SMARCA2 mutation analysis
GTR Test Accession: Help GTR000500623.5
Last updated in GTR: 2018-11-15
Last annual review date for the lab: 2023-04-13 Past due LinkOut
At a Glance
Diagnosis; Mutation Confirmation; Pre-symptomatic; ...
Nicolaides-Baraitser syndrome
Genes (1): Help
SMARCA2 (9p24.3)
Molecular Genetics - Sequence analysis of select exons: Bi-directional Sanger Sequence Analysis
Patients suspected to this particular disease.
De novo mutations in the SMARCA2 gene are found in …
Not provided
Ordering Information
Offered by: Help
Amsterdam UMC Genome Diagnostics
View lab's website
View lab's test page
Test short name: Help
Specimen Source: Help
  • Amniocytes
  • Amniotic fluid
  • Buccal swab
  • Cell culture
  • Chorionic villi
  • Cord blood
  • Fetal blood
  • Fibroblasts
  • Fresh tissue
  • Frozen tissue
  • Isolated DNA
  • Peripheral (whole) blood
  • Saliva
  • View specimen requirements
Who can order: Help
  • Genetic Counselor
  • Health Care Provider
  • Licensed Physician
  • Physician Assistant
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
Using our website
Order URL
Test service: Help
Clinical Testing/Confirmation of Mutations Identified Previously
Confirmation of research findings
Test additional service: Help
Custom Prenatal Testing
Custom mutation-specific/Carrier testing
Test development: Help
Test developed by laboratory (no manufacturer test name)
Informed consent required: Help
Test strategy: Help
Simultaneous bi-directional sequencing of the relevant part of the SMARCA2 gene. Pathogenic mutations are clustered within sequences that encode ultraconserved motifs in the catalytic ATPase region of the protein.
Pre-test genetic counseling required: Help
Post-test genetic counseling required: Help
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
Total methods: 1
Method Category Help
Test method Help
Sequence analysis of select exons
Bi-directional Sanger Sequence Analysis
Applied Biosystems 3730 capillary sequencing instrument
Clinical Information
Test purpose: Help
Diagnosis; Mutation Confirmation; Pre-symptomatic; Prognostic; Risk Assessment; Screening
Clinical validity: Help
De novo mutations in the SMARCA2 gene are found in approximately 80% of Nicolaides Baraitser patients. All mutations identified to date are located in the catalytic ATPase region of the protein, encoded by exons 15 to 25.
Target population: Help
Patients suspected to this particular disease.
Variant Interpretation:
What is the protocol for interpreting a variation as a VUS? Help
The 5-classes classification method (Alamut)

Will the lab re-contact the ordering physician if variant interpretation changes? Help
Recommended fields not provided:
Technical Information
Test Procedure: Help
DNA is extracted from the patient specimen, PCR amplification and sequence analysis of the entire coding region/ or indicated exons plus additional flanking intronic or other non-coding sequence. Sanger sequencing is carried out and the sequence is visualized on a capillary sequencer. Sequencing is performed separately in both the forward … View more
Test Confirmation: Help
Confirmation of identified mutations is done in an independent experiment.
Availability: Help
Tests performed
Entire test performed in-house
Analytical Validity: Help
This test detects >90% of described mutations
Proficiency testing (PT):
Is proficiency testing performed for this test? Help

Method used for proficiency testing: Help
Formal PT program

PT Provider: Help
European Molecular Genetics Quality Network, EMQN

Description of PT method: Help
For Proficiency Testing, both external and internal, we have Sanger-sequenced extensive numbers of PCR fragments, and the error rate is less than 0.01% (99.99% accuracy). Technical specificity for methods used in our laboratory is estimated >99.5% and technical sensitivity >99.5%. Mutation detection reproducibility for Sanger sequencing is near to 100%.
Software used to interpret novel variations Help
Alamut (Interactive Biosoftware), including AGVGD, PolyPhen-2, SIFT and MutationTaster for missense predictions and MAXEntScan, NNSPLICE, GeneSplicer and Human Splicing Finder for splice predictions

Laboratory's policy on reporting novel variations Help
Our laboratory reports class 3 (unknown pathogenicity), class 4 (likely pathogenic) and class 5 (certainly pathogenic) variants.
Recommended fields not provided:
Regulatory Approval
FDA Review: Help
Category: Not Applicable
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.