Novel mutations in the adipose triglyceride lipase gene causing neutral lipid storage disease with myopathy

Filomena Campagna, Luisa Nanni, Fabiana Quagliarini, Elena Pennisi, Constantine Michailidis, Francesco Pierelli, Claudio Bruno, Carlo Casali, Salvatore DiMauro, Marcello Arca

Research output: Contribution to journalArticlepeer-review

Abstract

A subgroup of neutral lipid storage disease has been recently associated with myopathy (NLSDM) and attributed to mutations in the gene (PNPLA2) encoding an adipose triglyceride lipase involved in the degradation of intracellular triglycerides. Five NLSDM patients have been described thus far and we reported three additional patients. A 44-year old Iranian woman and two Italian brothers, aged 40 and 35, presented with exercise intolerance and proximal limb weakness, elevated CK levels, and Jordan's anomaly. Muscle biopsies showed marked neutral lipid accumulation in all patients. The 10 exons and the intron-exon junctions of the PNPLA2 gene were sequenced. Two novel homozygous mutations in exon 5 of PNPLA2 gene were found (c.695delT and c.542delAC). Both mutations resulted in frameshifts leading to premature stop codons (p.L255X and p.I212X, respectively). These mutations predict a truncated PNPLA2 protein lacking the C-terminal hydrophobic domain. These findings indicate that NLSDM is rare, but genetically heterogeneous.

Original languageEnglish
Pages (from-to)843-846
Number of pages4
JournalBiochemical and Biophysical Research Communications
Volume377
Issue number3
DOIs
Publication statusPublished - Dec 19 2008

Keywords

  • Chanarin-Dorfman syndrome
  • Lipid droplets
  • Neutral lipid storage disease
  • PNPLA2/ATGL
  • Triglyceride storage

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Cell Biology
  • Molecular Biology

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