Open Access

Molecular diagnosis of McArdle disease using whole-exome sequencing

  • Authors:
    • Ju-Hyung Kang
    • Jun-Hyung Park
    • Jin-Soon Park
    • Seong-Kyu Lee
    • Sunghoon Lee
    • Haing-Woon Baik
  • View Affiliations

  • Published online on: July 18, 2021     https://doi.org/10.3892/etm.2021.10461
  • Article Number: 1029
  • Copyright: © Kang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Whole-exome sequencing (WES) analysis has been used recently as a diagnostic tool for finding molecular defects. In the present study, researchers attempted to analyze molecular defects through WES in a 13-year-old female patient who had not been diagnosed through a conventional genetic approach. DNA was extracted and subjected to WES analysis to identify the genetic defect. A total of 106,728 exons and splicing variants were selected, and synonymous single nucleotide variants (SNVs) and general single nucleotide polymorphisms (SNPs) were filtered out. Finally, nonsynonymous SNVs (c.C415T and c.C389T) of the PYGM gene were identified in nine compound heterozygous mutations. PYGM encodes myophosphorylase and degrades glycogen in the muscle to supply energy to muscle cells. The present study revealed that the patient's father had a c.C389T mutation and the mother had a c.C415T mutation, resulting in A130V and R139W missense mutations, respectively. To the best of our knowledge, the A130V variant in PYGM has not been reported in the common variant databases. All variations of the patient's family detected using WES were verified by Sanger sequencing. Because the patient had compound heterozygous mutations in the PYGM gene, the patient was presumed to exhibit markedly decreased muscle phosphorylase activity. To assess the function of myophosphorylase, an ischemic forearm exercise test was performed. The blood ammonia level sharply increased and the lactate level maintained a flat curve shape similar to the typical pattern of McArdle disease. Therefore, the diagnosis of the patient was confirmed to be McArdle disease, a glycogen storage disease. Through WES analysis, accurate and early diagnosis could be made in the present study. This report describes a novel compound heterozygous mutation of the PYGM gene in a Korean patient.

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September-2021
Volume 22 Issue 3

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Spandidos Publications style
Kang J, Park J, Park J, Lee S, Lee S and Baik H: Molecular diagnosis of McArdle disease using whole-exome sequencing. Exp Ther Med 22: 1029, 2021
APA
Kang, J., Park, J., Park, J., Lee, S., Lee, S., & Baik, H. (2021). Molecular diagnosis of McArdle disease using whole-exome sequencing. Experimental and Therapeutic Medicine, 22, 1029. https://doi.org/10.3892/etm.2021.10461
MLA
Kang, J., Park, J., Park, J., Lee, S., Lee, S., Baik, H."Molecular diagnosis of McArdle disease using whole-exome sequencing". Experimental and Therapeutic Medicine 22.3 (2021): 1029.
Chicago
Kang, J., Park, J., Park, J., Lee, S., Lee, S., Baik, H."Molecular diagnosis of McArdle disease using whole-exome sequencing". Experimental and Therapeutic Medicine 22, no. 3 (2021): 1029. https://doi.org/10.3892/etm.2021.10461