Muscle protein analysis in the detection of heterozygotes for recessive limb girdle muscular dystrophy type 2B and 2E

Marina Fanin, Anna Chiara Nascimbeni, Corrado Angelini

Research output: Contribution to journalArticlepeer-review

Abstract

The diagnosis of isolated heterozygotes for recessive LGMD is quite difficult because no specific biochemical or protein assays are available, and the molecular analysis is not feasible due to the wide genetic heterogeneity. We investigated a series of definite heterozygotes for different forms of LGMD to determine whether the carrier status will result in a detectable protein defect in muscle biopsy. Definite heterozygotes from 4 families (3 LGMD2B and 1 LGMD2E) underwent quantitative immunoblot analysis of mutant protein in their muscle. While the quantity of β-sarcoglycan was nearly normal in the LGMD2E carrier, the levels of dysferlin protein were reduced to 50% of controls in the carriers of LGMD2B. We have demonstrated the value of protein analysis in the identification of both familial and isolated LGMD2B heterozygotes, and suggested the use of dysferlin protein testing to select muscle biopsies from suspected carriers for a subsequent mutation analysis. Muscle protein analysis would be used to screen asymptomatic patients who underwent muscle biopsy because of unexplained hyperCKemia.

Original languageEnglish
Pages (from-to)792-799
Number of pages8
JournalNeuromuscular Disorders
Volume16
Issue number11
DOIs
Publication statusPublished - Nov 2006

Keywords

  • Dysferlin
  • Heterozygote diagnosis
  • LGMD
  • Limb girdle muscular dystrophy
  • Sarcoglycan

ASJC Scopus subject areas

  • Clinical Neurology
  • Pediatrics, Perinatology, and Child Health
  • Developmental Neuroscience
  • Neurology

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