Test Directory

Test Code
1510
Test Name
Cranioectodermal Dysplasia 4
CPT Codes
81479
Expected Turnaround Time
Typically 2 to 4 weeks from receipt of a sample in the laboratory. All cases involving ongoing pregnancies will be expedited.
Clinical Utility
Genetic analysis to provide a molecular diagnosis of this disorder. Recommended for individuals with a personal and/or family history of this disorder to ensure appropriate treatment and establish recurrence risk for family members.
Specimen and Container Info

Non-Prenatal Specimens

Preferred/Alternate

Specimen Type

Containers

Volume

Preferred Specimen Type

Whole Blood

Lavender Top (EDTA)

3 mL

Alternate Specimen Type

Genomic DNA

1.5 mL Tube

3 µg (at a concentration of at least 30 ng/µl), preferably in TE solution.

Alternate Specimen Type

Fibroblasts

T-25 Flasks

2 confluent T-25 flasks, filled to capacity

Alternate Specimen Type

Saliva (Whole blood is recommended for CNV)

DNA Self-Collection Kit or Oragene Saliva Collection Kit for Young Children

Follow kit instructions (www.dnagenotek.com)

Prenatal Specimens

Either specimen type below is acceptable.

Specimen Type

Containers

Volume

Cultured cells

T-25 Flasks

2 confluent T-25 flasks derived from amnio or CVS samples.

Genomic DNA

1.5 mL Tube

3 µg (at a concentration of at least 30 ng/µl), preferably in TE solution.

NOTE: For specimens from outside of North America, the preferred specimen type is Genomic DNA. HNL Genomics does not recommend shipping whole blood or cultured cells from any location other than the United States, Canada, or Mexico.

Transport Instructions
  • Transport at room temperature within 24 hours.
  • If the specimen cannot be transported to the lab within 24 hours, refrigerate for up to 72 hours.
  • Do not freeze or expose to extreme temperatures, refrigerate for up to 72 hours if cannot be transported to lab within 24 hours. 
Stability Requirements

Room Temperature

24 hours

Refrigerated

72 hours

Causes for Rejection
  • Improperly labeled specimen (minimum of two patient identifiers)
  • Inappropriate specimen type
  • Incomplete or incorrect test request form
  • Insufficient volume
  • Specimen has leaked in transit
  • Specimen without a test order
Methodology
Next Generation Sequencing and Copy Number Variation Analysis
Performing Location
Genomics - Snowdrift
Alternate Names
CED
Description

Cranioectodermal dysplasia (CED) is an autosomal recessive ciliopathy characterized by sagittal craniosynostosis, skeletal, facial and ectodermal abnormalities. Findings typically include: dolichocephaly, hypertelorism, frontal and occipital bossing, telecanthus, epicanthal folds or narrow palpebral fissures, retinitis pigmentosa, low set ears, everted lower lip, fine sparse hair, dental abnormalities consisting of hypoplastic, widely spaced or fused teeth, short limbs, brachydactyly, narrow chest with short ribs, and skin laxity. Some patients have been reported with renal failure due to nephronophthisis or hepatic failure. CED is also known as Sensenbrenner syndrome. CED is known to be caused by mutations in at least four genes, IFT122, WDR35, IFT43 and WDR19. Mutations in IFT122 cause CED1 (MIM 218330), while mutations in WDR35, IFT43 and WDR19 cause CED2 (MIM 613610), CED3 (MIM 614099) and CED4 (MIM 614378), respectively. The products of these genes are components of cilia. Autosomal recessive mutations in WDR35 also cause short rib-polydactyly syndrome, type V (SRPS5; MIM 614091), and mutations in WDR19 cause asphyxiating thoracic dystrophy 5 (ATD5; MIM 614376), disorders sharing many phenotypic findings with CED and other ciliopathies.

Testing Schedule
Monday-Friday
Genes
WDR19
MIM
614378
Disease Group
Craniosynostosis and Craniofacial Disorders, Skeletal Disorders