical Sensitivity

The detection rate for the CraniofacialZoom panel is undetermined at this point, due to ongoing research in the field.

 
 

Analytic Sensitivity

Sequencing: >94% for single nucleotide and >76% for small insertion/deletion variants for the nucleotides evaluated. Exonic deletions/duplications: >97% for unique regions of the genome. This test is not validated to identify small deletions/insertions of greater than 20bp, exonic deletions and duplications in pseudogenes or other repetitive regions of the genome (e.g. segmental duplications), nucleotide repeat expansions, mitochondrial DNA variants or mosaicism. Disease-associated variants in regions that are not captured and/or sufficiently sequenced will not be detected by this assay.

 
 

Sample Requirements

3-6ml whole blood in EDTA (purple topped) tubes
Saliva collected in an appropriate collection device (Oragene®-DNA 500 or 600 device)
DNA extracted from fibroblast or lymphocyte cell line (must be extracted in a CLIA-certified laboratory)

 
 

Turn Around Time

6-8 weeks

Fee and CPT Codes

Exome Panel: $2915
CPT Code: 81479
*If you are a provider outside of Johns Hopkins we are only accepting institutional billing