High frequency of ETFDH c.250G>A mutation in Taiwanese patients with late-onset lipid storage myopathy

M. Y. Lan, M. H. Fu, Y. F. Liu, C. C. Huang, Y. Y. Chang, J. S. Liu, C. H. Peng, S. S. Chen*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

57 Scopus citations

Abstract

Lan M-Y, Fu M-H, Liu Y-F, Huang C-C, Chang Y-Y, Liu J-S, Peng C-H, Chen S-S. High frequency of ETFDH c.250G>A mutation in Taiwanese patients with late-onset lipid storage myopathy.Lipid storage myopathies (LSMs) are characterized pathologically by the accumulation of lipid droplets in muscle fibers due to impaired cellular lipid metabolism. The purpose of this study was to determine etiologies and genetic mutations associated with LSMs in ethnic Han Taiwanese. The usefulness of the blood acylcarnitine (AC) profile for diagnosing LSMs in adult patients was also investigated. Nine patients were diagnosed with late-onset LSMs following a review of muscle biopsies and medical records and were recruited retrospectively. Genetic studies were performed to detect mutations in the SLC22A5 for primary carnitine deficiency, PNPLA2 for neutral lipid storage disease with myopathy, ABHD5 for neutral lipid storage disease with ichthyosis, ETFDH for multiple acyl-CoA dehydrogenation deficiency (MADD), and CPT2 for carnitine palmitoyltransferase II deficiency. Blood AC levels were measured by tandem mass spectrometry. The mutation c.250G>A in ETFDH was detected in seven (78%) patients, six of whom were homozygous for the variant. Patients with ETFDH mutations had elevated blood levels of ACs ranging from C8 to C16 species, a pattern consistent with MADD. ETFDH c.250G>A mutation is common in Taiwanese patients with late-onset LSMs. The blood AC profile is a sensitive biochemical marker for diagnosing MADD arising from ETFDH mutations in adults.

Original languageEnglish
Pages (from-to)565-569
Number of pages5
JournalClinical Genetics
Volume78
Issue number6
DOIs
StatePublished - 12 2010

Keywords

  • Acylcarnitine
  • ETFDH
  • Lipid storage myopathy
  • Multiple acyl-CoA dehydrogenation deficiency
  • Tandem mass spectrometry

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