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Test Code
5414
Test Name
Popliteal Pterygium Syndrome NGS Panel
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
PPS
Description

Popliteal pterygium syndrome (PPS; MIM 119500) is an autosomal dominant disorder characterized by popliteal pterygium, cleft lip and/or palate, lip pits, and digital and genital abnormalities. It is caused by mutations in the IRF6 gene, which codes for interferon regulatory factor 6. IRF6 mutations can also cause van der Woude syndrome (VWS1; MIM 119300), which shares some clinical features of PPS. An autosomal recessive form of PPS, popliteal pterygium syndrome, lethal type (MIM 263650) also known as Bartsocas-Papas syndrome, is more severe than the autosomal dominant form. The main findings include multiple popliteal pterygia leading to arthrogryposis, synostosis of the carpal/tarsal and phalangeal bones in the hands and feet, digital hypoplasia/aplasia, syndactyly, absent nails, genital abnormalities, microphthalmia, absent eyebrows and eyelashes, ankyloblepharon, hypoplastic nose, filiform bands between the jaws and orofacial clefts. It is usually lethal neonatally or in early infancy. This form is caused by mutations in the RIPK4 gene, which codes for receptor-interacting serine/threonine-protein kinase 4.

The popliteal pterygium syndrome NGS panel consists of two genes: IRF6 and RIPK4.
Testing Schedule
Monday-Friday
Genes
IRF6, RIPK4
Disease Group
Craniosynostosis and Craniofacial Disorders, Dysmorphology, Hair and Nail disorders
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
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