Classic view of this page
UGT1A1 genotyping for Gilbert Syndrome
GTR Test Accession: Help GTR000018449.3
CAP
INHERITED DISEASEMETABOLIC DISEASESYNDROMIC DISEASE ... View more
Last updated in GTR: 2020-08-13
View version history GTR000018449.3, last updated: 2020-08-13 GTR000018449.2, last updated: 2019-08-13 GTR000018449.1, last updated: 2018-08-20
Last annual review date for the lab: 2023-07-18 LinkOut
On this page
At a Glance
Ordering Information
Conditions
Test Targets
Methodologies
Clinical Information
Technical Information
Regulatory Approval
Additional Information
At a Glance
Test purpose: Help
Diagnosis; Monitoring; Mutation Confirmation; ...
Conditions (1): Help
Gilbert syndrome
Genes (1): Help
UGT1A1 (2q37.1)
Methods (1): Help
Molecular Genetics - Targeted variant analysis: PCR electrophoresis, capillary gel
Target population:Help
The target population is patients suspected of having a diagnosis …
Clinical validity: Help
Individuals with Gilbert syndrome have a reduced level of hepatic …
Clinical utility: Help
Not provided
Ordering Information
Offered by: Help
Genetic Services Laboratory
View lab's website
View lab's test page
Specimen Source: Help
- Amniocytes
- Amniotic fluid
- Buccal swab
- Cell culture
- Chorionic villi
- Cord blood
- Fetal blood
- Fibroblasts
- Frozen tissue
- Isolated DNA
- Peripheral (whole) blood
- Product of conception (POC)
- Saliva
- View specimen requirements
Who can order: Help
- Genetic Counselor
- Health Care Provider
- Licensed Physician
- Nurse Practitioner
- Physician Assistant
- Registered Nurse
CPT codes: Help
Contact Policy: Help
Laboratory can only accept contact from health care providers. Patients/families are encouraged to discuss genetic testing options with their health care provider.
How to Order: Help
All samples should be shipped via overnight delivery at room temperature.
No weekend or holiday deliveries.
Label each specimen with the patient’s name, date of birth and date sample collected.
Send specimens with complete requisition and consent form, otherwise, specimen processing may be delayed.
Test service: Help
Clinical Testing/Confirmation of Mutations Identified Previously
Confirmation of research findings
Custom Sequence Analysis
Test development: Help
Test developed by laboratory (no manufacturer test name)
Informed consent required: Help
No
Pre-test genetic counseling required: Help
Decline to answer
Post-test genetic counseling required: Help
Decline to answer
Recommended fields not provided:
Test Order Code, Lab contact for this test, Test strategy
Conditions Help
Total conditions: 1
| Condition/Phenotype | Identifier |
|---|
Test Targets
Genes Help
Total genes: 1
| Gene | Associated Condition | Germline or Somatic | Allele (Lab-provided) | Variant in NCBI |
|---|
Methodology
Total methods: 1
Method Category Help
Test method Help
Instrument *
Targeted variant analysis
PCR electrophoresis, capillary gel
* Instrument: Not provided
Clinical Information
Test purpose: Help
Diagnosis; Monitoring; Mutation Confirmation; Pre-symptomatic; Risk Assessment; Screening
Clinical validity: Help
Individuals with Gilbert syndrome have a reduced level of hepatic bilirubin UDP-glucuronosyltransferase 1A1 (UGT1A1), the enzyme necessary for the conjugation of bilirubin. This enzyme is encoded for by the UGT1A1 gene on chromosome 2q37. A polymorphism in the promoter region of the UGT1A1 gene has been identified in the majority … View more
- Characterization of Nigerian strains of West Nile virus by plaque formation. Odelola HA, et al. Acta Virol. 1975;19(6):489-92. doi:10.1128/iai.12.5.1104-1111.1975. PMID: 1. Bosma et al. “The genetic basis of the reduced expression of bilirubin UDP-glucuronosyltransferase 1 in Gilbert's syndrome”. (1995) New Engl. J. Med. 333: 1171-1175. 2. Monaghan et al. “Genetic variation in bilirubin UPD-glucuronosyltransferase gene promoter and Gilbert's syndrome”. (1996) Lancet. 347: 578-581. 3. Akaba et al. “Neonatal hyperbilirubinemia and a common mutation of the bilirubin uridine diphosphate-glucuronosyltransferase gene in Japanese”. (1999) J Hum Genet 44(1): 22-5. 4. Iyer et al. “UGT1A1*28 polymorphism as a determinant of irinotecan disposition and toxicity”. (2002) Pharmacogenomics J. 2:43-47. 5. Innocenti et al. “Genetic variants in the UDP-glucuronosyltransferase 1A1 gene predict the risk of severe neutropenia of irinotecan”. (2004) J. Clin. Oncol. 22:1382-1388..
Target population: Help
The target population is patients suspected of having a diagnosis of Gilbert's syndrome.
Variant Interpretation:
What is the protocol for interpreting a variation as a VUS? Help
Variants will be identified and evaluated using a custom collection of bioinformatic tools and comprehensively interpreted by our team of directors and genetic counselors.
Will the lab re-contact the ordering physician if variant interpretation changes? Help
Yes.
Research:
Is research allowed on the sample after clinical testing is complete? Help
http://dnatesting.uchicago.edu/research-consent-form
Recommended fields not provided:
Clinical utility, Are family members with defined clinical status recruited to assess significance of VUS without charge?, Sample negative report, Sample positive report
Technical Information
Test Comments: Help
UGT1A1*28 (promoter polymorphism) and *6 (G71R) polymorphisms are tested for Gilbert syndrome and only the UGT1A*28 polymorphism is tested for irinotecan metabolism.
Availability: Help
Tests performed
Entire test performed in-house
Analytical Validity: Help
Analytical Sensitivity 99-100% Accuracy 100% Precision 100%
Proficiency testing (PT):
Is proficiency testing performed for this test? Help
Yes
Method used for proficiency testing: Help
Formal PT program
PT Provider: Help
American College of Medical Genetics / College of American Pathologists, ACMG/CAP
VUS:
Software used to interpret novel variations Help
A custom collection of bioinformatics tools
Laboratory's policy on reporting novel variations Help
The laboratory reports novel variations.
Recommended fields not provided:
Test Confirmation, Assay limitations, Description of internal test validation method, Citations for Analytical validity, Description of PT method, Major CAP category, CAP category, CAP test list
Regulatory Approval
FDA Review: Help
Category: FDA exercises enforcement discretion
Additional Information
Reviews:
PubMed Clinical Queries
Reviews in PubMed
Clinical resources:
Molecular resources:
Consumer resources:
IMPORTANT NOTE: NIH does not independently verify information submitted to GTR; it relies on submitters to provide information that is accurate and not misleading. NIH makes no endorsem*nts of tests or laboratories listed in GTR. GTR is not a substitute for medical advice. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.
