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GLI3-Related Disorders (GLI3) Sequencing
2011470
Ordering Recommendation

Appropriate first-tier test to confirm a clinical diagnosis of Pallister-Hall syndrome or Greig cephalopolysyndactyly syndrome.

Mnemonic
GLI3 FGS
Methodology
Polymerase Chain Reaction/Sequencing
Performed
Sun- Sat
Reported
14-21 days
New York DOH Approval Status
Specimens from New York clients will be sent out to a New York DOH approved laboratory, if possible.
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
 
Collect
Lavender (EDTA), pink (K2EDTA), or Yellow (ACD Solution A or B). 
Specimen Preparation
Transport 3 mL whole blood. (Min: 1 mL) 
Storage/Transport Temperature
Refrigerated. 
Unacceptable Conditions
 
Remarks
 
Stability
Ambient: 72 hours; Refrigerated: 1 week; Frozen: Unacceptable 
Reference Interval
Interpretive Data
Background Information for GLI3-Related Disorders (GLI3) Sequencing:
Characteristics
: Mutations in the GLI3 gene cause multiple disorders. The most common disorders are Pallister-Hall syndrome (PHS) and Greig Cephalopolysyndactyly syndrome (GCPS).
PHS
is characterized by hypothalamic hamartoma, postaxial/central polydactyly, and bifid epiglottis. Some individuals may exhibit imperforate anus, renal, genitourinary, pulmonary, or non-polydactyly skeletal anomalies.
GCPS
is characterized by preaxial polysyndactyly, hypertelorism, and macrocephaly. Severe cases may exhibit seizures, hydrocephalus, and/or intellectual disability.
Inheritance
: Autosomal dominant
Cause
: Pathogenic germline mutations in the GLI3 gene.
Clinical sensitivity:
PHS-90 percent; GCPS-70 percent
Methodology
: Bidirectional sequencing of the entire coding region and intron/exon boundaries of the GLI3 gene.
Analytical sensitivity and specificity
: Greater than 99 percent for sequencing.
Limitations
: Diagnostic errors can occur due to rare sequence variations. Regulatory region mutations, deep intronic mutations, and large deletions/duplications are not detected. Exon 1 is a non-coding region and not covered by this assay. Mutations in genes other than GLI3 are not detected.

Counseling and informed consent are recommended for genetic testing. Consent forms are available online at www.aruplab.com.

Compliance Statement C: The performance characteristics of this test were validated by ARUP Laboratories. The U.S. Food and Drug Administration (FDA) has not approved or cleared this test. However, FDA approval or clearance is currently not required for clinical use of this test. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions. ARUP is authorized under Clinical Laboratory Improvement Amendments (CLIA) and by all states to perform high-complexity testing. Counseling and informed consent are recommended for genetic testing. Consent forms are available online.

Components
Component Test Code*Component Chart NameLOINC
2011471GLI3 Sequencing - Specimen31208-2
2011472GLI3 Sequencing - Interpretation35474-6
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • Greig Cephalopolysyndactyly syndrome (GCPS)
  • Pallister-Hall syndrome (PHS)
  • polydactyly