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Novel Mutation (c.8725T>C) in Two Siblings With Late-Onset LAMA2-Related Muscular Dystrophy

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Dear Editor, LAMA2-related muscular dystrophy can be classified into two clinical phenotypes: severe early-onset congenital muscular dystrophy and mild late-onset muscular dystrophy [1]. Several mild form muscular dystrophy cases have been diagnosed since Tan et al [2] reported the first case of late-onset LAMA2-related muscular dystrophy, thus expanding the spectrum of this disease [3 -6]. Late-onset LAMA2-related muscular dystrophy presents clinically as limb girdle muscular dystrophy patterns and is associated with the partial expression of laminin α2 [6]. Here, we describe a novel missense mutation (c.8725T>C/p.Cys2909Arg) in the LAMA2 in a patient diagnosed as having late-onset LAMA2-related muscular dystrophy. This study was approved by the institutional research review board of the Catholic University of Korea, Incheon St. Mary’s Hospital. Written informed consent was obtained from the patient’s parents after they had been briefed about the study.

Abstract

Dear Editor, LAMA2-related muscular dystrophy can be classified into two clinical phenotypes: severe early-onset congenital muscular dystrophy and mild late-onset muscular dystrophy [1]. Several mild form muscular dystrophy cases have been diagnosed since Tan et al [2] reported the first case of late-onset LAMA2-related muscular dystrophy, thus expanding the spectrum of this disease [3 -6]. Late-onset LAMA2-related muscular dystrophy presents clinically as limb girdle muscular dystrophy patterns and is associated with the partial expression of laminin α2 [6]. Here, we describe a novel missense mutation (c.8725T>C/p.Cys2909Arg) in the LAMA2 in a patient diagnosed as having late-onset LAMA2-related muscular dystrophy. This study was approved by the institutional research review board of the Catholic University of Korea, Incheon St. Mary’s Hospital. Written informed consent was obtained from the patient’s parents after they had been briefed about the study.

참고문헌 (10)

  1. Quijano-Roy S, "Gene Reviews" (2017), University of Washington
  2. Tan E, "Late onset muscular dystrophy with cerebral white matter changes due to partial merosin deficiency", Neuromuscul Disord, 7, pp.85~89 (1997)
  3. Chan SH, "Limb girdle muscular dystrophy due to LAMA2 mutations: diagnostic difficulties due to associated peripheral neuropathy", Neuromuscul Disord, 24, pp.677~683 (2014)
  4. Ding J, "Clinical and molecular genetic analysis of a family with late-onset LAMA2-related muscular dystrophy", Brain Dev, 38, pp.242~249 (2016)
  5. Jones KJ, "The expanding phenotype of laminin alpha2 chain (merosin) abnormalities: case series and review", J Med Genet, 38, pp.649~657 (2001)
  6. Rajakulendran S, "Clinical and pathological heterogeneity in late-onset partial merosin deficiency", Muscle Nerve, 44, pp.590~593 (2011)
  7. 장미애, "Identification of a Novel De Novo Variant in the PAX3 Gene in Waardenburg Syndrome by Diagnostic Exome Sequencing: The First Molecular Diagnosis in Korea", Annals of Laboratory Medicine, 35(3), pp.362~365 (2015), 대한진단검사의학회
  8. Hayashi YK, "Massive muscle cell degeneration in the early stage of merosin-deficient congenital muscular dystrophy", Neuromuscul Disord, 11, pp.350~359 (2001)
  9. Pegoraro E, "Laminin alpha2 muscular dystrophy: genotype", phenotype studies of 22 patients, 1998, pp.51, 101~110
  10. Richards S, "Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology", Genet Med, 17, pp.405~424 (2015)

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