Skeletal muscle involvement in biallelic SORD mutations: case report and review of the literature

Acta Myol. 2023 Dec 20;42(4):113-117. doi: 10.36185/2532-1900-323. eCollection 2023.

Abstract

Biallelic mutations in the sorbitol dehydrogenase (SORD) gene have been identified as a genetic cause of autosomal recessive axonal Charcot-Marie-Tooth disease 2 (CMT2) and distal hereditary motor neuropathy (dHMN). We herein review the main phenotypes associated with SORD mutations and report the case of a 16-year-old man who was referred to our outpatient clinic for a slowly worsening gait disorder with wasting and weakness of distal lower limbs musculature. Since creatine phosphokinase (CPK) values were persistently raised (1.5fold increased) and a Next-Generation Sequencing CMT-associated panel failed in identifying pathogenic variants, a muscle biopsy was performed with evidence of alterations suggestive of a protein surplus distal myopathy. Finally, Whole-Exome Sequencing (WES) identified two pathogenic SORD variants in the heterozygous state: c.458C > A (p.Ala153Asp) and c.757delG (p.Ala253Glnfs*27). This is an isolated report of compound heterozygosity for two SORD mutations associated with clinical and histological signs of skeletal muscle involvement, expanding the phenotypic expression of SORD mutations.

Keywords: SORD; Sorbitol Dehydrogenase; dHMN; myopathy.

Publication types

  • Review
  • Case Reports

MeSH terms

  • Adolescent
  • Charcot-Marie-Tooth Disease* / genetics
  • Humans
  • L-Iditol 2-Dehydrogenase* / genetics
  • Male
  • Muscle, Skeletal / pathology
  • Mutation
  • Pedigree
  • Phenotype

Substances

  • L-Iditol 2-Dehydrogenase