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Related Experiment Video

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Characterization of Reference Materials for Spinal Muscular Atrophy Genetic Testing: A Genetic Testing Reference

Thomas W Prior1, Pinar Bayrak-Toydemir2, Ty C Lynnes3

  • 1Department of Pathology, Case Western Reserve University, University Hospitals, Cleveland, Ohio.

The Journal of Molecular Diagnostics : JMD
|November 16, 2020
PubMed
Summary

New reference materials for spinal muscular atrophy (SMA) testing are now available. These materials help clinical labs accurately measure SMN1 and SMN2 gene copies for diagnosing SMA and guiding treatment.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Clinical Diagnostics

Background:

  • Spinal muscular atrophy (SMA) is a genetic disorder caused by SMN1 gene loss, with SMN2 gene copy number influencing severity.
  • SMA is being considered for newborn screening, necessitating accurate genetic testing.
  • Reliable reference materials are crucial for consistent and accurate clinical laboratory testing of SMA.

Purpose of the Study:

  • To develop and characterize reference materials for SMN1 and SMN2 copy number analysis.
  • To support the accuracy and reliability of clinical genetic testing for spinal muscular atrophy.
  • To provide essential tools for newborn screening programs and therapeutic intervention identification.

Main Methods:

  • Characterization of 15 SMA reference materials with varying SMN1 and SMN2 copy numbers.
  • Distribution of DNA samples to four volunteer laboratories for genotyping.
  • Validation of genotyping using three distinct analytical methods.

Main Results:

  • Reference materials encompass SMN1 copy numbers from zero to four and SMN2 from zero to five.
  • Samples include clinically significant allele combinations and markers for SMA carriers.
  • Genotyping results across laboratories and methods demonstrated consistency.

Conclusions:

  • The characterized SMA reference materials are vital for ensuring the quality of clinical laboratory testing.
  • These materials will aid in accurate diagnosis, carrier screening, and identification of individuals eligible for SMA therapies.
  • Availability of these reference materials from Coriell Institute supports standardization in SMA diagnostics.