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Related Experiment Video

Updated: Nov 11, 2025

Functional Characterization of Endogenously Expressed Human RYR1 Variants
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Variant curation expert panel recommendations for RYR1 pathogenicity classifications in malignant hyperthermia

Jennifer J Johnston1, Robert T Dirksen2, Thierry Girard3

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Genetics in Medicine : Official Journal of the American College of Medical Genetics
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Summary

The ClinGen Expert Panel adapted ACMG/AMP criteria for RYR1 variants linked to malignant hyperthermia (MH). Quantitative calibration improved variant classification accuracy, aiding genetic testing results.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Bioinformatics

Background:

  • Malignant hyperthermia (MH) is a severe pharmacogenetic disorder.
  • RYR1 gene variants are a primary cause of autosomal dominant inherited MH.
  • Standardized variant classification is crucial for accurate genetic testing and patient management.

Purpose of the Study:

  • To adapt and refine the American College of Medical Genetics and Genomics (ACMG)/Association for Molecular Pathology (AMP) pathogenicity criteria for RYR1 variants associated with MH.
  • To develop a quantitative framework for variant classification using Bayesian methods and likelihood ratios.
  • To improve the accuracy and consistency of RYR1 variant interpretation in the context of MH.

Main Methods:

  • Specified and piloted ACMG/AMP criteria for RYR1 and MH variant classification on 84 variants.
  • Applied quantitative evidence calibration using likelihood ratios and the Bayesian framework.
  • Evaluated in silico (PP3, BP4) and hotspot (PM1) criteria using REVEL scores and odds ratios.

Main Results:

  • Seven ACMG/AMP criteria were adopted unchanged, nine were modified, and ten were dropped.
  • Quantitative evaluation showed significant odds ratios for PP3 (23:1) and PM1 (24:1) criteria.
  • Application of revised criteria to 44 known MH variants resulted in 29 pathogenic, 13 likely pathogenic, and 2 variants of uncertain significance classifications.

Conclusions:

  • The adapted ACMG/AMP criteria provide a robust framework for classifying RYR1 variants related to MH.
  • Quantitative calibration enhances the reliability of variant pathogenicity assessment.
  • This approach facilitates accurate interpretation of RYR1/MH genomic testing results and is generalizable to other expert panels.