TTR Gene, Full Gene Analysis
GTR Test Accession: Help GTR000593144.2
CAP
INHERITED DISEASEMETABOLIC DISEASENERVOUS SYSTEM ... View more
Last updated in GTR: 2022-12-12
Last annual review date for the lab: 2023-05-30 LinkOut
At a Glance
Diagnosis; Mutation Confirmation; Pre-symptomatic
Familial amyloid neuropathy
Genes (1): Help
TTR (18q12.1)
Molecular Genetics - Deletion/duplication analysis: Next-Generation (NGS)/Massively parallel sequencing (MPS); ...
Adult individuals with clinical features of transthyretin-associated familial amyloidosis
Not provided
Establish or confirm diagnosis; Guidance for management
Ordering Information
Offered by: Help
Test short name: Help
TTRZ
Specimen Source: Help
Who can order: Help
  • Genetic Counselor
  • Health Care Provider
  • Licensed Dentist
  • Licensed Physician
  • Nurse Practitioner
  • Physician Assistant
  • Public Health Mandate
  • Registered Nurse
Lab contact: Help
Emily Lauer, MS, CGC, Certified Genetic counselor, CGC, Genetic Counselor
gcmolgen@mayo.edu
1-800-533-1710
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
https://www.mayocliniclabs.com/test-catalog/Overview/617753#Specimen
Order URL
Test service: Help
Clinical Testing/Confirmation of Mutations Identified Previously
    Comment: FMTT
    OrderCode: FMTT
Test development: Help
Test developed by laboratory (no manufacturer test name)
Informed consent required: Help
Based on applicable state law
Pre-test genetic counseling required: Help
No
Post-test genetic counseling required: Help
No
Recommended fields not provided:
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: 2
Method Category Help
Test method Help
Instrument
Deletion/duplication analysis
Next-Generation (NGS)/Massively parallel sequencing (MPS)
Other
Sequence analysis of the entire coding region
Next-Generation (NGS)/Massively parallel sequencing (MPS)
Illumina NovaSeq 6000
Clinical Information
Test purpose: Help
Diagnosis; Mutation Confirmation; Pre-symptomatic
Clinical utility: Help
Establish or confirm diagnosis
View citations (1)
  • The hereditary amyloidoses. Benson MD, et al. Best Pract Res Clin Rheumatol. 2003;17(6):909-27. doi:10.1016/j.berh.2003.09.001. PMID: 15123043.

Guidance for management

Target population: Help
Adult individuals with clinical features of transthyretin-associated familial amyloidosis
View citations (1)
  • The hereditary amyloidoses. Benson MD, et al. Best Pract Res Clin Rheumatol. 2003;17(6):909-27. doi:10.1016/j.berh.2003.09.001. PMID: 15123043.
Variant Interpretation:
What is the protocol for interpreting a variation as a VUS? Help
All detected variants are evaluated according to the most recent American College of Medical Genetics and Genomics (ACMG) and Association for Molecular Pathology (AMP) recommendations. Variants are classified based on known, predicted, or possible pathogenicity and reported with interpretive comments detailing their potential or known significance.

Are family members with defined clinical status recruited to assess significance of VUS without charge? Help
Yes. Contact lab for details

Will the lab re-contact the ordering physician if variant interpretation changes? Help
No. The laboratory encourages health care providers to contact the laboratory at any time to learn how the status of a particular variant may have changed over time.
Research:
Is research allowed on the sample after clinical testing is complete? Help
Research testing is only performed under IRB approved protocol with an opt-out policy in place.
Recommended fields not provided:
Technical Information
Test Procedure: Help
Next-generation sequencing (NGS) and/or Sanger sequencing is performed to test for the presence of variants in coding regions and intron/exon boundaries of the gene analyzed. NGS and/or a polymerase chain reaction (PCR)-based quantitative method is performed to test for the presence of deletions and duplications in the gene analyzed
Test Confirmation: Help
Confirmation of select reportable variants may be performed by alternate methodologies based on internal laboratory criteria. PCR-based methods and/or Sanger sequencing is used to confirm variants detected by NGS when appropriate
Availability: Help
Tests performed
Entire test performed in-house
Analytical Validity: Help
At least 99% of the bases are covered at a read depth >30X. Sensitivity is estimated at >99% for single nucleotide variants, >94% for indels up to 39 base pairs, >95% for deletions up to 75 base pairs and insertions up to 47 base pairs.
Assay limitations: Help
Clinical Correlations: Test results should be interpreted in the context of clinical findings, family history, and other laboratory data. Misinterpretation of results may occur if the information provided is inaccurate or incomplete. If testing was performed because of a clinically significant family history, it is often useful to first test … View more
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
Variants may be analyzed using any combination of the following: Alamut, REVEL, Polyphen-2, SIFT, AGVGD, MutationTaster, SpliceSiteFinder-like, MaxEntScan, NNSPLICE, GeneSplicer, gene-specific online databases, ISCA, UCSC Genome Browser

Laboratory's policy on reporting novel variations Help
All novel variants and copy number variants are evaluated for potential pathogenicity and included in the written report, accordingly.
Recommended fields not provided:
Regulatory Approval
FDA Review: Help
Category: FDA exercises enforcement discretion
Additional Information

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 endorsements 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.